diff --git a/.editorconfig b/.editorconfig
index a14dd7a516..149415d127 100644
--- a/.editorconfig
+++ b/.editorconfig
@@ -6,4 +6,4 @@ end_of_line=lf
 charset=utf-8
 trim_trailing_whitespace=true
 max_line_length=100
-insert_final_newline=false
+insert_final_newline=true
\ No newline at end of file
diff --git a/.github/workflows/book.yml b/.github/workflows/book.yml
index 598754368e..db458a3dbf 100644
--- a/.github/workflows/book.yml
+++ b/.github/workflows/book.yml
@@ -5,6 +5,10 @@ on:
     branches:
       - unstable
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 jobs:
   build-and-upload-to-s3:
     runs-on: ubuntu-20.04
diff --git a/.github/workflows/cancel-previous-runs.yml b/.github/workflows/cancel-previous-runs.yml
deleted file mode 100644
index 2eaefa40ca..0000000000
--- a/.github/workflows/cancel-previous-runs.yml
+++ /dev/null
@@ -1,14 +0,0 @@
-name: cancel previous runs
-on: [push]
-jobs:
-  cancel:
-    name: 'Cancel Previous Runs'
-    runs-on: ubuntu-latest
-    timeout-minutes: 3
-    steps:
-      # https://github.com/styfle/cancel-workflow-action/releases
-      - uses: styfle/cancel-workflow-action@514c783324374c6940d1b92bfb962d0763d22de3 # 0.7.0
-        with:
-          # https://api.github.com/repos/sigp/lighthouse/actions/workflows
-          workflow_id: 697364,2434944,4462424,308241,2883401,316
-          access_token: ${{ github.token }}
diff --git a/.github/workflows/docker-antithesis.yml b/.github/workflows/docker-antithesis.yml
deleted file mode 100644
index 84f5541a3c..0000000000
--- a/.github/workflows/docker-antithesis.yml
+++ /dev/null
@@ -1,31 +0,0 @@
-name: docker antithesis
-
-on:
-    push:
-        branches:
-            - unstable
-
-env:
-    ANTITHESIS_PASSWORD: ${{ secrets.ANTITHESIS_PASSWORD }}
-    ANTITHESIS_USERNAME: ${{ secrets.ANTITHESIS_USERNAME }}
-    ANTITHESIS_SERVER: ${{ secrets.ANTITHESIS_SERVER }}
-    REPOSITORY: ${{ secrets.ANTITHESIS_REPOSITORY }}
-    IMAGE_NAME: lighthouse
-    TAG: libvoidstar
-
-jobs:
-    build-docker:
-        runs-on: ubuntu-22.04
-        steps:
-            - uses: actions/checkout@v3
-            - name: Update Rust
-              run: rustup update stable
-            - name: Dockerhub login
-              run: |
-                  echo "${ANTITHESIS_PASSWORD}" | docker login --username ${ANTITHESIS_USERNAME} https://${ANTITHESIS_SERVER} --password-stdin
-            - name: Build AMD64 dockerfile (with push)
-              run: |
-                  docker build \
-                      --tag ${ANTITHESIS_SERVER}/${REPOSITORY}/${IMAGE_NAME}:${TAG} \
-                      --file ./testing/antithesis/Dockerfile.libvoidstar .
-                  docker push ${ANTITHESIS_SERVER}/${REPOSITORY}/${IMAGE_NAME}:${TAG}
diff --git a/.github/workflows/docker.yml b/.github/workflows/docker.yml
index c3119db378..21ca4940d9 100644
--- a/.github/workflows/docker.yml
+++ b/.github/workflows/docker.yml
@@ -8,6 +8,10 @@ on:
         tags:
             - v*
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 env:
     DOCKER_PASSWORD: ${{ secrets.DOCKER_PASSWORD }}
     DOCKER_USERNAME: ${{ secrets.DOCKER_USERNAME }}
diff --git a/.github/workflows/linkcheck.yml b/.github/workflows/linkcheck.yml
index 8428c0a3b0..19236691f6 100644
--- a/.github/workflows/linkcheck.yml
+++ b/.github/workflows/linkcheck.yml
@@ -9,6 +9,10 @@ on:
       - 'book/**'
   merge_group:
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 jobs:
   linkcheck:
     name: Check broken links
diff --git a/.github/workflows/local-testnet.yml b/.github/workflows/local-testnet.yml
index 9223c40e15..1269aee627 100644
--- a/.github/workflows/local-testnet.yml
+++ b/.github/workflows/local-testnet.yml
@@ -8,6 +8,10 @@ on:
   pull_request:
   merge_group:
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 jobs:
   run-local-testnet:
     strategy:
@@ -21,10 +25,6 @@ jobs:
 
       - name: Get latest version of stable Rust
         run: rustup update stable
-      - name: Install Protoc
-        uses: arduino/setup-protoc@e52d9eb8f7b63115df1ac544a1376fdbf5a39612
-        with:
-            repo-token: ${{ secrets.GITHUB_TOKEN }}
       - name: Install geth (ubuntu)
         if: matrix.os == 'ubuntu-22.04'
         run: |
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 8142184415..e38b03daf7 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -5,6 +5,10 @@ on:
         tags:
             - v*
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 env:
     DOCKER_PASSWORD: ${{ secrets.DOCKER_PASSWORD }}
     DOCKER_USERNAME: ${{ secrets.DOCKER_USERNAME }}
@@ -79,15 +83,6 @@ jobs:
               if: startsWith(matrix.arch, 'x86_64-windows')
               run: echo "LIBCLANG_PATH=$((gcm clang).source -replace "clang.exe")" >> $env:GITHUB_ENV
 
-            # ==============================
-            # Windows & Mac dependencies
-            # ==============================
-            - name: Install Protoc
-              if: contains(matrix.arch, 'darwin') || contains(matrix.arch, 'windows')
-              uses: arduino/setup-protoc@e52d9eb8f7b63115df1ac544a1376fdbf5a39612
-              with:
-                repo-token: ${{ secrets.GITHUB_TOKEN }}
-
             # ==============================
             #       Builds
             # ==============================
diff --git a/.github/workflows/test-suite.yml b/.github/workflows/test-suite.yml
index da22176d20..3705f548b5 100644
--- a/.github/workflows/test-suite.yml
+++ b/.github/workflows/test-suite.yml
@@ -9,6 +9,11 @@ on:
       - 'pr/*'
   pull_request:
   merge_group:
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 env:
   # Deny warnings in CI
   # Disable debug info (see https://github.com/sigp/lighthouse/issues/4005)
@@ -17,6 +22,10 @@ env:
   PINNED_NIGHTLY: nightly-2023-04-16
   # Prevent Github API rate limiting.
   LIGHTHOUSE_GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+  # Enable self-hosted runners for the sigp repo only.
+  SELF_HOSTED_RUNNERS: ${{ github.repository == 'sigp/lighthouse' }}
+  # Self-hosted runners need to reference a different host for `./watch` tests.
+  WATCH_HOST: ${{ github.repository == 'sigp/lighthouse' && 'host.docker.internal' || 'localhost' }}
 jobs:
   target-branch-check:
     name: target-branch-check
@@ -48,27 +57,28 @@ jobs:
       run: make cargo-fmt
   release-tests-ubuntu:
     name: release-tests-ubuntu
-    runs-on: ubuntu-latest
+    # Use self-hosted runners only on the sigp repo.
+    runs-on: ${{ github.repository == 'sigp/lighthouse' && fromJson('["self-hosted", "linux", "large"]') || 'ubuntu-latest'  }}
     needs: cargo-fmt
     steps:
     - uses: actions/checkout@v3
     - name: Get latest version of stable Rust
+      if: env.SELF_HOSTED_RUNNERS == false
       run: rustup update stable
-    - name: Install Protoc
-      uses: arduino/setup-protoc@e52d9eb8f7b63115df1ac544a1376fdbf5a39612
+    - name: Install Foundry (anvil)
+      uses: foundry-rs/foundry-toolchain@v1
       with:
-        repo-token: ${{ secrets.GITHUB_TOKEN }}
-    - name: Install anvil
-      run: cargo install --git https://github.com/foundry-rs/foundry --locked anvil
+        version: nightly-ca67d15f4abd46394b324c50e21e66f306a1162d
     - name: Run tests in release
       run: make test-release
   release-tests-windows:
     name: release-tests-windows
-    runs-on: windows-2019
+    runs-on: ${{ github.repository == 'sigp/lighthouse' && fromJson('["self-hosted", "windows"]') || 'windows-2019'  }}
     needs: cargo-fmt
     steps:
     - uses: actions/checkout@v3
     - name: Get latest version of stable Rust
+      if: env.SELF_HOSTED_RUNNERS == false
       run: rustup update stable
     - name: Use Node.js
       uses: actions/setup-node@v2
@@ -76,14 +86,16 @@ jobs:
         node-version: '14'
     - name: Install windows build tools
       run: |
-        choco install python protoc visualstudio2019-workload-vctools -y
+        choco install python visualstudio2019-workload-vctools -y
         npm config set msvs_version 2019
-    - name: Install anvil
-      # Extra feature to work around https://github.com/foundry-rs/foundry/issues/5115
-      run: cargo install --git https://github.com/foundry-rs/foundry --locked anvil --features ethers/ipc
+    - name: Install Foundry (anvil)
+      uses: foundry-rs/foundry-toolchain@v1
+      with:
+        version: nightly-ca67d15f4abd46394b324c50e21e66f306a1162d
     - name: Install make
       run: choco install -y make
     - uses: KyleMayes/install-llvm-action@v1
+      if: env.SELF_HOSTED_RUNNERS == false
       with:
         version: "15.0"
         directory: ${{ runner.temp }}/llvm
@@ -93,16 +105,14 @@ jobs:
       run: make test-release
   beacon-chain-tests:
     name: beacon-chain-tests
-    runs-on: ubuntu-latest
+    # Use self-hosted runners only on the sigp repo.
+    runs-on: ${{ github.repository == 'sigp/lighthouse' && fromJson('["self-hosted", "linux", "large"]') || 'ubuntu-latest'  }}
     needs: cargo-fmt
     steps:
     - uses: actions/checkout@v3
     - name: Get latest version of stable Rust
+      if: env.SELF_HOSTED_RUNNERS == false
       run: rustup update stable
-    - name: Install Protoc
-      uses: arduino/setup-protoc@e52d9eb8f7b63115df1ac544a1376fdbf5a39612
-      with:
-        repo-token: ${{ secrets.GITHUB_TOKEN }}
     - name: Run beacon_chain tests for all known forks
       run: make test-beacon-chain
   op-pool-tests:
@@ -113,10 +123,6 @@ jobs:
     - uses: actions/checkout@v3
     - name: Get latest version of stable Rust
       run: rustup update stable
-    - name: Install Protoc
-      uses: arduino/setup-protoc@e52d9eb8f7b63115df1ac544a1376fdbf5a39612
-      with:
-        repo-token: ${{ secrets.GITHUB_TOKEN }}
     - name: Run operation_pool tests for all known forks
       run: make test-op-pool
   slasher-tests:
@@ -131,18 +137,18 @@ jobs:
       run: make test-slasher
   debug-tests-ubuntu:
     name: debug-tests-ubuntu
-    runs-on: ubuntu-22.04
+    # Use self-hosted runners only on the sigp repo.
+    runs-on: ${{ github.repository == 'sigp/lighthouse' && fromJson('["self-hosted", "linux", "large"]') || 'ubuntu-latest'  }}
     needs: cargo-fmt
     steps:
     - uses: actions/checkout@v3
     - name: Get latest version of stable Rust
+      if: env.SELF_HOSTED_RUNNERS == false
       run: rustup update stable
-    - name: Install Protoc
-      uses: arduino/setup-protoc@e52d9eb8f7b63115df1ac544a1376fdbf5a39612
+    - name: Install Foundry (anvil)
+      uses: foundry-rs/foundry-toolchain@v1
       with:
-        repo-token: ${{ secrets.GITHUB_TOKEN }}
-    - name: Install anvil
-      run: cargo install --git https://github.com/foundry-rs/foundry --locked anvil
+        version: nightly-ca67d15f4abd46394b324c50e21e66f306a1162d
     - name: Run tests in debug
       run: make test-debug
   state-transition-vectors-ubuntu:
@@ -153,24 +159,18 @@ jobs:
     - uses: actions/checkout@v3
     - name: Get latest version of stable Rust
       run: rustup update stable
-    - name: Install Protoc
-      uses: arduino/setup-protoc@e52d9eb8f7b63115df1ac544a1376fdbf5a39612
-      with:
-        repo-token: ${{ secrets.GITHUB_TOKEN }}
     - name: Run state_transition_vectors in release.
       run: make run-state-transition-tests
   ef-tests-ubuntu:
     name: ef-tests-ubuntu
-    runs-on: ubuntu-latest
+    # Use self-hosted runners only on the sigp repo.
+    runs-on: ${{ github.repository == 'sigp/lighthouse' && fromJson('["self-hosted", "linux", "small"]') || 'ubuntu-latest'  }}
     needs: cargo-fmt
     steps:
     - uses: actions/checkout@v3
     - name: Get latest version of stable Rust
+      if: env.SELF_HOSTED_RUNNERS == false
       run: rustup update stable
-    - name: Install Protoc
-      uses: arduino/setup-protoc@e52d9eb8f7b63115df1ac544a1376fdbf5a39612
-      with:
-        repo-token: ${{ secrets.GITHUB_TOKEN }}
     - name: Run consensus-spec-tests with blst, milagro and fake_crypto
       run: make test-ef
   dockerfile-ubuntu:
@@ -193,12 +193,10 @@ jobs:
     - uses: actions/checkout@v3
     - name: Get latest version of stable Rust
       run: rustup update stable
-    - name: Install Protoc
-      uses: arduino/setup-protoc@e52d9eb8f7b63115df1ac544a1376fdbf5a39612
+    - name: Install Foundry (anvil)
+      uses: foundry-rs/foundry-toolchain@v1
       with:
-        repo-token: ${{ secrets.GITHUB_TOKEN }}
-    - name: Install anvil
-      run: cargo install --git https://github.com/foundry-rs/foundry --locked anvil
+        version: nightly-ca67d15f4abd46394b324c50e21e66f306a1162d
     - name: Run the beacon chain sim that starts from an eth1 contract
       run: cargo run --release --bin simulator eth1-sim
   merge-transition-ubuntu:
@@ -209,12 +207,10 @@ jobs:
     - uses: actions/checkout@v3
     - name: Get latest version of stable Rust
       run: rustup update stable
-    - name: Install Protoc
-      uses: arduino/setup-protoc@e52d9eb8f7b63115df1ac544a1376fdbf5a39612
+    - name: Install Foundry (anvil)
+      uses: foundry-rs/foundry-toolchain@v1
       with:
-        repo-token: ${{ secrets.GITHUB_TOKEN }}
-    - name: Install anvil
-      run: cargo install --git https://github.com/foundry-rs/foundry --locked anvil
+        version: nightly-ca67d15f4abd46394b324c50e21e66f306a1162d
     - name: Run the beacon chain sim and go through the merge transition
       run: cargo run --release --bin simulator eth1-sim --post-merge
   no-eth1-simulator-ubuntu:
@@ -225,10 +221,6 @@ jobs:
     - uses: actions/checkout@v3
     - name: Get latest version of stable Rust
       run: rustup update stable
-    - name: Install Protoc
-      uses: arduino/setup-protoc@e52d9eb8f7b63115df1ac544a1376fdbf5a39612
-      with:
-        repo-token: ${{ secrets.GITHUB_TOKEN }}
     - name: Run the beacon chain sim without an eth1 connection
       run: cargo run --release --bin simulator no-eth1-sim
   syncing-simulator-ubuntu:
@@ -239,12 +231,10 @@ jobs:
     - uses: actions/checkout@v3
     - name: Get latest version of stable Rust
       run: rustup update stable
-    - name: Install Protoc
-      uses: arduino/setup-protoc@e52d9eb8f7b63115df1ac544a1376fdbf5a39612
+    - name: Install Foundry (anvil)
+      uses: foundry-rs/foundry-toolchain@v1
       with:
-        repo-token: ${{ secrets.GITHUB_TOKEN }}
-    - name: Install anvil
-      run: cargo install --git https://github.com/foundry-rs/foundry --locked anvil
+        version: nightly-ca67d15f4abd46394b324c50e21e66f306a1162d
     - name: Run the syncing simulator
       run: cargo run --release --bin simulator syncing-sim
   doppelganger-protection-test:
@@ -255,10 +245,6 @@ jobs:
     - uses: actions/checkout@v3
     - name: Get latest version of stable Rust
       run: rustup update stable
-    - name: Install Protoc
-      uses: arduino/setup-protoc@e52d9eb8f7b63115df1ac544a1376fdbf5a39612
-      with:
-        repo-token: ${{ secrets.GITHUB_TOKEN }}
     - name: Install geth
       run: |
           sudo add-apt-repository -y ppa:ethereum/ethereum
@@ -290,10 +276,6 @@ jobs:
         dotnet-version: '6.0.201'
     - name: Get latest version of stable Rust
       run: rustup update stable
-    - name: Install Protoc
-      uses: arduino/setup-protoc@e52d9eb8f7b63115df1ac544a1376fdbf5a39612
-      with:
-        repo-token: ${{ secrets.GITHUB_TOKEN }}
     - name: Run exec engine integration tests in release
       run: make test-exec-engine
   check-benchmarks:
@@ -304,10 +286,6 @@ jobs:
     - uses: actions/checkout@v3
     - name: Get latest version of stable Rust
       run: rustup update stable
-    - name: Install Protoc
-      uses: arduino/setup-protoc@e52d9eb8f7b63115df1ac544a1376fdbf5a39612
-      with:
-        repo-token: ${{ secrets.GITHUB_TOKEN }}
     - name: Typecheck benchmark code without running it
       run: make check-benches
   clippy:
@@ -318,10 +296,6 @@ jobs:
     - uses: actions/checkout@v3
     - name: Get latest version of stable Rust
       run: rustup update stable
-    - name: Install Protoc
-      uses: arduino/setup-protoc@e52d9eb8f7b63115df1ac544a1376fdbf5a39612
-      with:
-        repo-token: ${{ secrets.GITHUB_TOKEN }}
     - name: Lint code for quality and style with Clippy
       run: make lint
     - name: Certify Cargo.lock freshness
@@ -334,10 +308,6 @@ jobs:
     - uses: actions/checkout@v3
     - name: Install Rust @ MSRV (${{ needs.extract-msrv.outputs.MSRV }})
       run: rustup override set ${{ needs.extract-msrv.outputs.MSRV }}
-    - name: Install Protoc
-      uses: arduino/setup-protoc@e52d9eb8f7b63115df1ac544a1376fdbf5a39612
-      with:
-        repo-token: ${{ secrets.GITHUB_TOKEN }}
     - name: Run cargo check
       run: cargo check --workspace
   arbitrary-check:
@@ -376,10 +346,6 @@ jobs:
     - uses: actions/checkout@v3
     - name: Install Rust (${{ env.PINNED_NIGHTLY }})
       run: rustup toolchain install $PINNED_NIGHTLY
-    - name: Install Protoc
-      uses: arduino/setup-protoc@e52d9eb8f7b63115df1ac544a1376fdbf5a39612
-      with:
-        repo-token: ${{ secrets.GITHUB_TOKEN }}
     - name: Install cargo-udeps
       run: cargo install cargo-udeps --locked --force
     - name: Create Cargo config dir
@@ -397,7 +363,7 @@ jobs:
     steps:
     - uses: actions/checkout@v3
     - name: Install dependencies
-      run: sudo apt install -y git gcc g++ make cmake pkg-config llvm-dev libclang-dev clang protobuf-compiler
+      run: sudo apt install -y git gcc g++ make cmake pkg-config llvm-dev libclang-dev clang
     - name: Use Rust beta
       run: rustup override set beta
     - name: Run make
diff --git a/Cargo.lock b/Cargo.lock
index e360bdd62e..ad7b6fe14c 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -30,7 +30,10 @@ dependencies = [
  "filesystem",
  "safe_arith",
  "sensitive_url",
+ "serde",
+ "serde_json",
  "slashing_protection",
+ "slog",
  "slot_clock",
  "tempfile",
  "tokio",
@@ -60,9 +63,9 @@ dependencies = [
 
 [[package]]
 name = "addr2line"
-version = "0.19.0"
+version = "0.20.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a76fd60b23679b7d19bd066031410fb7e458ccc5e958eb5c325888ce4baedc97"
+checksum = "f4fa78e18c64fce05e902adecd7a5eed15a5e0a3439f7b0e169f0252214865e3"
 dependencies = [
  "gimli",
 ]
@@ -79,15 +82,6 @@ version = "1.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "aae1277d39aeec15cb388266ecc24b11c80469deae6067e17a1a7aa9e5c1f234"
 
-[[package]]
-name = "aead"
-version = "0.3.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7fc95d1bdb8e6666b2b217308eeeb09f2d6728d104be3e31916cc74d15420331"
-dependencies = [
- "generic-array",
-]
-
 [[package]]
 name = "aead"
 version = "0.4.3"
@@ -95,28 +89,6 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0b613b8e1e3cf911a086f53f03bf286f52fd7a7258e4fa606f0ef220d39d8877"
 dependencies = [
  "generic-array",
- "rand_core 0.6.4",
-]
-
-[[package]]
-name = "aead"
-version = "0.5.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d122413f284cf2d62fb1b7db97e02edb8cda96d769b16e443a4f6195e35662b0"
-dependencies = [
- "crypto-common",
- "generic-array",
-]
-
-[[package]]
-name = "aes"
-version = "0.6.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "884391ef1066acaa41e766ba8f596341b96e93ce34f9a43e7d24bf0a0eaf0561"
-dependencies = [
- "aes-soft",
- "aesni",
- "cipher 0.2.5",
 ]
 
 [[package]]
@@ -128,15 +100,15 @@ dependencies = [
  "cfg-if",
  "cipher 0.3.0",
  "cpufeatures",
- "ctr 0.8.0",
+ "ctr",
  "opaque-debug",
 ]
 
 [[package]]
 name = "aes"
-version = "0.8.2"
+version = "0.8.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "433cfd6710c9986c576a25ca913c39d66a6474107b406f34f91d4a8923395241"
+checksum = "ac1f845298e95f983ff1944b728ae08b8cebab80d684f0a832ed0fc74dfa27e2"
 dependencies = [
  "cfg-if",
  "cipher 0.4.4",
@@ -149,55 +121,21 @@ version = "0.9.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "df5f85a83a7d8b0442b6aa7b504b8212c1733da07b98aae43d4bc21b2cb3cdf6"
 dependencies = [
- "aead 0.4.3",
+ "aead",
  "aes 0.7.5",
  "cipher 0.3.0",
- "ctr 0.8.0",
- "ghash 0.4.4",
+ "ctr",
+ "ghash",
  "subtle",
 ]
 
-[[package]]
-name = "aes-gcm"
-version = "0.10.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "209b47e8954a928e1d72e86eca7000ebb6655fe1436d33eefc2201cad027e237"
-dependencies = [
- "aead 0.5.2",
- "aes 0.8.2",
- "cipher 0.4.4",
- "ctr 0.9.2",
- "ghash 0.5.0",
- "subtle",
-]
-
-[[package]]
-name = "aes-soft"
-version = "0.6.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "be14c7498ea50828a38d0e24a765ed2effe92a705885b57d029cd67d45744072"
-dependencies = [
- "cipher 0.2.5",
- "opaque-debug",
-]
-
-[[package]]
-name = "aesni"
-version = "0.10.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ea2e11f5e94c2f7d386164cc2aa1f97823fed6f259e486940a71c174dd01b0ce"
-dependencies = [
- "cipher 0.2.5",
- "opaque-debug",
-]
-
 [[package]]
 name = "ahash"
 version = "0.7.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "fcb51a0695d8f838b1ee009b3fbf66bda078cd64590202a864a8f3e8c4315c47"
 dependencies = [
- "getrandom 0.2.9",
+ "getrandom 0.2.10",
  "once_cell",
  "version_check",
 ]
@@ -215,18 +153,30 @@ dependencies = [
 
 [[package]]
 name = "aho-corasick"
-version = "1.0.1"
+version = "1.0.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "67fc08ce920c31afb70f013dcce1bfc3a3195de6a228474e45e1f145b36f8d04"
+checksum = "6748e8def348ed4d14996fa801f4122cd763fff530258cdc03f64b25f89d3a5a"
 dependencies = [
  "memchr",
 ]
 
+[[package]]
+name = "allocator-api2"
+version = "0.2.16"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0942ffc6dcaadf03badf6e6a2d0228460359d5e34b57ccdc720b7382dfbd5ec5"
+
 [[package]]
 name = "amcl"
 version = "0.3.0"
 source = "git+https://github.com/sigp/milagro_bls?tag=v1.4.2#16655aa033175a90c10ef02aa144e2835de23aec"
 
+[[package]]
+name = "android-tzdata"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e999941b234f3131b00bc13c22d06e8c5ff726d1b6318ac7eb276997bbb4fef0"
+
 [[package]]
 name = "android_system_properties"
 version = "0.1.5"
@@ -245,16 +195,26 @@ dependencies = [
  "winapi",
 ]
 
+[[package]]
+name = "anvil-rpc"
+version = "0.1.0"
+source = "git+https://github.com/foundry-rs/foundry?rev=b45456717ffae1af65acdc71099f8cb95e6683a0#b45456717ffae1af65acdc71099f8cb95e6683a0"
+dependencies = [
+ "serde",
+ "serde_json",
+]
+
 [[package]]
 name = "anyhow"
-version = "1.0.71"
+version = "1.0.75"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9c7d0618f0e0b7e8ff11427422b64564d5fb0be1940354bfe2e0529b18a9d9b8"
+checksum = "a4668cab20f66d8d020e1fbc0ebe47217433c1b6c8f2040faf858554e394ace6"
 
 [[package]]
 name = "arbitrary"
 version = "1.3.0"
-source = "git+https://github.com/michaelsproul/arbitrary?rev=f002b99989b561ddce62e4cf2887b0f8860ae991#f002b99989b561ddce62e4cf2887b0f8860ae991"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e2d098ff73c1ca148721f37baad5ea6a465a13f9573aba8641fbbbae8164a54e"
 dependencies = [
  "derive_arbitrary",
 ]
@@ -265,6 +225,15 @@ version = "1.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "bddcadddf5e9015d310179a59bb28c4d4b9920ad0f11e8e14dbadf654890c9a6"
 
+[[package]]
+name = "array-init"
+version = "0.0.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "23589ecb866b460d3a0f1278834750268c607e8e28a1b982c907219f3178cd72"
+dependencies = [
+ "nodrop",
+]
+
 [[package]]
 name = "arrayref"
 version = "0.3.7"
@@ -273,25 +242,9 @@ checksum = "6b4930d2cb77ce62f89ee5d5289b4ac049559b1c45539271f5ed4fdc7db34545"
 
 [[package]]
 name = "arrayvec"
-version = "0.7.2"
+version = "0.7.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8da52d66c7071e2e3fa2a1e5c6d088fec47b593032b254f5e980de8ea54454d6"
-
-[[package]]
-name = "asn1-rs"
-version = "0.3.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "30ff05a702273012438132f449575dbc804e27b2f3cbe3069aa237d26c98fa33"
-dependencies = [
- "asn1-rs-derive 0.1.0",
- "asn1-rs-impl",
- "displaydoc",
- "nom 7.1.3",
- "num-traits",
- "rusticata-macros",
- "thiserror",
- "time 0.3.21",
-]
+checksum = "96d30a06541fbafbc7f82ed10c06164cfbd2c401138f6addd8404629c4b16711"
 
 [[package]]
 name = "asn1-rs"
@@ -299,26 +252,14 @@ version = "0.5.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7f6fd5ddaf0351dff5b8da21b2fb4ff8e08ddd02857f0bf69c47639106c0fff0"
 dependencies = [
- "asn1-rs-derive 0.4.0",
+ "asn1-rs-derive",
  "asn1-rs-impl",
  "displaydoc",
- "nom 7.1.3",
+ "nom",
  "num-traits",
  "rusticata-macros",
  "thiserror",
- "time 0.3.21",
-]
-
-[[package]]
-name = "asn1-rs-derive"
-version = "0.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "db8b7511298d5b7784b40b092d9e9dcd3a627a5707e4b5e507931ab0d44eeebf"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn 1.0.109",
- "synstructure",
+ "time",
 ]
 
 [[package]]
@@ -364,7 +305,7 @@ dependencies = [
  "log",
  "parking",
  "polling",
- "rustix",
+ "rustix 0.37.23",
  "slab",
  "socket2 0.4.9",
  "waker-fn",
@@ -372,9 +313,9 @@ dependencies = [
 
 [[package]]
 name = "async-lock"
-version = "2.7.0"
+version = "2.8.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fa24f727524730b077666307f2734b4a1a1c57acb79193127dcc8914d5242dd7"
+checksum = "287272293e9d8c41773cec55e365490fe034813a2f172f502d6ddcf75b2f582b"
 dependencies = [
  "event-listener",
 ]
@@ -387,7 +328,7 @@ checksum = "cd56dd203fef61ac097dd65721a419ddccb106b2d2b70ba60a6b529f03961a51"
 dependencies = [
  "async-stream-impl",
  "futures-core",
- "pin-project-lite 0.2.9",
+ "pin-project-lite 0.2.12",
 ]
 
 [[package]]
@@ -398,18 +339,18 @@ checksum = "16e62a023e7c117e27523144c5d2459f4397fcc3cab0085af8e2224f643a0193"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.16",
+ "syn 2.0.29",
 ]
 
 [[package]]
 name = "async-trait"
-version = "0.1.68"
+version = "0.1.73"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b9ccdd8f2a161be9bd5c023df56f1b2a0bd1d83872ae53b71a84a12c9bf6e842"
+checksum = "bc00ceb34980c03614e35a3a4e218276a0a824e911d07651cd0d858a51e8c0f0"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.16",
+ "syn 2.0.29",
 ]
 
 [[package]]
@@ -420,28 +361,22 @@ checksum = "b6d7b9decdf35d8908a7e3ef02f64c5e9b1695e230154c0e8de3969142d9b94c"
 dependencies = [
  "futures",
  "pharos",
- "rustc_version 0.4.0",
+ "rustc_version",
 ]
 
 [[package]]
 name = "asynchronous-codec"
-version = "0.6.1"
+version = "0.6.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "06a0daa378f5fd10634e44b0a29b2a87b890657658e072a30d6f26e57ddee182"
+checksum = "4057f2c32adbb2fc158e22fb38433c8e9bbf76b75a4732c7c0cbaf695fb65568"
 dependencies = [
  "bytes",
  "futures-sink",
  "futures-util",
  "memchr",
- "pin-project-lite 0.2.9",
+ "pin-project-lite 0.2.12",
 ]
 
-[[package]]
-name = "atomic-waker"
-version = "1.1.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1181e1e0d1fce796a03db1ae795d67167da795f9cf4a39c37589e85ef57f26d3"
-
 [[package]]
 name = "attohttpc"
 version = "0.16.3"
@@ -494,13 +429,13 @@ checksum = "d468802bab17cbc0cc575e9b053f41e72aa36bfa6b7f55e3529ffa43161b97fa"
 
 [[package]]
 name = "axum"
-version = "0.5.17"
+version = "0.6.20"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "acee9fd5073ab6b045a275b3e709c163dd36c90685219cb21804a147b58dba43"
+checksum = "3b829e4e32b91e643de6eafe82b1d90675f5874230191a4ffbc1b336dec4d6bf"
 dependencies = [
  "async-trait",
  "axum-core",
- "bitflags",
+ "bitflags 1.3.2",
  "bytes",
  "futures-util",
  "http",
@@ -511,23 +446,24 @@ dependencies = [
  "memchr",
  "mime",
  "percent-encoding",
- "pin-project-lite 0.2.9",
+ "pin-project-lite 0.2.12",
+ "rustversion",
  "serde",
  "serde_json",
+ "serde_path_to_error",
  "serde_urlencoded",
  "sync_wrapper",
  "tokio",
  "tower",
- "tower-http",
  "tower-layer",
  "tower-service",
 ]
 
 [[package]]
 name = "axum-core"
-version = "0.2.9"
+version = "0.3.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "37e5939e02c56fecd5c017c37df4238c0a839fa76b7f97acdd7efb804fd181cc"
+checksum = "759fa577a247914fd3f7f76d62972792636412fbfd634cd452f6a385a74d2d2c"
 dependencies = [
  "async-trait",
  "bytes",
@@ -535,21 +471,22 @@ dependencies = [
  "http",
  "http-body",
  "mime",
+ "rustversion",
  "tower-layer",
  "tower-service",
 ]
 
 [[package]]
 name = "backtrace"
-version = "0.3.67"
+version = "0.3.68"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "233d376d6d185f2a3093e58f283f60f880315b6c60075b01f36b3b85154564ca"
+checksum = "4319208da049c43661739c5fade2ba182f09d1dc2299b32298d3a31692b17e12"
 dependencies = [
  "addr2line",
  "cc",
  "cfg-if",
  "libc",
- "miniz_oxide 0.6.2",
+ "miniz_oxide",
  "object",
  "rustc-demangle",
 ]
@@ -580,9 +517,9 @@ checksum = "9e1b586273c5702936fe7b7d6896644d8be71e6314cfe09d3167c95f712589e8"
 
 [[package]]
 name = "base64"
-version = "0.21.1"
+version = "0.21.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3f1e31e207a6b8fb791a38ea3105e6cb541f55e4d029902d3039a4ad07cc4105"
+checksum = "604178f6c5c21f02dc555784810edfb88d34ac2c73b2eae109655649ee73ce3d"
 
 [[package]]
 name = "base64ct"
@@ -593,7 +530,7 @@ checksum = "8c3c1a368f70d6cf7302d78f8f7093da241fb8e8807c05cc9e51a125895a6d5b"
 [[package]]
 name = "beacon-api-client"
 version = "0.1.0"
-source = "git+https://github.com/ralexstokes/beacon-api-client#30679e9e25d61731cde54e14cd8a3688a39d8e5b"
+source = "git+https://github.com/ralexstokes/beacon-api-client?rev=93d7e8c#93d7e8c38fe9782c4862909663e7b57c44f805a9"
 dependencies = [
  "ethereum-consensus",
  "http",
@@ -619,6 +556,7 @@ dependencies = [
  "eth1",
  "eth2",
  "ethereum_hashing",
+ "ethereum_serde_utils",
  "ethereum_ssz",
  "ethereum_ssz_derive",
  "execution_layer",
@@ -650,7 +588,7 @@ dependencies = [
  "slog",
  "sloggers",
  "slot_clock",
- "smallvec",
+ "smallvec 1.11.0",
  "ssz_types",
  "state_processing",
  "store",
@@ -668,7 +606,7 @@ dependencies = [
 
 [[package]]
 name = "beacon_node"
-version = "4.3.0"
+version = "4.4.1"
 dependencies = [
  "beacon_chain",
  "clap",
@@ -700,6 +638,32 @@ dependencies = [
  "unused_port",
 ]
 
+[[package]]
+name = "beacon_processor"
+version = "0.1.0"
+dependencies = [
+ "derivative",
+ "ethereum_ssz",
+ "fnv",
+ "futures",
+ "hex",
+ "itertools",
+ "lazy_static",
+ "lighthouse_metrics",
+ "lighthouse_network",
+ "logging",
+ "num_cpus",
+ "parking_lot 0.12.1",
+ "serde",
+ "slog",
+ "slot_clock",
+ "strum",
+ "task_executor",
+ "tokio",
+ "tokio-util 0.6.10",
+ "types",
+]
+
 [[package]]
 name = "bincode"
 version = "1.3.3"
@@ -715,7 +679,7 @@ version = "0.59.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2bd2a9a458e8f4304c52c43ebb0cfbd520289f8379a52e329a38afda99bf8eb8"
 dependencies = [
- "bitflags",
+ "bitflags 1.3.2",
  "cexpr",
  "clang-sys",
  "lazy_static",
@@ -734,6 +698,12 @@ version = "1.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "bef38d45163c2f1dde094a7dfd33ccf595c92905c8f8f4fdc18d06fb1037718a"
 
+[[package]]
+name = "bitflags"
+version = "2.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b4682ae6287fcf752ecaabbfcc7b6f9b72aa33933dc23a554d853aea8eea8635"
+
 [[package]]
 name = "bitvec"
 version = "0.20.4"
@@ -786,16 +756,6 @@ dependencies = [
  "generic-array",
 ]
 
-[[package]]
-name = "block-modes"
-version = "0.7.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "57a0e8073e8baa88212fb5823574c02ebccb395136ba9a164ab89379ec6072f0"
-dependencies = [
- "block-padding",
- "cipher 0.2.5",
-]
-
 [[package]]
 name = "block-padding"
 version = "0.2.1"
@@ -823,31 +783,29 @@ dependencies = [
 
 [[package]]
 name = "blst"
-version = "0.3.10"
+version = "0.3.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6a30d0edd9dd1c60ddb42b80341c7852f6f985279a5c1a83659dcb65899dec99"
+checksum = "c94087b935a822949d3291a9989ad2b2051ea141eda0fd4e478a75f6aa3e604b"
 dependencies = [
  "cc",
  "glob",
  "threadpool",
- "which",
  "zeroize",
 ]
 
 [[package]]
 name = "bollard-stubs"
-version = "1.41.0"
+version = "1.42.0-rc.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ed2f2e73fffe9455141e170fb9c1feb0ac521ec7e7dcd47a7cab72a658490fb8"
+checksum = "ed59b5c00048f48d7af971b71f800fdf23e858844a6f9e4d32ca72e9399e7864"
 dependencies = [
- "chrono",
  "serde",
  "serde_with",
 ]
 
 [[package]]
 name = "boot_node"
-version = "4.3.0"
+version = "4.4.1"
 dependencies = [
  "beacon_node",
  "clap",
@@ -878,13 +836,12 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "771fe0050b883fcc3ea2359b1a96bcfbc090b7116eae7c3c512c7a083fdf23d3"
 
 [[package]]
-name = "buf_redux"
-version = "0.8.4"
+name = "bs58"
+version = "0.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b953a6887648bb07a535631f2bc00fbdb2a2216f135552cb3f534ed136b9c07f"
+checksum = "f5353f36341f7451062466f0b755b96ac3a9547e4d7f6b70d603fc721a7d7896"
 dependencies = [
- "memchr",
- "safemem",
+ "tinyvec",
 ]
 
 [[package]]
@@ -901,9 +858,9 @@ dependencies = [
 
 [[package]]
 name = "bumpalo"
-version = "3.12.2"
+version = "3.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3c6ed94e98ecff0c12dd1b04c15ec0d7d9458ca8fe806cea6f12954efe74c63b"
+checksum = "a3e2c3daef883ecc1b5d58c15adae93470a91d425f3532ba1695849656af3fc1"
 
 [[package]]
 name = "byte-slice-cast"
@@ -957,25 +914,25 @@ dependencies = [
  "ethereum_ssz_derive",
  "quickcheck",
  "quickcheck_macros",
- "smallvec",
+ "smallvec 1.11.0",
  "ssz_types",
  "tree_hash",
 ]
 
 [[package]]
 name = "camino"
-version = "1.1.4"
+version = "1.1.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c530edf18f37068ac2d977409ed5cd50d53d73bc653c7647b48eb78976ac9ae2"
+checksum = "c59e92b5a388f549b863a7bea62612c09f24c8393560709a54558a9abdfb3b9c"
 dependencies = [
  "serde",
 ]
 
 [[package]]
 name = "cargo-platform"
-version = "0.1.2"
+version = "0.1.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cbdb825da8a5df079a43676dbe042702f1707b1109f713a01420fbb4cc71fa27"
+checksum = "2cfa25e60aea747ec7e1124f238816749faa93759c6ff5b31f1ccdda137f4479"
 dependencies = [
  "serde",
 ]
@@ -988,7 +945,7 @@ checksum = "eee4243f1f26fc7a42710e7439c149e2b10b05472f88090acce52632f231a73a"
 dependencies = [
  "camino",
  "cargo-platform",
- "semver 1.0.17",
+ "semver",
  "serde",
  "serde_json",
  "thiserror",
@@ -1002,19 +959,12 @@ checksum = "37b2a672a2cb129a2e41c10b1224bb368f9f37a2b16b612598138befd7b37eb5"
 
 [[package]]
 name = "cc"
-version = "1.0.79"
+version = "1.0.82"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "50d30906286121d95be3d479533b458f87493b30a4b5f79a607db8f5d11aa91f"
-
-[[package]]
-name = "ccm"
-version = "0.3.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5aca1a8fbc20b50ac9673ff014abfb2b5f4085ee1a850d408f14a159c5853ac7"
+checksum = "305fe645edc1442a0fa8b6726ba61d422798d37a52e12eaecf4b022ebbb88f01"
 dependencies = [
- "aead 0.3.2",
- "cipher 0.2.5",
- "subtle",
+ "jobserver",
+ "libc",
 ]
 
 [[package]]
@@ -1023,7 +973,7 @@ version = "0.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6fac387a98bb7c37292057cffc56d62ecb629900026402633ae9160df93a8766"
 dependencies = [
- "nom 7.1.3",
+ "nom",
 ]
 
 [[package]]
@@ -1050,7 +1000,7 @@ version = "0.9.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a18446b09be63d457bbec447509e85f662f32952b035ce892290396bc0b0cff5"
 dependencies = [
- "aead 0.4.3",
+ "aead",
  "chacha20",
  "cipher 0.3.0",
  "poly1305",
@@ -1059,29 +1009,16 @@ dependencies = [
 
 [[package]]
 name = "chrono"
-version = "0.4.24"
+version = "0.4.26"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4e3c5919066adf22df73762e50cffcde3a758f2a848b113b586d1f86728b673b"
+checksum = "ec837a71355b28f6556dbd569b37b3f363091c0bd4b2e735674521b4c5fd9bc5"
 dependencies = [
+ "android-tzdata",
  "iana-time-zone",
- "js-sys",
- "num-integer",
  "num-traits",
- "serde",
- "time 0.1.45",
- "wasm-bindgen",
  "winapi",
 ]
 
-[[package]]
-name = "cipher"
-version = "0.2.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "12f8e7987cbd042a63249497f41aed09f8e65add917ea6566effbc56578d6801"
-dependencies = [
- "generic-array",
-]
-
 [[package]]
 name = "cipher"
 version = "0.3.0"
@@ -1120,7 +1057,7 @@ checksum = "a0610544180c38b88101fecf2dd634b174a62eef6946f84dfc6a7127512b381c"
 dependencies = [
  "ansi_term",
  "atty",
- "bitflags",
+ "bitflags 1.3.2",
  "strsim 0.8.0",
  "textwrap",
  "unicode-width",
@@ -1148,6 +1085,7 @@ name = "client"
 version = "0.2.0"
 dependencies = [
  "beacon_chain",
+ "beacon_processor",
  "directory",
  "dirs",
  "environment",
@@ -1178,7 +1116,7 @@ dependencies = [
  "state_processing",
  "store",
  "task_executor",
- "time 0.3.21",
+ "time",
  "timer",
  "tokio",
  "types",
@@ -1219,9 +1157,15 @@ dependencies = [
 
 [[package]]
 name = "const-oid"
-version = "0.9.2"
+version = "0.9.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "520fbf3c07483f94e3e3ca9d0cfd913d7718ef2483d2cfd91c0d9e91474ab913"
+checksum = "28c122c3980598d243d63d9a704629a2d748d101f278052ff068be5a4423ab6f"
+
+[[package]]
+name = "constant_time_eq"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "245097e9a4535ee1e3e3931fcfcd55a796a44c643e8596ff6566d68f09b87bbc"
 
 [[package]]
 name = "convert_case"
@@ -1256,28 +1200,13 @@ dependencies = [
 
 [[package]]
 name = "cpufeatures"
-version = "0.2.7"
+version = "0.2.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3e4c1eaa2012c47becbbad2ab175484c2a84d1185b566fb2cc5b8707343dfe58"
+checksum = "a17b76ff3a4162b0b27f354a0c87015ddad39d35f9c0c36607a3bdd175dde1f1"
 dependencies = [
  "libc",
 ]
 
-[[package]]
-name = "crc"
-version = "3.0.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "86ec7a15cbe22e59248fc7eadb1907dab5ba09372595da4d73dd805ed4417dfe"
-dependencies = [
- "crc-catalog",
-]
-
-[[package]]
-name = "crc-catalog"
-version = "2.2.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9cace84e55f07e7301bae1c519df89cdad8cc3cd868413d3fdbdeca9ff3db484"
-
 [[package]]
 name = "crc32fast"
 version = "1.3.2"
@@ -1346,22 +1275,22 @@ dependencies = [
 
 [[package]]
 name = "crossbeam-epoch"
-version = "0.9.14"
+version = "0.9.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "46bd5f3f85273295a9d14aedfb86f6aadbff6d8f5295c4a9edb08e819dcf5695"
+checksum = "ae211234986c545741a7dc064309f67ee1e5ad243d0e48335adc0484d960bcc7"
 dependencies = [
  "autocfg 1.1.0",
  "cfg-if",
  "crossbeam-utils",
- "memoffset 0.8.0",
+ "memoffset 0.9.0",
  "scopeguard",
 ]
 
 [[package]]
 name = "crossbeam-utils"
-version = "0.8.15"
+version = "0.8.16"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3c063cd8cc95f5c377ed0d4b49a4b21f632396ff690e8470c29b3359b346984b"
+checksum = "5a22b2d63d4d1dc0b7f1b6b2747dd0088008a9be28b6ddf0b1e7d335e3037294"
 dependencies = [
  "cfg-if",
 ]
@@ -1403,7 +1332,6 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1bfb12502f3fc46cca1bb51ac28df9d618d813cdc3d2f25b9fe775a34af26bb3"
 dependencies = [
  "generic-array",
- "rand_core 0.6.4",
  "typenum",
 ]
 
@@ -1429,9 +1357,9 @@ dependencies = [
 
 [[package]]
 name = "csv"
-version = "1.2.1"
+version = "1.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0b015497079b9a9d69c02ad25de6c0a6edef051ea6360a327d0bd05802ef64ad"
+checksum = "626ae34994d3d8d668f4269922248239db4ae42d538b14c398b74a52208e8086"
 dependencies = [
  "csv-core",
  "itoa",
@@ -1457,20 +1385,11 @@ dependencies = [
  "cipher 0.3.0",
 ]
 
-[[package]]
-name = "ctr"
-version = "0.9.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0369ee1ad671834580515889b80f2ea915f23b8be8d0daa4bbaf2ac5c7590835"
-dependencies = [
- "cipher 0.4.4",
-]
-
 [[package]]
 name = "ctrlc"
-version = "3.3.0"
+version = "3.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "04d778600249295e82b6ab12e291ed9029407efee0cfb7baf67157edc65964df"
+checksum = "2a011bbe2c35ce9c1f143b7af6f94f29a167beb4cd1d29e6740ce836f723120e"
 dependencies = [
  "nix 0.26.2",
  "windows-sys 0.48.0",
@@ -1491,37 +1410,40 @@ dependencies = [
 
 [[package]]
 name = "curve25519-dalek"
-version = "4.0.0-rc.2"
+version = "4.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "03d928d978dbec61a1167414f5ec534f24bea0d7a0d24dd9b6233d3d8223e585"
+checksum = "f711ade317dd348950a9910f81c5947e3d8907ebd2b83f76203ff1807e6a2bc2"
 dependencies = [
  "cfg-if",
+ "cpufeatures",
+ "curve25519-dalek-derive",
  "digest 0.10.7",
  "fiat-crypto",
- "packed_simd_2",
  "platforms 3.0.2",
+ "rustc_version",
  "subtle",
  "zeroize",
 ]
 
+[[package]]
+name = "curve25519-dalek-derive"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "83fdaf97f4804dcebfa5862639bc9ce4121e82140bec2a987ac5140294865b5b"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.29",
+]
+
 [[package]]
 name = "darling"
 version = "0.13.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a01d95850c592940db9b8194bc39f4bc0e89dee5c4265e4b1807c34a9aba453c"
 dependencies = [
- "darling_core 0.13.4",
- "darling_macro 0.13.4",
-]
-
-[[package]]
-name = "darling"
-version = "0.14.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7b750cb3417fd1b327431a470f388520309479ab0bf5e323505daf0290cd3850"
-dependencies = [
- "darling_core 0.14.4",
- "darling_macro 0.14.4",
+ "darling_core",
+ "darling_macro",
 ]
 
 [[package]]
@@ -1538,38 +1460,13 @@ dependencies = [
  "syn 1.0.109",
 ]
 
-[[package]]
-name = "darling_core"
-version = "0.14.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "109c1ca6e6b7f82cc233a97004ea8ed7ca123a9af07a8230878fcfda9b158bf0"
-dependencies = [
- "fnv",
- "ident_case",
- "proc-macro2",
- "quote",
- "strsim 0.10.0",
- "syn 1.0.109",
-]
-
 [[package]]
 name = "darling_macro"
 version = "0.13.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9c972679f83bdf9c42bd905396b6c3588a843a17f0f16dfcfa3e2c5d57441835"
 dependencies = [
- "darling_core 0.13.4",
- "quote",
- "syn 1.0.109",
-]
-
-[[package]]
-name = "darling_macro"
-version = "0.14.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a4aab4dbc9f7611d8b55048a3a16d2d010c2c8334e46304b40ac1cc14bf3b48e"
-dependencies = [
- "darling_core 0.14.4",
+ "darling_core",
  "quote",
  "syn 1.0.109",
 ]
@@ -1663,7 +1560,7 @@ dependencies = [
  "hex",
  "reqwest",
  "serde_json",
- "sha2 0.10.6",
+ "sha2 0.10.7",
  "tree_hash",
  "types",
 ]
@@ -1675,48 +1572,40 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f1a467a65c5e759bce6e65eaf91cc29f466cdc57cb65777bd646872a8a1fd4de"
 dependencies = [
  "const-oid",
- "pem-rfc7468",
  "zeroize",
 ]
 
 [[package]]
 name = "der"
-version = "0.7.6"
+version = "0.7.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "56acb310e15652100da43d130af8d97b509e95af61aab1c5a7939ef24337ee17"
+checksum = "fffa369a668c8af7dbf8b5e56c9f744fbd399949ed171606040001947de40b1c"
 dependencies = [
  "const-oid",
+ "pem-rfc7468",
  "zeroize",
 ]
 
-[[package]]
-name = "der-parser"
-version = "7.0.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fe398ac75057914d7d07307bf67dc7f3f574a26783b4fc7805a20ffa9f506e82"
-dependencies = [
- "asn1-rs 0.3.1",
- "displaydoc",
- "nom 7.1.3",
- "num-bigint",
- "num-traits",
- "rusticata-macros",
-]
-
 [[package]]
 name = "der-parser"
 version = "8.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "dbd676fbbab537128ef0278adb5576cf363cff6aa22a7b24effe97347cfab61e"
 dependencies = [
- "asn1-rs 0.5.2",
+ "asn1-rs",
  "displaydoc",
- "nom 7.1.3",
+ "nom",
  "num-bigint",
  "num-traits",
  "rusticata-macros",
 ]
 
+[[package]]
+name = "deranged"
+version = "0.3.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7684a49fb1af197853ef7b2ee694bc1f5b4179556f1e5710e1760c5db6f5e929"
+
 [[package]]
 name = "derivative"
 version = "2.2.0"
@@ -1730,43 +1619,13 @@ dependencies = [
 
 [[package]]
 name = "derive_arbitrary"
-version = "1.3.0"
-source = "git+https://github.com/michaelsproul/arbitrary?rev=f002b99989b561ddce62e4cf2887b0f8860ae991#f002b99989b561ddce62e4cf2887b0f8860ae991"
+version = "1.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "53e0efad4403bfc52dc201159c4b842a246a14b98c64b55dfd0f2d89729dfeb8"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 1.0.109",
-]
-
-[[package]]
-name = "derive_builder"
-version = "0.11.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d07adf7be193b71cc36b193d0f5fe60b918a3a9db4dad0449f57bcfd519704a3"
-dependencies = [
- "derive_builder_macro",
-]
-
-[[package]]
-name = "derive_builder_core"
-version = "0.11.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1f91d4cfa921f1c05904dc3c57b4a32c38aed3340cce209f3a6fd1478babafc4"
-dependencies = [
- "darling 0.14.4",
- "proc-macro2",
- "quote",
- "syn 1.0.109",
-]
-
-[[package]]
-name = "derive_builder_macro"
-version = "0.11.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8f0314b72bed045f3a68671b3c86328386762c93f82d98c65c3cb5e5f573dd68"
-dependencies = [
- "derive_builder_core",
- "syn 1.0.109",
+ "syn 2.0.29",
 ]
 
 [[package]]
@@ -1778,17 +1637,17 @@ dependencies = [
  "convert_case",
  "proc-macro2",
  "quote",
- "rustc_version 0.4.0",
+ "rustc_version",
  "syn 1.0.109",
 ]
 
 [[package]]
 name = "diesel"
-version = "2.0.4"
+version = "2.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "72eb77396836a4505da85bae0712fa324b74acfe1876d7c2f7e694ef3d0ee373"
+checksum = "f7a532c1f99a0f596f6960a60d1e119e91582b24b39e2d83a190e61262c3ef0c"
 dependencies = [
- "bitflags",
+ "bitflags 2.4.0",
  "byteorder",
  "diesel_derives",
  "itoa",
@@ -1798,27 +1657,36 @@ dependencies = [
 
 [[package]]
 name = "diesel_derives"
-version = "2.0.2"
+version = "2.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0ad74fdcf086be3d4fdd142f67937678fe60ed431c3b2f08599e7687269410c4"
+checksum = "74398b79d81e52e130d991afeed9c86034bb1b7735f46d2f5bf7deb261d80303"
 dependencies = [
- "proc-macro-error",
+ "diesel_table_macro_syntax",
  "proc-macro2",
  "quote",
- "syn 1.0.109",
+ "syn 2.0.29",
 ]
 
 [[package]]
 name = "diesel_migrations"
-version = "2.0.0"
+version = "2.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e9ae22beef5e9d6fab9225ddb073c1c6c1a7a6ded5019d5da11d1e5c5adc34e2"
+checksum = "6036b3f0120c5961381b570ee20a02432d7e2d27ea60de9578799cf9156914ac"
 dependencies = [
  "diesel",
  "migrations_internals",
  "migrations_macros",
 ]
 
+[[package]]
+name = "diesel_table_macro_syntax"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fc5557efc453706fed5e4fa85006fe9817c224c3f480a34c7e5959fd700921c5"
+dependencies = [
+ "syn 2.0.29",
+]
+
 [[package]]
 name = "digest"
 version = "0.9.0"
@@ -1892,28 +1760,29 @@ dependencies = [
 
 [[package]]
 name = "discv5"
-version = "0.3.0"
+version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "77f32d27968ba86689e3f0eccba0383414348a6fc5918b0a639c98dd81e20ed6"
+checksum = "98c05fa26996c6141f78ac4fafbe297a7fa69690565ba4e0d1f2e60bde5ce501"
 dependencies = [
  "aes 0.7.5",
- "aes-gcm 0.9.4",
+ "aes-gcm",
  "arrayvec",
  "delay_map",
- "enr 0.8.1",
+ "enr 0.9.0",
  "fnv",
  "futures",
  "hashlink 0.7.0",
  "hex",
  "hkdf",
  "lazy_static",
- "libp2p-core 0.36.0",
+ "libp2p-core",
+ "libp2p-identity",
  "lru 0.7.8",
  "more-asserts",
  "parking_lot 0.11.2",
  "rand 0.8.5",
  "rlp",
- "smallvec",
+ "smallvec 1.11.0",
  "socket2 0.4.9",
  "tokio",
  "tracing",
@@ -1930,14 +1799,14 @@ checksum = "487585f4d0c6655fe74905e2504d8ad6908e4db67f744eb140876906c2f3175d"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.16",
+ "syn 2.0.29",
 ]
 
 [[package]]
 name = "dtoa"
-version = "1.0.6"
+version = "1.0.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "65d09067bfacaa79114679b279d7f5885b53295b1e2cfb4e79c8e4bd3d633169"
+checksum = "dcbb2bf8e87535c23f7a8a321e364ce21462d0ff10cb6407820e8e96dfff6653"
 
 [[package]]
 name = "dunce"
@@ -1959,11 +1828,11 @@ dependencies = [
 
 [[package]]
 name = "ecdsa"
-version = "0.16.7"
+version = "0.16.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0997c976637b606099b9985693efa3581e84e41f5c11ba5255f88711058ad428"
+checksum = "a4b1e0c257a9e9f25f90ff76d7a68360ed497ee519c8e428d1825ef0000799d4"
 dependencies = [
- "der 0.7.6",
+ "der 0.7.8",
  "digest 0.10.7",
  "elliptic-curve 0.13.5",
  "rfc6979 0.4.0",
@@ -1973,18 +1842,9 @@ dependencies = [
 
 [[package]]
 name = "ed25519"
-version = "1.5.3"
+version = "2.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "91cff35c70bba8a626e3185d8cd48cc11b5437e1a5bcd15b9b5fa3c64b6dfee7"
-dependencies = [
- "signature 1.6.4",
-]
-
-[[package]]
-name = "ed25519"
-version = "2.2.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5fb04eee5d9d907f29e80ee6b0e78f7e2c82342c63e3580d8c4f69d9d5aad963"
+checksum = "60f6d271ca33075c88028be6f04d502853d63a5ece419d269c15315d4fc1cf1d"
 dependencies = [
  "pkcs8 0.10.2",
  "signature 2.1.0",
@@ -1992,29 +1852,15 @@ dependencies = [
 
 [[package]]
 name = "ed25519-dalek"
-version = "1.0.1"
+version = "2.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c762bae6dcaf24c4c84667b8579785430908723d5c889f469d76a41d59cc7a9d"
+checksum = "7277392b266383ef8396db7fdeb1e77b6c52fed775f5df15bb24f35b72156980"
 dependencies = [
- "curve25519-dalek 3.2.0",
- "ed25519 1.5.3",
- "rand 0.7.3",
- "serde",
- "sha2 0.9.9",
- "zeroize",
-]
-
-[[package]]
-name = "ed25519-dalek"
-version = "2.0.0-rc.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "798f704d128510932661a3489b08e3f4c934a01d61c5def59ae7b8e48f19665a"
-dependencies = [
- "curve25519-dalek 4.0.0-rc.2",
- "ed25519 2.2.1",
+ "curve25519-dalek 4.0.0",
+ "ed25519",
  "rand_core 0.6.4",
  "serde",
- "sha2 0.10.6",
+ "sha2 0.10.7",
  "zeroize",
 ]
 
@@ -2051,9 +1897,9 @@ dependencies = [
 
 [[package]]
 name = "either"
-version = "1.8.1"
+version = "1.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7fcaabb2fef8c910e7f4c7ce9f67a1283a1715879a7c230ca9d6d1ae31f16d91"
+checksum = "a26ae43d7bcc3b814de94796a5e736d4029efb0ee900c12e2d54c993ad1a1e07"
 
 [[package]]
 name = "elliptic-curve"
@@ -2068,8 +1914,6 @@ dependencies = [
  "ff 0.12.1",
  "generic-array",
  "group 0.12.1",
- "hkdf",
- "pem-rfc7468",
  "pkcs8 0.9.0",
  "rand_core 0.6.4",
  "sec1 0.3.0",
@@ -2089,9 +1933,10 @@ dependencies = [
  "ff 0.13.0",
  "generic-array",
  "group 0.13.0",
+ "pem-rfc7468",
  "pkcs8 0.10.2",
  "rand_core 0.6.4",
- "sec1 0.7.2",
+ "sec1 0.7.3",
  "subtle",
  "zeroize",
 ]
@@ -2112,7 +1957,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "26fa0a0be8915790626d5759eb51fe47435a8eac92c2f212bd2da9aa7f30ea56"
 dependencies = [
  "base64 0.13.1",
- "bs58",
+ "bs58 0.4.0",
  "bytes",
  "hex",
  "k256 0.11.6",
@@ -2126,19 +1971,20 @@ dependencies = [
 
 [[package]]
 name = "enr"
-version = "0.8.1"
+version = "0.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cf56acd72bb22d2824e66ae8e9e5ada4d0de17a69c7fd35569dde2ada8ec9116"
+checksum = "0be7b2ac146c1f99fe245c02d16af0696450d8e06c135db75e10eeb9e642c20d"
 dependencies = [
- "base64 0.13.1",
+ "base64 0.21.2",
  "bytes",
- "ed25519-dalek 2.0.0-rc.2",
+ "ed25519-dalek",
  "hex",
  "k256 0.13.1",
  "log",
  "rand 0.8.5",
  "rlp",
  "serde",
+ "serde-hex",
  "sha3 0.10.8",
  "zeroize",
 ]
@@ -2201,10 +2047,16 @@ dependencies = [
 ]
 
 [[package]]
-name = "errno"
-version = "0.3.1"
+name = "equivalent"
+version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4bcfec3a70f97c962c307b2d2c56e358cf1d00b558d74262b5f929ee8cc7e73a"
+checksum = "5443807d6dff69373d433ab9ef5378ad8df50ca6298caf15de6e52e24aaf54d5"
+
+[[package]]
+name = "errno"
+version = "0.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6b30f669a7961ef1631673d2766cc92f52d64f7ef354d4fe0ddfd30ed52f0f4f"
 dependencies = [
  "errno-dragonfly",
  "libc",
@@ -2294,7 +2146,7 @@ dependencies = [
  "mediatype",
  "mime",
  "pretty_reqwest_error",
- "procinfo",
+ "procfs",
  "proto_array",
  "psutil",
  "reqwest",
@@ -2339,7 +2191,7 @@ dependencies = [
  "hex",
  "num-bigint-dig",
  "ring",
- "sha2 0.10.6",
+ "sha2 0.10.7",
  "zeroize",
 ]
 
@@ -2361,7 +2213,7 @@ dependencies = [
  "sha2 0.9.9",
  "tempfile",
  "unicode-normalization",
- "uuid 0.8.2",
+ "uuid",
  "zeroize",
 ]
 
@@ -2372,9 +2224,16 @@ dependencies = [
  "discv5",
  "eth2_config",
  "ethereum_ssz",
+ "logging",
+ "pretty_reqwest_error",
+ "reqwest",
+ "sensitive_url",
  "serde_yaml",
+ "sha2 0.10.7",
+ "slog",
  "tempfile",
  "types",
+ "url",
  "zip",
 ]
 
@@ -2391,7 +2250,7 @@ dependencies = [
  "serde_repr",
  "tempfile",
  "tiny-bip39",
- "uuid 0.8.2",
+ "uuid",
 ]
 
 [[package]]
@@ -2466,11 +2325,11 @@ dependencies = [
 [[package]]
 name = "ethereum-consensus"
 version = "0.1.1"
-source = "git+https://github.com/ralexstokes//ethereum-consensus?rev=9b0ee0a8a45b968c8df5e7e64ea1c094e16f053d#9b0ee0a8a45b968c8df5e7e64ea1c094e16f053d"
+source = "git+https://github.com/ralexstokes/ethereum-consensus?rev=e380108#e380108d15fcc40349927fdf3d11c71f9edb67c2"
 dependencies = [
  "async-stream",
  "blst",
- "bs58",
+ "bs58 0.4.0",
  "enr 0.6.2",
  "hex",
  "integer-sqrt",
@@ -2479,8 +2338,9 @@ dependencies = [
  "rand 0.8.5",
  "serde",
  "serde_json",
+ "serde_yaml",
  "sha2 0.9.9",
- "ssz-rs",
+ "ssz_rs",
  "thiserror",
  "tokio",
  "tokio-stream",
@@ -2525,7 +2385,7 @@ dependencies = [
  "cpufeatures",
  "lazy_static",
  "ring",
- "sha2 0.10.6",
+ "sha2 0.10.7",
 ]
 
 [[package]]
@@ -2543,22 +2403,22 @@ dependencies = [
 
 [[package]]
 name = "ethereum_ssz"
-version = "0.5.2"
+version = "0.5.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "32749e96305376af40d7a7ee8ea4c4c64c68d09ff94a81ab78c8d9bc7153c221"
+checksum = "e61ffea29f26e8249d35128a82ec8d3bd4fbc80179ea5f5e5e3daafef6a80fcb"
 dependencies = [
  "ethereum-types 0.14.1",
  "itertools",
- "smallvec",
+ "smallvec 1.11.0",
 ]
 
 [[package]]
 name = "ethereum_ssz_derive"
-version = "0.5.2"
+version = "0.5.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d9cac7ef2107926cea34c0064056f9bb134d2085eef882388d151d2e59174cf0"
+checksum = "6085d7fd3cf84bd2b8fec150d54c8467fb491d8db9c460607c5534f653a0ee38"
 dependencies = [
- "darling 0.13.4",
+ "darling",
  "proc-macro2",
  "quote",
  "syn 1.0.109",
@@ -2594,7 +2454,7 @@ dependencies = [
  "dunce",
  "ethers-core",
  "eyre",
- "getrandom 0.2.9",
+ "getrandom 0.2.10",
  "hex",
  "proc-macro2",
  "quote",
@@ -2603,7 +2463,7 @@ dependencies = [
  "serde",
  "serde_json",
  "syn 1.0.109",
- "toml",
+ "toml 0.5.11",
  "url",
  "walkdir",
 ]
@@ -2666,7 +2526,7 @@ dependencies = [
  "futures-core",
  "futures-timer",
  "futures-util",
- "getrandom 0.2.9",
+ "getrandom 0.2.10",
  "hashers",
  "hex",
  "http",
@@ -2753,7 +2613,7 @@ dependencies = [
  "serde_json",
  "slog",
  "slot_clock",
- "ssz-rs",
+ "ssz_rs",
  "ssz_types",
  "state_processing",
  "strum",
@@ -2810,6 +2670,12 @@ dependencies = [
  "instant",
 ]
 
+[[package]]
+name = "fastrand"
+version = "2.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6999dc1837253364c2ebb0704ba97994bd874e8f195d665c50b7548f6ea92764"
+
 [[package]]
 name = "ff"
 version = "0.12.1"
@@ -2844,12 +2710,12 @@ checksum = "e825f6987101665dea6ec934c09ec6d721de7bc1bf92248e1d5810c8cd636b77"
 
 [[package]]
 name = "field-offset"
-version = "0.3.5"
+version = "0.3.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a3cf3a800ff6e860c863ca6d4b16fd999db8b752819c1606884047b73e468535"
+checksum = "38e2275cc4e4fc009b0669731a1e5ab7ebf11f469eaede2bab9309a5b4d6057f"
 dependencies = [
- "memoffset 0.8.0",
- "rustc_version 0.4.0",
+ "memoffset 0.9.0",
+ "rustc_version",
 ]
 
 [[package]]
@@ -2885,21 +2751,15 @@ dependencies = [
  "static_assertions",
 ]
 
-[[package]]
-name = "fixedbitset"
-version = "0.4.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0ce7134b9999ecaf8bcd65542e436736ef32ddca1b3e06094cb6ec5755203b80"
-
 [[package]]
 name = "flate2"
-version = "1.0.26"
+version = "1.0.27"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3b9429470923de8e8cbd4d2dc513535400b4b3fef0319fb5c4e1f520a7bef743"
+checksum = "c6c98ee8095e9d1dcbf2fcc6d95acccb90d1c81db1e44725c6a984b1dbdfb010"
 dependencies = [
  "crc32fast",
  "libz-sys",
- "miniz_oxide 0.7.1",
+ "miniz_oxide",
 ]
 
 [[package]]
@@ -2940,9 +2800,9 @@ dependencies = [
 
 [[package]]
 name = "form_urlencoded"
-version = "1.1.0"
+version = "1.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a9c384f161156f5260c24a097c56119f9be8c798586aecc13afbcbe7b7e26bf8"
+checksum = "a62bc1cf6f830c2ec14a513a9fb124d0a213a629668a4186f329db21fe045652"
 dependencies = [
  "percent-encoding",
 ]
@@ -3024,12 +2884,12 @@ version = "1.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "49a9d51ce47660b1e808d3c990b4709f2f415d928835a17dfd16991515c46bce"
 dependencies = [
- "fastrand",
+ "fastrand 1.9.0",
  "futures-core",
  "futures-io",
  "memchr",
  "parking",
- "pin-project-lite 0.2.9",
+ "pin-project-lite 0.2.12",
  "waker-fn",
 ]
 
@@ -3041,18 +2901,17 @@ checksum = "89ca545a94061b6365f2c7355b4b32bd20df3ff95f02da9329b34ccc3bd6ee72"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.16",
+ "syn 2.0.29",
 ]
 
 [[package]]
 name = "futures-rustls"
-version = "0.22.2"
+version = "0.24.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d2411eed028cdf8c8034eaf21f9915f956b6c3abec4d4c7949ee67f0721127bd"
+checksum = "35bd3cf68c183738046838e300353e4716c674dc5e56890de4826801a6622a28"
 dependencies = [
  "futures-io",
- "rustls 0.20.8",
- "webpki 0.22.0",
+ "rustls 0.21.6",
 ]
 
 [[package]]
@@ -3067,6 +2926,17 @@ version = "0.3.28"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "76d3d132be6c0e6aa1534069c705a74a5997a356c0dc2f86a47765e5617c5b65"
 
+[[package]]
+name = "futures-ticker"
+version = "0.0.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9763058047f713632a52e916cc7f6a4b3fc6e9fc1ff8c5b1dc49e5a89041682e"
+dependencies = [
+ "futures",
+ "futures-timer",
+ "instant",
+]
+
 [[package]]
 name = "futures-timer"
 version = "3.0.2"
@@ -3086,7 +2956,7 @@ dependencies = [
  "futures-sink",
  "futures-task",
  "memchr",
- "pin-project-lite 0.2.9",
+ "pin-project-lite 0.2.12",
  "pin-utils",
  "slab",
 ]
@@ -3147,9 +3017,9 @@ dependencies = [
 
 [[package]]
 name = "getrandom"
-version = "0.2.9"
+version = "0.2.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c85e1d9ab2eadba7e5040d4e09cbd6d072b76a557ad64e797c2cb9d4da21d7e4"
+checksum = "be4136b2a15dd319360be1c07d9933517ccf0be8f16bf62a3bee4f0d618df427"
 dependencies = [
  "cfg-if",
  "js-sys",
@@ -3165,24 +3035,14 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1583cc1656d7839fd3732b80cf4f38850336cdb9b8ded1cd399ca62958de3c99"
 dependencies = [
  "opaque-debug",
- "polyval 0.5.3",
-]
-
-[[package]]
-name = "ghash"
-version = "0.5.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d930750de5717d2dd0b8c0d42c076c0e884c81a73e6cab859bbd2339c71e3e40"
-dependencies = [
- "opaque-debug",
- "polyval 0.6.0",
+ "polyval",
 ]
 
 [[package]]
 name = "gimli"
-version = "0.27.2"
+version = "0.27.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ad0a93d233ebf96623465aad4046a8d3aa4da22d4f4beba5388838c8a434bbb4"
+checksum = "b6c80984affa11d98d1b88b66ac8853f143217b399d3c74116778ff8fdb4ed2e"
 
 [[package]]
 name = "git-version"
@@ -3236,9 +3096,9 @@ dependencies = [
 
 [[package]]
 name = "h2"
-version = "0.3.19"
+version = "0.3.20"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d357c7ae988e7d2182f7d7871d0b963962420b0678b0997ce7de72001aeab782"
+checksum = "97ec8491ebaf99c8eaa73058b045fe58073cd6be7f596ac993ced0b0a0c01049"
 dependencies = [
  "bytes",
  "fnv",
@@ -3246,7 +3106,7 @@ dependencies = [
  "futures-sink",
  "futures-util",
  "http",
- "indexmap",
+ "indexmap 1.9.3",
  "slab",
  "tokio",
  "tokio-util 0.7.8",
@@ -3301,6 +3161,16 @@ dependencies = [
  "ahash 0.8.3",
 ]
 
+[[package]]
+name = "hashbrown"
+version = "0.14.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2c6201b9ff9fd90a5a3bac2e56a830d0caa509576f0e503818ee82c181b3437a"
+dependencies = [
+ "ahash 0.8.3",
+ "allocator-api2",
+]
+
 [[package]]
 name = "hashers"
 version = "1.0.1"
@@ -3321,11 +3191,11 @@ dependencies = [
 
 [[package]]
 name = "hashlink"
-version = "0.8.2"
+version = "0.8.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0761a1b9491c4f2e3d66aa0f62d0fba0af9a0e2852e4d48ea506632a4b56e6aa"
+checksum = "312f66718a2d7789ffef4f4b7b213138ed9f1eb3aa1d0d82fc99f88fb3ffd26f"
 dependencies = [
- "hashbrown 0.13.2",
+ "hashbrown 0.14.0",
 ]
 
 [[package]]
@@ -3335,7 +3205,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f3e372db8e5c0d213e0cd0b9be18be2aca3d44cf2fe30a9d46a65581cd454584"
 dependencies = [
  "base64 0.13.1",
- "bitflags",
+ "bitflags 1.3.2",
  "bytes",
  "headers-core",
  "http",
@@ -3370,18 +3240,9 @@ dependencies = [
 
 [[package]]
 name = "hermit-abi"
-version = "0.2.6"
+version = "0.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ee512640fe35acbfb4bb779db6f0d80704c2cacfa2e39b601ef3e3f47d1ae4c7"
-dependencies = [
- "libc",
-]
-
-[[package]]
-name = "hermit-abi"
-version = "0.3.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fed44880c466736ef9a5c5b5facefb5ed0785676d0c02d612db14e54f0d84286"
+checksum = "443144c8cdadd93ebf52ddb4056d257f5b52c04d3c804e657d19eb73fc33668b"
 
 [[package]]
 name = "hex"
@@ -3474,21 +3335,17 @@ checksum = "d5f38f16d184e36f2408a55281cd658ecbd3ca05cce6d6510a176eca393e26d1"
 dependencies = [
  "bytes",
  "http",
- "pin-project-lite 0.2.9",
+ "pin-project-lite 0.2.12",
 ]
 
-[[package]]
-name = "http-range-header"
-version = "0.3.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0bfe8eed0a9285ef776bb792479ea3834e8b94e13d615c2f66d03dd50a435a29"
-
 [[package]]
 name = "http_api"
 version = "0.1.0"
 dependencies = [
  "beacon_chain",
- "bs58",
+ "beacon_processor",
+ "bs58 0.4.0",
+ "bytes",
  "directory",
  "environment",
  "eth1",
@@ -3558,9 +3415,9 @@ checksum = "d897f394bad6a705d5f4104762e116a75639e470d80901eed05a860a95cb1904"
 
 [[package]]
 name = "httpdate"
-version = "1.0.2"
+version = "1.0.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c4a1e36c821dbe04574f602848a19f742f4fb3c98d40449f11bcad18d6b17421"
+checksum = "df3b46402a9d5adb4c86a0cf463f42e19994e3ee891101b1841f30a545cb49a9"
 
 [[package]]
 name = "humantime"
@@ -3570,9 +3427,9 @@ checksum = "9a3a5bfb195931eeb336b2a7b4d761daec841b97f947d34394601737a7bba5e4"
 
 [[package]]
 name = "hyper"
-version = "0.14.26"
+version = "0.14.27"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ab302d72a6f11a3b910431ff93aae7e773078c769f0a3ef15fb9ec692ed147d4"
+checksum = "ffb1cfd654a8219eaef89881fdb3bb3b1cdc5fa75ded05d6933b2b382e395468"
 dependencies = [
  "bytes",
  "futures-channel",
@@ -3584,7 +3441,7 @@ dependencies = [
  "httparse",
  "httpdate",
  "itoa",
- "pin-project-lite 0.2.9",
+ "pin-project-lite 0.2.12",
  "socket2 0.4.9",
  "tokio",
  "tower-service",
@@ -3594,15 +3451,16 @@ dependencies = [
 
 [[package]]
 name = "hyper-rustls"
-version = "0.24.0"
+version = "0.24.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0646026eb1b3eea4cd9ba47912ea5ce9cc07713d105b1a14698f4e6433d348b7"
+checksum = "8d78e1e73ec14cf7375674f74d7dde185c8206fd9dea6fb6295e8a98098aaa97"
 dependencies = [
+ "futures-util",
  "http",
  "hyper",
- "rustls 0.21.1",
+ "rustls 0.21.6",
  "tokio",
- "tokio-rustls 0.24.0",
+ "tokio-rustls 0.24.1",
 ]
 
 [[package]]
@@ -3620,9 +3478,9 @@ dependencies = [
 
 [[package]]
 name = "iana-time-zone"
-version = "0.1.56"
+version = "0.1.57"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0722cd7114b7de04316e7ea5456a0bbb20e4adb46fd27a3697adb812cff0f37c"
+checksum = "2fad5b825842d2b38bd206f3e81d6957625fd7f0a361e345c30e01a0ae2dd613"
 dependencies = [
  "android_system_properties",
  "core-foundation-sys",
@@ -3660,9 +3518,9 @@ dependencies = [
 
 [[package]]
 name = "idna"
-version = "0.3.0"
+version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e14ddfc70884202db2244c223200c204c2bda1bc6e0998d11b5e024d657209e6"
+checksum = "7d20d6b07bfbc108882d88ed8e37d39636dcc260e15e30c45e6ba089610b917c"
 dependencies = [
  "unicode-bidi",
  "unicode-normalization",
@@ -3746,7 +3604,7 @@ version = "0.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ba6a270039626615617f3f36d15fc827041df3b78c439da2cadfa47455a77f2f"
 dependencies = [
- "parity-scale-codec 3.5.0",
+ "parity-scale-codec 3.6.4",
 ]
 
 [[package]]
@@ -3803,6 +3661,16 @@ dependencies = [
  "hashbrown 0.12.3",
 ]
 
+[[package]]
+name = "indexmap"
+version = "2.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d5477fe2230a79769d8dc68e0eabf5437907c0457a5614a9e8dddb67f65eb65d"
+dependencies = [
+ "equivalent",
+ "hashbrown 0.14.0",
+]
+
 [[package]]
 name = "inout"
 version = "0.1.3"
@@ -3842,53 +3710,34 @@ dependencies = [
  "num-traits",
 ]
 
-[[package]]
-name = "interceptor"
-version = "0.8.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1e8a11ae2da61704edada656798b61c94b35ecac2c58eb955156987d5e6be90b"
-dependencies = [
- "async-trait",
- "bytes",
- "log",
- "rand 0.8.5",
- "rtcp",
- "rtp",
- "thiserror",
- "tokio",
- "waitgroup",
- "webrtc-srtp",
- "webrtc-util",
-]
-
 [[package]]
 name = "io-lifetimes"
-version = "1.0.10"
+version = "1.0.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9c66c74d2ae7e79a5a8f7ac924adbe38ee42a859c6539ad869eb51f0b52dc220"
+checksum = "eae7b9aee968036d54dce06cebaefd919e4472e753296daccd6d344e3e2df0c2"
 dependencies = [
- "hermit-abi 0.3.1",
+ "hermit-abi 0.3.2",
  "libc",
  "windows-sys 0.48.0",
 ]
 
 [[package]]
 name = "ipconfig"
-version = "0.3.1"
+version = "0.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bd302af1b90f2463a98fa5ad469fc212c8e3175a41c3068601bfa2727591c5be"
+checksum = "b58db92f96b720de98181bbbe63c831e87005ab460c1bf306eb2622b4707997f"
 dependencies = [
- "socket2 0.4.9",
- "widestring 0.5.1",
- "winapi",
- "winreg",
+ "socket2 0.5.3",
+ "widestring 1.0.2",
+ "windows-sys 0.48.0",
+ "winreg 0.50.0",
 ]
 
 [[package]]
 name = "ipnet"
-version = "2.7.2"
+version = "2.8.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "12b6ee2129af8d4fb011108c73d99a1b83a85977f23b82460c0ae2e25bb4b57f"
+checksum = "28b29a3cd74f0f4598934efe3aeba42bae0eb4680554128851ebbecb02af14e6"
 
 [[package]]
 name = "itertools"
@@ -3901,15 +3750,15 @@ dependencies = [
 
 [[package]]
 name = "itoa"
-version = "1.0.6"
+version = "1.0.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "453ad9f582a441959e5f0d088b02ce04cfe8d51a8eaf077f12ac6d3e94164ca6"
+checksum = "af150ab688ff2122fcef229be89cb50dd66af9e01a4ff320cc137eecc9bacc38"
 
 [[package]]
 name = "jemalloc-ctl"
-version = "0.5.0"
+version = "0.5.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c1891c671f3db85d8ea8525dd43ab147f9977041911d24a03e5a36187a7bfde9"
+checksum = "7cffc705424a344c054e135d12ee591402f4539245e8bbd64e6c9eaa9458b63c"
 dependencies = [
  "jemalloc-sys",
  "libc",
@@ -3918,9 +3767,9 @@ dependencies = [
 
 [[package]]
 name = "jemalloc-sys"
-version = "0.5.3+5.3.0-patched"
+version = "0.5.4+5.3.0-patched"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f9bd5d616ea7ed58b571b2e209a65759664d7fb021a0819d7a790afc67e47ca1"
+checksum = "ac6c1946e1cea1788cbfde01c993b52a10e2da07f4bac608228d1bed20bfebf2"
 dependencies = [
  "cc",
  "libc",
@@ -3928,19 +3777,28 @@ dependencies = [
 
 [[package]]
 name = "jemallocator"
-version = "0.5.0"
+version = "0.5.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "16c2514137880c52b0b4822b563fadd38257c1f380858addb74a400889696ea6"
+checksum = "a0de374a9f8e63150e6f5e8a60cc14c668226d7a347d8aee1a45766e3c4dd3bc"
 dependencies = [
  "jemalloc-sys",
  "libc",
 ]
 
 [[package]]
-name = "js-sys"
-version = "0.3.63"
+name = "jobserver"
+version = "0.1.26"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2f37a4a5928311ac501dee68b3c7613a1037d0edb30c8e5427bd832d55d1b790"
+checksum = "936cfd212a0155903bcbc060e316fb6cc7cbf2e1907329391ebadc1fe0ce77c2"
+dependencies = [
+ "libc",
+]
+
+[[package]]
+name = "js-sys"
+version = "0.3.64"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c5f195fe497f702db0f318b07fdd68edb16955aed830df8363d837542f8f935a"
 dependencies = [
  "wasm-bindgen",
 ]
@@ -3951,7 +3809,7 @@ version = "8.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6971da4d9c3aa03c3d8f3ff0f4155b534aad021292003895a469716b2a230378"
 dependencies = [
- "base64 0.21.1",
+ "base64 0.21.2",
  "pem",
  "ring",
  "serde",
@@ -3968,7 +3826,7 @@ dependencies = [
  "cfg-if",
  "ecdsa 0.14.8",
  "elliptic-curve 0.12.3",
- "sha2 0.10.6",
+ "sha2 0.10.7",
  "sha3 0.10.8",
 ]
 
@@ -3979,10 +3837,10 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "cadb76004ed8e97623117f3df85b17aaa6626ab0b0831e6573f104df16cd1bcc"
 dependencies = [
  "cfg-if",
- "ecdsa 0.16.7",
+ "ecdsa 0.16.8",
  "elliptic-curve 0.13.5",
  "once_cell",
- "sha2 0.10.6",
+ "sha2 0.10.7",
  "signature 2.1.0",
 ]
 
@@ -4011,7 +3869,7 @@ version = "1.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e2abad23fbc42b3700f2f279844dc832adb2b2eb069b2df918f455c4e18cc646"
 dependencies = [
- "spin",
+ "spin 0.5.2",
 ]
 
 [[package]]
@@ -4022,7 +3880,7 @@ checksum = "830d08ce1d1d941e6b30645f1a0eb5643013d835ce3779a5fc208261dbe10f55"
 
 [[package]]
 name = "lcli"
-version = "4.3.0"
+version = "4.4.1"
 dependencies = [
  "account_utils",
  "beacon_chain",
@@ -4083,9 +3941,9 @@ dependencies = [
 
 [[package]]
 name = "libc"
-version = "0.2.144"
+version = "0.2.147"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2b00cc1c228a6782d0f076e7b232802e0c5689d41bb5df366f2a6b6621cfdfe1"
+checksum = "b4668fb0ea861c1df094127ac5f1da3409a82116a4ba74fca2e58ef927159bb3"
 
 [[package]]
 name = "libflate"
@@ -4117,12 +3975,6 @@ dependencies = [
  "winapi",
 ]
 
-[[package]]
-name = "libm"
-version = "0.1.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7fc7aa29613bd6a620df431842069224d8bc9011086b1db4c0e0cd47fa03ec9a"
-
 [[package]]
 name = "libm"
 version = "0.2.7"
@@ -4134,10 +3986,10 @@ name = "libmdbx"
 version = "0.1.4"
 source = "git+https://github.com/sigp/libmdbx-rs?tag=v0.1.4#096da80a83d14343f8df833006483f48075cd135"
 dependencies = [
- "bitflags",
+ "bitflags 1.3.2",
  "byteorder",
  "derive_more",
- "indexmap",
+ "indexmap 1.9.3",
  "libc",
  "mdbx-sys",
  "parking_lot 0.12.1",
@@ -4146,112 +3998,64 @@ dependencies = [
 
 [[package]]
 name = "libp2p"
-version = "0.50.1"
+version = "0.52.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9c7b0104790be871edcf97db9bd2356604984e623a08d825c3f27852290266b8"
+checksum = "32d07d1502a027366d55afe187621c2d7895dc111a3df13b35fed698049681d7"
 dependencies = [
  "bytes",
  "futures",
  "futures-timer",
- "getrandom 0.2.9",
+ "getrandom 0.2.10",
  "instant",
- "libp2p-core 0.38.0",
+ "libp2p-allow-block-list",
+ "libp2p-connection-limits",
+ "libp2p-core",
  "libp2p-dns",
  "libp2p-gossipsub",
  "libp2p-identify",
+ "libp2p-identity",
  "libp2p-mdns",
  "libp2p-metrics",
- "libp2p-mplex",
  "libp2p-noise",
  "libp2p-plaintext",
  "libp2p-quic",
  "libp2p-swarm",
  "libp2p-tcp",
- "libp2p-webrtc",
  "libp2p-websocket",
  "libp2p-yamux",
- "multiaddr 0.16.0",
- "parking_lot 0.12.1",
+ "multiaddr 0.18.0",
  "pin-project",
- "smallvec",
 ]
 
 [[package]]
-name = "libp2p-core"
-version = "0.36.0"
+name = "libp2p-allow-block-list"
+version = "0.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b1fff5bd889c82a0aec668f2045edd066f559d4e5c40354e5a4c77ac00caac38"
+checksum = "55b46558c5c0bf99d3e2a1a38fd54ff5476ca66dd1737b12466a1824dd219311"
 dependencies = [
- "asn1_der",
- "bs58",
- "ed25519-dalek 1.0.1",
- "either",
- "fnv",
- "futures",
- "futures-timer",
- "instant",
- "lazy_static",
- "libsecp256k1",
- "log",
- "multiaddr 0.14.0",
- "multihash 0.16.3",
- "multistream-select 0.11.0",
- "p256",
- "parking_lot 0.12.1",
- "pin-project",
- "prost",
- "prost-build",
- "rand 0.8.5",
- "rw-stream-sink",
- "sha2 0.10.6",
- "smallvec",
- "thiserror",
- "unsigned-varint 0.7.1",
+ "libp2p-core",
+ "libp2p-identity",
+ "libp2p-swarm",
  "void",
- "zeroize",
 ]
 
 [[package]]
-name = "libp2p-core"
-version = "0.38.0"
+name = "libp2p-connection-limits"
+version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b6a8fcd392ff67af6cc3f03b1426c41f7f26b6b9aff2dc632c1c56dd649e571f"
+checksum = "2f5107ad45cb20b2f6c3628c7b6014b996fcb13a88053f4569c872c6e30abf58"
 dependencies = [
- "asn1_der",
- "bs58",
- "ed25519-dalek 1.0.1",
- "either",
- "fnv",
- "futures",
- "futures-timer",
- "instant",
- "libsecp256k1",
- "log",
- "multiaddr 0.16.0",
- "multihash 0.16.3",
- "multistream-select 0.12.1",
- "once_cell",
- "p256",
- "parking_lot 0.12.1",
- "pin-project",
- "prost",
- "prost-build",
- "rand 0.8.5",
- "rw-stream-sink",
- "sec1 0.3.0",
- "sha2 0.10.6",
- "smallvec",
- "thiserror",
- "unsigned-varint 0.7.1",
+ "libp2p-core",
+ "libp2p-identity",
+ "libp2p-swarm",
  "void",
- "zeroize",
 ]
 
 [[package]]
 name = "libp2p-core"
-version = "0.39.2"
+version = "0.40.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3c1df63c0b582aa434fb09b2d86897fa2b419ffeccf934b36f87fcedc8e835c2"
+checksum = "ef7dd7b09e71aac9271c60031d0e558966cdb3253ba0308ab369bb2de80630d0"
 dependencies = [
  "either",
  "fnv",
@@ -4260,16 +4064,16 @@ dependencies = [
  "instant",
  "libp2p-identity",
  "log",
- "multiaddr 0.17.1",
- "multihash 0.17.0",
- "multistream-select 0.12.1",
+ "multiaddr 0.18.0",
+ "multihash 0.19.0",
+ "multistream-select",
  "once_cell",
  "parking_lot 0.12.1",
  "pin-project",
  "quick-protobuf",
  "rand 0.8.5",
  "rw-stream-sink",
- "smallvec",
+ "smallvec 1.11.0",
  "thiserror",
  "unsigned-varint 0.7.1",
  "void",
@@ -4277,102 +4081,111 @@ dependencies = [
 
 [[package]]
 name = "libp2p-dns"
-version = "0.38.0"
+version = "0.40.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8e42a271c1b49f789b92f7fc87749fa79ce5c7bdc88cbdfacb818a4bca47fec5"
+checksum = "fd4394c81c0c06d7b4a60f3face7e8e8a9b246840f98d2c80508d0721b032147"
 dependencies = [
  "futures",
- "libp2p-core 0.38.0",
+ "libp2p-core",
+ "libp2p-identity",
  "log",
  "parking_lot 0.12.1",
- "smallvec",
+ "smallvec 1.11.0",
  "trust-dns-resolver",
 ]
 
 [[package]]
 name = "libp2p-gossipsub"
-version = "0.43.0"
+version = "0.45.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a173171c71c29bb156f98886c7c4824596de3903dadf01e2e79d2ccdcf38cd9f"
+checksum = "2d157562dba6017193e5285acf6b1054759e83540bfd79f75b69d6ce774c88da"
 dependencies = [
  "asynchronous-codec",
- "base64 0.13.1",
+ "base64 0.21.2",
  "byteorder",
  "bytes",
+ "either",
  "fnv",
  "futures",
+ "futures-ticker",
+ "getrandom 0.2.10",
  "hex_fmt",
  "instant",
- "libp2p-core 0.38.0",
+ "libp2p-core",
+ "libp2p-identity",
  "libp2p-swarm",
  "log",
  "prometheus-client",
- "prost",
- "prost-build",
- "prost-codec",
+ "quick-protobuf",
+ "quick-protobuf-codec",
  "rand 0.8.5",
  "regex",
- "sha2 0.10.6",
- "smallvec",
- "thiserror",
+ "sha2 0.10.7",
+ "smallvec 1.11.0",
  "unsigned-varint 0.7.1",
- "wasm-timer",
+ "void",
 ]
 
 [[package]]
 name = "libp2p-identify"
-version = "0.41.1"
+version = "0.43.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c052d0026f4817b44869bfb6810f4e1112f43aec8553f2cb38881c524b563abf"
+checksum = "6a29675a32dbcc87790db6cf599709e64308f1ae9d5ecea2d259155889982db8"
 dependencies = [
  "asynchronous-codec",
+ "either",
  "futures",
  "futures-timer",
- "libp2p-core 0.38.0",
+ "libp2p-core",
+ "libp2p-identity",
  "libp2p-swarm",
  "log",
- "lru 0.8.1",
- "prost",
- "prost-build",
- "prost-codec",
- "smallvec",
+ "lru 0.10.1",
+ "quick-protobuf",
+ "quick-protobuf-codec",
+ "smallvec 1.11.0",
  "thiserror",
  "void",
 ]
 
 [[package]]
 name = "libp2p-identity"
-version = "0.1.2"
+version = "0.2.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9e2d584751cecb2aabaa56106be6be91338a60a0f4e420cf2af639204f596fc1"
+checksum = "686e73aff5e23efbb99bc85340ea6fd8686986aa7b283a881ba182cfca535ca9"
 dependencies = [
- "bs58",
- "ed25519-dalek 1.0.1",
+ "asn1_der",
+ "bs58 0.5.0",
+ "ed25519-dalek",
+ "libsecp256k1",
  "log",
- "multiaddr 0.17.1",
- "multihash 0.17.0",
+ "multihash 0.19.0",
+ "p256",
  "quick-protobuf",
  "rand 0.8.5",
- "sha2 0.10.6",
+ "sec1 0.7.3",
+ "sha2 0.10.7",
  "thiserror",
+ "void",
  "zeroize",
 ]
 
 [[package]]
 name = "libp2p-mdns"
-version = "0.42.0"
+version = "0.44.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "04f378264aade9872d6ccd315c0accc18be3a35d15fc1b9c36e5b6f983b62b5b"
+checksum = "42a2567c305232f5ef54185e9604579a894fd0674819402bb0ac0246da82f52a"
 dependencies = [
  "data-encoding",
  "futures",
  "if-watch",
- "libp2p-core 0.38.0",
+ "libp2p-core",
+ "libp2p-identity",
  "libp2p-swarm",
  "log",
  "rand 0.8.5",
- "smallvec",
- "socket2 0.4.9",
+ "smallvec 1.11.0",
+ "socket2 0.5.3",
  "tokio",
  "trust-dns-proto",
  "void",
@@ -4380,224 +4193,204 @@ dependencies = [
 
 [[package]]
 name = "libp2p-metrics"
-version = "0.11.0"
+version = "0.13.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5ad8a64f29da86005c86a4d2728b8a0719e9b192f4092b609fd8790acb9dec55"
+checksum = "239ba7d28f8d0b5d77760dc6619c05c7e88e74ec8fbbe97f856f20a56745e620"
 dependencies = [
- "libp2p-core 0.38.0",
+ "instant",
+ "libp2p-core",
  "libp2p-gossipsub",
  "libp2p-identify",
+ "libp2p-identity",
  "libp2p-swarm",
+ "once_cell",
  "prometheus-client",
 ]
 
 [[package]]
 name = "libp2p-mplex"
-version = "0.38.0"
+version = "0.40.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "03805b44107aa013e7cbbfa5627b31c36cbedfdfb00603c0311998882bc4bace"
+checksum = "93959ed08b6caf9810e067655e25f1362098797fef7c44d3103e63dcb6f0fabe"
 dependencies = [
  "asynchronous-codec",
  "bytes",
  "futures",
- "libp2p-core 0.38.0",
+ "libp2p-core",
+ "libp2p-identity",
  "log",
  "nohash-hasher",
  "parking_lot 0.12.1",
  "rand 0.8.5",
- "smallvec",
+ "smallvec 1.11.0",
  "unsigned-varint 0.7.1",
 ]
 
 [[package]]
 name = "libp2p-noise"
-version = "0.41.0"
+version = "0.43.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a978cb57efe82e892ec6f348a536bfbd9fee677adbe5689d7a93ad3a9bffbf2e"
+checksum = "71ce70757f2c0d82e9a3ef738fb10ea0723d16cec37f078f719e2c247704c1bb"
 dependencies = [
  "bytes",
- "curve25519-dalek 3.2.0",
+ "curve25519-dalek 4.0.0",
  "futures",
- "libp2p-core 0.38.0",
+ "libp2p-core",
+ "libp2p-identity",
  "log",
+ "multiaddr 0.18.0",
+ "multihash 0.19.0",
  "once_cell",
- "prost",
- "prost-build",
+ "quick-protobuf",
  "rand 0.8.5",
- "sha2 0.10.6",
+ "sha2 0.10.7",
  "snow",
  "static_assertions",
  "thiserror",
- "x25519-dalek 1.1.1",
+ "x25519-dalek",
  "zeroize",
 ]
 
 [[package]]
 name = "libp2p-plaintext"
-version = "0.38.0"
+version = "0.40.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4c43ab37fb4102682ae9a248dc2e6a8e7b941ec75cf24aed103060a788e0fd15"
+checksum = "37266c683a757df713f7dcda0cdcb5ad4681355ffa1b37b77c113c176a531195"
 dependencies = [
  "asynchronous-codec",
  "bytes",
  "futures",
- "libp2p-core 0.38.0",
+ "libp2p-core",
+ "libp2p-identity",
  "log",
- "prost",
- "prost-build",
+ "quick-protobuf",
  "unsigned-varint 0.7.1",
- "void",
 ]
 
 [[package]]
 name = "libp2p-quic"
-version = "0.7.0-alpha"
+version = "0.9.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "01e7c867e95c8130667b24409d236d37598270e6da69b3baf54213ba31ffca59"
+checksum = "4cb763e88f9a043546bfebd3575f340e7dd3d6c1b2cf2629600ec8965360c63a"
 dependencies = [
  "bytes",
  "futures",
  "futures-timer",
  "if-watch",
- "libp2p-core 0.38.0",
+ "libp2p-core",
+ "libp2p-identity",
  "libp2p-tls",
  "log",
  "parking_lot 0.12.1",
- "quinn-proto",
+ "quinn",
  "rand 0.8.5",
- "rustls 0.20.8",
+ "rustls 0.21.6",
+ "socket2 0.5.3",
  "thiserror",
  "tokio",
 ]
 
 [[package]]
 name = "libp2p-swarm"
-version = "0.41.1"
+version = "0.43.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b2a35472fe3276b3855c00f1c032ea8413615e030256429ad5349cdf67c6e1a0"
+checksum = "28016944851bd73526d3c146aabf0fa9bbe27c558f080f9e5447da3a1772c01a"
 dependencies = [
  "either",
  "fnv",
  "futures",
  "futures-timer",
  "instant",
- "libp2p-core 0.38.0",
+ "libp2p-core",
+ "libp2p-identity",
  "libp2p-swarm-derive",
  "log",
- "pin-project",
+ "multistream-select",
+ "once_cell",
  "rand 0.8.5",
- "smallvec",
- "thiserror",
+ "smallvec 1.11.0",
  "tokio",
  "void",
 ]
 
 [[package]]
 name = "libp2p-swarm-derive"
-version = "0.31.0"
+version = "0.33.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9d527d5827582abd44a6d80c07ff8b50b4ee238a8979e05998474179e79dc400"
+checksum = "c4d5ec2a3df00c7836d7696c136274c9c59705bac69133253696a6c932cd1d74"
 dependencies = [
  "heck",
+ "proc-macro-warning",
+ "proc-macro2",
  "quote",
- "syn 1.0.109",
+ "syn 2.0.29",
 ]
 
 [[package]]
 name = "libp2p-tcp"
-version = "0.38.0"
+version = "0.40.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b4b257baf6df8f2df39678b86c578961d48cc8b68642a12f0f763f56c8e5858d"
+checksum = "09bfdfb6f945c5c014b87872a0bdb6e0aef90e92f380ef57cd9013f118f9289d"
 dependencies = [
  "futures",
  "futures-timer",
  "if-watch",
  "libc",
- "libp2p-core 0.38.0",
+ "libp2p-core",
+ "libp2p-identity",
  "log",
- "socket2 0.4.9",
+ "socket2 0.5.3",
  "tokio",
 ]
 
 [[package]]
 name = "libp2p-tls"
-version = "0.1.0"
+version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ff08d13d0dc66e5e9ba6279c1de417b84fa0d0adc3b03e5732928c180ec02781"
+checksum = "8218d1d5482b122ccae396bbf38abdcb283ecc96fa54760e1dfd251f0546ac61"
 dependencies = [
  "futures",
  "futures-rustls",
- "libp2p-core 0.39.2",
+ "libp2p-core",
  "libp2p-identity",
- "rcgen 0.10.0",
+ "rcgen",
  "ring",
- "rustls 0.20.8",
+ "rustls 0.21.6",
+ "rustls-webpki",
  "thiserror",
- "webpki 0.22.0",
- "x509-parser 0.14.0",
+ "x509-parser",
  "yasna",
 ]
 
-[[package]]
-name = "libp2p-webrtc"
-version = "0.4.0-alpha"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cdb6cd86dd68cba72308ea05de1cebf3ba0ae6e187c40548167955d4e3970f6a"
-dependencies = [
- "async-trait",
- "asynchronous-codec",
- "bytes",
- "futures",
- "futures-timer",
- "hex",
- "if-watch",
- "libp2p-core 0.38.0",
- "libp2p-noise",
- "log",
- "multihash 0.16.3",
- "prost",
- "prost-build",
- "prost-codec",
- "rand 0.8.5",
- "rcgen 0.9.3",
- "serde",
- "stun",
- "thiserror",
- "tinytemplate",
- "tokio",
- "tokio-util 0.7.8",
- "webrtc",
-]
-
 [[package]]
 name = "libp2p-websocket"
-version = "0.40.0"
+version = "0.42.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1d705506030d5c0aaf2882437c70dab437605f21c5f9811978f694e6917a3b54"
+checksum = "3facf0691bab65f571bc97c6c65ffa836248ca631d631b7691ac91deb7fceb5f"
 dependencies = [
  "either",
  "futures",
  "futures-rustls",
- "libp2p-core 0.38.0",
+ "libp2p-core",
+ "libp2p-identity",
  "log",
  "parking_lot 0.12.1",
  "quicksink",
  "rw-stream-sink",
  "soketto",
  "url",
- "webpki-roots",
+ "webpki-roots 0.25.2",
 ]
 
 [[package]]
 name = "libp2p-yamux"
-version = "0.42.0"
+version = "0.44.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4f63594a0aa818642d9d4915c791945053877253f08a3626f13416b5cd928a29"
+checksum = "8eedcb62824c4300efb9cfd4e2a6edaf3ca097b9e68b36dabe45a44469fd6a85"
 dependencies = [
  "futures",
- "libp2p-core 0.38.0",
+ "libp2p-core",
  "log",
- "parking_lot 0.12.1",
  "thiserror",
  "yamux",
 ]
@@ -4663,9 +4456,9 @@ dependencies = [
 
 [[package]]
 name = "libz-sys"
-version = "1.1.9"
+version = "1.1.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "56ee889ecc9568871456d42f603d6a0ce59ff328d291063a45cbdf0036baf6db"
+checksum = "d97137b25e321a73eef1418d1d5d2eda4d77e12813f8e6dead84bc52c5870a7b"
 dependencies = [
  "cc",
  "pkg-config",
@@ -4674,11 +4467,12 @@ dependencies = [
 
 [[package]]
 name = "lighthouse"
-version = "4.3.0"
+version = "4.4.1"
 dependencies = [
  "account_manager",
  "account_utils",
  "beacon_node",
+ "beacon_processor",
  "bls",
  "boot_node",
  "clap",
@@ -4688,6 +4482,7 @@ dependencies = [
  "env_logger 0.9.3",
  "environment",
  "eth1",
+ "eth2",
  "eth2_network_config",
  "ethereum_hashing",
  "futures",
@@ -4710,6 +4505,7 @@ dependencies = [
  "unused_port",
  "validator_client",
  "validator_dir",
+ "validator_manager",
 ]
 
 [[package]]
@@ -4737,6 +4533,7 @@ dependencies = [
  "hex",
  "lazy_static",
  "libp2p",
+ "libp2p-mplex",
  "lighthouse_metrics",
  "lighthouse_version",
  "lru 0.7.8",
@@ -4749,11 +4546,11 @@ dependencies = [
  "regex",
  "serde",
  "serde_derive",
- "sha2 0.10.6",
+ "sha2 0.10.7",
  "slog",
  "slog-async",
  "slog-term",
- "smallvec",
+ "smallvec 1.11.0",
  "snap",
  "ssz_types",
  "strum",
@@ -4787,18 +4584,30 @@ version = "0.5.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0717cef1bc8b636c6e1c1bbdefc09e6322da8a9321966e8928ef80d20f7f770f"
 
+[[package]]
+name = "linux-raw-sys"
+version = "0.1.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f051f77a7c8e6957c0696eac88f26b0117e54f52d3fc682ab19397a8812846a4"
+
 [[package]]
 name = "linux-raw-sys"
 version = "0.3.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ef53942eb7bf7ff43a617b3e2c1c4a5ecf5944a7c1bc12d7ee39bbb15e5c1519"
 
+[[package]]
+name = "linux-raw-sys"
+version = "0.4.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "57bcfdad1b858c2db7c38303a6d2ad4dfaf5eb53dfeb0910128b2c26d6158503"
+
 [[package]]
 name = "lmdb-rkv"
 version = "0.14.0"
 source = "git+https://github.com/sigp/lmdb-rs?rev=f33845c6469b94265319aac0ed5085597862c27e#f33845c6469b94265319aac0ed5085597862c27e"
 dependencies = [
- "bitflags",
+ "bitflags 1.3.2",
  "byteorder",
  "libc",
  "lmdb-rkv-sys",
@@ -4816,9 +4625,9 @@ dependencies = [
 
 [[package]]
 name = "lock_api"
-version = "0.4.9"
+version = "0.4.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "435011366fe56583b16cf956f9df0095b405b82d76425bc8981c0e22e60ec4df"
+checksum = "c1cc9717a20b1bb222f333e6a92fd32f7d8a18ddc5a3191a11af45dcbf4dcd16"
 dependencies = [
  "autocfg 1.1.0",
  "scopeguard",
@@ -4834,12 +4643,9 @@ dependencies = [
 
 [[package]]
 name = "log"
-version = "0.4.17"
+version = "0.4.20"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "abb12e687cfb44aa40f41fc3978ef76448f9b6038cad6aef4259d3c095a2382e"
-dependencies = [
- "cfg-if",
-]
+checksum = "b5e6163cb8c49088c2c36f57875e58ccd8c87c7427f7fbd50ea6710b2f3f2e8f"
 
 [[package]]
 name = "logging"
@@ -4870,11 +4676,11 @@ dependencies = [
 
 [[package]]
 name = "lru"
-version = "0.8.1"
+version = "0.10.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b6e8aaa3f231bb4bd57b84b2d5dc3ae7f350265df8aa96492e0bc394a1571909"
+checksum = "718e8fae447df0c7e1ba7f5189829e63fd536945c8988d61444c19039f16b670"
 dependencies = [
- "hashbrown 0.12.3",
+ "hashbrown 0.13.2",
 ]
 
 [[package]]
@@ -4932,7 +4738,7 @@ version = "0.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8263075bb86c5a1b1427b5ae862e8889656f126e9f77c484496e8b47cf5c5558"
 dependencies = [
- "regex-automata",
+ "regex-automata 0.1.10",
 ]
 
 [[package]]
@@ -4943,9 +4749,15 @@ checksum = "2532096657941c2fea9c289d370a250971c689d4f143798ff67113ec042024a5"
 
 [[package]]
 name = "matchit"
-version = "0.5.0"
+version = "0.7.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "73cbba799671b762df5a175adf59ce145165747bb891505c43d09aefbbf38beb"
+checksum = "ed1202b2a6f884ae56f04cff409ab315c5ce26b5e58d7412e484f01fd52f52ef"
+
+[[package]]
+name = "maybe-uninit"
+version = "2.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "60302e4db3a61da70c0cb7991976248362f30319e88850c487b9b95bbf059e00"
 
 [[package]]
 name = "md-5"
@@ -4969,9 +4781,9 @@ dependencies = [
 
 [[package]]
 name = "mediatype"
-version = "0.19.13"
+version = "0.19.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fea6e62614ab2fc0faa58bb15102a0382d368f896a9fa4776592589ab55c4de7"
+checksum = "8c408dc227d302f1496c84d9dc68c00fec6f56f9228a18f3023f976f3ca7c945"
 
 [[package]]
 name = "memchr"
@@ -4990,9 +4802,9 @@ dependencies = [
 
 [[package]]
 name = "memoffset"
-version = "0.8.0"
+version = "0.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d61c719bcfbcf5d62b3a09efa6088de8c54bc0bfcd3ea7ae39fcc186108b8de1"
+checksum = "5a634b1c61a95585bd15607c6ab0c4e5b226e695ff2800ba0cdccddf208c406c"
 dependencies = [
  "autocfg 1.1.0",
 ]
@@ -5011,39 +4823,43 @@ dependencies = [
 
 [[package]]
 name = "metastruct"
-version = "0.1.0"
+version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "734788dec2091fe9afa39530ca2ea7994f4a2c9aff3dbfebb63f2c1945c6f10b"
+checksum = "ccfbb8826226b09b05bb62a0937cf6abb16f1f7d4b746eb95a83db14aec60f06"
 dependencies = [
  "metastruct_macro",
 ]
 
 [[package]]
 name = "metastruct_macro"
-version = "0.1.0"
+version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "42ded15e7570c2a507a23e6c3a1c8d74507b779476e43afe93ddfc261d44173d"
+checksum = "37cb4045d5677b7da537f8cb5d0730d5b6414e3cc81c61e4b50e1f0cbdc73909"
 dependencies = [
- "darling 0.13.4",
+ "darling",
  "itertools",
  "proc-macro2",
  "quote",
- "smallvec",
+ "smallvec 1.11.0",
  "syn 1.0.109",
 ]
 
 [[package]]
 name = "mev-rs"
-version = "0.2.1"
-source = "git+https://github.com/ralexstokes//mev-rs?rev=7813d4a4a564e0754e9aaab2d95520ba437c3889#7813d4a4a564e0754e9aaab2d95520ba437c3889"
+version = "0.3.0"
+source = "git+https://github.com/ralexstokes/mev-rs?rev=216657016d5c0889b505857c89ae42c7aa2764af#216657016d5c0889b505857c89ae42c7aa2764af"
 dependencies = [
+ "anvil-rpc",
  "async-trait",
  "axum",
  "beacon-api-client",
  "ethereum-consensus",
  "hyper",
+ "parking_lot 0.12.1",
+ "reqwest",
  "serde",
- "ssz-rs",
+ "serde_json",
+ "ssz_rs",
  "thiserror",
  "tokio",
  "tracing",
@@ -5051,19 +4867,19 @@ dependencies = [
 
 [[package]]
 name = "migrations_internals"
-version = "2.0.0"
+version = "2.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c493c09323068c01e54c685f7da41a9ccf9219735c3766fbfd6099806ea08fbc"
+checksum = "0f23f71580015254b020e856feac3df5878c2c7a8812297edd6c0a485ac9dada"
 dependencies = [
  "serde",
- "toml",
+ "toml 0.7.6",
 ]
 
 [[package]]
 name = "migrations_macros"
-version = "2.0.0"
+version = "2.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8a8ff27a350511de30cdabb77147501c36ef02e0451d957abea2f30caffb2b58"
+checksum = "cce3325ac70e67bbab5bd837a31cae01f1a6db64e0e744a33cb03a543469ef08"
 dependencies = [
  "migrations_internals",
  "proc-macro2",
@@ -5104,15 +4920,6 @@ version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "68354c5c6bd36d73ff3feceb05efa59b6acb7626617f4962be322a825e61f79a"
 
-[[package]]
-name = "miniz_oxide"
-version = "0.6.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b275950c28b37e794e8c55d88aeb5e139d0ce23fdbbeda68f8d7174abdf9e8fa"
-dependencies = [
- "adler",
-]
-
 [[package]]
 name = "miniz_oxide"
 version = "0.7.1"
@@ -5124,14 +4931,13 @@ dependencies = [
 
 [[package]]
 name = "mio"
-version = "0.8.6"
+version = "0.8.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5b9d9a46eff5b4ff64b45a9e316a6d1e0bc719ef429cbec4dc630684212bfdf9"
+checksum = "927a765cd3fc26206e66b296465fa9d3e5ab003e651c1b3c060e7956d96b19d2"
 dependencies = [
  "libc",
- "log",
  "wasi 0.11.0+wasi-snapshot-preview1",
- "windows-sys 0.45.0",
+ "windows-sys 0.48.0",
 ]
 
 [[package]]
@@ -5160,6 +4966,24 @@ version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7843ec2de400bcbc6a6328c958dc38e5359da6e93e72e37bc5246bf1ae776389"
 
+[[package]]
+name = "multer"
+version = "2.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "01acbdc23469fd8fe07ab135923371d5f5a422fbf9c522158677c8eb15bc51c2"
+dependencies = [
+ "bytes",
+ "encoding_rs",
+ "futures-util",
+ "http",
+ "httparse",
+ "log",
+ "memchr",
+ "mime",
+ "spin 0.9.8",
+ "version_check",
+]
+
 [[package]]
 name = "multiaddr"
 version = "0.14.0"
@@ -5167,7 +4991,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3c580bfdd8803cce319b047d239559a22f809094aaea4ac13902a1fdcfcd4261"
 dependencies = [
  "arrayref",
- "bs58",
+ "bs58 0.4.0",
  "byteorder",
  "data-encoding",
  "multihash 0.16.3",
@@ -5180,34 +5004,16 @@ dependencies = [
 
 [[package]]
 name = "multiaddr"
-version = "0.16.0"
+version = "0.18.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a4aebdb21e90f81d13ed01dc84123320838e53963c2ca94b60b305d3fa64f31e"
+checksum = "92a651988b3ed3ad1bc8c87d016bb92f6f395b84ed1db9b926b32b1fc5a2c8b5"
 dependencies = [
  "arrayref",
  "byteorder",
  "data-encoding",
+ "libp2p-identity",
  "multibase",
- "multihash 0.16.3",
- "percent-encoding",
- "serde",
- "static_assertions",
- "unsigned-varint 0.7.1",
- "url",
-]
-
-[[package]]
-name = "multiaddr"
-version = "0.17.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2b36f567c7099511fa8612bbbb52dda2419ce0bdbacf31714e3a5ffdb766d3bd"
-dependencies = [
- "arrayref",
- "byteorder",
- "data-encoding",
- "log",
- "multibase",
- "multihash 0.17.0",
+ "multihash 0.19.0",
  "percent-encoding",
  "serde",
  "static_assertions",
@@ -5235,18 +5041,17 @@ dependencies = [
  "core2",
  "digest 0.10.7",
  "multihash-derive",
- "sha2 0.10.6",
+ "sha2 0.10.7",
  "unsigned-varint 0.7.1",
 ]
 
 [[package]]
 name = "multihash"
-version = "0.17.0"
+version = "0.19.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "835d6ff01d610179fbce3de1694d007e500bf33a7f29689838941d6bf783ae40"
+checksum = "2fd59dcc2bbe70baabeac52cd22ae52c55eefe6c38ff11a9439f16a350a939f2"
 dependencies = [
  "core2",
- "multihash-derive",
  "unsigned-varint 0.7.1",
 ]
 
@@ -5264,55 +5069,17 @@ dependencies = [
  "synstructure",
 ]
 
-[[package]]
-name = "multimap"
-version = "0.8.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e5ce46fe64a9d73be07dcbe690a38ce1b293be448fd8ce1e6c1b8062c9f72c6a"
-
-[[package]]
-name = "multipart"
-version = "0.18.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "00dec633863867f29cb39df64a397cdf4a6354708ddd7759f70c7fb51c5f9182"
-dependencies = [
- "buf_redux",
- "httparse",
- "log",
- "mime",
- "mime_guess",
- "quick-error",
- "rand 0.8.5",
- "safemem",
- "tempfile",
- "twoway",
-]
-
 [[package]]
 name = "multistream-select"
-version = "0.11.0"
+version = "0.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "363a84be6453a70e63513660f4894ef815daf88e3356bffcda9ca27d810ce83b"
+checksum = "ea0df8e5eec2298a62b326ee4f0d7fe1a6b90a09dfcf9df37b38f947a8c42f19"
 dependencies = [
  "bytes",
  "futures",
  "log",
  "pin-project",
- "smallvec",
- "unsigned-varint 0.7.1",
-]
-
-[[package]]
-name = "multistream-select"
-version = "0.12.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c8552ab875c1313b97b8d20cb857b9fd63e2d1d6a0a1b53ce9821e575405f27a"
-dependencies = [
- "bytes",
- "futures",
- "log",
- "pin-project",
- "smallvec",
+ "smallvec 1.11.0",
  "unsigned-varint 0.7.1",
 ]
 
@@ -5353,7 +5120,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d9ea4302b9759a7a88242299225ea3688e63c85ea136371bb6cf94fd674efaab"
 dependencies = [
  "anyhow",
- "bitflags",
+ "bitflags 1.3.2",
  "byteorder",
  "libc",
  "netlink-packet-core",
@@ -5405,6 +5172,7 @@ name = "network"
 version = "0.2.0"
 dependencies = [
  "beacon_chain",
+ "beacon_processor",
  "delay_map",
  "derivative",
  "environment",
@@ -5426,8 +5194,8 @@ dependencies = [
  "logging",
  "lru_cache",
  "matches",
- "num_cpus",
  "operation_pool",
+ "parking_lot 0.12.1",
  "rand 0.8.5",
  "rlp",
  "slog",
@@ -5435,7 +5203,7 @@ dependencies = [
  "slog-term",
  "sloggers",
  "slot_clock",
- "smallvec",
+ "smallvec 1.11.0",
  "ssz_types",
  "store",
  "strum",
@@ -5452,7 +5220,7 @@ version = "0.23.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8f3790c00a0150112de0f4cd161e3d7fc4b2d8a5542ffc35f099a2562aecb35c"
 dependencies = [
- "bitflags",
+ "bitflags 1.3.2",
  "cc",
  "cfg-if",
  "libc",
@@ -5465,10 +5233,9 @@ version = "0.24.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "fa52e972a9a719cecb6864fb88568781eb706bac2cd1d4f04a648542dbf78069"
 dependencies = [
- "bitflags",
+ "bitflags 1.3.2",
  "cfg-if",
  "libc",
- "memoffset 0.6.5",
 ]
 
 [[package]]
@@ -5477,7 +5244,7 @@ version = "0.26.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "bfdda3d196821d6af13126e40375cdf7da646a96114af134d5f417a9a1dc8e1a"
 dependencies = [
- "bitflags",
+ "bitflags 1.3.2",
  "cfg-if",
  "libc",
  "static_assertions",
@@ -5493,23 +5260,24 @@ dependencies = [
  "execution_layer",
  "sensitive_url",
  "tempfile",
+ "tokio",
  "types",
  "validator_client",
  "validator_dir",
 ]
 
+[[package]]
+name = "nodrop"
+version = "0.1.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "72ef4a56884ca558e5ddb05a1d1e7e1bfd9a68d9ed024c21704cc98872dae1bb"
+
 [[package]]
 name = "nohash-hasher"
 version = "0.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2bf50223579dc7cdcfb3bfcacf7069ff68243f8c363f62ffa99cf000a6b9c451"
 
-[[package]]
-name = "nom"
-version = "2.2.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cf51a729ecf40266a2368ad335a5fdde43471f545a967109cd62146ecf8b66ff"
-
 [[package]]
 name = "nom"
 version = "7.1.3"
@@ -5559,13 +5327,13 @@ dependencies = [
  "autocfg 0.1.8",
  "byteorder",
  "lazy_static",
- "libm 0.2.7",
+ "libm",
  "num-integer",
  "num-iter",
  "num-traits",
  "rand 0.7.3",
  "serde",
- "smallvec",
+ "smallvec 1.11.0",
  "zeroize",
 ]
 
@@ -5592,20 +5360,20 @@ dependencies = [
 
 [[package]]
 name = "num-traits"
-version = "0.2.15"
+version = "0.2.16"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "578ede34cf02f8924ab9447f50c28075b4d3e5b269972345e7e0372b38c6cdcd"
+checksum = "f30b0abd723be7e2ffca1272140fac1a2f084c77ec3e123c192b66af1ee9e6c2"
 dependencies = [
  "autocfg 1.1.0",
 ]
 
 [[package]]
 name = "num_cpus"
-version = "1.15.0"
+version = "1.16.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0fac9e2da13b5eb447a6ce3d392f23a29d8694bff781bf03a16cd9ac8697593b"
+checksum = "4161fcb6d602d4d2081af7c3a45852d875a03dd337a6bfdd6e06407b61342a43"
 dependencies = [
- "hermit-abi 0.2.6",
+ "hermit-abi 0.3.2",
  "libc",
 ]
 
@@ -5620,36 +5388,27 @@ dependencies = [
 
 [[package]]
 name = "object"
-version = "0.30.3"
+version = "0.31.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ea86265d3d3dcb6a27fc51bd29a4bf387fae9d2986b823079d4986af253eb439"
+checksum = "8bda667d9f2b5051b8833f59f3bf748b28ef54f850f4fcb389a252aa383866d1"
 dependencies = [
  "memchr",
 ]
 
-[[package]]
-name = "oid-registry"
-version = "0.4.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "38e20717fa0541f39bd146692035c37bedfa532b3e5071b35761082407546b2a"
-dependencies = [
- "asn1-rs 0.3.1",
-]
-
 [[package]]
 name = "oid-registry"
 version = "0.6.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9bedf36ffb6ba96c2eb7144ef6270557b52e54b20c0a8e1eb2ff99a6c6959bff"
 dependencies = [
- "asn1-rs 0.5.2",
+ "asn1-rs",
 ]
 
 [[package]]
 name = "once_cell"
-version = "1.17.1"
+version = "1.18.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b7e5500299e16ebb147ae15a00a942af264cf3688f47923b8fc2cd5858f23ad3"
+checksum = "dd8b5dd2ae5ed71462c540258bedcb51965123ad7e7ccf4b9a8cafaa4a63576d"
 
 [[package]]
 name = "oneshot_broadcast"
@@ -5697,11 +5456,11 @@ dependencies = [
 
 [[package]]
 name = "openssl"
-version = "0.10.55"
+version = "0.10.56"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "345df152bc43501c5eb9e4654ff05f794effb78d4efe3d53abc158baddc0703d"
+checksum = "729b745ad4a5575dd06a3e1af1414bd330ee561c01b3899eb584baeaa8def17e"
 dependencies = [
- "bitflags",
+ "bitflags 1.3.2",
  "cfg-if",
  "foreign-types",
  "libc",
@@ -5718,7 +5477,7 @@ checksum = "a948666b637a0f465e8564c73e89d4dde00d72d4d473cc972f390fc3dcee7d9c"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.16",
+ "syn 2.0.29",
 ]
 
 [[package]]
@@ -5729,18 +5488,18 @@ checksum = "ff011a302c396a5197692431fc1948019154afc178baf7d8e37367442a4601cf"
 
 [[package]]
 name = "openssl-src"
-version = "111.25.3+1.1.1t"
+version = "111.27.0+1.1.1v"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "924757a6a226bf60da5f7dd0311a34d2b52283dd82ddeb103208ddc66362f80c"
+checksum = "06e8f197c82d7511c5b014030c9b1efeda40d7d5f99d23b4ceed3524a5e63f02"
 dependencies = [
  "cc",
 ]
 
 [[package]]
 name = "openssl-sys"
-version = "0.9.90"
+version = "0.9.91"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "374533b0e45f3a7ced10fcaeccca020e66656bc03dac384f852e4e5a7a8104a6"
+checksum = "866b5f16f90776b9bb8dc1e1802ac6f0513de3a7a7465867bfbc563dc737faac"
 dependencies = [
  "cc",
  "libc",
@@ -5781,34 +5540,14 @@ checksum = "b15813163c1d831bf4a13c3610c05c0d03b39feb07f7e09fa234dac9b15aaf39"
 
 [[package]]
 name = "p256"
-version = "0.11.1"
+version = "0.13.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "51f44edd08f51e2ade572f141051021c5af22677e42b7dd28a88155151c33594"
+checksum = "c9863ad85fa8f4460f9c48cb909d38a0d689dba1f6f6988a5e3e0d31071bcd4b"
 dependencies = [
- "ecdsa 0.14.8",
- "elliptic-curve 0.12.3",
- "sha2 0.10.6",
-]
-
-[[package]]
-name = "p384"
-version = "0.11.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "dfc8c5bf642dde52bb9e87c0ecd8ca5a76faac2eeed98dedb7c717997e1080aa"
-dependencies = [
- "ecdsa 0.14.8",
- "elliptic-curve 0.12.3",
- "sha2 0.10.6",
-]
-
-[[package]]
-name = "packed_simd_2"
-version = "0.3.8"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a1914cd452d8fccd6f9db48147b29fd4ae05bea9dc5d9ad578509f72415de282"
-dependencies = [
- "cfg-if",
- "libm 0.1.4",
+ "ecdsa 0.16.8",
+ "elliptic-curve 0.13.5",
+ "primeorder",
+ "sha2 0.10.7",
 ]
 
 [[package]]
@@ -5827,15 +5566,15 @@ dependencies = [
 
 [[package]]
 name = "parity-scale-codec"
-version = "3.5.0"
+version = "3.6.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5ddb756ca205bd108aee3c62c6d3c994e1df84a59b9d6d4a5ea42ee1fd5a9a28"
+checksum = "dd8e946cc0cc711189c0b0249fb8b599cbeeab9784d83c415719368bb8d4ac64"
 dependencies = [
  "arrayvec",
  "bitvec 1.0.1",
  "byte-slice-cast",
  "impl-trait-for-tuples",
- "parity-scale-codec-derive 3.1.4",
+ "parity-scale-codec-derive 3.6.4",
  "serde",
 ]
 
@@ -5853,9 +5592,9 @@ dependencies = [
 
 [[package]]
 name = "parity-scale-codec-derive"
-version = "3.1.4"
+version = "3.6.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "86b26a931f824dd4eca30b3e43bb4f31cd5f0d3a403c5f5ff27106b805bfde7b"
+checksum = "2a296c3079b5fefbc499e1de58dc26c09b1b9a5952d26694ee89f04a43ebbb3e"
 dependencies = [
  "proc-macro-crate",
  "proc-macro2",
@@ -5887,7 +5626,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3742b2c103b9f06bc9fff0a37ff4912935851bee6d36f3c02bcc755bcfec228f"
 dependencies = [
  "lock_api",
- "parking_lot_core 0.9.7",
+ "parking_lot_core 0.9.8",
 ]
 
 [[package]]
@@ -5900,28 +5639,39 @@ dependencies = [
  "instant",
  "libc",
  "redox_syscall 0.2.16",
- "smallvec",
+ "smallvec 1.11.0",
  "winapi",
 ]
 
 [[package]]
 name = "parking_lot_core"
-version = "0.9.7"
+version = "0.9.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9069cbb9f99e3a5083476ccb29ceb1de18b9118cafa53e90c9551235de2b9521"
+checksum = "93f00c865fe7cabf650081affecd3871070f26767e7b2070a3ffae14c654b447"
 dependencies = [
  "cfg-if",
  "libc",
- "redox_syscall 0.2.16",
- "smallvec",
- "windows-sys 0.45.0",
+ "redox_syscall 0.3.5",
+ "smallvec 1.11.0",
+ "windows-targets 0.48.3",
+]
+
+[[package]]
+name = "password-hash"
+version = "0.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7676374caaee8a325c9e7a2ae557f216c5563a171d6997b0ef8a65af35147700"
+dependencies = [
+ "base64ct",
+ "rand_core 0.6.4",
+ "subtle",
 ]
 
 [[package]]
 name = "paste"
-version = "1.0.12"
+version = "1.0.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9f746c4065a8fa3fe23974dd82f15431cc8d40779821001404d10d2e79ca7d79"
+checksum = "de3145af08024dea9fa9914f381a17b8fc6034dfb00f3a84013f7ff43f29ed4c"
 
 [[package]]
 name = "pbkdf2"
@@ -5941,6 +5691,18 @@ dependencies = [
  "crypto-mac 0.11.1",
 ]
 
+[[package]]
+name = "pbkdf2"
+version = "0.11.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "83a0692ec44e4cf1ef28ca317f14f8f07da2d95ec3fa01f86e4467b725e60917"
+dependencies = [
+ "digest 0.10.7",
+ "hmac 0.12.1",
+ "password-hash",
+ "sha2 0.10.7",
+]
+
 [[package]]
 name = "peeking_take_while"
 version = "0.1.2"
@@ -5958,28 +5720,18 @@ dependencies = [
 
 [[package]]
 name = "pem-rfc7468"
-version = "0.6.0"
+version = "0.7.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "24d159833a9105500e0398934e205e0773f0b27529557134ecfc51c27646adac"
+checksum = "88b39c9bfcfc231068454382784bb460aae594343fb030d46e9f50a645418412"
 dependencies = [
  "base64ct",
 ]
 
 [[package]]
 name = "percent-encoding"
-version = "2.2.0"
+version = "2.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "478c572c3d73181ff3c2539045f6eb99e5491218eae919370993b890cdbdd98e"
-
-[[package]]
-name = "petgraph"
-version = "0.6.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4dd7d28ee937e54fe3080c91faa1c3a46c06de6252988a7f4592ba2310ef22a4"
-dependencies = [
- "fixedbitset",
- "indexmap",
-]
+checksum = "9b2a4787296e9989611394c33f193f676704af1686e70b8f8033ab5ba9a35a94"
 
 [[package]]
 name = "pharos"
@@ -5988,45 +5740,45 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e9567389417feee6ce15dd6527a8a1ecac205ef62c2932bcf3d9f6fc5b78b414"
 dependencies = [
  "futures",
- "rustc_version 0.4.0",
+ "rustc_version",
 ]
 
 [[package]]
 name = "phf"
-version = "0.11.1"
+version = "0.11.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "928c6535de93548188ef63bb7c4036bd415cd8f36ad25af44b9789b2ee72a48c"
+checksum = "ade2d8b8f33c7333b51bcf0428d37e217e9f32192ae4772156f65063b8ce03dc"
 dependencies = [
  "phf_shared",
 ]
 
 [[package]]
 name = "phf_shared"
-version = "0.11.1"
+version = "0.11.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e1fb5f6f826b772a8d4c0394209441e7d37cbbb967ae9c7e0e8134365c9ee676"
+checksum = "90fcb95eef784c2ac79119d1dd819e162b5da872ce6f3c3abe1e8ca1c082f72b"
 dependencies = [
  "siphasher",
 ]
 
 [[package]]
 name = "pin-project"
-version = "1.1.0"
+version = "1.1.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c95a7476719eab1e366eaf73d0260af3021184f18177925b07f54b30089ceead"
+checksum = "fda4ed1c6c173e3fc7a83629421152e01d7b1f9b7f65fb301e490e8cfc656422"
 dependencies = [
  "pin-project-internal",
 ]
 
 [[package]]
 name = "pin-project-internal"
-version = "1.1.0"
+version = "1.1.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "39407670928234ebc5e6e580247dd567ad73a3578460c5990f9503df207e8f07"
+checksum = "4359fd9c9171ec6e8c62926d6faaf553a8dc3f64e1507e76da7911b4f6a04405"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.16",
+ "syn 2.0.29",
 ]
 
 [[package]]
@@ -6037,9 +5789,9 @@ checksum = "257b64915a082f7811703966789728173279bdebb956b143dbcd23f6f970a777"
 
 [[package]]
 name = "pin-project-lite"
-version = "0.2.9"
+version = "0.2.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e0a7ae3ac2f1173085d398531c705756c94a4c56843785df85a60c1a0afac116"
+checksum = "12cc1b0bf1727a77a54b6654e7b5f1af8604923edc8b81885f8ec92f9e3f0a05"
 
 [[package]]
 name = "pin-utils"
@@ -6063,7 +5815,7 @@ version = "0.10.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f950b2377845cebe5cf8b5165cb3cc1a5e0fa5cfa3e1f7f55707d8fd82e0a7b7"
 dependencies = [
- "der 0.7.6",
+ "der 0.7.8",
  "spki 0.7.2",
 ]
 
@@ -6087,9 +5839,9 @@ checksum = "e3d7ddaed09e0eb771a79ab0fd64609ba0afb0a8366421957936ad14cbd13630"
 
 [[package]]
 name = "plotters"
-version = "0.3.4"
+version = "0.3.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2538b639e642295546c50fcd545198c9d64ee2a38620a628724a3b266d5fbf97"
+checksum = "d2c224ba00d7cadd4d5c660deaf2098e5e80e07846537c51f9cfa4be50c1fd45"
 dependencies = [
  "num-traits",
  "plotters-backend",
@@ -6100,15 +5852,15 @@ dependencies = [
 
 [[package]]
 name = "plotters-backend"
-version = "0.3.4"
+version = "0.3.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "193228616381fecdc1224c62e96946dfbc73ff4384fba576e052ff8c1bea8142"
+checksum = "9e76628b4d3a7581389a35d5b6e2139607ad7c75b17aed325f210aa91f4a9609"
 
 [[package]]
 name = "plotters-svg"
-version = "0.3.3"
+version = "0.3.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f9a81d2759aae1dae668f783c308bc5c8ebd191ff4184aaa1b37f65a6ae5a56f"
+checksum = "38f6d39893cca0701371e3c27294f09797214b86f1fb951b89ade8ec04e2abab"
 dependencies = [
  "plotters-backend",
 ]
@@ -6120,12 +5872,12 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "4b2d323e8ca7996b3e23126511a523f7e62924d93ecd5ae73b333815b0eb3dce"
 dependencies = [
  "autocfg 1.1.0",
- "bitflags",
+ "bitflags 1.3.2",
  "cfg-if",
  "concurrent-queue",
  "libc",
  "log",
- "pin-project-lite 0.2.9",
+ "pin-project-lite 0.2.12",
  "windows-sys 0.48.0",
 ]
 
@@ -6137,7 +5889,7 @@ checksum = "048aeb476be11a4b6ca432ca569e375810de9294ae78f4774e78ea98a9246ede"
 dependencies = [
  "cpufeatures",
  "opaque-debug",
- "universal-hash 0.4.1",
+ "universal-hash",
 ]
 
 [[package]]
@@ -6149,19 +5901,7 @@ dependencies = [
  "cfg-if",
  "cpufeatures",
  "opaque-debug",
- "universal-hash 0.4.1",
-]
-
-[[package]]
-name = "polyval"
-version = "0.6.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7ef234e08c11dfcb2e56f79fd70f6f2eb7f025c0ce2333e82f4f0518ecad30c6"
-dependencies = [
- "cfg-if",
- "cpufeatures",
- "opaque-debug",
- "universal-hash 0.5.1",
+ "universal-hash",
 ]
 
 [[package]]
@@ -6170,7 +5910,7 @@ version = "0.6.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "78b7fa9f396f51dffd61546fd8573ee20592287996568e6175ceb0f8699ad75d"
 dependencies = [
- "base64 0.21.1",
+ "base64 0.21.2",
  "byteorder",
  "bytes",
  "fallible-iterator",
@@ -6178,7 +5918,7 @@ dependencies = [
  "md-5",
  "memchr",
  "rand 0.8.5",
- "sha2 0.10.6",
+ "sha2 0.10.7",
  "stringprep",
 ]
 
@@ -6217,13 +5957,12 @@ dependencies = [
 ]
 
 [[package]]
-name = "prettyplease"
-version = "0.1.25"
+name = "primeorder"
+version = "0.13.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6c8646e95016a7a6c4adea95bafa8a16baab64b583356217f2c85db4a39d9a86"
+checksum = "3c2fcef82c0ec6eefcc179b978446c399b3cdf73c392c35604e399eee6df1ee3"
 dependencies = [
- "proc-macro2",
- "syn 1.0.109",
+ "elliptic-curve 0.13.5",
 ]
 
 [[package]]
@@ -6260,7 +5999,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e17d47ce914bf4de440332250b0edd23ce48c005f59fab39d3335866b114f11a"
 dependencies = [
  "thiserror",
- "toml",
+ "toml 0.5.11",
 ]
 
 [[package]]
@@ -6294,24 +6033,38 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "dc375e1527247fe1a97d8b7156678dfe7c1af2fc075c9a4db3690ecd2a148068"
 
 [[package]]
-name = "proc-macro2"
-version = "1.0.58"
+name = "proc-macro-warning"
+version = "0.4.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fa1fb82fc0c281dd9671101b66b771ebbe1eaf967b96ac8740dcba4b70005ca8"
+checksum = "70550716265d1ec349c41f70dd4f964b4fd88394efe4405f0c1da679c4799a07"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.29",
+]
+
+[[package]]
+name = "proc-macro2"
+version = "1.0.66"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "18fb31db3f9bddb2ea821cde30a9f70117e3f119938b5ee630b7403aa6e2ead9"
 dependencies = [
  "unicode-ident",
 ]
 
 [[package]]
-name = "procinfo"
-version = "0.4.2"
+name = "procfs"
+version = "0.15.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6ab1427f3d2635891f842892dda177883dca0639e05fe66796a62c9d2f23b49c"
+checksum = "943ca7f9f29bab5844ecd8fdb3992c5969b6622bb9609b9502fef9b4310e3f1f"
 dependencies = [
+ "bitflags 1.3.2",
  "byteorder",
- "libc",
- "nom 2.2.1",
- "rustc_version 0.2.3",
+ "chrono",
+ "flate2",
+ "hex",
+ "lazy_static",
+ "rustix 0.36.15",
 ]
 
 [[package]]
@@ -6331,92 +6084,25 @@ dependencies = [
 
 [[package]]
 name = "prometheus-client"
-version = "0.18.1"
+version = "0.21.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "83cd1b99916654a69008fd66b4f9397fbe08e6e51dfe23d4417acf5d3b8cb87c"
+checksum = "3c99afa9a01501019ac3a14d71d9f94050346f55ca471ce90c799a15c58f61e2"
 dependencies = [
  "dtoa",
  "itoa",
  "parking_lot 0.12.1",
- "prometheus-client-derive-text-encode",
+ "prometheus-client-derive-encode",
 ]
 
 [[package]]
-name = "prometheus-client-derive-text-encode"
-version = "0.3.0"
+name = "prometheus-client-derive-encode"
+version = "0.4.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "66a455fbcb954c1a7decf3c586e860fd7889cddf4b8e164be736dbac95a953cd"
+checksum = "440f724eba9f6996b75d63681b0a92b06947f1457076d503a4d2e2c8f56442b8"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 1.0.109",
-]
-
-[[package]]
-name = "prost"
-version = "0.11.9"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0b82eaa1d779e9a4bc1c3217db8ffbeabaae1dca241bf70183242128d48681cd"
-dependencies = [
- "bytes",
- "prost-derive",
-]
-
-[[package]]
-name = "prost-build"
-version = "0.11.9"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "119533552c9a7ffacc21e099c24a0ac8bb19c2a2a3f363de84cd9b844feab270"
-dependencies = [
- "bytes",
- "heck",
- "itertools",
- "lazy_static",
- "log",
- "multimap",
- "petgraph",
- "prettyplease",
- "prost",
- "prost-types",
- "regex",
- "syn 1.0.109",
- "tempfile",
- "which",
-]
-
-[[package]]
-name = "prost-codec"
-version = "0.3.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0dc34979ff898b6e141106178981ce2596c387ea6e62533facfc61a37fc879c0"
-dependencies = [
- "asynchronous-codec",
- "bytes",
- "prost",
- "thiserror",
- "unsigned-varint 0.7.1",
-]
-
-[[package]]
-name = "prost-derive"
-version = "0.11.9"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e5d2d8d10f3c6ded6da8b05b5fb3b8a5082514344d56c9f871412d29b4e075b4"
-dependencies = [
- "anyhow",
- "itertools",
- "proc-macro2",
- "quote",
- "syn 1.0.109",
-]
-
-[[package]]
-name = "prost-types"
-version = "0.11.9"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "213622a1460818959ac1181aaeb2dc9c7f63df720db7d788b3e24eacd1983e13"
-dependencies = [
- "prost",
+ "syn 2.0.29",
 ]
 
 [[package]]
@@ -6473,6 +6159,19 @@ dependencies = [
  "byteorder",
 ]
 
+[[package]]
+name = "quick-protobuf-codec"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f8ededb1cd78531627244d51dd0c7139fbe736c7d57af0092a76f0ffb2f56e98"
+dependencies = [
+ "asynchronous-codec",
+ "bytes",
+ "quick-protobuf",
+ "thiserror",
+ "unsigned-varint 0.7.1",
+]
+
 [[package]]
 name = "quickcheck"
 version = "0.9.2"
@@ -6508,28 +6207,58 @@ dependencies = [
 ]
 
 [[package]]
-name = "quinn-proto"
-version = "0.9.3"
+name = "quinn"
+version = "0.10.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "67c10f662eee9c94ddd7135043e544f3c82fa839a1e7b865911331961b53186c"
+checksum = "8cc2c5017e4b43d5995dcea317bc46c1e09404c0a9664d2908f7f02dfe943d75"
+dependencies = [
+ "bytes",
+ "futures-io",
+ "pin-project-lite 0.2.12",
+ "quinn-proto",
+ "quinn-udp",
+ "rustc-hash",
+ "rustls 0.21.6",
+ "thiserror",
+ "tokio",
+ "tracing",
+]
+
+[[package]]
+name = "quinn-proto"
+version = "0.10.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e13f81c9a9d574310b8351f8666f5a93ac3b0069c45c28ad52c10291389a7cf9"
 dependencies = [
  "bytes",
  "rand 0.8.5",
  "ring",
  "rustc-hash",
- "rustls 0.20.8",
+ "rustls 0.21.6",
  "slab",
  "thiserror",
  "tinyvec",
  "tracing",
- "webpki 0.22.0",
+]
+
+[[package]]
+name = "quinn-udp"
+version = "0.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "055b4e778e8feb9f93c4e439f71dc2156ef13360b432b799e179a8c4cdf0b1d7"
+dependencies = [
+ "bytes",
+ "libc",
+ "socket2 0.5.3",
+ "tracing",
+ "windows-sys 0.48.0",
 ]
 
 [[package]]
 name = "quote"
-version = "1.0.27"
+version = "1.0.33"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8f4f29d145265ec1c483c7c654450edde0bfe043d3938d6972630663356d9500"
+checksum = "5267fca4496028628a95160fc423a33e8b2e6af8a5302579e322e4b520293cae"
 dependencies = [
  "proc-macro2",
 ]
@@ -6626,7 +6355,7 @@ version = "0.6.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ec0be4795e2f6a28069bec0b5ff3e2ac9bafc99e6a9a7dc3547996c5c816922c"
 dependencies = [
- "getrandom 0.2.9",
+ "getrandom 0.2.10",
 ]
 
 [[package]]
@@ -6669,19 +6398,6 @@ dependencies = [
  "num_cpus",
 ]
 
-[[package]]
-name = "rcgen"
-version = "0.9.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6413f3de1edee53342e6138e75b56d32e7bc6e332b3bd62d497b1929d4cfbcdd"
-dependencies = [
- "pem",
- "ring",
- "time 0.3.21",
- "x509-parser 0.13.2",
- "yasna",
-]
-
 [[package]]
 name = "rcgen"
 version = "0.10.0"
@@ -6690,7 +6406,7 @@ checksum = "ffbe84efe2f38dea12e9bfc1f65377fdf03e53a18cb3b995faedf7934c7e785b"
 dependencies = [
  "pem",
  "ring",
- "time 0.3.21",
+ "time",
  "yasna",
 ]
 
@@ -6700,7 +6416,7 @@ version = "0.2.16"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "fb5a58c1855b4b6819d59012155603f0b22ad30cad752600aadfcb695265519a"
 dependencies = [
- "bitflags",
+ "bitflags 1.3.2",
 ]
 
 [[package]]
@@ -6709,7 +6425,7 @@ version = "0.3.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "567664f262709473930a4bf9e51bf2ebf3348f2e748ccc50dea20646858f8f29"
 dependencies = [
- "bitflags",
+ "bitflags 1.3.2",
 ]
 
 [[package]]
@@ -6718,20 +6434,21 @@ version = "0.4.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b033d837a7cf162d7993aded9304e30a83213c648b6e389db233191f891e5c2b"
 dependencies = [
- "getrandom 0.2.9",
+ "getrandom 0.2.10",
  "redox_syscall 0.2.16",
  "thiserror",
 ]
 
 [[package]]
 name = "regex"
-version = "1.8.1"
+version = "1.9.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "af83e617f331cc6ae2da5443c602dfa5af81e517212d9d611a5b3ba1777b5370"
+checksum = "81bc1d4caf89fac26a70747fe603c130093b53c773888797a6329091246d651a"
 dependencies = [
  "aho-corasick",
  "memchr",
- "regex-syntax 0.7.1",
+ "regex-automata 0.3.6",
+ "regex-syntax 0.7.4",
 ]
 
 [[package]]
@@ -6743,6 +6460,17 @@ dependencies = [
  "regex-syntax 0.6.29",
 ]
 
+[[package]]
+name = "regex-automata"
+version = "0.3.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fed1ceff11a1dddaee50c9dc8e4938bd106e9d89ae372f192311e7da498e3b69"
+dependencies = [
+ "aho-corasick",
+ "memchr",
+ "regex-syntax 0.7.4",
+]
+
 [[package]]
 name = "regex-syntax"
 version = "0.6.29"
@@ -6751,9 +6479,9 @@ checksum = "f162c6dd7b008981e4d40210aca20b4bd0f9b60ca9271061b07f78537722f2e1"
 
 [[package]]
 name = "regex-syntax"
-version = "0.7.1"
+version = "0.7.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a5996294f19bd3aae0453a862ad728f60e6600695733dd5df01da90c54363a3c"
+checksum = "e5ea92a5b6195c6ef2a0295ea818b312502c6fc94dde986c5553242e18fd4ce2"
 
 [[package]]
 name = "reqwest"
@@ -6761,7 +6489,7 @@ version = "0.11.18"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "cde824a14b7c14f85caff81225f411faacc04a2013f41670f41443742b1c1c55"
 dependencies = [
- "base64 0.21.1",
+ "base64 0.21.2",
  "bytes",
  "encoding_rs",
  "futures-core",
@@ -6779,15 +6507,15 @@ dependencies = [
  "native-tls",
  "once_cell",
  "percent-encoding",
- "pin-project-lite 0.2.9",
- "rustls 0.21.1",
+ "pin-project-lite 0.2.12",
+ "rustls 0.21.6",
  "rustls-pemfile",
  "serde",
  "serde_json",
  "serde_urlencoded",
  "tokio",
  "tokio-native-tls",
- "tokio-rustls 0.24.0",
+ "tokio-rustls 0.24.1",
  "tokio-util 0.7.8",
  "tower-service",
  "url",
@@ -6795,8 +6523,8 @@ dependencies = [
  "wasm-bindgen-futures",
  "wasm-streams",
  "web-sys",
- "webpki-roots",
- "winreg",
+ "webpki-roots 0.22.6",
+ "winreg 0.10.1",
 ]
 
 [[package]]
@@ -6839,7 +6567,7 @@ dependencies = [
  "cc",
  "libc",
  "once_cell",
- "spin",
+ "spin 0.5.2",
  "untrusted",
  "web-sys",
  "winapi",
@@ -6882,17 +6610,6 @@ dependencies = [
  "winapi",
 ]
 
-[[package]]
-name = "rtcp"
-version = "0.7.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1919efd6d4a6a85d13388f9487549bb8e359f17198cc03ffd72f79b553873691"
-dependencies = [
- "bytes",
- "thiserror",
- "webrtc-util",
-]
-
 [[package]]
 name = "rtnetlink"
 version = "0.10.1"
@@ -6908,32 +6625,18 @@ dependencies = [
  "tokio",
 ]
 
-[[package]]
-name = "rtp"
-version = "0.6.8"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a2a095411ff00eed7b12e4c6a118ba984d113e1079582570d56a5ee723f11f80"
-dependencies = [
- "async-trait",
- "bytes",
- "rand 0.8.5",
- "serde",
- "thiserror",
- "webrtc-util",
-]
-
 [[package]]
 name = "rusqlite"
 version = "0.28.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "01e213bc3ecb39ac32e81e51ebe31fd888a940515173e3a18a35f8c6e896422a"
 dependencies = [
- "bitflags",
+ "bitflags 1.3.2",
  "fallible-iterator",
  "fallible-streaming-iterator",
- "hashlink 0.8.2",
+ "hashlink 0.8.3",
  "libsqlite3-sys",
- "smallvec",
+ "smallvec 1.11.0",
 ]
 
 [[package]]
@@ -6954,22 +6657,13 @@ version = "2.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3e75f6a532d0fd9f7f13144f392b6ad56a32696bfcd9c78f797f16bbb6f072d6"
 
-[[package]]
-name = "rustc_version"
-version = "0.2.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "138e3e0acb6c9fb258b19b67cb8abd63c00679d2851805ea151465464fe9030a"
-dependencies = [
- "semver 0.9.0",
-]
-
 [[package]]
 name = "rustc_version"
 version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "bfa0f585226d2e68097d4f95d113b15b83a82e819ab25717ec0590d9584ef366"
 dependencies = [
- "semver 1.0.17",
+ "semver",
 ]
 
 [[package]]
@@ -6978,34 +6672,48 @@ version = "4.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "faf0c4a6ece9950b9abdb62b1cfcf2a68b3b67a10ba445b3bb85be2a293d0632"
 dependencies = [
- "nom 7.1.3",
+ "nom",
 ]
 
 [[package]]
 name = "rustix"
-version = "0.37.19"
+version = "0.36.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "acf8729d8542766f1b2cf77eb034d52f40d375bb8b615d0b147089946e16613d"
+checksum = "c37f1bd5ef1b5422177b7646cba67430579cfe2ace80f284fee876bca52ad941"
 dependencies = [
- "bitflags",
+ "bitflags 1.3.2",
  "errno",
  "io-lifetimes",
  "libc",
- "linux-raw-sys",
+ "linux-raw-sys 0.1.4",
+ "windows-sys 0.45.0",
+]
+
+[[package]]
+name = "rustix"
+version = "0.37.23"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4d69718bf81c6127a49dc64e44a742e8bb9213c0ff8869a22c308f84c1d4ab06"
+dependencies = [
+ "bitflags 1.3.2",
+ "errno",
+ "io-lifetimes",
+ "libc",
+ "linux-raw-sys 0.3.8",
  "windows-sys 0.48.0",
 ]
 
 [[package]]
-name = "rustls"
-version = "0.19.1"
+name = "rustix"
+version = "0.38.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "35edb675feee39aec9c99fa5ff985081995a06d594114ae14cbe797ad7b7a6d7"
+checksum = "19ed4fa021d81c8392ce04db050a3da9a60299050b7ae1cf482d862b54a7218f"
 dependencies = [
- "base64 0.13.1",
- "log",
- "ring",
- "sct 0.6.1",
- "webpki 0.21.4",
+ "bitflags 2.4.0",
+ "errno",
+ "libc",
+ "linux-raw-sys 0.4.5",
+ "windows-sys 0.48.0",
 ]
 
 [[package]]
@@ -7016,36 +6724,36 @@ checksum = "fff78fc74d175294f4e83b28343315ffcfb114b156f0185e9741cb5570f50e2f"
 dependencies = [
  "log",
  "ring",
- "sct 0.7.0",
- "webpki 0.22.0",
+ "sct",
+ "webpki",
 ]
 
 [[package]]
 name = "rustls"
-version = "0.21.1"
+version = "0.21.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c911ba11bc8433e811ce56fde130ccf32f5127cab0e0194e9c68c5a5b671791e"
+checksum = "1d1feddffcfcc0b33f5c6ce9a29e341e4cd59c3f78e7ee45f4a40c038b1d6cbb"
 dependencies = [
  "log",
  "ring",
  "rustls-webpki",
- "sct 0.7.0",
+ "sct",
 ]
 
 [[package]]
 name = "rustls-pemfile"
-version = "1.0.2"
+version = "1.0.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d194b56d58803a43635bdc398cd17e383d6f71f9182b9a192c127ca42494a59b"
+checksum = "2d3987094b1d07b653b7dfdc3f70ce9a1da9c51ac18c1b06b662e4f9a0e9f4b2"
 dependencies = [
- "base64 0.21.1",
+ "base64 0.21.2",
 ]
 
 [[package]]
 name = "rustls-webpki"
-version = "0.100.1"
+version = "0.101.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d6207cd5ed3d8dca7816f8f3725513a34609c0c765bf652b8c3cb4cfd87db46b"
+checksum = "7d93931baf2d282fff8d3a532bbfd7653f734643161b87e3e01e59a04439bf0d"
 dependencies = [
  "ring",
  "untrusted",
@@ -7053,15 +6761,15 @@ dependencies = [
 
 [[package]]
 name = "rustversion"
-version = "1.0.12"
+version = "1.0.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4f3208ce4d8448b3f3e7d168a73f5e0c43a61e32930de3bceeccedb388b6bf06"
+checksum = "7ffc183a10b4478d04cbbbfc96d0873219d962dd5accaff2ffbd4ceb7df837f4"
 
 [[package]]
 name = "rw-stream-sink"
-version = "0.3.0"
+version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "26338f5e09bb721b85b135ea05af7767c90b52f6de4f087d4f4a3a9d64e7dc04"
+checksum = "d8c9026ff5d2f23da5e45bbc283f156383001bfb09c4e44256d02c1a685fe9a1"
 dependencies = [
  "futures",
  "pin-project",
@@ -7070,20 +6778,14 @@ dependencies = [
 
 [[package]]
 name = "ryu"
-version = "1.0.13"
+version = "1.0.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f91339c0467de62360649f8d3e185ca8de4224ff281f66000de5eb2a77a79041"
+checksum = "1ad4cc8da4ef723ed60bced201181d83791ad433213d8c24efffda1eec85d741"
 
 [[package]]
 name = "safe_arith"
 version = "0.1.0"
 
-[[package]]
-name = "safemem"
-version = "0.3.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ef703b7cb59335eae2eb93ceb664c0eb7ea6bf567079d843e09420219668e072"
-
 [[package]]
 name = "salsa20"
 version = "0.8.1"
@@ -7104,21 +6806,21 @@ dependencies = [
 
 [[package]]
 name = "scale-info"
-version = "2.7.0"
+version = "2.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b569c32c806ec3abdf3b5869fb8bf1e0d275a7c1c9b0b05603d9464632649edf"
+checksum = "35c0a159d0c45c12b20c5a844feb1fe4bea86e28f17b92a5f0c42193634d3782"
 dependencies = [
  "cfg-if",
  "derive_more",
- "parity-scale-codec 3.5.0",
+ "parity-scale-codec 3.6.4",
  "scale-info-derive",
 ]
 
 [[package]]
 name = "scale-info-derive"
-version = "2.6.0"
+version = "2.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "53012eae69e5aa5c14671942a5dd47de59d4cdcff8532a6dd0e081faf1119482"
+checksum = "912e55f6d20e0e80d63733872b40e1227c0bce1e1ab81ba67d696339bfd7fd29"
 dependencies = [
  "proc-macro-crate",
  "proc-macro2",
@@ -7128,11 +6830,11 @@ dependencies = [
 
 [[package]]
 name = "schannel"
-version = "0.1.21"
+version = "0.1.22"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "713cfb06c7059f3588fb8044c0fad1d09e3c01d225e25b9220dbfdcf16dbb1b3"
+checksum = "0c3733bf4cf7ea0880754e19cb5a462007c4a8c1914bff372ccc95b464f1df88"
 dependencies = [
- "windows-sys 0.42.0",
+ "windows-sys 0.48.0",
 ]
 
 [[package]]
@@ -7152,9 +6854,9 @@ checksum = "e1cf6437eb19a8f4a6cc0f7dca544973b0b78843adbfeb3683d1a94a0024a294"
 
 [[package]]
 name = "scopeguard"
-version = "1.1.0"
+version = "1.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d29ab0c6d3fc0ee92fe66e2d99f700eab17a8d57d1c1d3b748380fb20baa78cd"
+checksum = "94143f37725109f92c262ed2cf5e59bce7498c01bcc1502d7b9afe439a4e9f49"
 
 [[package]]
 name = "scrypt"
@@ -7168,16 +6870,6 @@ dependencies = [
  "sha2 0.9.9",
 ]
 
-[[package]]
-name = "sct"
-version = "0.6.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b362b83898e0e69f38515b82ee15aa80636befe47c3b6d3d89a911e78fc228ce"
-dependencies = [
- "ring",
- "untrusted",
-]
-
 [[package]]
 name = "sct"
 version = "0.7.0"
@@ -7188,18 +6880,6 @@ dependencies = [
  "untrusted",
 ]
 
-[[package]]
-name = "sdp"
-version = "0.5.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4d22a5ef407871893fd72b4562ee15e4742269b173959db4b8df6f538c414e13"
-dependencies = [
- "rand 0.8.5",
- "substring",
- "thiserror",
- "url",
-]
-
 [[package]]
 name = "sec1"
 version = "0.3.0"
@@ -7216,12 +6896,12 @@ dependencies = [
 
 [[package]]
 name = "sec1"
-version = "0.7.2"
+version = "0.7.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f0aec48e813d6b90b15f0b8948af3c63483992dee44c03e9930b3eebdabe046e"
+checksum = "d3e97a565f76233a6003f9f5c54be1d9c5bdfa3eccfb189469f11ec4901c47dc"
 dependencies = [
  "base16ct 0.2.0",
- "der 0.7.6",
+ "der 0.7.8",
  "generic-array",
  "pkcs8 0.10.2",
  "subtle",
@@ -7230,11 +6910,11 @@ dependencies = [
 
 [[package]]
 name = "security-framework"
-version = "2.9.1"
+version = "2.9.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1fc758eb7bffce5b308734e9b0c1468893cae9ff70ebf13e7090be8dcbcc83a8"
+checksum = "05b64fb303737d99b81884b2c63433e9ae28abebe5eb5045dcdd175dc2ecf4de"
 dependencies = [
- "bitflags",
+ "bitflags 1.3.2",
  "core-foundation",
  "core-foundation-sys",
  "libc",
@@ -7243,9 +6923,9 @@ dependencies = [
 
 [[package]]
 name = "security-framework-sys"
-version = "2.9.0"
+version = "2.9.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f51d0c0d83bec45f16480d0ce0058397a69e48fcdc52d1dc8855fb68acbd31a7"
+checksum = "e932934257d3b408ed8f30db49d85ea163bfe74961f017f405b025af298f0c7a"
 dependencies = [
  "core-foundation-sys",
  "libc",
@@ -7253,28 +6933,13 @@ dependencies = [
 
 [[package]]
 name = "semver"
-version = "0.9.0"
+version = "1.0.18"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1d7eb9ef2c18661902cc47e535f9bc51b78acd254da71d375c2f6720d9a40403"
-dependencies = [
- "semver-parser",
-]
-
-[[package]]
-name = "semver"
-version = "1.0.17"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bebd363326d05ec3e2f532ab7660680f3b02130d780c299bca73469d521bc0ed"
+checksum = "b0293b4b29daaf487284529cc2f5675b8e57c61f70167ba415a463651fd6a918"
 dependencies = [
  "serde",
 ]
 
-[[package]]
-name = "semver-parser"
-version = "0.7.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "388a1df253eca08550bef6c72392cfe7c30914bf41df5269b68cbd6ff8f570a3"
-
 [[package]]
 name = "send_wrapper"
 version = "0.6.0"
@@ -7291,13 +6956,24 @@ dependencies = [
 
 [[package]]
 name = "serde"
-version = "1.0.163"
+version = "1.0.183"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2113ab51b87a539ae008b5c6c02dc020ffa39afd2d83cffcb3f4eb2722cebec2"
+checksum = "32ac8da02677876d532745a130fc9d8e6edfa81a269b107c5b00829b91d8eb3c"
 dependencies = [
  "serde_derive",
 ]
 
+[[package]]
+name = "serde-hex"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ca37e3e4d1b39afd7ff11ee4e947efae85adfddf4841787bfa47c470e96dc26d"
+dependencies = [
+ "array-init",
+ "serde",
+ "smallvec 0.6.14",
+]
+
 [[package]]
 name = "serde_array_query"
 version = "0.1.0"
@@ -7320,20 +6996,20 @@ dependencies = [
 
 [[package]]
 name = "serde_derive"
-version = "1.0.163"
+version = "1.0.183"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8c805777e3930c8883389c602315a24224bcc738b63905ef87cd1420353ea93e"
+checksum = "aafe972d60b0b9bee71a91b92fee2d4fb3c9d7e8f6b179aa99f27203d99a4816"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.16",
+ "syn 2.0.29",
 ]
 
 [[package]]
 name = "serde_json"
-version = "1.0.96"
+version = "1.0.105"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "057d394a50403bcac12672b2b18fb387ab6d289d957dab67dd201875391e52f1"
+checksum = "693151e1ac27563d6dbcec9dee9fbd5da8539b20fa14ad3752b2e6d363ace360"
 dependencies = [
  "itoa",
  "ryu",
@@ -7341,14 +7017,33 @@ dependencies = [
 ]
 
 [[package]]
-name = "serde_repr"
-version = "0.1.12"
+name = "serde_path_to_error"
+version = "0.1.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bcec881020c684085e55a25f7fd888954d56609ef363479dc5a1305eb0d40cab"
+checksum = "4beec8bce849d58d06238cb50db2e1c417cfeafa4c63f692b15c82b7c80f8335"
+dependencies = [
+ "itoa",
+ "serde",
+]
+
+[[package]]
+name = "serde_repr"
+version = "0.1.16"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8725e1dfadb3a50f7e5ce0b1a540466f6ed3fe7a0fca2ac2b8b831d31316bd00"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.16",
+ "syn 2.0.29",
+]
+
+[[package]]
+name = "serde_spanned"
+version = "0.6.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "96426c9936fd7a0124915f9185ea1d20aa9445cc9821142f0a73bc9207a2e186"
+dependencies = [
+ "serde",
 ]
 
 [[package]]
@@ -7379,7 +7074,7 @@ version = "1.5.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e182d6ec6f05393cc0e5ed1bf81ad6db3a8feedf8ee515ecdd369809bcce8082"
 dependencies = [
- "darling 0.13.4",
+ "darling",
  "proc-macro2",
  "quote",
  "syn 1.0.109",
@@ -7391,7 +7086,7 @@ version = "0.8.26"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "578a7433b776b56a35785ed5ce9a7e777ac0598aac5a6dd1b4b18a307c7fc71b"
 dependencies = [
- "indexmap",
+ "indexmap 1.9.3",
  "ryu",
  "serde",
  "yaml-rust",
@@ -7447,9 +7142,9 @@ dependencies = [
 
 [[package]]
 name = "sha2"
-version = "0.10.6"
+version = "0.10.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "82e6b795fe2e3b1e845bafcb27aa35405c4d47cdfc92af5fc8d3002f76cebdc0"
+checksum = "479fb9d862239e610720565ca91403019f2f00410f1864c5aa7479b950a76ed8"
 dependencies = [
  "cfg-if",
  "cpufeatures",
@@ -7531,7 +7226,7 @@ dependencies = [
  "num-bigint",
  "num-traits",
  "thiserror",
- "time 0.3.21",
+ "time",
 ]
 
 [[package]]
@@ -7663,7 +7358,7 @@ dependencies = [
  "serde",
  "serde_json",
  "slog",
- "time 0.3.21",
+ "time",
 ]
 
 [[package]]
@@ -7708,14 +7403,14 @@ dependencies = [
  "slog",
  "term",
  "thread_local",
- "time 0.3.21",
+ "time",
 ]
 
 [[package]]
 name = "sloggers"
-version = "2.1.1"
+version = "2.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e20d36cb80da75a9c5511872f15247ddad14ead8c1dd97a86b56d1be9f5d4a0e"
+checksum = "7a0a4d8569a69ee56f277bffc2f6eee637b98ed468448e8a5a84fa63efe4de9d"
 dependencies = [
  "chrono",
  "libc",
@@ -7747,9 +7442,18 @@ dependencies = [
 
 [[package]]
 name = "smallvec"
-version = "1.10.0"
+version = "0.6.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a507befe795404456341dfab10cef66ead4c041f62b8b11bbb92bffe5d0953e0"
+checksum = "b97fcaeba89edba30f044a10c6a3cc39df9c3f17d7cd829dd1446cab35f890e0"
+dependencies = [
+ "maybe-uninit",
+]
+
+[[package]]
+name = "smallvec"
+version = "1.11.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "62bb4feee49fdd9f707ef802e22365a35de4b7b299de4763d44bfea899442ff9"
 
 [[package]]
 name = "snap"
@@ -7759,18 +7463,18 @@ checksum = "5e9f0ab6ef7eb7353d9119c170a436d1bf248eea575ac42d19d12f4e34130831"
 
 [[package]]
 name = "snow"
-version = "0.9.0"
+version = "0.9.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "774d05a3edae07ce6d68ea6984f3c05e9bba8927e3dd591e3b479e5b03213d0d"
+checksum = "0c9d1425eb528a21de2755c75af4c9b5d57f50a0d4c3b7f1828a4cd03f8ba155"
 dependencies = [
- "aes-gcm 0.9.4",
+ "aes-gcm",
  "blake2",
  "chacha20poly1305",
- "curve25519-dalek 4.0.0-rc.2",
+ "curve25519-dalek 4.0.0",
  "rand_core 0.6.4",
  "ring",
- "rustc_version 0.4.0",
- "sha2 0.10.6",
+ "rustc_version",
+ "sha2 0.10.7",
  "subtle",
 ]
 
@@ -7802,7 +7506,6 @@ checksum = "41d1c5305e39e09653383c2c7244f2f78b3bcae37cf50c64cb4789c9f5096ec2"
 dependencies = [
  "base64 0.13.1",
  "bytes",
- "flate2",
  "futures",
  "httparse",
  "log",
@@ -7816,6 +7519,12 @@ version = "0.5.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6e63cff320ae2c57904679ba7cb63280a3dc4613885beafb148ee7bf9aa9042d"
 
+[[package]]
+name = "spin"
+version = "0.9.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6980e8d7511241f8acf4aebddbb1ff938df5eebe98691418c4468d0b72a96a67"
+
 [[package]]
 name = "spki"
 version = "0.6.0"
@@ -7833,27 +7542,28 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9d1e996ef02c474957d681f1b05213dfb0abab947b446a62d37770b23500184a"
 dependencies = [
  "base64ct",
- "der 0.7.6",
+ "der 0.7.8",
 ]
 
 [[package]]
-name = "ssz-rs"
-version = "0.8.0"
-source = "git+https://github.com/ralexstokes//ssz-rs?rev=adf1a0b14cef90b9536f28ef89da1fab316465e1#adf1a0b14cef90b9536f28ef89da1fab316465e1"
+name = "ssz_rs"
+version = "0.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "057291e5631f280978fa9c8009390663ca4613359fc1318e36a8c24c392f6d1f"
 dependencies = [
  "bitvec 1.0.1",
  "hex",
  "num-bigint",
  "serde",
  "sha2 0.9.9",
- "ssz-rs-derive",
- "thiserror",
+ "ssz_rs_derive",
 ]
 
 [[package]]
-name = "ssz-rs-derive"
-version = "0.8.0"
-source = "git+https://github.com/ralexstokes//ssz-rs?rev=adf1a0b14cef90b9536f28ef89da1fab316465e1#adf1a0b14cef90b9536f28ef89da1fab316465e1"
+name = "ssz_rs_derive"
+version = "0.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f07d54c4d01a1713eb363b55ba51595da15f6f1211435b71466460da022aa140"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -7862,9 +7572,9 @@ dependencies = [
 
 [[package]]
 name = "ssz_types"
-version = "0.5.3"
+version = "0.5.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e43767964a80b2fdeda7a79a57a2b6cbca966688d5b81da8fe91140a94f552a1"
+checksum = "382939886cb24ee8ac885d09116a60f6262d827c7a9e36012b4f6d3d0116d0b3"
 dependencies = [
  "arbitrary",
  "derivative",
@@ -7873,7 +7583,7 @@ dependencies = [
  "itertools",
  "serde",
  "serde_derive",
- "smallvec",
+ "smallvec 1.11.0",
  "tree_hash",
  "typenum",
 ]
@@ -7898,7 +7608,7 @@ dependencies = [
  "merkle_proof",
  "rayon",
  "safe_arith",
- "smallvec",
+ "smallvec 1.11.0",
  "ssz_types",
  "tokio",
  "tree_hash",
@@ -7950,9 +7660,9 @@ dependencies = [
 
 [[package]]
 name = "stringprep"
-version = "0.1.2"
+version = "0.1.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8ee348cb74b87454fff4b551cbf727025810a004f88aeacae7f85b87f4e9a1c1"
+checksum = "db3737bde7edce97102e0e2b15365bf7a20bfdb5f60f4f9e8d7004258a51a8da"
 dependencies = [
  "unicode-bidi",
  "unicode-normalization",
@@ -7992,34 +7702,6 @@ dependencies = [
  "syn 1.0.109",
 ]
 
-[[package]]
-name = "stun"
-version = "0.4.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a7e94b1ec00bad60e6410e058b52f1c66de3dc5fe4d62d09b3e52bb7d3b73e25"
-dependencies = [
- "base64 0.13.1",
- "crc",
- "lazy_static",
- "md-5",
- "rand 0.8.5",
- "ring",
- "subtle",
- "thiserror",
- "tokio",
- "url",
- "webrtc-util",
-]
-
-[[package]]
-name = "substring"
-version = "1.4.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "42ee6433ecef213b2e72f587ef64a2f5943e7cd16fbd82dbe8bc07486c534c86"
-dependencies = [
- "autocfg 1.1.0",
-]
-
 [[package]]
 name = "subtle"
 version = "2.4.1"
@@ -8032,11 +7714,11 @@ version = "0.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "95a99807a055ff4ff5d249bb84c80d9eabb55ca3c452187daae43fd5b51ef695"
 dependencies = [
- "darling 0.13.4",
+ "darling",
  "itertools",
  "proc-macro2",
  "quote",
- "smallvec",
+ "smallvec 1.11.0",
  "syn 1.0.109",
 ]
 
@@ -8046,11 +7728,11 @@ version = "0.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "75b9e5728aa1a87141cefd4e7509903fc01fa0dcb108022b1e841a67c5159fc5"
 dependencies = [
- "darling 0.13.4",
+ "darling",
  "itertools",
  "proc-macro2",
  "quote",
- "smallvec",
+ "smallvec 1.11.0",
  "syn 1.0.109",
 ]
 
@@ -8076,9 +7758,9 @@ dependencies = [
 
 [[package]]
 name = "syn"
-version = "2.0.16"
+version = "2.0.29"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a6f671d4b5ffdb8eadec19c0ae67fe2639df8684bd7bc4b83d986b8db549cf01"
+checksum = "c324c494eba9d92503e6f1ef2e6df781e78f6a7705a0202d9801b198807d518a"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -8124,7 +7806,7 @@ version = "0.5.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ba3a3adc5c275d719af8cb4272ea1c4a6d668a777f37e115f6d11ddbc1c8e0e7"
 dependencies = [
- "bitflags",
+ "bitflags 1.3.2",
  "core-foundation",
  "system-configuration-sys",
 ]
@@ -8192,15 +7874,15 @@ dependencies = [
 
 [[package]]
 name = "tempfile"
-version = "3.5.0"
+version = "3.7.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b9fbec84f381d5795b08656e4912bec604d162bff9291d6189a78f4c8ab87998"
+checksum = "dc02fddf48964c42031a0b3fe0428320ecf3a73c401040fc0096f97794310651"
 dependencies = [
  "cfg-if",
- "fastrand",
+ "fastrand 2.0.0",
  "redox_syscall 0.3.5",
- "rustix",
- "windows-sys 0.45.0",
+ "rustix 0.38.8",
+ "windows-sys 0.48.0",
 ]
 
 [[package]]
@@ -8242,8 +7924,7 @@ dependencies = [
 [[package]]
 name = "testcontainers"
 version = "0.14.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0e2b1567ca8a2b819ea7b28c92be35d9f76fb9edb214321dcc86eb96023d1f87"
+source = "git+https://github.com/testcontainers/testcontainers-rs/?rev=0f2c9851#0f2c985160e51a200cfc847097c15b8d85ed7df1"
 dependencies = [
  "bollard-stubs",
  "futures",
@@ -8253,7 +7934,7 @@ dependencies = [
  "rand 0.8.5",
  "serde",
  "serde_json",
- "sha2 0.10.6",
+ "sha2 0.10.7",
 ]
 
 [[package]]
@@ -8267,22 +7948,22 @@ dependencies = [
 
 [[package]]
 name = "thiserror"
-version = "1.0.40"
+version = "1.0.47"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "978c9a314bd8dc99be594bc3c175faaa9794be04a5a5e153caba6915336cebac"
+checksum = "97a802ec30afc17eee47b2855fc72e0c4cd62be9b4efe6591edde0ec5bd68d8f"
 dependencies = [
  "thiserror-impl",
 ]
 
 [[package]]
 name = "thiserror-impl"
-version = "1.0.40"
+version = "1.0.47"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f9456a42c5b0d803c8cd86e73dd7cc9edd429499f37a3550d286d5e86720569f"
+checksum = "6bb623b56e39ab7dcd4b1b98bb6c8f8d907ed255b18de254088016b27a8ee19b"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.16",
+ "syn 2.0.29",
 ]
 
 [[package]]
@@ -8306,21 +7987,11 @@ dependencies = [
 
 [[package]]
 name = "time"
-version = "0.1.45"
+version = "0.3.25"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1b797afad3f312d1c66a56d11d0316f916356d11bd158fbc6ca6389ff6bf805a"
-dependencies = [
- "libc",
- "wasi 0.10.0+wasi-snapshot-preview1",
- "winapi",
-]
-
-[[package]]
-name = "time"
-version = "0.3.21"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8f3403384eaacbca9923fa06940178ac13e4edb725486d70e8e15881d0c836cc"
+checksum = "b0fdd63d58b18d663fbdf70e049f00a22c8e42be082203be7f26589213cd75ea"
 dependencies = [
+ "deranged",
  "itoa",
  "libc",
  "num_threads",
@@ -8337,9 +8008,9 @@ checksum = "7300fbefb4dadc1af235a9cef3737cea692a9d97e1b9cbcd4ebdae6f8868e6fb"
 
 [[package]]
 name = "time-macros"
-version = "0.2.9"
+version = "0.2.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "372950940a5f07bf38dbe211d7283c9e6d7327df53794992d293e534c733d09b"
+checksum = "eb71511c991639bb078fd5bf97757e03914361c48100d52878b8e52b46fb92cd"
 dependencies = [
  "time-core",
 ]
@@ -8410,19 +8081,19 @@ checksum = "1f3ccbac311fea05f86f61904b462b55fb3df8837a366dfc601a0161d0532f20"
 
 [[package]]
 name = "tokio"
-version = "1.28.1"
+version = "1.32.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0aa32867d44e6f2ce3385e89dceb990188b8bb0fb25b0cf576647a6f98ac5105"
+checksum = "17ed6077ed6cd6c74735e21f37eb16dc3935f96878b1fe961074089cc80893f9"
 dependencies = [
- "autocfg 1.1.0",
+ "backtrace",
  "bytes",
  "libc",
  "mio",
  "num_cpus",
  "parking_lot 0.12.1",
- "pin-project-lite 0.2.9",
+ "pin-project-lite 0.2.12",
  "signal-hook-registry",
- "socket2 0.4.9",
+ "socket2 0.5.3",
  "tokio-macros",
  "windows-sys 0.48.0",
 ]
@@ -8433,7 +8104,7 @@ version = "1.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "30b74022ada614a1b4834de765f9bb43877f910cc8ce4be40e89042c9223a8bf"
 dependencies = [
- "pin-project-lite 0.2.9",
+ "pin-project-lite 0.2.12",
  "tokio",
 ]
 
@@ -8445,7 +8116,7 @@ checksum = "630bdcf245f78637c13ec01ffae6187cca34625e8c63150d424b59e55af2675e"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.16",
+ "syn 2.0.29",
 ]
 
 [[package]]
@@ -8474,7 +8145,7 @@ dependencies = [
  "parking_lot 0.12.1",
  "percent-encoding",
  "phf",
- "pin-project-lite 0.2.9",
+ "pin-project-lite 0.2.12",
  "postgres-protocol",
  "postgres-types",
  "socket2 0.5.3",
@@ -8482,17 +8153,6 @@ dependencies = [
  "tokio-util 0.7.8",
 ]
 
-[[package]]
-name = "tokio-rustls"
-version = "0.22.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bc6844de72e57df1980054b38be3a9f4702aba4858be64dd700181a8a6d0e1b6"
-dependencies = [
- "rustls 0.19.1",
- "tokio",
- "webpki 0.21.4",
-]
-
 [[package]]
 name = "tokio-rustls"
 version = "0.23.4"
@@ -8501,16 +8161,16 @@ checksum = "c43ee83903113e03984cb9e5cebe6c04a5116269e900e3ddba8f068a62adda59"
 dependencies = [
  "rustls 0.20.8",
  "tokio",
- "webpki 0.22.0",
+ "webpki",
 ]
 
 [[package]]
 name = "tokio-rustls"
-version = "0.24.0"
+version = "0.24.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e0d409377ff5b1e3ca6437aa86c1eb7d40c134bfec254e44c830defa92669db5"
+checksum = "c28327cf380ac148141087fbfb9de9d7bd4e84ab5d2c28fbc911d753de8a7081"
 dependencies = [
- "rustls 0.21.1",
+ "rustls 0.21.6",
  "tokio",
 ]
 
@@ -8521,24 +8181,11 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "397c988d37662c7dda6d2208364a706264bf3d6138b11d436cbac0ad38832842"
 dependencies = [
  "futures-core",
- "pin-project-lite 0.2.9",
+ "pin-project-lite 0.2.12",
  "tokio",
  "tokio-util 0.7.8",
 ]
 
-[[package]]
-name = "tokio-tungstenite"
-version = "0.15.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "511de3f85caf1c98983545490c3d09685fa8eb634e57eec22bb4db271f46cbd8"
-dependencies = [
- "futures-util",
- "log",
- "pin-project",
- "tokio",
- "tungstenite 0.14.0",
-]
-
 [[package]]
 name = "tokio-tungstenite"
 version = "0.17.2"
@@ -8551,8 +8198,20 @@ dependencies = [
  "tokio",
  "tokio-rustls 0.23.4",
  "tungstenite 0.17.3",
- "webpki 0.22.0",
- "webpki-roots",
+ "webpki",
+ "webpki-roots 0.22.6",
+]
+
+[[package]]
+name = "tokio-tungstenite"
+version = "0.18.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "54319c93411147bced34cb5609a80e0a8e44c5999c93903a81cd866630ec0bfd"
+dependencies = [
+ "futures-util",
+ "log",
+ "tokio",
+ "tungstenite 0.18.0",
 ]
 
 [[package]]
@@ -8566,7 +8225,7 @@ dependencies = [
  "futures-io",
  "futures-sink",
  "log",
- "pin-project-lite 0.2.9",
+ "pin-project-lite 0.2.12",
  "slab",
  "tokio",
 ]
@@ -8579,9 +8238,8 @@ checksum = "806fe8c2c87eccc8b3267cbae29ed3ab2d0bd37fca70ab622e46aaa9375ddb7d"
 dependencies = [
  "bytes",
  "futures-core",
- "futures-io",
  "futures-sink",
- "pin-project-lite 0.2.9",
+ "pin-project-lite 0.2.12",
  "slab",
  "tokio",
  "tracing",
@@ -8596,6 +8254,40 @@ dependencies = [
  "serde",
 ]
 
+[[package]]
+name = "toml"
+version = "0.7.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c17e963a819c331dcacd7ab957d80bc2b9a9c1e71c804826d2f283dd65306542"
+dependencies = [
+ "serde",
+ "serde_spanned",
+ "toml_datetime",
+ "toml_edit",
+]
+
+[[package]]
+name = "toml_datetime"
+version = "0.6.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7cda73e2f1397b1262d6dfdcef8aafae14d1de7748d66822d3bfeeb6d03e5e4b"
+dependencies = [
+ "serde",
+]
+
+[[package]]
+name = "toml_edit"
+version = "0.19.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f8123f27e969974a3dfba720fdb560be359f57b44302d280ba72e76a74480e8a"
+dependencies = [
+ "indexmap 2.0.0",
+ "serde",
+ "serde_spanned",
+ "toml_datetime",
+ "winnow",
+]
+
 [[package]]
 name = "tower"
 version = "0.4.13"
@@ -8605,32 +8297,13 @@ dependencies = [
  "futures-core",
  "futures-util",
  "pin-project",
- "pin-project-lite 0.2.9",
+ "pin-project-lite 0.2.12",
  "tokio",
  "tower-layer",
  "tower-service",
  "tracing",
 ]
 
-[[package]]
-name = "tower-http"
-version = "0.3.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f873044bf02dd1e8239e9c1293ea39dad76dc594ec16185d0a1bf31d8dc8d858"
-dependencies = [
- "bitflags",
- "bytes",
- "futures-core",
- "futures-util",
- "http",
- "http-body",
- "http-range-header",
- "pin-project-lite 0.2.9",
- "tower",
- "tower-layer",
- "tower-service",
-]
-
 [[package]]
 name = "tower-layer"
 version = "0.3.2"
@@ -8651,20 +8324,20 @@ checksum = "8ce8c33a8d48bd45d624a6e523445fd21ec13d3653cd51f681abf67418f54eb8"
 dependencies = [
  "cfg-if",
  "log",
- "pin-project-lite 0.2.9",
+ "pin-project-lite 0.2.12",
  "tracing-attributes",
  "tracing-core",
 ]
 
 [[package]]
 name = "tracing-attributes"
-version = "0.1.24"
+version = "0.1.26"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0f57e3ca2a01450b1a921183a9c9cbfda207fd822cef4ccb00a65402cbba7a74"
+checksum = "5f4f31f56159e98206da9efd823404b79b6ef3143b4a7ab76e67b1751b25a4ab"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.16",
+ "syn 2.0.29",
 ]
 
 [[package]]
@@ -8709,7 +8382,7 @@ dependencies = [
  "once_cell",
  "regex",
  "sharded-slab",
- "smallvec",
+ "smallvec 1.11.0",
  "thread_local",
  "tracing",
  "tracing-core",
@@ -8737,22 +8410,22 @@ dependencies = [
 
 [[package]]
 name = "tree_hash"
-version = "0.5.1"
+version = "0.5.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ca8488e272d45adc36db8f6c99d09613f58a7cd06c7b347546c87d9a29ca11e8"
+checksum = "5c998ac5fe2b07c025444bdd522e6258110b63861c6698eedc610c071980238d"
 dependencies = [
  "ethereum-types 0.14.1",
  "ethereum_hashing",
- "smallvec",
+ "smallvec 1.11.0",
 ]
 
 [[package]]
 name = "tree_hash_derive"
-version = "0.5.1"
+version = "0.5.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "83baa26594d96889e5fef7638dfb0f41e16070301a5cf6da99b9a6a0804cec89"
+checksum = "84303a9c7cda5f085a3ed9cd241d1e95e04d88aab1d679b02f212e653537ba86"
 dependencies = [
- "darling 0.13.4",
+ "darling",
  "quote",
  "syn 1.0.109",
 ]
@@ -8784,7 +8457,7 @@ dependencies = [
  "ipnet",
  "lazy_static",
  "rand 0.8.5",
- "smallvec",
+ "smallvec 1.11.0",
  "socket2 0.4.9",
  "thiserror",
  "tinyvec",
@@ -8806,7 +8479,7 @@ dependencies = [
  "lru-cache",
  "parking_lot 0.12.1",
  "resolv-conf",
- "smallvec",
+ "smallvec 1.11.0",
  "thiserror",
  "tokio",
  "tracing",
@@ -8819,25 +8492,6 @@ version = "0.2.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3528ecfd12c466c6f163363caf2d02a71161dd5e1cc6ae7b34207ea2d42d81ed"
 
-[[package]]
-name = "tungstenite"
-version = "0.14.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a0b2d8558abd2e276b0a8df5c05a2ec762609344191e5fd23e292c910e9165b5"
-dependencies = [
- "base64 0.13.1",
- "byteorder",
- "bytes",
- "http",
- "httparse",
- "log",
- "rand 0.8.5",
- "sha-1 0.9.8",
- "thiserror",
- "url",
- "utf-8",
-]
-
 [[package]]
 name = "tungstenite"
 version = "0.17.3"
@@ -8856,35 +8510,26 @@ dependencies = [
  "thiserror",
  "url",
  "utf-8",
- "webpki 0.22.0",
+ "webpki",
 ]
 
 [[package]]
-name = "turn"
-version = "0.6.1"
+name = "tungstenite"
+version = "0.18.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4712ee30d123ec7ae26d1e1b218395a16c87cdbaf4b3925d170d684af62ea5e8"
+checksum = "30ee6ab729cd4cf0fd55218530c4522ed30b7b6081752839b68fcec8d0960788"
 dependencies = [
- "async-trait",
  "base64 0.13.1",
- "futures",
+ "byteorder",
+ "bytes",
+ "http",
+ "httparse",
  "log",
- "md-5",
  "rand 0.8.5",
- "ring",
- "stun",
+ "sha1",
  "thiserror",
- "tokio",
- "webrtc-util",
-]
-
-[[package]]
-name = "twoway"
-version = "0.1.8"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "59b11b2b5241ba34be09c3cc85a36e56e48f9888862e19cedf23336d35316ed1"
-dependencies = [
- "memchr",
+ "url",
+ "utf-8",
 ]
 
 [[package]]
@@ -8920,6 +8565,7 @@ dependencies = [
  "merkle_proof",
  "metastruct",
  "parking_lot 0.12.1",
+ "paste",
  "rand 0.8.5",
  "rand_xorshift",
  "rayon",
@@ -8932,7 +8578,7 @@ dependencies = [
  "serde_with",
  "serde_yaml",
  "slog",
- "smallvec",
+ "smallvec 1.11.0",
  "ssz_types",
  "state_processing",
  "strum",
@@ -8981,9 +8627,9 @@ checksum = "92888ba5573ff080736b3648696b70cafad7d250551175acbaa4e0385b3e1460"
 
 [[package]]
 name = "unicode-ident"
-version = "1.0.8"
+version = "1.0.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e5464a87b239f13a63a501f2701565754bae92d243d4bb7eb12f6d57d2269bf4"
+checksum = "301abaae475aa91687eb82514b328ab47a211a533026cb25fc3e519b86adfc3c"
 
 [[package]]
 name = "unicode-normalization"
@@ -9016,16 +8662,6 @@ dependencies = [
  "subtle",
 ]
 
-[[package]]
-name = "universal-hash"
-version = "0.5.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fc1de2c688dc15305988b563c3854064043356019f97a4b46276fe734c4f07ea"
-dependencies = [
- "crypto-common",
- "subtle",
-]
-
 [[package]]
 name = "unsigned-varint"
 version = "0.6.0"
@@ -9063,12 +8699,12 @@ dependencies = [
 
 [[package]]
 name = "url"
-version = "2.3.1"
+version = "2.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0d68c799ae75762b8c3fe375feb6600ef5602c883c5d21eb51c09f22b83c4643"
+checksum = "50bff7831e19200a85b17131d085c25d7811bc4e186efdaf54bbd132994a88cb"
 dependencies = [
  "form_urlencoded",
- "idna 0.3.0",
+ "idna 0.4.0",
  "percent-encoding",
 ]
 
@@ -9084,19 +8720,10 @@ version = "0.8.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "bc5cf98d8186244414c848017f0e2676b3fcb46807f6668a97dfe67359a3c4b7"
 dependencies = [
- "getrandom 0.2.9",
+ "getrandom 0.2.10",
  "serde",
 ]
 
-[[package]]
-name = "uuid"
-version = "1.3.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "345444e32442451b267fc254ae85a209c64be56d2890e601a0c37ff0c3c5ecd2"
-dependencies = [
- "getrandom 0.2.9",
-]
-
 [[package]]
 name = "validator_client"
 version = "0.3.5"
@@ -9160,6 +8787,7 @@ dependencies = [
  "bls",
  "deposit_contract",
  "derivative",
+ "directory",
  "eth2_keystore",
  "filesystem",
  "hex",
@@ -9170,6 +8798,31 @@ dependencies = [
  "types",
 ]
 
+[[package]]
+name = "validator_manager"
+version = "0.1.0"
+dependencies = [
+ "account_utils",
+ "bls",
+ "clap",
+ "clap_utils",
+ "environment",
+ "eth2",
+ "eth2_keystore",
+ "eth2_network_config",
+ "eth2_wallet",
+ "ethereum_serde_utils",
+ "hex",
+ "regex",
+ "serde",
+ "serde_json",
+ "tempfile",
+ "tokio",
+ "tree_hash",
+ "types",
+ "validator_client",
+]
+
 [[package]]
 name = "valuable"
 version = "0.1.0"
@@ -9200,15 +8853,6 @@ version = "1.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6a02e4885ed3bc0f2de90ea6dd45ebcbb66dacffe03547fadbb0eeae2770887d"
 
-[[package]]
-name = "waitgroup"
-version = "0.1.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d1f50000a783467e6c0200f9d10642f4bc424e39efc1b770203e88b488f79292"
-dependencies = [
- "atomic-waker",
-]
-
 [[package]]
 name = "waker-fn"
 version = "1.1.0"
@@ -9227,18 +8871,17 @@ dependencies = [
 
 [[package]]
 name = "want"
-version = "0.3.0"
+version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1ce8a968cb1cd110d136ff8b819a556d6fb6d919363c61534f6860c7eb172ba0"
+checksum = "bfa7760aed19e106de2c7c0b581b509f2f25d3dacaf737cb82ac61bc6d760b0e"
 dependencies = [
- "log",
  "try-lock",
 ]
 
 [[package]]
 name = "warp"
-version = "0.3.2"
-source = "git+https://github.com/macladson/warp?rev=7e75acc368229a46a236a8c991bf251fe7fe50ef#7e75acc368229a46a236a8c991bf251fe7fe50ef"
+version = "0.3.5"
+source = "git+https://github.com/seanmonstar/warp.git?rev=149913fe#149913fed948bbe2149b52b9016170bcaef950ab"
 dependencies = [
  "bytes",
  "futures-channel",
@@ -9249,18 +8892,19 @@ dependencies = [
  "log",
  "mime",
  "mime_guess",
- "multipart",
+ "multer",
  "percent-encoding",
  "pin-project",
+ "rustls-pemfile",
  "scoped-tls",
  "serde",
  "serde_json",
  "serde_urlencoded",
  "tokio",
- "tokio-rustls 0.22.0",
+ "tokio-rustls 0.23.4",
  "tokio-stream",
- "tokio-tungstenite 0.15.0",
- "tokio-util 0.6.10",
+ "tokio-tungstenite 0.18.0",
+ "tokio-util 0.7.8",
  "tower-service",
  "tracing",
 ]
@@ -9289,12 +8933,6 @@ version = "0.9.0+wasi-snapshot-preview1"
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 checksum = "cccddf32554fecc6acb585f82a32a72e28b48f8c4c1883ddfeeeaa96f7d8e519"
 
-[[package]]
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-version = "0.10.0+wasi-snapshot-preview1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1a143597ca7c7793eff794def352d41792a93c481eb1042423ff7ff72ba2c31f"
-
 [[package]]
 name = "wasi"
 version = "0.11.0+wasi-snapshot-preview1"
@@ -9303,9 +8941,9 @@ checksum = "9c8d87e72b64a3b4db28d11ce29237c246188f4f51057d65a7eab63b7987e423"
 
 [[package]]
 name = "wasm-bindgen"
-version = "0.2.86"
+version = "0.2.87"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5bba0e8cb82ba49ff4e229459ff22a191bbe9a1cb3a341610c9c33efc27ddf73"
+checksum = "7706a72ab36d8cb1f80ffbf0e071533974a60d0a308d01a5d0375bf60499a342"
 dependencies = [
  "cfg-if",
  "wasm-bindgen-macro",
@@ -9313,24 +8951,24 @@ dependencies = [
 
 [[package]]
 name = "wasm-bindgen-backend"
-version = "0.2.86"
+version = "0.2.87"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "19b04bc93f9d6bdee709f6bd2118f57dd6679cf1176a1af464fca3ab0d66d8fb"
+checksum = "5ef2b6d3c510e9625e5fe6f509ab07d66a760f0885d858736483c32ed7809abd"
 dependencies = [
  "bumpalo",
  "log",
  "once_cell",
  "proc-macro2",
  "quote",
- "syn 2.0.16",
+ "syn 2.0.29",
  "wasm-bindgen-shared",
 ]
 
 [[package]]
 name = "wasm-bindgen-futures"
-version = "0.4.36"
+version = "0.4.37"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2d1985d03709c53167ce907ff394f5316aa22cb4e12761295c5dc57dacb6297e"
+checksum = "c02dbc21516f9f1f04f187958890d7e6026df8d16540b7ad9492bc34a67cea03"
 dependencies = [
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  "js-sys",
@@ -9340,9 +8978,9 @@ dependencies = [
 
 [[package]]
 name = "wasm-bindgen-macro"
-version = "0.2.86"
+version = "0.2.87"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "14d6b024f1a526bb0234f52840389927257beb670610081360e5a03c5df9c258"
+checksum = "dee495e55982a3bd48105a7b947fd2a9b4a8ae3010041b9e0faab3f9cd028f1d"
 dependencies = [
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  "wasm-bindgen-macro-support",
@@ -9350,22 +8988,22 @@ dependencies = [
 
 [[package]]
 name = "wasm-bindgen-macro-support"
-version = "0.2.86"
+version = "0.2.87"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e128beba882dd1eb6200e1dc92ae6c5dbaa4311aa7bb211ca035779e5efc39f8"
+checksum = "54681b18a46765f095758388f2d0cf16eb8d4169b639ab575a8f5693af210c7b"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.16",
+ "syn 2.0.29",
  "wasm-bindgen-backend",
  "wasm-bindgen-shared",
 ]
 
 [[package]]
 name = "wasm-bindgen-shared"
-version = "0.2.86"
+version = "0.2.87"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ed9d5b4305409d1fc9482fee2d7f9bcbf24b3972bf59817ef757e23982242a93"
+checksum = "ca6ad05a4870b2bf5fe995117d3728437bd27d7cd5f06f13c17443ef369775a1"
 
 [[package]]
 name = "wasm-streams"
@@ -9413,6 +9051,7 @@ dependencies = [
  "http_api",
  "hyper",
  "log",
+ "logging",
  "network",
  "r2d2",
  "rand 0.7.3",
@@ -9420,6 +9059,7 @@ dependencies = [
  "serde",
  "serde_json",
  "serde_yaml",
+ "task_executor",
  "testcontainers",
  "tokio",
  "tokio-postgres",
@@ -9430,9 +9070,9 @@ dependencies = [
 
 [[package]]
 name = "web-sys"
-version = "0.3.63"
+version = "0.3.64"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3bdd9ef4e984da1187bf8110c5cf5b845fbc87a23602cdf912386a76fcd3a7c2"
+checksum = "9b85cbef8c220a6abc02aefd892dfc0fc23afb1c6a426316ec33253a3877249b"
 dependencies = [
  "js-sys",
  "wasm-bindgen",
@@ -9465,16 +9105,6 @@ dependencies = [
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 ]
 
-[[package]]
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-version = "0.21.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b8e38c0608262c46d4a56202ebabdeb094cef7e560ca7a226c6bf055188aa4ea"
-dependencies = [
- "ring",
- "untrusted",
-]
-
 [[package]]
 name = "webpki"
 version = "0.22.0"
@@ -9491,227 +9121,14 @@ version = "0.22.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b6c71e40d7d2c34a5106301fb632274ca37242cd0c9d3e64dbece371a40a2d87"
 dependencies = [
- "webpki 0.22.0",
+ "webpki",
 ]
 
 [[package]]
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-version = "0.6.0"
+name = "webpki-roots"
+version = "0.25.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
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- "log",
- "rand 0.8.5",
- "rcgen 0.9.3",
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- "rustls 0.19.1",
- "sdp",
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- "stun",
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- "webrtc-ice",
- "webrtc-mdns",
- "webrtc-media",
- "webrtc-sctp",
- "webrtc-srtp",
- "webrtc-util",
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-
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-
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- "tokio",
- "webrtc-util",
-]
-
-[[package]]
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- "lazy_static",
- "libc",
- "log",
- "nix 0.24.3",
- "rand 0.8.5",
- "thiserror",
- "tokio",
- "winapi",
-]
-
-[[package]]
-name = "which"
-version = "4.4.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2441c784c52b289a054b7201fc93253e288f094e2f4be9058343127c4226a269"
-dependencies = [
- "either",
- "libc",
- "once_cell",
-]
+checksum = "14247bb57be4f377dfb94c72830b8ce8fc6beac03cf4bf7b9732eadd414123fc"
 
 [[package]]
 name = "widestring"
@@ -9721,9 +9138,9 @@ checksum = "c168940144dd21fd8046987c16a46a33d5fc84eec29ef9dcddc2ac9e31526b7c"
 
 [[package]]
 name = "widestring"
-version = "0.5.1"
+version = "1.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "17882f045410753661207383517a6f62ec3dbeb6a4ed2acce01f0728238d1983"
+checksum = "653f141f39ec16bba3c5abe400a0c60da7468261cc2cbf36805022876bc721a8"
 
 [[package]]
 name = "wildmatch"
@@ -9781,7 +9198,7 @@ version = "0.48.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e686886bc078bc1b0b600cac0147aadb815089b6e4da64016cbd754b6342700f"
 dependencies = [
- "windows-targets 0.48.0",
+ "windows-targets 0.48.3",
 ]
 
 [[package]]
@@ -9796,21 +9213,6 @@ dependencies = [
  "winapi",
 ]
 
-[[package]]
-name = "windows-sys"
-version = "0.42.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5a3e1820f08b8513f676f7ab6c1f99ff312fb97b553d30ff4dd86f9f15728aa7"
-dependencies = [
- "windows_aarch64_gnullvm 0.42.2",
- "windows_aarch64_msvc 0.42.2",
- "windows_i686_gnu 0.42.2",
- "windows_i686_msvc 0.42.2",
- "windows_x86_64_gnu 0.42.2",
- "windows_x86_64_gnullvm 0.42.2",
- "windows_x86_64_msvc 0.42.2",
-]
-
 [[package]]
 name = "windows-sys"
 version = "0.45.0"
@@ -9826,7 +9228,7 @@ version = "0.48.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "677d2418bec65e3338edb076e806bc1ec15693c5d0104683f2efe857f61056a9"
 dependencies = [
- "windows-targets 0.48.0",
+ "windows-targets 0.48.3",
 ]
 
 [[package]]
@@ -9846,17 +9248,17 @@ dependencies = [
 
 [[package]]
 name = "windows-targets"
-version = "0.48.0"
+version = "0.48.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7b1eb6f0cd7c80c79759c929114ef071b87354ce476d9d94271031c0497adfd5"
+checksum = "27f51fb4c64f8b770a823c043c7fad036323e1c48f55287b7bbb7987b2fcdf3b"
 dependencies = [
- "windows_aarch64_gnullvm 0.48.0",
- "windows_aarch64_msvc 0.48.0",
- "windows_i686_gnu 0.48.0",
- "windows_i686_msvc 0.48.0",
- "windows_x86_64_gnu 0.48.0",
- "windows_x86_64_gnullvm 0.48.0",
- "windows_x86_64_msvc 0.48.0",
+ "windows_aarch64_gnullvm 0.48.3",
+ "windows_aarch64_msvc 0.48.3",
+ "windows_i686_gnu 0.48.3",
+ "windows_i686_msvc 0.48.3",
+ "windows_x86_64_gnu 0.48.3",
+ "windows_x86_64_gnullvm 0.48.3",
+ "windows_x86_64_msvc 0.48.3",
 ]
 
 [[package]]
@@ -9867,9 +9269,9 @@ checksum = "597a5118570b68bc08d8d59125332c54f1ba9d9adeedeef5b99b02ba2b0698f8"
 
 [[package]]
 name = "windows_aarch64_gnullvm"
-version = "0.48.0"
+version = "0.48.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "91ae572e1b79dba883e0d315474df7305d12f569b400fcf90581b06062f7e1bc"
+checksum = "fde1bb55ae4ce76a597a8566d82c57432bc69c039449d61572a7a353da28f68c"
 
 [[package]]
 name = "windows_aarch64_msvc"
@@ -9885,9 +9287,9 @@ checksum = "e08e8864a60f06ef0d0ff4ba04124db8b0fb3be5776a5cd47641e942e58c4d43"
 
 [[package]]
 name = "windows_aarch64_msvc"
-version = "0.48.0"
+version = "0.48.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b2ef27e0d7bdfcfc7b868b317c1d32c641a6fe4629c171b8928c7b08d98d7cf3"
+checksum = "1513e8d48365a78adad7322fd6b5e4c4e99d92a69db8df2d435b25b1f1f286d4"
 
 [[package]]
 name = "windows_i686_gnu"
@@ -9903,9 +9305,9 @@ checksum = "c61d927d8da41da96a81f029489353e68739737d3beca43145c8afec9a31a84f"
 
 [[package]]
 name = "windows_i686_gnu"
-version = "0.48.0"
+version = "0.48.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "622a1962a7db830d6fd0a69683c80a18fda201879f0f447f065a3b7467daa241"
+checksum = "60587c0265d2b842298f5858e1a5d79d146f9ee0c37be5782e92a6eb5e1d7a83"
 
 [[package]]
 name = "windows_i686_msvc"
@@ -9921,9 +9323,9 @@ checksum = "44d840b6ec649f480a41c8d80f9c65108b92d89345dd94027bfe06ac444d1060"
 
 [[package]]
 name = "windows_i686_msvc"
-version = "0.48.0"
+version = "0.48.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4542c6e364ce21bf45d69fdd2a8e455fa38d316158cfd43b3ac1c5b1b19f8e00"
+checksum = "224fe0e0ffff5d2ea6a29f82026c8f43870038a0ffc247aa95a52b47df381ac4"
 
 [[package]]
 name = "windows_x86_64_gnu"
@@ -9939,9 +9341,9 @@ checksum = "8de912b8b8feb55c064867cf047dda097f92d51efad5b491dfb98f6bbb70cb36"
 
 [[package]]
 name = "windows_x86_64_gnu"
-version = "0.48.0"
+version = "0.48.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ca2b8a661f7628cbd23440e50b05d705db3686f894fc9580820623656af974b1"
+checksum = "62fc52a0f50a088de499712cbc012df7ebd94e2d6eb948435449d76a6287e7ad"
 
 [[package]]
 name = "windows_x86_64_gnullvm"
@@ -9951,9 +9353,9 @@ checksum = "26d41b46a36d453748aedef1486d5c7a85db22e56aff34643984ea85514e94a3"
 
 [[package]]
 name = "windows_x86_64_gnullvm"
-version = "0.48.0"
+version = "0.48.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7896dbc1f41e08872e9d5e8f8baa8fdd2677f29468c4e156210174edc7f7b953"
+checksum = "2093925509d91ea3d69bcd20238f4c2ecdb1a29d3c281d026a09705d0dd35f3d"
 
 [[package]]
 name = "windows_x86_64_msvc"
@@ -9969,9 +9371,18 @@ checksum = "9aec5da331524158c6d1a4ac0ab1541149c0b9505fde06423b02f5ef0106b9f0"
 
 [[package]]
 name = "windows_x86_64_msvc"
-version = "0.48.0"
+version = "0.48.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1a515f5799fe4961cb532f983ce2b23082366b898e52ffbce459c86f67c8378a"
+checksum = "b6ade45bc8bf02ae2aa34a9d54ba660a1a58204da34ba793c00d83ca3730b5f1"
+
+[[package]]
+name = "winnow"
+version = "0.5.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d09770118a7eb1ccaf4a594a221334119a44a814fcb0d31c5b85e83e97227a97"
+dependencies = [
+ "memchr",
+]
 
 [[package]]
 name = "winreg"
@@ -9982,6 +9393,16 @@ dependencies = [
  "winapi",
 ]
 
+[[package]]
+name = "winreg"
+version = "0.50.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "524e57b2c537c0f9b1e69f1965311ec12182b4122e45035b1508cd24d2adadb1"
+dependencies = [
+ "cfg-if",
+ "windows-sys 0.48.0",
+]
+
 [[package]]
 name = "ws_stream_wasm"
 version = "0.7.4"
@@ -9993,7 +9414,7 @@ dependencies = [
  "js-sys",
  "log",
  "pharos",
- "rustc_version 0.4.0",
+ "rustc_version",
  "send_wrapper",
  "thiserror",
  "wasm-bindgen",
@@ -10027,60 +9448,28 @@ dependencies = [
  "zeroize",
 ]
 
-[[package]]
-name = "x25519-dalek"
-version = "2.0.0-rc.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fabd6e16dd08033932fc3265ad4510cc2eab24656058a6dcb107ffe274abcc95"
-dependencies = [
- "curve25519-dalek 4.0.0-rc.2",
- "rand_core 0.6.4",
- "serde",
- "zeroize",
-]
-
 [[package]]
 name = "x509-parser"
-version = "0.13.2"
+version = "0.15.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9fb9bace5b5589ffead1afb76e43e34cff39cd0f3ce7e170ae0c29e53b88eb1c"
+checksum = "7069fba5b66b9193bd2c5d3d4ff12b839118f6bcbef5328efafafb5395cf63da"
 dependencies = [
- "asn1-rs 0.3.1",
- "base64 0.13.1",
+ "asn1-rs",
  "data-encoding",
- "der-parser 7.0.0",
+ "der-parser",
  "lazy_static",
- "nom 7.1.3",
- "oid-registry 0.4.0",
- "ring",
+ "nom",
+ "oid-registry",
  "rusticata-macros",
  "thiserror",
- "time 0.3.21",
-]
-
-[[package]]
-name = "x509-parser"
-version = "0.14.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e0ecbeb7b67ce215e40e3cc7f2ff902f94a223acf44995934763467e7b1febc8"
-dependencies = [
- "asn1-rs 0.5.2",
- "base64 0.13.1",
- "data-encoding",
- "der-parser 8.2.0",
- "lazy_static",
- "nom 7.1.3",
- "oid-registry 0.6.1",
- "rusticata-macros",
- "thiserror",
- "time 0.3.21",
+ "time",
 ]
 
 [[package]]
 name = "xml-rs"
-version = "0.8.11"
+version = "0.8.16"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1690519550bfa95525229b9ca2350c63043a4857b3b0013811b2ccf4a2420b01"
+checksum = "47430998a7b5d499ccee752b41567bc3afc57e1327dc855b1a2aa44ce29b5fa1"
 
 [[package]]
 name = "xmltree"
@@ -10102,14 +9491,15 @@ dependencies = [
 
 [[package]]
 name = "yamux"
-version = "0.10.2"
+version = "0.12.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e5d9ba232399af1783a58d8eb26f6b5006fbefe2dc9ef36bd283324792d03ea5"
+checksum = "0329ef377816896f014435162bb3711ea7a07729c23d0960e6f8048b21b8fe91"
 dependencies = [
  "futures",
  "log",
  "nohash-hasher",
  "parking_lot 0.12.1",
+ "pin-project",
  "rand 0.8.5",
  "static_assertions",
 ]
@@ -10120,7 +9510,7 @@ version = "0.5.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e17bb3549cc1321ae1296b9cdc2698e2b6cb1992adfa19a8c72e5b7a738f44cd"
 dependencies = [
- "time 0.3.21",
+ "time",
 ]
 
 [[package]]
@@ -10140,19 +9530,55 @@ checksum = "ce36e65b0d2999d2aafac989fb249189a141aee1f53c612c1f37d72631959f69"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.16",
+ "syn 2.0.29",
 ]
 
 [[package]]
 name = "zip"
-version = "0.5.13"
+version = "0.6.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "93ab48844d61251bb3835145c521d88aa4031d7139e8485990f60ca911fa0815"
+checksum = "760394e246e4c28189f19d488c058bf16f564016aefac5d32bb1f3b51d5e9261"
 dependencies = [
+ "aes 0.8.3",
  "byteorder",
  "bzip2",
+ "constant_time_eq",
  "crc32fast",
+ "crossbeam-utils",
  "flate2",
- "thiserror",
- "time 0.1.45",
+ "hmac 0.12.1",
+ "pbkdf2 0.11.0",
+ "sha1",
+ "time",
+ "zstd",
+]
+
+[[package]]
+name = "zstd"
+version = "0.11.2+zstd.1.5.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "20cc960326ece64f010d2d2107537f26dc589a6573a316bd5b1dba685fa5fde4"
+dependencies = [
+ "zstd-safe",
+]
+
+[[package]]
+name = "zstd-safe"
+version = "5.0.2+zstd.1.5.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1d2a5585e04f9eea4b2a3d1eca508c4dee9592a89ef6f450c11719da0726f4db"
+dependencies = [
+ "libc",
+ "zstd-sys",
+]
+
+[[package]]
+name = "zstd-sys"
+version = "2.0.8+zstd.1.5.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5556e6ee25d32df2586c098bbfa278803692a20d0ab9565e049480d52707ec8c"
+dependencies = [
+ "cc",
+ "libc",
+ "pkg-config",
 ]
diff --git a/Cargo.toml b/Cargo.toml
index 5c39e01ed1..9930658e65 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -4,6 +4,7 @@ members = [
 
     "beacon_node",
     "beacon_node/beacon_chain",
+    "beacon_node/beacon_processor",
     "beacon_node/builder_client",
     "beacon_node/client",
     "beacon_node/eth1",
@@ -82,21 +83,16 @@ members = [
     "validator_client",
     "validator_client/slashing_protection",
 
+    "validator_manager",
+
     "watch",
 ]
 resolver = "2"
 
 [patch]
 [patch.crates-io]
-warp = { git = "https://github.com/macladson/warp", rev="7e75acc368229a46a236a8c991bf251fe7fe50ef" }
-arbitrary = { git = "https://github.com/michaelsproul/arbitrary", rev="f002b99989b561ddce62e4cf2887b0f8860ae991" }
-
-[patch."https://github.com/ralexstokes/mev-rs"]
-mev-rs = { git = "https://github.com/ralexstokes//mev-rs", rev = "7813d4a4a564e0754e9aaab2d95520ba437c3889" }
-[patch."https://github.com/ralexstokes/ethereum-consensus"]
-ethereum-consensus = { git = "https://github.com/ralexstokes//ethereum-consensus", rev = "9b0ee0a8a45b968c8df5e7e64ea1c094e16f053d" }
-[patch."https://github.com/ralexstokes/ssz-rs"]
-ssz-rs = { git = "https://github.com/ralexstokes//ssz-rs", rev = "adf1a0b14cef90b9536f28ef89da1fab316465e1" }
+# TODO: remove when 0.3.6 get's released.
+warp = { git = "https://github.com/seanmonstar/warp.git", rev="149913fe" }
 
 [profile.maxperf]
 inherits = "release"
diff --git a/Cross.toml b/Cross.toml
index 9c3e441cba..d5f7a5d506 100644
--- a/Cross.toml
+++ b/Cross.toml
@@ -1,5 +1,5 @@
 [target.x86_64-unknown-linux-gnu]
-dockerfile = './scripts/cross/Dockerfile'
+pre-build = ["apt-get install -y cmake clang-3.9"]
 
 [target.aarch64-unknown-linux-gnu]
-dockerfile = './scripts/cross/Dockerfile'
+pre-build = ["apt-get install -y cmake clang-3.9"]
diff --git a/Dockerfile b/Dockerfile
index be01ad7c57..f07c42dd85 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,5 +1,5 @@
 FROM rust:1.68.2-bullseye AS builder
-RUN apt-get update && apt-get -y upgrade && apt-get install -y cmake libclang-dev protobuf-compiler
+RUN apt-get update && apt-get -y upgrade && apt-get install -y cmake libclang-dev
 COPY . lighthouse
 ARG FEATURES
 ARG PROFILE=release
@@ -13,4 +13,4 @@ RUN apt-get update && apt-get -y upgrade && apt-get install -y --no-install-reco
   ca-certificates \
   && apt-get clean \
   && rm -rf /var/lib/apt/lists/*
-COPY --from=builder /usr/local/cargo/bin/lighthouse /usr/local/bin/lighthouse
+COPY --from=builder /usr/local/cargo/bin/lighthouse /usr/local/bin/lighthouse
\ No newline at end of file
diff --git a/Makefile b/Makefile
index 440fabf1d8..b5b64a91f0 100644
--- a/Makefile
+++ b/Makefile
@@ -71,13 +71,13 @@ install-lcli:
 # optimized CPU functions that may not be available on some systems. This
 # results in a more portable binary with ~20% slower BLS verification.
 build-x86_64:
-	cross build --bin lighthouse --target x86_64-unknown-linux-gnu --features "modern,$(CROSS_FEATURES)" --profile "$(CROSS_PROFILE)"
+	cross build --bin lighthouse --target x86_64-unknown-linux-gnu --features "modern,$(CROSS_FEATURES)" --profile "$(CROSS_PROFILE)" --locked
 build-x86_64-portable:
-	cross build --bin lighthouse --target x86_64-unknown-linux-gnu --features "portable,$(CROSS_FEATURES)" --profile "$(CROSS_PROFILE)"
+	cross build --bin lighthouse --target x86_64-unknown-linux-gnu --features "portable,$(CROSS_FEATURES)" --profile "$(CROSS_PROFILE)" --locked
 build-aarch64:
-	cross build --bin lighthouse --target aarch64-unknown-linux-gnu --features "$(CROSS_FEATURES)" --profile "$(CROSS_PROFILE)"
+	cross build --bin lighthouse --target aarch64-unknown-linux-gnu --features "$(CROSS_FEATURES)" --profile "$(CROSS_PROFILE)" --locked
 build-aarch64-portable:
-	cross build --bin lighthouse --target aarch64-unknown-linux-gnu --features "portable,$(CROSS_FEATURES)" --profile "$(CROSS_PROFILE)"
+	cross build --bin lighthouse --target aarch64-unknown-linux-gnu --features "portable,$(CROSS_FEATURES)" --profile "$(CROSS_PROFILE)" --locked
 
 # Create a `.tar.gz` containing a binary for a specific target.
 define tarball_release_binary
@@ -211,7 +211,7 @@ arbitrary-fuzz:
 # Runs cargo audit (Audit Cargo.lock files for crates with security vulnerabilities reported to the RustSec Advisory Database)
 audit:
 	cargo install --force cargo-audit
-	cargo audit --ignore RUSTSEC-2020-0071
+	cargo audit --ignore RUSTSEC-2023-0052
 
 # Runs `cargo vendor` to make sure dependencies can be vendored for packaging, reproducibility and archival purpose.
 vendor:
diff --git a/account_manager/Cargo.toml b/account_manager/Cargo.toml
index ce863f9147..238e4a77e0 100644
--- a/account_manager/Cargo.toml
+++ b/account_manager/Cargo.toml
@@ -1,7 +1,10 @@
 [package]
 name = "account_manager"
 version = "0.3.5"
-authors = ["Paul Hauner <paul@paulhauner.com>", "Luke Anderson <luke@sigmaprime.io>"]
+authors = [
+    "Paul Hauner <paul@paulhauner.com>",
+    "Luke Anderson <luke@sigmaprime.io>",
+]
 edition = "2021"
 
 [dependencies]
@@ -19,11 +22,14 @@ tokio = { version = "1.14.0", features = ["full"] }
 eth2_keystore = { path = "../crypto/eth2_keystore" }
 account_utils = { path = "../common/account_utils" }
 slashing_protection = { path = "../validator_client/slashing_protection" }
-eth2 = {path = "../common/eth2"}
-safe_arith = {path = "../consensus/safe_arith"}
+eth2 = { path = "../common/eth2" }
+safe_arith = { path = "../consensus/safe_arith" }
 slot_clock = { path = "../common/slot_clock" }
 filesystem = { path = "../common/filesystem" }
 sensitive_url = { path = "../common/sensitive_url" }
+serde = { version = "1.0.116", features = ["derive"] }
+serde_json = "1.0.58"
+slog = { version = "2.5.2" }
 
 [dev-dependencies]
 tempfile = "3.1.0"
diff --git a/account_manager/src/common.rs b/account_manager/src/common.rs
index ce42615e50..0764db21f3 100644
--- a/account_manager/src/common.rs
+++ b/account_manager/src/common.rs
@@ -1,55 +1,7 @@
-use account_utils::PlainText;
-use account_utils::{read_input_from_user, strip_off_newlines};
-use eth2_wallet::bip39::{Language, Mnemonic};
-use std::fs;
-use std::path::PathBuf;
-use std::str::from_utf8;
-use std::thread::sleep;
-use std::time::Duration;
+use account_utils::read_input_from_user;
 
-pub const MNEMONIC_PROMPT: &str = "Enter the mnemonic phrase:";
 pub const WALLET_NAME_PROMPT: &str = "Enter wallet name:";
 
-pub fn read_mnemonic_from_cli(
-    mnemonic_path: Option<PathBuf>,
-    stdin_inputs: bool,
-) -> Result<Mnemonic, String> {
-    let mnemonic = match mnemonic_path {
-        Some(path) => fs::read(&path)
-            .map_err(|e| format!("Unable to read {:?}: {:?}", path, e))
-            .and_then(|bytes| {
-                let bytes_no_newlines: PlainText = strip_off_newlines(bytes).into();
-                let phrase = from_utf8(bytes_no_newlines.as_ref())
-                    .map_err(|e| format!("Unable to derive mnemonic: {:?}", e))?;
-                Mnemonic::from_phrase(phrase, Language::English).map_err(|e| {
-                    format!(
-                        "Unable to derive mnemonic from string {:?}: {:?}",
-                        phrase, e
-                    )
-                })
-            })?,
-        None => loop {
-            eprintln!();
-            eprintln!("{}", MNEMONIC_PROMPT);
-
-            let mnemonic = read_input_from_user(stdin_inputs)?;
-
-            match Mnemonic::from_phrase(mnemonic.as_str(), Language::English) {
-                Ok(mnemonic_m) => {
-                    eprintln!("Valid mnemonic provided.");
-                    eprintln!();
-                    sleep(Duration::from_secs(1));
-                    break mnemonic_m;
-                }
-                Err(_) => {
-                    eprintln!("Invalid mnemonic");
-                }
-            }
-        },
-    };
-    Ok(mnemonic)
-}
-
 /// Reads in a wallet name from the user. If the `--wallet-name` flag is provided, use it. Otherwise
 /// read from an interactive prompt using tty unless the `--stdin-inputs` flag is provided.
 pub fn read_wallet_name_from_cli(
diff --git a/account_manager/src/validator/exit.rs b/account_manager/src/validator/exit.rs
index 5755a355f3..1ff61a7c01 100644
--- a/account_manager/src/validator/exit.rs
+++ b/account_manager/src/validator/exit.rs
@@ -10,6 +10,7 @@ use eth2_keystore::Keystore;
 use eth2_network_config::Eth2NetworkConfig;
 use safe_arith::SafeArith;
 use sensitive_url::SensitiveUrl;
+use slog::Logger;
 use slot_clock::{SlotClock, SystemTimeSlotClock};
 use std::path::{Path, PathBuf};
 use std::time::Duration;
@@ -78,6 +79,12 @@ pub fn cli_run<E: EthSpec>(matches: &ArgMatches, env: Environment<E>) -> Result<
     let password_file_path: Option<PathBuf> =
         clap_utils::parse_optional(matches, PASSWORD_FILE_FLAG)?;
 
+    let genesis_state_url: Option<String> =
+        clap_utils::parse_optional(matches, "genesis-state-url")?;
+    let genesis_state_url_timeout =
+        clap_utils::parse_required(matches, "genesis-state-url-timeout")
+            .map(Duration::from_secs)?;
+
     let stdin_inputs = cfg!(windows) || matches.is_present(STDIN_INPUTS_FLAG);
     let no_wait = matches.is_present(NO_WAIT);
     let no_confirmation = matches.is_present(NO_CONFIRMATION);
@@ -104,6 +111,9 @@ pub fn cli_run<E: EthSpec>(matches: &ArgMatches, env: Environment<E>) -> Result<
         &eth2_network_config,
         no_wait,
         no_confirmation,
+        genesis_state_url,
+        genesis_state_url_timeout,
+        env.core_context().log(),
     ))?;
 
     Ok(())
@@ -120,13 +130,14 @@ async fn publish_voluntary_exit<E: EthSpec>(
     eth2_network_config: &Eth2NetworkConfig,
     no_wait: bool,
     no_confirmation: bool,
+    genesis_state_url: Option<String>,
+    genesis_state_url_timeout: Duration,
+    log: &Logger,
 ) -> Result<(), String> {
     let genesis_data = get_geneisis_data(client).await?;
     let testnet_genesis_root = eth2_network_config
-        .beacon_state::<E>()
-        .as_ref()
-        .expect("network should have valid genesis state")
-        .genesis_validators_root();
+        .genesis_validators_root::<E>(genesis_state_url.as_deref(), genesis_state_url_timeout, log)?
+        .ok_or("Genesis state is unknown")?;
 
     // Verify that the beacon node and validator being exited are on the same network.
     if genesis_data.genesis_validators_root != testnet_genesis_root {
diff --git a/account_manager/src/validator/import.rs b/account_manager/src/validator/import.rs
index 8dc50a9df1..339d9a2914 100644
--- a/account_manager/src/validator/import.rs
+++ b/account_manager/src/validator/import.rs
@@ -4,8 +4,8 @@ use account_utils::{
     eth2_keystore::Keystore,
     read_password_from_user,
     validator_definitions::{
-        recursively_find_voting_keystores, ValidatorDefinition, ValidatorDefinitions,
-        CONFIG_FILENAME,
+        recursively_find_voting_keystores, PasswordStorage, ValidatorDefinition,
+        ValidatorDefinitions, CONFIG_FILENAME,
     },
     ZeroizeString,
 };
@@ -277,7 +277,9 @@ pub fn cli_run(matches: &ArgMatches, validator_dir: PathBuf) -> Result<(), Strin
         let suggested_fee_recipient = None;
         let validator_def = ValidatorDefinition::new_keystore_with_password(
             &dest_keystore,
-            password_opt,
+            password_opt
+                .map(PasswordStorage::ValidatorDefinitions)
+                .unwrap_or(PasswordStorage::None),
             graffiti,
             suggested_fee_recipient,
             None,
diff --git a/account_manager/src/validator/recover.rs b/account_manager/src/validator/recover.rs
index d9b05e7756..33d3b18926 100644
--- a/account_manager/src/validator/recover.rs
+++ b/account_manager/src/validator/recover.rs
@@ -1,10 +1,9 @@
 use super::create::STORE_WITHDRAW_FLAG;
-use crate::common::read_mnemonic_from_cli;
 use crate::validator::create::COUNT_FLAG;
 use crate::wallet::create::STDIN_INPUTS_FLAG;
 use crate::SECRETS_DIR_FLAG;
 use account_utils::eth2_keystore::{keypair_from_secret, Keystore, KeystoreBuilder};
-use account_utils::random_password;
+use account_utils::{random_password, read_mnemonic_from_cli};
 use clap::{App, Arg, ArgMatches};
 use directory::ensure_dir_exists;
 use directory::{parse_path_or_default_with_flag, DEFAULT_SECRET_DIR};
diff --git a/account_manager/src/validator/slashing_protection.rs b/account_manager/src/validator/slashing_protection.rs
index f25bbd8159..570f29b4ad 100644
--- a/account_manager/src/validator/slashing_protection.rs
+++ b/account_manager/src/validator/slashing_protection.rs
@@ -7,7 +7,8 @@ use slashing_protection::{
 use std::fs::File;
 use std::path::PathBuf;
 use std::str::FromStr;
-use types::{BeaconState, Epoch, EthSpec, PublicKeyBytes, Slot};
+use std::time::Duration;
+use types::{Epoch, EthSpec, PublicKeyBytes, Slot};
 
 pub const CMD: &str = "slashing-protection";
 pub const IMPORT_CMD: &str = "import";
@@ -82,19 +83,24 @@ pub fn cli_run<T: EthSpec>(
 ) -> Result<(), String> {
     let slashing_protection_db_path = validator_base_dir.join(SLASHING_PROTECTION_FILENAME);
 
+    let genesis_state_url: Option<String> =
+        clap_utils::parse_optional(matches, "genesis-state-url")?;
+    let genesis_state_url_timeout =
+        clap_utils::parse_required(matches, "genesis-state-url-timeout")
+            .map(Duration::from_secs)?;
+
+    let context = env.core_context();
     let eth2_network_config = env
         .eth2_network_config
         .ok_or("Unable to get testnet configuration from the environment")?;
 
     let genesis_validators_root = eth2_network_config
-        .beacon_state::<T>()
-        .map(|state: BeaconState<T>| state.genesis_validators_root())
-        .map_err(|e| {
-            format!(
-                "Unable to get genesis state, has genesis occurred? Detail: {:?}",
-                e
-            )
-        })?;
+        .genesis_validators_root::<T>(
+            genesis_state_url.as_deref(),
+            genesis_state_url_timeout,
+            context.log(),
+        )?
+        .ok_or_else(|| "Unable to get genesis state, has genesis occurred?".to_string())?;
 
     match matches.subcommand() {
         (IMPORT_CMD, Some(matches)) => {
diff --git a/account_manager/src/wallet/recover.rs b/account_manager/src/wallet/recover.rs
index f107c3638c..6e047aca8d 100644
--- a/account_manager/src/wallet/recover.rs
+++ b/account_manager/src/wallet/recover.rs
@@ -1,6 +1,6 @@
-use crate::common::read_mnemonic_from_cli;
 use crate::wallet::create::{create_wallet_from_mnemonic, STDIN_INPUTS_FLAG};
 use crate::wallet::create::{HD_TYPE, NAME_FLAG, PASSWORD_FLAG, TYPE_FLAG};
+use account_utils::read_mnemonic_from_cli;
 use clap::{App, Arg, ArgMatches};
 use std::path::PathBuf;
 
diff --git a/beacon_node/Cargo.toml b/beacon_node/Cargo.toml
index 7c74365418..3f4c93fa4d 100644
--- a/beacon_node/Cargo.toml
+++ b/beacon_node/Cargo.toml
@@ -1,7 +1,10 @@
 [package]
 name = "beacon_node"
-version = "4.3.0"
-authors = ["Paul Hauner <paul@paulhauner.com>", "Age Manning <Age@AgeManning.com"]
+version = "4.4.1"
+authors = [
+    "Paul Hauner <paul@paulhauner.com>",
+    "Age Manning <Age@AgeManning.com",
+]
 edition = "2021"
 
 [lib]
@@ -12,7 +15,9 @@ path = "src/lib.rs"
 node_test_rig = { path = "../testing/node_test_rig" }
 
 [features]
-write_ssz_files = ["beacon_chain/write_ssz_files"]  # Writes debugging .ssz files to /tmp during block processing.
+write_ssz_files = [
+    "beacon_chain/write_ssz_files",
+] # Writes debugging .ssz files to /tmp during block processing.
 
 [dependencies]
 eth2_config = { path = "../common/eth2_config" }
@@ -21,9 +26,12 @@ types = { path = "../consensus/types" }
 store = { path = "./store" }
 client = { path = "client" }
 clap = "2.33.3"
-slog = { version = "2.5.2", features = ["max_level_trace", "release_max_level_trace"] }
+slog = { version = "2.5.2", features = [
+    "max_level_trace",
+    "release_max_level_trace",
+] }
 dirs = "3.0.1"
-directory = {path = "../common/directory"}
+directory = { path = "../common/directory" }
 futures = "0.3.7"
 environment = { path = "../lighthouse/environment" }
 task_executor = { path = "../common/task_executor" }
diff --git a/beacon_node/beacon_chain/Cargo.toml b/beacon_node/beacon_chain/Cargo.toml
index 7f884f561b..b537327fb3 100644
--- a/beacon_node/beacon_chain/Cargo.toml
+++ b/beacon_node/beacon_chain/Cargo.toml
@@ -27,6 +27,7 @@ operation_pool = { path = "../operation_pool" }
 rayon = "1.4.1"
 serde = "1.0.116"
 serde_derive = "1.0.116"
+ethereum_serde_utils = "0.5.0"
 slog = { version = "2.5.2", features = ["max_level_trace"] }
 sloggers = { version = "2.1.1", features = ["json"] }
 slot_clock = { path = "../../common/slot_clock" }
diff --git a/beacon_node/beacon_chain/src/attestation_rewards.rs b/beacon_node/beacon_chain/src/attestation_rewards.rs
index a4a661197f..94bd28f98f 100644
--- a/beacon_node/beacon_chain/src/attestation_rewards.rs
+++ b/beacon_node/beacon_chain/src/attestation_rewards.rs
@@ -3,7 +3,8 @@ use eth2::lighthouse::attestation_rewards::{IdealAttestationRewards, TotalAttest
 use eth2::lighthouse::StandardAttestationRewards;
 use participation_cache::ParticipationCache;
 use safe_arith::SafeArith;
-use slog::{debug, Logger};
+use serde_utils::quoted_u64::Quoted;
+use slog::debug;
 use state_processing::{
     common::altair::BaseRewardPerIncrement,
     per_epoch_processing::altair::{participation_cache, rewards_and_penalties::get_flag_weight},
@@ -15,32 +16,111 @@ use store::consts::altair::{
 };
 use types::consts::altair::WEIGHT_DENOMINATOR;
 
-use types::{Epoch, EthSpec};
+use types::{BeaconState, Epoch, EthSpec};
 
 use eth2::types::ValidatorId;
+use state_processing::common::base::get_base_reward_from_effective_balance;
+use state_processing::per_epoch_processing::base::rewards_and_penalties::{
+    get_attestation_component_delta, get_attestation_deltas_all, get_attestation_deltas_subset,
+    get_inactivity_penalty_delta, get_inclusion_delay_delta,
+};
+use state_processing::per_epoch_processing::base::validator_statuses::InclusionInfo;
+use state_processing::per_epoch_processing::base::{
+    TotalBalances, ValidatorStatus, ValidatorStatuses,
+};
 
 impl<T: BeaconChainTypes> BeaconChain<T> {
     pub fn compute_attestation_rewards(
         &self,
         epoch: Epoch,
         validators: Vec<ValidatorId>,
-        log: Logger,
     ) -> Result<StandardAttestationRewards, BeaconChainError> {
-        debug!(log, "computing attestation rewards"; "epoch" => epoch, "validator_count" => validators.len());
+        debug!(self.log, "computing attestation rewards"; "epoch" => epoch, "validator_count" => validators.len());
 
         // Get state
-        let spec = &self.spec;
-
         let state_slot = (epoch + 1).end_slot(T::EthSpec::slots_per_epoch());
 
         let state_root = self
             .state_root_at_slot(state_slot)?
             .ok_or(BeaconChainError::NoStateForSlot(state_slot))?;
 
-        let mut state = self
+        let state = self
             .get_state(&state_root, Some(state_slot))?
             .ok_or(BeaconChainError::MissingBeaconState(state_root))?;
 
+        match state {
+            BeaconState::Base(_) => self.compute_attestation_rewards_base(state, validators),
+            BeaconState::Altair(_) | BeaconState::Merge(_) | BeaconState::Capella(_) => {
+                self.compute_attestation_rewards_altair(state, validators)
+            }
+        }
+    }
+
+    fn compute_attestation_rewards_base(
+        &self,
+        mut state: BeaconState<T::EthSpec>,
+        validators: Vec<ValidatorId>,
+    ) -> Result<StandardAttestationRewards, BeaconChainError> {
+        let spec = &self.spec;
+        let mut validator_statuses = ValidatorStatuses::new(&state, spec)?;
+        validator_statuses.process_attestations(&state)?;
+
+        let ideal_rewards =
+            self.compute_ideal_rewards_base(&state, &validator_statuses.total_balances)?;
+
+        let indices_to_attestation_delta = if validators.is_empty() {
+            get_attestation_deltas_all(&state, &validator_statuses, spec)?
+                .into_iter()
+                .enumerate()
+                .collect()
+        } else {
+            let validator_indices = Self::validators_ids_to_indices(&mut state, validators)?;
+            get_attestation_deltas_subset(&state, &validator_statuses, &validator_indices, spec)?
+        };
+
+        let mut total_rewards = vec![];
+
+        for (index, delta) in indices_to_attestation_delta.into_iter() {
+            let head_delta = delta.head_delta;
+            let head = (head_delta.rewards as i64).safe_sub(head_delta.penalties as i64)?;
+
+            let target_delta = delta.target_delta;
+            let target = (target_delta.rewards as i64).safe_sub(target_delta.penalties as i64)?;
+
+            let source_delta = delta.source_delta;
+            let source = (source_delta.rewards as i64).safe_sub(source_delta.penalties as i64)?;
+
+            // No penalties associated with inclusion delay
+            let inclusion_delay = delta.inclusion_delay_delta.rewards;
+            let inactivity = delta.inactivity_penalty_delta.penalties.wrapping_neg() as i64;
+
+            let rewards = TotalAttestationRewards {
+                validator_index: index as u64,
+                head,
+                target,
+                source,
+                inclusion_delay: Some(Quoted {
+                    value: inclusion_delay,
+                }),
+                inactivity,
+            };
+
+            total_rewards.push(rewards);
+        }
+
+        Ok(StandardAttestationRewards {
+            ideal_rewards,
+            total_rewards,
+        })
+    }
+
+    fn compute_attestation_rewards_altair(
+        &self,
+        mut state: BeaconState<T::EthSpec>,
+        validators: Vec<ValidatorId>,
+    ) -> Result<StandardAttestationRewards, BeaconChainError> {
+        let spec = &self.spec;
+
         // Calculate ideal_rewards
         let participation_cache = ParticipationCache::new(&state, spec)?;
 
@@ -71,7 +151,7 @@ impl<T: BeaconChainTypes> BeaconChain<T> {
             let base_reward_per_increment =
                 BaseRewardPerIncrement::new(total_active_balance, spec)?;
 
-            for effective_balance_eth in 0..=32 {
+            for effective_balance_eth in 1..=self.max_effective_balance_increment_steps()? {
                 let effective_balance =
                     effective_balance_eth.safe_mul(spec.effective_balance_increment)?;
                 let base_reward =
@@ -86,7 +166,7 @@ impl<T: BeaconChainTypes> BeaconChain<T> {
                 let ideal_reward = reward_numerator
                     .safe_div(active_increments)?
                     .safe_div(WEIGHT_DENOMINATOR)?;
-                if !state.is_in_inactivity_leak(previous_epoch, spec) {
+                if !state.is_in_inactivity_leak(previous_epoch, spec)? {
                     ideal_rewards_hashmap
                         .insert((flag_index, effective_balance), (ideal_reward, penalty));
                 } else {
@@ -101,20 +181,12 @@ impl<T: BeaconChainTypes> BeaconChain<T> {
         let validators = if validators.is_empty() {
             participation_cache.eligible_validator_indices().to_vec()
         } else {
-            validators
-                .into_iter()
-                .map(|validator| match validator {
-                    ValidatorId::Index(i) => Ok(i as usize),
-                    ValidatorId::PublicKey(pubkey) => state
-                        .get_validator_index(&pubkey)?
-                        .ok_or(BeaconChainError::ValidatorPubkeyUnknown(pubkey)),
-                })
-                .collect::<Result<Vec<_>, _>>()?
+            Self::validators_ids_to_indices(&mut state, validators)?
         };
 
         for validator_index in &validators {
             let eligible = state.is_eligible_validator(previous_epoch, *validator_index)?;
-            let mut head_reward = 0u64;
+            let mut head_reward = 0i64;
             let mut target_reward = 0i64;
             let mut source_reward = 0i64;
 
@@ -132,7 +204,7 @@ impl<T: BeaconChainTypes> BeaconChain<T> {
                         .map_err(|_| BeaconChainError::AttestationRewardsError)?;
                     if voted_correctly {
                         if flag_index == TIMELY_HEAD_FLAG_INDEX {
-                            head_reward += ideal_reward;
+                            head_reward += *ideal_reward as i64;
                         } else if flag_index == TIMELY_TARGET_FLAG_INDEX {
                             target_reward += *ideal_reward as i64;
                         } else if flag_index == TIMELY_SOURCE_FLAG_INDEX {
@@ -152,6 +224,9 @@ impl<T: BeaconChainTypes> BeaconChain<T> {
                 head: head_reward,
                 target: target_reward,
                 source: source_reward,
+                inclusion_delay: None,
+                // TODO: altair calculation logic needs to be updated to include inactivity penalty
+                inactivity: 0,
             });
         }
 
@@ -173,6 +248,9 @@ impl<T: BeaconChainTypes> BeaconChain<T> {
                             head: 0,
                             target: 0,
                             source: 0,
+                            inclusion_delay: None,
+                            // TODO: altair calculation logic needs to be updated to include inactivity penalty
+                            inactivity: 0,
                         });
                     match *flag_index {
                         TIMELY_SOURCE_FLAG_INDEX => entry.source += ideal_reward,
@@ -192,4 +270,126 @@ impl<T: BeaconChainTypes> BeaconChain<T> {
             total_rewards,
         })
     }
+
+    fn max_effective_balance_increment_steps(&self) -> Result<u64, BeaconChainError> {
+        let spec = &self.spec;
+        let max_steps = spec
+            .max_effective_balance
+            .safe_div(spec.effective_balance_increment)?;
+        Ok(max_steps)
+    }
+
+    fn validators_ids_to_indices(
+        state: &mut BeaconState<T::EthSpec>,
+        validators: Vec<ValidatorId>,
+    ) -> Result<Vec<usize>, BeaconChainError> {
+        let indices = validators
+            .into_iter()
+            .map(|validator| match validator {
+                ValidatorId::Index(i) => Ok(i as usize),
+                ValidatorId::PublicKey(pubkey) => state
+                    .get_validator_index(&pubkey)?
+                    .ok_or(BeaconChainError::ValidatorPubkeyUnknown(pubkey)),
+            })
+            .collect::<Result<Vec<_>, _>>()?;
+        Ok(indices)
+    }
+
+    fn compute_ideal_rewards_base(
+        &self,
+        state: &BeaconState<T::EthSpec>,
+        total_balances: &TotalBalances,
+    ) -> Result<Vec<IdealAttestationRewards>, BeaconChainError> {
+        let spec = &self.spec;
+        let previous_epoch = state.previous_epoch();
+        let finality_delay = previous_epoch
+            .safe_sub(state.finalized_checkpoint().epoch)?
+            .as_u64();
+
+        let ideal_validator_status = ValidatorStatus {
+            is_previous_epoch_attester: true,
+            is_slashed: false,
+            inclusion_info: Some(InclusionInfo {
+                delay: 1,
+                ..Default::default()
+            }),
+            ..Default::default()
+        };
+
+        let mut ideal_attestation_rewards_list = Vec::new();
+
+        for effective_balance_step in 1..=self.max_effective_balance_increment_steps()? {
+            let effective_balance =
+                effective_balance_step.safe_mul(spec.effective_balance_increment)?;
+            let base_reward = get_base_reward_from_effective_balance::<T::EthSpec>(
+                effective_balance,
+                total_balances.current_epoch(),
+                spec,
+            )?;
+
+            // compute ideal head rewards
+            let head = get_attestation_component_delta(
+                true,
+                total_balances.previous_epoch_head_attesters(),
+                total_balances,
+                base_reward,
+                finality_delay,
+                spec,
+            )?
+            .rewards;
+
+            // compute ideal target rewards
+            let target = get_attestation_component_delta(
+                true,
+                total_balances.previous_epoch_target_attesters(),
+                total_balances,
+                base_reward,
+                finality_delay,
+                spec,
+            )?
+            .rewards;
+
+            // compute ideal source rewards
+            let source = get_attestation_component_delta(
+                true,
+                total_balances.previous_epoch_attesters(),
+                total_balances,
+                base_reward,
+                finality_delay,
+                spec,
+            )?
+            .rewards;
+
+            // compute ideal inclusion delay rewards
+            let inclusion_delay =
+                get_inclusion_delay_delta(&ideal_validator_status, base_reward, spec)?
+                    .0
+                    .rewards;
+
+            // compute inactivity penalty
+            let inactivity = get_inactivity_penalty_delta(
+                &ideal_validator_status,
+                base_reward,
+                finality_delay,
+                spec,
+            )?
+            .penalties
+            .wrapping_neg() as i64;
+
+            let ideal_attestation_rewards = IdealAttestationRewards {
+                effective_balance,
+                head,
+                target,
+                source,
+                inclusion_delay: Some(Quoted {
+                    value: inclusion_delay,
+                }),
+                inactivity,
+            };
+
+            ideal_attestation_rewards_list.push(ideal_attestation_rewards);
+        }
+
+        Ok(ideal_attestation_rewards_list)
+    }
 }
diff --git a/beacon_node/beacon_chain/src/attestation_verification.rs b/beacon_node/beacon_chain/src/attestation_verification.rs
index 6df0758b2e..5535fec37c 100644
--- a/beacon_node/beacon_chain/src/attestation_verification.rs
+++ b/beacon_node/beacon_chain/src/attestation_verification.rs
@@ -35,10 +35,8 @@
 mod batch;
 
 use crate::{
-    beacon_chain::{MAXIMUM_GOSSIP_CLOCK_DISPARITY, VALIDATOR_PUBKEY_CACHE_LOCK_TIMEOUT},
-    metrics,
-    observed_aggregates::ObserveOutcome,
-    observed_attesters::Error as ObservedAttestersError,
+    beacon_chain::VALIDATOR_PUBKEY_CACHE_LOCK_TIMEOUT, metrics,
+    observed_aggregates::ObserveOutcome, observed_attesters::Error as ObservedAttestersError,
     BeaconChain, BeaconChainError, BeaconChainTypes,
 };
 use bls::verify_signature_sets;
@@ -57,8 +55,8 @@ use std::borrow::Cow;
 use strum::AsRefStr;
 use tree_hash::TreeHash;
 use types::{
-    Attestation, BeaconCommittee, CommitteeIndex, Epoch, EthSpec, Hash256, IndexedAttestation,
-    SelectionProof, SignedAggregateAndProof, Slot, SubnetId,
+    Attestation, BeaconCommittee, ChainSpec, CommitteeIndex, Epoch, EthSpec, Hash256,
+    IndexedAttestation, SelectionProof, SignedAggregateAndProof, Slot, SubnetId,
 };
 
 pub use batch::{batch_verify_aggregated_attestations, batch_verify_unaggregated_attestations};
@@ -454,7 +452,7 @@ impl<'a, T: BeaconChainTypes> IndexedAggregatedAttestation<'a, T> {
         // MAXIMUM_GOSSIP_CLOCK_DISPARITY allowance).
         //
         // We do not queue future attestations for later processing.
-        verify_propagation_slot_range(&chain.slot_clock, attestation)?;
+        verify_propagation_slot_range(&chain.slot_clock, attestation, &chain.spec)?;
 
         // Check the attestation's epoch matches its target.
         if attestation.data.slot.epoch(T::EthSpec::slots_per_epoch())
@@ -722,7 +720,7 @@ impl<'a, T: BeaconChainTypes> IndexedUnaggregatedAttestation<'a, T> {
         // MAXIMUM_GOSSIP_CLOCK_DISPARITY allowance).
         //
         // We do not queue future attestations for later processing.
-        verify_propagation_slot_range(&chain.slot_clock, attestation)?;
+        verify_propagation_slot_range(&chain.slot_clock, attestation, &chain.spec)?;
 
         // Check to ensure that the attestation is "unaggregated". I.e., it has exactly one
         // aggregation bit set.
@@ -1037,11 +1035,11 @@ fn verify_head_block_is_known<T: BeaconChainTypes>(
 pub fn verify_propagation_slot_range<S: SlotClock, E: EthSpec>(
     slot_clock: &S,
     attestation: &Attestation<E>,
+    spec: &ChainSpec,
 ) -> Result<(), Error> {
     let attestation_slot = attestation.data.slot;
-
     let latest_permissible_slot = slot_clock
-        .now_with_future_tolerance(MAXIMUM_GOSSIP_CLOCK_DISPARITY)
+        .now_with_future_tolerance(spec.maximum_gossip_clock_disparity())
         .ok_or(BeaconChainError::UnableToReadSlot)?;
     if attestation_slot > latest_permissible_slot {
         return Err(Error::FutureSlot {
@@ -1052,7 +1050,7 @@ pub fn verify_propagation_slot_range<S: SlotClock, E: EthSpec>(
 
     // Taking advantage of saturating subtraction on `Slot`.
     let earliest_permissible_slot = slot_clock
-        .now_with_past_tolerance(MAXIMUM_GOSSIP_CLOCK_DISPARITY)
+        .now_with_past_tolerance(spec.maximum_gossip_clock_disparity())
         .ok_or(BeaconChainError::UnableToReadSlot)?
         - E::slots_per_epoch();
     if attestation_slot < earliest_permissible_slot {
diff --git a/beacon_node/beacon_chain/src/beacon_chain.rs b/beacon_node/beacon_chain/src/beacon_chain.rs
index 01343ff3b1..d5b86d63ff 100644
--- a/beacon_node/beacon_chain/src/beacon_chain.rs
+++ b/beacon_node/beacon_chain/src/beacon_chain.rs
@@ -164,7 +164,7 @@ pub enum WhenSlotSkipped {
     ///
     /// This is how the HTTP API behaves.
     None,
-    /// If the slot it a skip slot, return the previous non-skipped block.
+    /// If the slot is a skip slot, return the previous non-skipped block.
     ///
     /// This is generally how the specification behaves.
     Prev,
@@ -197,6 +197,17 @@ pub struct PrePayloadAttributes {
     pub parent_block_number: u64,
 }
 
+/// Information about a state/block at a specific slot.
+#[derive(Debug, Clone, Copy)]
+pub struct FinalizationAndCanonicity {
+    /// True if the slot of the state or block is finalized.
+    ///
+    /// This alone DOES NOT imply that the state/block is finalized, use `self.is_finalized()`.
+    pub slot_is_finalized: bool,
+    /// True if the state or block is canonical at its slot.
+    pub canonical: bool,
+}
+
 /// Define whether a forkchoiceUpdate needs to be checked for an override (`Yes`) or has already
 /// been checked (`AlreadyApplied`). It is safe to specify `Yes` even if re-orgs are disabled.
 #[derive(Debug, Default, Clone, Copy, PartialEq, Eq)]
@@ -206,11 +217,6 @@ pub enum OverrideForkchoiceUpdate {
     AlreadyApplied,
 }
 
-/// The accepted clock drift for nodes gossiping blocks and attestations. See:
-///
-/// https://github.com/ethereum/eth2.0-specs/blob/v0.12.1/specs/phase0/p2p-interface.md#configuration
-pub const MAXIMUM_GOSSIP_CLOCK_DISPARITY: Duration = Duration::from_millis(500);
-
 #[derive(Debug, PartialEq)]
 pub enum AttestationProcessingOutcome {
     Processed,
@@ -426,6 +432,12 @@ pub struct BeaconChain<T: BeaconChainTypes> {
 
 type BeaconBlockAndState<T, Payload> = (BeaconBlock<T, Payload>, BeaconState<T>);
 
+impl FinalizationAndCanonicity {
+    pub fn is_finalized(self) -> bool {
+        self.slot_is_finalized && self.canonical
+    }
+}
+
 impl<T: BeaconChainTypes> BeaconChain<T> {
     /// Checks if a block is finalized.
     /// The finalization check is done with the block slot. The block root is used to verify that
@@ -455,16 +467,30 @@ impl<T: BeaconChainTypes> BeaconChain<T> {
         state_root: &Hash256,
         state_slot: Slot,
     ) -> Result<bool, Error> {
+        self.state_finalization_and_canonicity(state_root, state_slot)
+            .map(FinalizationAndCanonicity::is_finalized)
+    }
+
+    /// Fetch the finalization and canonicity status of the state with `state_root`.
+    pub fn state_finalization_and_canonicity(
+        &self,
+        state_root: &Hash256,
+        state_slot: Slot,
+    ) -> Result<FinalizationAndCanonicity, Error> {
         let finalized_slot = self
             .canonical_head
             .cached_head()
             .finalized_checkpoint()
             .epoch
             .start_slot(T::EthSpec::slots_per_epoch());
-        let is_canonical = self
+        let slot_is_finalized = state_slot <= finalized_slot;
+        let canonical = self
             .state_root_at_slot(state_slot)?
             .map_or(false, |canonical_root| state_root == &canonical_root);
-        Ok(state_slot <= finalized_slot && is_canonical)
+        Ok(FinalizationAndCanonicity {
+            slot_is_finalized,
+            canonical,
+        })
     }
 
     /// Persists the head tracker and fork choice.
@@ -4630,6 +4656,7 @@ impl<T: BeaconChainTypes> BeaconChain<T> {
             self.log,
             "Produced block on state";
             "block_size" => block_size,
+            "slot" => block.slot(),
         );
 
         metrics::observe(&metrics::BLOCK_SIZE, block_size as f64);
@@ -5545,14 +5572,16 @@ impl<T: BeaconChainTypes> BeaconChain<T> {
             let (mut state, state_root) = if let Some((state, state_root)) = head_state_opt {
                 (state, state_root)
             } else {
-                let state_root = head_block.state_root;
-                let state = self
+                let block_state_root = head_block.state_root;
+                let max_slot = shuffling_epoch.start_slot(T::EthSpec::slots_per_epoch());
+                let (state_root, state) = self
                     .store
                     .get_inconsistent_state_for_attestation_verification_only(
-                        &state_root,
-                        Some(head_block.slot),
+                        &head_block_root,
+                        max_slot,
+                        block_state_root,
                     )?
-                    .ok_or(Error::MissingBeaconState(head_block.state_root))?;
+                    .ok_or(Error::MissingBeaconState(block_state_root))?;
                 (state, state_root)
             };
 
diff --git a/beacon_node/beacon_chain/src/beacon_fork_choice_store.rs b/beacon_node/beacon_chain/src/beacon_fork_choice_store.rs
index 9b2edbd8b5..2a42b49b42 100644
--- a/beacon_node/beacon_chain/src/beacon_fork_choice_store.rs
+++ b/beacon_node/beacon_chain/src/beacon_fork_choice_store.rs
@@ -321,9 +321,17 @@ where
                 .deconstruct()
                 .0;
 
-            let state = self
+            let max_slot = self
+                .justified_checkpoint
+                .epoch
+                .start_slot(E::slots_per_epoch());
+            let (_, state) = self
                 .store
-                .get_state(&justified_block.state_root(), Some(justified_block.slot()))
+                .get_advanced_hot_state(
+                    self.justified_checkpoint.root,
+                    max_slot,
+                    justified_block.state_root(),
+                )
                 .map_err(Error::FailedToReadState)?
                 .ok_or_else(|| Error::MissingState(justified_block.state_root()))?;
 
diff --git a/beacon_node/beacon_chain/src/beacon_proposer_cache.rs b/beacon_node/beacon_chain/src/beacon_proposer_cache.rs
index e76a5a8058..eae71bd63e 100644
--- a/beacon_node/beacon_chain/src/beacon_proposer_cache.rs
+++ b/beacon_node/beacon_chain/src/beacon_proposer_cache.rs
@@ -135,7 +135,7 @@ impl BeaconProposerCache {
 
 /// Compute the proposer duties using the head state without cache.
 pub fn compute_proposer_duties_from_head<T: BeaconChainTypes>(
-    current_epoch: Epoch,
+    request_epoch: Epoch,
     chain: &BeaconChain<T>,
 ) -> Result<(Vec<usize>, Hash256, ExecutionStatus, Fork), BeaconChainError> {
     // Atomically collect information about the head whilst holding the canonical head `Arc` as
@@ -159,7 +159,7 @@ pub fn compute_proposer_duties_from_head<T: BeaconChainTypes>(
         .ok_or(BeaconChainError::HeadMissingFromForkChoice(head_block_root))?;
 
     // Advance the state into the requested epoch.
-    ensure_state_is_in_epoch(&mut state, head_state_root, current_epoch, &chain.spec)?;
+    ensure_state_is_in_epoch(&mut state, head_state_root, request_epoch, &chain.spec)?;
 
     let indices = state
         .get_beacon_proposer_indices(&chain.spec)
diff --git a/beacon_node/beacon_chain/src/block_verification.rs b/beacon_node/beacon_chain/src/block_verification.rs
index 492f492521..3654484e1f 100644
--- a/beacon_node/beacon_chain/src/block_verification.rs
+++ b/beacon_node/beacon_chain/src/block_verification.rs
@@ -59,7 +59,7 @@ use crate::validator_pubkey_cache::ValidatorPubkeyCache;
 use crate::{
     beacon_chain::{
         BeaconForkChoice, ForkChoiceError, BLOCK_PROCESSING_CACHE_LOCK_TIMEOUT,
-        MAXIMUM_GOSSIP_CLOCK_DISPARITY, VALIDATOR_PUBKEY_CACHE_LOCK_TIMEOUT,
+        VALIDATOR_PUBKEY_CACHE_LOCK_TIMEOUT,
     },
     metrics, BeaconChain, BeaconChainError, BeaconChainTypes,
 };
@@ -730,7 +730,7 @@ impl<T: BeaconChainTypes> GossipVerifiedBlock<T> {
         // Do not gossip or process blocks from future slots.
         let present_slot_with_tolerance = chain
             .slot_clock
-            .now_with_future_tolerance(MAXIMUM_GOSSIP_CLOCK_DISPARITY)
+            .now_with_future_tolerance(chain.spec.maximum_gossip_clock_disparity())
             .ok_or(BeaconChainError::UnableToReadSlot)?;
         if block.slot() > present_slot_with_tolerance {
             return Err(BlockError::FutureSlot {
@@ -1261,7 +1261,7 @@ impl<T: BeaconChainTypes> ExecutionPendingBlock<T> {
 
         // Perform a sanity check on the pre-state.
         let parent_slot = parent.beacon_block.slot();
-        if state.slot() < parent_slot || state.slot() > parent_slot + 1 {
+        if state.slot() < parent_slot || state.slot() > block.slot() {
             return Err(BeaconChainError::BadPreState {
                 parent_root: parent.beacon_block_root,
                 parent_slot,
@@ -1760,13 +1760,18 @@ fn load_parent<T: BeaconChainTypes>(
                 BlockError::from(BeaconChainError::MissingBeaconBlock(block.parent_root()))
             })?;
 
-        // Load the parent blocks state from the database, returning an error if it is not found.
+        // Load the parent block's state from the database, returning an error if it is not found.
         // It is an error because if we know the parent block we should also know the parent state.
-        let parent_state_root = parent_block.state_root();
-        let parent_state = chain
-            .get_state(&parent_state_root, Some(parent_block.slot()))?
+        // Retrieve any state that is advanced through to at most `block.slot()`: this is
+        // particularly important if `block` descends from the finalized/split block, but at a slot
+        // prior to the finalized slot (which is invalid and inaccessible in our DB schema).
+        let (parent_state_root, parent_state) = chain
+            .store
+            .get_advanced_hot_state(root, block.slot(), parent_block.state_root())?
             .ok_or_else(|| {
-                BeaconChainError::DBInconsistent(format!("Missing state {:?}", parent_state_root))
+                BeaconChainError::DBInconsistent(
+                    format!("Missing state for parent block {root:?}",),
+                )
             })?;
 
         metrics::inc_counter(&metrics::BLOCK_PROCESSING_SNAPSHOT_CACHE_MISSES);
diff --git a/beacon_node/beacon_chain/src/builder.rs b/beacon_node/beacon_chain/src/builder.rs
index 044391c415..54739f2b8a 100644
--- a/beacon_node/beacon_chain/src/builder.rs
+++ b/beacon_node/beacon_chain/src/builder.rs
@@ -24,8 +24,9 @@ use operation_pool::{OperationPool, PersistedOperationPool};
 use parking_lot::RwLock;
 use proto_array::{DisallowedReOrgOffsets, ReOrgThreshold};
 use slasher::Slasher;
-use slog::{crit, error, info, Logger};
+use slog::{crit, debug, error, info, Logger};
 use slot_clock::{SlotClock, TestingSlotClock};
+use state_processing::per_slot_processing;
 use std::marker::PhantomData;
 use std::sync::Arc;
 use std::time::Duration;
@@ -287,7 +288,7 @@ where
         let genesis_state = store
             .get_state(&genesis_block.state_root(), Some(genesis_block.slot()))
             .map_err(|e| descriptive_db_error("genesis state", &e))?
-            .ok_or("Genesis block not found in store")?;
+            .ok_or("Genesis state not found in store")?;
 
         self.genesis_time = Some(genesis_state.genesis_time());
 
@@ -382,6 +383,16 @@ where
         let (genesis, updated_builder) = self.set_genesis_state(beacon_state)?;
         self = updated_builder;
 
+        // Stage the database's metadata fields for atomic storage when `build` is called.
+        // Since v4.4.0 we will set the anchor with a dummy state upper limit in order to prevent
+        // historic states from being retained (unless `--reconstruct-historic-states` is set).
+        let retain_historic_states = self.chain_config.reconstruct_historic_states;
+        self.pending_io_batch.push(
+            store
+                .init_anchor_info(genesis.beacon_block.message(), retain_historic_states)
+                .map_err(|e| format!("Failed to initialize genesis anchor: {:?}", e))?,
+        );
+
         let fc_store = BeaconForkChoiceStore::get_forkchoice_store(store, &genesis)
             .map_err(|e| format!("Unable to initialize fork choice store: {e:?}"))?;
         let current_slot = None;
@@ -408,30 +419,28 @@ where
         weak_subj_block: SignedBeaconBlock<TEthSpec>,
         genesis_state: BeaconState<TEthSpec>,
     ) -> Result<Self, String> {
-        let store = self.store.clone().ok_or("genesis_state requires a store")?;
+        let store = self
+            .store
+            .clone()
+            .ok_or("weak_subjectivity_state requires a store")?;
+        let log = self
+            .log
+            .as_ref()
+            .ok_or("weak_subjectivity_state requires a log")?;
 
-        let weak_subj_slot = weak_subj_state.slot();
-        let weak_subj_block_root = weak_subj_block.canonical_root();
-        let weak_subj_state_root = weak_subj_block.state_root();
-
-        // Check that the given block lies on an epoch boundary. Due to the database only storing
-        // full states on epoch boundaries and at restore points it would be difficult to support
-        // starting from a mid-epoch state.
-        if weak_subj_slot % TEthSpec::slots_per_epoch() != 0 {
-            return Err(format!(
-                "Checkpoint block at slot {} is not aligned to epoch start. \
-                 Please supply an aligned checkpoint with block.slot % 32 == 0",
-                weak_subj_block.slot(),
-            ));
-        }
-
-        // Check that the block and state have consistent slots and state roots.
-        if weak_subj_state.slot() != weak_subj_block.slot() {
-            return Err(format!(
-                "Slot of snapshot block ({}) does not match snapshot state ({})",
-                weak_subj_block.slot(),
-                weak_subj_state.slot(),
-            ));
+        // Ensure the state is advanced to an epoch boundary.
+        let slots_per_epoch = TEthSpec::slots_per_epoch();
+        if weak_subj_state.slot() % slots_per_epoch != 0 {
+            debug!(
+                log,
+                "Advancing checkpoint state to boundary";
+                "state_slot" => weak_subj_state.slot(),
+                "block_slot" => weak_subj_block.slot(),
+            );
+            while weak_subj_state.slot() % slots_per_epoch != 0 {
+                per_slot_processing(&mut weak_subj_state, None, &self.spec)
+                    .map_err(|e| format!("Error advancing state: {e:?}"))?;
+            }
         }
 
         // Prime all caches before storing the state in the database and computing the tree hash
@@ -439,15 +448,19 @@ where
         weak_subj_state
             .build_caches(&self.spec)
             .map_err(|e| format!("Error building caches on checkpoint state: {e:?}"))?;
-
-        let computed_state_root = weak_subj_state
+        let weak_subj_state_root = weak_subj_state
             .update_tree_hash_cache()
             .map_err(|e| format!("Error computing checkpoint state root: {:?}", e))?;
 
-        if weak_subj_state_root != computed_state_root {
+        let weak_subj_slot = weak_subj_state.slot();
+        let weak_subj_block_root = weak_subj_block.canonical_root();
+
+        // Validate the state's `latest_block_header` against the checkpoint block.
+        let state_latest_block_root = weak_subj_state.get_latest_block_root(weak_subj_state_root);
+        if weak_subj_block_root != state_latest_block_root {
             return Err(format!(
-                "Snapshot state root does not match block, expected: {:?}, got: {:?}",
-                weak_subj_state_root, computed_state_root
+                "Snapshot state's most recent block root does not match block, expected: {:?}, got: {:?}",
+                weak_subj_block_root, state_latest_block_root
             ));
         }
 
@@ -464,10 +477,25 @@ where
 
         // Set the store's split point *before* storing genesis so that genesis is stored
         // immediately in the freezer DB.
-        store.set_split(weak_subj_slot, weak_subj_state_root);
+        store.set_split(weak_subj_slot, weak_subj_state_root, weak_subj_block_root);
         let (_, updated_builder) = self.set_genesis_state(genesis_state)?;
         self = updated_builder;
 
+        // Fill in the linear block roots between the checkpoint block's slot and the aligned
+        // state's slot. All slots less than the block's slot will be handled by block backfill,
+        // while states greater or equal to the checkpoint state will be handled by `migrate_db`.
+        let block_root_batch = store
+            .store_frozen_block_root_at_skip_slots(
+                weak_subj_block.slot(),
+                weak_subj_state.slot(),
+                weak_subj_block_root,
+            )
+            .map_err(|e| format!("Error writing frozen block roots: {e:?}"))?;
+        store
+            .cold_db
+            .do_atomically(block_root_batch)
+            .map_err(|e| format!("Error writing frozen block roots: {e:?}"))?;
+
         // Write the state and block non-atomically, it doesn't matter if they're forgotten
         // about on a crash restart.
         store
@@ -480,10 +508,11 @@ where
         // Stage the database's metadata fields for atomic storage when `build` is called.
         // This prevents the database from restarting in an inconsistent state if the anchor
         // info or split point is written before the `PersistedBeaconChain`.
+        let retain_historic_states = self.chain_config.reconstruct_historic_states;
         self.pending_io_batch.push(store.store_split_in_batch());
         self.pending_io_batch.push(
             store
-                .init_anchor_info(weak_subj_block.message())
+                .init_anchor_info(weak_subj_block.message(), retain_historic_states)
                 .map_err(|e| format!("Failed to initialize anchor info: {:?}", e))?,
         );
 
@@ -503,13 +532,12 @@ where
         let fc_store = BeaconForkChoiceStore::get_forkchoice_store(store, &snapshot)
             .map_err(|e| format!("Unable to initialize fork choice store: {e:?}"))?;
 
-        let current_slot = Some(snapshot.beacon_block.slot());
         let fork_choice = ForkChoice::from_anchor(
             fc_store,
             snapshot.beacon_block_root,
             &snapshot.beacon_block,
             &snapshot.beacon_state,
-            current_slot,
+            Some(weak_subj_slot),
             &self.spec,
         )
         .map_err(|e| format!("Unable to initialize ForkChoice: {:?}", e))?;
@@ -672,9 +700,8 @@ where
                 Err(e) => return Err(descriptive_db_error("head block", &e)),
             };
 
-        let head_state_root = head_block.state_root();
-        let head_state = store
-            .get_state(&head_state_root, Some(head_block.slot()))
+        let (_head_state_root, head_state) = store
+            .get_advanced_hot_state(head_block_root, current_slot, head_block.state_root())
             .map_err(|e| descriptive_db_error("head state", &e))?
             .ok_or("Head state not found in store")?;
 
diff --git a/beacon_node/beacon_chain/src/canonical_head.rs b/beacon_node/beacon_chain/src/canonical_head.rs
index 2b1f714362..7fa5b01521 100644
--- a/beacon_node/beacon_chain/src/canonical_head.rs
+++ b/beacon_node/beacon_chain/src/canonical_head.rs
@@ -47,7 +47,8 @@ use crate::{
 };
 use eth2::types::{EventKind, SseChainReorg, SseFinalizedCheckpoint, SseHead, SseLateHead};
 use fork_choice::{
-    ExecutionStatus, ForkChoiceView, ForkchoiceUpdateParameters, ProtoBlock, ResetPayloadStatuses,
+    ExecutionStatus, ForkChoiceStore, ForkChoiceView, ForkchoiceUpdateParameters, ProtoBlock,
+    ResetPayloadStatuses,
 };
 use itertools::process_results;
 use parking_lot::{Mutex, RwLock, RwLockReadGuard, RwLockWriteGuard};
@@ -298,10 +299,10 @@ impl<T: BeaconChainTypes> CanonicalHead<T> {
         let beacon_block = store
             .get_full_block(&beacon_block_root)?
             .ok_or(Error::MissingBeaconBlock(beacon_block_root))?;
-        let beacon_state_root = beacon_block.state_root();
-        let beacon_state = store
-            .get_state(&beacon_state_root, Some(beacon_block.slot()))?
-            .ok_or(Error::MissingBeaconState(beacon_state_root))?;
+        let current_slot = fork_choice.fc_store().get_current_slot();
+        let (_, beacon_state) = store
+            .get_advanced_hot_state(beacon_block_root, current_slot, beacon_block.state_root())?
+            .ok_or(Error::MissingBeaconState(beacon_block.state_root()))?;
 
         let snapshot = BeaconSnapshot {
             beacon_block_root,
@@ -669,10 +670,14 @@ impl<T: BeaconChainTypes> BeaconChain<T> {
                         .get_full_block(&new_view.head_block_root)?
                         .ok_or(Error::MissingBeaconBlock(new_view.head_block_root))?;
 
-                    let beacon_state_root = beacon_block.state_root();
-                    let beacon_state: BeaconState<T::EthSpec> = self
-                        .get_state(&beacon_state_root, Some(beacon_block.slot()))?
-                        .ok_or(Error::MissingBeaconState(beacon_state_root))?;
+                    let (_, beacon_state) = self
+                        .store
+                        .get_advanced_hot_state(
+                            new_view.head_block_root,
+                            current_slot,
+                            beacon_block.state_root(),
+                        )?
+                        .ok_or(Error::MissingBeaconState(beacon_block.state_root()))?;
 
                     Ok(BeaconSnapshot {
                         beacon_block: Arc::new(beacon_block),
diff --git a/beacon_node/beacon_chain/src/chain_config.rs b/beacon_node/beacon_chain/src/chain_config.rs
index cc7a957ecc..d1bddcf736 100644
--- a/beacon_node/beacon_chain/src/chain_config.rs
+++ b/beacon_node/beacon_chain/src/chain_config.rs
@@ -79,10 +79,10 @@ pub struct ChainConfig {
     ///
     /// This is useful for block builders and testing.
     pub always_prepare_payload: bool,
-    /// Whether backfill sync processing should be rate-limited.
-    pub enable_backfill_rate_limiting: bool,
     /// Whether to use `ProgressiveBalancesCache` in unrealized FFG progression calculation.
     pub progressive_balances_mode: ProgressiveBalancesMode,
+    /// Number of epochs between each migration of data from the hot database to the freezer.
+    pub epochs_per_migration: u64,
 }
 
 impl Default for ChainConfig {
@@ -112,8 +112,8 @@ impl Default for ChainConfig {
             shuffling_cache_size: crate::shuffling_cache::DEFAULT_CACHE_SIZE,
             genesis_backfill: false,
             always_prepare_payload: false,
-            enable_backfill_rate_limiting: true,
             progressive_balances_mode: ProgressiveBalancesMode::Checked,
+            epochs_per_migration: crate::migrate::DEFAULT_EPOCHS_PER_MIGRATION,
         }
     }
 }
diff --git a/beacon_node/beacon_chain/src/errors.rs b/beacon_node/beacon_chain/src/errors.rs
index 50bcf42653..8714131150 100644
--- a/beacon_node/beacon_chain/src/errors.rs
+++ b/beacon_node/beacon_chain/src/errors.rs
@@ -24,7 +24,7 @@ use state_processing::{
     },
     signature_sets::Error as SignatureSetError,
     state_advance::Error as StateAdvanceError,
-    BlockProcessingError, BlockReplayError, SlotProcessingError,
+    BlockProcessingError, BlockReplayError, EpochProcessingError, SlotProcessingError,
 };
 use std::time::Duration;
 use task_executor::ShutdownReason;
@@ -60,6 +60,7 @@ pub enum BeaconChainError {
     MissingBeaconBlock(Hash256),
     MissingBeaconState(Hash256),
     SlotProcessingError(SlotProcessingError),
+    EpochProcessingError(EpochProcessingError),
     StateAdvanceError(StateAdvanceError),
     UnableToAdvanceState(String),
     NoStateForAttestation {
@@ -217,6 +218,7 @@ pub enum BeaconChainError {
 }
 
 easy_from_to!(SlotProcessingError, BeaconChainError);
+easy_from_to!(EpochProcessingError, BeaconChainError);
 easy_from_to!(AttestationValidationError, BeaconChainError);
 easy_from_to!(SyncCommitteeMessageValidationError, BeaconChainError);
 easy_from_to!(ExitValidationError, BeaconChainError);
diff --git a/beacon_node/beacon_chain/src/events.rs b/beacon_node/beacon_chain/src/events.rs
index fed0503237..b267cc853f 100644
--- a/beacon_node/beacon_chain/src/events.rs
+++ b/beacon_node/beacon_chain/src/events.rs
@@ -21,8 +21,11 @@ pub struct ServerSentEventHandler<T: EthSpec> {
 }
 
 impl<T: EthSpec> ServerSentEventHandler<T> {
-    pub fn new(log: Logger) -> Self {
-        Self::new_with_capacity(log, DEFAULT_CHANNEL_CAPACITY)
+    pub fn new(log: Logger, capacity_multiplier: usize) -> Self {
+        Self::new_with_capacity(
+            log,
+            capacity_multiplier.saturating_mul(DEFAULT_CHANNEL_CAPACITY),
+        )
     }
 
     pub fn new_with_capacity(log: Logger, capacity: usize) -> Self {
diff --git a/beacon_node/beacon_chain/src/lib.rs b/beacon_node/beacon_chain/src/lib.rs
index c5cf74e179..4ea1eeee01 100644
--- a/beacon_node/beacon_chain/src/lib.rs
+++ b/beacon_node/beacon_chain/src/lib.rs
@@ -54,7 +54,7 @@ pub use self::beacon_chain::{
     AttestationProcessingOutcome, BeaconChain, BeaconChainTypes, BeaconStore, ChainSegmentResult,
     ForkChoiceError, OverrideForkchoiceUpdate, ProduceBlockVerification, StateSkipConfig,
     WhenSlotSkipped, INVALID_FINALIZED_MERGE_TRANSITION_BLOCK_SHUTDOWN_REASON,
-    INVALID_JUSTIFIED_PAYLOAD_SHUTDOWN_REASON, MAXIMUM_GOSSIP_CLOCK_DISPARITY,
+    INVALID_JUSTIFIED_PAYLOAD_SHUTDOWN_REASON,
 };
 pub use self::beacon_snapshot::BeaconSnapshot;
 pub use self::chain_config::ChainConfig;
@@ -73,6 +73,7 @@ pub use execution_layer::EngineState;
 pub use execution_payload::NotifyExecutionLayer;
 pub use fork_choice::{ExecutionStatus, ForkchoiceUpdateParameters};
 pub use metrics::scrape_for_metrics;
+pub use migrate::MigratorConfig;
 pub use parking_lot;
 pub use slot_clock;
 pub use state_processing::per_block_processing::errors::{
diff --git a/beacon_node/beacon_chain/src/light_client_finality_update_verification.rs b/beacon_node/beacon_chain/src/light_client_finality_update_verification.rs
index 7c431ebccc..638d2b4012 100644
--- a/beacon_node/beacon_chain/src/light_client_finality_update_verification.rs
+++ b/beacon_node/beacon_chain/src/light_client_finality_update_verification.rs
@@ -1,6 +1,4 @@
-use crate::{
-    beacon_chain::MAXIMUM_GOSSIP_CLOCK_DISPARITY, BeaconChain, BeaconChainError, BeaconChainTypes,
-};
+use crate::{BeaconChain, BeaconChainError, BeaconChainTypes};
 use derivative::Derivative;
 use slot_clock::SlotClock;
 use std::time::Duration;
@@ -103,7 +101,8 @@ impl<T: BeaconChainTypes> VerifiedLightClientFinalityUpdate<T> {
         // verify that enough time has passed for the block to have been propagated
         match start_time {
             Some(time) => {
-                if seen_timestamp + MAXIMUM_GOSSIP_CLOCK_DISPARITY < time + one_third_slot_duration
+                if seen_timestamp + chain.spec.maximum_gossip_clock_disparity()
+                    < time + one_third_slot_duration
                 {
                     return Err(Error::TooEarly);
                 }
diff --git a/beacon_node/beacon_chain/src/light_client_optimistic_update_verification.rs b/beacon_node/beacon_chain/src/light_client_optimistic_update_verification.rs
index 20d7181808..2d1a5cf97c 100644
--- a/beacon_node/beacon_chain/src/light_client_optimistic_update_verification.rs
+++ b/beacon_node/beacon_chain/src/light_client_optimistic_update_verification.rs
@@ -1,6 +1,4 @@
-use crate::{
-    beacon_chain::MAXIMUM_GOSSIP_CLOCK_DISPARITY, BeaconChain, BeaconChainError, BeaconChainTypes,
-};
+use crate::{BeaconChain, BeaconChainError, BeaconChainTypes};
 use derivative::Derivative;
 use eth2::types::Hash256;
 use slot_clock::SlotClock;
@@ -103,7 +101,8 @@ impl<T: BeaconChainTypes> VerifiedLightClientOptimisticUpdate<T> {
         // verify that enough time has passed for the block to have been propagated
         match start_time {
             Some(time) => {
-                if seen_timestamp + MAXIMUM_GOSSIP_CLOCK_DISPARITY < time + one_third_slot_duration
+                if seen_timestamp + chain.spec.maximum_gossip_clock_disparity()
+                    < time + one_third_slot_duration
                 {
                     return Err(Error::TooEarly);
                 }
diff --git a/beacon_node/beacon_chain/src/merge_readiness.rs b/beacon_node/beacon_chain/src/merge_readiness.rs
index c66df39eed..bfc2b36fdb 100644
--- a/beacon_node/beacon_chain/src/merge_readiness.rs
+++ b/beacon_node/beacon_chain/src/merge_readiness.rs
@@ -86,9 +86,6 @@ pub enum MergeReadiness {
         #[serde(serialize_with = "serialize_uint256")]
         current_difficulty: Option<Uint256>,
     },
-    /// The transition configuration with the EL failed, there might be a problem with
-    /// connectivity, authentication or a difference in configuration.
-    ExchangeTransitionConfigurationFailed { error: String },
     /// The EL can be reached and has the correct configuration, however it's not yet synced.
     NotSynced,
     /// The user has not configured this node to use an execution endpoint.
@@ -109,12 +106,6 @@ impl fmt::Display for MergeReadiness {
                     params, current_difficulty
                 )
             }
-            MergeReadiness::ExchangeTransitionConfigurationFailed { error } => write!(
-                f,
-                "Could not confirm the transition configuration with the \
-                    execution endpoint: {:?}",
-                error
-            ),
             MergeReadiness::NotSynced => write!(
                 f,
                 "The execution endpoint is connected and configured, \
@@ -155,14 +146,6 @@ impl<T: BeaconChainTypes> BeaconChain<T> {
     /// Attempts to connect to the EL and confirm that it is ready for the merge.
     pub async fn check_merge_readiness(&self) -> MergeReadiness {
         if let Some(el) = self.execution_layer.as_ref() {
-            if let Err(e) = el.exchange_transition_configuration(&self.spec).await {
-                // The EL was either unreachable, responded with an error or has a different
-                // configuration.
-                return MergeReadiness::ExchangeTransitionConfigurationFailed {
-                    error: format!("{:?}", e),
-                };
-            }
-
             if !el.is_synced_for_notifier().await {
                 // The EL is not synced.
                 return MergeReadiness::NotSynced;
diff --git a/beacon_node/beacon_chain/src/migrate.rs b/beacon_node/beacon_chain/src/migrate.rs
index 66f082742e..6353a64e00 100644
--- a/beacon_node/beacon_chain/src/migrate.rs
+++ b/beacon_node/beacon_chain/src/migrate.rs
@@ -25,10 +25,15 @@ const MIN_COMPACTION_PERIOD_SECONDS: u64 = 7200;
 /// Compact after a large finality gap, if we respect `MIN_COMPACTION_PERIOD_SECONDS`.
 const COMPACTION_FINALITY_DISTANCE: u64 = 1024;
 
+/// Default number of epochs to wait between finalization migrations.
+pub const DEFAULT_EPOCHS_PER_MIGRATION: u64 = 1;
+
 /// The background migrator runs a thread to perform pruning and migrate state from the hot
 /// to the cold database.
 pub struct BackgroundMigrator<E: EthSpec, Hot: ItemStore<E>, Cold: ItemStore<E>> {
     db: Arc<HotColdDB<E, Hot, Cold>>,
+    /// Record of when the last migration ran, for enforcing `epochs_per_migration`.
+    prev_migration: Arc<Mutex<PrevMigration>>,
     #[allow(clippy::type_complexity)]
     tx_thread: Option<Mutex<(mpsc::Sender<Notification>, thread::JoinHandle<()>)>>,
     /// Genesis block root, for persisting the `PersistedBeaconChain`.
@@ -36,9 +41,22 @@ pub struct BackgroundMigrator<E: EthSpec, Hot: ItemStore<E>, Cold: ItemStore<E>>
     log: Logger,
 }
 
-#[derive(Debug, Default, Clone, PartialEq, Eq)]
+#[derive(Debug, Clone, PartialEq, Eq)]
 pub struct MigratorConfig {
     pub blocking: bool,
+    /// Run migrations at most once per `epochs_per_migration`.
+    ///
+    /// If set to 0 or 1, then run every finalization.
+    pub epochs_per_migration: u64,
+}
+
+impl Default for MigratorConfig {
+    fn default() -> Self {
+        Self {
+            blocking: false,
+            epochs_per_migration: DEFAULT_EPOCHS_PER_MIGRATION,
+        }
+    }
 }
 
 impl MigratorConfig {
@@ -46,6 +64,19 @@ impl MigratorConfig {
         self.blocking = true;
         self
     }
+
+    pub fn epochs_per_migration(mut self, epochs_per_migration: u64) -> Self {
+        self.epochs_per_migration = epochs_per_migration;
+        self
+    }
+}
+
+/// Record of when the last migration ran.
+pub struct PrevMigration {
+    /// The epoch at which the last finalization migration ran.
+    epoch: Epoch,
+    /// The number of epochs to wait between runs.
+    epochs_per_migration: u64,
 }
 
 /// Pruning can be successful, or in rare cases deferred to a later point.
@@ -92,6 +123,7 @@ pub struct FinalizationNotification {
     finalized_state_root: BeaconStateHash,
     finalized_checkpoint: Checkpoint,
     head_tracker: Arc<HeadTracker>,
+    prev_migration: Arc<Mutex<PrevMigration>>,
     genesis_block_root: Hash256,
 }
 
@@ -103,6 +135,11 @@ impl<E: EthSpec, Hot: ItemStore<E>, Cold: ItemStore<E>> BackgroundMigrator<E, Ho
         genesis_block_root: Hash256,
         log: Logger,
     ) -> Self {
+        // Estimate last migration run from DB split slot.
+        let prev_migration = Arc::new(Mutex::new(PrevMigration {
+            epoch: db.get_split_slot().epoch(E::slots_per_epoch()),
+            epochs_per_migration: config.epochs_per_migration,
+        }));
         let tx_thread = if config.blocking {
             None
         } else {
@@ -111,6 +148,7 @@ impl<E: EthSpec, Hot: ItemStore<E>, Cold: ItemStore<E>> BackgroundMigrator<E, Ho
         Self {
             db,
             tx_thread,
+            prev_migration,
             genesis_block_root,
             log,
         }
@@ -131,6 +169,7 @@ impl<E: EthSpec, Hot: ItemStore<E>, Cold: ItemStore<E>> BackgroundMigrator<E, Ho
             finalized_state_root,
             finalized_checkpoint,
             head_tracker,
+            prev_migration: self.prev_migration.clone(),
             genesis_block_root: self.genesis_block_root,
         };
 
@@ -204,9 +243,30 @@ impl<E: EthSpec, Hot: ItemStore<E>, Cold: ItemStore<E>> BackgroundMigrator<E, Ho
         notif: FinalizationNotification,
         log: &Logger,
     ) {
+        // Do not run too frequently.
+        let epoch = notif.finalized_checkpoint.epoch;
+        let mut prev_migration = notif.prev_migration.lock();
+        if epoch < prev_migration.epoch + prev_migration.epochs_per_migration {
+            debug!(
+                log,
+                "Database consolidation deferred";
+                "last_finalized_epoch" => prev_migration.epoch,
+                "new_finalized_epoch" => epoch,
+                "epochs_per_migration" => prev_migration.epochs_per_migration,
+            );
+            return;
+        }
+
+        // Update the previous migration epoch immediately to avoid holding the lock. If the
+        // migration doesn't succeed then the next migration will be retried at the next scheduled
+        // run.
+        prev_migration.epoch = epoch;
+        drop(prev_migration);
+
         debug!(log, "Database consolidation started");
 
         let finalized_state_root = notif.finalized_state_root;
+        let finalized_block_root = notif.finalized_checkpoint.root;
 
         let finalized_state = match db.get_state(&finalized_state_root.into(), None) {
             Ok(Some(state)) => state,
@@ -260,7 +320,12 @@ impl<E: EthSpec, Hot: ItemStore<E>, Cold: ItemStore<E>> BackgroundMigrator<E, Ho
             }
         };
 
-        match migrate_database(db.clone(), finalized_state_root.into(), &finalized_state) {
+        match migrate_database(
+            db.clone(),
+            finalized_state_root.into(),
+            finalized_block_root,
+            &finalized_state,
+        ) {
             Ok(()) => {}
             Err(Error::HotColdDBError(HotColdDBError::FreezeSlotUnaligned(slot))) => {
                 debug!(
diff --git a/beacon_node/beacon_chain/src/observed_attesters.rs b/beacon_node/beacon_chain/src/observed_attesters.rs
index 59c67bd1b9..605a134321 100644
--- a/beacon_node/beacon_chain/src/observed_attesters.rs
+++ b/beacon_node/beacon_chain/src/observed_attesters.rs
@@ -841,7 +841,7 @@ mod tests {
                     let mut store = $type::default();
                     let max_cap = store.max_capacity();
 
-                    let to_skip = vec![1_u64, 3, 4, 5];
+                    let to_skip = [1_u64, 3, 4, 5];
                     let periods = (0..max_cap * 3)
                         .into_iter()
                         .filter(|i| !to_skip.contains(i))
@@ -1012,7 +1012,7 @@ mod tests {
                     let mut store = $type::default();
                     let max_cap = store.max_capacity();
 
-                    let to_skip = vec![1_u64, 3, 4, 5];
+                    let to_skip = [1_u64, 3, 4, 5];
                     let periods = (0..max_cap * 3)
                         .into_iter()
                         .filter(|i| !to_skip.contains(i))
@@ -1121,7 +1121,7 @@ mod tests {
                     let mut store = $type::default();
                     let max_cap = store.max_capacity();
 
-                    let to_skip = vec![1_u64, 3, 4, 5];
+                    let to_skip = [1_u64, 3, 4, 5];
                     let periods = (0..max_cap * 3)
                         .into_iter()
                         .filter(|i| !to_skip.contains(i))
diff --git a/beacon_node/beacon_chain/src/sync_committee_verification.rs b/beacon_node/beacon_chain/src/sync_committee_verification.rs
index 246bb12cc0..5c6710bfd6 100644
--- a/beacon_node/beacon_chain/src/sync_committee_verification.rs
+++ b/beacon_node/beacon_chain/src/sync_committee_verification.rs
@@ -28,10 +28,8 @@
 
 use crate::observed_attesters::SlotSubcommitteeIndex;
 use crate::{
-    beacon_chain::{MAXIMUM_GOSSIP_CLOCK_DISPARITY, VALIDATOR_PUBKEY_CACHE_LOCK_TIMEOUT},
-    metrics,
-    observed_aggregates::ObserveOutcome,
-    BeaconChain, BeaconChainError, BeaconChainTypes,
+    beacon_chain::VALIDATOR_PUBKEY_CACHE_LOCK_TIMEOUT, metrics,
+    observed_aggregates::ObserveOutcome, BeaconChain, BeaconChainError, BeaconChainTypes,
 };
 use bls::{verify_signature_sets, PublicKeyBytes};
 use derivative::Derivative;
@@ -52,6 +50,7 @@ use tree_hash_derive::TreeHash;
 use types::consts::altair::SYNC_COMMITTEE_SUBNET_COUNT;
 use types::slot_data::SlotData;
 use types::sync_committee::Error as SyncCommitteeError;
+use types::ChainSpec;
 use types::{
     sync_committee_contribution::Error as ContributionError, AggregateSignature, BeaconStateError,
     EthSpec, Hash256, SignedContributionAndProof, Slot, SyncCommitteeContribution,
@@ -297,7 +296,7 @@ impl<T: BeaconChainTypes> VerifiedSyncContribution<T> {
         let subcommittee_index = contribution.subcommittee_index as usize;
 
         // Ensure sync committee contribution is within the MAXIMUM_GOSSIP_CLOCK_DISPARITY allowance.
-        verify_propagation_slot_range(&chain.slot_clock, contribution)?;
+        verify_propagation_slot_range(&chain.slot_clock, contribution, &chain.spec)?;
 
         // Validate subcommittee index.
         if contribution.subcommittee_index >= SYNC_COMMITTEE_SUBNET_COUNT {
@@ -460,7 +459,7 @@ impl VerifiedSyncCommitteeMessage {
         // MAXIMUM_GOSSIP_CLOCK_DISPARITY allowance).
         //
         // We do not queue future sync committee messages for later processing.
-        verify_propagation_slot_range(&chain.slot_clock, &sync_message)?;
+        verify_propagation_slot_range(&chain.slot_clock, &sync_message, &chain.spec)?;
 
         // Ensure the `subnet_id` is valid for the given validator.
         let pubkey = chain
@@ -576,11 +575,11 @@ impl VerifiedSyncCommitteeMessage {
 pub fn verify_propagation_slot_range<S: SlotClock, U: SlotData>(
     slot_clock: &S,
     sync_contribution: &U,
+    spec: &ChainSpec,
 ) -> Result<(), Error> {
     let message_slot = sync_contribution.get_slot();
-
     let latest_permissible_slot = slot_clock
-        .now_with_future_tolerance(MAXIMUM_GOSSIP_CLOCK_DISPARITY)
+        .now_with_future_tolerance(spec.maximum_gossip_clock_disparity())
         .ok_or(BeaconChainError::UnableToReadSlot)?;
     if message_slot > latest_permissible_slot {
         return Err(Error::FutureSlot {
@@ -590,7 +589,7 @@ pub fn verify_propagation_slot_range<S: SlotClock, U: SlotData>(
     }
 
     let earliest_permissible_slot = slot_clock
-        .now_with_past_tolerance(MAXIMUM_GOSSIP_CLOCK_DISPARITY)
+        .now_with_past_tolerance(spec.maximum_gossip_clock_disparity())
         .ok_or(BeaconChainError::UnableToReadSlot)?;
 
     if message_slot < earliest_permissible_slot {
diff --git a/beacon_node/beacon_chain/src/test_utils.rs b/beacon_node/beacon_chain/src/test_utils.rs
index 6520c9ba9c..5fc05c5551 100644
--- a/beacon_node/beacon_chain/src/test_utils.rs
+++ b/beacon_node/beacon_chain/src/test_utils.rs
@@ -516,18 +516,23 @@ where
         let validator_keypairs = self
             .validator_keypairs
             .expect("cannot build without validator keypairs");
+        let chain_config = self.chain_config.unwrap_or_default();
 
         let mut builder = BeaconChainBuilder::new(self.eth_spec_instance)
             .logger(log.clone())
             .custom_spec(spec)
             .store(self.store.expect("cannot build without store"))
-            .store_migrator_config(MigratorConfig::default().blocking())
+            .store_migrator_config(
+                MigratorConfig::default()
+                    .blocking()
+                    .epochs_per_migration(chain_config.epochs_per_migration),
+            )
             .task_executor(self.runtime.task_executor.clone())
             .execution_layer(self.execution_layer)
             .dummy_eth1_backend()
             .expect("should build dummy backend")
             .shutdown_sender(shutdown_tx)
-            .chain_config(self.chain_config.unwrap_or_default())
+            .chain_config(chain_config)
             .event_handler(Some(ServerSentEventHandler::new_with_capacity(
                 log.clone(),
                 5,
diff --git a/beacon_node/beacon_chain/src/timeout_rw_lock.rs b/beacon_node/beacon_chain/src/timeout_rw_lock.rs
index 28e3f4c29c..b2eea76265 100644
--- a/beacon_node/beacon_chain/src/timeout_rw_lock.rs
+++ b/beacon_node/beacon_chain/src/timeout_rw_lock.rs
@@ -5,7 +5,7 @@ use std::time::Duration;
 /// A simple wrapper around `parking_lot::RwLock` that only permits read/write access with a
 /// time-out (i.e., no indefinitely-blocking operations).
 ///
-/// Timeouts can be optionally be disabled at runtime for all instances of this type by calling
+/// Timeouts can be optionally disabled at runtime for all instances of this type by calling
 /// `TimeoutRwLock::disable_timeouts()`.
 pub struct TimeoutRwLock<T>(RwLock<T>);
 
diff --git a/beacon_node/beacon_chain/tests/attestation_verification.rs b/beacon_node/beacon_chain/tests/attestation_verification.rs
index 5cea51090b..7878fd14aa 100644
--- a/beacon_node/beacon_chain/tests/attestation_verification.rs
+++ b/beacon_node/beacon_chain/tests/attestation_verification.rs
@@ -9,7 +9,7 @@ use beacon_chain::{
     test_utils::{
         test_spec, AttestationStrategy, BeaconChainHarness, BlockStrategy, EphemeralHarnessType,
     },
-    BeaconChain, BeaconChainError, BeaconChainTypes, WhenSlotSkipped,
+    BeaconChain, BeaconChainError, BeaconChainTypes, ChainConfig, WhenSlotSkipped,
 };
 use genesis::{interop_genesis_state, DEFAULT_ETH1_BLOCK_HASH};
 use int_to_bytes::int_to_bytes32;
@@ -47,6 +47,10 @@ fn get_harness(validator_count: usize) -> BeaconChainHarness<EphemeralHarnessTyp
 
     let harness = BeaconChainHarness::builder(MainnetEthSpec)
         .spec(spec)
+        .chain_config(ChainConfig {
+            reconstruct_historic_states: true,
+            ..ChainConfig::default()
+        })
         .keypairs(KEYPAIRS[0..validator_count].to_vec())
         .fresh_ephemeral_store()
         .mock_execution_layer()
@@ -79,6 +83,10 @@ fn get_harness_capella_spec(
 
     let harness = BeaconChainHarness::builder(MainnetEthSpec)
         .spec(spec.clone())
+        .chain_config(ChainConfig {
+            reconstruct_historic_states: true,
+            ..ChainConfig::default()
+        })
         .keypairs(validator_keypairs)
         .withdrawal_keypairs(
             KEYPAIRS[0..validator_count]
diff --git a/beacon_node/beacon_chain/tests/block_verification.rs b/beacon_node/beacon_chain/tests/block_verification.rs
index 75b00b2b44..0b87ad1487 100644
--- a/beacon_node/beacon_chain/tests/block_verification.rs
+++ b/beacon_node/beacon_chain/tests/block_verification.rs
@@ -4,7 +4,8 @@ use beacon_chain::test_utils::{
     AttestationStrategy, BeaconChainHarness, BlockStrategy, EphemeralHarnessType,
 };
 use beacon_chain::{
-    BeaconSnapshot, BlockError, ChainSegmentResult, IntoExecutionPendingBlock, NotifyExecutionLayer,
+    BeaconSnapshot, BlockError, ChainConfig, ChainSegmentResult, IntoExecutionPendingBlock,
+    NotifyExecutionLayer,
 };
 use lazy_static::lazy_static;
 use logging::test_logger;
@@ -69,6 +70,10 @@ async fn get_chain_segment() -> Vec<BeaconSnapshot<E>> {
 fn get_harness(validator_count: usize) -> BeaconChainHarness<EphemeralHarnessType<E>> {
     let harness = BeaconChainHarness::builder(MainnetEthSpec)
         .default_spec()
+        .chain_config(ChainConfig {
+            reconstruct_historic_states: true,
+            ..ChainConfig::default()
+        })
         .keypairs(KEYPAIRS[0..validator_count].to_vec())
         .fresh_ephemeral_store()
         .mock_execution_layer()
diff --git a/beacon_node/beacon_chain/tests/payload_invalidation.rs b/beacon_node/beacon_chain/tests/payload_invalidation.rs
index 9a8c324d09..cd4351297b 100644
--- a/beacon_node/beacon_chain/tests/payload_invalidation.rs
+++ b/beacon_node/beacon_chain/tests/payload_invalidation.rs
@@ -7,7 +7,7 @@ use beacon_chain::otb_verification_service::{
 use beacon_chain::{
     canonical_head::{CachedHead, CanonicalHead},
     test_utils::{BeaconChainHarness, EphemeralHarnessType},
-    BeaconChainError, BlockError, ExecutionPayloadError, NotifyExecutionLayer,
+    BeaconChainError, BlockError, ChainConfig, ExecutionPayloadError, NotifyExecutionLayer,
     OverrideForkchoiceUpdate, StateSkipConfig, WhenSlotSkipped,
     INVALID_FINALIZED_MERGE_TRANSITION_BLOCK_SHUTDOWN_REASON,
     INVALID_JUSTIFIED_PAYLOAD_SHUTDOWN_REASON,
@@ -59,6 +59,10 @@ impl InvalidPayloadRig {
 
         let harness = BeaconChainHarness::builder(MainnetEthSpec)
             .spec(spec)
+            .chain_config(ChainConfig {
+                reconstruct_historic_states: true,
+                ..ChainConfig::default()
+            })
             .logger(test_logger())
             .deterministic_keypairs(VALIDATOR_COUNT)
             .mock_execution_layer()
diff --git a/beacon_node/beacon_chain/tests/rewards.rs b/beacon_node/beacon_chain/tests/rewards.rs
index b61bea1242..be271804b9 100644
--- a/beacon_node/beacon_chain/tests/rewards.rs
+++ b/beacon_node/beacon_chain/tests/rewards.rs
@@ -9,19 +9,22 @@ use beacon_chain::{
     test_utils::{AttestationStrategy, BlockStrategy, RelativeSyncCommittee},
     types::{Epoch, EthSpec, Keypair, MinimalEthSpec},
 };
+use eth2::lighthouse::attestation_rewards::TotalAttestationRewards;
+use eth2::lighthouse::StandardAttestationRewards;
+use eth2::types::ValidatorId;
 use lazy_static::lazy_static;
+use types::beacon_state::Error as BeaconStateError;
+use types::{BeaconState, ChainSpec};
 
 pub const VALIDATOR_COUNT: usize = 64;
 
+type E = MinimalEthSpec;
+
 lazy_static! {
     static ref KEYPAIRS: Vec<Keypair> = generate_deterministic_keypairs(VALIDATOR_COUNT);
 }
 
-fn get_harness<E: EthSpec>() -> BeaconChainHarness<EphemeralHarnessType<E>> {
-    let mut spec = E::default_spec();
-
-    spec.altair_fork_epoch = Some(Epoch::new(0)); // We use altair for all tests
-
+fn get_harness(spec: ChainSpec) -> BeaconChainHarness<EphemeralHarnessType<E>> {
     let harness = BeaconChainHarness::builder(E::default())
         .spec(spec)
         .keypairs(KEYPAIRS.to_vec())
@@ -35,8 +38,11 @@ fn get_harness<E: EthSpec>() -> BeaconChainHarness<EphemeralHarnessType<E>> {
 
 #[tokio::test]
 async fn test_sync_committee_rewards() {
-    let num_block_produced = MinimalEthSpec::slots_per_epoch();
-    let harness = get_harness::<MinimalEthSpec>();
+    let mut spec = E::default_spec();
+    spec.altair_fork_epoch = Some(Epoch::new(0));
+
+    let harness = get_harness(spec);
+    let num_block_produced = E::slots_per_epoch();
 
     let latest_block_root = harness
         .extend_chain(
@@ -119,3 +125,175 @@ async fn test_sync_committee_rewards() {
         mismatches.join(",")
     );
 }
+
+#[tokio::test]
+async fn test_verify_attestation_rewards_base() {
+    let harness = get_harness(E::default_spec());
+
+    // epoch 0 (N), only two thirds of validators vote.
+    let two_thirds = (VALIDATOR_COUNT / 3) * 2;
+    let two_thirds_validators: Vec<usize> = (0..two_thirds).collect();
+    harness
+        .extend_chain(
+            E::slots_per_epoch() as usize,
+            BlockStrategy::OnCanonicalHead,
+            AttestationStrategy::SomeValidators(two_thirds_validators),
+        )
+        .await;
+
+    let initial_balances: Vec<u64> = harness.get_current_state().balances().clone().into();
+
+    // extend slots to beginning of epoch N + 2
+    harness.extend_slots(E::slots_per_epoch() as usize).await;
+
+    // compute reward deltas for all validators in epoch N
+    let StandardAttestationRewards {
+        ideal_rewards,
+        total_rewards,
+    } = harness
+        .chain
+        .compute_attestation_rewards(Epoch::new(0), vec![])
+        .unwrap();
+
+    // assert no inactivity penalty for both ideal rewards and individual validators
+    assert!(ideal_rewards.iter().all(|reward| reward.inactivity == 0));
+    assert!(total_rewards.iter().all(|reward| reward.inactivity == 0));
+
+    // apply attestation rewards to initial balances
+    let expected_balances = apply_attestation_rewards(&initial_balances, total_rewards);
+
+    // verify expected balances against actual balances
+    let balances: Vec<u64> = harness.get_current_state().balances().clone().into();
+    assert_eq!(expected_balances, balances);
+}
+
+#[tokio::test]
+async fn test_verify_attestation_rewards_base_inactivity_leak() {
+    let spec = E::default_spec();
+    let harness = get_harness(spec.clone());
+
+    let half = VALIDATOR_COUNT / 2;
+    let half_validators: Vec<usize> = (0..half).collect();
+    // target epoch is the epoch where the chain enters inactivity leak
+    let target_epoch = &spec.min_epochs_to_inactivity_penalty + 1;
+
+    // advance until beginning of epoch N + 1 and get balances
+    harness
+        .extend_chain(
+            (E::slots_per_epoch() * (target_epoch + 1)) as usize,
+            BlockStrategy::OnCanonicalHead,
+            AttestationStrategy::SomeValidators(half_validators.clone()),
+        )
+        .await;
+    let initial_balances: Vec<u64> = harness.get_current_state().balances().clone().into();
+
+    // extend slots to beginning of epoch N + 2
+    harness.advance_slot();
+    harness
+        .extend_chain(
+            E::slots_per_epoch() as usize,
+            BlockStrategy::OnCanonicalHead,
+            AttestationStrategy::SomeValidators(half_validators),
+        )
+        .await;
+    let _slot = harness.get_current_slot();
+
+    // compute reward deltas for all validators in epoch N
+    let StandardAttestationRewards {
+        ideal_rewards,
+        total_rewards,
+    } = harness
+        .chain
+        .compute_attestation_rewards(Epoch::new(target_epoch), vec![])
+        .unwrap();
+
+    // assert inactivity penalty for both ideal rewards and individual validators
+    assert!(ideal_rewards.iter().all(|reward| reward.inactivity < 0));
+    assert!(total_rewards.iter().all(|reward| reward.inactivity < 0));
+
+    // apply attestation rewards to initial balances
+    let expected_balances = apply_attestation_rewards(&initial_balances, total_rewards);
+
+    // verify expected balances against actual balances
+    let balances: Vec<u64> = harness.get_current_state().balances().clone().into();
+    assert_eq!(expected_balances, balances);
+}
+
+#[tokio::test]
+async fn test_verify_attestation_rewards_base_subset_only() {
+    let harness = get_harness(E::default_spec());
+
+    // epoch 0 (N), only two thirds of validators vote.
+    let two_thirds = (VALIDATOR_COUNT / 3) * 2;
+    let two_thirds_validators: Vec<usize> = (0..two_thirds).collect();
+    harness
+        .extend_chain(
+            E::slots_per_epoch() as usize,
+            BlockStrategy::OnCanonicalHead,
+            AttestationStrategy::SomeValidators(two_thirds_validators),
+        )
+        .await;
+
+    // a small subset of validators to compute attestation rewards for
+    let validators_subset = [0, VALIDATOR_COUNT / 2, VALIDATOR_COUNT - 1];
+
+    // capture balances before transitioning to N + 2
+    let initial_balances = get_validator_balances(harness.get_current_state(), &validators_subset);
+
+    // extend slots to beginning of epoch N + 2
+    harness.extend_slots(E::slots_per_epoch() as usize).await;
+
+    let validators_subset_ids: Vec<ValidatorId> = validators_subset
+        .into_iter()
+        .map(|idx| ValidatorId::Index(idx as u64))
+        .collect();
+
+    // compute reward deltas for the subset of validators in epoch N
+    let StandardAttestationRewards {
+        ideal_rewards: _,
+        total_rewards,
+    } = harness
+        .chain
+        .compute_attestation_rewards(Epoch::new(0), validators_subset_ids)
+        .unwrap();
+
+    // apply attestation rewards to initial balances
+    let expected_balances = apply_attestation_rewards(&initial_balances, total_rewards);
+
+    // verify expected balances against actual balances
+    let balances = get_validator_balances(harness.get_current_state(), &validators_subset);
+    assert_eq!(expected_balances, balances);
+}
+
+/// Apply a vec of `TotalAttestationRewards` to initial balances, and return
+fn apply_attestation_rewards(
+    initial_balances: &[u64],
+    attestation_rewards: Vec<TotalAttestationRewards>,
+) -> Vec<u64> {
+    initial_balances
+        .iter()
+        .zip(attestation_rewards)
+        .map(|(&initial_balance, rewards)| {
+            let expected_balance = initial_balance as i64
+                + rewards.head
+                + rewards.source
+                + rewards.target
+                + rewards.inclusion_delay.map(|q| q.value).unwrap_or(0) as i64
+                + rewards.inactivity;
+            expected_balance as u64
+        })
+        .collect::<Vec<u64>>()
+}
+
+fn get_validator_balances(state: BeaconState<E>, validators: &[usize]) -> Vec<u64> {
+    validators
+        .iter()
+        .flat_map(|&id| {
+            state
+                .balances()
+                .get(id)
+                .cloned()
+                .ok_or(BeaconStateError::BalancesOutOfBounds(id))
+        })
+        .collect()
+}
diff --git a/beacon_node/beacon_chain/tests/store_tests.rs b/beacon_node/beacon_chain/tests/store_tests.rs
index 2902774825..ab54af42c7 100644
--- a/beacon_node/beacon_chain/tests/store_tests.rs
+++ b/beacon_node/beacon_chain/tests/store_tests.rs
@@ -9,14 +9,15 @@ use beacon_chain::test_utils::{
 use beacon_chain::validator_monitor::DEFAULT_INDIVIDUAL_TRACKING_THRESHOLD;
 use beacon_chain::{
     historical_blocks::HistoricalBlockError, migrate::MigratorConfig, BeaconChain,
-    BeaconChainError, BeaconChainTypes, BeaconSnapshot, ChainConfig, NotifyExecutionLayer,
-    ServerSentEventHandler, WhenSlotSkipped,
+    BeaconChainError, BeaconChainTypes, BeaconSnapshot, BlockError, ChainConfig,
+    NotifyExecutionLayer, ServerSentEventHandler, WhenSlotSkipped,
 };
 use lazy_static::lazy_static;
 use logging::test_logger;
 use maplit::hashset;
 use rand::Rng;
-use state_processing::BlockReplayer;
+use slot_clock::{SlotClock, TestingSlotClock};
+use state_processing::{state_advance::complete_state_advance, BlockReplayer};
 use std::collections::HashMap;
 use std::collections::HashSet;
 use std::convert::TryInto;
@@ -65,6 +66,19 @@ fn get_store_with_spec(
 fn get_harness(
     store: Arc<HotColdDB<E, LevelDB<E>, LevelDB<E>>>,
     validator_count: usize,
+) -> TestHarness {
+    // Most tests expect to retain historic states, so we use this as the default.
+    let chain_config = ChainConfig {
+        reconstruct_historic_states: true,
+        ..ChainConfig::default()
+    };
+    get_harness_generic(store, validator_count, chain_config)
+}
+
+fn get_harness_generic(
+    store: Arc<HotColdDB<E, LevelDB<E>, LevelDB<E>>>,
+    validator_count: usize,
+    chain_config: ChainConfig,
 ) -> TestHarness {
     let harness = BeaconChainHarness::builder(MinimalEthSpec)
         .default_spec()
@@ -72,6 +86,7 @@ fn get_harness(
         .logger(store.logger().clone())
         .fresh_disk_store(store)
         .mock_execution_layer()
+        .chain_config(chain_config)
         .build();
     harness.advance_slot();
     harness
@@ -406,7 +421,7 @@ async fn forwards_iter_block_and_state_roots_until() {
 
     // The last restore point slot is the point at which the hybrid forwards iterator behaviour
     // changes.
-    let last_restore_point_slot = store.get_latest_restore_point_slot();
+    let last_restore_point_slot = store.get_latest_restore_point_slot().unwrap();
     assert!(last_restore_point_slot > 0);
 
     let chain = &harness.chain;
@@ -460,13 +475,15 @@ async fn block_replay_with_inaccurate_state_roots() {
         .await;
 
     // Slot must not be 0 mod 32 or else no blocks will be replayed.
-    let (mut head_state, head_root) = harness.get_current_state_and_root();
+    let (mut head_state, head_state_root) = harness.get_current_state_and_root();
+    let head_block_root = harness.head_block_root();
     assert_ne!(head_state.slot() % 32, 0);
 
-    let mut fast_head_state = store
+    let (_, mut fast_head_state) = store
         .get_inconsistent_state_for_attestation_verification_only(
-            &head_root,
-            Some(head_state.slot()),
+            &head_block_root,
+            head_state.slot(),
+            head_state_root,
         )
         .unwrap()
         .unwrap();
@@ -565,14 +582,7 @@ async fn block_replayer_hooks() {
 async fn delete_blocks_and_states() {
     let db_path = tempdir().unwrap();
     let store = get_store(&db_path);
-    let validators_keypairs =
-        types::test_utils::generate_deterministic_keypairs(LOW_VALIDATOR_COUNT);
-    let harness = BeaconChainHarness::builder(MinimalEthSpec)
-        .default_spec()
-        .keypairs(validators_keypairs)
-        .fresh_disk_store(store.clone())
-        .mock_execution_layer()
-        .build();
+    let harness = get_harness(store.clone(), LOW_VALIDATOR_COUNT);
 
     let unforked_blocks: u64 = 4 * E::slots_per_epoch();
 
@@ -1015,18 +1025,14 @@ fn check_shuffling_compatible(
 // Ensure blocks from abandoned forks are pruned from the Hot DB
 #[tokio::test]
 async fn prunes_abandoned_fork_between_two_finalized_checkpoints() {
-    const HONEST_VALIDATOR_COUNT: usize = 32 + 0;
-    const ADVERSARIAL_VALIDATOR_COUNT: usize = 16 - 0;
+    const HONEST_VALIDATOR_COUNT: usize = 32;
+    const ADVERSARIAL_VALIDATOR_COUNT: usize = 16;
     const VALIDATOR_COUNT: usize = HONEST_VALIDATOR_COUNT + ADVERSARIAL_VALIDATOR_COUNT;
-    let validators_keypairs = types::test_utils::generate_deterministic_keypairs(VALIDATOR_COUNT);
     let honest_validators: Vec<usize> = (0..HONEST_VALIDATOR_COUNT).collect();
     let adversarial_validators: Vec<usize> = (HONEST_VALIDATOR_COUNT..VALIDATOR_COUNT).collect();
-    let rig = BeaconChainHarness::builder(MinimalEthSpec)
-        .default_spec()
-        .keypairs(validators_keypairs)
-        .fresh_ephemeral_store()
-        .mock_execution_layer()
-        .build();
+    let db_path = tempdir().unwrap();
+    let store = get_store(&db_path);
+    let rig = get_harness(store.clone(), VALIDATOR_COUNT);
     let slots_per_epoch = rig.slots_per_epoch();
     let (mut state, state_root) = rig.get_current_state_and_root();
 
@@ -1125,18 +1131,14 @@ async fn prunes_abandoned_fork_between_two_finalized_checkpoints() {
 
 #[tokio::test]
 async fn pruning_does_not_touch_abandoned_block_shared_with_canonical_chain() {
-    const HONEST_VALIDATOR_COUNT: usize = 32 + 0;
-    const ADVERSARIAL_VALIDATOR_COUNT: usize = 16 - 0;
+    const HONEST_VALIDATOR_COUNT: usize = 32;
+    const ADVERSARIAL_VALIDATOR_COUNT: usize = 16;
     const VALIDATOR_COUNT: usize = HONEST_VALIDATOR_COUNT + ADVERSARIAL_VALIDATOR_COUNT;
-    let validators_keypairs = types::test_utils::generate_deterministic_keypairs(VALIDATOR_COUNT);
     let honest_validators: Vec<usize> = (0..HONEST_VALIDATOR_COUNT).collect();
     let adversarial_validators: Vec<usize> = (HONEST_VALIDATOR_COUNT..VALIDATOR_COUNT).collect();
-    let rig = BeaconChainHarness::builder(MinimalEthSpec)
-        .default_spec()
-        .keypairs(validators_keypairs)
-        .fresh_ephemeral_store()
-        .mock_execution_layer()
-        .build();
+    let db_path = tempdir().unwrap();
+    let store = get_store(&db_path);
+    let rig = get_harness(store.clone(), VALIDATOR_COUNT);
     let slots_per_epoch = rig.slots_per_epoch();
     let (state, state_root) = rig.get_current_state_and_root();
 
@@ -1260,15 +1262,11 @@ async fn pruning_does_not_touch_blocks_prior_to_finalization() {
     const HONEST_VALIDATOR_COUNT: usize = 32;
     const ADVERSARIAL_VALIDATOR_COUNT: usize = 16;
     const VALIDATOR_COUNT: usize = HONEST_VALIDATOR_COUNT + ADVERSARIAL_VALIDATOR_COUNT;
-    let validators_keypairs = types::test_utils::generate_deterministic_keypairs(VALIDATOR_COUNT);
     let honest_validators: Vec<usize> = (0..HONEST_VALIDATOR_COUNT).collect();
     let adversarial_validators: Vec<usize> = (HONEST_VALIDATOR_COUNT..VALIDATOR_COUNT).collect();
-    let rig = BeaconChainHarness::builder(MinimalEthSpec)
-        .default_spec()
-        .keypairs(validators_keypairs)
-        .fresh_ephemeral_store()
-        .mock_execution_layer()
-        .build();
+    let db_path = tempdir().unwrap();
+    let store = get_store(&db_path);
+    let rig = get_harness(store.clone(), VALIDATOR_COUNT);
     let slots_per_epoch = rig.slots_per_epoch();
     let (mut state, state_root) = rig.get_current_state_and_root();
 
@@ -1352,18 +1350,14 @@ async fn pruning_does_not_touch_blocks_prior_to_finalization() {
 
 #[tokio::test]
 async fn prunes_fork_growing_past_youngest_finalized_checkpoint() {
-    const HONEST_VALIDATOR_COUNT: usize = 32 + 0;
-    const ADVERSARIAL_VALIDATOR_COUNT: usize = 16 - 0;
+    const HONEST_VALIDATOR_COUNT: usize = 32;
+    const ADVERSARIAL_VALIDATOR_COUNT: usize = 16;
     const VALIDATOR_COUNT: usize = HONEST_VALIDATOR_COUNT + ADVERSARIAL_VALIDATOR_COUNT;
-    let validators_keypairs = types::test_utils::generate_deterministic_keypairs(VALIDATOR_COUNT);
     let honest_validators: Vec<usize> = (0..HONEST_VALIDATOR_COUNT).collect();
     let adversarial_validators: Vec<usize> = (HONEST_VALIDATOR_COUNT..VALIDATOR_COUNT).collect();
-    let rig = BeaconChainHarness::builder(MinimalEthSpec)
-        .default_spec()
-        .keypairs(validators_keypairs)
-        .fresh_ephemeral_store()
-        .mock_execution_layer()
-        .build();
+    let db_path = tempdir().unwrap();
+    let store = get_store(&db_path);
+    let rig = get_harness(store.clone(), VALIDATOR_COUNT);
     let (state, state_root) = rig.get_current_state_and_root();
 
     // Fill up 0th epoch with canonical chain blocks
@@ -1497,18 +1491,14 @@ async fn prunes_fork_growing_past_youngest_finalized_checkpoint() {
 // This is to check if state outside of normal block processing are pruned correctly.
 #[tokio::test]
 async fn prunes_skipped_slots_states() {
-    const HONEST_VALIDATOR_COUNT: usize = 32 + 0;
-    const ADVERSARIAL_VALIDATOR_COUNT: usize = 16 - 0;
+    const HONEST_VALIDATOR_COUNT: usize = 32;
+    const ADVERSARIAL_VALIDATOR_COUNT: usize = 16;
     const VALIDATOR_COUNT: usize = HONEST_VALIDATOR_COUNT + ADVERSARIAL_VALIDATOR_COUNT;
-    let validators_keypairs = types::test_utils::generate_deterministic_keypairs(VALIDATOR_COUNT);
     let honest_validators: Vec<usize> = (0..HONEST_VALIDATOR_COUNT).collect();
     let adversarial_validators: Vec<usize> = (HONEST_VALIDATOR_COUNT..VALIDATOR_COUNT).collect();
-    let rig = BeaconChainHarness::builder(MinimalEthSpec)
-        .default_spec()
-        .keypairs(validators_keypairs)
-        .fresh_ephemeral_store()
-        .mock_execution_layer()
-        .build();
+    let db_path = tempdir().unwrap();
+    let store = get_store(&db_path);
+    let rig = get_harness(store.clone(), VALIDATOR_COUNT);
     let (state, state_root) = rig.get_current_state_and_root();
 
     let canonical_slots_zeroth_epoch: Vec<Slot> =
@@ -1626,18 +1616,14 @@ async fn prunes_skipped_slots_states() {
 // This is to check if state outside of normal block processing are pruned correctly.
 #[tokio::test]
 async fn finalizes_non_epoch_start_slot() {
-    const HONEST_VALIDATOR_COUNT: usize = 32 + 0;
-    const ADVERSARIAL_VALIDATOR_COUNT: usize = 16 - 0;
+    const HONEST_VALIDATOR_COUNT: usize = 32;
+    const ADVERSARIAL_VALIDATOR_COUNT: usize = 16;
     const VALIDATOR_COUNT: usize = HONEST_VALIDATOR_COUNT + ADVERSARIAL_VALIDATOR_COUNT;
-    let validators_keypairs = types::test_utils::generate_deterministic_keypairs(VALIDATOR_COUNT);
     let honest_validators: Vec<usize> = (0..HONEST_VALIDATOR_COUNT).collect();
     let adversarial_validators: Vec<usize> = (HONEST_VALIDATOR_COUNT..VALIDATOR_COUNT).collect();
-    let rig = BeaconChainHarness::builder(MinimalEthSpec)
-        .default_spec()
-        .keypairs(validators_keypairs)
-        .fresh_ephemeral_store()
-        .mock_execution_layer()
-        .build();
+    let db_path = tempdir().unwrap();
+    let store = get_store(&db_path);
+    let rig = get_harness(store.clone(), VALIDATOR_COUNT);
     let (state, state_root) = rig.get_current_state_and_root();
 
     let canonical_slots_zeroth_epoch: Vec<Slot> =
@@ -2053,39 +2039,82 @@ async fn garbage_collect_temp_states_from_failed_block() {
 }
 
 #[tokio::test]
-async fn weak_subjectivity_sync() {
+async fn weak_subjectivity_sync_easy() {
+    let num_initial_slots = E::slots_per_epoch() * 11;
+    let checkpoint_slot = Slot::new(E::slots_per_epoch() * 9);
+    let slots = (1..num_initial_slots).map(Slot::new).collect();
+    weak_subjectivity_sync_test(slots, checkpoint_slot).await
+}
+
+#[tokio::test]
+async fn weak_subjectivity_sync_unaligned_advanced_checkpoint() {
+    let num_initial_slots = E::slots_per_epoch() * 11;
+    let checkpoint_slot = Slot::new(E::slots_per_epoch() * 9);
+    let slots = (1..num_initial_slots)
+        .map(Slot::new)
+        .filter(|&slot| {
+            // Skip 3 slots leading up to the checkpoint slot.
+            slot <= checkpoint_slot - 3 || slot > checkpoint_slot
+        })
+        .collect();
+    weak_subjectivity_sync_test(slots, checkpoint_slot).await
+}
+
+#[tokio::test]
+async fn weak_subjectivity_sync_unaligned_unadvanced_checkpoint() {
+    let num_initial_slots = E::slots_per_epoch() * 11;
+    let checkpoint_slot = Slot::new(E::slots_per_epoch() * 9 - 3);
+    let slots = (1..num_initial_slots)
+        .map(Slot::new)
+        .filter(|&slot| {
+            // Skip 3 slots after the checkpoint slot.
+            slot <= checkpoint_slot || slot > checkpoint_slot + 3
+        })
+        .collect();
+    weak_subjectivity_sync_test(slots, checkpoint_slot).await
+}
+
+async fn weak_subjectivity_sync_test(slots: Vec<Slot>, checkpoint_slot: Slot) {
     // Build an initial chain on one harness, representing a synced node with full history.
-    let num_initial_blocks = E::slots_per_epoch() * 11;
     let num_final_blocks = E::slots_per_epoch() * 2;
 
     let temp1 = tempdir().unwrap();
     let full_store = get_store(&temp1);
     let harness = get_harness(full_store.clone(), LOW_VALIDATOR_COUNT);
 
+    let all_validators = (0..LOW_VALIDATOR_COUNT).collect::<Vec<_>>();
+
+    let (genesis_state, genesis_state_root) = harness.get_current_state_and_root();
     harness
-        .extend_chain(
-            num_initial_blocks as usize,
-            BlockStrategy::OnCanonicalHead,
-            AttestationStrategy::AllValidators,
+        .add_attested_blocks_at_slots(
+            genesis_state.clone(),
+            genesis_state_root,
+            &slots,
+            &all_validators,
         )
         .await;
 
-    let genesis_state = full_store
-        .get_state(&harness.chain.genesis_state_root, Some(Slot::new(0)))
+    let wss_block_root = harness
+        .chain
+        .block_root_at_slot(checkpoint_slot, WhenSlotSkipped::Prev)
         .unwrap()
         .unwrap();
-    let wss_checkpoint = harness.finalized_checkpoint();
+    let wss_state_root = harness
+        .chain
+        .state_root_at_slot(checkpoint_slot)
+        .unwrap()
+        .unwrap();
+
     let wss_block = harness
         .chain
         .store
-        .get_full_block(&wss_checkpoint.root)
+        .get_full_block(&wss_block_root)
         .unwrap()
         .unwrap();
     let wss_state = full_store
-        .get_state(&wss_block.state_root(), None)
+        .get_state(&wss_state_root, Some(checkpoint_slot))
         .unwrap()
         .unwrap();
-    let wss_slot = wss_block.slot();
 
     // Add more blocks that advance finalization further.
     harness.advance_slot();
@@ -2104,20 +2133,26 @@ async fn weak_subjectivity_sync() {
     let spec = test_spec::<E>();
     let seconds_per_slot = spec.seconds_per_slot;
 
-    // Initialise a new beacon chain from the finalized checkpoint
+    // Initialise a new beacon chain from the finalized checkpoint.
+    // The slot clock must be set to a time ahead of the checkpoint state.
+    let slot_clock = TestingSlotClock::new(
+        Slot::new(0),
+        Duration::from_secs(harness.chain.genesis_time),
+        Duration::from_secs(seconds_per_slot),
+    );
+    slot_clock.set_slot(harness.get_current_slot().as_u64());
     let beacon_chain = Arc::new(
         BeaconChainBuilder::new(MinimalEthSpec)
             .store(store.clone())
             .custom_spec(test_spec::<E>())
             .task_executor(harness.chain.task_executor.clone())
+            .logger(log.clone())
             .weak_subjectivity_state(wss_state, wss_block.clone(), genesis_state)
             .unwrap()
-            .logger(log.clone())
             .store_migrator_config(MigratorConfig::default().blocking())
             .dummy_eth1_backend()
             .expect("should build dummy backend")
-            .testing_slot_clock(Duration::from_secs(seconds_per_slot))
-            .expect("should configure testing slot clock")
+            .slot_clock(slot_clock)
             .shutdown_sender(shutdown_tx)
             .chain_config(ChainConfig::default())
             .event_handler(Some(ServerSentEventHandler::new_with_capacity(
@@ -2131,9 +2166,9 @@ async fn weak_subjectivity_sync() {
 
     // Apply blocks forward to reach head.
     let chain_dump = harness.chain.chain_dump().unwrap();
-    let new_blocks = &chain_dump[wss_slot.as_usize() + 1..];
-
-    assert_eq!(new_blocks[0].beacon_block.slot(), wss_slot + 1);
+    let new_blocks = chain_dump
+        .iter()
+        .filter(|snapshot| snapshot.beacon_block.slot() > checkpoint_slot);
 
     for snapshot in new_blocks {
         let full_block = harness
@@ -2219,13 +2254,17 @@ async fn weak_subjectivity_sync() {
     assert_eq!(forwards, expected);
 
     // All blocks can be loaded.
+    let mut prev_block_root = Hash256::zero();
     for (block_root, slot) in beacon_chain
         .forwards_iter_block_roots(Slot::new(0))
         .unwrap()
         .map(Result::unwrap)
     {
         let block = store.get_blinded_block(&block_root).unwrap().unwrap();
-        assert_eq!(block.slot(), slot);
+        if block_root != prev_block_root {
+            assert_eq!(block.slot(), slot);
+        }
+        prev_block_root = block_root;
     }
 
     // All states from the oldest state slot can be loaded.
@@ -2240,14 +2279,141 @@ async fn weak_subjectivity_sync() {
         assert_eq!(state.canonical_root(), state_root);
     }
 
-    // Anchor slot is still set to the starting slot.
-    assert_eq!(store.get_anchor_slot(), Some(wss_slot));
+    // Anchor slot is still set to the slot of the checkpoint block.
+    assert_eq!(store.get_anchor_slot(), Some(wss_block.slot()));
 
     // Reconstruct states.
     store.clone().reconstruct_historic_states().unwrap();
     assert_eq!(store.get_anchor_slot(), None);
 }
 
+/// Test that blocks and attestations that refer to states around an unaligned split state are
+/// processed correctly.
+#[tokio::test]
+async fn process_blocks_and_attestations_for_unaligned_checkpoint() {
+    let temp = tempdir().unwrap();
+    let store = get_store(&temp);
+    let chain_config = ChainConfig {
+        reconstruct_historic_states: false,
+        ..ChainConfig::default()
+    };
+    let harness = get_harness_generic(store.clone(), LOW_VALIDATOR_COUNT, chain_config);
+
+    let all_validators = (0..LOW_VALIDATOR_COUNT).collect::<Vec<_>>();
+
+    let split_slot = Slot::new(E::slots_per_epoch() * 4);
+    let pre_skips = 1;
+    let post_skips = 1;
+
+    // Build the chain up to the intended split slot, with 3 skips before the split.
+    let slots = (1..=split_slot.as_u64() - pre_skips)
+        .map(Slot::new)
+        .collect::<Vec<_>>();
+
+    let (genesis_state, genesis_state_root) = harness.get_current_state_and_root();
+    harness
+        .add_attested_blocks_at_slots(
+            genesis_state.clone(),
+            genesis_state_root,
+            &slots,
+            &all_validators,
+        )
+        .await;
+
+    // Before the split slot becomes finalized, create two forking blocks that build on the split
+    // block:
+    //
+    // - one that is invalid because it conflicts with finalization (slot <= finalized_slot)
+    // - one that is valid because its slot is not finalized (slot > finalized_slot)
+    let (unadvanced_split_state, unadvanced_split_state_root) =
+        harness.get_current_state_and_root();
+
+    let (invalid_fork_block, _) = harness
+        .make_block(unadvanced_split_state.clone(), split_slot)
+        .await;
+    let (valid_fork_block, _) = harness
+        .make_block(unadvanced_split_state.clone(), split_slot + 1)
+        .await;
+
+    // Advance the chain so that the intended split slot is finalized.
+    // Do not attest in the epoch boundary slot, to make attestation production later easier (no
+    // equivocations).
+    let finalizing_slot = split_slot + 2 * E::slots_per_epoch();
+    for _ in 0..pre_skips + post_skips {
+        harness.advance_slot();
+    }
+    harness.extend_to_slot(finalizing_slot - 1).await;
+    harness
+        .add_block_at_slot(finalizing_slot, harness.get_current_state())
+        .await
+        .unwrap();
+
+    // Check that the split slot is as intended.
+    let split = store.get_split_info();
+    assert_eq!(split.slot, split_slot);
+    assert_eq!(split.block_root, valid_fork_block.parent_root());
+    assert_ne!(split.state_root, unadvanced_split_state_root);
+
+    // Applying the invalid block should fail.
+    let err = harness
+        .chain
+        .process_block(
+            invalid_fork_block.canonical_root(),
+            Arc::new(invalid_fork_block.clone()),
+            NotifyExecutionLayer::Yes,
+            || Ok(()),
+        )
+        .await
+        .unwrap_err();
+    assert!(matches!(err, BlockError::WouldRevertFinalizedSlot { .. }));
+
+    // Applying the valid block should succeed, but it should not become head.
+    harness
+        .chain
+        .process_block(
+            valid_fork_block.canonical_root(),
+            Arc::new(valid_fork_block.clone()),
+            NotifyExecutionLayer::Yes,
+            || Ok(()),
+        )
+        .await
+        .unwrap();
+    harness.chain.recompute_head_at_current_slot().await;
+    assert_ne!(harness.head_block_root(), valid_fork_block.canonical_root());
+
+    // Attestations to the split block in the next 2 epochs should be processed successfully.
+    let attestation_start_slot = harness.get_current_slot();
+    let attestation_end_slot = attestation_start_slot + 2 * E::slots_per_epoch();
+    let (split_state_root, mut advanced_split_state) = harness
+        .chain
+        .store
+        .get_advanced_hot_state(split.block_root, split.slot, split.state_root)
+        .unwrap()
+        .unwrap();
+    complete_state_advance(
+        &mut advanced_split_state,
+        Some(split_state_root),
+        attestation_start_slot,
+        &harness.chain.spec,
+    )
+    .unwrap();
+    advanced_split_state
+        .build_caches(&harness.chain.spec)
+        .unwrap();
+    let advanced_split_state_root = advanced_split_state.update_tree_hash_cache().unwrap();
+    for slot in (attestation_start_slot.as_u64()..attestation_end_slot.as_u64()).map(Slot::new) {
+        let attestations = harness.make_attestations(
+            &all_validators,
+            &advanced_split_state,
+            advanced_split_state_root,
+            split.block_root.into(),
+            slot,
+        );
+        harness.advance_slot();
+        harness.process_attestations(attestations);
+    }
+}
+
 #[tokio::test]
 async fn finalizes_after_resuming_from_db() {
     let validator_count = 16;
@@ -2306,6 +2472,7 @@ async fn finalizes_after_resuming_from_db() {
         .default_spec()
         .keypairs(KEYPAIRS[0..validator_count].to_vec())
         .resumed_disk_store(store)
+        .testing_slot_clock(original_chain.slot_clock.clone())
         .mock_execution_layer()
         .build();
 
@@ -2559,6 +2726,9 @@ async fn schema_downgrade_to_min_version() {
         SchemaVersion(11)
     };
 
+    // Save the slot clock so that the new harness doesn't revert in time.
+    let slot_clock = harness.chain.slot_clock.clone();
+
     // Close the database to ensure everything is written to disk.
     drop(store);
     drop(harness);
@@ -2589,11 +2759,21 @@ async fn schema_downgrade_to_min_version() {
     )
     .expect("schema upgrade from minimum version should work");
 
-    // Rescreate the harness.
+    // Recreate the harness.
+    /*
+    let slot_clock = TestingSlotClock::new(
+        Slot::new(0),
+        Duration::from_secs(harness.chain.genesis_time),
+        Duration::from_secs(spec.seconds_per_slot),
+    );
+    slot_clock.set_slot(harness.get_current_slot().as_u64());
+    */
+
     let harness = BeaconChainHarness::builder(MinimalEthSpec)
         .default_spec()
         .keypairs(KEYPAIRS[0..LOW_VALIDATOR_COUNT].to_vec())
         .logger(store.logger().clone())
+        .testing_slot_clock(slot_clock)
         .resumed_disk_store(store.clone())
         .mock_execution_layer()
         .build();
diff --git a/beacon_node/beacon_chain/tests/tests.rs b/beacon_node/beacon_chain/tests/tests.rs
index c5b2892cbd..8935c69926 100644
--- a/beacon_node/beacon_chain/tests/tests.rs
+++ b/beacon_node/beacon_chain/tests/tests.rs
@@ -6,7 +6,7 @@ use beacon_chain::{
         AttestationStrategy, BeaconChainHarness, BlockStrategy, EphemeralHarnessType,
         OP_POOL_DB_KEY,
     },
-    BeaconChain, NotifyExecutionLayer, StateSkipConfig, WhenSlotSkipped,
+    BeaconChain, ChainConfig, NotifyExecutionLayer, StateSkipConfig, WhenSlotSkipped,
 };
 use lazy_static::lazy_static;
 use operation_pool::PersistedOperationPool;
@@ -28,6 +28,10 @@ lazy_static! {
 fn get_harness(validator_count: usize) -> BeaconChainHarness<EphemeralHarnessType<MinimalEthSpec>> {
     let harness = BeaconChainHarness::builder(MinimalEthSpec)
         .default_spec()
+        .chain_config(ChainConfig {
+            reconstruct_historic_states: true,
+            ..ChainConfig::default()
+        })
         .keypairs(KEYPAIRS[0..validator_count].to_vec())
         .fresh_ephemeral_store()
         .mock_execution_layer()
diff --git a/beacon_node/beacon_processor/Cargo.toml b/beacon_node/beacon_processor/Cargo.toml
new file mode 100644
index 0000000000..c626441bb7
--- /dev/null
+++ b/beacon_node/beacon_processor/Cargo.toml
@@ -0,0 +1,26 @@
+[package]
+name = "beacon_processor"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+slog = { version = "2.5.2", features = ["max_level_trace"] }
+itertools = "0.10.0"
+logging = { path = "../../common/logging" }
+tokio = { version = "1.14.0", features = ["full"] }
+tokio-util = { version = "0.6.3", features = ["time"] }
+futures = "0.3.7"
+fnv = "1.0.7"
+strum = "0.24.0"
+task_executor = { path = "../../common/task_executor" }
+slot_clock = { path = "../../common/slot_clock" }
+lighthouse_network =  { path = "../lighthouse_network" }
+hex = "0.4.2"
+derivative = "2.2.0"
+types = { path = "../../consensus/types" }
+ethereum_ssz = "0.5.0"
+lazy_static = "1.4.0"
+lighthouse_metrics = { path = "../../common/lighthouse_metrics" }
+parking_lot = "0.12.0"
+num_cpus = "1.13.0"
+serde = { version = "1.0.116", features = ["derive"] }
\ No newline at end of file
diff --git a/beacon_node/network/src/beacon_processor/mod.rs b/beacon_node/beacon_processor/src/lib.rs
similarity index 57%
rename from beacon_node/network/src/beacon_processor/mod.rs
rename to beacon_node/beacon_processor/src/lib.rs
index 84d8e1b07a..4c1da85fa5 100644
--- a/beacon_node/network/src/beacon_processor/mod.rs
+++ b/beacon_node/beacon_processor/src/lib.rs
@@ -38,56 +38,40 @@
 //! checks the queues to see if there are more parcels of work that can be spawned in a new worker
 //! task.
 
-use crate::sync::manager::BlockProcessType;
-use crate::{metrics, service::NetworkMessage, sync::SyncMessage};
-use beacon_chain::parking_lot::Mutex;
-use beacon_chain::{BeaconChain, BeaconChainTypes, GossipVerifiedBlock, NotifyExecutionLayer};
-use derivative::Derivative;
+use crate::work_reprocessing_queue::{
+    spawn_reprocess_scheduler, QueuedAggregate, QueuedBackfillBatch, QueuedGossipBlock,
+    QueuedLightClientUpdate, QueuedRpcBlock, QueuedUnaggregate, ReadyWork, ReprocessQueueMessage,
+};
 use futures::stream::{Stream, StreamExt};
 use futures::task::Poll;
-use lighthouse_network::rpc::LightClientBootstrapRequest;
-use lighthouse_network::{
-    rpc::{BlocksByRangeRequest, BlocksByRootRequest, StatusMessage},
-    Client, MessageId, NetworkGlobals, PeerId, PeerRequestId,
-};
+use lighthouse_network::NetworkGlobals;
+use lighthouse_network::{MessageId, PeerId};
 use logging::TimeLatch;
+use parking_lot::Mutex;
+use serde::{Deserialize, Serialize};
 use slog::{crit, debug, error, trace, warn, Logger};
-use std::collections::VecDeque;
+use slot_clock::SlotClock;
+use std::cmp;
+use std::collections::{HashSet, VecDeque};
+use std::fmt;
 use std::future::Future;
-use std::path::PathBuf;
 use std::pin::Pin;
-use std::sync::{Arc, Weak};
+use std::sync::Arc;
 use std::task::Context;
 use std::time::Duration;
-use std::{cmp, collections::HashSet};
 use task_executor::TaskExecutor;
 use tokio::sync::mpsc;
 use tokio::sync::mpsc::error::TrySendError;
-use types::{
-    Attestation, AttesterSlashing, Hash256, LightClientFinalityUpdate, LightClientOptimisticUpdate,
-    ProposerSlashing, SignedAggregateAndProof, SignedBeaconBlock, SignedBlsToExecutionChange,
-    SignedContributionAndProof, SignedVoluntaryExit, SubnetId, SyncCommitteeMessage, SyncSubnetId,
-};
-use work_reprocessing_queue::{
-    spawn_reprocess_scheduler, QueuedAggregate, QueuedLightClientUpdate, QueuedRpcBlock,
-    QueuedUnaggregate, ReadyWork,
-};
+use types::{Attestation, EthSpec, Hash256, SignedAggregateAndProof, Slot, SubnetId};
+use work_reprocessing_queue::IgnoredRpcBlock;
 
-use worker::{Toolbox, Worker};
-
-mod tests;
-mod work_reprocessing_queue;
-mod worker;
-
-use crate::beacon_processor::work_reprocessing_queue::{
-    QueuedBackfillBatch, QueuedGossipBlock, ReprocessQueueMessage,
-};
-pub use worker::{ChainSegmentProcessId, GossipAggregatePackage, GossipAttestationPackage};
+mod metrics;
+pub mod work_reprocessing_queue;
 
 /// The maximum size of the channel for work events to the `BeaconProcessor`.
 ///
 /// Setting this too low will cause consensus messages to be dropped.
-pub const MAX_WORK_EVENT_QUEUE_LEN: usize = 16_384;
+const DEFAULT_MAX_WORK_EVENT_QUEUE_LEN: usize = 16_384;
 
 /// The maximum size of the channel for idle events to the `BeaconProcessor`.
 ///
@@ -96,7 +80,7 @@ pub const MAX_WORK_EVENT_QUEUE_LEN: usize = 16_384;
 const MAX_IDLE_QUEUE_LEN: usize = 16_384;
 
 /// The maximum size of the channel for re-processing work events.
-const MAX_SCHEDULED_WORK_QUEUE_LEN: usize = 3 * MAX_WORK_EVENT_QUEUE_LEN / 4;
+const DEFAULT_MAX_SCHEDULED_WORK_QUEUE_LEN: usize = 3 * DEFAULT_MAX_WORK_EVENT_QUEUE_LEN / 4;
 
 /// The maximum number of queued `Attestation` objects that will be stored before we start dropping
 /// them.
@@ -184,6 +168,14 @@ const MAX_BLS_TO_EXECUTION_CHANGE_QUEUE_LEN: usize = 16_384;
 /// will be stored before we start dropping them.
 const MAX_LIGHT_CLIENT_BOOTSTRAP_QUEUE_LEN: usize = 1_024;
 
+/// The maximum number of priority-0 (highest priority) messages that will be queued before
+/// they begin to be dropped.
+const MAX_API_REQUEST_P0_QUEUE_LEN: usize = 1_024;
+
+/// The maximum number of priority-1 (second-highest priority) messages that will be queued before
+/// they begin to be dropped.
+const MAX_API_REQUEST_P1_QUEUE_LEN: usize = 1_024;
+
 /// The name of the manager tokio task.
 const MANAGER_TASK_NAME: &str = "beacon_processor_manager";
 
@@ -201,8 +193,8 @@ const WORKER_TASK_NAME: &str = "beacon_processor_worker";
 /// Poisoning occurs when an invalid signature is included in a batch of attestations. A single
 /// invalid signature causes the entire batch to fail. When a batch fails, we fall-back to
 /// individually verifying each attestation signature.
-const MAX_GOSSIP_ATTESTATION_BATCH_SIZE: usize = 64;
-const MAX_GOSSIP_AGGREGATE_BATCH_SIZE: usize = 64;
+const DEFAULT_MAX_GOSSIP_ATTESTATION_BATCH_SIZE: usize = 64;
+const DEFAULT_MAX_GOSSIP_AGGREGATE_BATCH_SIZE: usize = 64;
 
 /// Unique IDs used for metrics and testing.
 pub const WORKER_FREED: &str = "worker_freed";
@@ -221,6 +213,7 @@ pub const GOSSIP_SYNC_CONTRIBUTION: &str = "gossip_sync_contribution";
 pub const GOSSIP_LIGHT_CLIENT_FINALITY_UPDATE: &str = "light_client_finality_update";
 pub const GOSSIP_LIGHT_CLIENT_OPTIMISTIC_UPDATE: &str = "light_client_optimistic_update";
 pub const RPC_BLOCK: &str = "rpc_block";
+pub const IGNORED_RPC_BLOCK: &str = "ignored_rpc_block";
 pub const CHAIN_SEGMENT: &str = "chain_segment";
 pub const CHAIN_SEGMENT_BACKFILL: &str = "chain_segment_backfill";
 pub const STATUS_PROCESSING: &str = "status_processing";
@@ -231,6 +224,61 @@ pub const UNKNOWN_BLOCK_ATTESTATION: &str = "unknown_block_attestation";
 pub const UNKNOWN_BLOCK_AGGREGATE: &str = "unknown_block_aggregate";
 pub const UNKNOWN_LIGHT_CLIENT_UPDATE: &str = "unknown_light_client_update";
 pub const GOSSIP_BLS_TO_EXECUTION_CHANGE: &str = "gossip_bls_to_execution_change";
+pub const API_REQUEST_P0: &str = "api_request_p0";
+pub const API_REQUEST_P1: &str = "api_request_p1";
+
+#[derive(Clone, PartialEq, Debug, Serialize, Deserialize)]
+pub struct BeaconProcessorConfig {
+    pub max_workers: usize,
+    pub max_work_event_queue_len: usize,
+    pub max_scheduled_work_queue_len: usize,
+    pub max_gossip_attestation_batch_size: usize,
+    pub max_gossip_aggregate_batch_size: usize,
+    pub enable_backfill_rate_limiting: bool,
+}
+
+impl Default for BeaconProcessorConfig {
+    fn default() -> Self {
+        Self {
+            max_workers: cmp::max(1, num_cpus::get()),
+            max_work_event_queue_len: DEFAULT_MAX_WORK_EVENT_QUEUE_LEN,
+            max_scheduled_work_queue_len: DEFAULT_MAX_SCHEDULED_WORK_QUEUE_LEN,
+            max_gossip_attestation_batch_size: DEFAULT_MAX_GOSSIP_ATTESTATION_BATCH_SIZE,
+            max_gossip_aggregate_batch_size: DEFAULT_MAX_GOSSIP_AGGREGATE_BATCH_SIZE,
+            enable_backfill_rate_limiting: true,
+        }
+    }
+}
+
+// The channels necessary to instantiate a `BeaconProcessor`.
+pub struct BeaconProcessorChannels<E: EthSpec> {
+    pub beacon_processor_tx: BeaconProcessorSend<E>,
+    pub beacon_processor_rx: mpsc::Receiver<WorkEvent<E>>,
+    pub work_reprocessing_tx: mpsc::Sender<ReprocessQueueMessage>,
+    pub work_reprocessing_rx: mpsc::Receiver<ReprocessQueueMessage>,
+}
+
+impl<E: EthSpec> BeaconProcessorChannels<E> {
+    pub fn new(config: &BeaconProcessorConfig) -> Self {
+        let (beacon_processor_tx, beacon_processor_rx) =
+            mpsc::channel(config.max_scheduled_work_queue_len);
+        let (work_reprocessing_tx, work_reprocessing_rx) =
+            mpsc::channel(config.max_scheduled_work_queue_len);
+
+        Self {
+            beacon_processor_tx: BeaconProcessorSend(beacon_processor_tx),
+            beacon_processor_rx,
+            work_reprocessing_rx,
+            work_reprocessing_tx,
+        }
+    }
+}
+
+impl<E: EthSpec> Default for BeaconProcessorChannels<E> {
+    fn default() -> Self {
+        Self::new(&BeaconProcessorConfig::default())
+    }
+}
 
 /// A simple first-in-first-out queue with a maximum length.
 struct FifoQueue<T> {
@@ -366,394 +414,104 @@ impl DuplicateCache {
 }
 
 /// An event to be processed by the manager task.
-#[derive(Derivative)]
-#[derivative(Debug(bound = "T: BeaconChainTypes"))]
-pub struct WorkEvent<T: BeaconChainTypes> {
-    drop_during_sync: bool,
-    work: Work<T>,
+#[derive(Debug)]
+pub struct WorkEvent<E: EthSpec> {
+    pub drop_during_sync: bool,
+    pub work: Work<E>,
 }
 
-impl<T: BeaconChainTypes> WorkEvent<T> {
-    /// Create a new `Work` event for some unaggregated attestation.
-    pub fn unaggregated_attestation(
-        message_id: MessageId,
-        peer_id: PeerId,
-        attestation: Attestation<T::EthSpec>,
-        subnet_id: SubnetId,
-        should_import: bool,
-        seen_timestamp: Duration,
-    ) -> Self {
-        Self {
-            drop_during_sync: true,
-            work: Work::GossipAttestation {
-                message_id,
-                peer_id,
-                attestation: Box::new(attestation),
-                subnet_id,
-                should_import,
-                seen_timestamp,
-            },
-        }
-    }
-
-    /// Create a new `Work` event for some aggregated attestation.
-    pub fn aggregated_attestation(
-        message_id: MessageId,
-        peer_id: PeerId,
-        aggregate: SignedAggregateAndProof<T::EthSpec>,
-        seen_timestamp: Duration,
-    ) -> Self {
-        Self {
-            drop_during_sync: true,
-            work: Work::GossipAggregate {
-                message_id,
-                peer_id,
-                aggregate: Box::new(aggregate),
-                seen_timestamp,
-            },
-        }
-    }
-
-    /// Create a new `Work` event for some block.
-    pub fn gossip_beacon_block(
-        message_id: MessageId,
-        peer_id: PeerId,
-        peer_client: Client,
-        block: Arc<SignedBeaconBlock<T::EthSpec>>,
-        seen_timestamp: Duration,
-    ) -> Self {
-        Self {
-            drop_during_sync: false,
-            work: Work::GossipBlock {
-                message_id,
-                peer_id,
-                peer_client,
-                block,
-                seen_timestamp,
-            },
-        }
-    }
-
-    /// Create a new `Work` event for some sync committee signature.
-    pub fn gossip_sync_signature(
-        message_id: MessageId,
-        peer_id: PeerId,
-        sync_signature: SyncCommitteeMessage,
-        subnet_id: SyncSubnetId,
-        seen_timestamp: Duration,
-    ) -> Self {
-        Self {
-            drop_during_sync: true,
-            work: Work::GossipSyncSignature {
-                message_id,
-                peer_id,
-                sync_signature: Box::new(sync_signature),
-                subnet_id,
-                seen_timestamp,
-            },
-        }
-    }
-
-    /// Create a new `Work` event for some sync committee contribution.
-    pub fn gossip_sync_contribution(
-        message_id: MessageId,
-        peer_id: PeerId,
-        sync_contribution: SignedContributionAndProof<T::EthSpec>,
-        seen_timestamp: Duration,
-    ) -> Self {
-        Self {
-            drop_during_sync: true,
-            work: Work::GossipSyncContribution {
-                message_id,
-                peer_id,
-                sync_contribution: Box::new(sync_contribution),
-                seen_timestamp,
-            },
-        }
-    }
-
-    /// Create a new `Work` event for some exit.
-    pub fn gossip_voluntary_exit(
-        message_id: MessageId,
-        peer_id: PeerId,
-        voluntary_exit: Box<SignedVoluntaryExit>,
-    ) -> Self {
-        Self {
-            drop_during_sync: false,
-            work: Work::GossipVoluntaryExit {
-                message_id,
-                peer_id,
-                voluntary_exit,
-            },
-        }
-    }
-
-    /// Create a new `Work` event for some proposer slashing.
-    pub fn gossip_proposer_slashing(
-        message_id: MessageId,
-        peer_id: PeerId,
-        proposer_slashing: Box<ProposerSlashing>,
-    ) -> Self {
-        Self {
-            drop_during_sync: false,
-            work: Work::GossipProposerSlashing {
-                message_id,
-                peer_id,
-                proposer_slashing,
-            },
-        }
-    }
-
-    /// Create a new `Work` event for some light client finality update.
-    pub fn gossip_light_client_finality_update(
-        message_id: MessageId,
-        peer_id: PeerId,
-        light_client_finality_update: Box<LightClientFinalityUpdate<T::EthSpec>>,
-        seen_timestamp: Duration,
-    ) -> Self {
-        Self {
-            drop_during_sync: true,
-            work: Work::GossipLightClientFinalityUpdate {
-                message_id,
-                peer_id,
-                light_client_finality_update,
-                seen_timestamp,
-            },
-        }
-    }
-
-    /// Create a new `Work` event for some light client optimistic update.
-    pub fn gossip_light_client_optimistic_update(
-        message_id: MessageId,
-        peer_id: PeerId,
-        light_client_optimistic_update: Box<LightClientOptimisticUpdate<T::EthSpec>>,
-        seen_timestamp: Duration,
-    ) -> Self {
-        Self {
-            drop_during_sync: true,
-            work: Work::GossipLightClientOptimisticUpdate {
-                message_id,
-                peer_id,
-                light_client_optimistic_update,
-                seen_timestamp,
-            },
-        }
-    }
-
-    /// Create a new `Work` event for some attester slashing.
-    pub fn gossip_attester_slashing(
-        message_id: MessageId,
-        peer_id: PeerId,
-        attester_slashing: Box<AttesterSlashing<T::EthSpec>>,
-    ) -> Self {
-        Self {
-            drop_during_sync: false,
-            work: Work::GossipAttesterSlashing {
-                message_id,
-                peer_id,
-                attester_slashing,
-            },
-        }
-    }
-
-    /// Create a new `Work` event for some BLS to execution change.
-    pub fn gossip_bls_to_execution_change(
-        message_id: MessageId,
-        peer_id: PeerId,
-        bls_to_execution_change: Box<SignedBlsToExecutionChange>,
-    ) -> Self {
-        Self {
-            drop_during_sync: false,
-            work: Work::GossipBlsToExecutionChange {
-                message_id,
-                peer_id,
-                bls_to_execution_change,
-            },
-        }
-    }
-
-    /// Create a new `Work` event for some block, where the result from computation (if any) is
-    /// sent to the other side of `result_tx`.
-    pub fn rpc_beacon_block(
-        block_root: Hash256,
-        block: Arc<SignedBeaconBlock<T::EthSpec>>,
-        seen_timestamp: Duration,
-        process_type: BlockProcessType,
-    ) -> Self {
-        Self {
-            drop_during_sync: false,
-            work: Work::RpcBlock {
-                block_root,
-                block,
-                seen_timestamp,
-                process_type,
-                should_process: true,
-            },
-        }
-    }
-
-    /// Create a new work event to import `blocks` as a beacon chain segment.
-    pub fn chain_segment(
-        process_id: ChainSegmentProcessId,
-        blocks: Vec<Arc<SignedBeaconBlock<T::EthSpec>>>,
-    ) -> Self {
-        Self {
-            drop_during_sync: false,
-            work: Work::ChainSegment { process_id, blocks },
-        }
-    }
-
-    /// Create a new work event to process `StatusMessage`s from the RPC network.
-    pub fn status_message(peer_id: PeerId, message: StatusMessage) -> Self {
-        Self {
-            drop_during_sync: false,
-            work: Work::Status { peer_id, message },
-        }
-    }
-
-    /// Create a new work event to process `BlocksByRangeRequest`s from the RPC network.
-    pub fn blocks_by_range_request(
-        peer_id: PeerId,
-        request_id: PeerRequestId,
-        request: BlocksByRangeRequest,
-    ) -> Self {
-        Self {
-            drop_during_sync: false,
-            work: Work::BlocksByRangeRequest {
-                peer_id,
-                request_id,
-                request,
-            },
-        }
-    }
-
-    /// Create a new work event to process `BlocksByRootRequest`s from the RPC network.
-    pub fn blocks_by_roots_request(
-        peer_id: PeerId,
-        request_id: PeerRequestId,
-        request: BlocksByRootRequest,
-    ) -> Self {
-        Self {
-            drop_during_sync: false,
-            work: Work::BlocksByRootsRequest {
-                peer_id,
-                request_id,
-                request,
-            },
-        }
-    }
-
-    /// Create a new work event to process `LightClientBootstrap`s from the RPC network.
-    pub fn lightclient_bootstrap_request(
-        peer_id: PeerId,
-        request_id: PeerRequestId,
-        request: LightClientBootstrapRequest,
-    ) -> Self {
-        Self {
-            drop_during_sync: true,
-            work: Work::LightClientBootstrapRequest {
-                peer_id,
-                request_id,
-                request,
-            },
-        }
-    }
-
+impl<E: EthSpec> WorkEvent<E> {
     /// Get a `str` representation of the type of work this `WorkEvent` contains.
     pub fn work_type(&self) -> &'static str {
         self.work.str_id()
     }
 }
 
-impl<T: BeaconChainTypes> std::convert::From<ReadyWork<T>> for WorkEvent<T> {
-    fn from(ready_work: ReadyWork<T>) -> Self {
+impl<E: EthSpec> From<ReadyWork> for WorkEvent<E> {
+    fn from(ready_work: ReadyWork) -> Self {
         match ready_work {
             ReadyWork::Block(QueuedGossipBlock {
-                peer_id,
-                block,
-                seen_timestamp,
+                beacon_block_slot,
+                beacon_block_root,
+                process_fn,
             }) => Self {
                 drop_during_sync: false,
                 work: Work::DelayedImportBlock {
-                    peer_id,
-                    block,
-                    seen_timestamp,
+                    beacon_block_slot,
+                    beacon_block_root,
+                    process_fn,
                 },
             },
             ReadyWork::RpcBlock(QueuedRpcBlock {
-                block_root,
-                block,
-                seen_timestamp,
-                process_type,
-                should_process,
+                beacon_block_root: _,
+                process_fn,
+                ignore_fn: _,
             }) => Self {
                 drop_during_sync: false,
-                work: Work::RpcBlock {
-                    block_root,
-                    block,
-                    seen_timestamp,
-                    process_type,
-                    should_process,
-                },
+                work: Work::RpcBlock { process_fn },
+            },
+            ReadyWork::IgnoredRpcBlock(IgnoredRpcBlock { process_fn }) => Self {
+                drop_during_sync: false,
+                work: Work::IgnoredRpcBlock { process_fn },
             },
             ReadyWork::Unaggregate(QueuedUnaggregate {
-                peer_id,
-                message_id,
-                attestation,
-                subnet_id,
-                should_import,
-                seen_timestamp,
+                beacon_block_root: _,
+                process_fn,
             }) => Self {
                 drop_during_sync: true,
-                work: Work::UnknownBlockAttestation {
-                    message_id,
-                    peer_id,
-                    attestation,
-                    subnet_id,
-                    should_import,
-                    seen_timestamp,
-                },
+                work: Work::UnknownBlockAttestation { process_fn },
             },
             ReadyWork::Aggregate(QueuedAggregate {
-                peer_id,
-                message_id,
-                attestation,
-                seen_timestamp,
+                process_fn,
+                beacon_block_root: _,
             }) => Self {
                 drop_during_sync: true,
-                work: Work::UnknownBlockAggregate {
-                    message_id,
-                    peer_id,
-                    aggregate: attestation,
-                    seen_timestamp,
-                },
+                work: Work::UnknownBlockAggregate { process_fn },
             },
             ReadyWork::LightClientUpdate(QueuedLightClientUpdate {
-                peer_id,
-                message_id,
-                light_client_optimistic_update,
-                seen_timestamp,
-                ..
+                parent_root,
+                process_fn,
             }) => Self {
                 drop_during_sync: true,
                 work: Work::UnknownLightClientOptimisticUpdate {
-                    message_id,
-                    peer_id,
-                    light_client_optimistic_update,
-                    seen_timestamp,
+                    parent_root,
+                    process_fn,
                 },
             },
-            ReadyWork::BackfillSync(QueuedBackfillBatch { process_id, blocks }) => {
-                WorkEvent::chain_segment(process_id, blocks)
-            }
+            ReadyWork::BackfillSync(QueuedBackfillBatch(process_fn)) => Self {
+                drop_during_sync: false,
+                work: Work::ChainSegmentBackfill(process_fn),
+            },
         }
     }
 }
 
-pub struct BeaconProcessorSend<T: BeaconChainTypes>(pub mpsc::Sender<WorkEvent<T>>);
+/// Items required to verify a batch of unaggregated gossip attestations.
+#[derive(Debug)]
+pub struct GossipAttestationPackage<E: EthSpec> {
+    pub message_id: MessageId,
+    pub peer_id: PeerId,
+    pub attestation: Box<Attestation<E>>,
+    pub subnet_id: SubnetId,
+    pub should_import: bool,
+    pub seen_timestamp: Duration,
+}
 
-impl<T: BeaconChainTypes> BeaconProcessorSend<T> {
-    pub fn try_send(&self, message: WorkEvent<T>) -> Result<(), Box<TrySendError<WorkEvent<T>>>> {
+/// Items required to verify a batch of aggregated gossip attestations.
+#[derive(Debug)]
+pub struct GossipAggregatePackage<E: EthSpec> {
+    pub message_id: MessageId,
+    pub peer_id: PeerId,
+    pub aggregate: Box<SignedAggregateAndProof<E>>,
+    pub beacon_block_root: Hash256,
+    pub seen_timestamp: Duration,
+}
+
+#[derive(Clone)]
+pub struct BeaconProcessorSend<E: EthSpec>(pub mpsc::Sender<WorkEvent<E>>);
+
+impl<E: EthSpec> BeaconProcessorSend<E> {
+    pub fn try_send(&self, message: WorkEvent<E>) -> Result<(), TrySendError<WorkEvent<E>>> {
         let work_type = message.work_type();
         match self.0.try_send(message) {
             Ok(res) => Ok(res),
@@ -762,146 +520,88 @@ impl<T: BeaconChainTypes> BeaconProcessorSend<T> {
                     &metrics::BEACON_PROCESSOR_SEND_ERROR_PER_WORK_TYPE,
                     &[work_type],
                 );
-                Err(Box::new(e))
+                Err(e)
             }
         }
     }
 }
 
-/// A consensus message (or multiple) from the network that requires processing.
-#[derive(Derivative)]
-#[derivative(Debug(bound = "T: BeaconChainTypes"))]
-pub enum Work<T: BeaconChainTypes> {
-    GossipAttestation {
-        message_id: MessageId,
-        peer_id: PeerId,
-        attestation: Box<Attestation<T::EthSpec>>,
-        subnet_id: SubnetId,
-        should_import: bool,
-        seen_timestamp: Duration,
-    },
-    UnknownBlockAttestation {
-        message_id: MessageId,
-        peer_id: PeerId,
-        attestation: Box<Attestation<T::EthSpec>>,
-        subnet_id: SubnetId,
-        should_import: bool,
-        seen_timestamp: Duration,
-    },
-    GossipAttestationBatch {
-        packages: Vec<GossipAttestationPackage<T::EthSpec>>,
-    },
-    GossipAggregate {
-        message_id: MessageId,
-        peer_id: PeerId,
-        aggregate: Box<SignedAggregateAndProof<T::EthSpec>>,
-        seen_timestamp: Duration,
-    },
-    UnknownBlockAggregate {
-        message_id: MessageId,
-        peer_id: PeerId,
-        aggregate: Box<SignedAggregateAndProof<T::EthSpec>>,
-        seen_timestamp: Duration,
-    },
-    UnknownLightClientOptimisticUpdate {
-        message_id: MessageId,
-        peer_id: PeerId,
-        light_client_optimistic_update: Box<LightClientOptimisticUpdate<T::EthSpec>>,
-        seen_timestamp: Duration,
-    },
-    GossipAggregateBatch {
-        packages: Vec<GossipAggregatePackage<T::EthSpec>>,
-    },
-    GossipBlock {
-        message_id: MessageId,
-        peer_id: PeerId,
-        peer_client: Client,
-        block: Arc<SignedBeaconBlock<T::EthSpec>>,
-        seen_timestamp: Duration,
-    },
-    DelayedImportBlock {
-        peer_id: PeerId,
-        block: Box<GossipVerifiedBlock<T>>,
-        seen_timestamp: Duration,
-    },
-    GossipVoluntaryExit {
-        message_id: MessageId,
-        peer_id: PeerId,
-        voluntary_exit: Box<SignedVoluntaryExit>,
-    },
-    GossipProposerSlashing {
-        message_id: MessageId,
-        peer_id: PeerId,
-        proposer_slashing: Box<ProposerSlashing>,
-    },
-    GossipAttesterSlashing {
-        message_id: MessageId,
-        peer_id: PeerId,
-        attester_slashing: Box<AttesterSlashing<T::EthSpec>>,
-    },
-    GossipSyncSignature {
-        message_id: MessageId,
-        peer_id: PeerId,
-        sync_signature: Box<SyncCommitteeMessage>,
-        subnet_id: SyncSubnetId,
-        seen_timestamp: Duration,
-    },
-    GossipSyncContribution {
-        message_id: MessageId,
-        peer_id: PeerId,
-        sync_contribution: Box<SignedContributionAndProof<T::EthSpec>>,
-        seen_timestamp: Duration,
-    },
-    GossipLightClientFinalityUpdate {
-        message_id: MessageId,
-        peer_id: PeerId,
-        light_client_finality_update: Box<LightClientFinalityUpdate<T::EthSpec>>,
-        seen_timestamp: Duration,
-    },
-    GossipLightClientOptimisticUpdate {
-        message_id: MessageId,
-        peer_id: PeerId,
-        light_client_optimistic_update: Box<LightClientOptimisticUpdate<T::EthSpec>>,
-        seen_timestamp: Duration,
-    },
-    RpcBlock {
-        block_root: Hash256,
-        block: Arc<SignedBeaconBlock<T::EthSpec>>,
-        seen_timestamp: Duration,
-        process_type: BlockProcessType,
-        should_process: bool,
-    },
-    ChainSegment {
-        process_id: ChainSegmentProcessId,
-        blocks: Vec<Arc<SignedBeaconBlock<T::EthSpec>>>,
-    },
-    Status {
-        peer_id: PeerId,
-        message: StatusMessage,
-    },
-    BlocksByRangeRequest {
-        peer_id: PeerId,
-        request_id: PeerRequestId,
-        request: BlocksByRangeRequest,
-    },
-    BlocksByRootsRequest {
-        peer_id: PeerId,
-        request_id: PeerRequestId,
-        request: BlocksByRootRequest,
-    },
-    GossipBlsToExecutionChange {
-        message_id: MessageId,
-        peer_id: PeerId,
-        bls_to_execution_change: Box<SignedBlsToExecutionChange>,
-    },
-    LightClientBootstrapRequest {
-        peer_id: PeerId,
-        request_id: PeerRequestId,
-        request: LightClientBootstrapRequest,
-    },
+pub type AsyncFn = Pin<Box<dyn Future<Output = ()> + Send + Sync>>;
+pub type BlockingFn = Box<dyn FnOnce() + Send + Sync>;
+pub type BlockingFnWithManualSendOnIdle = Box<dyn FnOnce(SendOnDrop) + Send + Sync>;
+pub enum BlockingOrAsync {
+    Blocking(BlockingFn),
+    Async(AsyncFn),
 }
 
-impl<T: BeaconChainTypes> Work<T> {
+/// Indicates the type of work to be performed and therefore its priority and
+/// queuing specifics.
+pub enum Work<E: EthSpec> {
+    GossipAttestation {
+        attestation: GossipAttestationPackage<E>,
+        process_individual: Box<dyn FnOnce(GossipAttestationPackage<E>) + Send + Sync>,
+        process_batch: Box<dyn FnOnce(Vec<GossipAttestationPackage<E>>) + Send + Sync>,
+    },
+    UnknownBlockAttestation {
+        process_fn: BlockingFn,
+    },
+    GossipAttestationBatch {
+        attestations: Vec<GossipAttestationPackage<E>>,
+        process_batch: Box<dyn FnOnce(Vec<GossipAttestationPackage<E>>) + Send + Sync>,
+    },
+    GossipAggregate {
+        aggregate: GossipAggregatePackage<E>,
+        process_individual: Box<dyn FnOnce(GossipAggregatePackage<E>) + Send + Sync>,
+        process_batch: Box<dyn FnOnce(Vec<GossipAggregatePackage<E>>) + Send + Sync>,
+    },
+    UnknownBlockAggregate {
+        process_fn: BlockingFn,
+    },
+    UnknownLightClientOptimisticUpdate {
+        parent_root: Hash256,
+        process_fn: BlockingFn,
+    },
+    GossipAggregateBatch {
+        aggregates: Vec<GossipAggregatePackage<E>>,
+        process_batch: Box<dyn FnOnce(Vec<GossipAggregatePackage<E>>) + Send + Sync>,
+    },
+    GossipBlock(AsyncFn),
+    DelayedImportBlock {
+        beacon_block_slot: Slot,
+        beacon_block_root: Hash256,
+        process_fn: AsyncFn,
+    },
+    GossipVoluntaryExit(BlockingFn),
+    GossipProposerSlashing(BlockingFn),
+    GossipAttesterSlashing(BlockingFn),
+    GossipSyncSignature(BlockingFn),
+    GossipSyncContribution(BlockingFn),
+    GossipLightClientFinalityUpdate(BlockingFn),
+    GossipLightClientOptimisticUpdate(BlockingFn),
+    RpcBlock {
+        process_fn: AsyncFn,
+    },
+    IgnoredRpcBlock {
+        process_fn: BlockingFn,
+    },
+    ChainSegment(AsyncFn),
+    ChainSegmentBackfill(AsyncFn),
+    Status(BlockingFn),
+    BlocksByRangeRequest(BlockingFnWithManualSendOnIdle),
+    BlocksByRootsRequest(BlockingFnWithManualSendOnIdle),
+    GossipBlsToExecutionChange(BlockingFn),
+    LightClientBootstrapRequest(BlockingFn),
+    ApiRequestP0(BlockingOrAsync),
+    ApiRequestP1(BlockingOrAsync),
+}
+
+impl<E: EthSpec> fmt::Debug for Work<E> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "{}", self.str_id())
+    }
+}
+
+impl<E: EthSpec> Work<E> {
     /// Provides a `&str` that uniquely identifies each enum variant.
     fn str_id(&self) -> &'static str {
         match self {
@@ -909,58 +609,58 @@ impl<T: BeaconChainTypes> Work<T> {
             Work::GossipAttestationBatch { .. } => GOSSIP_ATTESTATION_BATCH,
             Work::GossipAggregate { .. } => GOSSIP_AGGREGATE,
             Work::GossipAggregateBatch { .. } => GOSSIP_AGGREGATE_BATCH,
-            Work::GossipBlock { .. } => GOSSIP_BLOCK,
+            Work::GossipBlock(_) => GOSSIP_BLOCK,
             Work::DelayedImportBlock { .. } => DELAYED_IMPORT_BLOCK,
-            Work::GossipVoluntaryExit { .. } => GOSSIP_VOLUNTARY_EXIT,
-            Work::GossipProposerSlashing { .. } => GOSSIP_PROPOSER_SLASHING,
-            Work::GossipAttesterSlashing { .. } => GOSSIP_ATTESTER_SLASHING,
-            Work::GossipSyncSignature { .. } => GOSSIP_SYNC_SIGNATURE,
-            Work::GossipSyncContribution { .. } => GOSSIP_SYNC_CONTRIBUTION,
-            Work::GossipLightClientFinalityUpdate { .. } => GOSSIP_LIGHT_CLIENT_FINALITY_UPDATE,
-            Work::GossipLightClientOptimisticUpdate { .. } => GOSSIP_LIGHT_CLIENT_OPTIMISTIC_UPDATE,
+            Work::GossipVoluntaryExit(_) => GOSSIP_VOLUNTARY_EXIT,
+            Work::GossipProposerSlashing(_) => GOSSIP_PROPOSER_SLASHING,
+            Work::GossipAttesterSlashing(_) => GOSSIP_ATTESTER_SLASHING,
+            Work::GossipSyncSignature(_) => GOSSIP_SYNC_SIGNATURE,
+            Work::GossipSyncContribution(_) => GOSSIP_SYNC_CONTRIBUTION,
+            Work::GossipLightClientFinalityUpdate(_) => GOSSIP_LIGHT_CLIENT_FINALITY_UPDATE,
+            Work::GossipLightClientOptimisticUpdate(_) => GOSSIP_LIGHT_CLIENT_OPTIMISTIC_UPDATE,
             Work::RpcBlock { .. } => RPC_BLOCK,
-            Work::ChainSegment {
-                process_id: ChainSegmentProcessId::BackSyncBatchId { .. },
-                ..
-            } => CHAIN_SEGMENT_BACKFILL,
+            Work::IgnoredRpcBlock { .. } => IGNORED_RPC_BLOCK,
             Work::ChainSegment { .. } => CHAIN_SEGMENT,
-            Work::Status { .. } => STATUS_PROCESSING,
-            Work::BlocksByRangeRequest { .. } => BLOCKS_BY_RANGE_REQUEST,
-            Work::BlocksByRootsRequest { .. } => BLOCKS_BY_ROOTS_REQUEST,
-            Work::LightClientBootstrapRequest { .. } => LIGHT_CLIENT_BOOTSTRAP_REQUEST,
+            Work::ChainSegmentBackfill(_) => CHAIN_SEGMENT_BACKFILL,
+            Work::Status(_) => STATUS_PROCESSING,
+            Work::BlocksByRangeRequest(_) => BLOCKS_BY_RANGE_REQUEST,
+            Work::BlocksByRootsRequest(_) => BLOCKS_BY_ROOTS_REQUEST,
+            Work::LightClientBootstrapRequest(_) => LIGHT_CLIENT_BOOTSTRAP_REQUEST,
             Work::UnknownBlockAttestation { .. } => UNKNOWN_BLOCK_ATTESTATION,
             Work::UnknownBlockAggregate { .. } => UNKNOWN_BLOCK_AGGREGATE,
-            Work::GossipBlsToExecutionChange { .. } => GOSSIP_BLS_TO_EXECUTION_CHANGE,
+            Work::GossipBlsToExecutionChange(_) => GOSSIP_BLS_TO_EXECUTION_CHANGE,
             Work::UnknownLightClientOptimisticUpdate { .. } => UNKNOWN_LIGHT_CLIENT_UPDATE,
+            Work::ApiRequestP0 { .. } => API_REQUEST_P0,
+            Work::ApiRequestP1 { .. } => API_REQUEST_P1,
         }
     }
 }
 
 /// Unifies all the messages processed by the `BeaconProcessor`.
-enum InboundEvent<T: BeaconChainTypes> {
+enum InboundEvent<E: EthSpec> {
     /// A worker has completed a task and is free.
     WorkerIdle,
     /// There is new work to be done.
-    WorkEvent(WorkEvent<T>),
+    WorkEvent(WorkEvent<E>),
     /// A work event that was queued for re-processing has become ready.
-    ReprocessingWork(WorkEvent<T>),
+    ReprocessingWork(WorkEvent<E>),
 }
 
 /// Combines the various incoming event streams for the `BeaconProcessor` into a single stream.
 ///
 /// This struct has a similar purpose to `tokio::select!`, however it allows for more fine-grained
 /// control (specifically in the ordering of event processing).
-struct InboundEvents<T: BeaconChainTypes> {
+struct InboundEvents<E: EthSpec> {
     /// Used by workers when they finish a task.
     idle_rx: mpsc::Receiver<()>,
     /// Used by upstream processes to send new work to the `BeaconProcessor`.
-    event_rx: mpsc::Receiver<WorkEvent<T>>,
+    event_rx: mpsc::Receiver<WorkEvent<E>>,
     /// Used internally for queuing work ready to be re-processed.
-    reprocess_work_rx: mpsc::Receiver<ReadyWork<T>>,
+    reprocess_work_rx: mpsc::Receiver<ReadyWork>,
 }
 
-impl<T: BeaconChainTypes> Stream for InboundEvents<T> {
-    type Item = InboundEvent<T>;
+impl<E: EthSpec> Stream for InboundEvents<E> {
+    type Item = InboundEvent<E>;
 
     fn poll_next(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Option<Self::Item>> {
         // Always check for idle workers before anything else. This allows us to ensure that a big
@@ -1001,47 +701,39 @@ impl<T: BeaconChainTypes> Stream for InboundEvents<T> {
     }
 }
 
-/// Defines if and where we will store the SSZ files of invalid blocks.
-#[derive(Clone)]
-pub enum InvalidBlockStorage {
-    Enabled(PathBuf),
-    Disabled,
-}
-
 /// A mutli-threaded processor for messages received on the network
 /// that need to be processed by the `BeaconChain`
 ///
 /// See module level documentation for more information.
-pub struct BeaconProcessor<T: BeaconChainTypes> {
-    pub beacon_chain: Weak<BeaconChain<T>>,
-    pub network_tx: mpsc::UnboundedSender<NetworkMessage<T::EthSpec>>,
-    pub sync_tx: mpsc::UnboundedSender<SyncMessage<T::EthSpec>>,
-    pub network_globals: Arc<NetworkGlobals<T::EthSpec>>,
+pub struct BeaconProcessor<E: EthSpec> {
+    pub network_globals: Arc<NetworkGlobals<E>>,
     pub executor: TaskExecutor,
-    pub max_workers: usize,
     pub current_workers: usize,
-    pub importing_blocks: DuplicateCache,
-    pub invalid_block_storage: InvalidBlockStorage,
+    pub config: BeaconProcessorConfig,
     pub log: Logger,
 }
 
-impl<T: BeaconChainTypes> BeaconProcessor<T> {
+impl<E: EthSpec> BeaconProcessor<E> {
     /// Spawns the "manager" task which checks the receiver end of the returned `Sender` for
     /// messages which contain some new work which will be:
     ///
     /// - Performed immediately, if a worker is available.
     /// - Queued for later processing, if no worker is currently available.
     ///
-    /// Only `self.max_workers` will ever be spawned at one time. Each worker is a `tokio` task
+    /// Only `self.config.max_workers` will ever be spawned at one time. Each worker is a `tokio` task
     /// started with `spawn_blocking`.
     ///
     /// The optional `work_journal_tx` allows for an outside process to receive a log of all work
     /// events processed by `self`. This should only be used during testing.
-    pub fn spawn_manager(
+    pub fn spawn_manager<S: SlotClock + 'static>(
         mut self,
-        event_rx: mpsc::Receiver<WorkEvent<T>>,
+        event_rx: mpsc::Receiver<WorkEvent<E>>,
+        work_reprocessing_tx: mpsc::Sender<ReprocessQueueMessage>,
+        work_reprocessing_rx: mpsc::Receiver<ReprocessQueueMessage>,
         work_journal_tx: Option<mpsc::Sender<&'static str>>,
-    ) {
+        slot_clock: S,
+        maximum_gossip_clock_disparity: Duration,
+    ) -> Result<(), String> {
         // Used by workers to communicate that they are finished a task.
         let (idle_tx, idle_rx) = mpsc::channel::<()>(MAX_IDLE_QUEUE_LEN);
 
@@ -1093,22 +785,21 @@ impl<T: BeaconChainTypes> BeaconProcessor<T> {
 
         let mut lcbootstrap_queue = FifoQueue::new(MAX_LIGHT_CLIENT_BOOTSTRAP_QUEUE_LEN);
 
-        let chain = match self.beacon_chain.upgrade() {
-            Some(chain) => chain,
-            // No need to proceed any further if the beacon chain has been dropped, the client
-            // is shutting down.
-            None => return,
-        };
+        let mut api_request_p0_queue = FifoQueue::new(MAX_API_REQUEST_P0_QUEUE_LEN);
+        let mut api_request_p1_queue = FifoQueue::new(MAX_API_REQUEST_P1_QUEUE_LEN);
 
         // Channels for sending work to the re-process scheduler (`work_reprocessing_tx`) and to
         // receive them back once they are ready (`ready_work_rx`).
-        let (ready_work_tx, ready_work_rx) = mpsc::channel(MAX_SCHEDULED_WORK_QUEUE_LEN);
-        let work_reprocessing_tx = spawn_reprocess_scheduler(
+        let (ready_work_tx, ready_work_rx) =
+            mpsc::channel::<ReadyWork>(self.config.max_scheduled_work_queue_len);
+        spawn_reprocess_scheduler(
             ready_work_tx,
+            work_reprocessing_rx,
             &self.executor,
-            chain.slot_clock.clone(),
+            slot_clock,
             self.log.clone(),
-        );
+            maximum_gossip_clock_disparity,
+        )?;
 
         let executor = self.executor.clone();
 
@@ -1121,7 +812,7 @@ impl<T: BeaconChainTypes> BeaconProcessor<T> {
                 reprocess_work_rx: ready_work_rx,
             };
 
-            let enable_backfill_rate_limiting = chain.config.enable_backfill_rate_limiting;
+            let enable_backfill_rate_limiting = self.config.enable_backfill_rate_limiting;
 
             loop {
                 let work_event = match inbound_events.next().await {
@@ -1204,49 +895,50 @@ impl<T: BeaconChainTypes> BeaconProcessor<T> {
                     let _ = work_journal_tx.try_send(id);
                 }
 
-                let can_spawn = self.current_workers < self.max_workers;
+                let can_spawn = self.current_workers < self.config.max_workers;
                 let drop_during_sync = work_event
                     .as_ref()
                     .map_or(false, |event| event.drop_during_sync);
 
+                let idle_tx = idle_tx.clone();
                 match work_event {
                     // There is no new work event, but we are able to spawn a new worker.
                     //
                     // We don't check the `work.drop_during_sync` here. We assume that if it made
                     // it into the queue at any point then we should process it.
                     None if can_spawn => {
-                        let toolbox = Toolbox {
-                            idle_tx: idle_tx.clone(),
-                            work_reprocessing_tx: work_reprocessing_tx.clone(),
-                        };
-
                         // Check for chain segments first, they're the most efficient way to get
                         // blocks into the system.
                         if let Some(item) = chain_segment_queue.pop() {
-                            self.spawn_worker(item, toolbox);
+                            self.spawn_worker(item, idle_tx);
                         // Check sync blocks before gossip blocks, since we've already explicitly
                         // requested these blocks.
                         } else if let Some(item) = rpc_block_queue.pop() {
-                            self.spawn_worker(item, toolbox);
+                            self.spawn_worker(item, idle_tx);
                         // Check delayed blocks before gossip blocks, the gossip blocks might rely
                         // on the delayed ones.
                         } else if let Some(item) = delayed_block_queue.pop() {
-                            self.spawn_worker(item, toolbox);
+                            self.spawn_worker(item, idle_tx);
                         // Check gossip blocks before gossip attestations, since a block might be
                         // required to verify some attestations.
                         } else if let Some(item) = gossip_block_queue.pop() {
-                            self.spawn_worker(item, toolbox);
+                            self.spawn_worker(item, idle_tx);
+                        // Check the priority 0 API requests after blocks, but before attestations.
+                        } else if let Some(item) = api_request_p0_queue.pop() {
+                            self.spawn_worker(item, idle_tx);
                         // Check the aggregates, *then* the unaggregates since we assume that
                         // aggregates are more valuable to local validators and effectively give us
                         // more information with less signature verification time.
                         } else if aggregate_queue.len() > 0 {
-                            let batch_size =
-                                cmp::min(aggregate_queue.len(), MAX_GOSSIP_AGGREGATE_BATCH_SIZE);
+                            let batch_size = cmp::min(
+                                aggregate_queue.len(),
+                                self.config.max_gossip_aggregate_batch_size,
+                            );
 
                             if batch_size < 2 {
                                 // One single aggregate is in the queue, process it individually.
                                 if let Some(item) = aggregate_queue.pop() {
-                                    self.spawn_worker(item, toolbox);
+                                    self.spawn_worker(item, idle_tx);
                                 }
                             } else {
                                 // Collect two or more aggregates into a batch, so they can take
@@ -1254,32 +946,45 @@ impl<T: BeaconChainTypes> BeaconProcessor<T> {
                                 //
                                 // Note: this will convert the `Work::GossipAggregate` item into a
                                 // `Work::GossipAggregateBatch` item.
-                                let mut packages = Vec::with_capacity(batch_size);
+                                let mut aggregates = Vec::with_capacity(batch_size);
+                                let mut process_batch_opt = None;
                                 for _ in 0..batch_size {
                                     if let Some(item) = aggregate_queue.pop() {
                                         match item {
                                             Work::GossipAggregate {
-                                                message_id,
-                                                peer_id,
                                                 aggregate,
-                                                seen_timestamp,
+                                                process_individual: _,
+                                                process_batch,
                                             } => {
-                                                packages.push(GossipAggregatePackage::new(
-                                                    message_id,
-                                                    peer_id,
-                                                    aggregate,
-                                                    seen_timestamp,
-                                                ));
+                                                aggregates.push(aggregate);
+                                                if process_batch_opt.is_none() {
+                                                    process_batch_opt = Some(process_batch);
+                                                }
                                             }
                                             _ => {
-                                                error!(self.log, "Invalid item in aggregate queue")
+                                                error!(self.log, "Invalid item in aggregate queue");
                                             }
                                         }
                                     }
                                 }
 
-                                // Process all aggregates with a single worker.
-                                self.spawn_worker(Work::GossipAggregateBatch { packages }, toolbox)
+                                if let Some(process_batch) = process_batch_opt {
+                                    // Process all aggregates with a single worker.
+                                    self.spawn_worker(
+                                        Work::GossipAggregateBatch {
+                                            aggregates,
+                                            process_batch,
+                                        },
+                                        idle_tx,
+                                    )
+                                } else {
+                                    // There is no good reason for this to
+                                    // happen, it is a serious logic error.
+                                    // Since we only form batches when multiple
+                                    // work items exist, we should always have a
+                                    // work closure at this point.
+                                    crit!(self.log, "Missing aggregate work");
+                                }
                             }
                         // Check the unaggregated attestation queue.
                         //
@@ -1287,13 +992,13 @@ impl<T: BeaconChainTypes> BeaconProcessor<T> {
                         } else if attestation_queue.len() > 0 {
                             let batch_size = cmp::min(
                                 attestation_queue.len(),
-                                MAX_GOSSIP_ATTESTATION_BATCH_SIZE,
+                                self.config.max_gossip_attestation_batch_size,
                             );
 
                             if batch_size < 2 {
                                 // One single attestation is in the queue, process it individually.
                                 if let Some(item) = attestation_queue.pop() {
-                                    self.spawn_worker(item, toolbox);
+                                    self.spawn_worker(item, idle_tx);
                                 }
                             } else {
                                 // Collect two or more attestations into a batch, so they can take
@@ -1301,26 +1006,20 @@ impl<T: BeaconChainTypes> BeaconProcessor<T> {
                                 //
                                 // Note: this will convert the `Work::GossipAttestation` item into a
                                 // `Work::GossipAttestationBatch` item.
-                                let mut packages = Vec::with_capacity(batch_size);
+                                let mut attestations = Vec::with_capacity(batch_size);
+                                let mut process_batch_opt = None;
                                 for _ in 0..batch_size {
                                     if let Some(item) = attestation_queue.pop() {
                                         match item {
                                             Work::GossipAttestation {
-                                                message_id,
-                                                peer_id,
                                                 attestation,
-                                                subnet_id,
-                                                should_import,
-                                                seen_timestamp,
+                                                process_individual: _,
+                                                process_batch,
                                             } => {
-                                                packages.push(GossipAttestationPackage::new(
-                                                    message_id,
-                                                    peer_id,
-                                                    attestation,
-                                                    subnet_id,
-                                                    should_import,
-                                                    seen_timestamp,
-                                                ));
+                                                attestations.push(attestation);
+                                                if process_batch_opt.is_none() {
+                                                    process_batch_opt = Some(process_batch);
+                                                }
                                             }
                                             _ => error!(
                                                 self.log,
@@ -1330,54 +1029,72 @@ impl<T: BeaconChainTypes> BeaconProcessor<T> {
                                     }
                                 }
 
-                                // Process all attestations with a single worker.
-                                self.spawn_worker(
-                                    Work::GossipAttestationBatch { packages },
-                                    toolbox,
-                                )
+                                if let Some(process_batch) = process_batch_opt {
+                                    // Process all attestations with a single worker.
+                                    self.spawn_worker(
+                                        Work::GossipAttestationBatch {
+                                            attestations,
+                                            process_batch,
+                                        },
+                                        idle_tx,
+                                    )
+                                } else {
+                                    // There is no good reason for this to
+                                    // happen, it is a serious logic error.
+                                    // Since we only form batches when multiple
+                                    // work items exist, we should always have a
+                                    // work closure at this point.
+                                    crit!(self.log, "Missing attestations work");
+                                }
                             }
                         // Check sync committee messages after attestations as their rewards are lesser
                         // and they don't influence fork choice.
                         } else if let Some(item) = sync_contribution_queue.pop() {
-                            self.spawn_worker(item, toolbox);
+                            self.spawn_worker(item, idle_tx);
                         } else if let Some(item) = sync_message_queue.pop() {
-                            self.spawn_worker(item, toolbox);
+                            self.spawn_worker(item, idle_tx);
                         // Aggregates and unaggregates queued for re-processing are older and we
                         // care about fresher ones, so check those first.
                         } else if let Some(item) = unknown_block_aggregate_queue.pop() {
-                            self.spawn_worker(item, toolbox);
+                            self.spawn_worker(item, idle_tx);
                         } else if let Some(item) = unknown_block_attestation_queue.pop() {
-                            self.spawn_worker(item, toolbox);
+                            self.spawn_worker(item, idle_tx);
                         // Check RPC methods next. Status messages are needed for sync so
                         // prioritize them over syncing requests from other peers (BlocksByRange
                         // and BlocksByRoot)
                         } else if let Some(item) = status_queue.pop() {
-                            self.spawn_worker(item, toolbox);
+                            self.spawn_worker(item, idle_tx);
                         } else if let Some(item) = bbrange_queue.pop() {
-                            self.spawn_worker(item, toolbox);
+                            self.spawn_worker(item, idle_tx);
                         } else if let Some(item) = bbroots_queue.pop() {
-                            self.spawn_worker(item, toolbox);
+                            self.spawn_worker(item, idle_tx);
                         // Check slashings after all other consensus messages so we prioritize
                         // following head.
                         //
                         // Check attester slashings before proposer slashings since they have the
                         // potential to slash multiple validators at once.
                         } else if let Some(item) = gossip_attester_slashing_queue.pop() {
-                            self.spawn_worker(item, toolbox);
+                            self.spawn_worker(item, idle_tx);
                         } else if let Some(item) = gossip_proposer_slashing_queue.pop() {
-                            self.spawn_worker(item, toolbox);
+                            self.spawn_worker(item, idle_tx);
                         // Check exits and address changes late since our validators don't get
                         // rewards from them.
                         } else if let Some(item) = gossip_voluntary_exit_queue.pop() {
-                            self.spawn_worker(item, toolbox);
+                            self.spawn_worker(item, idle_tx);
                         } else if let Some(item) = gossip_bls_to_execution_change_queue.pop() {
-                            self.spawn_worker(item, toolbox);
+                            self.spawn_worker(item, idle_tx);
+                        // Check the priority 1 API requests after we've
+                        // processed all the interesting things from the network
+                        // and things required for us to stay in good repute
+                        // with our P2P peers.
+                        } else if let Some(item) = api_request_p1_queue.pop() {
+                            self.spawn_worker(item, idle_tx);
                         // Handle backfill sync chain segments.
                         } else if let Some(item) = backfill_chain_segment.pop() {
-                            self.spawn_worker(item, toolbox);
+                            self.spawn_worker(item, idle_tx);
                         // This statement should always be the final else statement.
                         } else if let Some(item) = lcbootstrap_queue.pop() {
-                            self.spawn_worker(item, toolbox);
+                            self.spawn_worker(item, idle_tx);
                         } else {
                             // Let the journal know that a worker is freed and there's nothing else
                             // for it to do.
@@ -1419,13 +1136,9 @@ impl<T: BeaconChainTypes> BeaconProcessor<T> {
                     // it.
                     Some(WorkEvent { work, .. }) => {
                         let work_id = work.str_id();
-                        let toolbox = Toolbox {
-                            idle_tx: idle_tx.clone(),
-                            work_reprocessing_tx: work_reprocessing_tx.clone(),
-                        };
 
                         match work {
-                            _ if can_spawn => self.spawn_worker(work, toolbox),
+                            _ if can_spawn => self.spawn_worker(work, idle_tx),
                             Work::GossipAttestation { .. } => attestation_queue.push(work),
                             // Attestation batches are formed internally within the
                             // `BeaconProcessor`, they are not sent from external services.
@@ -1467,16 +1180,15 @@ impl<T: BeaconChainTypes> BeaconProcessor<T> {
                             Work::GossipLightClientOptimisticUpdate { .. } => {
                                 optimistic_update_queue.push(work, work_id, &self.log)
                             }
-                            Work::RpcBlock { .. } => rpc_block_queue.push(work, work_id, &self.log),
-                            Work::ChainSegment { ref process_id, .. } => match process_id {
-                                ChainSegmentProcessId::RangeBatchId { .. }
-                                | ChainSegmentProcessId::ParentLookup { .. } => {
-                                    chain_segment_queue.push(work, work_id, &self.log)
-                                }
-                                ChainSegmentProcessId::BackSyncBatchId { .. } => {
-                                    backfill_chain_segment.push(work, work_id, &self.log)
-                                }
-                            },
+                            Work::RpcBlock { .. } | Work::IgnoredRpcBlock { .. } => {
+                                rpc_block_queue.push(work, work_id, &self.log)
+                            }
+                            Work::ChainSegment { .. } => {
+                                chain_segment_queue.push(work, work_id, &self.log)
+                            }
+                            Work::ChainSegmentBackfill { .. } => {
+                                backfill_chain_segment.push(work, work_id, &self.log)
+                            }
                             Work::Status { .. } => status_queue.push(work, work_id, &self.log),
                             Work::BlocksByRangeRequest { .. } => {
                                 bbrange_queue.push(work, work_id, &self.log)
@@ -1499,6 +1211,12 @@ impl<T: BeaconChainTypes> BeaconProcessor<T> {
                             Work::UnknownLightClientOptimisticUpdate { .. } => {
                                 unknown_light_client_update_queue.push(work, work_id, &self.log)
                             }
+                            Work::ApiRequestP0 { .. } => {
+                                api_request_p0_queue.push(work, work_id, &self.log)
+                            }
+                            Work::ApiRequestP1 { .. } => {
+                                api_request_p1_queue.push(work, work_id, &self.log)
+                            }
                         }
                     }
                 }
@@ -1555,6 +1273,14 @@ impl<T: BeaconChainTypes> BeaconProcessor<T> {
                     &metrics::BEACON_PROCESSOR_BLS_TO_EXECUTION_CHANGE_QUEUE_TOTAL,
                     gossip_bls_to_execution_change_queue.len() as i64,
                 );
+                metrics::set_gauge(
+                    &metrics::BEACON_PROCESSOR_API_REQUEST_P0_QUEUE_TOTAL,
+                    api_request_p0_queue.len() as i64,
+                );
+                metrics::set_gauge(
+                    &metrics::BEACON_PROCESSOR_API_REQUEST_P1_QUEUE_TOTAL,
+                    api_request_p1_queue.len() as i64,
+                );
 
                 if aggregate_queue.is_full() && aggregate_debounce.elapsed() {
                     error!(
@@ -1578,15 +1304,13 @@ impl<T: BeaconChainTypes> BeaconProcessor<T> {
 
         // Spawn on the core executor.
         executor.spawn(manager_future, MANAGER_TASK_NAME);
+        Ok(())
     }
 
     /// Spawns a blocking worker thread to process some `Work`.
     ///
     /// Sends an message on `idle_tx` when the work is complete and the task is stopping.
-    fn spawn_worker(&mut self, work: Work<T>, toolbox: Toolbox<T>) {
-        let idle_tx = toolbox.idle_tx;
-        let work_reprocessing_tx = toolbox.work_reprocessing_tx;
-
+    fn spawn_worker(&mut self, work: Work<E>, idle_tx: mpsc::Sender<()>) {
         let work_id = work.str_id();
         let worker_timer =
             metrics::start_timer_vec(&metrics::BEACON_PROCESSOR_WORKER_TIME, &[work_id]);
@@ -1609,27 +1333,8 @@ impl<T: BeaconChainTypes> BeaconProcessor<T> {
         let worker_id = self.current_workers;
         self.current_workers = self.current_workers.saturating_add(1);
 
-        let chain = if let Some(chain) = self.beacon_chain.upgrade() {
-            chain
-        } else {
-            debug!(
-                self.log,
-                "Beacon chain dropped, shutting down";
-            );
-            return;
-        };
-
         let executor = self.executor.clone();
 
-        let worker = Worker {
-            chain,
-            network_tx: self.network_tx.clone(),
-            sync_tx: self.sync_tx.clone(),
-            log: self.log.clone(),
-        };
-
-        let duplicate_cache = self.importing_blocks.clone();
-
         trace!(
             self.log,
             "Spawning beacon processor worker";
@@ -1638,349 +1343,76 @@ impl<T: BeaconChainTypes> BeaconProcessor<T> {
         );
 
         let task_spawner = TaskSpawner {
-            executor: executor.clone(),
+            executor,
             send_idle_on_drop,
         };
 
-        let sub_executor = executor;
         match work {
-            /*
-             * Individual unaggregated attestation verification.
-             */
             Work::GossipAttestation {
-                message_id,
-                peer_id,
                 attestation,
-                subnet_id,
-                should_import,
-                seen_timestamp,
+                process_individual,
+                process_batch: _,
             } => task_spawner.spawn_blocking(move || {
-                worker.process_gossip_attestation(
-                    message_id,
-                    peer_id,
-                    attestation,
-                    subnet_id,
-                    should_import,
-                    Some(work_reprocessing_tx),
-                    seen_timestamp,
-                )
+                process_individual(attestation);
             }),
-            /*
-             * Batched unaggregated attestation verification.
-             */
-            Work::GossipAttestationBatch { packages } => task_spawner.spawn_blocking(|| {
-                worker.process_gossip_attestation_batch(packages, Some(work_reprocessing_tx))
+            Work::GossipAttestationBatch {
+                attestations,
+                process_batch,
+            } => task_spawner.spawn_blocking(move || {
+                process_batch(attestations);
             }),
-            /*
-             * Individual aggregated attestation verification.
-             */
             Work::GossipAggregate {
-                message_id,
-                peer_id,
                 aggregate,
-                seen_timestamp,
+                process_individual,
+                process_batch: _,
             } => task_spawner.spawn_blocking(move || {
-                worker.process_gossip_aggregate(
-                    message_id,
-                    peer_id,
-                    aggregate,
-                    Some(work_reprocessing_tx),
-                    seen_timestamp,
-                )
+                process_individual(aggregate);
             }),
-            /*
-             * Batched aggregated attestation verification.
-             */
-            Work::GossipAggregateBatch { packages } => task_spawner.spawn_blocking(|| {
-                worker.process_gossip_aggregate_batch(packages, Some(work_reprocessing_tx))
-            }),
-            /*
-             * Verification for beacon blocks received on gossip.
-             */
-            Work::GossipBlock {
-                message_id,
-                peer_id,
-                peer_client,
-                block,
-                seen_timestamp,
-            } => {
-                let invalid_block_storage = self.invalid_block_storage.clone();
-                task_spawner.spawn_async(async move {
-                    worker
-                        .process_gossip_block(
-                            message_id,
-                            peer_id,
-                            peer_client,
-                            block,
-                            work_reprocessing_tx,
-                            duplicate_cache,
-                            invalid_block_storage,
-                            seen_timestamp,
-                        )
-                        .await
-                })
-            }
-            /*
-             * Import for blocks that we received earlier than their intended slot.
-             */
-            Work::DelayedImportBlock {
-                peer_id,
-                block,
-                seen_timestamp,
-            } => {
-                let invalid_block_storage = self.invalid_block_storage.clone();
-                task_spawner.spawn_async(worker.process_gossip_verified_block(
-                    peer_id,
-                    *block,
-                    work_reprocessing_tx,
-                    invalid_block_storage,
-                    seen_timestamp,
-                ))
-            }
-            /*
-             * Voluntary exits received on gossip.
-             */
-            Work::GossipVoluntaryExit {
-                message_id,
-                peer_id,
-                voluntary_exit,
+            Work::GossipAggregateBatch {
+                aggregates,
+                process_batch,
             } => task_spawner.spawn_blocking(move || {
-                worker.process_gossip_voluntary_exit(message_id, peer_id, *voluntary_exit)
+                process_batch(aggregates);
             }),
-            /*
-             * Proposer slashings received on gossip.
-             */
-            Work::GossipProposerSlashing {
-                message_id,
-                peer_id,
-                proposer_slashing,
-            } => task_spawner.spawn_blocking(move || {
-                worker.process_gossip_proposer_slashing(message_id, peer_id, *proposer_slashing)
-            }),
-            /*
-             * Attester slashings received on gossip.
-             */
-            Work::GossipAttesterSlashing {
-                message_id,
-                peer_id,
-                attester_slashing,
-            } => task_spawner.spawn_blocking(move || {
-                worker.process_gossip_attester_slashing(message_id, peer_id, *attester_slashing)
-            }),
-            /*
-             * Sync committee message verification.
-             */
-            Work::GossipSyncSignature {
-                message_id,
-                peer_id,
-                sync_signature,
-                subnet_id,
-                seen_timestamp,
-            } => task_spawner.spawn_blocking(move || {
-                worker.process_gossip_sync_committee_signature(
-                    message_id,
-                    peer_id,
-                    *sync_signature,
-                    subnet_id,
-                    seen_timestamp,
-                )
-            }),
-            /*
-             * Sync contribution verification.
-             */
-            Work::GossipSyncContribution {
-                message_id,
-                peer_id,
-                sync_contribution,
-                seen_timestamp,
-            } => task_spawner.spawn_blocking(move || {
-                worker.process_sync_committee_contribution(
-                    message_id,
-                    peer_id,
-                    *sync_contribution,
-                    seen_timestamp,
-                )
-            }),
-            /*
-             * BLS to execution change verification.
-             */
-            Work::GossipBlsToExecutionChange {
-                message_id,
-                peer_id,
-                bls_to_execution_change,
-            } => task_spawner.spawn_blocking(move || {
-                worker.process_gossip_bls_to_execution_change(
-                    message_id,
-                    peer_id,
-                    *bls_to_execution_change,
-                )
-            }),
-            /*
-             * Light client finality update verification.
-             */
-            Work::GossipLightClientFinalityUpdate {
-                message_id,
-                peer_id,
-                light_client_finality_update,
-                seen_timestamp,
-            } => task_spawner.spawn_blocking(move || {
-                worker.process_gossip_finality_update(
-                    message_id,
-                    peer_id,
-                    *light_client_finality_update,
-                    seen_timestamp,
-                )
-            }),
-            /*
-             * Light client optimistic update verification.
-             */
-            Work::GossipLightClientOptimisticUpdate {
-                message_id,
-                peer_id,
-                light_client_optimistic_update,
-                seen_timestamp,
-            } => task_spawner.spawn_blocking(move || {
-                worker.process_gossip_optimistic_update(
-                    message_id,
-                    peer_id,
-                    *light_client_optimistic_update,
-                    Some(work_reprocessing_tx),
-                    seen_timestamp,
-                )
-            }),
-            /*
-             * Verification for beacon blocks received during syncing via RPC.
-             */
-            Work::RpcBlock {
-                block_root,
-                block,
-                seen_timestamp,
-                process_type,
-                should_process,
-            } => task_spawner.spawn_async(worker.process_rpc_block(
-                block_root,
-                block,
-                seen_timestamp,
-                process_type,
-                work_reprocessing_tx,
-                duplicate_cache,
-                should_process,
-            )),
-            /*
-             * Verification for a chain segment (multiple blocks).
-             */
-            Work::ChainSegment { process_id, blocks } => {
-                let notify_execution_layer = if self
-                    .network_globals
-                    .sync_state
-                    .read()
-                    .is_syncing_finalized()
-                {
-                    NotifyExecutionLayer::No
-                } else {
-                    NotifyExecutionLayer::Yes
-                };
-
-                task_spawner.spawn_async(async move {
-                    worker
-                        .process_chain_segment(process_id, blocks, notify_execution_layer)
-                        .await
-                })
-            }
-            /*
-             * Processing of Status Messages.
-             */
-            Work::Status { peer_id, message } => {
-                task_spawner.spawn_blocking(move || worker.process_status(peer_id, message))
-            }
-            /*
-             * Processing of range syncing requests from other peers.
-             */
-            Work::BlocksByRangeRequest {
-                peer_id,
-                request_id,
-                request,
-            } => task_spawner.spawn_blocking_with_manual_send_idle(move |send_idle_on_drop| {
-                worker.handle_blocks_by_range_request(
-                    sub_executor,
-                    send_idle_on_drop,
-                    peer_id,
-                    request_id,
-                    request,
-                )
-            }),
-            /*
-             * Processing of blocks by roots requests from other peers.
-             */
-            Work::BlocksByRootsRequest {
-                peer_id,
-                request_id,
-                request,
-            } => task_spawner.spawn_blocking_with_manual_send_idle(move |send_idle_on_drop| {
-                worker.handle_blocks_by_root_request(
-                    sub_executor,
-                    send_idle_on_drop,
-                    peer_id,
-                    request_id,
-                    request,
-                )
-            }),
-            /*
-             * Processing of lightclient bootstrap requests from other peers.
-             */
-            Work::LightClientBootstrapRequest {
-                peer_id,
-                request_id,
-                request,
-            } => task_spawner.spawn_blocking(move || {
-                worker.handle_light_client_bootstrap(peer_id, request_id, request)
-            }),
-            Work::UnknownBlockAttestation {
-                message_id,
-                peer_id,
-                attestation,
-                subnet_id,
-                should_import,
-                seen_timestamp,
-            } => task_spawner.spawn_blocking(move || {
-                worker.process_gossip_attestation(
-                    message_id,
-                    peer_id,
-                    attestation,
-                    subnet_id,
-                    should_import,
-                    None, // Do not allow this attestation to be re-processed beyond this point.
-                    seen_timestamp,
-                )
-            }),
-            Work::UnknownBlockAggregate {
-                message_id,
-                peer_id,
-                aggregate,
-                seen_timestamp,
-            } => task_spawner.spawn_blocking(move || {
-                worker.process_gossip_aggregate(
-                    message_id,
-                    peer_id,
-                    aggregate,
-                    None,
-                    seen_timestamp,
-                )
+            Work::ChainSegment(process_fn) => task_spawner.spawn_async(async move {
+                process_fn.await;
             }),
+            Work::UnknownBlockAttestation { process_fn } => task_spawner.spawn_blocking(process_fn),
+            Work::UnknownBlockAggregate { process_fn } => task_spawner.spawn_blocking(process_fn),
             Work::UnknownLightClientOptimisticUpdate {
-                message_id,
-                peer_id,
-                light_client_optimistic_update,
-                seen_timestamp,
-            } => task_spawner.spawn_blocking(move || {
-                worker.process_gossip_optimistic_update(
-                    message_id,
-                    peer_id,
-                    *light_client_optimistic_update,
-                    None,
-                    seen_timestamp,
-                )
+                parent_root: _,
+                process_fn,
+            } => task_spawner.spawn_blocking(process_fn),
+            Work::DelayedImportBlock {
+                beacon_block_slot: _,
+                beacon_block_root: _,
+                process_fn,
+            } => task_spawner.spawn_async(process_fn),
+            Work::RpcBlock { process_fn } => task_spawner.spawn_async(process_fn),
+            Work::IgnoredRpcBlock { process_fn } => task_spawner.spawn_blocking(process_fn),
+            Work::GossipBlock(work) => task_spawner.spawn_async(async move {
+                work.await;
             }),
+            Work::BlocksByRangeRequest(work) | Work::BlocksByRootsRequest(work) => {
+                task_spawner.spawn_blocking_with_manual_send_idle(work)
+            }
+            Work::ChainSegmentBackfill(process_fn) => task_spawner.spawn_async(process_fn),
+            Work::ApiRequestP0(process_fn) | Work::ApiRequestP1(process_fn) => match process_fn {
+                BlockingOrAsync::Blocking(process_fn) => task_spawner.spawn_blocking(process_fn),
+                BlockingOrAsync::Async(process_fn) => task_spawner.spawn_async(process_fn),
+            },
+            Work::GossipVoluntaryExit(process_fn)
+            | Work::GossipProposerSlashing(process_fn)
+            | Work::GossipAttesterSlashing(process_fn)
+            | Work::GossipSyncSignature(process_fn)
+            | Work::GossipSyncContribution(process_fn)
+            | Work::GossipLightClientFinalityUpdate(process_fn)
+            | Work::GossipLightClientOptimisticUpdate(process_fn)
+            | Work::Status(process_fn)
+            | Work::GossipBlsToExecutionChange(process_fn)
+            | Work::LightClientBootstrapRequest(process_fn) => {
+                task_spawner.spawn_blocking(process_fn)
+            }
         };
     }
 }
diff --git a/beacon_node/beacon_processor/src/metrics.rs b/beacon_node/beacon_processor/src/metrics.rs
new file mode 100644
index 0000000000..e14c39e9a8
--- /dev/null
+++ b/beacon_node/beacon_processor/src/metrics.rs
@@ -0,0 +1,150 @@
+pub use lighthouse_metrics::*;
+
+lazy_static::lazy_static! {
+
+    /*
+     * Gossip processor
+     */
+    pub static ref BEACON_PROCESSOR_WORK_EVENTS_RX_COUNT: Result<IntCounterVec> = try_create_int_counter_vec(
+        "beacon_processor_work_events_rx_count",
+        "Count of work events received (but not necessarily processed)",
+        &["type"]
+    );
+    pub static ref BEACON_PROCESSOR_WORK_EVENTS_IGNORED_COUNT: Result<IntCounterVec> = try_create_int_counter_vec(
+        "beacon_processor_work_events_ignored_count",
+        "Count of work events purposefully ignored",
+        &["type"]
+    );
+    pub static ref BEACON_PROCESSOR_WORK_EVENTS_STARTED_COUNT: Result<IntCounterVec> = try_create_int_counter_vec(
+        "beacon_processor_work_events_started_count",
+        "Count of work events which have been started by a worker",
+        &["type"]
+    );
+    pub static ref BEACON_PROCESSOR_WORKER_TIME: Result<HistogramVec> = try_create_histogram_vec(
+        "beacon_processor_worker_time",
+        "Time taken for a worker to fully process some parcel of work.",
+        &["type"]
+    );
+    pub static ref BEACON_PROCESSOR_WORKERS_SPAWNED_TOTAL: Result<IntCounter> = try_create_int_counter(
+        "beacon_processor_workers_spawned_total",
+        "The number of workers ever spawned by the gossip processing pool."
+    );
+    pub static ref BEACON_PROCESSOR_WORKERS_ACTIVE_TOTAL: Result<IntGauge> = try_create_int_gauge(
+        "beacon_processor_workers_active_total",
+        "Count of active workers in the gossip processing pool."
+    );
+    pub static ref BEACON_PROCESSOR_IDLE_EVENTS_TOTAL: Result<IntCounter> = try_create_int_counter(
+        "beacon_processor_idle_events_total",
+        "Count of idle events processed by the gossip processor manager."
+    );
+    pub static ref BEACON_PROCESSOR_EVENT_HANDLING_SECONDS: Result<Histogram> = try_create_histogram(
+        "beacon_processor_event_handling_seconds",
+        "Time spent handling a new message and allocating it to a queue or worker."
+    );
+    // Gossip blocks.
+    pub static ref BEACON_PROCESSOR_GOSSIP_BLOCK_QUEUE_TOTAL: Result<IntGauge> = try_create_int_gauge(
+        "beacon_processor_gossip_block_queue_total",
+        "Count of blocks from gossip waiting to be verified."
+    );
+    // Gossip Exits.
+    pub static ref BEACON_PROCESSOR_EXIT_QUEUE_TOTAL: Result<IntGauge> = try_create_int_gauge(
+        "beacon_processor_exit_queue_total",
+        "Count of exits from gossip waiting to be verified."
+    );
+    // Gossip proposer slashings.
+    pub static ref BEACON_PROCESSOR_PROPOSER_SLASHING_QUEUE_TOTAL: Result<IntGauge> = try_create_int_gauge(
+        "beacon_processor_proposer_slashing_queue_total",
+        "Count of proposer slashings from gossip waiting to be verified."
+    );
+    // Gossip attester slashings.
+    pub static ref BEACON_PROCESSOR_ATTESTER_SLASHING_QUEUE_TOTAL: Result<IntGauge> = try_create_int_gauge(
+        "beacon_processor_attester_slashing_queue_total",
+        "Count of attester slashings from gossip waiting to be verified."
+    );
+    // Gossip BLS to execution changes.
+    pub static ref BEACON_PROCESSOR_BLS_TO_EXECUTION_CHANGE_QUEUE_TOTAL: Result<IntGauge> = try_create_int_gauge(
+        "beacon_processor_bls_to_execution_change_queue_total",
+        "Count of address changes from gossip waiting to be verified."
+    );
+    // Rpc blocks.
+    pub static ref BEACON_PROCESSOR_RPC_BLOCK_QUEUE_TOTAL: Result<IntGauge> = try_create_int_gauge(
+        "beacon_processor_rpc_block_queue_total",
+        "Count of blocks from the rpc waiting to be verified."
+    );
+    // Chain segments.
+    pub static ref BEACON_PROCESSOR_CHAIN_SEGMENT_QUEUE_TOTAL: Result<IntGauge> = try_create_int_gauge(
+        "beacon_processor_chain_segment_queue_total",
+        "Count of chain segments from the rpc waiting to be verified."
+    );
+    pub static ref BEACON_PROCESSOR_BACKFILL_CHAIN_SEGMENT_QUEUE_TOTAL: Result<IntGauge> = try_create_int_gauge(
+        "beacon_processor_backfill_chain_segment_queue_total",
+        "Count of backfill chain segments from the rpc waiting to be verified."
+    );
+    // Unaggregated attestations.
+    pub static ref BEACON_PROCESSOR_UNAGGREGATED_ATTESTATION_QUEUE_TOTAL: Result<IntGauge> = try_create_int_gauge(
+        "beacon_processor_unaggregated_attestation_queue_total",
+        "Count of unagg. attestations waiting to be processed."
+    );
+    // Aggregated attestations.
+    pub static ref BEACON_PROCESSOR_AGGREGATED_ATTESTATION_QUEUE_TOTAL: Result<IntGauge> = try_create_int_gauge(
+        "beacon_processor_aggregated_attestation_queue_total",
+        "Count of agg. attestations waiting to be processed."
+    );
+    // Sync committee messages.
+    pub static ref BEACON_PROCESSOR_SYNC_MESSAGE_QUEUE_TOTAL: Result<IntGauge> = try_create_int_gauge(
+        "beacon_processor_sync_message_queue_total",
+        "Count of sync committee messages waiting to be processed."
+    );
+    // Sync contribution.
+    pub static ref BEACON_PROCESSOR_SYNC_CONTRIBUTION_QUEUE_TOTAL: Result<IntGauge> = try_create_int_gauge(
+        "beacon_processor_sync_contribution_queue_total",
+        "Count of sync committee contributions waiting to be processed."
+    );
+    // HTTP API requests.
+    pub static ref BEACON_PROCESSOR_API_REQUEST_P0_QUEUE_TOTAL: Result<IntGauge> = try_create_int_gauge(
+        "beacon_processor_api_request_p0_queue_total",
+        "Count of P0 HTTP requesets waiting to be processed."
+    );
+    pub static ref BEACON_PROCESSOR_API_REQUEST_P1_QUEUE_TOTAL: Result<IntGauge> = try_create_int_gauge(
+        "beacon_processor_api_request_p1_queue_total",
+        "Count of P1 HTTP requesets waiting to be processed."
+    );
+
+    /*
+     * Attestation reprocessing queue metrics.
+     */
+    pub static ref BEACON_PROCESSOR_REPROCESSING_QUEUE_TOTAL: Result<IntGaugeVec> =
+        try_create_int_gauge_vec(
+        "beacon_processor_reprocessing_queue_total",
+        "Count of items in a reprocessing queue.",
+        &["type"]
+    );
+    pub static ref BEACON_PROCESSOR_REPROCESSING_QUEUE_EXPIRED_ATTESTATIONS: Result<IntCounter> = try_create_int_counter(
+        "beacon_processor_reprocessing_queue_expired_attestations",
+        "Number of queued attestations which have expired before a matching block has been found."
+    );
+    pub static ref BEACON_PROCESSOR_REPROCESSING_QUEUE_MATCHED_ATTESTATIONS: Result<IntCounter> = try_create_int_counter(
+        "beacon_processor_reprocessing_queue_matched_attestations",
+        "Number of queued attestations where as matching block has been imported."
+    );
+
+    /*
+     * Light client update reprocessing queue metrics.
+     */
+    pub static ref BEACON_PROCESSOR_REPROCESSING_QUEUE_EXPIRED_OPTIMISTIC_UPDATES: Result<IntCounter> = try_create_int_counter(
+        "beacon_processor_reprocessing_queue_expired_optimistic_updates",
+        "Number of queued light client optimistic updates which have expired before a matching block has been found."
+    );
+    pub static ref BEACON_PROCESSOR_REPROCESSING_QUEUE_MATCHED_OPTIMISTIC_UPDATES: Result<IntCounter> = try_create_int_counter(
+        "beacon_processor_reprocessing_queue_matched_optimistic_updates",
+        "Number of queued light client optimistic updates where as matching block has been imported."
+    );
+
+    /// Errors and Debugging Stats
+    pub static ref BEACON_PROCESSOR_SEND_ERROR_PER_WORK_TYPE: Result<IntCounterVec> =
+        try_create_int_counter_vec(
+            "beacon_processor_send_error_per_work_type",
+            "Total number of beacon processor send error per work type",
+            &["type"]
+        );
+}
diff --git a/beacon_node/network/src/beacon_processor/work_reprocessing_queue.rs b/beacon_node/beacon_processor/src/work_reprocessing_queue.rs
similarity index 85%
rename from beacon_node/network/src/beacon_processor/work_reprocessing_queue.rs
rename to beacon_node/beacon_processor/src/work_reprocessing_queue.rs
index 427be6d513..9191509d39 100644
--- a/beacon_node/network/src/beacon_processor/work_reprocessing_queue.rs
+++ b/beacon_node/beacon_processor/src/work_reprocessing_queue.rs
@@ -10,23 +10,18 @@
 //!
 //! Aggregated and unaggregated attestations that failed verification due to referencing an unknown
 //! block will be re-queued until their block is imported, or until they expire.
-use super::MAX_SCHEDULED_WORK_QUEUE_LEN;
-use crate::beacon_processor::{ChainSegmentProcessId, Work, WorkEvent};
 use crate::metrics;
-use crate::sync::manager::BlockProcessType;
-use beacon_chain::{BeaconChainTypes, GossipVerifiedBlock, MAXIMUM_GOSSIP_CLOCK_DISPARITY};
+use crate::{AsyncFn, BlockingFn, Work, WorkEvent};
 use fnv::FnvHashMap;
 use futures::task::Poll;
 use futures::{Stream, StreamExt};
 use itertools::Itertools;
-use lighthouse_network::{MessageId, PeerId};
 use logging::TimeLatch;
 use slog::{crit, debug, error, trace, warn, Logger};
 use slot_clock::SlotClock;
 use std::collections::{HashMap, HashSet};
 use std::future::Future;
 use std::pin::Pin;
-use std::sync::Arc;
 use std::task::Context;
 use std::time::Duration;
 use strum::AsRefStr;
@@ -34,10 +29,7 @@ use task_executor::TaskExecutor;
 use tokio::sync::mpsc::{self, Receiver, Sender};
 use tokio::time::error::Error as TimeError;
 use tokio_util::time::delay_queue::{DelayQueue, Key as DelayKey};
-use types::{
-    Attestation, EthSpec, Hash256, LightClientOptimisticUpdate, SignedAggregateAndProof,
-    SignedBeaconBlock, SubnetId,
-};
+use types::{EthSpec, Hash256, Slot};
 
 const TASK_NAME: &str = "beacon_processor_reprocess_queue";
 const GOSSIP_BLOCKS: &str = "gossip_blocks";
@@ -47,7 +39,7 @@ const LIGHT_CLIENT_UPDATES: &str = "lc_updates";
 
 /// Queue blocks for re-processing with an `ADDITIONAL_QUEUED_BLOCK_DELAY` after the slot starts.
 /// This is to account for any slight drift in the system clock.
-const ADDITIONAL_QUEUED_BLOCK_DELAY: Duration = Duration::from_millis(5);
+pub const ADDITIONAL_QUEUED_BLOCK_DELAY: Duration = Duration::from_millis(5);
 
 /// For how long to queue aggregated and unaggregated attestations for re-processing.
 pub const QUEUED_ATTESTATION_DELAY: Duration = Duration::from_secs(12);
@@ -84,12 +76,12 @@ pub const BACKFILL_SCHEDULE_IN_SLOT: [(u32, u32); 3] = [
 
 /// Messages that the scheduler can receive.
 #[derive(AsRefStr)]
-pub enum ReprocessQueueMessage<T: BeaconChainTypes> {
+pub enum ReprocessQueueMessage {
     /// A block that has been received early and we should queue for later processing.
-    EarlyBlock(QueuedGossipBlock<T>),
+    EarlyBlock(QueuedGossipBlock),
     /// A gossip block for hash `X` is being imported, we should queue the rpc block for the same
     /// hash until the gossip block is imported.
-    RpcBlock(QueuedRpcBlock<T::EthSpec>),
+    RpcBlock(QueuedRpcBlock),
     /// A block that was successfully processed. We use this to handle attestations and light client updates
     /// for unknown blocks.
     BlockImported {
@@ -97,139 +89,127 @@ pub enum ReprocessQueueMessage<T: BeaconChainTypes> {
         parent_root: Hash256,
     },
     /// An unaggregated attestation that references an unknown block.
-    UnknownBlockUnaggregate(QueuedUnaggregate<T::EthSpec>),
+    UnknownBlockUnaggregate(QueuedUnaggregate),
     /// An aggregated attestation that references an unknown block.
-    UnknownBlockAggregate(QueuedAggregate<T::EthSpec>),
+    UnknownBlockAggregate(QueuedAggregate),
     /// A light client optimistic update that references a parent root that has not been seen as a parent.
-    UnknownLightClientOptimisticUpdate(QueuedLightClientUpdate<T::EthSpec>),
+    UnknownLightClientOptimisticUpdate(QueuedLightClientUpdate),
     /// A new backfill batch that needs to be scheduled for processing.
-    BackfillSync(QueuedBackfillBatch<T::EthSpec>),
+    BackfillSync(QueuedBackfillBatch),
 }
 
 /// Events sent by the scheduler once they are ready for re-processing.
-pub enum ReadyWork<T: BeaconChainTypes> {
-    Block(QueuedGossipBlock<T>),
-    RpcBlock(QueuedRpcBlock<T::EthSpec>),
-    Unaggregate(QueuedUnaggregate<T::EthSpec>),
-    Aggregate(QueuedAggregate<T::EthSpec>),
-    LightClientUpdate(QueuedLightClientUpdate<T::EthSpec>),
-    BackfillSync(QueuedBackfillBatch<T::EthSpec>),
+pub enum ReadyWork {
+    Block(QueuedGossipBlock),
+    RpcBlock(QueuedRpcBlock),
+    IgnoredRpcBlock(IgnoredRpcBlock),
+    Unaggregate(QueuedUnaggregate),
+    Aggregate(QueuedAggregate),
+    LightClientUpdate(QueuedLightClientUpdate),
+    BackfillSync(QueuedBackfillBatch),
 }
 
 /// An Attestation for which the corresponding block was not seen while processing, queued for
 /// later.
-pub struct QueuedUnaggregate<T: EthSpec> {
-    pub peer_id: PeerId,
-    pub message_id: MessageId,
-    pub attestation: Box<Attestation<T>>,
-    pub subnet_id: SubnetId,
-    pub should_import: bool,
-    pub seen_timestamp: Duration,
+pub struct QueuedUnaggregate {
+    pub beacon_block_root: Hash256,
+    pub process_fn: BlockingFn,
 }
 
 /// An aggregated attestation for which the corresponding block was not seen while processing, queued for
 /// later.
-pub struct QueuedAggregate<T: EthSpec> {
-    pub peer_id: PeerId,
-    pub message_id: MessageId,
-    pub attestation: Box<SignedAggregateAndProof<T>>,
-    pub seen_timestamp: Duration,
+pub struct QueuedAggregate {
+    pub beacon_block_root: Hash256,
+    pub process_fn: BlockingFn,
 }
 
 /// A light client update for which the corresponding parent block was not seen while processing,
 /// queued for later.
-pub struct QueuedLightClientUpdate<T: EthSpec> {
-    pub peer_id: PeerId,
-    pub message_id: MessageId,
-    pub light_client_optimistic_update: Box<LightClientOptimisticUpdate<T>>,
+pub struct QueuedLightClientUpdate {
     pub parent_root: Hash256,
-    pub seen_timestamp: Duration,
+    pub process_fn: BlockingFn,
 }
 
 /// A block that arrived early and has been queued for later import.
-pub struct QueuedGossipBlock<T: BeaconChainTypes> {
-    pub peer_id: PeerId,
-    pub block: Box<GossipVerifiedBlock<T>>,
-    pub seen_timestamp: Duration,
+pub struct QueuedGossipBlock {
+    pub beacon_block_slot: Slot,
+    pub beacon_block_root: Hash256,
+    pub process_fn: AsyncFn,
 }
 
 /// A block that arrived for processing when the same block was being imported over gossip.
 /// It is queued for later import.
-pub struct QueuedRpcBlock<T: EthSpec> {
-    pub block_root: Hash256,
-    pub block: Arc<SignedBeaconBlock<T>>,
-    pub process_type: BlockProcessType,
-    pub seen_timestamp: Duration,
-    /// Indicates if the beacon chain should process this block or not.
-    /// We use this to ignore block processing when rpc block queues are full.
-    pub should_process: bool,
+pub struct QueuedRpcBlock {
+    pub beacon_block_root: Hash256,
+    /// Processes/imports the block.
+    pub process_fn: AsyncFn,
+    /// Ignores the block.
+    pub ignore_fn: BlockingFn,
+}
+
+/// A block that arrived for processing when the same block was being imported over gossip.
+/// It is queued for later import.
+pub struct IgnoredRpcBlock {
+    pub process_fn: BlockingFn,
 }
 
 /// A backfill batch work that has been queued for processing later.
-#[derive(Clone)]
-pub struct QueuedBackfillBatch<E: EthSpec> {
-    pub process_id: ChainSegmentProcessId,
-    pub blocks: Vec<Arc<SignedBeaconBlock<E>>>,
-}
+pub struct QueuedBackfillBatch(pub AsyncFn);
 
-impl<T: BeaconChainTypes> TryFrom<WorkEvent<T>> for QueuedBackfillBatch<T::EthSpec> {
+impl<T: EthSpec> TryFrom<WorkEvent<T>> for QueuedBackfillBatch {
     type Error = WorkEvent<T>;
 
     fn try_from(event: WorkEvent<T>) -> Result<Self, WorkEvent<T>> {
         match event {
             WorkEvent {
-                work:
-                    Work::ChainSegment {
-                        process_id: process_id @ ChainSegmentProcessId::BackSyncBatchId(_),
-                        blocks,
-                    },
+                work: Work::ChainSegmentBackfill(process_fn),
                 ..
-            } => Ok(QueuedBackfillBatch { process_id, blocks }),
+            } => Ok(QueuedBackfillBatch(process_fn)),
             _ => Err(event),
         }
     }
 }
 
-impl<T: BeaconChainTypes> From<QueuedBackfillBatch<T::EthSpec>> for WorkEvent<T> {
-    fn from(queued_backfill_batch: QueuedBackfillBatch<T::EthSpec>) -> WorkEvent<T> {
-        WorkEvent::chain_segment(
-            queued_backfill_batch.process_id,
-            queued_backfill_batch.blocks,
-        )
+impl<T: EthSpec> From<QueuedBackfillBatch> for WorkEvent<T> {
+    fn from(queued_backfill_batch: QueuedBackfillBatch) -> WorkEvent<T> {
+        WorkEvent {
+            drop_during_sync: false,
+            work: Work::ChainSegmentBackfill(queued_backfill_batch.0),
+        }
     }
 }
 
 /// Unifies the different messages processed by the block delay queue.
-enum InboundEvent<T: BeaconChainTypes> {
+enum InboundEvent {
     /// A gossip block that was queued for later processing and is ready for import.
-    ReadyGossipBlock(QueuedGossipBlock<T>),
+    ReadyGossipBlock(QueuedGossipBlock),
     /// A rpc block that was queued because the same gossip block was being imported
     /// will now be retried for import.
-    ReadyRpcBlock(QueuedRpcBlock<T::EthSpec>),
+    ReadyRpcBlock(QueuedRpcBlock),
     /// An aggregated or unaggregated attestation is ready for re-processing.
     ReadyAttestation(QueuedAttestationId),
     /// A light client update that is ready for re-processing.
     ReadyLightClientUpdate(QueuedLightClientUpdateId),
     /// A backfill batch that was queued is ready for processing.
-    ReadyBackfillSync(QueuedBackfillBatch<T::EthSpec>),
+    ReadyBackfillSync(QueuedBackfillBatch),
     /// A `DelayQueue` returned an error.
     DelayQueueError(TimeError, &'static str),
     /// A message sent to the `ReprocessQueue`
-    Msg(ReprocessQueueMessage<T>),
+    Msg(ReprocessQueueMessage),
 }
 
 /// Manages scheduling works that need to be later re-processed.
-struct ReprocessQueue<T: BeaconChainTypes> {
+struct ReprocessQueue<S> {
     /// Receiver of messages relevant to schedule works for reprocessing.
-    work_reprocessing_rx: Receiver<ReprocessQueueMessage<T>>,
+    work_reprocessing_rx: Receiver<ReprocessQueueMessage>,
     /// Sender of works once they become ready
-    ready_work_tx: Sender<ReadyWork<T>>,
+    ready_work_tx: Sender<ReadyWork>,
 
     /* Queues */
     /// Queue to manage scheduled early blocks.
-    gossip_block_delay_queue: DelayQueue<QueuedGossipBlock<T>>,
+    gossip_block_delay_queue: DelayQueue<QueuedGossipBlock>,
     /// Queue to manage scheduled early blocks.
-    rpc_block_delay_queue: DelayQueue<QueuedRpcBlock<T::EthSpec>>,
+    rpc_block_delay_queue: DelayQueue<QueuedRpcBlock>,
     /// Queue to manage scheduled attestations.
     attestations_delay_queue: DelayQueue<QueuedAttestationId>,
     /// Queue to manage scheduled light client updates.
@@ -239,17 +219,17 @@ struct ReprocessQueue<T: BeaconChainTypes> {
     /// Queued blocks.
     queued_gossip_block_roots: HashSet<Hash256>,
     /// Queued aggregated attestations.
-    queued_aggregates: FnvHashMap<usize, (QueuedAggregate<T::EthSpec>, DelayKey)>,
+    queued_aggregates: FnvHashMap<usize, (QueuedAggregate, DelayKey)>,
     /// Queued attestations.
-    queued_unaggregates: FnvHashMap<usize, (QueuedUnaggregate<T::EthSpec>, DelayKey)>,
+    queued_unaggregates: FnvHashMap<usize, (QueuedUnaggregate, DelayKey)>,
     /// Attestations (aggregated and unaggregated) per root.
     awaiting_attestations_per_root: HashMap<Hash256, Vec<QueuedAttestationId>>,
     /// Queued Light Client Updates.
-    queued_lc_updates: FnvHashMap<usize, (QueuedLightClientUpdate<T::EthSpec>, DelayKey)>,
+    queued_lc_updates: FnvHashMap<usize, (QueuedLightClientUpdate, DelayKey)>,
     /// Light Client Updates per parent_root.
     awaiting_lc_updates_per_parent_root: HashMap<Hash256, Vec<QueuedLightClientUpdateId>>,
     /// Queued backfill batches
-    queued_backfill_batches: Vec<QueuedBackfillBatch<T::EthSpec>>,
+    queued_backfill_batches: Vec<QueuedBackfillBatch>,
 
     /* Aux */
     /// Next attestation id, used for both aggregated and unaggregated attestations
@@ -260,7 +240,7 @@ struct ReprocessQueue<T: BeaconChainTypes> {
     attestation_delay_debounce: TimeLatch,
     lc_update_delay_debounce: TimeLatch,
     next_backfill_batch_event: Option<Pin<Box<tokio::time::Sleep>>>,
-    slot_clock: Pin<Box<T::SlotClock>>,
+    slot_clock: Pin<Box<S>>,
 }
 
 pub type QueuedLightClientUpdateId = usize;
@@ -271,20 +251,20 @@ enum QueuedAttestationId {
     Unaggregate(usize),
 }
 
-impl<T: EthSpec> QueuedAggregate<T> {
+impl QueuedAggregate {
     pub fn beacon_block_root(&self) -> &Hash256 {
-        &self.attestation.message.aggregate.data.beacon_block_root
+        &self.beacon_block_root
     }
 }
 
-impl<T: EthSpec> QueuedUnaggregate<T> {
+impl QueuedUnaggregate {
     pub fn beacon_block_root(&self) -> &Hash256 {
-        &self.attestation.data.beacon_block_root
+        &self.beacon_block_root
     }
 }
 
-impl<T: BeaconChainTypes> Stream for ReprocessQueue<T> {
-    type Item = InboundEvent<T>;
+impl<S: SlotClock> Stream for ReprocessQueue<S> {
+    type Item = InboundEvent;
 
     fn poll_next(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Option<Self::Item>> {
         // NOTE: implementing `Stream` is not necessary but allows to maintain the future selection
@@ -375,16 +355,18 @@ impl<T: BeaconChainTypes> Stream for ReprocessQueue<T> {
 /// Starts the job that manages scheduling works that need re-processing. The returned `Sender`
 /// gives the communicating channel to receive those works. Once a work is ready, it is sent back
 /// via `ready_work_tx`.
-pub fn spawn_reprocess_scheduler<T: BeaconChainTypes>(
-    ready_work_tx: Sender<ReadyWork<T>>,
+pub fn spawn_reprocess_scheduler<S: SlotClock + 'static>(
+    ready_work_tx: Sender<ReadyWork>,
+    work_reprocessing_rx: Receiver<ReprocessQueueMessage>,
     executor: &TaskExecutor,
-    slot_clock: T::SlotClock,
+    slot_clock: S,
     log: Logger,
-) -> Sender<ReprocessQueueMessage<T>> {
-    let (work_reprocessing_tx, work_reprocessing_rx) = mpsc::channel(MAX_SCHEDULED_WORK_QUEUE_LEN);
-    // Basic sanity check.
-    assert!(ADDITIONAL_QUEUED_BLOCK_DELAY < MAXIMUM_GOSSIP_CLOCK_DISPARITY);
-
+    maximum_gossip_clock_disparity: Duration,
+) -> Result<(), String> {
+    // Sanity check
+    if ADDITIONAL_QUEUED_BLOCK_DELAY >= maximum_gossip_clock_disparity {
+        return Err("The block delay and gossip disparity don't match.".to_string());
+    }
     let mut queue = ReprocessQueue {
         work_reprocessing_rx,
         ready_work_tx,
@@ -423,19 +405,18 @@ pub fn spawn_reprocess_scheduler<T: BeaconChainTypes>(
         },
         TASK_NAME,
     );
-
-    work_reprocessing_tx
+    Ok(())
 }
 
-impl<T: BeaconChainTypes> ReprocessQueue<T> {
-    fn handle_message(&mut self, msg: InboundEvent<T>, slot_clock: &T::SlotClock, log: &Logger) {
+impl<S: SlotClock> ReprocessQueue<S> {
+    fn handle_message(&mut self, msg: InboundEvent, slot_clock: &S, log: &Logger) {
         use ReprocessQueueMessage::*;
         match msg {
             // Some block has been indicated as "early" and should be processed when the
             // appropriate slot arrives.
             InboundEvent::Msg(EarlyBlock(early_block)) => {
-                let block_slot = early_block.block.block.slot();
-                let block_root = early_block.block.block_root;
+                let block_slot = early_block.beacon_block_slot;
+                let block_root = early_block.beacon_block_root;
 
                 // Don't add the same block to the queue twice. This prevents DoS attacks.
                 if self.queued_gossip_block_roots.contains(&block_root) {
@@ -494,7 +475,7 @@ impl<T: BeaconChainTypes> ReprocessQueue<T> {
             // for the same block hash is being imported. We wait for `QUEUED_RPC_BLOCK_DELAY`
             // and then send the rpc block back for processing assuming the gossip import
             // has completed by then.
-            InboundEvent::Msg(RpcBlock(mut rpc_block)) => {
+            InboundEvent::Msg(RpcBlock(rpc_block)) => {
                 // Check to ensure this won't over-fill the queue.
                 if self.rpc_block_delay_queue.len() >= MAXIMUM_QUEUED_BLOCKS {
                     if self.rpc_block_debounce.elapsed() {
@@ -507,10 +488,11 @@ impl<T: BeaconChainTypes> ReprocessQueue<T> {
                     }
                     // Return the block to the beacon processor signalling to
                     // ignore processing for this block
-                    rpc_block.should_process = false;
                     if self
                         .ready_work_tx
-                        .try_send(ReadyWork::RpcBlock(rpc_block))
+                        .try_send(ReadyWork::IgnoredRpcBlock(IgnoredRpcBlock {
+                            process_fn: rpc_block.ignore_fn,
+                        }))
                         .is_err()
                     {
                         error!(
@@ -529,7 +511,7 @@ impl<T: BeaconChainTypes> ReprocessQueue<T> {
                 debug!(
                     log,
                     "Sending rpc block for reprocessing";
-                    "block_root" => %queued_rpc_block.block.canonical_root()
+                    "block_root" => %queued_rpc_block.beacon_block_root
                 );
                 if self
                     .ready_work_tx
@@ -767,7 +749,7 @@ impl<T: BeaconChainTypes> ReprocessQueue<T> {
             }
             // A block that was queued for later processing is now ready to be processed.
             InboundEvent::ReadyGossipBlock(ready_block) => {
-                let block_root = ready_block.block.block_root;
+                let block_root = ready_block.beacon_block_root;
 
                 if !self.queued_gossip_block_roots.remove(&block_root) {
                     // Log an error to alert that we've made a bad assumption about how this
@@ -885,18 +867,28 @@ impl<T: BeaconChainTypes> ReprocessQueue<T> {
                     "millis_from_slot_start" => millis_from_slot_start
                 );
 
-                if self
+                match self
                     .ready_work_tx
-                    .try_send(ReadyWork::BackfillSync(queued_backfill_batch.clone()))
-                    .is_err()
+                    .try_send(ReadyWork::BackfillSync(queued_backfill_batch))
                 {
-                    error!(
+                    // The message was sent successfully.
+                    Ok(()) => (),
+                    // The message was not sent, recover it from the returned `Err`.
+                    Err(mpsc::error::TrySendError::Full(ReadyWork::BackfillSync(batch)))
+                    | Err(mpsc::error::TrySendError::Closed(ReadyWork::BackfillSync(batch))) => {
+                        error!(
+                            log,
+                            "Failed to send scheduled backfill work";
+                            "info" => "sending work back to queue"
+                        );
+                        self.queued_backfill_batches.insert(0, batch)
+                    }
+                    // The message was not sent and we didn't get the correct
+                    // return result. This is a logic error.
+                    _ => crit!(
                         log,
-                        "Failed to send scheduled backfill work";
-                        "info" => "sending work back to queue"
-                    );
-                    self.queued_backfill_batches
-                        .insert(0, queued_backfill_batch);
+                        "Unexpected return from try_send error";
+                    ),
                 }
             }
         }
@@ -927,7 +919,7 @@ impl<T: BeaconChainTypes> ReprocessQueue<T> {
         // only recompute the `next_backfill_batch_event` if there are backfill batches in the queue
         if !self.queued_backfill_batches.is_empty() {
             self.next_backfill_batch_event = Some(Box::pin(tokio::time::sleep(
-                ReprocessQueue::<T>::duration_until_next_backfill_batch_event(&self.slot_clock),
+                ReprocessQueue::<S>::duration_until_next_backfill_batch_event(&self.slot_clock),
             )));
         } else {
             self.next_backfill_batch_event = None
@@ -936,7 +928,7 @@ impl<T: BeaconChainTypes> ReprocessQueue<T> {
 
     /// Returns duration until the next scheduled processing time. The schedule ensure that backfill
     /// processing is done in windows of time that aren't critical
-    fn duration_until_next_backfill_batch_event(slot_clock: &T::SlotClock) -> Duration {
+    fn duration_until_next_backfill_batch_event(slot_clock: &S) -> Duration {
         let slot_duration = slot_clock.slot_duration();
         slot_clock
             .millis_from_current_slot_start()
@@ -966,16 +958,9 @@ impl<T: BeaconChainTypes> ReprocessQueue<T> {
 #[cfg(test)]
 mod tests {
     use super::*;
-    use beacon_chain::builder::Witness;
-    use beacon_chain::eth1_chain::CachingEth1Backend;
     use slot_clock::TestingSlotClock;
-    use store::MemoryStore;
-    use types::MainnetEthSpec as E;
     use types::Slot;
 
-    type TestBeaconChainType =
-        Witness<TestingSlotClock, CachingEth1Backend<E>, E, MemoryStore<E>, MemoryStore<E>>;
-
     #[test]
     fn backfill_processing_schedule_calculation() {
         let slot_duration = Duration::from_secs(12);
@@ -988,7 +973,7 @@ mod tests {
 
         for &event_duration_from_slot_start in event_times.iter() {
             let duration_to_next_event =
-                ReprocessQueue::<TestBeaconChainType>::duration_until_next_backfill_batch_event(
+                ReprocessQueue::<TestingSlotClock>::duration_until_next_backfill_batch_event(
                     &slot_clock,
                 );
 
@@ -1005,7 +990,7 @@ mod tests {
         // check for next event beyond the current slot
         let duration_to_next_slot = slot_clock.duration_to_next_slot().unwrap();
         let duration_to_next_event =
-            ReprocessQueue::<TestBeaconChainType>::duration_until_next_backfill_batch_event(
+            ReprocessQueue::<TestingSlotClock>::duration_until_next_backfill_batch_event(
                 &slot_clock,
             );
         assert_eq!(
diff --git a/beacon_node/client/Cargo.toml b/beacon_node/client/Cargo.toml
index 64c79ea668..87e1650902 100644
--- a/beacon_node/client/Cargo.toml
+++ b/beacon_node/client/Cargo.toml
@@ -6,11 +6,11 @@ edition = "2021"
 
 [dev-dependencies]
 serde_yaml = "0.8.13"
-state_processing = { path = "../../consensus/state_processing" }
 operation_pool = { path = "../operation_pool" }
 tokio = "1.14.0"
 
 [dependencies]
+state_processing = { path = "../../consensus/state_processing" }
 beacon_chain = { path = "../beacon_chain" }
 store = { path = "../store" }
 network = { path = "../network" }
@@ -43,3 +43,4 @@ slasher = { path = "../../slasher" }
 slasher_service = { path = "../../slasher/service" }
 monitoring_api = {path = "../../common/monitoring_api"}
 execution_layer = { path = "../execution_layer" }
+beacon_processor =  { path = "../beacon_processor" }
diff --git a/beacon_node/client/src/builder.rs b/beacon_node/client/src/builder.rs
index e05b92a277..07990e3c1f 100644
--- a/beacon_node/client/src/builder.rs
+++ b/beacon_node/client/src/builder.rs
@@ -11,8 +11,10 @@ use beacon_chain::{
     slot_clock::{SlotClock, SystemTimeSlotClock},
     state_advance_timer::spawn_state_advance_timer,
     store::{HotColdDB, ItemStore, LevelDB, StoreConfig},
-    BeaconChain, BeaconChainTypes, Eth1ChainBackend, ServerSentEventHandler,
+    BeaconChain, BeaconChainTypes, Eth1ChainBackend, MigratorConfig, ServerSentEventHandler,
 };
+use beacon_processor::BeaconProcessorConfig;
+use beacon_processor::{BeaconProcessor, BeaconProcessorChannels};
 use environment::RuntimeContext;
 use eth1::{Config as Eth1Config, Service as Eth1Service};
 use eth2::{
@@ -71,6 +73,8 @@ pub struct ClientBuilder<T: BeaconChainTypes> {
     http_api_config: http_api::Config,
     http_metrics_config: http_metrics::Config,
     slasher: Option<Arc<Slasher<T::EthSpec>>>,
+    beacon_processor_config: Option<BeaconProcessorConfig>,
+    beacon_processor_channels: Option<BeaconProcessorChannels<T::EthSpec>>,
     eth_spec_instance: T::EthSpec,
 }
 
@@ -104,6 +108,8 @@ where
             http_metrics_config: <_>::default(),
             slasher: None,
             eth_spec_instance,
+            beacon_processor_config: None,
+            beacon_processor_channels: None,
         }
     }
 
@@ -119,6 +125,12 @@ where
         self
     }
 
+    pub fn beacon_processor(mut self, config: BeaconProcessorConfig) -> Self {
+        self.beacon_processor_channels = Some(BeaconProcessorChannels::new(&config));
+        self.beacon_processor_config = Some(config);
+        self
+    }
+
     pub fn slasher(mut self, slasher: Arc<Slasher<TEthSpec>>) -> Self {
         self.slasher = Some(slasher);
         self
@@ -142,14 +154,18 @@ where
         let runtime_context =
             runtime_context.ok_or("beacon_chain_start_method requires a runtime context")?;
         let context = runtime_context.service_context("beacon".into());
+        let log = context.log();
         let spec = chain_spec.ok_or("beacon_chain_start_method requires a chain spec")?;
         let event_handler = if self.http_api_config.enabled {
-            Some(ServerSentEventHandler::new(context.log().clone()))
+            Some(ServerSentEventHandler::new(
+                context.log().clone(),
+                self.http_api_config.sse_capacity_multiplier,
+            ))
         } else {
             None
         };
 
-        let execution_layer = if let Some(config) = config.execution_layer {
+        let execution_layer = if let Some(config) = config.execution_layer.clone() {
             let context = runtime_context.service_context("exec".into());
             let execution_layer = ExecutionLayer::from_config(
                 config,
@@ -167,6 +183,9 @@ where
             .store(store)
             .task_executor(context.executor.clone())
             .custom_spec(spec.clone())
+            .store_migrator_config(
+                MigratorConfig::default().epochs_per_migration(chain_config.epochs_per_migration),
+            )
             .chain_config(chain_config)
             .graffiti(graffiti)
             .event_handler(event_handler)
@@ -231,23 +250,19 @@ where
                 )?;
                 builder.genesis_state(genesis_state).map(|v| (v, None))?
             }
-            ClientGenesis::SszBytes {
-                genesis_state_bytes,
-            } => {
+            ClientGenesis::GenesisState => {
                 info!(
                     context.log(),
                     "Starting from known genesis state";
                 );
 
-                let genesis_state = BeaconState::from_ssz_bytes(&genesis_state_bytes, &spec)
-                    .map_err(|e| format!("Unable to parse genesis state SSZ: {:?}", e))?;
+                let genesis_state = genesis_state(&runtime_context, &config, log)?;
 
                 builder.genesis_state(genesis_state).map(|v| (v, None))?
             }
             ClientGenesis::WeakSubjSszBytes {
                 anchor_state_bytes,
                 anchor_block_bytes,
-                genesis_state_bytes,
             } => {
                 info!(context.log(), "Starting checkpoint sync");
                 if config.chain.genesis_backfill {
@@ -261,17 +276,13 @@ where
                     .map_err(|e| format!("Unable to parse weak subj state SSZ: {:?}", e))?;
                 let anchor_block = SignedBeaconBlock::from_ssz_bytes(&anchor_block_bytes, &spec)
                     .map_err(|e| format!("Unable to parse weak subj block SSZ: {:?}", e))?;
-                let genesis_state = BeaconState::from_ssz_bytes(&genesis_state_bytes, &spec)
-                    .map_err(|e| format!("Unable to parse genesis state SSZ: {:?}", e))?;
+                let genesis_state = genesis_state(&runtime_context, &config, log)?;
 
                 builder
                     .weak_subjectivity_state(anchor_state, anchor_block, genesis_state)
                     .map(|v| (v, None))?
             }
-            ClientGenesis::CheckpointSyncUrl {
-                genesis_state_bytes,
-                url,
-            } => {
+            ClientGenesis::CheckpointSyncUrl { url } => {
                 info!(
                     context.log(),
                     "Starting checkpoint sync";
@@ -290,7 +301,6 @@ where
                         config.chain.checkpoint_sync_url_timeout,
                     )),
                 );
-                let slots_per_epoch = TEthSpec::slots_per_epoch();
 
                 let deposit_snapshot = if config.sync_eth1_chain {
                     // We want to fetch deposit snapshot before fetching the finalized beacon state to
@@ -337,10 +347,23 @@ where
                     None
                 };
 
-                debug!(context.log(), "Downloading finalized block");
-                // Find a suitable finalized block on an epoch boundary.
-                let mut block = remote
-                    .get_beacon_blocks_ssz::<TEthSpec>(BlockId::Finalized, &spec)
+                debug!(
+                    context.log(),
+                    "Downloading finalized state";
+                );
+                let state = remote
+                    .get_debug_beacon_states_ssz::<TEthSpec>(StateId::Finalized, &spec)
+                    .await
+                    .map_err(|e| format!("Error loading checkpoint state from remote: {:?}", e))?
+                    .ok_or_else(|| "Checkpoint state missing from remote".to_string())?;
+
+                debug!(context.log(), "Downloaded finalized state"; "slot" => ?state.slot());
+
+                let finalized_block_slot = state.latest_block_header().slot;
+
+                debug!(context.log(), "Downloading finalized block"; "block_slot" => ?finalized_block_slot);
+                let block = remote
+                    .get_beacon_blocks_ssz::<TEthSpec>(BlockId::Slot(finalized_block_slot), &spec)
                     .await
                     .map_err(|e| match e {
                         ApiError::InvalidSsz(e) => format!(
@@ -354,65 +377,14 @@ where
 
                 debug!(context.log(), "Downloaded finalized block");
 
-                let mut block_slot = block.slot();
-
-                while block.slot() % slots_per_epoch != 0 {
-                    block_slot = (block_slot / slots_per_epoch - 1) * slots_per_epoch;
-
-                    debug!(
-                        context.log(),
-                        "Searching for aligned checkpoint block";
-                        "block_slot" => block_slot
-                    );
-
-                    if let Some(found_block) = remote
-                        .get_beacon_blocks_ssz::<TEthSpec>(BlockId::Slot(block_slot), &spec)
-                        .await
-                        .map_err(|e| {
-                            format!("Error fetching block at slot {}: {:?}", block_slot, e)
-                        })?
-                    {
-                        block = found_block;
-                    }
-                }
-
-                debug!(
-                    context.log(),
-                    "Downloaded aligned finalized block";
-                    "block_root" => ?block.canonical_root(),
-                    "block_slot" => block.slot(),
-                );
-
-                let state_root = block.state_root();
-                debug!(
-                    context.log(),
-                    "Downloading finalized state";
-                    "state_root" => ?state_root
-                );
-                let state = remote
-                    .get_debug_beacon_states_ssz::<TEthSpec>(StateId::Root(state_root), &spec)
-                    .await
-                    .map_err(|e| {
-                        format!(
-                            "Error loading checkpoint state from remote {:?}: {:?}",
-                            state_root, e
-                        )
-                    })?
-                    .ok_or_else(|| {
-                        format!("Checkpoint state missing from remote: {:?}", state_root)
-                    })?;
-
-                debug!(context.log(), "Downloaded finalized state");
-
-                let genesis_state = BeaconState::from_ssz_bytes(&genesis_state_bytes, &spec)
-                    .map_err(|e| format!("Unable to parse genesis state SSZ: {:?}", e))?;
+                let genesis_state = genesis_state(&runtime_context, &config, log)?;
 
                 info!(
                     context.log(),
                     "Loaded checkpoint block and state";
-                    "slot" => block.slot(),
+                    "block_slot" => block.slot(),
+                    "state_slot" => state.slot(),
                     "block_root" => ?block.canonical_root(),
-                    "state_root" => ?state_root,
                 );
 
                 let service =
@@ -476,6 +448,7 @@ where
                         chain: None,
                         network_senders: None,
                         network_globals: None,
+                        beacon_processor_send: None,
                         eth1_service: Some(genesis_service.eth1_service.clone()),
                         log: context.log().clone(),
                         sse_logging_components: runtime_context.sse_logging_components.clone(),
@@ -553,6 +526,10 @@ where
             .as_ref()
             .ok_or("network requires a runtime_context")?
             .clone();
+        let beacon_processor_channels = self
+            .beacon_processor_channels
+            .as_ref()
+            .ok_or("network requires beacon_processor_channels")?;
 
         // If gossipsub metrics are required we build a registry to record them
         let mut gossipsub_registry = if config.metrics_enabled {
@@ -568,6 +545,8 @@ where
             gossipsub_registry
                 .as_mut()
                 .map(|registry| registry.sub_registry_with_prefix("gossipsub")),
+            beacon_processor_channels.beacon_processor_tx.clone(),
+            beacon_processor_channels.work_reprocessing_tx.clone(),
         )
         .await
         .map_err(|e| format!("Failed to start network: {:?}", e))?;
@@ -690,6 +669,14 @@ where
             .runtime_context
             .as_ref()
             .ok_or("build requires a runtime context")?;
+        let beacon_processor_channels = self
+            .beacon_processor_channels
+            .take()
+            .ok_or("build requires beacon_processor_channels")?;
+        let beacon_processor_config = self
+            .beacon_processor_config
+            .take()
+            .ok_or("build requires a beacon_processor_config")?;
         let log = runtime_context.log().clone();
 
         let http_api_listen_addr = if self.http_api_config.enabled {
@@ -699,6 +686,7 @@ where
                 network_senders: self.network_senders.clone(),
                 network_globals: self.network_globals.clone(),
                 eth1_service: self.eth1_service.clone(),
+                beacon_processor_send: Some(beacon_processor_channels.beacon_processor_tx.clone()),
                 sse_logging_components: runtime_context.sse_logging_components.clone(),
                 log: log.clone(),
             });
@@ -755,6 +743,25 @@ where
         }
 
         if let Some(beacon_chain) = self.beacon_chain.as_ref() {
+            if let Some(network_globals) = &self.network_globals {
+                let beacon_processor_context = runtime_context.service_context("bproc".into());
+                BeaconProcessor {
+                    network_globals: network_globals.clone(),
+                    executor: beacon_processor_context.executor.clone(),
+                    current_workers: 0,
+                    config: beacon_processor_config,
+                    log: beacon_processor_context.log().clone(),
+                }
+                .spawn_manager(
+                    beacon_processor_channels.beacon_processor_rx,
+                    beacon_processor_channels.work_reprocessing_tx,
+                    beacon_processor_channels.work_reprocessing_rx,
+                    None,
+                    beacon_chain.slot_clock.clone(),
+                    beacon_chain.spec.maximum_gossip_clock_disparity(),
+                )?;
+            }
+
             let state_advance_context = runtime_context.service_context("state_advance".into());
             let state_advance_log = state_advance_context.log().clone();
             spawn_state_advance_timer(
@@ -807,9 +814,6 @@ where
                     execution_layer.spawn_clean_proposer_caches_routine::<TSlotClock>(
                         beacon_chain.slot_clock.clone(),
                     );
-
-                    // Spawns a routine that polls the `exchange_transition_configuration` endpoint.
-                    execution_layer.spawn_transition_configuration_poll(beacon_chain.spec.clone());
                 }
 
                 // Spawn a service to publish BLS to execution changes at the Capella fork.
@@ -1077,3 +1081,22 @@ where
         Ok(self)
     }
 }
+
+/// Obtain the genesis state from the `eth2_network_config` in `context`.
+fn genesis_state<T: EthSpec>(
+    context: &RuntimeContext<T>,
+    config: &ClientConfig,
+    log: &Logger,
+) -> Result<BeaconState<T>, String> {
+    let eth2_network_config = context
+        .eth2_network_config
+        .as_ref()
+        .ok_or("An eth2_network_config is required to obtain the genesis state")?;
+    eth2_network_config
+        .genesis_state::<T>(
+            config.genesis_state_url.as_deref(),
+            config.genesis_state_url_timeout,
+            log,
+        )?
+        .ok_or_else(|| "Genesis state is unknown".to_string())
+}
diff --git a/beacon_node/client/src/config.rs b/beacon_node/client/src/config.rs
index 95a00b3749..adaf027984 100644
--- a/beacon_node/client/src/config.rs
+++ b/beacon_node/client/src/config.rs
@@ -1,4 +1,5 @@
 use beacon_chain::validator_monitor::DEFAULT_INDIVIDUAL_TRACKING_THRESHOLD;
+use beacon_processor::BeaconProcessorConfig;
 use directory::DEFAULT_ROOT_DIR;
 use environment::LoggerConfig;
 use network::NetworkConfig;
@@ -6,6 +7,7 @@ use sensitive_url::SensitiveUrl;
 use serde_derive::{Deserialize, Serialize};
 use std::fs;
 use std::path::PathBuf;
+use std::time::Duration;
 use types::{Graffiti, PublicKeyBytes};
 /// Default directory name for the freezer database under the top-level data dir.
 const DEFAULT_FREEZER_DB_DIR: &str = "freezer_db";
@@ -24,18 +26,13 @@ pub enum ClientGenesis {
     /// contract.
     #[default]
     DepositContract,
-    /// Loads the genesis state from SSZ-encoded `BeaconState` bytes.
-    ///
-    /// We include the bytes instead of the `BeaconState<E>` because the `EthSpec` type
-    /// parameter would be very annoying.
-    SszBytes { genesis_state_bytes: Vec<u8> },
+    /// Loads the genesis state from the genesis state in the `Eth2NetworkConfig`.
+    GenesisState,
     WeakSubjSszBytes {
-        genesis_state_bytes: Vec<u8>,
         anchor_state_bytes: Vec<u8>,
         anchor_block_bytes: Vec<u8>,
     },
     CheckpointSyncUrl {
-        genesis_state_bytes: Vec<u8>,
         url: SensitiveUrl,
     },
 }
@@ -79,7 +76,9 @@ pub struct Config {
     pub monitoring_api: Option<monitoring_api::Config>,
     pub slasher: Option<slasher::Config>,
     pub logger_config: LoggerConfig,
-    pub always_prefer_builder_payload: bool,
+    pub beacon_processor: BeaconProcessorConfig,
+    pub genesis_state_url: Option<String>,
+    pub genesis_state_url_timeout: Duration,
 }
 
 impl Default for Config {
@@ -106,7 +105,10 @@ impl Default for Config {
             validator_monitor_pubkeys: vec![],
             validator_monitor_individual_tracking_threshold: DEFAULT_INDIVIDUAL_TRACKING_THRESHOLD,
             logger_config: LoggerConfig::default(),
-            always_prefer_builder_payload: false,
+            beacon_processor: <_>::default(),
+            genesis_state_url: <_>::default(),
+            // This default value should always be overwritten by the CLI default value.
+            genesis_state_url_timeout: Duration::from_secs(60),
         }
     }
 }
diff --git a/beacon_node/client/src/notifier.rs b/beacon_node/client/src/notifier.rs
index 1ff469fe30..7d81594ee6 100644
--- a/beacon_node/client/src/notifier.rs
+++ b/beacon_node/client/src/notifier.rs
@@ -404,14 +404,6 @@ async fn merge_readiness_logging<T: BeaconChainTypes>(
                 "config" => ?other
             ),
         },
-        readiness @ MergeReadiness::ExchangeTransitionConfigurationFailed { error: _ } => {
-            error!(
-                log,
-                "Not ready for merge";
-                "info" => %readiness,
-                "hint" => "try updating Lighthouse and/or the execution layer",
-            )
-        }
         readiness @ MergeReadiness::NotSynced => warn!(
             log,
             "Not ready for merge";
diff --git a/beacon_node/execution_layer/Cargo.toml b/beacon_node/execution_layer/Cargo.toml
index 2cb28346f5..f2259a4813 100644
--- a/beacon_node/execution_layer/Cargo.toml
+++ b/beacon_node/execution_layer/Cargo.toml
@@ -41,13 +41,13 @@ lazy_static = "1.4.0"
 ethers-core = "1.0.2"
 builder_client = { path = "../builder_client" }
 fork_choice = { path = "../../consensus/fork_choice" }
-mev-rs = { git = "https://github.com/ralexstokes/mev-rs" }
-ethereum-consensus = { git = "https://github.com/ralexstokes/ethereum-consensus" }
-ssz-rs = { git = "https://github.com/ralexstokes/ssz-rs" }
+mev-rs = { git = "https://github.com/ralexstokes/mev-rs", rev = "216657016d5c0889b505857c89ae42c7aa2764af" }
+ethereum-consensus = { git = "https://github.com/ralexstokes/ethereum-consensus", rev = "e380108" }
+ssz_rs = "0.9.0"
 tokio-stream = { version = "0.1.9", features = [ "sync" ] }
 strum = "0.24.0"
 keccak-hash = "0.10.0"
 hash256-std-hasher = "0.15.2"
 triehash = "0.8.4"
 hash-db = "0.15.2"
-pretty_reqwest_error = { path = "../../common/pretty_reqwest_error" }
\ No newline at end of file
+pretty_reqwest_error = { path = "../../common/pretty_reqwest_error" }
diff --git a/beacon_node/execution_layer/src/engine_api.rs b/beacon_node/execution_layer/src/engine_api.rs
index 826294d5ff..359dcb5223 100644
--- a/beacon_node/execution_layer/src/engine_api.rs
+++ b/beacon_node/execution_layer/src/engine_api.rs
@@ -1,9 +1,8 @@
 use crate::engines::ForkchoiceState;
 use crate::http::{
-    ENGINE_EXCHANGE_TRANSITION_CONFIGURATION_V1, ENGINE_FORKCHOICE_UPDATED_V1,
-    ENGINE_FORKCHOICE_UPDATED_V2, ENGINE_GET_PAYLOAD_BODIES_BY_HASH_V1,
-    ENGINE_GET_PAYLOAD_BODIES_BY_RANGE_V1, ENGINE_GET_PAYLOAD_V1, ENGINE_GET_PAYLOAD_V2,
-    ENGINE_NEW_PAYLOAD_V1, ENGINE_NEW_PAYLOAD_V2,
+    ENGINE_FORKCHOICE_UPDATED_V1, ENGINE_FORKCHOICE_UPDATED_V2,
+    ENGINE_GET_PAYLOAD_BODIES_BY_HASH_V1, ENGINE_GET_PAYLOAD_BODIES_BY_RANGE_V1,
+    ENGINE_GET_PAYLOAD_V1, ENGINE_GET_PAYLOAD_V2, ENGINE_NEW_PAYLOAD_V1, ENGINE_NEW_PAYLOAD_V2,
 };
 use eth2::types::{SsePayloadAttributes, SsePayloadAttributesV1, SsePayloadAttributesV2};
 pub use ethers_core::types::Transaction;
@@ -450,7 +449,6 @@ pub struct EngineCapabilities {
     pub get_payload_bodies_by_range_v1: bool,
     pub get_payload_v1: bool,
     pub get_payload_v2: bool,
-    pub exchange_transition_configuration_v1: bool,
 }
 
 impl EngineCapabilities {
@@ -480,9 +478,6 @@ impl EngineCapabilities {
         if self.get_payload_v2 {
             response.push(ENGINE_GET_PAYLOAD_V2);
         }
-        if self.exchange_transition_configuration_v1 {
-            response.push(ENGINE_EXCHANGE_TRANSITION_CONFIGURATION_V1);
-        }
 
         response
     }
diff --git a/beacon_node/execution_layer/src/engine_api/http.rs b/beacon_node/execution_layer/src/engine_api/http.rs
index 029866d95b..0ce03e6029 100644
--- a/beacon_node/execution_layer/src/engine_api/http.rs
+++ b/beacon_node/execution_layer/src/engine_api/http.rs
@@ -46,10 +46,6 @@ pub const ENGINE_GET_PAYLOAD_BODIES_BY_HASH_V1: &str = "engine_getPayloadBodiesB
 pub const ENGINE_GET_PAYLOAD_BODIES_BY_RANGE_V1: &str = "engine_getPayloadBodiesByRangeV1";
 pub const ENGINE_GET_PAYLOAD_BODIES_TIMEOUT: Duration = Duration::from_secs(10);
 
-pub const ENGINE_EXCHANGE_TRANSITION_CONFIGURATION_V1: &str =
-    "engine_exchangeTransitionConfigurationV1";
-pub const ENGINE_EXCHANGE_TRANSITION_CONFIGURATION_V1_TIMEOUT: Duration = Duration::from_secs(1);
-
 pub const ENGINE_EXCHANGE_CAPABILITIES: &str = "engine_exchangeCapabilities";
 pub const ENGINE_EXCHANGE_CAPABILITIES_TIMEOUT: Duration = Duration::from_secs(1);
 
@@ -68,7 +64,6 @@ pub static LIGHTHOUSE_CAPABILITIES: &[&str] = &[
     ENGINE_FORKCHOICE_UPDATED_V2,
     ENGINE_GET_PAYLOAD_BODIES_BY_HASH_V1,
     ENGINE_GET_PAYLOAD_BODIES_BY_RANGE_V1,
-    ENGINE_EXCHANGE_TRANSITION_CONFIGURATION_V1,
 ];
 
 /// This is necessary because a user might run a capella-enabled version of
@@ -83,7 +78,6 @@ pub static PRE_CAPELLA_ENGINE_CAPABILITIES: EngineCapabilities = EngineCapabilit
     get_payload_bodies_by_range_v1: false,
     get_payload_v1: true,
     get_payload_v2: false,
-    exchange_transition_configuration_v1: true,
 };
 
 /// Contains methods to convert arbitrary bytes to an ETH2 deposit contract object.
@@ -934,24 +928,6 @@ impl HttpJsonRpc {
             .collect())
     }
 
-    pub async fn exchange_transition_configuration_v1(
-        &self,
-        transition_configuration: TransitionConfigurationV1,
-    ) -> Result<TransitionConfigurationV1, Error> {
-        let params = json!([transition_configuration]);
-
-        let response = self
-            .rpc_request(
-                ENGINE_EXCHANGE_TRANSITION_CONFIGURATION_V1,
-                params,
-                ENGINE_EXCHANGE_TRANSITION_CONFIGURATION_V1_TIMEOUT
-                    * self.execution_timeout_multiplier,
-            )
-            .await?;
-
-        Ok(response)
-    }
-
     pub async fn exchange_capabilities(&self) -> Result<EngineCapabilities, Error> {
         let params = json!([LIGHTHOUSE_CAPABILITIES]);
 
@@ -982,8 +958,6 @@ impl HttpJsonRpc {
                     .contains(ENGINE_GET_PAYLOAD_BODIES_BY_RANGE_V1),
                 get_payload_v1: capabilities.contains(ENGINE_GET_PAYLOAD_V1),
                 get_payload_v2: capabilities.contains(ENGINE_GET_PAYLOAD_V2),
-                exchange_transition_configuration_v1: capabilities
-                    .contains(ENGINE_EXCHANGE_TRANSITION_CONFIGURATION_V1),
             }),
         }
     }
diff --git a/beacon_node/execution_layer/src/lib.rs b/beacon_node/execution_layer/src/lib.rs
index 0e9df7a50d..b57bba7518 100644
--- a/beacon_node/execution_layer/src/lib.rs
+++ b/beacon_node/execution_layer/src/lib.rs
@@ -38,11 +38,11 @@ use tokio::{
 };
 use tokio_stream::wrappers::WatchStream;
 use tree_hash::TreeHash;
-use types::{AbstractExecPayload, BeaconStateError, ExecPayload, Withdrawals};
+use types::{AbstractExecPayload, BeaconStateError, ExecPayload};
 use types::{
-    BlindedPayload, BlockType, ChainSpec, Epoch, ExecutionBlockHash, ExecutionPayload,
-    ExecutionPayloadCapella, ExecutionPayloadMerge, ForkName, ForkVersionedResponse,
-    ProposerPreparationData, PublicKeyBytes, Signature, SignedBeaconBlock, Slot, Uint256,
+    BlindedPayload, BlockType, ChainSpec, Epoch, ExecutionPayloadCapella, ExecutionPayloadMerge,
+    ForkVersionedResponse, ProposerPreparationData, PublicKeyBytes, Signature, SignedBeaconBlock,
+    Slot,
 };
 
 mod block_hash;
@@ -74,11 +74,9 @@ const EXECUTION_BLOCKS_LRU_CACHE_SIZE: usize = 128;
 const DEFAULT_SUGGESTED_FEE_RECIPIENT: [u8; 20] =
     [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1];
 
-const CONFIG_POLL_INTERVAL: Duration = Duration::from_secs(60);
-
 /// A payload alongside some information about where it came from.
 pub enum ProvenancedPayload<P> {
-    /// A good ol' fashioned farm-to-table payload from your local EE.
+    /// A good old fashioned farm-to-table payload from your local EE.
     Local(P),
     /// A payload from a builder (e.g. mev-boost).
     Builder(P),
@@ -163,7 +161,7 @@ impl<T: EthSpec, Payload: AbstractExecPayload<T>> BlockProposalContents<T, Paylo
                 BlockProposalContents::Payload {
                     payload: Payload::default_at_fork(fork_name)?,
                     block_value: Uint256::zero(),
-                    _phantom: PhantomData::default(),
+                    _phantom: PhantomData,
                 }
             }
         })
@@ -502,24 +500,6 @@ impl<T: EthSpec> ExecutionLayer<T> {
         self.spawn(preparation_cleaner, "exec_preparation_cleanup");
     }
 
-    /// Spawns a routine that polls the `exchange_transition_configuration` endpoint.
-    pub fn spawn_transition_configuration_poll(&self, spec: ChainSpec) {
-        let routine = |el: ExecutionLayer<T>| async move {
-            loop {
-                if let Err(e) = el.exchange_transition_configuration(&spec).await {
-                    error!(
-                        el.log(),
-                        "Failed to check transition config";
-                        "error" => ?e
-                    );
-                }
-                sleep(CONFIG_POLL_INTERVAL).await;
-            }
-        };
-
-        self.spawn(routine, "exec_config_poll");
-    }
-
     /// Returns `true` if the execution engine is synced and reachable.
     pub async fn is_synced(&self) -> bool {
         self.engine().is_synced().await
@@ -858,7 +838,7 @@ impl<T: EthSpec> ExecutionLayer<T> {
                                     BlockProposalContents::Payload {
                                         payload: relay.data.message.header,
                                         block_value: relay.data.message.value,
-                                        _phantom: PhantomData::default(),
+                                        _phantom: PhantomData,
                                     },
                                 )),
                                 Err(reason) if !reason.payload_invalid() => {
@@ -913,7 +893,7 @@ impl<T: EthSpec> ExecutionLayer<T> {
                                     BlockProposalContents::Payload {
                                         payload: relay.data.message.header,
                                         block_value: relay.data.message.value,
-                                        _phantom: PhantomData::default(),
+                                        _phantom: PhantomData,
                                     },
                                 )),
                                 // If the payload is valid then use it. The local EE failed
@@ -922,7 +902,7 @@ impl<T: EthSpec> ExecutionLayer<T> {
                                     BlockProposalContents::Payload {
                                         payload: relay.data.message.header,
                                         block_value: relay.data.message.value,
-                                        _phantom: PhantomData::default(),
+                                        _phantom: PhantomData,
                                     },
                                 )),
                                 Err(reason) => {
@@ -1129,7 +1109,7 @@ impl<T: EthSpec> ExecutionLayer<T> {
                 Ok(BlockProposalContents::Payload {
                     payload: execution_payload.into(),
                     block_value,
-                    _phantom: PhantomData::default(),
+                    _phantom: PhantomData,
                 })
             })
             .await
@@ -1318,53 +1298,6 @@ impl<T: EthSpec> ExecutionLayer<T> {
         .map_err(Error::EngineError)
     }
 
-    pub async fn exchange_transition_configuration(&self, spec: &ChainSpec) -> Result<(), Error> {
-        let local = TransitionConfigurationV1 {
-            terminal_total_difficulty: spec.terminal_total_difficulty,
-            terminal_block_hash: spec.terminal_block_hash,
-            terminal_block_number: 0,
-        };
-
-        let result = self
-            .engine()
-            .request(|engine| engine.api.exchange_transition_configuration_v1(local))
-            .await;
-
-        match result {
-            Ok(remote) => {
-                if local.terminal_total_difficulty != remote.terminal_total_difficulty
-                    || local.terminal_block_hash != remote.terminal_block_hash
-                {
-                    error!(
-                        self.log(),
-                        "Execution client config mismatch";
-                        "msg" => "ensure lighthouse and the execution client are up-to-date and \
-                                  configured consistently",
-                        "remote" => ?remote,
-                        "local" => ?local,
-                    );
-                    Err(Error::EngineError(Box::new(EngineError::Api {
-                        error: ApiError::TransitionConfigurationMismatch,
-                    })))
-                } else {
-                    debug!(
-                        self.log(),
-                        "Execution client config is OK";
-                    );
-                    Ok(())
-                }
-            }
-            Err(e) => {
-                error!(
-                    self.log(),
-                    "Unable to get transition config";
-                    "error" => ?e,
-                );
-                Err(Error::EngineError(Box::new(e)))
-            }
-        }
-    }
-
     /// Returns the execution engine capabilities resulting from a call to
     /// engine_exchangeCapabilities. If the capabilities cache is not populated,
     /// or if it is populated with a cached result of age >= `age_limit`, this
@@ -2018,6 +1951,22 @@ async fn timed_future<F: Future<Output = T>, T>(metric: &str, future: F) -> (T,
     (result, duration)
 }
 
+fn noop<T: EthSpec>(
+    _: &ExecutionLayer<T>,
+    _: ExecutionPayloadRef<T>,
+) -> Option<ExecutionPayload<T>> {
+    None
+}
+
+#[cfg(test)]
+/// Returns the duration since the unix epoch.
+fn timestamp_now() -> u64 {
+    SystemTime::now()
+        .duration_since(UNIX_EPOCH)
+        .unwrap_or_else(|_| Duration::from_secs(0))
+        .as_secs()
+}
+
 #[cfg(test)]
 mod test {
     use super::*;
@@ -2164,19 +2113,3 @@ mod test {
             .await;
     }
 }
-
-fn noop<T: EthSpec>(
-    _: &ExecutionLayer<T>,
-    _: ExecutionPayloadRef<T>,
-) -> Option<ExecutionPayload<T>> {
-    None
-}
-
-#[cfg(test)]
-/// Returns the duration since the unix epoch.
-fn timestamp_now() -> u64 {
-    SystemTime::now()
-        .duration_since(UNIX_EPOCH)
-        .unwrap_or_else(|_| Duration::from_secs(0))
-        .as_secs()
-}
diff --git a/beacon_node/execution_layer/src/test_utils/handle_rpc.rs b/beacon_node/execution_layer/src/test_utils/handle_rpc.rs
index 79468b2116..62cab5ad28 100644
--- a/beacon_node/execution_layer/src/test_utils/handle_rpc.rs
+++ b/beacon_node/execution_layer/src/test_utils/handle_rpc.rs
@@ -357,15 +357,6 @@ pub async fn handle_rpc<T: EthSpec>(
 
             Ok(serde_json::to_value(response).unwrap())
         }
-        ENGINE_EXCHANGE_TRANSITION_CONFIGURATION_V1 => {
-            let block_generator = ctx.execution_block_generator.read();
-            let transition_config: TransitionConfigurationV1 = TransitionConfigurationV1 {
-                terminal_total_difficulty: block_generator.terminal_total_difficulty,
-                terminal_block_hash: block_generator.terminal_block_hash,
-                terminal_block_number: block_generator.terminal_block_number,
-            };
-            Ok(serde_json::to_value(transition_config).unwrap())
-        }
         ENGINE_EXCHANGE_CAPABILITIES => {
             let engine_capabilities = ctx.engine_capabilities.read();
             Ok(serde_json::to_value(engine_capabilities.to_response()).unwrap())
diff --git a/beacon_node/execution_layer/src/test_utils/mock_builder.rs b/beacon_node/execution_layer/src/test_utils/mock_builder.rs
index 668d1fb3b1..9471be636d 100644
--- a/beacon_node/execution_layer/src/test_utils/mock_builder.rs
+++ b/beacon_node/execution_layer/src/test_utils/mock_builder.rs
@@ -11,11 +11,17 @@ use ethereum_consensus::{
 };
 use fork_choice::ForkchoiceUpdateParameters;
 use mev_rs::{
-    bellatrix::{BuilderBid as BuilderBidBellatrix, SignedBuilderBid as SignedBuilderBidBellatrix},
-    capella::{BuilderBid as BuilderBidCapella, SignedBuilderBid as SignedBuilderBidCapella},
-    sign_builder_message, verify_signed_builder_message, BidRequest, BlindedBlockProviderError,
-    BlindedBlockProviderServer, BuilderBid, ExecutionPayload as ServerPayload,
-    SignedBlindedBeaconBlock, SignedBuilderBid, SignedValidatorRegistration,
+    blinded_block_provider::Server as BlindedBlockProviderServer,
+    signing::{sign_builder_message, verify_signed_builder_message},
+    types::{
+        bellatrix::{
+            BuilderBid as BuilderBidBellatrix, SignedBuilderBid as SignedBuilderBidBellatrix,
+        },
+        capella::{BuilderBid as BuilderBidCapella, SignedBuilderBid as SignedBuilderBidCapella},
+        BidRequest, BuilderBid, ExecutionPayload as ServerPayload, SignedBlindedBeaconBlock,
+        SignedBuilderBid, SignedValidatorRegistration,
+    },
+    Error as MevError,
 };
 use parking_lot::RwLock;
 use sensitive_url::SensitiveUrl;
@@ -47,7 +53,7 @@ pub enum Operation {
 }
 
 impl Operation {
-    fn apply<B: BidStuff>(self, bid: &mut B) -> Result<(), BlindedBlockProviderError> {
+    fn apply<B: BidStuff>(self, bid: &mut B) -> Result<(), MevError> {
         match self {
             Operation::FeeRecipient(fee_recipient) => {
                 *bid.fee_recipient_mut() = to_ssz_rs(&fee_recipient)?
@@ -73,7 +79,7 @@ pub trait BidStuff {
     fn prev_randao_mut(&mut self) -> &mut Hash32;
     fn block_number_mut(&mut self) -> &mut u64;
     fn timestamp_mut(&mut self) -> &mut u64;
-    fn withdrawals_root_mut(&mut self) -> Result<&mut Root, BlindedBlockProviderError>;
+    fn withdrawals_root_mut(&mut self) -> Result<&mut Root, MevError>;
 
     fn sign_builder_message(
         &mut self,
@@ -134,11 +140,9 @@ impl BidStuff for BuilderBid {
         }
     }
 
-    fn withdrawals_root_mut(&mut self) -> Result<&mut Root, BlindedBlockProviderError> {
+    fn withdrawals_root_mut(&mut self) -> Result<&mut Root, MevError> {
         match self {
-            Self::Bellatrix(_) => Err(BlindedBlockProviderError::Custom(
-                "withdrawals_root called on bellatrix bid".to_string(),
-            )),
+            Self::Bellatrix(_) => Err(MevError::InvalidFork),
             Self::Capella(bid) => Ok(&mut bid.header.withdrawals_root),
         }
     }
@@ -274,7 +278,7 @@ impl<E: EthSpec> MockBuilder<E> {
         *self.invalidate_signatures.write() = false;
     }
 
-    fn apply_operations<B: BidStuff>(&self, bid: &mut B) -> Result<(), BlindedBlockProviderError> {
+    fn apply_operations<B: BidStuff>(&self, bid: &mut B) -> Result<(), MevError> {
         let mut guard = self.operations.write();
         while let Some(op) = guard.pop() {
             op.apply(bid)?;
@@ -288,7 +292,7 @@ impl<E: EthSpec> mev_rs::BlindedBlockProvider for MockBuilder<E> {
     async fn register_validators(
         &self,
         registrations: &mut [SignedValidatorRegistration],
-    ) -> Result<(), BlindedBlockProviderError> {
+    ) -> Result<(), MevError> {
         for registration in registrations {
             let pubkey = registration.message.public_key.clone();
             let message = &mut registration.message;
@@ -307,10 +311,7 @@ impl<E: EthSpec> mev_rs::BlindedBlockProvider for MockBuilder<E> {
         Ok(())
     }
 
-    async fn fetch_best_bid(
-        &self,
-        bid_request: &BidRequest,
-    ) -> Result<SignedBuilderBid, BlindedBlockProviderError> {
+    async fn fetch_best_bid(&self, bid_request: &BidRequest) -> Result<SignedBuilderBid, MevError> {
         let slot = Slot::new(bid_request.slot);
         let fork = self.spec.fork_name_at_slot::<E>(slot);
         let signed_cached_data = self
@@ -336,7 +337,7 @@ impl<E: EthSpec> mev_rs::BlindedBlockProvider for MockBuilder<E> {
             .map_err(convert_err)?
             .block_hash();
         if head_execution_hash != from_ssz_rs(&bid_request.parent_hash)? {
-            return Err(BlindedBlockProviderError::Custom(format!(
+            return Err(custom_err(format!(
                 "head mismatch: {} {}",
                 head_execution_hash, bid_request.parent_hash
             )));
@@ -396,7 +397,7 @@ impl<E: EthSpec> mev_rs::BlindedBlockProvider for MockBuilder<E> {
             .get_debug_beacon_states(StateId::Head)
             .await
             .map_err(convert_err)?
-            .ok_or_else(|| BlindedBlockProviderError::Custom("missing head state".to_string()))?
+            .ok_or_else(|| custom_err("missing head state".to_string()))?
             .data;
         let prev_randao = head_state
             .get_randao_mix(head_state.current_epoch())
@@ -409,10 +410,7 @@ impl<E: EthSpec> mev_rs::BlindedBlockProvider for MockBuilder<E> {
                 PayloadAttributes::new(timestamp, *prev_randao, fee_recipient, Some(vec![]))
             }
             ForkName::Base | ForkName::Altair => {
-                return Err(BlindedBlockProviderError::Custom(format!(
-                    "Unsupported fork: {}",
-                    fork
-                )));
+                return Err(MevError::InvalidFork);
             }
         };
 
@@ -452,12 +450,7 @@ impl<E: EthSpec> mev_rs::BlindedBlockProvider for MockBuilder<E> {
                 value: to_ssz_rs(&Uint256::from(DEFAULT_BUILDER_PAYLOAD_VALUE_WEI))?,
                 public_key: self.builder_sk.public_key(),
             }),
-            ForkName::Base | ForkName::Altair => {
-                return Err(BlindedBlockProviderError::Custom(format!(
-                    "Unsupported fork: {}",
-                    fork
-                )))
-            }
+            ForkName::Base | ForkName::Altair => return Err(MevError::InvalidFork),
         };
         *message.gas_limit_mut() = cached_data.gas_limit;
 
@@ -475,7 +468,7 @@ impl<E: EthSpec> mev_rs::BlindedBlockProvider for MockBuilder<E> {
     async fn open_bid(
         &self,
         signed_block: &mut SignedBlindedBeaconBlock,
-    ) -> Result<ServerPayload, BlindedBlockProviderError> {
+    ) -> Result<ServerPayload, MevError> {
         let node = match signed_block {
             SignedBlindedBeaconBlock::Bellatrix(block) => {
                 block.message.body.execution_payload_header.hash_tree_root()
@@ -496,9 +489,7 @@ impl<E: EthSpec> mev_rs::BlindedBlockProvider for MockBuilder<E> {
     }
 }
 
-pub fn from_ssz_rs<T: SimpleSerialize, U: Decode>(
-    ssz_rs_data: &T,
-) -> Result<U, BlindedBlockProviderError> {
+pub fn from_ssz_rs<T: SimpleSerialize, U: Decode>(ssz_rs_data: &T) -> Result<U, MevError> {
     U::from_ssz_bytes(
         ssz_rs::serialize(ssz_rs_data)
             .map_err(convert_err)?
@@ -507,12 +498,17 @@ pub fn from_ssz_rs<T: SimpleSerialize, U: Decode>(
     .map_err(convert_err)
 }
 
-pub fn to_ssz_rs<T: Encode, U: SimpleSerialize>(
-    ssz_data: &T,
-) -> Result<U, BlindedBlockProviderError> {
+pub fn to_ssz_rs<T: Encode, U: SimpleSerialize>(ssz_data: &T) -> Result<U, MevError> {
     ssz_rs::deserialize::<U>(&ssz_data.as_ssz_bytes()).map_err(convert_err)
 }
 
-fn convert_err<E: Debug>(e: E) -> BlindedBlockProviderError {
-    BlindedBlockProviderError::Custom(format!("{e:?}"))
+fn convert_err<E: Debug>(e: E) -> MevError {
+    custom_err(format!("{e:?}"))
+}
+
+// This is a bit of a hack since the `Custom` variant was removed from `mev_rs::Error`.
+fn custom_err(s: String) -> MevError {
+    MevError::Consensus(ethereum_consensus::state_transition::Error::Io(
+        std::io::Error::new(std::io::ErrorKind::Other, s),
+    ))
 }
diff --git a/beacon_node/execution_layer/src/test_utils/mod.rs b/beacon_node/execution_layer/src/test_utils/mod.rs
index a8e7bab270..99d264aa7b 100644
--- a/beacon_node/execution_layer/src/test_utils/mod.rs
+++ b/beacon_node/execution_layer/src/test_utils/mod.rs
@@ -43,7 +43,6 @@ pub const DEFAULT_ENGINE_CAPABILITIES: EngineCapabilities = EngineCapabilities {
     get_payload_bodies_by_range_v1: true,
     get_payload_v1: true,
     get_payload_v2: true,
-    exchange_transition_configuration_v1: true,
 };
 
 mod execution_block_generator;
diff --git a/beacon_node/genesis/src/common.rs b/beacon_node/genesis/src/common.rs
index 06bf99f9f6..e48fa36204 100644
--- a/beacon_node/genesis/src/common.rs
+++ b/beacon_node/genesis/src/common.rs
@@ -39,7 +39,7 @@ pub fn genesis_deposits(
 
     Ok(deposit_data
         .into_iter()
-        .zip(proofs.into_iter())
+        .zip(proofs)
         .map(|(data, proof)| (data, proof.into()))
         .map(|(data, proof)| Deposit { proof, data })
         .collect())
diff --git a/beacon_node/http_api/Cargo.toml b/beacon_node/http_api/Cargo.toml
index 2b117b26ce..0fa286f165 100644
--- a/beacon_node/http_api/Cargo.toml
+++ b/beacon_node/http_api/Cargo.toml
@@ -3,12 +3,12 @@ name = "http_api"
 version = "0.1.0"
 authors = ["Paul Hauner <paul@paulhauner.com>"]
 edition = "2021"
-autotests = false # using a single test binary compiles faster
+autotests = false                               # using a single test binary compiles faster
 
 [dependencies]
 warp = { version = "0.3.2", features = ["tls"] }
 serde = { version = "1.0.116", features = ["derive"] }
-tokio = { version = "1.14.0", features = ["macros","sync"] }
+tokio = { version = "1.14.0", features = ["macros", "sync"] }
 tokio-stream = { version = "0.1.3", features = ["sync"] }
 types = { path = "../../consensus/types" }
 hex = "0.4.2"
@@ -27,9 +27,9 @@ slot_clock = { path = "../../common/slot_clock" }
 ethereum_ssz = "0.5.0"
 bs58 = "0.4.0"
 futures = "0.3.8"
-execution_layer = {path = "../execution_layer"}
+execution_layer = { path = "../execution_layer" }
 parking_lot = "0.12.0"
-safe_arith = {path = "../../consensus/safe_arith"}
+safe_arith = { path = "../../consensus/safe_arith" }
 task_executor = { path = "../../common/task_executor" }
 lru = "0.7.7"
 tree_hash = "0.5.0"
@@ -40,8 +40,10 @@ logging = { path = "../../common/logging" }
 ethereum_serde_utils = "0.5.0"
 operation_pool = { path = "../operation_pool" }
 sensitive_url = { path = "../../common/sensitive_url" }
-unused_port = {path = "../../common/unused_port"}
+unused_port = { path = "../../common/unused_port" }
 store = { path = "../store" }
+bytes = "1.1.0"
+beacon_processor = { path = "../beacon_processor" }
 
 [dev-dependencies]
 environment = { path = "../../lighthouse/environment" }
@@ -51,4 +53,4 @@ genesis = { path = "../genesis" }
 
 [[test]]
 name = "bn_http_api_tests"
-path = "tests/main.rs"
\ No newline at end of file
+path = "tests/main.rs"
diff --git a/beacon_node/http_api/src/attester_duties.rs b/beacon_node/http_api/src/attester_duties.rs
index 5c3e420839..f3242a2b37 100644
--- a/beacon_node/http_api/src/attester_duties.rs
+++ b/beacon_node/http_api/src/attester_duties.rs
@@ -1,9 +1,7 @@
 //! Contains the handler for the `GET validator/duties/attester/{epoch}` endpoint.
 
 use crate::state_id::StateId;
-use beacon_chain::{
-    BeaconChain, BeaconChainError, BeaconChainTypes, MAXIMUM_GOSSIP_CLOCK_DISPARITY,
-};
+use beacon_chain::{BeaconChain, BeaconChainError, BeaconChainTypes};
 use eth2::types::{self as api_types};
 use slot_clock::SlotClock;
 use state_processing::state_advance::partial_state_advance;
@@ -32,12 +30,11 @@ pub fn attester_duties<T: BeaconChainTypes>(
     // will equal `current_epoch + 1`
     let tolerant_current_epoch = chain
         .slot_clock
-        .now_with_future_tolerance(MAXIMUM_GOSSIP_CLOCK_DISPARITY)
+        .now_with_future_tolerance(chain.spec.maximum_gossip_clock_disparity())
         .ok_or_else(|| warp_utils::reject::custom_server_error("unable to read slot clock".into()))?
         .epoch(T::EthSpec::slots_per_epoch());
 
     if request_epoch == current_epoch
-        || request_epoch == tolerant_current_epoch
         || request_epoch == current_epoch + 1
         || request_epoch == tolerant_current_epoch + 1
     {
@@ -48,7 +45,7 @@ pub fn attester_duties<T: BeaconChainTypes>(
             request_epoch, current_epoch
         )))
     } else {
-        // request_epoch < current_epoch
+        // request_epoch < current_epoch, in fact we only allow `request_epoch == current_epoch-1` in this case
         compute_historic_attester_duties(request_epoch, request_indices, chain)
     }
 }
diff --git a/beacon_node/http_api/src/block_packing_efficiency.rs b/beacon_node/http_api/src/block_packing_efficiency.rs
index 1b924f3828..e099e130a8 100644
--- a/beacon_node/http_api/src/block_packing_efficiency.rs
+++ b/beacon_node/http_api/src/block_packing_efficiency.rs
@@ -75,7 +75,7 @@ impl<T: EthSpec> PackingEfficiencyHandler<T> {
             available_attestations: HashSet::new(),
             included_attestations: HashMap::new(),
             committee_store: CommitteeStore::new(),
-            _phantom: PhantomData::default(),
+            _phantom: PhantomData,
         };
 
         handler.compute_epoch(start_epoch, &starting_state, spec)?;
diff --git a/beacon_node/http_api/src/builder_states.rs b/beacon_node/http_api/src/builder_states.rs
new file mode 100644
index 0000000000..90203f2d60
--- /dev/null
+++ b/beacon_node/http_api/src/builder_states.rs
@@ -0,0 +1,72 @@
+use crate::StateId;
+use beacon_chain::{BeaconChain, BeaconChainTypes};
+use safe_arith::SafeArith;
+use state_processing::per_block_processing::get_expected_withdrawals;
+use state_processing::state_advance::partial_state_advance;
+use std::sync::Arc;
+use types::{BeaconState, EthSpec, ForkName, Slot, Withdrawals};
+
+const MAX_EPOCH_LOOKAHEAD: u64 = 2;
+
+/// Get the withdrawals computed from the specified state, that will be included in the block
+/// that gets built on the specified state.
+pub fn get_next_withdrawals<T: BeaconChainTypes>(
+    chain: &Arc<BeaconChain<T>>,
+    mut state: BeaconState<T::EthSpec>,
+    state_id: StateId,
+    proposal_slot: Slot,
+) -> Result<Withdrawals<T::EthSpec>, warp::Rejection> {
+    get_next_withdrawals_sanity_checks(chain, &state, proposal_slot)?;
+
+    // advance the state to the epoch of the proposal slot.
+    let proposal_epoch = proposal_slot.epoch(T::EthSpec::slots_per_epoch());
+    let (state_root, _, _) = state_id.root(chain)?;
+    if proposal_epoch != state.current_epoch() {
+        if let Err(e) =
+            partial_state_advance(&mut state, Some(state_root), proposal_slot, &chain.spec)
+        {
+            return Err(warp_utils::reject::custom_server_error(format!(
+                "failed to advance to the epoch of the proposal slot: {:?}",
+                e
+            )));
+        }
+    }
+
+    match get_expected_withdrawals(&state, &chain.spec) {
+        Ok(withdrawals) => Ok(withdrawals),
+        Err(e) => Err(warp_utils::reject::custom_server_error(format!(
+            "failed to get expected withdrawal: {:?}",
+            e
+        ))),
+    }
+}
+
+fn get_next_withdrawals_sanity_checks<T: BeaconChainTypes>(
+    chain: &BeaconChain<T>,
+    state: &BeaconState<T::EthSpec>,
+    proposal_slot: Slot,
+) -> Result<(), warp::Rejection> {
+    if proposal_slot <= state.slot() {
+        return Err(warp_utils::reject::custom_bad_request(
+            "proposal slot must be greater than the pre-state slot".to_string(),
+        ));
+    }
+
+    let fork = chain.spec.fork_name_at_slot::<T::EthSpec>(proposal_slot);
+    if let ForkName::Base | ForkName::Altair | ForkName::Merge = fork {
+        return Err(warp_utils::reject::custom_bad_request(
+            "the specified state is a pre-capella state.".to_string(),
+        ));
+    }
+
+    let look_ahead_limit = MAX_EPOCH_LOOKAHEAD
+        .safe_mul(T::EthSpec::slots_per_epoch())
+        .map_err(warp_utils::reject::arith_error)?;
+    if proposal_slot >= state.slot() + look_ahead_limit {
+        return Err(warp_utils::reject::custom_bad_request(format!(
+            "proposal slot is greater than or equal to the look ahead limit: {look_ahead_limit}"
+        )));
+    }
+
+    Ok(())
+}
diff --git a/beacon_node/http_api/src/lib.rs b/beacon_node/http_api/src/lib.rs
index 27bcc4d8a1..19d62c060d 100644
--- a/beacon_node/http_api/src/lib.rs
+++ b/beacon_node/http_api/src/lib.rs
@@ -10,6 +10,7 @@ mod attester_duties;
 mod block_id;
 mod block_packing_efficiency;
 mod block_rewards;
+mod builder_states;
 mod database;
 mod metrics;
 mod proposer_duties;
@@ -18,8 +19,10 @@ mod standard_block_rewards;
 mod state_id;
 mod sync_committee_rewards;
 mod sync_committees;
+mod task_spawner;
 pub mod test_utils;
 mod ui;
+mod validator;
 mod validator_inclusion;
 mod version;
 
@@ -28,7 +31,10 @@ use beacon_chain::{
     validator_monitor::timestamp_now, AttestationError as AttnError, BeaconChain, BeaconChainError,
     BeaconChainTypes, ProduceBlockVerification, WhenSlotSkipped,
 };
+use beacon_processor::BeaconProcessorSend;
 pub use block_id::BlockId;
+use builder_states::get_next_withdrawals;
+use bytes::Bytes;
 use directory::DEFAULT_ROOT_DIR;
 use eth2::types::{
     self as api_types, BroadcastValidation, EndpointVersion, ForkChoice, ForkChoiceNode,
@@ -56,8 +62,15 @@ use std::pin::Pin;
 use std::sync::Arc;
 use sysinfo::{System, SystemExt};
 use system_health::observe_system_health_bn;
-use tokio::sync::mpsc::{Sender, UnboundedSender};
-use tokio_stream::{wrappers::BroadcastStream, StreamExt};
+use task_spawner::{Priority, TaskSpawner};
+use tokio::sync::{
+    mpsc::{Sender, UnboundedSender},
+    oneshot,
+};
+use tokio_stream::{
+    wrappers::{errors::BroadcastStreamRecvError, BroadcastStream},
+    StreamExt,
+};
 use types::{
     Attestation, AttestationData, AttestationShufflingId, AttesterSlashing, BeaconStateError,
     BlindedPayload, CommitteeCache, ConfigAndPreset, Epoch, EthSpec, ForkName, FullPayload,
@@ -66,6 +79,7 @@ use types::{
     SignedContributionAndProof, SignedValidatorRegistrationData, SignedVoluntaryExit, Slot,
     SyncCommitteeMessage, SyncContributionData,
 };
+use validator::pubkey_to_validator_index;
 use version::{
     add_consensus_version_header, execution_optimistic_finalized_fork_versioned_response,
     fork_versioned_response, inconsistent_fork_rejection, unsupported_version_rejection, V1, V2,
@@ -74,11 +88,7 @@ use warp::http::StatusCode;
 use warp::sse::Event;
 use warp::Reply;
 use warp::{http::Response, Filter};
-use warp_utils::{
-    query::multi_key_query,
-    task::{blocking_json_task, blocking_response_task},
-    uor::UnifyingOrFilter,
-};
+use warp_utils::{query::multi_key_query, uor::UnifyingOrFilter};
 
 const API_PREFIX: &str = "eth";
 
@@ -110,6 +120,7 @@ pub struct Context<T: BeaconChainTypes> {
     pub chain: Option<Arc<BeaconChain<T>>>,
     pub network_senders: Option<NetworkSenders<T::EthSpec>>,
     pub network_globals: Option<Arc<NetworkGlobals<T::EthSpec>>>,
+    pub beacon_processor_send: Option<BeaconProcessorSend<T::EthSpec>>,
     pub eth1_service: Option<eth1::Service>,
     pub sse_logging_components: Option<SSELoggingComponents>,
     pub log: Logger,
@@ -126,6 +137,10 @@ pub struct Config {
     pub allow_sync_stalled: bool,
     pub spec_fork_name: Option<ForkName>,
     pub data_dir: PathBuf,
+    pub sse_capacity_multiplier: usize,
+    pub enable_beacon_processor: bool,
+    #[serde(with = "eth2::types::serde_status_code")]
+    pub duplicate_block_status_code: StatusCode,
 }
 
 impl Default for Config {
@@ -139,6 +154,9 @@ impl Default for Config {
             allow_sync_stalled: false,
             spec_fork_name: None,
             data_dir: PathBuf::from(DEFAULT_ROOT_DIR),
+            sse_capacity_multiplier: 1,
+            enable_beacon_processor: true,
+            duplicate_block_status_code: StatusCode::ACCEPTED,
         }
     }
 }
@@ -487,6 +505,16 @@ pub fn serve<T: BeaconChainTypes>(
     let app_start = std::time::Instant::now();
     let app_start_filter = warp::any().map(move || app_start);
 
+    // Create a `warp` filter that provides access to the `TaskSpawner`.
+    let beacon_processor_send = ctx
+        .beacon_processor_send
+        .clone()
+        .filter(|_| config.enable_beacon_processor);
+    let task_spawner_filter =
+        warp::any().map(move || TaskSpawner::new(beacon_processor_send.clone()));
+
+    let duplicate_block_status_code = ctx.config.duplicate_block_status_code;
+
     /*
      *
      * Start of HTTP method definitions.
@@ -498,17 +526,20 @@ pub fn serve<T: BeaconChainTypes>(
         .and(warp::path("beacon"))
         .and(warp::path("genesis"))
         .and(warp::path::end())
+        .and(task_spawner_filter.clone())
         .and(chain_filter.clone())
-        .and_then(|chain: Arc<BeaconChain<T>>| {
-            blocking_json_task(move || {
-                let genesis_data = api_types::GenesisData {
-                    genesis_time: chain.genesis_time,
-                    genesis_validators_root: chain.genesis_validators_root,
-                    genesis_fork_version: chain.spec.genesis_fork_version,
-                };
-                Ok(api_types::GenericResponse::from(genesis_data))
-            })
-        });
+        .then(
+            |task_spawner: TaskSpawner<T::EthSpec>, chain: Arc<BeaconChain<T>>| {
+                task_spawner.blocking_json_task(Priority::P1, move || {
+                    let genesis_data = api_types::GenesisData {
+                        genesis_time: chain.genesis_time,
+                        genesis_validators_root: chain.genesis_validators_root,
+                        genesis_fork_version: chain.spec.genesis_fork_version,
+                    };
+                    Ok(api_types::GenericResponse::from(genesis_data))
+                })
+            },
+        );
 
     /*
      * beacon/states/{state_id}
@@ -522,6 +553,7 @@ pub fn serve<T: BeaconChainTypes>(
                 "Invalid state ID".to_string(),
             ))
         }))
+        .and(task_spawner_filter.clone())
         .and(chain_filter.clone());
 
     // GET beacon/states/{state_id}/root
@@ -529,65 +561,77 @@ pub fn serve<T: BeaconChainTypes>(
         .clone()
         .and(warp::path("root"))
         .and(warp::path::end())
-        .and_then(|state_id: StateId, chain: Arc<BeaconChain<T>>| {
-            blocking_json_task(move || {
-                let (root, execution_optimistic, finalized) = state_id.root(&chain)?;
-                Ok(root)
-                    .map(api_types::RootData::from)
-                    .map(api_types::GenericResponse::from)
-                    .map(|resp| {
-                        resp.add_execution_optimistic_finalized(execution_optimistic, finalized)
-                    })
-            })
-        });
+        .then(
+            |state_id: StateId,
+             task_spawner: TaskSpawner<T::EthSpec>,
+             chain: Arc<BeaconChain<T>>| {
+                task_spawner.blocking_json_task(Priority::P1, move || {
+                    let (root, execution_optimistic, finalized) = state_id.root(&chain)?;
+                    Ok(root)
+                        .map(api_types::RootData::from)
+                        .map(api_types::GenericResponse::from)
+                        .map(|resp| {
+                            resp.add_execution_optimistic_finalized(execution_optimistic, finalized)
+                        })
+                })
+            },
+        );
 
     // GET beacon/states/{state_id}/fork
     let get_beacon_state_fork = beacon_states_path
         .clone()
         .and(warp::path("fork"))
         .and(warp::path::end())
-        .and_then(|state_id: StateId, chain: Arc<BeaconChain<T>>| {
-            blocking_json_task(move || {
-                let (fork, execution_optimistic, finalized) =
-                    state_id.fork_and_execution_optimistic_and_finalized(&chain)?;
-                Ok(api_types::ExecutionOptimisticFinalizedResponse {
-                    data: fork,
-                    execution_optimistic: Some(execution_optimistic),
-                    finalized: Some(finalized),
+        .then(
+            |state_id: StateId,
+             task_spawner: TaskSpawner<T::EthSpec>,
+             chain: Arc<BeaconChain<T>>| {
+                task_spawner.blocking_json_task(Priority::P1, move || {
+                    let (fork, execution_optimistic, finalized) =
+                        state_id.fork_and_execution_optimistic_and_finalized(&chain)?;
+                    Ok(api_types::ExecutionOptimisticFinalizedResponse {
+                        data: fork,
+                        execution_optimistic: Some(execution_optimistic),
+                        finalized: Some(finalized),
+                    })
                 })
-            })
-        });
+            },
+        );
 
     // GET beacon/states/{state_id}/finality_checkpoints
     let get_beacon_state_finality_checkpoints = beacon_states_path
         .clone()
         .and(warp::path("finality_checkpoints"))
         .and(warp::path::end())
-        .and_then(|state_id: StateId, chain: Arc<BeaconChain<T>>| {
-            blocking_json_task(move || {
-                let (data, execution_optimistic, finalized) = state_id
-                    .map_state_and_execution_optimistic_and_finalized(
-                        &chain,
-                        |state, execution_optimistic, finalized| {
-                            Ok((
-                                api_types::FinalityCheckpointsData {
-                                    previous_justified: state.previous_justified_checkpoint(),
-                                    current_justified: state.current_justified_checkpoint(),
-                                    finalized: state.finalized_checkpoint(),
-                                },
-                                execution_optimistic,
-                                finalized,
-                            ))
-                        },
-                    )?;
+        .then(
+            |state_id: StateId,
+             task_spawner: TaskSpawner<T::EthSpec>,
+             chain: Arc<BeaconChain<T>>| {
+                task_spawner.blocking_json_task(Priority::P1, move || {
+                    let (data, execution_optimistic, finalized) = state_id
+                        .map_state_and_execution_optimistic_and_finalized(
+                            &chain,
+                            |state, execution_optimistic, finalized| {
+                                Ok((
+                                    api_types::FinalityCheckpointsData {
+                                        previous_justified: state.previous_justified_checkpoint(),
+                                        current_justified: state.current_justified_checkpoint(),
+                                        finalized: state.finalized_checkpoint(),
+                                    },
+                                    execution_optimistic,
+                                    finalized,
+                                ))
+                            },
+                        )?;
 
-                Ok(api_types::ExecutionOptimisticFinalizedResponse {
-                    data,
-                    execution_optimistic: Some(execution_optimistic),
-                    finalized: Some(finalized),
+                    Ok(api_types::ExecutionOptimisticFinalizedResponse {
+                        data,
+                        execution_optimistic: Some(execution_optimistic),
+                        finalized: Some(finalized),
+                    })
                 })
-            })
-        });
+            },
+        );
 
     // GET beacon/states/{state_id}/validator_balances?id
     let get_beacon_state_validator_balances = beacon_states_path
@@ -595,11 +639,12 @@ pub fn serve<T: BeaconChainTypes>(
         .and(warp::path("validator_balances"))
         .and(warp::path::end())
         .and(multi_key_query::<api_types::ValidatorBalancesQuery>())
-        .and_then(
+        .then(
             |state_id: StateId,
+             task_spawner: TaskSpawner<T::EthSpec>,
              chain: Arc<BeaconChain<T>>,
              query_res: Result<api_types::ValidatorBalancesQuery, warp::Rejection>| {
-                blocking_json_task(move || {
+                task_spawner.blocking_json_task(Priority::P1, move || {
                     let query = query_res?;
                     let (data, execution_optimistic, finalized) = state_id
                         .map_state_and_execution_optimistic_and_finalized(
@@ -652,11 +697,12 @@ pub fn serve<T: BeaconChainTypes>(
         .and(warp::path("validators"))
         .and(warp::path::end())
         .and(multi_key_query::<api_types::ValidatorsQuery>())
-        .and_then(
+        .then(
             |state_id: StateId,
+             task_spawner: TaskSpawner<T::EthSpec>,
              chain: Arc<BeaconChain<T>>,
              query_res: Result<api_types::ValidatorsQuery, warp::Rejection>| {
-                blocking_json_task(move || {
+                task_spawner.blocking_json_task(Priority::P1, move || {
                     let query = query_res?;
                     let (data, execution_optimistic, finalized) = state_id
                         .map_state_and_execution_optimistic_and_finalized(
@@ -735,17 +781,25 @@ pub fn serve<T: BeaconChainTypes>(
             ))
         }))
         .and(warp::path::end())
-        .and_then(
-            |state_id: StateId, chain: Arc<BeaconChain<T>>, validator_id: ValidatorId| {
-                blocking_json_task(move || {
+        .then(
+            |state_id: StateId,
+             task_spawner: TaskSpawner<T::EthSpec>,
+             chain: Arc<BeaconChain<T>>,
+             validator_id: ValidatorId| {
+                task_spawner.blocking_json_task(Priority::P1, move || {
                     let (data, execution_optimistic, finalized) = state_id
                         .map_state_and_execution_optimistic_and_finalized(
                             &chain,
                             |state, execution_optimistic, finalized| {
                                 let index_opt = match &validator_id {
-                                    ValidatorId::PublicKey(pubkey) => {
-                                        state.validators().iter().position(|v| v.pubkey == *pubkey)
-                                    }
+                                    ValidatorId::PublicKey(pubkey) => pubkey_to_validator_index(
+                                        &chain, state, pubkey,
+                                    )
+                                    .map_err(|e| {
+                                        warp_utils::reject::custom_not_found(format!(
+                                            "unable to access pubkey cache: {e:?}",
+                                        ))
+                                    })?,
                                     ValidatorId::Index(index) => Some(*index as usize),
                                 };
 
@@ -795,9 +849,12 @@ pub fn serve<T: BeaconChainTypes>(
         .and(warp::path("committees"))
         .and(warp::query::<api_types::CommitteesQuery>())
         .and(warp::path::end())
-        .and_then(
-            |state_id: StateId, chain: Arc<BeaconChain<T>>, query: api_types::CommitteesQuery| {
-                blocking_json_task(move || {
+        .then(
+            |state_id: StateId,
+             task_spawner: TaskSpawner<T::EthSpec>,
+             chain: Arc<BeaconChain<T>>,
+             query: api_types::CommitteesQuery| {
+                task_spawner.blocking_json_task(Priority::P1, move || {
                     let (data, execution_optimistic, finalized) = state_id
                         .map_state_and_execution_optimistic_and_finalized(
                             &chain,
@@ -975,11 +1032,12 @@ pub fn serve<T: BeaconChainTypes>(
         .and(warp::path("sync_committees"))
         .and(warp::query::<api_types::SyncCommitteesQuery>())
         .and(warp::path::end())
-        .and_then(
+        .then(
             |state_id: StateId,
+             task_spawner: TaskSpawner<T::EthSpec>,
              chain: Arc<BeaconChain<T>>,
              query: api_types::SyncCommitteesQuery| {
-                blocking_json_task(move || {
+                task_spawner.blocking_json_task(Priority::P1, move || {
                     let (sync_committee, execution_optimistic, finalized) = state_id
                         .map_state_and_execution_optimistic_and_finalized(
                             &chain,
@@ -1040,9 +1098,12 @@ pub fn serve<T: BeaconChainTypes>(
         .and(warp::path("randao"))
         .and(warp::query::<api_types::RandaoQuery>())
         .and(warp::path::end())
-        .and_then(
-            |state_id: StateId, chain: Arc<BeaconChain<T>>, query: api_types::RandaoQuery| {
-                blocking_json_task(move || {
+        .then(
+            |state_id: StateId,
+             task_spawner: TaskSpawner<T::EthSpec>,
+             chain: Arc<BeaconChain<T>>,
+             query: api_types::RandaoQuery| {
+                task_spawner.blocking_json_task(Priority::P1, move || {
                     let (randao, execution_optimistic, finalized) = state_id
                         .map_state_and_execution_optimistic_and_finalized(
                             &chain,
@@ -1077,10 +1138,13 @@ pub fn serve<T: BeaconChainTypes>(
         .and(warp::path("headers"))
         .and(warp::query::<api_types::HeadersQuery>())
         .and(warp::path::end())
+        .and(task_spawner_filter.clone())
         .and(chain_filter.clone())
-        .and_then(
-            |query: api_types::HeadersQuery, chain: Arc<BeaconChain<T>>| {
-                blocking_json_task(move || {
+        .then(
+            |query: api_types::HeadersQuery,
+             task_spawner: TaskSpawner<T::EthSpec>,
+             chain: Arc<BeaconChain<T>>| {
+                task_spawner.blocking_json_task(Priority::P1, move || {
                     let (root, block, execution_optimistic, finalized) =
                         match (query.slot, query.parent_root) {
                             // No query parameters, return the canonical head block.
@@ -1174,36 +1238,41 @@ pub fn serve<T: BeaconChainTypes>(
             ))
         }))
         .and(warp::path::end())
+        .and(task_spawner_filter.clone())
         .and(chain_filter.clone())
-        .and_then(|block_id: BlockId, chain: Arc<BeaconChain<T>>| {
-            blocking_json_task(move || {
-                let (root, execution_optimistic, finalized) = block_id.root(&chain)?;
-                // Ignore the second `execution_optimistic` since the first one has more
-                // information about the original request.
-                let (block, _execution_optimistic, _finalized) =
-                    BlockId::from_root(root).blinded_block(&chain)?;
+        .then(
+            |block_id: BlockId,
+             task_spawner: TaskSpawner<T::EthSpec>,
+             chain: Arc<BeaconChain<T>>| {
+                task_spawner.blocking_json_task(Priority::P1, move || {
+                    let (root, execution_optimistic, finalized) = block_id.root(&chain)?;
+                    // Ignore the second `execution_optimistic` since the first one has more
+                    // information about the original request.
+                    let (block, _execution_optimistic, _finalized) =
+                        BlockId::from_root(root).blinded_block(&chain)?;
 
-                let canonical = chain
-                    .block_root_at_slot(block.slot(), WhenSlotSkipped::None)
-                    .map_err(warp_utils::reject::beacon_chain_error)?
-                    .map_or(false, |canonical| root == canonical);
+                    let canonical = chain
+                        .block_root_at_slot(block.slot(), WhenSlotSkipped::None)
+                        .map_err(warp_utils::reject::beacon_chain_error)?
+                        .map_or(false, |canonical| root == canonical);
 
-                let data = api_types::BlockHeaderData {
-                    root,
-                    canonical,
-                    header: api_types::BlockHeaderAndSignature {
-                        message: block.message().block_header(),
-                        signature: block.signature().clone().into(),
-                    },
-                };
+                    let data = api_types::BlockHeaderData {
+                        root,
+                        canonical,
+                        header: api_types::BlockHeaderAndSignature {
+                            message: block.message().block_header(),
+                            signature: block.signature().clone().into(),
+                        },
+                    };
 
-                Ok(api_types::ExecutionOptimisticFinalizedResponse {
-                    execution_optimistic: Some(execution_optimistic),
-                    finalized: Some(finalized),
-                    data,
+                    Ok(api_types::ExecutionOptimisticFinalizedResponse {
+                        execution_optimistic: Some(execution_optimistic),
+                        finalized: Some(finalized),
+                        data,
+                    })
                 })
-            })
-        });
+            },
+        );
 
     /*
      * beacon/blocks
@@ -1215,24 +1284,65 @@ pub fn serve<T: BeaconChainTypes>(
         .and(warp::path("blocks"))
         .and(warp::path::end())
         .and(warp::body::json())
+        .and(task_spawner_filter.clone())
         .and(chain_filter.clone())
         .and(network_tx_filter.clone())
         .and(log_filter.clone())
-        .and_then(
-            |block: Arc<SignedBeaconBlock<T::EthSpec>>,
-             chain: Arc<BeaconChain<T>>,
-             network_tx: UnboundedSender<NetworkMessage<T::EthSpec>>,
-             log: Logger| async move {
-                publish_blocks::publish_block(
-                    None,
-                    ProvenancedBlock::local(block),
-                    chain,
-                    &network_tx,
-                    log,
-                    BroadcastValidation::default(),
-                )
-                .await
-                .map(|()| warp::reply().into_response())
+        .then(
+            move |block: Arc<SignedBeaconBlock<T::EthSpec>>,
+                  task_spawner: TaskSpawner<T::EthSpec>,
+                  chain: Arc<BeaconChain<T>>,
+                  network_tx: UnboundedSender<NetworkMessage<T::EthSpec>>,
+                  log: Logger| {
+                task_spawner.spawn_async_with_rejection(Priority::P0, async move {
+                    publish_blocks::publish_block(
+                        None,
+                        ProvenancedBlock::local(block),
+                        chain,
+                        &network_tx,
+                        log,
+                        BroadcastValidation::default(),
+                        duplicate_block_status_code,
+                    )
+                    .await
+                })
+            },
+        );
+
+    let post_beacon_blocks_ssz = eth_v1
+        .and(warp::path("beacon"))
+        .and(warp::path("blocks"))
+        .and(warp::path::end())
+        .and(warp::body::bytes())
+        .and(task_spawner_filter.clone())
+        .and(chain_filter.clone())
+        .and(network_tx_filter.clone())
+        .and(log_filter.clone())
+        .then(
+            move |block_bytes: Bytes,
+                  task_spawner: TaskSpawner<T::EthSpec>,
+                  chain: Arc<BeaconChain<T>>,
+                  network_tx: UnboundedSender<NetworkMessage<T::EthSpec>>,
+                  log: Logger| {
+                task_spawner.spawn_async_with_rejection(Priority::P0, async move {
+                    let block =
+                        SignedBeaconBlock::<T::EthSpec>::from_ssz_bytes(&block_bytes, &chain.spec)
+                            .map_err(|e| {
+                                warp_utils::reject::custom_bad_request(format!(
+                                    "invalid SSZ: {e:?}"
+                                ))
+                            })?;
+                    publish_blocks::publish_block(
+                        None,
+                        ProvenancedBlock::local(Arc::new(block)),
+                        chain,
+                        &network_tx,
+                        log,
+                        BroadcastValidation::default(),
+                        duplicate_block_status_code,
+                    )
+                    .await
+                })
             },
         );
 
@@ -1242,65 +1352,139 @@ pub fn serve<T: BeaconChainTypes>(
         .and(warp::query::<api_types::BroadcastValidationQuery>())
         .and(warp::path::end())
         .and(warp::body::json())
+        .and(task_spawner_filter.clone())
         .and(chain_filter.clone())
         .and(network_tx_filter.clone())
         .and(log_filter.clone())
         .then(
-            |validation_level: api_types::BroadcastValidationQuery,
-             block: Arc<SignedBeaconBlock<T::EthSpec>>,
-             chain: Arc<BeaconChain<T>>,
-             network_tx: UnboundedSender<NetworkMessage<T::EthSpec>>,
-             log: Logger| async move {
-                match publish_blocks::publish_block(
-                    None,
-                    ProvenancedBlock::local(block),
-                    chain,
-                    &network_tx,
-                    log,
-                    validation_level.broadcast_validation,
-                )
-                .await
-                {
-                    Ok(()) => warp::reply().into_response(),
-                    Err(e) => match warp_utils::reject::handle_rejection(e).await {
-                        Ok(reply) => reply.into_response(),
-                        Err(_) => warp::reply::with_status(
-                            StatusCode::INTERNAL_SERVER_ERROR,
-                            eth2::StatusCode::INTERNAL_SERVER_ERROR,
-                        )
-                        .into_response(),
-                    },
-                }
+            move |validation_level: api_types::BroadcastValidationQuery,
+                  block: Arc<SignedBeaconBlock<T::EthSpec>>,
+                  task_spawner: TaskSpawner<T::EthSpec>,
+                  chain: Arc<BeaconChain<T>>,
+                  network_tx: UnboundedSender<NetworkMessage<T::EthSpec>>,
+                  log: Logger| {
+                task_spawner.spawn_async_with_rejection(Priority::P0, async move {
+                    publish_blocks::publish_block(
+                        None,
+                        ProvenancedBlock::local(block),
+                        chain,
+                        &network_tx,
+                        log,
+                        validation_level.broadcast_validation,
+                        duplicate_block_status_code,
+                    )
+                    .await
+                })
+            },
+        );
+
+    let post_beacon_blocks_v2_ssz = eth_v2
+        .and(warp::path("beacon"))
+        .and(warp::path("blocks"))
+        .and(warp::query::<api_types::BroadcastValidationQuery>())
+        .and(warp::path::end())
+        .and(warp::body::bytes())
+        .and(task_spawner_filter.clone())
+        .and(chain_filter.clone())
+        .and(network_tx_filter.clone())
+        .and(log_filter.clone())
+        .then(
+            move |validation_level: api_types::BroadcastValidationQuery,
+                  block_bytes: Bytes,
+                  task_spawner: TaskSpawner<T::EthSpec>,
+                  chain: Arc<BeaconChain<T>>,
+                  network_tx: UnboundedSender<NetworkMessage<T::EthSpec>>,
+                  log: Logger| {
+                task_spawner.spawn_async_with_rejection(Priority::P0, async move {
+                    let block =
+                        SignedBeaconBlock::<T::EthSpec>::from_ssz_bytes(&block_bytes, &chain.spec)
+                            .map_err(|e| {
+                                warp_utils::reject::custom_bad_request(format!(
+                                    "invalid SSZ: {e:?}"
+                                ))
+                            })?;
+                    publish_blocks::publish_block(
+                        None,
+                        ProvenancedBlock::local(Arc::new(block)),
+                        chain,
+                        &network_tx,
+                        log,
+                        validation_level.broadcast_validation,
+                        duplicate_block_status_code,
+                    )
+                    .await
+                })
             },
         );
 
     /*
-     * beacon/blocks
+     * beacon/blinded_blocks
      */
 
-    // POST beacon/blocks
+    // POST beacon/blinded_blocks
     let post_beacon_blinded_blocks = eth_v1
         .and(warp::path("beacon"))
         .and(warp::path("blinded_blocks"))
         .and(warp::path::end())
         .and(warp::body::json())
+        .and(task_spawner_filter.clone())
         .and(chain_filter.clone())
         .and(network_tx_filter.clone())
         .and(log_filter.clone())
-        .and_then(
-            |block: SignedBeaconBlock<T::EthSpec, BlindedPayload<_>>,
-             chain: Arc<BeaconChain<T>>,
-             network_tx: UnboundedSender<NetworkMessage<T::EthSpec>>,
-             log: Logger| async move {
-                publish_blocks::publish_blinded_block(
-                    block,
-                    chain,
-                    &network_tx,
-                    log,
-                    BroadcastValidation::default(),
-                )
-                .await
-                .map(|()| warp::reply().into_response())
+        .then(
+            move |block: SignedBlindedBeaconBlock<T::EthSpec>,
+                  task_spawner: TaskSpawner<T::EthSpec>,
+                  chain: Arc<BeaconChain<T>>,
+                  network_tx: UnboundedSender<NetworkMessage<T::EthSpec>>,
+                  log: Logger| {
+                task_spawner.spawn_async_with_rejection(Priority::P0, async move {
+                    publish_blocks::publish_blinded_block(
+                        block,
+                        chain,
+                        &network_tx,
+                        log,
+                        BroadcastValidation::default(),
+                        duplicate_block_status_code,
+                    )
+                    .await
+                })
+            },
+        );
+
+    // POST beacon/blocks
+    let post_beacon_blinded_blocks_ssz = eth_v1
+        .and(warp::path("beacon"))
+        .and(warp::path("blinded_blocks"))
+        .and(warp::path::end())
+        .and(warp::body::bytes())
+        .and(task_spawner_filter.clone())
+        .and(chain_filter.clone())
+        .and(network_tx_filter.clone())
+        .and(log_filter.clone())
+        .then(
+            move |block_bytes: Bytes,
+                  task_spawner: TaskSpawner<T::EthSpec>,
+                  chain: Arc<BeaconChain<T>>,
+                  network_tx: UnboundedSender<NetworkMessage<T::EthSpec>>,
+                  log: Logger| {
+                task_spawner.spawn_async_with_rejection(Priority::P0, async move {
+                    let block = SignedBlindedBeaconBlock::<T::EthSpec>::from_ssz_bytes(
+                        &block_bytes,
+                        &chain.spec,
+                    )
+                    .map_err(|e| {
+                        warp_utils::reject::custom_bad_request(format!("invalid SSZ: {e:?}"))
+                    })?;
+                    publish_blocks::publish_blinded_block(
+                        block,
+                        chain,
+                        &network_tx,
+                        log,
+                        BroadcastValidation::default(),
+                        duplicate_block_status_code,
+                    )
+                    .await
+                })
             },
         );
 
@@ -1310,34 +1494,66 @@ pub fn serve<T: BeaconChainTypes>(
         .and(warp::query::<api_types::BroadcastValidationQuery>())
         .and(warp::path::end())
         .and(warp::body::json())
+        .and(task_spawner_filter.clone())
         .and(chain_filter.clone())
         .and(network_tx_filter.clone())
         .and(log_filter.clone())
         .then(
-            |validation_level: api_types::BroadcastValidationQuery,
-             block: SignedBeaconBlock<T::EthSpec, BlindedPayload<_>>,
-             chain: Arc<BeaconChain<T>>,
-             network_tx: UnboundedSender<NetworkMessage<T::EthSpec>>,
-             log: Logger| async move {
-                match publish_blocks::publish_blinded_block(
-                    block,
-                    chain,
-                    &network_tx,
-                    log,
-                    validation_level.broadcast_validation,
-                )
-                .await
-                {
-                    Ok(()) => warp::reply().into_response(),
-                    Err(e) => match warp_utils::reject::handle_rejection(e).await {
-                        Ok(reply) => reply.into_response(),
-                        Err(_) => warp::reply::with_status(
-                            StatusCode::INTERNAL_SERVER_ERROR,
-                            eth2::StatusCode::INTERNAL_SERVER_ERROR,
-                        )
-                        .into_response(),
-                    },
-                }
+            move |validation_level: api_types::BroadcastValidationQuery,
+                  block: SignedBlindedBeaconBlock<T::EthSpec>,
+                  task_spawner: TaskSpawner<T::EthSpec>,
+                  chain: Arc<BeaconChain<T>>,
+                  network_tx: UnboundedSender<NetworkMessage<T::EthSpec>>,
+                  log: Logger| {
+                task_spawner.spawn_async_with_rejection(Priority::P0, async move {
+                    publish_blocks::publish_blinded_block(
+                        block,
+                        chain,
+                        &network_tx,
+                        log,
+                        validation_level.broadcast_validation,
+                        duplicate_block_status_code,
+                    )
+                    .await
+                })
+            },
+        );
+
+    let post_beacon_blinded_blocks_v2_ssz = eth_v2
+        .and(warp::path("beacon"))
+        .and(warp::path("blinded_blocks"))
+        .and(warp::query::<api_types::BroadcastValidationQuery>())
+        .and(warp::path::end())
+        .and(warp::body::bytes())
+        .and(task_spawner_filter.clone())
+        .and(chain_filter.clone())
+        .and(network_tx_filter.clone())
+        .and(log_filter.clone())
+        .then(
+            move |validation_level: api_types::BroadcastValidationQuery,
+                  block_bytes: Bytes,
+                  task_spawner: TaskSpawner<T::EthSpec>,
+                  chain: Arc<BeaconChain<T>>,
+                  network_tx: UnboundedSender<NetworkMessage<T::EthSpec>>,
+                  log: Logger| {
+                task_spawner.spawn_async_with_rejection(Priority::P0, async move {
+                    let block = SignedBlindedBeaconBlock::<T::EthSpec>::from_ssz_bytes(
+                        &block_bytes,
+                        &chain.spec,
+                    )
+                    .map_err(|e| {
+                        warp_utils::reject::custom_bad_request(format!("invalid SSZ: {e:?}"))
+                    })?;
+                    publish_blocks::publish_blinded_block(
+                        block,
+                        chain,
+                        &network_tx,
+                        log,
+                        validation_level.broadcast_validation,
+                        duplicate_block_status_code,
+                    )
+                    .await
+                })
             },
         );
 
@@ -1351,12 +1567,14 @@ pub fn serve<T: BeaconChainTypes>(
         .and(warp::path("beacon"))
         .and(warp::path("blocks"))
         .and(block_id_or_err)
+        .and(task_spawner_filter.clone())
         .and(chain_filter.clone());
 
     let beacon_blocks_path_any = any_version
         .and(warp::path("beacon"))
         .and(warp::path("blocks"))
         .and(block_id_or_err)
+        .and(task_spawner_filter.clone())
         .and(chain_filter.clone());
 
     // GET beacon/blocks/{block_id}
@@ -1364,12 +1582,13 @@ pub fn serve<T: BeaconChainTypes>(
         .clone()
         .and(warp::path::end())
         .and(warp::header::optional::<api_types::Accept>("accept"))
-        .and_then(
+        .then(
             |endpoint_version: EndpointVersion,
              block_id: BlockId,
+             task_spawner: TaskSpawner<T::EthSpec>,
              chain: Arc<BeaconChain<T>>,
              accept_header: Option<api_types::Accept>| {
-                async move {
+                task_spawner.spawn_async_with_rejection(Priority::P1, async move {
                     let (block, execution_optimistic, finalized) =
                         block_id.full_block(&chain).await?;
                     let fork_name = block
@@ -1397,7 +1616,7 @@ pub fn serve<T: BeaconChainTypes>(
                         .map(|res| warp::reply::json(&res).into_response()),
                     }
                     .map(|resp| add_consensus_version_header(resp, fork_name))
-                }
+                })
             },
         );
 
@@ -1406,44 +1625,56 @@ pub fn serve<T: BeaconChainTypes>(
         .clone()
         .and(warp::path("root"))
         .and(warp::path::end())
-        .and_then(|block_id: BlockId, chain: Arc<BeaconChain<T>>| {
-            blocking_json_task(move || {
-                let (block, execution_optimistic, finalized) = block_id.blinded_block(&chain)?;
-                Ok(api_types::GenericResponse::from(api_types::RootData::from(
-                    block.canonical_root(),
-                ))
-                .add_execution_optimistic_finalized(execution_optimistic, finalized))
-            })
-        });
+        .then(
+            |block_id: BlockId,
+             task_spawner: TaskSpawner<T::EthSpec>,
+             chain: Arc<BeaconChain<T>>| {
+                task_spawner.blocking_json_task(Priority::P1, move || {
+                    let (block, execution_optimistic, finalized) =
+                        block_id.blinded_block(&chain)?;
+                    Ok(api_types::GenericResponse::from(api_types::RootData::from(
+                        block.canonical_root(),
+                    ))
+                    .add_execution_optimistic_finalized(execution_optimistic, finalized))
+                })
+            },
+        );
 
     // GET beacon/blocks/{block_id}/attestations
     let get_beacon_block_attestations = beacon_blocks_path_v1
         .clone()
         .and(warp::path("attestations"))
         .and(warp::path::end())
-        .and_then(|block_id: BlockId, chain: Arc<BeaconChain<T>>| {
-            blocking_json_task(move || {
-                let (block, execution_optimistic, finalized) = block_id.blinded_block(&chain)?;
-                Ok(
-                    api_types::GenericResponse::from(block.message().body().attestations().clone())
-                        .add_execution_optimistic_finalized(execution_optimistic, finalized),
-                )
-            })
-        });
+        .then(
+            |block_id: BlockId,
+             task_spawner: TaskSpawner<T::EthSpec>,
+             chain: Arc<BeaconChain<T>>| {
+                task_spawner.blocking_json_task(Priority::P1, move || {
+                    let (block, execution_optimistic, finalized) =
+                        block_id.blinded_block(&chain)?;
+                    Ok(api_types::GenericResponse::from(
+                        block.message().body().attestations().clone(),
+                    )
+                    .add_execution_optimistic_finalized(execution_optimistic, finalized))
+                })
+            },
+        );
 
     // GET beacon/blinded_blocks/{block_id}
     let get_beacon_blinded_block = eth_v1
         .and(warp::path("beacon"))
         .and(warp::path("blinded_blocks"))
         .and(block_id_or_err)
+        .and(task_spawner_filter.clone())
         .and(chain_filter.clone())
         .and(warp::path::end())
         .and(warp::header::optional::<api_types::Accept>("accept"))
-        .and_then(
+        .then(
             |block_id: BlockId,
+             task_spawner: TaskSpawner<T::EthSpec>,
              chain: Arc<BeaconChain<T>>,
              accept_header: Option<api_types::Accept>| {
-                blocking_response_task(move || {
+                task_spawner.blocking_response_task(Priority::P1, move || {
                     let (block, execution_optimistic, finalized) =
                         block_id.blinded_block(&chain)?;
                     let fork_name = block
@@ -1485,6 +1716,7 @@ pub fn serve<T: BeaconChainTypes>(
     let beacon_pool_path = eth_v1
         .and(warp::path("beacon"))
         .and(warp::path("pool"))
+        .and(task_spawner_filter.clone())
         .and(chain_filter.clone());
 
     // POST beacon/pool/attestations
@@ -1495,12 +1727,13 @@ pub fn serve<T: BeaconChainTypes>(
         .and(warp::body::json())
         .and(network_tx_filter.clone())
         .and(log_filter.clone())
-        .and_then(
-            |chain: Arc<BeaconChain<T>>,
+        .then(
+            |task_spawner: TaskSpawner<T::EthSpec>,
+             chain: Arc<BeaconChain<T>>,
              attestations: Vec<Attestation<T::EthSpec>>,
              network_tx: UnboundedSender<NetworkMessage<T::EthSpec>>,
              log: Logger| {
-                blocking_json_task(move || {
+                task_spawner.blocking_json_task(Priority::P0, move || {
                     let seen_timestamp = timestamp_now();
                     let mut failures = Vec::new();
                     let mut num_already_known = 0;
@@ -1636,9 +1869,11 @@ pub fn serve<T: BeaconChainTypes>(
         .and(warp::path("attestations"))
         .and(warp::path::end())
         .and(warp::query::<api_types::AttestationPoolQuery>())
-        .and_then(
-            |chain: Arc<BeaconChain<T>>, query: api_types::AttestationPoolQuery| {
-                blocking_json_task(move || {
+        .then(
+            |task_spawner: TaskSpawner<T::EthSpec>,
+             chain: Arc<BeaconChain<T>>,
+             query: api_types::AttestationPoolQuery| {
+                task_spawner.blocking_json_task(Priority::P1, move || {
                     let query_filter = |data: &AttestationData| {
                         query.slot.map_or(true, |slot| slot == data.slot)
                             && query
@@ -1667,11 +1902,12 @@ pub fn serve<T: BeaconChainTypes>(
         .and(warp::path::end())
         .and(warp::body::json())
         .and(network_tx_filter.clone())
-        .and_then(
-            |chain: Arc<BeaconChain<T>>,
+        .then(
+            |task_spawner: TaskSpawner<T::EthSpec>,
+             chain: Arc<BeaconChain<T>>,
              slashing: AttesterSlashing<T::EthSpec>,
              network_tx: UnboundedSender<NetworkMessage<T::EthSpec>>| {
-                blocking_json_task(move || {
+                task_spawner.blocking_json_task(Priority::P0, move || {
                     let outcome = chain
                         .verify_attester_slashing_for_gossip(slashing.clone())
                         .map_err(|e| {
@@ -1708,12 +1944,14 @@ pub fn serve<T: BeaconChainTypes>(
         .clone()
         .and(warp::path("attester_slashings"))
         .and(warp::path::end())
-        .and_then(|chain: Arc<BeaconChain<T>>| {
-            blocking_json_task(move || {
-                let attestations = chain.op_pool.get_all_attester_slashings();
-                Ok(api_types::GenericResponse::from(attestations))
-            })
-        });
+        .then(
+            |task_spawner: TaskSpawner<T::EthSpec>, chain: Arc<BeaconChain<T>>| {
+                task_spawner.blocking_json_task(Priority::P1, move || {
+                    let attestations = chain.op_pool.get_all_attester_slashings();
+                    Ok(api_types::GenericResponse::from(attestations))
+                })
+            },
+        );
 
     // POST beacon/pool/proposer_slashings
     let post_beacon_pool_proposer_slashings = beacon_pool_path
@@ -1722,11 +1960,12 @@ pub fn serve<T: BeaconChainTypes>(
         .and(warp::path::end())
         .and(warp::body::json())
         .and(network_tx_filter.clone())
-        .and_then(
-            |chain: Arc<BeaconChain<T>>,
+        .then(
+            |task_spawner: TaskSpawner<T::EthSpec>,
+             chain: Arc<BeaconChain<T>>,
              slashing: ProposerSlashing,
              network_tx: UnboundedSender<NetworkMessage<T::EthSpec>>| {
-                blocking_json_task(move || {
+                task_spawner.blocking_json_task(Priority::P0, move || {
                     let outcome = chain
                         .verify_proposer_slashing_for_gossip(slashing.clone())
                         .map_err(|e| {
@@ -1763,12 +2002,14 @@ pub fn serve<T: BeaconChainTypes>(
         .clone()
         .and(warp::path("proposer_slashings"))
         .and(warp::path::end())
-        .and_then(|chain: Arc<BeaconChain<T>>| {
-            blocking_json_task(move || {
-                let attestations = chain.op_pool.get_all_proposer_slashings();
-                Ok(api_types::GenericResponse::from(attestations))
-            })
-        });
+        .then(
+            |task_spawner: TaskSpawner<T::EthSpec>, chain: Arc<BeaconChain<T>>| {
+                task_spawner.blocking_json_task(Priority::P1, move || {
+                    let attestations = chain.op_pool.get_all_proposer_slashings();
+                    Ok(api_types::GenericResponse::from(attestations))
+                })
+            },
+        );
 
     // POST beacon/pool/voluntary_exits
     let post_beacon_pool_voluntary_exits = beacon_pool_path
@@ -1777,11 +2018,12 @@ pub fn serve<T: BeaconChainTypes>(
         .and(warp::path::end())
         .and(warp::body::json())
         .and(network_tx_filter.clone())
-        .and_then(
-            |chain: Arc<BeaconChain<T>>,
+        .then(
+            |task_spawner: TaskSpawner<T::EthSpec>,
+             chain: Arc<BeaconChain<T>>,
              exit: SignedVoluntaryExit,
              network_tx: UnboundedSender<NetworkMessage<T::EthSpec>>| {
-                blocking_json_task(move || {
+                task_spawner.blocking_json_task(Priority::P0, move || {
                     let outcome = chain
                         .verify_voluntary_exit_for_gossip(exit.clone())
                         .map_err(|e| {
@@ -1816,12 +2058,14 @@ pub fn serve<T: BeaconChainTypes>(
         .clone()
         .and(warp::path("voluntary_exits"))
         .and(warp::path::end())
-        .and_then(|chain: Arc<BeaconChain<T>>| {
-            blocking_json_task(move || {
-                let attestations = chain.op_pool.get_all_voluntary_exits();
-                Ok(api_types::GenericResponse::from(attestations))
-            })
-        });
+        .then(
+            |task_spawner: TaskSpawner<T::EthSpec>, chain: Arc<BeaconChain<T>>| {
+                task_spawner.blocking_json_task(Priority::P1, move || {
+                    let attestations = chain.op_pool.get_all_voluntary_exits();
+                    Ok(api_types::GenericResponse::from(attestations))
+                })
+            },
+        );
 
     // POST beacon/pool/sync_committees
     let post_beacon_pool_sync_committees = beacon_pool_path
@@ -1831,12 +2075,13 @@ pub fn serve<T: BeaconChainTypes>(
         .and(warp::body::json())
         .and(network_tx_filter.clone())
         .and(log_filter.clone())
-        .and_then(
-            |chain: Arc<BeaconChain<T>>,
+        .then(
+            |task_spawner: TaskSpawner<T::EthSpec>,
+             chain: Arc<BeaconChain<T>>,
              signatures: Vec<SyncCommitteeMessage>,
              network_tx: UnboundedSender<NetworkMessage<T::EthSpec>>,
              log: Logger| {
-                blocking_json_task(move || {
+                task_spawner.blocking_json_task(Priority::P0, move || {
                     sync_committees::process_sync_committee_signatures(
                         signatures, network_tx, &chain, log,
                     )?;
@@ -1850,12 +2095,14 @@ pub fn serve<T: BeaconChainTypes>(
         .clone()
         .and(warp::path("bls_to_execution_changes"))
         .and(warp::path::end())
-        .and_then(|chain: Arc<BeaconChain<T>>| {
-            blocking_json_task(move || {
-                let address_changes = chain.op_pool.get_all_bls_to_execution_changes();
-                Ok(api_types::GenericResponse::from(address_changes))
-            })
-        });
+        .then(
+            |task_spawner: TaskSpawner<T::EthSpec>, chain: Arc<BeaconChain<T>>| {
+                task_spawner.blocking_json_task(Priority::P1, move || {
+                    let address_changes = chain.op_pool.get_all_bls_to_execution_changes();
+                    Ok(api_types::GenericResponse::from(address_changes))
+                })
+            },
+        );
 
     // POST beacon/pool/bls_to_execution_changes
     let post_beacon_pool_bls_to_execution_changes = beacon_pool_path
@@ -1865,12 +2112,13 @@ pub fn serve<T: BeaconChainTypes>(
         .and(warp::body::json())
         .and(network_tx_filter.clone())
         .and(log_filter.clone())
-        .and_then(
-            |chain: Arc<BeaconChain<T>>,
+        .then(
+            |task_spawner: TaskSpawner<T::EthSpec>,
+             chain: Arc<BeaconChain<T>>,
              address_changes: Vec<SignedBlsToExecutionChange>,
              network_tx: UnboundedSender<NetworkMessage<T::EthSpec>>,
              log: Logger| {
-                blocking_json_task(move || {
+                task_spawner.blocking_json_task(Priority::P0, move || {
                     let mut failures = vec![];
 
                     for (index, address_change) in address_changes.into_iter().enumerate() {
@@ -1954,10 +2202,13 @@ pub fn serve<T: BeaconChainTypes>(
         .and(warp::path("deposit_snapshot"))
         .and(warp::path::end())
         .and(warp::header::optional::<api_types::Accept>("accept"))
+        .and(task_spawner_filter.clone())
         .and(eth1_service_filter.clone())
-        .and_then(
-            |accept_header: Option<api_types::Accept>, eth1_service: eth1::Service| {
-                blocking_response_task(move || match accept_header {
+        .then(
+            |accept_header: Option<api_types::Accept>,
+             task_spawner: TaskSpawner<T::EthSpec>,
+             eth1_service: eth1::Service| {
+                task_spawner.blocking_response_task(Priority::P1, move || match accept_header {
                     Some(api_types::Accept::Json) | None => {
                         let snapshot = eth1_service.get_deposit_snapshot();
                         Ok(
@@ -1998,6 +2249,7 @@ pub fn serve<T: BeaconChainTypes>(
     let beacon_rewards_path = eth_v1
         .and(warp::path("beacon"))
         .and(warp::path("rewards"))
+        .and(task_spawner_filter.clone())
         .and(chain_filter.clone());
 
     // GET beacon/rewards/blocks/{block_id}
@@ -2006,17 +2258,75 @@ pub fn serve<T: BeaconChainTypes>(
         .and(warp::path("blocks"))
         .and(block_id_or_err)
         .and(warp::path::end())
-        .and_then(|chain: Arc<BeaconChain<T>>, block_id: BlockId| {
-            blocking_json_task(move || {
-                let (rewards, execution_optimistic, finalized) =
-                    standard_block_rewards::compute_beacon_block_rewards(chain, block_id)?;
-                Ok(rewards)
-                    .map(api_types::GenericResponse::from)
-                    .map(|resp| {
-                        resp.add_execution_optimistic_finalized(execution_optimistic, finalized)
-                    })
-            })
-        });
+        .then(
+            |task_spawner: TaskSpawner<T::EthSpec>,
+             chain: Arc<BeaconChain<T>>,
+             block_id: BlockId| {
+                task_spawner.blocking_json_task(Priority::P1, move || {
+                    let (rewards, execution_optimistic, finalized) =
+                        standard_block_rewards::compute_beacon_block_rewards(chain, block_id)?;
+                    Ok(rewards)
+                        .map(api_types::GenericResponse::from)
+                        .map(|resp| {
+                            resp.add_execution_optimistic_finalized(execution_optimistic, finalized)
+                        })
+                })
+            },
+        );
+
+    /*
+     * builder/states
+     */
+
+    let builder_states_path = eth_v1
+        .and(warp::path("builder"))
+        .and(warp::path("states"))
+        .and(chain_filter.clone());
+
+    // GET builder/states/{state_id}/expected_withdrawals
+    let get_expected_withdrawals = builder_states_path
+        .clone()
+        .and(task_spawner_filter.clone())
+        .and(warp::path::param::<StateId>())
+        .and(warp::path("expected_withdrawals"))
+        .and(warp::query::<api_types::ExpectedWithdrawalsQuery>())
+        .and(warp::path::end())
+        .and(warp::header::optional::<api_types::Accept>("accept"))
+        .then(
+            |chain: Arc<BeaconChain<T>>,
+             task_spawner: TaskSpawner<T::EthSpec>,
+             state_id: StateId,
+             query: api_types::ExpectedWithdrawalsQuery,
+             accept_header: Option<api_types::Accept>| {
+                task_spawner.blocking_response_task(Priority::P1, move || {
+                    let (state, execution_optimistic, finalized) = state_id.state(&chain)?;
+                    let proposal_slot = query.proposal_slot.unwrap_or(state.slot() + 1);
+                    let withdrawals =
+                        get_next_withdrawals::<T>(&chain, state, state_id, proposal_slot)?;
+
+                    match accept_header {
+                        Some(api_types::Accept::Ssz) => Response::builder()
+                            .status(200)
+                            .header("Content-Type", "application/octet-stream")
+                            .body(withdrawals.as_ssz_bytes().into())
+                            .map_err(|e| {
+                                warp_utils::reject::custom_server_error(format!(
+                                    "failed to create response: {}",
+                                    e
+                                ))
+                            }),
+                        _ => Ok(warp::reply::json(
+                            &api_types::ExecutionOptimisticFinalizedResponse {
+                                data: withdrawals,
+                                execution_optimistic: Some(execution_optimistic),
+                                finalized: Some(finalized),
+                            },
+                        )
+                        .into_response()),
+                    }
+                })
+            },
+        );
 
     /*
      * beacon/rewards
@@ -2025,6 +2335,7 @@ pub fn serve<T: BeaconChainTypes>(
     let beacon_rewards_path = eth_v1
         .and(warp::path("beacon"))
         .and(warp::path("rewards"))
+        .and(task_spawner_filter.clone())
         .and(chain_filter.clone());
 
     // POST beacon/rewards/attestations/{epoch}
@@ -2034,15 +2345,14 @@ pub fn serve<T: BeaconChainTypes>(
         .and(warp::path::param::<Epoch>())
         .and(warp::path::end())
         .and(warp::body::json())
-        .and(log_filter.clone())
-        .and_then(
-            |chain: Arc<BeaconChain<T>>,
+        .then(
+            |task_spawner: TaskSpawner<T::EthSpec>,
+             chain: Arc<BeaconChain<T>>,
              epoch: Epoch,
-             validators: Vec<ValidatorId>,
-             log: Logger| {
-                blocking_json_task(move || {
+             validators: Vec<ValidatorId>| {
+                task_spawner.blocking_json_task(Priority::P1, move || {
                     let attestation_rewards = chain
-                        .compute_attestation_rewards(epoch, validators, log)
+                        .compute_attestation_rewards(epoch, validators)
                         .map_err(|e| match e {
                             BeaconChainError::MissingBeaconState(root) => {
                                 warp_utils::reject::custom_not_found(format!(
@@ -2087,12 +2397,13 @@ pub fn serve<T: BeaconChainTypes>(
         .and(warp::path::end())
         .and(warp::body::json())
         .and(log_filter.clone())
-        .and_then(
-            |chain: Arc<BeaconChain<T>>,
+        .then(
+            |task_spawner: TaskSpawner<T::EthSpec>,
+             chain: Arc<BeaconChain<T>>,
              block_id: BlockId,
              validators: Vec<ValidatorId>,
              log: Logger| {
-                blocking_json_task(move || {
+                task_spawner.blocking_json_task(Priority::P1, move || {
                     let (rewards, execution_optimistic, finalized) =
                         sync_committee_rewards::compute_sync_committee_rewards(
                             chain, block_id, validators, log,
@@ -2117,46 +2428,55 @@ pub fn serve<T: BeaconChainTypes>(
     let get_config_fork_schedule = config_path
         .and(warp::path("fork_schedule"))
         .and(warp::path::end())
+        .and(task_spawner_filter.clone())
         .and(chain_filter.clone())
-        .and_then(|chain: Arc<BeaconChain<T>>| {
-            blocking_json_task(move || {
-                let forks = ForkName::list_all()
-                    .into_iter()
-                    .filter_map(|fork_name| chain.spec.fork_for_name(fork_name))
-                    .collect::<Vec<_>>();
-                Ok(api_types::GenericResponse::from(forks))
-            })
-        });
+        .then(
+            |task_spawner: TaskSpawner<T::EthSpec>, chain: Arc<BeaconChain<T>>| {
+                task_spawner.blocking_json_task(Priority::P1, move || {
+                    let forks = ForkName::list_all()
+                        .into_iter()
+                        .filter_map(|fork_name| chain.spec.fork_for_name(fork_name))
+                        .collect::<Vec<_>>();
+                    Ok(api_types::GenericResponse::from(forks))
+                })
+            },
+        );
 
     // GET config/spec
     let spec_fork_name = ctx.config.spec_fork_name;
     let get_config_spec = config_path
         .and(warp::path("spec"))
         .and(warp::path::end())
+        .and(task_spawner_filter.clone())
         .and(chain_filter.clone())
-        .and_then(move |chain: Arc<BeaconChain<T>>| {
-            blocking_json_task(move || {
-                let config_and_preset =
-                    ConfigAndPreset::from_chain_spec::<T::EthSpec>(&chain.spec, spec_fork_name);
-                Ok(api_types::GenericResponse::from(config_and_preset))
-            })
-        });
+        .then(
+            move |task_spawner: TaskSpawner<T::EthSpec>, chain: Arc<BeaconChain<T>>| {
+                task_spawner.blocking_json_task(Priority::P0, move || {
+                    let config_and_preset =
+                        ConfigAndPreset::from_chain_spec::<T::EthSpec>(&chain.spec, spec_fork_name);
+                    Ok(api_types::GenericResponse::from(config_and_preset))
+                })
+            },
+        );
 
     // GET config/deposit_contract
     let get_config_deposit_contract = config_path
         .and(warp::path("deposit_contract"))
         .and(warp::path::end())
+        .and(task_spawner_filter.clone())
         .and(chain_filter.clone())
-        .and_then(|chain: Arc<BeaconChain<T>>| {
-            blocking_json_task(move || {
-                Ok(api_types::GenericResponse::from(
-                    api_types::DepositContractData {
-                        address: chain.spec.deposit_contract_address,
-                        chain_id: chain.spec.deposit_chain_id,
-                    },
-                ))
-            })
-        });
+        .then(
+            |task_spawner: TaskSpawner<T::EthSpec>, chain: Arc<BeaconChain<T>>| {
+                task_spawner.blocking_json_task(Priority::P1, move || {
+                    Ok(api_types::GenericResponse::from(
+                        api_types::DepositContractData {
+                            address: chain.spec.deposit_contract_address,
+                            chain_id: chain.spec.deposit_chain_id,
+                        },
+                    ))
+                })
+            },
+        );
 
     /*
      * debug
@@ -2174,13 +2494,15 @@ pub fn serve<T: BeaconChainTypes>(
         }))
         .and(warp::path::end())
         .and(warp::header::optional::<api_types::Accept>("accept"))
+        .and(task_spawner_filter.clone())
         .and(chain_filter.clone())
-        .and_then(
+        .then(
             |endpoint_version: EndpointVersion,
              state_id: StateId,
              accept_header: Option<api_types::Accept>,
+             task_spawner: TaskSpawner<T::EthSpec>,
              chain: Arc<BeaconChain<T>>| {
-                blocking_response_task(move || match accept_header {
+                task_spawner.blocking_response_task(Priority::P1, move || match accept_header {
                     Some(api_types::Accept::Ssz) => {
                         // We can ignore the optimistic status for the "fork" since it's a
                         // specification constant that doesn't change across competing heads of the
@@ -2232,10 +2554,13 @@ pub fn serve<T: BeaconChainTypes>(
         .and(warp::path("beacon"))
         .and(warp::path("heads"))
         .and(warp::path::end())
+        .and(task_spawner_filter.clone())
         .and(chain_filter.clone())
-        .and_then(
-            |endpoint_version: EndpointVersion, chain: Arc<BeaconChain<T>>| {
-                blocking_json_task(move || {
+        .then(
+            |endpoint_version: EndpointVersion,
+             task_spawner: TaskSpawner<T::EthSpec>,
+             chain: Arc<BeaconChain<T>>| {
+                task_spawner.blocking_json_task(Priority::P1, move || {
                     let heads = chain
                         .heads()
                         .into_iter()
@@ -2268,48 +2593,51 @@ pub fn serve<T: BeaconChainTypes>(
         .and(warp::path("debug"))
         .and(warp::path("fork_choice"))
         .and(warp::path::end())
+        .and(task_spawner_filter.clone())
         .and(chain_filter.clone())
-        .and_then(|chain: Arc<BeaconChain<T>>| {
-            blocking_json_task(move || {
-                let beacon_fork_choice = chain.canonical_head.fork_choice_read_lock();
+        .then(
+            |task_spawner: TaskSpawner<T::EthSpec>, chain: Arc<BeaconChain<T>>| {
+                task_spawner.blocking_json_task(Priority::P1, move || {
+                    let beacon_fork_choice = chain.canonical_head.fork_choice_read_lock();
 
-                let proto_array = beacon_fork_choice.proto_array().core_proto_array();
+                    let proto_array = beacon_fork_choice.proto_array().core_proto_array();
 
-                let fork_choice_nodes = proto_array
-                    .nodes
-                    .iter()
-                    .map(|node| {
-                        let execution_status = if node.execution_status.is_execution_enabled() {
-                            Some(node.execution_status.to_string())
-                        } else {
-                            None
-                        };
+                    let fork_choice_nodes = proto_array
+                        .nodes
+                        .iter()
+                        .map(|node| {
+                            let execution_status = if node.execution_status.is_execution_enabled() {
+                                Some(node.execution_status.to_string())
+                            } else {
+                                None
+                            };
 
-                        ForkChoiceNode {
-                            slot: node.slot,
-                            block_root: node.root,
-                            parent_root: node
-                                .parent
-                                .and_then(|index| proto_array.nodes.get(index))
-                                .map(|parent| parent.root),
-                            justified_epoch: node.justified_checkpoint.epoch,
-                            finalized_epoch: node.finalized_checkpoint.epoch,
-                            weight: node.weight,
-                            validity: execution_status,
-                            execution_block_hash: node
-                                .execution_status
-                                .block_hash()
-                                .map(|block_hash| block_hash.into_root()),
-                        }
+                            ForkChoiceNode {
+                                slot: node.slot,
+                                block_root: node.root,
+                                parent_root: node
+                                    .parent
+                                    .and_then(|index| proto_array.nodes.get(index))
+                                    .map(|parent| parent.root),
+                                justified_epoch: node.justified_checkpoint.epoch,
+                                finalized_epoch: node.finalized_checkpoint.epoch,
+                                weight: node.weight,
+                                validity: execution_status,
+                                execution_block_hash: node
+                                    .execution_status
+                                    .block_hash()
+                                    .map(|block_hash| block_hash.into_root()),
+                            }
+                        })
+                        .collect::<Vec<_>>();
+                    Ok(ForkChoice {
+                        justified_checkpoint: proto_array.justified_checkpoint,
+                        finalized_checkpoint: proto_array.finalized_checkpoint,
+                        fork_choice_nodes,
                     })
-                    .collect::<Vec<_>>();
-                Ok(ForkChoice {
-                    justified_checkpoint: proto_array.justified_checkpoint,
-                    finalized_checkpoint: proto_array.finalized_checkpoint,
-                    fork_choice_nodes,
                 })
-            })
-        });
+            },
+        );
 
     /*
      * node
@@ -2320,50 +2648,54 @@ pub fn serve<T: BeaconChainTypes>(
         .and(warp::path("node"))
         .and(warp::path("identity"))
         .and(warp::path::end())
+        .and(task_spawner_filter.clone())
         .and(network_globals.clone())
-        .and_then(|network_globals: Arc<NetworkGlobals<T::EthSpec>>| {
-            blocking_json_task(move || {
-                let enr = network_globals.local_enr();
-                let p2p_addresses = enr.multiaddr_p2p_tcp();
-                let discovery_addresses = enr.multiaddr_p2p_udp();
-                let meta_data = network_globals.local_metadata.read();
-                Ok(api_types::GenericResponse::from(api_types::IdentityData {
-                    peer_id: network_globals.local_peer_id().to_base58(),
-                    enr,
-                    p2p_addresses,
-                    discovery_addresses,
-                    metadata: api_types::MetaData {
-                        seq_number: *meta_data.seq_number(),
-                        attnets: format!(
-                            "0x{}",
-                            hex::encode(meta_data.attnets().clone().into_bytes()),
-                        ),
-                        syncnets: format!(
-                            "0x{}",
-                            hex::encode(
-                                meta_data
-                                    .syncnets()
-                                    .map(|x| x.clone())
-                                    .unwrap_or_default()
-                                    .into_bytes()
-                            )
-                        ),
-                    },
-                }))
-            })
-        });
+        .then(
+            |task_spawner: TaskSpawner<T::EthSpec>,
+             network_globals: Arc<NetworkGlobals<T::EthSpec>>| {
+                task_spawner.blocking_json_task(Priority::P1, move || {
+                    let enr = network_globals.local_enr();
+                    let p2p_addresses = enr.multiaddr_p2p_tcp();
+                    let discovery_addresses = enr.multiaddr_p2p_udp();
+                    let meta_data = network_globals.local_metadata.read();
+                    Ok(api_types::GenericResponse::from(api_types::IdentityData {
+                        peer_id: network_globals.local_peer_id().to_base58(),
+                        enr,
+                        p2p_addresses,
+                        discovery_addresses,
+                        metadata: api_types::MetaData {
+                            seq_number: *meta_data.seq_number(),
+                            attnets: format!(
+                                "0x{}",
+                                hex::encode(meta_data.attnets().clone().into_bytes()),
+                            ),
+                            syncnets: format!(
+                                "0x{}",
+                                hex::encode(
+                                    meta_data
+                                        .syncnets()
+                                        .map(|x| x.clone())
+                                        .unwrap_or_default()
+                                        .into_bytes()
+                                )
+                            ),
+                        },
+                    }))
+                })
+            },
+        );
 
     // GET node/version
     let get_node_version = eth_v1
         .and(warp::path("node"))
         .and(warp::path("version"))
         .and(warp::path::end())
-        .and_then(|| {
-            blocking_json_task(move || {
-                Ok(api_types::GenericResponse::from(api_types::VersionData {
-                    version: version_with_platform(),
-                }))
-            })
+        // Bypass the `task_spawner` since this method returns a static string.
+        .then(|| async {
+            warp::reply::json(&api_types::GenericResponse::from(api_types::VersionData {
+                version: version_with_platform(),
+            }))
+            .into_response()
         });
 
     // GET node/syncing
@@ -2371,10 +2703,13 @@ pub fn serve<T: BeaconChainTypes>(
         .and(warp::path("node"))
         .and(warp::path("syncing"))
         .and(warp::path::end())
+        .and(task_spawner_filter.clone())
         .and(network_globals.clone())
         .and(chain_filter.clone())
-        .and_then(
-            |network_globals: Arc<NetworkGlobals<T::EthSpec>>, chain: Arc<BeaconChain<T>>| {
+        .then(
+            |task_spawner: TaskSpawner<T::EthSpec>,
+             network_globals: Arc<NetworkGlobals<T::EthSpec>>,
+             chain: Arc<BeaconChain<T>>| {
                 async move {
                     let el_offline = if let Some(el) = &chain.execution_layer {
                         el.is_offline_or_erroring().await
@@ -2382,32 +2717,34 @@ pub fn serve<T: BeaconChainTypes>(
                         true
                     };
 
-                    blocking_json_task(move || {
-                        let head_slot = chain.canonical_head.cached_head().head_slot();
-                        let current_slot = chain.slot_clock.now_or_genesis().ok_or_else(|| {
-                            warp_utils::reject::custom_server_error(
-                                "Unable to read slot clock".into(),
-                            )
-                        })?;
+                    task_spawner
+                        .blocking_json_task(Priority::P0, move || {
+                            let head_slot = chain.canonical_head.cached_head().head_slot();
+                            let current_slot =
+                                chain.slot_clock.now_or_genesis().ok_or_else(|| {
+                                    warp_utils::reject::custom_server_error(
+                                        "Unable to read slot clock".into(),
+                                    )
+                                })?;
 
-                        // Taking advantage of saturating subtraction on slot.
-                        let sync_distance = current_slot - head_slot;
+                            // Taking advantage of saturating subtraction on slot.
+                            let sync_distance = current_slot - head_slot;
 
-                        let is_optimistic = chain
-                            .is_optimistic_or_invalid_head()
-                            .map_err(warp_utils::reject::beacon_chain_error)?;
+                            let is_optimistic = chain
+                                .is_optimistic_or_invalid_head()
+                                .map_err(warp_utils::reject::beacon_chain_error)?;
 
-                        let syncing_data = api_types::SyncingData {
-                            is_syncing: network_globals.sync_state.read().is_syncing(),
-                            is_optimistic: Some(is_optimistic),
-                            el_offline: Some(el_offline),
-                            head_slot,
-                            sync_distance,
-                        };
+                            let syncing_data = api_types::SyncingData {
+                                is_syncing: network_globals.sync_state.read().is_syncing(),
+                                is_optimistic: Some(is_optimistic),
+                                el_offline: Some(el_offline),
+                                head_slot,
+                                sync_distance,
+                            };
 
-                        Ok(api_types::GenericResponse::from(syncing_data))
-                    })
-                    .await
+                            Ok(api_types::GenericResponse::from(syncing_data))
+                        })
+                        .await
                 }
             },
         );
@@ -2417,10 +2754,13 @@ pub fn serve<T: BeaconChainTypes>(
         .and(warp::path("node"))
         .and(warp::path("health"))
         .and(warp::path::end())
+        .and(task_spawner_filter.clone())
         .and(network_globals.clone())
         .and(chain_filter.clone())
-        .and_then(
-            |network_globals: Arc<NetworkGlobals<T::EthSpec>>, chain: Arc<BeaconChain<T>>| {
+        .then(
+            |task_spawner: TaskSpawner<T::EthSpec>,
+             network_globals: Arc<NetworkGlobals<T::EthSpec>>,
+             chain: Arc<BeaconChain<T>>| {
                 async move {
                     let el_offline = if let Some(el) = &chain.execution_layer {
                         el.is_offline_or_erroring().await
@@ -2428,28 +2768,31 @@ pub fn serve<T: BeaconChainTypes>(
                         true
                     };
 
-                    blocking_response_task(move || {
-                        let is_optimistic = chain
-                            .is_optimistic_or_invalid_head()
-                            .map_err(warp_utils::reject::beacon_chain_error)?;
+                    task_spawner
+                        .blocking_response_task(Priority::P0, move || {
+                            let is_optimistic = chain
+                                .is_optimistic_or_invalid_head()
+                                .map_err(warp_utils::reject::beacon_chain_error)?;
 
-                        let is_syncing = !network_globals.sync_state.read().is_synced();
+                            let is_syncing = !network_globals.sync_state.read().is_synced();
 
-                        if el_offline {
-                            Err(warp_utils::reject::not_synced("execution layer is offline".to_string()))
-                        } else if is_syncing || is_optimistic {
-                            Ok(warp::reply::with_status(
-                                warp::reply(),
-                                warp::http::StatusCode::PARTIAL_CONTENT,
-                            ))
-                        } else {
-                            Ok(warp::reply::with_status(
-                                warp::reply(),
-                                warp::http::StatusCode::OK,
-                            ))
-                        }
-                    })
-                    .await
+                            if el_offline {
+                                Err(warp_utils::reject::not_synced(
+                                    "execution layer is offline".to_string(),
+                                ))
+                            } else if is_syncing || is_optimistic {
+                                Ok(warp::reply::with_status(
+                                    warp::reply(),
+                                    warp::http::StatusCode::PARTIAL_CONTENT,
+                                ))
+                            } else {
+                                Ok(warp::reply::with_status(
+                                    warp::reply(),
+                                    warp::http::StatusCode::OK,
+                                ))
+                            }
+                        })
+                        .await
                 }
             },
         );
@@ -2460,10 +2803,13 @@ pub fn serve<T: BeaconChainTypes>(
         .and(warp::path("peers"))
         .and(warp::path::param::<String>())
         .and(warp::path::end())
+        .and(task_spawner_filter.clone())
         .and(network_globals.clone())
-        .and_then(
-            |requested_peer_id: String, network_globals: Arc<NetworkGlobals<T::EthSpec>>| {
-                blocking_json_task(move || {
+        .then(
+            |requested_peer_id: String,
+             task_spawner: TaskSpawner<T::EthSpec>,
+             network_globals: Arc<NetworkGlobals<T::EthSpec>>| {
+                task_spawner.blocking_json_task(Priority::P1, move || {
                     let peer_id = PeerId::from_bytes(
                         &bs58::decode(requested_peer_id.as_str())
                             .into_vec()
@@ -2517,11 +2863,13 @@ pub fn serve<T: BeaconChainTypes>(
         .and(warp::path("peers"))
         .and(warp::path::end())
         .and(multi_key_query::<api_types::PeersQuery>())
+        .and(task_spawner_filter.clone())
         .and(network_globals.clone())
-        .and_then(
+        .then(
             |query_res: Result<api_types::PeersQuery, warp::Rejection>,
+             task_spawner: TaskSpawner<T::EthSpec>,
              network_globals: Arc<NetworkGlobals<T::EthSpec>>| {
-                blocking_json_task(move || {
+                task_spawner.blocking_json_task(Priority::P1, move || {
                     let query = query_res?;
                     let mut peers: Vec<api_types::PeerData> = Vec::new();
                     network_globals
@@ -2585,38 +2933,42 @@ pub fn serve<T: BeaconChainTypes>(
         .and(warp::path("node"))
         .and(warp::path("peer_count"))
         .and(warp::path::end())
+        .and(task_spawner_filter.clone())
         .and(network_globals.clone())
-        .and_then(|network_globals: Arc<NetworkGlobals<T::EthSpec>>| {
-            blocking_json_task(move || {
-                let mut connected: u64 = 0;
-                let mut connecting: u64 = 0;
-                let mut disconnected: u64 = 0;
-                let mut disconnecting: u64 = 0;
+        .then(
+            |task_spawner: TaskSpawner<T::EthSpec>,
+             network_globals: Arc<NetworkGlobals<T::EthSpec>>| {
+                task_spawner.blocking_json_task(Priority::P1, move || {
+                    let mut connected: u64 = 0;
+                    let mut connecting: u64 = 0;
+                    let mut disconnected: u64 = 0;
+                    let mut disconnecting: u64 = 0;
 
-                network_globals
-                    .peers
-                    .read()
-                    .peers()
-                    .for_each(|(_, peer_info)| {
-                        let state = api_types::PeerState::from_peer_connection_status(
-                            peer_info.connection_status(),
-                        );
-                        match state {
-                            api_types::PeerState::Connected => connected += 1,
-                            api_types::PeerState::Connecting => connecting += 1,
-                            api_types::PeerState::Disconnected => disconnected += 1,
-                            api_types::PeerState::Disconnecting => disconnecting += 1,
-                        }
-                    });
+                    network_globals
+                        .peers
+                        .read()
+                        .peers()
+                        .for_each(|(_, peer_info)| {
+                            let state = api_types::PeerState::from_peer_connection_status(
+                                peer_info.connection_status(),
+                            );
+                            match state {
+                                api_types::PeerState::Connected => connected += 1,
+                                api_types::PeerState::Connecting => connecting += 1,
+                                api_types::PeerState::Disconnected => disconnected += 1,
+                                api_types::PeerState::Disconnecting => disconnecting += 1,
+                            }
+                        });
 
-                Ok(api_types::GenericResponse::from(api_types::PeerCount {
-                    connected,
-                    connecting,
-                    disconnected,
-                    disconnecting,
-                }))
-            })
-        });
+                    Ok(api_types::GenericResponse::from(api_types::PeerCount {
+                        connected,
+                        connecting,
+                        disconnected,
+                        disconnecting,
+                    }))
+                })
+            },
+        );
     /*
      * validator
      */
@@ -2633,11 +2985,19 @@ pub fn serve<T: BeaconChainTypes>(
         }))
         .and(warp::path::end())
         .and(not_while_syncing_filter.clone())
+        .and(task_spawner_filter.clone())
         .and(chain_filter.clone())
         .and(log_filter.clone())
-        .and_then(|epoch: Epoch, chain: Arc<BeaconChain<T>>, log: Logger| {
-            blocking_json_task(move || proposer_duties::proposer_duties(epoch, &chain, &log))
-        });
+        .then(
+            |epoch: Epoch,
+             task_spawner: TaskSpawner<T::EthSpec>,
+             chain: Arc<BeaconChain<T>>,
+             log: Logger| {
+                task_spawner.blocking_json_task(Priority::P0, move || {
+                    proposer_duties::proposer_duties(epoch, &chain, &log)
+                })
+            },
+        );
 
     // GET validator/blocks/{slot}
     let get_validator_blocks = any_version
@@ -2651,56 +3011,61 @@ pub fn serve<T: BeaconChainTypes>(
         .and(warp::path::end())
         .and(not_while_syncing_filter.clone())
         .and(warp::query::<api_types::ValidatorBlocksQuery>())
+        .and(task_spawner_filter.clone())
         .and(chain_filter.clone())
         .and(log_filter.clone())
-        .and_then(
+        .then(
             |endpoint_version: EndpointVersion,
              slot: Slot,
              query: api_types::ValidatorBlocksQuery,
+             task_spawner: TaskSpawner<T::EthSpec>,
              chain: Arc<BeaconChain<T>>,
-             log: Logger| async move {
-                debug!(
-                    log,
-                    "Block production request from HTTP API";
-                    "slot" => slot
-                );
+             log: Logger| {
+                task_spawner.spawn_async_with_rejection(Priority::P0, async move {
+                    debug!(
+                        log,
+                        "Block production request from HTTP API";
+                        "slot" => slot
+                    );
 
-                let randao_reveal = query.randao_reveal.decompress().map_err(|e| {
-                    warp_utils::reject::custom_bad_request(format!(
-                        "randao reveal is not a valid BLS signature: {:?}",
-                        e
-                    ))
-                })?;
+                    let randao_reveal = query.randao_reveal.decompress().map_err(|e| {
+                        warp_utils::reject::custom_bad_request(format!(
+                            "randao reveal is not a valid BLS signature: {:?}",
+                            e
+                        ))
+                    })?;
 
-                let randao_verification =
-                    if query.skip_randao_verification == SkipRandaoVerification::Yes {
-                        if !randao_reveal.is_infinity() {
-                            return Err(warp_utils::reject::custom_bad_request(
+                    let randao_verification =
+                        if query.skip_randao_verification == SkipRandaoVerification::Yes {
+                            if !randao_reveal.is_infinity() {
+                                return Err(warp_utils::reject::custom_bad_request(
                                 "randao_reveal must be point-at-infinity if verification is skipped"
                                     .into(),
                             ));
-                        }
-                        ProduceBlockVerification::NoVerification
-                    } else {
-                        ProduceBlockVerification::VerifyRandao
-                    };
+                            }
+                            ProduceBlockVerification::NoVerification
+                        } else {
+                            ProduceBlockVerification::VerifyRandao
+                        };
 
-                let (block, _) = chain
-                    .produce_block_with_verification::<FullPayload<T::EthSpec>>(
-                        randao_reveal,
-                        slot,
-                        query.graffiti.map(Into::into),
-                        randao_verification,
-                    )
-                    .await
-                    .map_err(warp_utils::reject::block_production_error)?;
-                let fork_name = block
-                    .to_ref()
-                    .fork_name(&chain.spec)
-                    .map_err(inconsistent_fork_rejection)?;
+                    let (block, _) = chain
+                        .produce_block_with_verification::<FullPayload<T::EthSpec>>(
+                            randao_reveal,
+                            slot,
+                            query.graffiti.map(Into::into),
+                            randao_verification,
+                        )
+                        .await
+                        .map_err(warp_utils::reject::block_production_error)?;
+                    let fork_name = block
+                        .to_ref()
+                        .fork_name(&chain.spec)
+                        .map_err(inconsistent_fork_rejection)?;
 
-                fork_versioned_response(endpoint_version, fork_name, block)
-                    .map(|response| warp::reply::json(&response).into_response())
+                    fork_versioned_response(endpoint_version, fork_name, block)
+                        .map(|response| warp::reply::json(&response).into_response())
+                        .map(|res| add_consensus_version_header(res, fork_name))
+                })
             },
         );
 
@@ -2716,48 +3081,53 @@ pub fn serve<T: BeaconChainTypes>(
         .and(warp::path::end())
         .and(not_while_syncing_filter.clone())
         .and(warp::query::<api_types::ValidatorBlocksQuery>())
+        .and(task_spawner_filter.clone())
         .and(chain_filter.clone())
-        .and_then(
+        .then(
             |slot: Slot,
              query: api_types::ValidatorBlocksQuery,
-             chain: Arc<BeaconChain<T>>| async move {
-                let randao_reveal = query.randao_reveal.decompress().map_err(|e| {
-                    warp_utils::reject::custom_bad_request(format!(
-                        "randao reveal is not a valid BLS signature: {:?}",
-                        e
-                    ))
-                })?;
+             task_spawner: TaskSpawner<T::EthSpec>,
+             chain: Arc<BeaconChain<T>>| {
+                task_spawner.spawn_async_with_rejection(Priority::P0, async move {
+                    let randao_reveal = query.randao_reveal.decompress().map_err(|e| {
+                        warp_utils::reject::custom_bad_request(format!(
+                            "randao reveal is not a valid BLS signature: {:?}",
+                            e
+                        ))
+                    })?;
 
-                let randao_verification =
-                    if query.skip_randao_verification == SkipRandaoVerification::Yes {
-                        if !randao_reveal.is_infinity() {
-                            return Err(warp_utils::reject::custom_bad_request(
+                    let randao_verification =
+                        if query.skip_randao_verification == SkipRandaoVerification::Yes {
+                            if !randao_reveal.is_infinity() {
+                                return Err(warp_utils::reject::custom_bad_request(
                                 "randao_reveal must be point-at-infinity if verification is skipped"
                                     .into()
                             ));
-                        }
-                        ProduceBlockVerification::NoVerification
-                    } else {
-                        ProduceBlockVerification::VerifyRandao
-                    };
+                            }
+                            ProduceBlockVerification::NoVerification
+                        } else {
+                            ProduceBlockVerification::VerifyRandao
+                        };
 
-                let (block, _) = chain
-                    .produce_block_with_verification::<BlindedPayload<T::EthSpec>>(
-                        randao_reveal,
-                        slot,
-                        query.graffiti.map(Into::into),
-                        randao_verification,
-                    )
-                    .await
-                    .map_err(warp_utils::reject::block_production_error)?;
-                let fork_name = block
-                    .to_ref()
-                    .fork_name(&chain.spec)
-                    .map_err(inconsistent_fork_rejection)?;
+                    let (block, _) = chain
+                        .produce_block_with_verification::<BlindedPayload<T::EthSpec>>(
+                            randao_reveal,
+                            slot,
+                            query.graffiti.map(Into::into),
+                            randao_verification,
+                        )
+                        .await
+                        .map_err(warp_utils::reject::block_production_error)?;
+                    let fork_name = block
+                        .to_ref()
+                        .fork_name(&chain.spec)
+                        .map_err(inconsistent_fork_rejection)?;
 
-                // Pose as a V2 endpoint so we return the fork `version`.
-                fork_versioned_response(V2, fork_name, block)
-                    .map(|response| warp::reply::json(&response).into_response())
+                    // Pose as a V2 endpoint so we return the fork `version`.
+                    fork_versioned_response(V2, fork_name, block)
+                        .map(|response| warp::reply::json(&response).into_response())
+                        .map(|res| add_consensus_version_header(res, fork_name))
+                })
             },
         );
 
@@ -2768,10 +3138,13 @@ pub fn serve<T: BeaconChainTypes>(
         .and(warp::path::end())
         .and(warp::query::<api_types::ValidatorAttestationDataQuery>())
         .and(not_while_syncing_filter.clone())
+        .and(task_spawner_filter.clone())
         .and(chain_filter.clone())
-        .and_then(
-            |query: api_types::ValidatorAttestationDataQuery, chain: Arc<BeaconChain<T>>| {
-                blocking_json_task(move || {
+        .then(
+            |query: api_types::ValidatorAttestationDataQuery,
+             task_spawner: TaskSpawner<T::EthSpec>,
+             chain: Arc<BeaconChain<T>>| {
+                task_spawner.blocking_json_task(Priority::P0, move || {
                     let current_slot = chain
                         .slot()
                         .map_err(warp_utils::reject::beacon_chain_error)?;
@@ -2800,10 +3173,13 @@ pub fn serve<T: BeaconChainTypes>(
         .and(warp::path::end())
         .and(warp::query::<api_types::ValidatorAggregateAttestationQuery>())
         .and(not_while_syncing_filter.clone())
+        .and(task_spawner_filter.clone())
         .and(chain_filter.clone())
-        .and_then(
-            |query: api_types::ValidatorAggregateAttestationQuery, chain: Arc<BeaconChain<T>>| {
-                blocking_json_task(move || {
+        .then(
+            |query: api_types::ValidatorAggregateAttestationQuery,
+             task_spawner: TaskSpawner<T::EthSpec>,
+             chain: Arc<BeaconChain<T>>| {
+                task_spawner.blocking_json_task(Priority::P0, move || {
                     chain
                         .get_aggregated_attestation_by_slot_and_root(
                             query.slot,
@@ -2838,16 +3214,20 @@ pub fn serve<T: BeaconChainTypes>(
         .and(warp::path::end())
         .and(not_while_syncing_filter.clone())
         .and(warp::body::json())
+        .and(task_spawner_filter.clone())
         .and(chain_filter.clone())
-        .and_then(
-            |epoch: Epoch, indices: api_types::ValidatorIndexData, chain: Arc<BeaconChain<T>>| {
-                blocking_json_task(move || {
+        .then(
+            |epoch: Epoch,
+             indices: api_types::ValidatorIndexData,
+             task_spawner: TaskSpawner<T::EthSpec>,
+             chain: Arc<BeaconChain<T>>| {
+                task_spawner.blocking_json_task(Priority::P0, move || {
                     attester_duties::attester_duties(epoch, &indices.0, &chain)
                 })
             },
         );
 
-    // POST validator/duties/sync
+    // POST validator/duties/sync/{epoch}
     let post_validator_duties_sync = eth_v1
         .and(warp::path("validator"))
         .and(warp::path("duties"))
@@ -2860,10 +3240,14 @@ pub fn serve<T: BeaconChainTypes>(
         .and(warp::path::end())
         .and(not_while_syncing_filter.clone())
         .and(warp::body::json())
+        .and(task_spawner_filter.clone())
         .and(chain_filter.clone())
-        .and_then(
-            |epoch: Epoch, indices: api_types::ValidatorIndexData, chain: Arc<BeaconChain<T>>| {
-                blocking_json_task(move || {
+        .then(
+            |epoch: Epoch,
+             indices: api_types::ValidatorIndexData,
+             task_spawner: TaskSpawner<T::EthSpec>,
+             chain: Arc<BeaconChain<T>>| {
+                task_spawner.blocking_json_task(Priority::P0, move || {
                     sync_committees::sync_committee_duties(epoch, &indices.0, &chain)
                 })
             },
@@ -2876,10 +3260,13 @@ pub fn serve<T: BeaconChainTypes>(
         .and(warp::path::end())
         .and(warp::query::<SyncContributionData>())
         .and(not_while_syncing_filter.clone())
+        .and(task_spawner_filter.clone())
         .and(chain_filter.clone())
-        .and_then(
-            |sync_committee_data: SyncContributionData, chain: Arc<BeaconChain<T>>| {
-                blocking_json_task(move || {
+        .then(
+            |sync_committee_data: SyncContributionData,
+             task_spawner: TaskSpawner<T::EthSpec>,
+             chain: Arc<BeaconChain<T>>| {
+                task_spawner.blocking_json_task(Priority::P0, move || {
                     chain
                         .get_aggregated_sync_committee_contribution(&sync_committee_data)
                         .map_err(|e| {
@@ -2904,15 +3291,17 @@ pub fn serve<T: BeaconChainTypes>(
         .and(warp::path("aggregate_and_proofs"))
         .and(warp::path::end())
         .and(not_while_syncing_filter.clone())
+        .and(task_spawner_filter.clone())
         .and(chain_filter.clone())
         .and(warp::body::json())
         .and(network_tx_filter.clone())
         .and(log_filter.clone())
-        .and_then(
-            |chain: Arc<BeaconChain<T>>,
+        .then(
+            |task_spawner: TaskSpawner<T::EthSpec>,
+             chain: Arc<BeaconChain<T>>,
              aggregates: Vec<SignedAggregateAndProof<T::EthSpec>>,
              network_tx: UnboundedSender<NetworkMessage<T::EthSpec>>, log: Logger| {
-                blocking_json_task(move || {
+                task_spawner.blocking_json_task(Priority::P0, move || {
                     let seen_timestamp = timestamp_now();
                     let mut verified_aggregates = Vec::with_capacity(aggregates.len());
                     let mut messages = Vec::with_capacity(aggregates.len());
@@ -3015,16 +3404,18 @@ pub fn serve<T: BeaconChainTypes>(
         .and(warp::path("contribution_and_proofs"))
         .and(warp::path::end())
         .and(not_while_syncing_filter.clone())
+        .and(task_spawner_filter.clone())
         .and(chain_filter.clone())
         .and(warp::body::json())
         .and(network_tx_filter)
         .and(log_filter.clone())
-        .and_then(
-            |chain: Arc<BeaconChain<T>>,
+        .then(
+            |task_spawner: TaskSpawner<T::EthSpec>,
+             chain: Arc<BeaconChain<T>>,
              contributions: Vec<SignedContributionAndProof<T::EthSpec>>,
              network_tx: UnboundedSender<NetworkMessage<T::EthSpec>>,
              log: Logger| {
-                blocking_json_task(move || {
+                task_spawner.blocking_json_task(Priority::P0, move || {
                     sync_committees::process_signed_contribution_and_proofs(
                         contributions,
                         network_tx,
@@ -3043,14 +3434,16 @@ pub fn serve<T: BeaconChainTypes>(
         .and(warp::path::end())
         .and(warp::body::json())
         .and(validator_subscription_tx_filter.clone())
+        .and(task_spawner_filter.clone())
         .and(chain_filter.clone())
         .and(log_filter.clone())
-        .and_then(
+        .then(
             |subscriptions: Vec<api_types::BeaconCommitteeSubscription>,
              validator_subscription_tx: Sender<ValidatorSubscriptionMessage>,
+             task_spawner: TaskSpawner<T::EthSpec>,
              chain: Arc<BeaconChain<T>>,
              log: Logger| {
-                blocking_json_task(move || {
+                task_spawner.blocking_json_task(Priority::P0, move || {
                     for subscription in &subscriptions {
                         chain
                             .validator_monitor
@@ -3092,45 +3485,49 @@ pub fn serve<T: BeaconChainTypes>(
         .and(warp::path("prepare_beacon_proposer"))
         .and(warp::path::end())
         .and(not_while_syncing_filter.clone())
+        .and(task_spawner_filter.clone())
         .and(chain_filter.clone())
         .and(log_filter.clone())
         .and(warp::body::json())
-        .and_then(
-            |chain: Arc<BeaconChain<T>>,
+        .then(
+            |task_spawner: TaskSpawner<T::EthSpec>,
+             chain: Arc<BeaconChain<T>>,
              log: Logger,
-             preparation_data: Vec<ProposerPreparationData>| async move {
-                let execution_layer = chain
-                    .execution_layer
-                    .as_ref()
-                    .ok_or(BeaconChainError::ExecutionLayerMissing)
-                    .map_err(warp_utils::reject::beacon_chain_error)?;
+             preparation_data: Vec<ProposerPreparationData>| {
+                task_spawner.spawn_async_with_rejection(Priority::P0, async move {
+                    let execution_layer = chain
+                        .execution_layer
+                        .as_ref()
+                        .ok_or(BeaconChainError::ExecutionLayerMissing)
+                        .map_err(warp_utils::reject::beacon_chain_error)?;
 
-                let current_slot = chain
-                    .slot()
-                    .map_err(warp_utils::reject::beacon_chain_error)?;
-                let current_epoch = current_slot.epoch(T::EthSpec::slots_per_epoch());
+                    let current_slot = chain
+                        .slot()
+                        .map_err(warp_utils::reject::beacon_chain_error)?;
+                    let current_epoch = current_slot.epoch(T::EthSpec::slots_per_epoch());
 
-                debug!(
-                    log,
-                    "Received proposer preparation data";
-                    "count" => preparation_data.len(),
-                );
+                    debug!(
+                        log,
+                        "Received proposer preparation data";
+                        "count" => preparation_data.len(),
+                    );
 
-                execution_layer
-                    .update_proposer_preparation(current_epoch, &preparation_data)
-                    .await;
+                    execution_layer
+                        .update_proposer_preparation(current_epoch, &preparation_data)
+                        .await;
 
-                chain
-                    .prepare_beacon_proposer(current_slot)
-                    .await
-                    .map_err(|e| {
-                        warp_utils::reject::custom_bad_request(format!(
-                            "error updating proposer preparations: {:?}",
-                            e
-                        ))
-                    })?;
+                    chain
+                        .prepare_beacon_proposer(current_slot)
+                        .await
+                        .map_err(|e| {
+                            warp_utils::reject::custom_bad_request(format!(
+                                "error updating proposer preparations: {:?}",
+                                e
+                            ))
+                        })?;
 
-                Ok::<_, warp::reject::Rejection>(warp::reply::json(&()).into_response())
+                    Ok::<_, warp::reject::Rejection>(warp::reply::json(&()).into_response())
+                })
             },
         );
 
@@ -3139,127 +3536,176 @@ pub fn serve<T: BeaconChainTypes>(
         .and(warp::path("validator"))
         .and(warp::path("register_validator"))
         .and(warp::path::end())
+        .and(task_spawner_filter.clone())
         .and(chain_filter.clone())
         .and(log_filter.clone())
         .and(warp::body::json())
-        .and_then(
-            |chain: Arc<BeaconChain<T>>,
+        .then(
+            |task_spawner: TaskSpawner<T::EthSpec>,
+             chain: Arc<BeaconChain<T>>,
              log: Logger,
-             register_val_data: Vec<SignedValidatorRegistrationData>| async move {
-                let execution_layer = chain
-                    .execution_layer
-                    .as_ref()
-                    .ok_or(BeaconChainError::ExecutionLayerMissing)
-                    .map_err(warp_utils::reject::beacon_chain_error)?;
-                let current_slot = chain
-                    .slot_clock
-                    .now_or_genesis()
-                    .ok_or(BeaconChainError::UnableToReadSlot)
-                    .map_err(warp_utils::reject::beacon_chain_error)?;
-                let current_epoch = current_slot.epoch(T::EthSpec::slots_per_epoch());
+             register_val_data: Vec<SignedValidatorRegistrationData>| async {
+                let (tx, rx) = oneshot::channel();
 
-                debug!(
-                    log,
-                    "Received register validator request";
-                    "count" => register_val_data.len(),
-                );
+                let initial_result = task_spawner
+                    .spawn_async_with_rejection_no_conversion(Priority::P0, async move {
+                        let execution_layer = chain
+                            .execution_layer
+                            .as_ref()
+                            .ok_or(BeaconChainError::ExecutionLayerMissing)
+                            .map_err(warp_utils::reject::beacon_chain_error)?;
+                        let current_slot = chain
+                            .slot_clock
+                            .now_or_genesis()
+                            .ok_or(BeaconChainError::UnableToReadSlot)
+                            .map_err(warp_utils::reject::beacon_chain_error)?;
+                        let current_epoch = current_slot.epoch(T::EthSpec::slots_per_epoch());
 
-                let head_snapshot = chain.head_snapshot();
-                let spec = &chain.spec;
+                        debug!(
+                            log,
+                            "Received register validator request";
+                            "count" => register_val_data.len(),
+                        );
 
-                let (preparation_data, filtered_registration_data): (
-                    Vec<ProposerPreparationData>,
-                    Vec<SignedValidatorRegistrationData>,
-                ) = register_val_data
-                    .into_iter()
-                    .filter_map(|register_data| {
-                        chain
-                            .validator_index(&register_data.message.pubkey)
-                            .ok()
-                            .flatten()
-                            .and_then(|validator_index| {
-                                let validator = head_snapshot
-                                    .beacon_state
-                                    .get_validator(validator_index)
-                                    .ok()?;
-                                let validator_status = ValidatorStatus::from_validator(
-                                    validator,
-                                    current_epoch,
-                                    spec.far_future_epoch,
-                                )
-                                .superstatus();
-                                let is_active_or_pending =
-                                    matches!(validator_status, ValidatorStatus::Pending)
-                                        || matches!(validator_status, ValidatorStatus::Active);
+                        let head_snapshot = chain.head_snapshot();
+                        let spec = &chain.spec;
 
-                                // Filter out validators who are not 'active' or 'pending'.
-                                is_active_or_pending.then_some({
-                                    (
-                                        ProposerPreparationData {
-                                            validator_index: validator_index as u64,
-                                            fee_recipient: register_data.message.fee_recipient,
-                                        },
-                                        register_data,
-                                    )
-                                })
+                        let (preparation_data, filtered_registration_data): (
+                            Vec<ProposerPreparationData>,
+                            Vec<SignedValidatorRegistrationData>,
+                        ) = register_val_data
+                            .into_iter()
+                            .filter_map(|register_data| {
+                                chain
+                                    .validator_index(&register_data.message.pubkey)
+                                    .ok()
+                                    .flatten()
+                                    .and_then(|validator_index| {
+                                        let validator = head_snapshot
+                                            .beacon_state
+                                            .get_validator(validator_index)
+                                            .ok()?;
+                                        let validator_status = ValidatorStatus::from_validator(
+                                            validator,
+                                            current_epoch,
+                                            spec.far_future_epoch,
+                                        )
+                                        .superstatus();
+                                        let is_active_or_pending =
+                                            matches!(validator_status, ValidatorStatus::Pending)
+                                                || matches!(
+                                                    validator_status,
+                                                    ValidatorStatus::Active
+                                                );
+
+                                        // Filter out validators who are not 'active' or 'pending'.
+                                        is_active_or_pending.then_some({
+                                            (
+                                                ProposerPreparationData {
+                                                    validator_index: validator_index as u64,
+                                                    fee_recipient: register_data
+                                                        .message
+                                                        .fee_recipient,
+                                                },
+                                                register_data,
+                                            )
+                                        })
+                                    })
                             })
-                    })
-                    .unzip();
+                            .unzip();
 
-                // Update the prepare beacon proposer cache based on this request.
-                execution_layer
-                    .update_proposer_preparation(current_epoch, &preparation_data)
+                        // Update the prepare beacon proposer cache based on this request.
+                        execution_layer
+                            .update_proposer_preparation(current_epoch, &preparation_data)
+                            .await;
+
+                        // Call prepare beacon proposer blocking with the latest update in order to make
+                        // sure we have a local payload to fall back to in the event of the blinded block
+                        // flow failing.
+                        chain
+                            .prepare_beacon_proposer(current_slot)
+                            .await
+                            .map_err(|e| {
+                                warp_utils::reject::custom_bad_request(format!(
+                                    "error updating proposer preparations: {:?}",
+                                    e
+                                ))
+                            })?;
+
+                        info!(
+                            log,
+                            "Forwarding register validator request to connected builder";
+                            "count" => filtered_registration_data.len(),
+                        );
+
+                        // It's a waste of a `BeaconProcessor` worker to just
+                        // wait on a response from the builder (especially since
+                        // they have frequent timeouts). Spawn a new task and
+                        // send the response back to our original HTTP request
+                        // task via a channel.
+                        let builder_future = async move {
+                            let builder = chain
+                                .execution_layer
+                                .as_ref()
+                                .ok_or(BeaconChainError::ExecutionLayerMissing)
+                                .map_err(warp_utils::reject::beacon_chain_error)?
+                                .builder()
+                                .as_ref()
+                                .ok_or(BeaconChainError::BuilderMissing)
+                                .map_err(warp_utils::reject::beacon_chain_error)?;
+
+                            builder
+                                .post_builder_validators(&filtered_registration_data)
+                                .await
+                                .map(|resp| warp::reply::json(&resp).into_response())
+                                .map_err(|e| {
+                                    warn!(
+                                        log,
+                                        "Relay error when registering validator(s)";
+                                        "num_registrations" => filtered_registration_data.len(),
+                                        "error" => ?e
+                                    );
+                                    // Forward the HTTP status code if we are able to, otherwise fall back
+                                    // to a server error.
+                                    if let eth2::Error::ServerMessage(message) = e {
+                                        if message.code == StatusCode::BAD_REQUEST.as_u16() {
+                                            return warp_utils::reject::custom_bad_request(
+                                                message.message,
+                                            );
+                                        } else {
+                                            // According to the spec this response should only be a 400 or 500,
+                                            // so we fall back to a 500 here.
+                                            return warp_utils::reject::custom_server_error(
+                                                message.message,
+                                            );
+                                        }
+                                    }
+                                    warp_utils::reject::custom_server_error(format!("{e:?}"))
+                                })
+                        };
+                        tokio::task::spawn(async move { tx.send(builder_future.await) });
+
+                        // Just send a generic 200 OK from this closure. We'll
+                        // ignore the `Ok` variant and form a proper response
+                        // from what is sent back down the channel.
+                        Ok(warp::reply::reply().into_response())
+                    })
                     .await;
 
-                // Call prepare beacon proposer blocking with the latest update in order to make
-                // sure we have a local payload to fall back to in the event of the blinded block
-                // flow failing.
-                chain
-                    .prepare_beacon_proposer(current_slot)
-                    .await
-                    .map_err(|e| {
-                        warp_utils::reject::custom_bad_request(format!(
-                            "error updating proposer preparations: {:?}",
-                            e
-                        ))
-                    })?;
+                if initial_result.is_err() {
+                    return task_spawner::convert_rejection(initial_result).await;
+                }
 
-                let builder = execution_layer
-                    .builder()
-                    .as_ref()
-                    .ok_or(BeaconChainError::BuilderMissing)
-                    .map_err(warp_utils::reject::beacon_chain_error)?;
-
-                info!(
-                    log,
-                    "Forwarding register validator request to connected builder";
-                    "count" => filtered_registration_data.len(),
-                );
-
-                builder
-                    .post_builder_validators(&filtered_registration_data)
-                    .await
-                    .map(|resp| warp::reply::json(&resp).into_response())
-                    .map_err(|e| {
-                        warn!(
-                            log,
-                            "Relay error when registering validator(s)";
-                            "num_registrations" => filtered_registration_data.len(),
-                            "error" => ?e
-                        );
-                        // Forward the HTTP status code if we are able to, otherwise fall back
-                        // to a server error.
-                        if let eth2::Error::ServerMessage(message) = e {
-                            if message.code == StatusCode::BAD_REQUEST.as_u16() {
-                                return warp_utils::reject::custom_bad_request(message.message);
-                            } else {
-                                // According to the spec this response should only be a 400 or 500,
-                                // so we fall back to a 500 here.
-                                return warp_utils::reject::custom_server_error(message.message);
-                            }
-                        }
-                        warp_utils::reject::custom_server_error(format!("{e:?}"))
-                    })
+                // Await a response from the builder without blocking a
+                // `BeaconProcessor` worker.
+                task_spawner::convert_rejection(rx.await.unwrap_or_else(|_| {
+                    Ok(warp::reply::with_status(
+                        warp::reply::json(&"No response from channel"),
+                        eth2::StatusCode::INTERNAL_SERVER_ERROR,
+                    )
+                    .into_response())
+                }))
+                .await
             },
         );
     // POST validator/sync_committee_subscriptions
@@ -3269,15 +3715,17 @@ pub fn serve<T: BeaconChainTypes>(
         .and(warp::path::end())
         .and(warp::body::json())
         .and(validator_subscription_tx_filter)
+        .and(task_spawner_filter.clone())
         .and(chain_filter.clone())
         .and(log_filter.clone())
-        .and_then(
+        .then(
             |subscriptions: Vec<types::SyncCommitteeSubscription>,
              validator_subscription_tx: Sender<ValidatorSubscriptionMessage>,
+             task_spawner: TaskSpawner<T::EthSpec>,
              chain: Arc<BeaconChain<T>>,
              log: Logger
              | {
-                blocking_json_task(move || {
+                task_spawner.blocking_json_task(Priority::P0, move || {
                     for subscription in subscriptions {
                         chain
                             .validator_monitor
@@ -3305,15 +3753,61 @@ pub fn serve<T: BeaconChainTypes>(
             },
         );
 
+    // POST vaidator/liveness/{epoch}
+    let post_validator_liveness_epoch = eth_v1
+        .and(warp::path("validator"))
+        .and(warp::path("liveness"))
+        .and(warp::path::param::<Epoch>())
+        .and(warp::path::end())
+        .and(warp::body::json())
+        .and(task_spawner_filter.clone())
+        .and(chain_filter.clone())
+        .then(
+            |epoch: Epoch,
+             indices: Vec<u64>,
+             task_spawner: TaskSpawner<T::EthSpec>,
+             chain: Arc<BeaconChain<T>>| {
+                task_spawner.blocking_json_task(Priority::P0, move || {
+                    // Ensure the request is for either the current, previous or next epoch.
+                    let current_epoch = chain
+                        .epoch()
+                        .map_err(warp_utils::reject::beacon_chain_error)?;
+                    let prev_epoch = current_epoch.saturating_sub(Epoch::new(1));
+                    let next_epoch = current_epoch.saturating_add(Epoch::new(1));
+
+                    if epoch < prev_epoch || epoch > next_epoch {
+                        return Err(warp_utils::reject::custom_bad_request(format!(
+                            "request epoch {} is more than one epoch from the current epoch {}",
+                            epoch, current_epoch
+                        )));
+                    }
+
+                    let liveness: Vec<api_types::StandardLivenessResponseData> = indices
+                        .iter()
+                        .cloned()
+                        .map(|index| {
+                            let is_live = chain.validator_seen_at_epoch(index as usize, epoch);
+                            api_types::StandardLivenessResponseData { index, is_live }
+                        })
+                        .collect();
+
+                    Ok(api_types::GenericResponse::from(liveness))
+                })
+            },
+        );
+
     // POST lighthouse/liveness
     let post_lighthouse_liveness = warp::path("lighthouse")
         .and(warp::path("liveness"))
         .and(warp::path::end())
         .and(warp::body::json())
+        .and(task_spawner_filter.clone())
         .and(chain_filter.clone())
-        .and_then(
-            |request_data: api_types::LivenessRequestData, chain: Arc<BeaconChain<T>>| {
-                blocking_json_task(move || {
+        .then(
+            |request_data: api_types::LivenessRequestData,
+             task_spawner: TaskSpawner<T::EthSpec>,
+             chain: Arc<BeaconChain<T>>| {
+                task_spawner.blocking_json_task(Priority::P0, move || {
                     // Ensure the request is for either the current, previous or next epoch.
                     let current_epoch = chain
                         .epoch()
@@ -3352,8 +3846,9 @@ pub fn serve<T: BeaconChainTypes>(
     let get_lighthouse_health = warp::path("lighthouse")
         .and(warp::path("health"))
         .and(warp::path::end())
-        .and_then(|| {
-            blocking_json_task(move || {
+        .and(task_spawner_filter.clone())
+        .then(|task_spawner: TaskSpawner<T::EthSpec>| {
+            task_spawner.blocking_json_task(Priority::P0, move || {
                 eth2::lighthouse::Health::observe()
                     .map(api_types::GenericResponse::from)
                     .map_err(warp_utils::reject::custom_bad_request)
@@ -3365,13 +3860,18 @@ pub fn serve<T: BeaconChainTypes>(
         .and(warp::path("ui"))
         .and(warp::path("health"))
         .and(warp::path::end())
+        .and(task_spawner_filter.clone())
         .and(system_info_filter)
         .and(app_start_filter)
         .and(data_dir_filter)
         .and(network_globals.clone())
-        .and_then(
-            |sysinfo, app_start: std::time::Instant, data_dir, network_globals| {
-                blocking_json_task(move || {
+        .then(
+            |task_spawner: TaskSpawner<T::EthSpec>,
+             sysinfo,
+             app_start: std::time::Instant,
+             data_dir,
+             network_globals| {
+                task_spawner.blocking_json_task(Priority::P0, move || {
                     let app_uptime = app_start.elapsed().as_secs();
                     Ok(api_types::GenericResponse::from(observe_system_health_bn(
                         sysinfo,
@@ -3388,12 +3888,15 @@ pub fn serve<T: BeaconChainTypes>(
         .and(warp::path("ui"))
         .and(warp::path("validator_count"))
         .and(warp::path::end())
+        .and(task_spawner_filter.clone())
         .and(chain_filter.clone())
-        .and_then(|chain: Arc<BeaconChain<T>>| {
-            blocking_json_task(move || {
-                ui::get_validator_count(chain).map(api_types::GenericResponse::from)
-            })
-        });
+        .then(
+            |task_spawner: TaskSpawner<T::EthSpec>, chain: Arc<BeaconChain<T>>| {
+                task_spawner.blocking_json_task(Priority::P1, move || {
+                    ui::get_validator_count(chain).map(api_types::GenericResponse::from)
+                })
+            },
+        );
 
     // POST lighthouse/ui/validator_metrics
     let post_lighthouse_ui_validator_metrics = warp::path("lighthouse")
@@ -3401,10 +3904,13 @@ pub fn serve<T: BeaconChainTypes>(
         .and(warp::path("validator_metrics"))
         .and(warp::path::end())
         .and(warp::body::json())
+        .and(task_spawner_filter.clone())
         .and(chain_filter.clone())
-        .and_then(
-            |request_data: ui::ValidatorMetricsRequestData, chain: Arc<BeaconChain<T>>| {
-                blocking_json_task(move || {
+        .then(
+            |request_data: ui::ValidatorMetricsRequestData,
+             task_spawner: TaskSpawner<T::EthSpec>,
+             chain: Arc<BeaconChain<T>>| {
+                task_spawner.blocking_json_task(Priority::P1, move || {
                     ui::post_validator_monitor_metrics(request_data, chain)
                         .map(api_types::GenericResponse::from)
                 })
@@ -3417,10 +3923,13 @@ pub fn serve<T: BeaconChainTypes>(
         .and(warp::path("validator_info"))
         .and(warp::path::end())
         .and(warp::body::json())
+        .and(task_spawner_filter.clone())
         .and(chain_filter.clone())
-        .and_then(
-            |request_data: ui::ValidatorInfoRequestData, chain: Arc<BeaconChain<T>>| {
-                blocking_json_task(move || {
+        .then(
+            |request_data: ui::ValidatorInfoRequestData,
+             task_spawner: TaskSpawner<T::EthSpec>,
+             chain: Arc<BeaconChain<T>>| {
+                task_spawner.blocking_json_task(Priority::P1, move || {
                     ui::get_validator_info(request_data, chain)
                         .map(api_types::GenericResponse::from)
                 })
@@ -3431,21 +3940,26 @@ pub fn serve<T: BeaconChainTypes>(
     let get_lighthouse_syncing = warp::path("lighthouse")
         .and(warp::path("syncing"))
         .and(warp::path::end())
+        .and(task_spawner_filter.clone())
         .and(network_globals.clone())
-        .and_then(|network_globals: Arc<NetworkGlobals<T::EthSpec>>| {
-            blocking_json_task(move || {
-                Ok(api_types::GenericResponse::from(
-                    network_globals.sync_state(),
-                ))
-            })
-        });
+        .then(
+            |task_spawner: TaskSpawner<T::EthSpec>,
+             network_globals: Arc<NetworkGlobals<T::EthSpec>>| {
+                task_spawner.blocking_json_task(Priority::P0, move || {
+                    Ok(api_types::GenericResponse::from(
+                        network_globals.sync_state(),
+                    ))
+                })
+            },
+        );
 
     // GET lighthouse/nat
     let get_lighthouse_nat = warp::path("lighthouse")
         .and(warp::path("nat"))
+        .and(task_spawner_filter.clone())
         .and(warp::path::end())
-        .and_then(|| {
-            blocking_json_task(move || {
+        .then(|task_spawner: TaskSpawner<T::EthSpec>| {
+            task_spawner.blocking_json_task(Priority::P1, move || {
                 Ok(api_types::GenericResponse::from(
                     lighthouse_network::metrics::NAT_OPEN
                         .as_ref()
@@ -3460,57 +3974,70 @@ pub fn serve<T: BeaconChainTypes>(
     let get_lighthouse_peers = warp::path("lighthouse")
         .and(warp::path("peers"))
         .and(warp::path::end())
+        .and(task_spawner_filter.clone())
         .and(network_globals.clone())
-        .and_then(|network_globals: Arc<NetworkGlobals<T::EthSpec>>| {
-            blocking_json_task(move || {
-                Ok(network_globals
-                    .peers
-                    .read()
-                    .peers()
-                    .map(|(peer_id, peer_info)| eth2::lighthouse::Peer {
-                        peer_id: peer_id.to_string(),
-                        peer_info: peer_info.clone(),
-                    })
-                    .collect::<Vec<_>>())
-            })
-        });
+        .then(
+            |task_spawner: TaskSpawner<T::EthSpec>,
+             network_globals: Arc<NetworkGlobals<T::EthSpec>>| {
+                task_spawner.blocking_json_task(Priority::P1, move || {
+                    Ok(network_globals
+                        .peers
+                        .read()
+                        .peers()
+                        .map(|(peer_id, peer_info)| eth2::lighthouse::Peer {
+                            peer_id: peer_id.to_string(),
+                            peer_info: peer_info.clone(),
+                        })
+                        .collect::<Vec<_>>())
+                })
+            },
+        );
 
     // GET lighthouse/peers/connected
     let get_lighthouse_peers_connected = warp::path("lighthouse")
         .and(warp::path("peers"))
         .and(warp::path("connected"))
         .and(warp::path::end())
+        .and(task_spawner_filter.clone())
         .and(network_globals)
-        .and_then(|network_globals: Arc<NetworkGlobals<T::EthSpec>>| {
-            blocking_json_task(move || {
-                Ok(network_globals
-                    .peers
-                    .read()
-                    .connected_peers()
-                    .map(|(peer_id, peer_info)| eth2::lighthouse::Peer {
-                        peer_id: peer_id.to_string(),
-                        peer_info: peer_info.clone(),
-                    })
-                    .collect::<Vec<_>>())
-            })
-        });
+        .then(
+            |task_spawner: TaskSpawner<T::EthSpec>,
+             network_globals: Arc<NetworkGlobals<T::EthSpec>>| {
+                task_spawner.blocking_json_task(Priority::P1, move || {
+                    Ok(network_globals
+                        .peers
+                        .read()
+                        .connected_peers()
+                        .map(|(peer_id, peer_info)| eth2::lighthouse::Peer {
+                            peer_id: peer_id.to_string(),
+                            peer_info: peer_info.clone(),
+                        })
+                        .collect::<Vec<_>>())
+                })
+            },
+        );
 
     // GET lighthouse/proto_array
     let get_lighthouse_proto_array = warp::path("lighthouse")
         .and(warp::path("proto_array"))
         .and(warp::path::end())
+        .and(task_spawner_filter.clone())
         .and(chain_filter.clone())
-        .and_then(|chain: Arc<BeaconChain<T>>| {
-            blocking_response_task(move || {
-                Ok::<_, warp::Rejection>(warp::reply::json(&api_types::GenericResponseRef::from(
-                    chain
-                        .canonical_head
-                        .fork_choice_read_lock()
-                        .proto_array()
-                        .core_proto_array(),
-                )))
-            })
-        });
+        .then(
+            |task_spawner: TaskSpawner<T::EthSpec>, chain: Arc<BeaconChain<T>>| {
+                task_spawner.blocking_response_task(Priority::P1, move || {
+                    Ok::<_, warp::Rejection>(warp::reply::json(
+                        &api_types::GenericResponseRef::from(
+                            chain
+                                .canonical_head
+                                .fork_choice_read_lock()
+                                .proto_array()
+                                .core_proto_array(),
+                        ),
+                    ))
+                })
+            },
+        );
 
     // GET lighthouse/validator_inclusion/{epoch}/{validator_id}
     let get_lighthouse_validator_inclusion_global = warp::path("lighthouse")
@@ -3518,10 +4045,14 @@ pub fn serve<T: BeaconChainTypes>(
         .and(warp::path::param::<Epoch>())
         .and(warp::path::param::<ValidatorId>())
         .and(warp::path::end())
+        .and(task_spawner_filter.clone())
         .and(chain_filter.clone())
-        .and_then(
-            |epoch: Epoch, validator_id: ValidatorId, chain: Arc<BeaconChain<T>>| {
-                blocking_json_task(move || {
+        .then(
+            |epoch: Epoch,
+             validator_id: ValidatorId,
+             task_spawner: TaskSpawner<T::EthSpec>,
+             chain: Arc<BeaconChain<T>>| {
+                task_spawner.blocking_json_task(Priority::P1, move || {
                     validator_inclusion::validator_inclusion_data(epoch, &validator_id, &chain)
                         .map(api_types::GenericResponse::from)
                 })
@@ -3534,82 +4065,94 @@ pub fn serve<T: BeaconChainTypes>(
         .and(warp::path::param::<Epoch>())
         .and(warp::path("global"))
         .and(warp::path::end())
+        .and(task_spawner_filter.clone())
         .and(chain_filter.clone())
-        .and_then(|epoch: Epoch, chain: Arc<BeaconChain<T>>| {
-            blocking_json_task(move || {
-                validator_inclusion::global_validator_inclusion_data(epoch, &chain)
-                    .map(api_types::GenericResponse::from)
-            })
-        });
+        .then(
+            |epoch: Epoch, task_spawner: TaskSpawner<T::EthSpec>, chain: Arc<BeaconChain<T>>| {
+                task_spawner.blocking_json_task(Priority::P1, move || {
+                    validator_inclusion::global_validator_inclusion_data(epoch, &chain)
+                        .map(api_types::GenericResponse::from)
+                })
+            },
+        );
 
     // GET lighthouse/eth1/syncing
     let get_lighthouse_eth1_syncing = warp::path("lighthouse")
         .and(warp::path("eth1"))
         .and(warp::path("syncing"))
         .and(warp::path::end())
+        .and(task_spawner_filter.clone())
         .and(chain_filter.clone())
-        .and_then(|chain: Arc<BeaconChain<T>>| {
-            blocking_json_task(move || {
-                let current_slot_opt = chain.slot().ok();
+        .then(
+            |task_spawner: TaskSpawner<T::EthSpec>, chain: Arc<BeaconChain<T>>| {
+                task_spawner.blocking_json_task(Priority::P1, move || {
+                    let current_slot_opt = chain.slot().ok();
 
-                chain
-                    .eth1_chain
-                    .as_ref()
-                    .ok_or_else(|| {
-                        warp_utils::reject::custom_not_found(
-                            "Eth1 sync is disabled. See the --eth1 CLI flag.".to_string(),
-                        )
-                    })
-                    .and_then(|eth1| {
-                        eth1.sync_status(chain.genesis_time, current_slot_opt, &chain.spec)
-                            .ok_or_else(|| {
-                                warp_utils::reject::custom_server_error(
-                                    "Unable to determine Eth1 sync status".to_string(),
-                                )
-                            })
-                    })
-                    .map(api_types::GenericResponse::from)
-            })
-        });
+                    chain
+                        .eth1_chain
+                        .as_ref()
+                        .ok_or_else(|| {
+                            warp_utils::reject::custom_not_found(
+                                "Eth1 sync is disabled. See the --eth1 CLI flag.".to_string(),
+                            )
+                        })
+                        .and_then(|eth1| {
+                            eth1.sync_status(chain.genesis_time, current_slot_opt, &chain.spec)
+                                .ok_or_else(|| {
+                                    warp_utils::reject::custom_server_error(
+                                        "Unable to determine Eth1 sync status".to_string(),
+                                    )
+                                })
+                        })
+                        .map(api_types::GenericResponse::from)
+                })
+            },
+        );
 
     // GET lighthouse/eth1/block_cache
     let get_lighthouse_eth1_block_cache = warp::path("lighthouse")
         .and(warp::path("eth1"))
         .and(warp::path("block_cache"))
         .and(warp::path::end())
+        .and(task_spawner_filter.clone())
         .and(eth1_service_filter.clone())
-        .and_then(|eth1_service: eth1::Service| {
-            blocking_json_task(move || {
-                Ok(api_types::GenericResponse::from(
-                    eth1_service
-                        .blocks()
-                        .read()
-                        .iter()
-                        .cloned()
-                        .collect::<Vec<_>>(),
-                ))
-            })
-        });
+        .then(
+            |task_spawner: TaskSpawner<T::EthSpec>, eth1_service: eth1::Service| {
+                task_spawner.blocking_json_task(Priority::P1, move || {
+                    Ok(api_types::GenericResponse::from(
+                        eth1_service
+                            .blocks()
+                            .read()
+                            .iter()
+                            .cloned()
+                            .collect::<Vec<_>>(),
+                    ))
+                })
+            },
+        );
 
     // GET lighthouse/eth1/deposit_cache
     let get_lighthouse_eth1_deposit_cache = warp::path("lighthouse")
         .and(warp::path("eth1"))
         .and(warp::path("deposit_cache"))
         .and(warp::path::end())
+        .and(task_spawner_filter.clone())
         .and(eth1_service_filter)
-        .and_then(|eth1_service: eth1::Service| {
-            blocking_json_task(move || {
-                Ok(api_types::GenericResponse::from(
-                    eth1_service
-                        .deposits()
-                        .read()
-                        .cache
-                        .iter()
-                        .cloned()
-                        .collect::<Vec<_>>(),
-                ))
-            })
-        });
+        .then(
+            |task_spawner: TaskSpawner<T::EthSpec>, eth1_service: eth1::Service| {
+                task_spawner.blocking_json_task(Priority::P1, move || {
+                    Ok(api_types::GenericResponse::from(
+                        eth1_service
+                            .deposits()
+                            .read()
+                            .cache
+                            .iter()
+                            .cloned()
+                            .collect::<Vec<_>>(),
+                    ))
+                })
+            },
+        );
 
     // GET lighthouse/beacon/states/{state_id}/ssz
     let get_lighthouse_beacon_states_ssz = warp::path("lighthouse")
@@ -3618,42 +4161,50 @@ pub fn serve<T: BeaconChainTypes>(
         .and(warp::path::param::<StateId>())
         .and(warp::path("ssz"))
         .and(warp::path::end())
+        .and(task_spawner_filter.clone())
         .and(chain_filter.clone())
-        .and_then(|state_id: StateId, chain: Arc<BeaconChain<T>>| {
-            blocking_response_task(move || {
-                // This debug endpoint provides no indication of optimistic status.
-                let (state, _execution_optimistic, _finalized) = state_id.state(&chain)?;
-                Response::builder()
-                    .status(200)
-                    .header("Content-Type", "application/ssz")
-                    .body(state.as_ssz_bytes())
-                    .map_err(|e| {
-                        warp_utils::reject::custom_server_error(format!(
-                            "failed to create response: {}",
-                            e
-                        ))
-                    })
-            })
-        });
+        .then(
+            |state_id: StateId,
+             task_spawner: TaskSpawner<T::EthSpec>,
+             chain: Arc<BeaconChain<T>>| {
+                task_spawner.blocking_response_task(Priority::P1, move || {
+                    // This debug endpoint provides no indication of optimistic status.
+                    let (state, _execution_optimistic, _finalized) = state_id.state(&chain)?;
+                    Response::builder()
+                        .status(200)
+                        .header("Content-Type", "application/ssz")
+                        .body(state.as_ssz_bytes())
+                        .map_err(|e| {
+                            warp_utils::reject::custom_server_error(format!(
+                                "failed to create response: {}",
+                                e
+                            ))
+                        })
+                })
+            },
+        );
 
     // GET lighthouse/staking
     let get_lighthouse_staking = warp::path("lighthouse")
         .and(warp::path("staking"))
         .and(warp::path::end())
+        .and(task_spawner_filter.clone())
         .and(chain_filter.clone())
-        .and_then(|chain: Arc<BeaconChain<T>>| {
-            blocking_json_task(move || {
-                if chain.eth1_chain.is_some() {
-                    Ok(())
-                } else {
-                    Err(warp_utils::reject::custom_not_found(
-                        "staking is not enabled, \
+        .then(
+            |task_spawner: TaskSpawner<T::EthSpec>, chain: Arc<BeaconChain<T>>| {
+                task_spawner.blocking_json_task(Priority::P1, move || {
+                    if chain.eth1_chain.is_some() {
+                        Ok(())
+                    } else {
+                        Err(warp_utils::reject::custom_not_found(
+                            "staking is not enabled, \
                         see the --staking CLI flag"
-                            .to_string(),
-                    ))
-                }
-            })
-        });
+                                .to_string(),
+                        ))
+                    }
+                })
+            },
+        );
 
     let database_path = warp::path("lighthouse").and(warp::path("database"));
 
@@ -3661,31 +4212,41 @@ pub fn serve<T: BeaconChainTypes>(
     let get_lighthouse_database_info = database_path
         .and(warp::path("info"))
         .and(warp::path::end())
+        .and(task_spawner_filter.clone())
         .and(chain_filter.clone())
-        .and_then(|chain: Arc<BeaconChain<T>>| blocking_json_task(move || database::info(chain)));
+        .then(
+            |task_spawner: TaskSpawner<T::EthSpec>, chain: Arc<BeaconChain<T>>| {
+                task_spawner.blocking_json_task(Priority::P1, move || database::info(chain))
+            },
+        );
 
     // POST lighthouse/database/reconstruct
     let post_lighthouse_database_reconstruct = database_path
         .and(warp::path("reconstruct"))
         .and(warp::path::end())
         .and(not_while_syncing_filter)
+        .and(task_spawner_filter.clone())
         .and(chain_filter.clone())
-        .and_then(|chain: Arc<BeaconChain<T>>| {
-            blocking_json_task(move || {
-                chain.store_migrator.process_reconstruction();
-                Ok("success")
-            })
-        });
+        .then(
+            |task_spawner: TaskSpawner<T::EthSpec>, chain: Arc<BeaconChain<T>>| {
+                task_spawner.blocking_json_task(Priority::P1, move || {
+                    chain.store_migrator.process_reconstruction();
+                    Ok("success")
+                })
+            },
+        );
 
     // POST lighthouse/database/historical_blocks
     let post_lighthouse_database_historical_blocks = database_path
         .and(warp::path("historical_blocks"))
         .and(warp::path::end())
         .and(warp::body::json())
+        .and(task_spawner_filter.clone())
         .and(chain_filter.clone())
         .and(log_filter.clone())
-        .and_then(
+        .then(
             |blocks: Vec<Arc<SignedBlindedBeaconBlock<T::EthSpec>>>,
+             task_spawner: TaskSpawner<T::EthSpec>,
              chain: Arc<BeaconChain<T>>,
              log: Logger| {
                 info!(
@@ -3694,7 +4255,9 @@ pub fn serve<T: BeaconChainTypes>(
                     "count" => blocks.len(),
                     "source" => "http_api"
                 );
-                blocking_json_task(move || database::historical_blocks(chain, blocks))
+                task_spawner.blocking_json_task(Priority::P1, move || {
+                    database::historical_blocks(chain, blocks)
+                })
             },
         );
 
@@ -3704,10 +4267,13 @@ pub fn serve<T: BeaconChainTypes>(
         .and(warp::path("block_rewards"))
         .and(warp::query::<eth2::lighthouse::BlockRewardsQuery>())
         .and(warp::path::end())
+        .and(task_spawner_filter.clone())
         .and(chain_filter.clone())
         .and(log_filter.clone())
-        .and_then(|query, chain, log| {
-            blocking_json_task(move || block_rewards::get_block_rewards(query, chain, log))
+        .then(|query, task_spawner: TaskSpawner<T::EthSpec>, chain, log| {
+            task_spawner.blocking_json_task(Priority::P1, move || {
+                block_rewards::get_block_rewards(query, chain, log)
+            })
         });
 
     // POST lighthouse/analysis/block_rewards
@@ -3716,11 +4282,16 @@ pub fn serve<T: BeaconChainTypes>(
         .and(warp::path("block_rewards"))
         .and(warp::body::json())
         .and(warp::path::end())
+        .and(task_spawner_filter.clone())
         .and(chain_filter.clone())
         .and(log_filter.clone())
-        .and_then(|blocks, chain, log| {
-            blocking_json_task(move || block_rewards::compute_block_rewards(blocks, chain, log))
-        });
+        .then(
+            |blocks, task_spawner: TaskSpawner<T::EthSpec>, chain, log| {
+                task_spawner.blocking_json_task(Priority::P1, move || {
+                    block_rewards::compute_block_rewards(blocks, chain, log)
+                })
+            },
+        );
 
     // GET lighthouse/analysis/attestation_performance/{index}
     let get_lighthouse_attestation_performance = warp::path("lighthouse")
@@ -3729,12 +4300,15 @@ pub fn serve<T: BeaconChainTypes>(
         .and(warp::path::param::<String>())
         .and(warp::query::<eth2::lighthouse::AttestationPerformanceQuery>())
         .and(warp::path::end())
+        .and(task_spawner_filter.clone())
         .and(chain_filter.clone())
-        .and_then(|target, query, chain: Arc<BeaconChain<T>>| {
-            blocking_json_task(move || {
-                attestation_performance::get_attestation_performance(target, query, chain)
-            })
-        });
+        .then(
+            |target, query, task_spawner: TaskSpawner<T::EthSpec>, chain: Arc<BeaconChain<T>>| {
+                task_spawner.blocking_json_task(Priority::P1, move || {
+                    attestation_performance::get_attestation_performance(target, query, chain)
+                })
+            },
+        );
 
     // GET lighthouse/analysis/block_packing_efficiency
     let get_lighthouse_block_packing_efficiency = warp::path("lighthouse")
@@ -3742,35 +4316,45 @@ pub fn serve<T: BeaconChainTypes>(
         .and(warp::path("block_packing_efficiency"))
         .and(warp::query::<eth2::lighthouse::BlockPackingEfficiencyQuery>())
         .and(warp::path::end())
+        .and(task_spawner_filter.clone())
         .and(chain_filter.clone())
-        .and_then(|query, chain: Arc<BeaconChain<T>>| {
-            blocking_json_task(move || {
-                block_packing_efficiency::get_block_packing_efficiency(query, chain)
-            })
-        });
+        .then(
+            |query, task_spawner: TaskSpawner<T::EthSpec>, chain: Arc<BeaconChain<T>>| {
+                task_spawner.blocking_json_task(Priority::P1, move || {
+                    block_packing_efficiency::get_block_packing_efficiency(query, chain)
+                })
+            },
+        );
 
     // GET lighthouse/merge_readiness
     let get_lighthouse_merge_readiness = warp::path("lighthouse")
         .and(warp::path("merge_readiness"))
         .and(warp::path::end())
+        .and(task_spawner_filter.clone())
         .and(chain_filter.clone())
-        .and_then(|chain: Arc<BeaconChain<T>>| async move {
-            let merge_readiness = chain.check_merge_readiness().await;
-            Ok::<_, warp::reject::Rejection>(
-                warp::reply::json(&api_types::GenericResponse::from(merge_readiness))
-                    .into_response(),
-            )
-        });
+        .then(
+            |task_spawner: TaskSpawner<T::EthSpec>, chain: Arc<BeaconChain<T>>| {
+                task_spawner.spawn_async_with_rejection(Priority::P1, async move {
+                    let merge_readiness = chain.check_merge_readiness().await;
+                    Ok::<_, warp::reject::Rejection>(
+                        warp::reply::json(&api_types::GenericResponse::from(merge_readiness))
+                            .into_response(),
+                    )
+                })
+            },
+        );
 
     let get_events = eth_v1
         .and(warp::path("events"))
         .and(warp::path::end())
         .and(multi_key_query::<api_types::EventQuery>())
+        .and(task_spawner_filter.clone())
         .and(chain_filter)
-        .and_then(
+        .then(
             |topics_res: Result<api_types::EventQuery, warp::Rejection>,
+             task_spawner: TaskSpawner<T::EthSpec>,
              chain: Arc<BeaconChain<T>>| {
-                blocking_response_task(move || {
+                task_spawner.blocking_response_task(Priority::P0, move || {
                     let topics = topics_res?;
                     // for each topic subscribed spawn a new subscription
                     let mut receivers = Vec::with_capacity(topics.topics.len());
@@ -3806,22 +4390,29 @@ pub fn serve<T: BeaconChainTypes>(
                                 }
                             };
 
-                            receivers.push(BroadcastStream::new(receiver).map(|msg| {
-                                match msg {
-                                    Ok(data) => Event::default()
-                                        .event(data.topic_name())
-                                        .json_data(data)
-                                        .map_err(|e| {
-                                            warp_utils::reject::server_sent_event_error(format!(
-                                                "{:?}",
-                                                e
-                                            ))
-                                        }),
-                                    Err(e) => Err(warp_utils::reject::server_sent_event_error(
-                                        format!("{:?}", e),
-                                    )),
-                                }
-                            }));
+                            receivers.push(
+                                BroadcastStream::new(receiver)
+                                    .map(|msg| {
+                                        match msg {
+                                            Ok(data) => Event::default()
+                                                .event(data.topic_name())
+                                                .json_data(data)
+                                                .unwrap_or_else(|e| {
+                                                    Event::default()
+                                                        .comment(format!("error - bad json: {e:?}"))
+                                                }),
+                                            // Do not terminate the stream if the channel fills
+                                            // up. Just drop some messages and send a comment to
+                                            // the client.
+                                            Err(BroadcastStreamRecvError::Lagged(n)) => {
+                                                Event::default().comment(format!(
+                                                    "error - dropped {n} messages"
+                                                ))
+                                            }
+                                        }
+                                    })
+                                    .map(Ok::<_, std::convert::Infallible>),
+                            );
                         }
                     } else {
                         return Err(warp_utils::reject::custom_server_error(
@@ -3831,7 +4422,7 @@ pub fn serve<T: BeaconChainTypes>(
 
                     let s = futures::stream::select_all(receivers);
 
-                    Ok::<_, warp::Rejection>(warp::sse::reply(warp::sse::keep_alive().stream(s)))
+                    Ok(warp::sse::reply(warp::sse::keep_alive().stream(s)))
                 })
             },
         );
@@ -3841,38 +4432,46 @@ pub fn serve<T: BeaconChainTypes>(
     let lighthouse_log_events = warp::path("lighthouse")
         .and(warp::path("logs"))
         .and(warp::path::end())
+        .and(task_spawner_filter)
         .and(sse_component_filter)
-        .and_then(|sse_component: Option<SSELoggingComponents>| {
-            blocking_response_task(move || {
-                if let Some(logging_components) = sse_component {
-                    // Build a JSON stream
-                    let s =
-                        BroadcastStream::new(logging_components.sender.subscribe()).map(|msg| {
-                            match msg {
-                                Ok(data) => {
-                                    // Serialize to json
-                                    match data.to_json_string() {
-                                        // Send the json as a Server Side Event
-                                        Ok(json) => Ok(Event::default().data(json)),
-                                        Err(e) => Err(warp_utils::reject::server_sent_event_error(
-                                            format!("Unable to serialize to JSON {}", e),
-                                        )),
+        .then(
+            |task_spawner: TaskSpawner<T::EthSpec>, sse_component: Option<SSELoggingComponents>| {
+                task_spawner.blocking_response_task(Priority::P1, move || {
+                    if let Some(logging_components) = sse_component {
+                        // Build a JSON stream
+                        let s = BroadcastStream::new(logging_components.sender.subscribe()).map(
+                            |msg| {
+                                match msg {
+                                    Ok(data) => {
+                                        // Serialize to json
+                                        match data.to_json_string() {
+                                            // Send the json as a Server Side Event
+                                            Ok(json) => Ok(Event::default().data(json)),
+                                            Err(e) => {
+                                                Err(warp_utils::reject::server_sent_event_error(
+                                                    format!("Unable to serialize to JSON {}", e),
+                                                ))
+                                            }
+                                        }
                                     }
+                                    Err(e) => Err(warp_utils::reject::server_sent_event_error(
+                                        format!("Unable to receive event {}", e),
+                                    )),
                                 }
-                                Err(e) => Err(warp_utils::reject::server_sent_event_error(
-                                    format!("Unable to receive event {}", e),
-                                )),
-                            }
-                        });
+                            },
+                        );
 
-                    Ok::<_, warp::Rejection>(warp::sse::reply(warp::sse::keep_alive().stream(s)))
-                } else {
-                    Err(warp_utils::reject::custom_server_error(
-                        "SSE Logging is not enabled".to_string(),
-                    ))
-                }
-            })
-        });
+                        Ok::<_, warp::Rejection>(warp::sse::reply(
+                            warp::sse::keep_alive().stream(s),
+                        ))
+                    } else {
+                        Err(warp_utils::reject::custom_server_error(
+                            "SSE Logging is not enabled".to_string(),
+                        ))
+                    }
+                })
+            },
+        );
 
     // Define the ultimate set of routes that will be provided to the server.
     // Use `uor` rather than `or` in order to simplify types (see `UnifyingOrFilter`).
@@ -3941,13 +4540,22 @@ pub fn serve<T: BeaconChainTypes>(
                 .uor(get_lighthouse_block_packing_efficiency)
                 .uor(get_lighthouse_merge_readiness)
                 .uor(get_events)
+                .uor(get_expected_withdrawals)
                 .uor(lighthouse_log_events.boxed())
                 .recover(warp_utils::reject::handle_rejection),
         )
         .boxed()
         .uor(
             warp::post().and(
-                post_beacon_blocks
+                warp::header::exact("Content-Type", "application/octet-stream")
+                    // Routes which expect `application/octet-stream` go within this `and`.
+                    .and(
+                        post_beacon_blocks_ssz
+                            .uor(post_beacon_blocks_v2_ssz)
+                            .uor(post_beacon_blinded_blocks_ssz)
+                            .uor(post_beacon_blinded_blocks_v2_ssz),
+                    )
+                    .uor(post_beacon_blocks)
                     .uor(post_beacon_blinded_blocks)
                     .uor(post_beacon_blocks_v2)
                     .uor(post_beacon_blinded_blocks_v2)
@@ -3967,6 +4575,7 @@ pub fn serve<T: BeaconChainTypes>(
                     .uor(post_validator_sync_committee_subscriptions)
                     .uor(post_validator_prepare_beacon_proposer)
                     .uor(post_validator_register_validator)
+                    .uor(post_validator_liveness_epoch)
                     .uor(post_lighthouse_liveness)
                     .uor(post_lighthouse_database_reconstruct)
                     .uor(post_lighthouse_database_historical_blocks)
diff --git a/beacon_node/http_api/src/proposer_duties.rs b/beacon_node/http_api/src/proposer_duties.rs
index 7e946b89e7..708df39b4d 100644
--- a/beacon_node/http_api/src/proposer_duties.rs
+++ b/beacon_node/http_api/src/proposer_duties.rs
@@ -3,7 +3,7 @@
 use crate::state_id::StateId;
 use beacon_chain::{
     beacon_proposer_cache::{compute_proposer_duties_from_head, ensure_state_is_in_epoch},
-    BeaconChain, BeaconChainError, BeaconChainTypes, MAXIMUM_GOSSIP_CLOCK_DISPARITY,
+    BeaconChain, BeaconChainError, BeaconChainTypes,
 };
 use eth2::types::{self as api_types};
 use safe_arith::SafeArith;
@@ -33,7 +33,7 @@ pub fn proposer_duties<T: BeaconChainTypes>(
     // will equal `current_epoch + 1`
     let tolerant_current_epoch = chain
         .slot_clock
-        .now_with_future_tolerance(MAXIMUM_GOSSIP_CLOCK_DISPARITY)
+        .now_with_future_tolerance(chain.spec.maximum_gossip_clock_disparity())
         .ok_or_else(|| warp_utils::reject::custom_server_error("unable to read slot clock".into()))?
         .epoch(T::EthSpec::slots_per_epoch());
 
diff --git a/beacon_node/http_api/src/publish_blocks.rs b/beacon_node/http_api/src/publish_blocks.rs
index 0f2f7b361c..58524f0698 100644
--- a/beacon_node/http_api/src/publish_blocks.rs
+++ b/beacon_node/http_api/src/publish_blocks.rs
@@ -4,7 +4,7 @@ use beacon_chain::{
     BeaconChain, BeaconChainError, BeaconChainTypes, BlockError, IntoGossipVerifiedBlock,
     NotifyExecutionLayer,
 };
-use eth2::types::BroadcastValidation;
+use eth2::types::{BroadcastValidation, ErrorMessage};
 use execution_layer::ProvenancedPayload;
 use lighthouse_network::PubsubMessage;
 use network::NetworkMessage;
@@ -19,7 +19,8 @@ use types::{
     AbstractExecPayload, BeaconBlockRef, BlindedPayload, EthSpec, ExecPayload, ExecutionBlockHash,
     FullPayload, Hash256, SignedBeaconBlock,
 };
-use warp::Rejection;
+use warp::http::StatusCode;
+use warp::{reply::Response, Rejection, Reply};
 
 pub enum ProvenancedBlock<T: BeaconChainTypes, B: IntoGossipVerifiedBlock<T>> {
     /// The payload was built using a local EE.
@@ -47,7 +48,8 @@ pub async fn publish_block<T: BeaconChainTypes, B: IntoGossipVerifiedBlock<T>>(
     network_tx: &UnboundedSender<NetworkMessage<T::EthSpec>>,
     log: Logger,
     validation_level: BroadcastValidation,
-) -> Result<(), Rejection> {
+    duplicate_status_code: StatusCode,
+) -> Result<Response, Rejection> {
     let seen_timestamp = timestamp_now();
     let (block, is_locally_built_block) = match provenanced_block {
         ProvenancedBlock::Local(block, _) => (block, true),
@@ -75,10 +77,30 @@ pub async fn publish_block<T: BeaconChainTypes, B: IntoGossipVerifiedBlock<T>>(
     };
 
     /* if we can form a `GossipVerifiedBlock`, we've passed our basic gossip checks */
-    let gossip_verified_block = block.into_gossip_verified_block(&chain).map_err(|e| {
-        warn!(log, "Not publishing block, not gossip verified"; "slot" => beacon_block.slot(), "error" => ?e);
-        warp_utils::reject::custom_bad_request(e.to_string())
-    })?;
+    let gossip_verified_block = match block.into_gossip_verified_block(&chain) {
+        Ok(b) => b,
+        Err(BlockError::BlockIsAlreadyKnown) => {
+            // Allow the status code for duplicate blocks to be overridden based on config.
+            return Ok(warp::reply::with_status(
+                warp::reply::json(&ErrorMessage {
+                    code: duplicate_status_code.as_u16(),
+                    message: "duplicate block".to_string(),
+                    stacktraces: vec![],
+                }),
+                duplicate_status_code,
+            )
+            .into_response());
+        }
+        Err(e) => {
+            warn!(
+                log,
+                "Not publishing block - not gossip verified";
+                "slot" => beacon_block.slot(),
+                "error" => ?e
+            );
+            return Err(warp_utils::reject::custom_bad_request(e.to_string()));
+        }
+    };
 
     let block_root = block_root.unwrap_or(gossip_verified_block.block_root);
 
@@ -167,8 +189,7 @@ pub async fn publish_block<T: BeaconChainTypes, B: IntoGossipVerifiedBlock<T>>(
                     &log,
                 )
             }
-
-            Ok(())
+            Ok(warp::reply().into_response())
         }
         Err(BlockError::BeaconChainError(BeaconChainError::UnableToPublish)) => {
             Err(warp_utils::reject::custom_server_error(
@@ -178,10 +199,6 @@ pub async fn publish_block<T: BeaconChainTypes, B: IntoGossipVerifiedBlock<T>>(
         Err(BlockError::Slashable) => Err(warp_utils::reject::custom_bad_request(
             "proposal for this slot and proposer has already been seen".to_string(),
         )),
-        Err(BlockError::BlockIsAlreadyKnown) => {
-            info!(log, "Block from HTTP API already known"; "block" => ?block_root);
-            Ok(())
-        }
         Err(e) => {
             if let BroadcastValidation::Gossip = validation_level {
                 Err(warp_utils::reject::broadcast_without_import(format!("{e}")))
@@ -208,7 +225,8 @@ pub async fn publish_blinded_block<T: BeaconChainTypes>(
     network_tx: &UnboundedSender<NetworkMessage<T::EthSpec>>,
     log: Logger,
     validation_level: BroadcastValidation,
-) -> Result<(), Rejection> {
+    duplicate_status_code: StatusCode,
+) -> Result<Response, Rejection> {
     let block_root = block.canonical_root();
     let full_block: ProvenancedBlock<T, Arc<SignedBeaconBlock<T::EthSpec>>> =
         reconstruct_block(chain.clone(), block_root, block, log.clone()).await?;
@@ -219,6 +237,7 @@ pub async fn publish_blinded_block<T: BeaconChainTypes>(
         network_tx,
         log,
         validation_level,
+        duplicate_status_code,
     )
     .await
 }
diff --git a/beacon_node/http_api/src/state_id.rs b/beacon_node/http_api/src/state_id.rs
index 9e4aadef17..1a76333e2d 100644
--- a/beacon_node/http_api/src/state_id.rs
+++ b/beacon_node/http_api/src/state_id.rs
@@ -70,15 +70,30 @@ impl StateId {
                     .map_err(BeaconChainError::DBError)
                     .map_err(warp_utils::reject::beacon_chain_error)?
                 {
-                    let execution_optimistic = chain
-                        .canonical_head
-                        .fork_choice_read_lock()
-                        .is_optimistic_or_invalid_block_no_fallback(&hot_summary.latest_block_root)
-                        .map_err(BeaconChainError::ForkChoiceError)
-                        .map_err(warp_utils::reject::beacon_chain_error)?;
-                    let finalized = chain
-                        .is_finalized_state(root, hot_summary.slot)
+                    let finalization_status = chain
+                        .state_finalization_and_canonicity(root, hot_summary.slot)
                         .map_err(warp_utils::reject::beacon_chain_error)?;
+                    let finalized = finalization_status.is_finalized();
+                    let fork_choice = chain.canonical_head.fork_choice_read_lock();
+                    let execution_optimistic = if finalization_status.slot_is_finalized
+                        && !finalization_status.canonical
+                    {
+                        // This block is permanently orphaned and has likely been pruned from fork
+                        // choice. If it isn't found in fork choice, mark it optimistic to be on the
+                        // safe side.
+                        fork_choice
+                            .is_optimistic_or_invalid_block_no_fallback(
+                                &hot_summary.latest_block_root,
+                            )
+                            .unwrap_or(true)
+                    } else {
+                        // This block is either old and finalized, or recent and unfinalized, so
+                        // it's safe to fallback to the optimistic status of the finalized block.
+                        fork_choice
+                            .is_optimistic_or_invalid_block(&hot_summary.latest_block_root)
+                            .map_err(BeaconChainError::ForkChoiceError)
+                            .map_err(warp_utils::reject::beacon_chain_error)?
+                    };
                     return Ok((*root, execution_optimistic, finalized));
                 } else if let Some(_cold_state_slot) = chain
                     .store
diff --git a/beacon_node/http_api/src/sync_committees.rs b/beacon_node/http_api/src/sync_committees.rs
index 07dfb5c988..dcf41429f6 100644
--- a/beacon_node/http_api/src/sync_committees.rs
+++ b/beacon_node/http_api/src/sync_committees.rs
@@ -6,7 +6,7 @@ use beacon_chain::sync_committee_verification::{
 };
 use beacon_chain::{
     validator_monitor::timestamp_now, BeaconChain, BeaconChainError, BeaconChainTypes,
-    StateSkipConfig, MAXIMUM_GOSSIP_CLOCK_DISPARITY,
+    StateSkipConfig,
 };
 use eth2::types::{self as api_types};
 use lighthouse_network::PubsubMessage;
@@ -85,7 +85,7 @@ fn duties_from_state_load<T: BeaconChainTypes>(
     let current_epoch = chain.epoch()?;
     let tolerant_current_epoch = chain
         .slot_clock
-        .now_with_future_tolerance(MAXIMUM_GOSSIP_CLOCK_DISPARITY)
+        .now_with_future_tolerance(chain.spec.maximum_gossip_clock_disparity())
         .ok_or(BeaconChainError::UnableToReadSlot)?
         .epoch(T::EthSpec::slots_per_epoch());
 
diff --git a/beacon_node/http_api/src/task_spawner.rs b/beacon_node/http_api/src/task_spawner.rs
new file mode 100644
index 0000000000..8768e057da
--- /dev/null
+++ b/beacon_node/http_api/src/task_spawner.rs
@@ -0,0 +1,192 @@
+use beacon_processor::{BeaconProcessorSend, BlockingOrAsync, Work, WorkEvent};
+use serde::Serialize;
+use std::future::Future;
+use tokio::sync::{mpsc::error::TrySendError, oneshot};
+use types::EthSpec;
+use warp::reply::{Reply, Response};
+
+/// Maps a request to a queue in the `BeaconProcessor`.
+#[derive(Clone, Copy)]
+pub enum Priority {
+    /// The highest priority.
+    P0,
+    /// The lowest priority.
+    P1,
+}
+
+impl Priority {
+    /// Wrap `self` in a `WorkEvent` with an appropriate priority.
+    fn work_event<E: EthSpec>(&self, process_fn: BlockingOrAsync) -> WorkEvent<E> {
+        let work = match self {
+            Priority::P0 => Work::ApiRequestP0(process_fn),
+            Priority::P1 => Work::ApiRequestP1(process_fn),
+        };
+        WorkEvent {
+            drop_during_sync: false,
+            work,
+        }
+    }
+}
+
+/// Spawns tasks on the `BeaconProcessor` or directly on the tokio executor.
+pub struct TaskSpawner<E: EthSpec> {
+    /// Used to send tasks to the `BeaconProcessor`. The tokio executor will be
+    /// used if this is `None`.
+    beacon_processor_send: Option<BeaconProcessorSend<E>>,
+}
+
+/// Convert a warp `Rejection` into a `Response`.
+///
+/// This function should *always* be used to convert rejections into responses. This prevents warp
+/// from trying to backtrack in strange ways. See: https://github.com/sigp/lighthouse/issues/3404
+pub async fn convert_rejection<T: Reply>(res: Result<T, warp::Rejection>) -> Response {
+    match res {
+        Ok(response) => response.into_response(),
+        Err(e) => match warp_utils::reject::handle_rejection(e).await {
+            Ok(reply) => reply.into_response(),
+            Err(_) => warp::reply::with_status(
+                warp::reply::json(&"unhandled error"),
+                eth2::StatusCode::INTERNAL_SERVER_ERROR,
+            )
+            .into_response(),
+        },
+    }
+}
+
+impl<E: EthSpec> TaskSpawner<E> {
+    pub fn new(beacon_processor_send: Option<BeaconProcessorSend<E>>) -> Self {
+        Self {
+            beacon_processor_send,
+        }
+    }
+
+    /// Executes a "blocking" (non-async) task which returns a `Response`.
+    pub async fn blocking_response_task<F, T>(self, priority: Priority, func: F) -> Response
+    where
+        F: FnOnce() -> Result<T, warp::Rejection> + Send + Sync + 'static,
+        T: Reply + Send + 'static,
+    {
+        if let Some(beacon_processor_send) = &self.beacon_processor_send {
+            // Create a closure that will execute `func` and send the result to
+            // a channel held by this thread.
+            let (tx, rx) = oneshot::channel();
+            let process_fn = move || {
+                // Execute the function, collect the return value.
+                let func_result = func();
+                // Send the result down the channel. Ignore any failures; the
+                // send can only fail if the receiver is dropped.
+                let _ = tx.send(func_result);
+            };
+
+            // Send the function to the beacon processor for execution at some arbitrary time.
+            let result = send_to_beacon_processor(
+                beacon_processor_send,
+                priority,
+                BlockingOrAsync::Blocking(Box::new(process_fn)),
+                rx,
+            )
+            .await
+            .and_then(|x| x);
+            convert_rejection(result).await
+        } else {
+            // There is no beacon processor so spawn a task directly on the
+            // tokio executor.
+            convert_rejection(warp_utils::task::blocking_response_task(func).await).await
+        }
+    }
+
+    /// Executes a "blocking" (non-async) task which returns a JSON-serializable
+    /// object.
+    pub async fn blocking_json_task<F, T>(self, priority: Priority, func: F) -> Response
+    where
+        F: FnOnce() -> Result<T, warp::Rejection> + Send + Sync + 'static,
+        T: Serialize + Send + 'static,
+    {
+        let func = || func().map(|t| warp::reply::json(&t).into_response());
+        self.blocking_response_task(priority, func).await
+    }
+
+    /// Executes an async task which may return a `Rejection`, which will be converted to a response.
+    pub async fn spawn_async_with_rejection(
+        self,
+        priority: Priority,
+        func: impl Future<Output = Result<Response, warp::Rejection>> + Send + Sync + 'static,
+    ) -> Response {
+        let result = self
+            .spawn_async_with_rejection_no_conversion(priority, func)
+            .await;
+        convert_rejection(result).await
+    }
+
+    /// Same as `spawn_async_with_rejection` but returning a result with the unhandled rejection.
+    ///
+    /// If you call this function you MUST convert the rejection to a response and not let it
+    /// propagate into Warp's filters. See `convert_rejection`.
+    pub async fn spawn_async_with_rejection_no_conversion(
+        self,
+        priority: Priority,
+        func: impl Future<Output = Result<Response, warp::Rejection>> + Send + Sync + 'static,
+    ) -> Result<Response, warp::Rejection> {
+        if let Some(beacon_processor_send) = &self.beacon_processor_send {
+            // Create a wrapper future that will execute `func` and send the
+            // result to a channel held by this thread.
+            let (tx, rx) = oneshot::channel();
+            let process_fn = async move {
+                // Await the future, collect the return value.
+                let func_result = func.await;
+                // Send the result down the channel. Ignore any failures; the
+                // send can only fail if the receiver is dropped.
+                let _ = tx.send(func_result);
+            };
+
+            // Send the function to the beacon processor for execution at some arbitrary time.
+            send_to_beacon_processor(
+                beacon_processor_send,
+                priority,
+                BlockingOrAsync::Async(Box::pin(process_fn)),
+                rx,
+            )
+            .await
+            .and_then(|x| x)
+        } else {
+            // There is no beacon processor so spawn a task directly on the
+            // tokio executor.
+            tokio::task::spawn(func)
+                .await
+                .map_err(|_| {
+                    warp_utils::reject::custom_server_error("Tokio failed to spawn task".into())
+                })
+                .and_then(|x| x)
+        }
+    }
+}
+
+/// Send a task to the beacon processor and await execution.
+///
+/// If the task is not executed, return an `Err` with an error message
+/// for the API consumer.
+async fn send_to_beacon_processor<E: EthSpec, T>(
+    beacon_processor_send: &BeaconProcessorSend<E>,
+    priority: Priority,
+    process_fn: BlockingOrAsync,
+    rx: oneshot::Receiver<T>,
+) -> Result<T, warp::Rejection> {
+    let error_message = match beacon_processor_send.try_send(priority.work_event(process_fn)) {
+        Ok(()) => {
+            match rx.await {
+                // The beacon processor executed the task and sent a result.
+                Ok(func_result) => return Ok(func_result),
+                // The beacon processor dropped the channel without sending a
+                // result. The beacon processor dropped this task because its
+                // queues are full or it's shutting down.
+                Err(_) => "The task did not execute. The server is overloaded or shutting down.",
+            }
+        }
+        Err(TrySendError::Full(_)) => "The task was dropped. The server is overloaded.",
+        Err(TrySendError::Closed(_)) => "The task was dropped. The server is shutting down.",
+    };
+
+    Err(warp_utils::reject::custom_server_error(
+        error_message.to_string(),
+    ))
+}
diff --git a/beacon_node/http_api/src/test_utils.rs b/beacon_node/http_api/src/test_utils.rs
index 9880a8ca61..33834d58ca 100644
--- a/beacon_node/http_api/src/test_utils.rs
+++ b/beacon_node/http_api/src/test_utils.rs
@@ -5,16 +5,14 @@ use beacon_chain::{
     },
     BeaconChain, BeaconChainTypes,
 };
+use beacon_processor::{BeaconProcessor, BeaconProcessorChannels, BeaconProcessorConfig};
 use directory::DEFAULT_ROOT_DIR;
 use eth2::{BeaconNodeHttpClient, Timeouts};
 use lighthouse_network::{
     discv5::enr::{CombinedKey, EnrBuilder},
-    libp2p::{
-        core::connection::ConnectionId,
-        swarm::{
-            behaviour::{ConnectionEstablished, FromSwarm},
-            NetworkBehaviour,
-        },
+    libp2p::swarm::{
+        behaviour::{ConnectionEstablished, FromSwarm},
+        ConnectionId, NetworkBehaviour,
     },
     rpc::methods::{MetaData, MetaDataV2},
     types::{EnrAttestationBitfield, EnrSyncCommitteeBitfield, SyncState},
@@ -25,11 +23,11 @@ use network::{NetworkReceivers, NetworkSenders};
 use sensitive_url::SensitiveUrl;
 use slog::Logger;
 use std::future::Future;
-use std::net::{IpAddr, Ipv4Addr, SocketAddr};
+use std::net::SocketAddr;
 use std::sync::Arc;
 use std::time::Duration;
 use store::MemoryStore;
-use tokio::sync::oneshot;
+use task_executor::test_utils::TestRuntime;
 use types::{ChainSpec, EthSpec};
 
 pub const TCP_PORT: u16 = 42;
@@ -42,7 +40,6 @@ pub struct InteractiveTester<E: EthSpec> {
     pub harness: BeaconChainHarness<EphemeralHarnessType<E>>,
     pub client: BeaconNodeHttpClient,
     pub network_rx: NetworkReceivers<E>,
-    _server_shutdown: oneshot::Sender<()>,
 }
 
 /// The result of calling `create_api_server`.
@@ -51,7 +48,6 @@ pub struct InteractiveTester<E: EthSpec> {
 pub struct ApiServer<E: EthSpec, SFut: Future<Output = ()>> {
     pub server: SFut,
     pub listening_socket: SocketAddr,
-    pub shutdown_tx: oneshot::Sender<()>,
     pub network_rx: NetworkReceivers<E>,
     pub local_enr: Enr,
     pub external_peer_id: PeerId,
@@ -99,10 +95,14 @@ impl<E: EthSpec> InteractiveTester<E> {
         let ApiServer {
             server,
             listening_socket,
-            shutdown_tx: _server_shutdown,
             network_rx,
             ..
-        } = create_api_server(harness.chain.clone(), harness.logger().clone()).await;
+        } = create_api_server(
+            harness.chain.clone(),
+            &harness.runtime,
+            harness.logger().clone(),
+        )
+        .await;
 
         tokio::spawn(server);
 
@@ -120,22 +120,23 @@ impl<E: EthSpec> InteractiveTester<E> {
             harness,
             client,
             network_rx,
-            _server_shutdown,
         }
     }
 }
 
 pub async fn create_api_server<T: BeaconChainTypes>(
     chain: Arc<BeaconChain<T>>,
+    test_runtime: &TestRuntime,
     log: Logger,
 ) -> ApiServer<T::EthSpec, impl Future<Output = ()>> {
     // Get a random unused port.
     let port = unused_port::unused_tcp4_port().unwrap();
-    create_api_server_on_port(chain, log, port).await
+    create_api_server_on_port(chain, test_runtime, log, port).await
 }
 
 pub async fn create_api_server_on_port<T: BeaconChainTypes>(
     chain: Arc<BeaconChain<T>>,
+    test_runtime: &TestRuntime,
     log: Logger,
     port: u16,
 ) -> ApiServer<T::EthSpec, impl Future<Output = ()>> {
@@ -170,7 +171,7 @@ pub async fn create_api_server_on_port<T: BeaconChainTypes>(
         local_addr: EXTERNAL_ADDR.parse().unwrap(),
         send_back_addr: EXTERNAL_ADDR.parse().unwrap(),
     };
-    let connection_id = ConnectionId::new(1);
+    let connection_id = ConnectionId::new_unchecked(1);
     pm.on_swarm_event(FromSwarm::ConnectionEstablished(ConnectionEstablished {
         peer_id,
         connection_id,
@@ -183,36 +184,60 @@ pub async fn create_api_server_on_port<T: BeaconChainTypes>(
     let eth1_service =
         eth1::Service::new(eth1::Config::default(), log.clone(), chain.spec.clone()).unwrap();
 
+    let beacon_processor_config = BeaconProcessorConfig {
+        // The number of workers must be greater than one. Tests which use the
+        // builder workflow sometimes require an internal HTTP request in order
+        // to fulfill an already in-flight HTTP request, therefore having only
+        // one worker will result in a deadlock.
+        max_workers: 2,
+        ..BeaconProcessorConfig::default()
+    };
+    let BeaconProcessorChannels {
+        beacon_processor_tx,
+        beacon_processor_rx,
+        work_reprocessing_tx,
+        work_reprocessing_rx,
+    } = BeaconProcessorChannels::new(&beacon_processor_config);
+
+    let beacon_processor_send = beacon_processor_tx;
+    BeaconProcessor {
+        network_globals: network_globals.clone(),
+        executor: test_runtime.task_executor.clone(),
+        current_workers: 0,
+        config: beacon_processor_config,
+        log: log.clone(),
+    }
+    .spawn_manager(
+        beacon_processor_rx,
+        work_reprocessing_tx,
+        work_reprocessing_rx,
+        None,
+        chain.slot_clock.clone(),
+        chain.spec.maximum_gossip_clock_disparity(),
+    )
+    .unwrap();
+
     let ctx = Arc::new(Context {
         config: Config {
             enabled: true,
-            listen_addr: IpAddr::V4(Ipv4Addr::new(127, 0, 0, 1)),
             listen_port: port,
-            allow_origin: None,
-            tls_config: None,
-            allow_sync_stalled: false,
             data_dir: std::path::PathBuf::from(DEFAULT_ROOT_DIR),
-            spec_fork_name: None,
+            ..Config::default()
         },
         chain: Some(chain),
         network_senders: Some(network_senders),
         network_globals: Some(network_globals),
+        beacon_processor_send: Some(beacon_processor_send),
         eth1_service: Some(eth1_service),
         sse_logging_components: None,
         log,
     });
 
-    let (shutdown_tx, shutdown_rx) = oneshot::channel();
-    let server_shutdown = async {
-        // It's not really interesting why this triggered, just that it happened.
-        let _ = shutdown_rx.await;
-    };
-    let (listening_socket, server) = crate::serve(ctx, server_shutdown).unwrap();
+    let (listening_socket, server) = crate::serve(ctx, test_runtime.task_executor.exit()).unwrap();
 
     ApiServer {
         server,
         listening_socket,
-        shutdown_tx,
         network_rx: network_receivers,
         local_enr: enr,
         external_peer_id: peer_id,
diff --git a/beacon_node/http_api/src/validator.rs b/beacon_node/http_api/src/validator.rs
new file mode 100644
index 0000000000..18e9dbf636
--- /dev/null
+++ b/beacon_node/http_api/src/validator.rs
@@ -0,0 +1,21 @@
+use beacon_chain::{BeaconChain, BeaconChainError, BeaconChainTypes};
+use types::*;
+
+/// Uses the `chain.validator_pubkey_cache` to resolve a pubkey to a validator
+/// index and then ensures that the validator exists in the given `state`.
+pub fn pubkey_to_validator_index<T: BeaconChainTypes>(
+    chain: &BeaconChain<T>,
+    state: &BeaconState<T::EthSpec>,
+    pubkey: &PublicKeyBytes,
+) -> Result<Option<usize>, BeaconChainError> {
+    chain
+        .validator_index(pubkey)?
+        .filter(|&index| {
+            state
+                .validators()
+                .get(index)
+                .map_or(false, |v| v.pubkey == *pubkey)
+        })
+        .map(Result::Ok)
+        .transpose()
+}
diff --git a/beacon_node/http_api/tests/broadcast_validation_tests.rs b/beacon_node/http_api/tests/broadcast_validation_tests.rs
index 4819dd99e7..96ff37d81a 100644
--- a/beacon_node/http_api/tests/broadcast_validation_tests.rs
+++ b/beacon_node/http_api/tests/broadcast_validation_tests.rs
@@ -175,6 +175,48 @@ pub async fn gossip_full_pass() {
         .block_is_known_to_fork_choice(&block.canonical_root()));
 }
 
+// This test checks that a block that is valid from both a gossip and consensus perspective is accepted when using `broadcast_validation=gossip`.
+#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
+pub async fn gossip_full_pass_ssz() {
+    /* this test targets gossip-level validation */
+    let validation_level: Option<BroadcastValidation> = Some(BroadcastValidation::Gossip);
+
+    // Validator count needs to be at least 32 or proposer boost gets set to 0 when computing
+    // `validator_count // 32`.
+    let validator_count = 64;
+    let num_initial: u64 = 31;
+    let tester = InteractiveTester::<E>::new(None, validator_count).await;
+
+    // Create some chain depth.
+    tester.harness.advance_slot();
+    tester
+        .harness
+        .extend_chain(
+            num_initial as usize,
+            BlockStrategy::OnCanonicalHead,
+            AttestationStrategy::AllValidators,
+        )
+        .await;
+    tester.harness.advance_slot();
+
+    let slot_a = Slot::new(num_initial);
+    let slot_b = slot_a + 1;
+
+    let state_a = tester.harness.get_current_state();
+    let (block, _): (SignedBeaconBlock<E>, _) = tester.harness.make_block(state_a, slot_b).await;
+
+    let response: Result<(), eth2::Error> = tester
+        .client
+        .post_beacon_blocks_v2_ssz(&block, validation_level)
+        .await;
+
+    assert!(response.is_ok());
+    assert!(tester
+        .harness
+        .chain
+        .block_is_known_to_fork_choice(&block.canonical_root()));
+}
+
 /// This test checks that a block that is **invalid** from a gossip perspective gets rejected when using `broadcast_validation=consensus`.
 #[tokio::test(flavor = "multi_thread", worker_threads = 2)]
 pub async fn consensus_invalid() {
@@ -322,13 +364,14 @@ pub async fn consensus_partial_pass_only_consensus() {
     /* submit `block_b` which should induce equivocation */
     let channel = tokio::sync::mpsc::unbounded_channel();
 
-    let publication_result: Result<(), Rejection> = publish_block(
+    let publication_result = publish_block(
         None,
         ProvenancedBlock::local(gossip_block_b.unwrap()),
         tester.harness.chain.clone(),
         &channel.0,
         test_logger,
         validation_level.unwrap(),
+        StatusCode::ACCEPTED,
     )
     .await;
 
@@ -599,13 +642,14 @@ pub async fn equivocation_consensus_late_equivocation() {
 
     let channel = tokio::sync::mpsc::unbounded_channel();
 
-    let publication_result: Result<(), Rejection> = publish_block(
+    let publication_result = publish_block(
         None,
         ProvenancedBlock::local(gossip_block_b.unwrap()),
         tester.harness.chain,
         &channel.0,
         test_logger,
         validation_level.unwrap(),
+        StatusCode::ACCEPTED,
     )
     .await;
 
@@ -809,6 +853,49 @@ pub async fn blinded_gossip_full_pass() {
         .block_is_known_to_fork_choice(&block.canonical_root()));
 }
 
+// This test checks that a block that is valid from both a gossip and consensus perspective is accepted when using `broadcast_validation=gossip`.
+#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
+pub async fn blinded_gossip_full_pass_ssz() {
+    /* this test targets gossip-level validation */
+    let validation_level: Option<BroadcastValidation> = Some(BroadcastValidation::Gossip);
+
+    // Validator count needs to be at least 32 or proposer boost gets set to 0 when computing
+    // `validator_count // 32`.
+    let validator_count = 64;
+    let num_initial: u64 = 31;
+    let tester = InteractiveTester::<E>::new(None, validator_count).await;
+
+    // Create some chain depth.
+    tester.harness.advance_slot();
+    tester
+        .harness
+        .extend_chain(
+            num_initial as usize,
+            BlockStrategy::OnCanonicalHead,
+            AttestationStrategy::AllValidators,
+        )
+        .await;
+    tester.harness.advance_slot();
+
+    let slot_a = Slot::new(num_initial);
+    let slot_b = slot_a + 1;
+
+    let state_a = tester.harness.get_current_state();
+    let (block, _): (SignedBlindedBeaconBlock<E>, _) =
+        tester.harness.make_blinded_block(state_a, slot_b).await;
+
+    let response: Result<(), eth2::Error> = tester
+        .client
+        .post_beacon_blinded_blocks_v2_ssz(&block, validation_level)
+        .await;
+
+    assert!(response.is_ok());
+    assert!(tester
+        .harness
+        .chain
+        .block_is_known_to_fork_choice(&block.canonical_root()));
+}
+
 /// This test checks that a block that is **invalid** from a gossip perspective gets rejected when using `broadcast_validation=consensus`.
 #[tokio::test(flavor = "multi_thread", worker_threads = 2)]
 pub async fn blinded_consensus_invalid() {
@@ -1209,12 +1296,13 @@ pub async fn blinded_equivocation_consensus_late_equivocation() {
 
     let channel = tokio::sync::mpsc::unbounded_channel();
 
-    let publication_result: Result<(), Rejection> = publish_blinded_block(
+    let publication_result = publish_blinded_block(
         block_b,
         tester.harness.chain,
         &channel.0,
         test_logger,
         validation_level.unwrap(),
+        StatusCode::ACCEPTED,
     )
     .await;
 
diff --git a/beacon_node/http_api/tests/fork_tests.rs b/beacon_node/http_api/tests/fork_tests.rs
index 8a3ba887b3..0ab3c706e2 100644
--- a/beacon_node/http_api/tests/fork_tests.rs
+++ b/beacon_node/http_api/tests/fork_tests.rs
@@ -326,11 +326,8 @@ async fn sync_committee_indices_across_fork() {
 
 /// Assert that an HTTP API error has the given status code and indexed errors for the given indices.
 fn assert_server_indexed_error(error: eth2::Error, status_code: u16, indices: Vec<usize>) {
-    let eth2::Error::ServerIndexedMessage(IndexedErrorMessage {
-        code,
-        failures,
-        ..
-    }) = error else {
+    let eth2::Error::ServerIndexedMessage(IndexedErrorMessage { code, failures, .. }) = error
+    else {
         panic!("wrong error, expected ServerIndexedMessage, got: {error:?}")
     };
     assert_eq!(code, status_code);
diff --git a/beacon_node/http_api/tests/interactive_tests.rs b/beacon_node/http_api/tests/interactive_tests.rs
index da92419744..d7ea7c2628 100644
--- a/beacon_node/http_api/tests/interactive_tests.rs
+++ b/beacon_node/http_api/tests/interactive_tests.rs
@@ -2,8 +2,9 @@
 use beacon_chain::{
     chain_config::{DisallowedReOrgOffsets, ReOrgThreshold},
     test_utils::{AttestationStrategy, BlockStrategy, SyncCommitteeStrategy},
+    ChainConfig,
 };
-use eth2::types::DepositContractData;
+use eth2::types::{DepositContractData, StateId};
 use execution_layer::{ForkchoiceState, PayloadAttributes};
 use http_api::test_utils::InteractiveTester;
 use parking_lot::Mutex;
@@ -17,7 +18,7 @@ use std::time::Duration;
 use tree_hash::TreeHash;
 use types::{
     Address, Epoch, EthSpec, ExecPayload, ExecutionBlockHash, ForkName, FullPayload,
-    MainnetEthSpec, ProposerPreparationData, Slot,
+    MainnetEthSpec, MinimalEthSpec, ProposerPreparationData, Slot,
 };
 
 type E = MainnetEthSpec;
@@ -48,6 +49,76 @@ async fn deposit_contract_custom_network() {
     assert_eq!(result, expected);
 }
 
+// Test that state lookups by root function correctly for states that are finalized but still
+// present in the hot database, and have had their block pruned from fork choice.
+#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
+async fn state_by_root_pruned_from_fork_choice() {
+    type E = MinimalEthSpec;
+
+    let validator_count = 24;
+    let spec = ForkName::latest().make_genesis_spec(E::default_spec());
+
+    let tester = InteractiveTester::<E>::new_with_initializer_and_mutator(
+        Some(spec.clone()),
+        validator_count,
+        Some(Box::new(move |builder| {
+            builder
+                .deterministic_keypairs(validator_count)
+                .fresh_ephemeral_store()
+                .chain_config(ChainConfig {
+                    epochs_per_migration: 1024,
+                    ..ChainConfig::default()
+                })
+        })),
+        None,
+    )
+    .await;
+
+    let client = &tester.client;
+    let harness = &tester.harness;
+
+    // Create some chain depth and finalize beyond fork choice's pruning depth.
+    let num_epochs = 8_u64;
+    let num_initial = num_epochs * E::slots_per_epoch();
+    harness.advance_slot();
+    harness
+        .extend_chain_with_sync(
+            num_initial as usize,
+            BlockStrategy::OnCanonicalHead,
+            AttestationStrategy::AllValidators,
+            SyncCommitteeStrategy::NoValidators,
+        )
+        .await;
+
+    // Should now be finalized.
+    let finalized_epoch = harness.finalized_checkpoint().epoch;
+    assert_eq!(finalized_epoch, num_epochs - 2);
+
+    // The split slot should still be at 0.
+    assert_eq!(harness.chain.store.get_split_slot(), 0);
+
+    // States that are between the split and the finalized slot should be able to be looked up by
+    // state root.
+    for slot in 0..finalized_epoch.start_slot(E::slots_per_epoch()).as_u64() {
+        let state_root = harness
+            .chain
+            .state_root_at_slot(Slot::new(slot))
+            .unwrap()
+            .unwrap();
+        let response = client
+            .get_debug_beacon_states::<E>(StateId::Root(state_root))
+            .await
+            .unwrap()
+            .unwrap();
+
+        assert!(response.finalized.unwrap());
+        assert!(!response.execution_optimistic.unwrap());
+
+        let mut state = response.data;
+        assert_eq!(state.update_tree_hash_cache().unwrap(), state_root);
+    }
+}
+
 /// Data structure for tracking fork choice updates received by the mock execution layer.
 #[derive(Debug, Default)]
 struct ForkChoiceUpdates {
diff --git a/beacon_node/http_api/tests/tests.rs b/beacon_node/http_api/tests/tests.rs
index 741ee1ffc0..adaf1a0f2d 100644
--- a/beacon_node/http_api/tests/tests.rs
+++ b/beacon_node/http_api/tests/tests.rs
@@ -1,14 +1,14 @@
 use beacon_chain::test_utils::RelativeSyncCommittee;
 use beacon_chain::{
     test_utils::{AttestationStrategy, BeaconChainHarness, BlockStrategy, EphemeralHarnessType},
-    BeaconChain, StateSkipConfig, WhenSlotSkipped, MAXIMUM_GOSSIP_CLOCK_DISPARITY,
+    BeaconChain, ChainConfig, StateSkipConfig, WhenSlotSkipped,
 };
 use environment::null_logger;
 use eth2::{
     mixin::{RequestAccept, ResponseForkName, ResponseOptional},
     reqwest::RequestBuilder,
     types::{BlockId as CoreBlockId, ForkChoiceNode, StateId as CoreStateId, *},
-    BeaconNodeHttpClient, Error, Timeouts,
+    BeaconNodeHttpClient, Error, StatusCode, Timeouts,
 };
 use execution_layer::test_utils::TestingBuilder;
 use execution_layer::test_utils::DEFAULT_BUILDER_THRESHOLD_WEI;
@@ -28,9 +28,9 @@ use sensitive_url::SensitiveUrl;
 use slot_clock::SlotClock;
 use state_processing::per_block_processing::get_expected_withdrawals;
 use state_processing::per_slot_processing;
+use state_processing::state_advance::partial_state_advance;
 use std::convert::TryInto;
 use std::sync::Arc;
-use tokio::sync::oneshot;
 use tokio::time::Duration;
 use tree_hash::TreeHash;
 use types::application_domain::ApplicationDomain;
@@ -70,7 +70,6 @@ struct ApiTester {
     attester_slashing: AttesterSlashing<E>,
     proposer_slashing: ProposerSlashing,
     voluntary_exit: SignedVoluntaryExit,
-    _server_shutdown: oneshot::Sender<()>,
     network_rx: NetworkReceivers<E>,
     local_enr: Enr,
     external_peer_id: PeerId,
@@ -79,6 +78,7 @@ struct ApiTester {
 
 struct ApiTesterConfig {
     spec: ChainSpec,
+    retain_historic_states: bool,
     builder_threshold: Option<u128>,
 }
 
@@ -88,11 +88,19 @@ impl Default for ApiTesterConfig {
         spec.shard_committee_period = 2;
         Self {
             spec,
+            retain_historic_states: false,
             builder_threshold: None,
         }
     }
 }
 
+impl ApiTesterConfig {
+    fn retain_historic_states(mut self) -> Self {
+        self.retain_historic_states = true;
+        self
+    }
+}
+
 impl ApiTester {
     pub async fn new() -> Self {
         // This allows for testing voluntary exits without building out a massive chain.
@@ -120,6 +128,10 @@ impl ApiTester {
         let harness = Arc::new(
             BeaconChainHarness::builder(MainnetEthSpec)
                 .spec(spec.clone())
+                .chain_config(ChainConfig {
+                    reconstruct_historic_states: config.retain_historic_states,
+                    ..ChainConfig::default()
+                })
                 .logger(logging::test_logger())
                 .deterministic_keypairs(VALIDATOR_COUNT)
                 .fresh_ephemeral_store()
@@ -234,11 +246,10 @@ impl ApiTester {
         let ApiServer {
             server,
             listening_socket: _,
-            shutdown_tx,
             network_rx,
             local_enr,
             external_peer_id,
-        } = create_api_server_on_port(chain.clone(), log, port).await;
+        } = create_api_server_on_port(chain.clone(), &harness.runtime, log, port).await;
 
         harness.runtime.task_executor.spawn(server, "api_server");
 
@@ -266,7 +277,6 @@ impl ApiTester {
             attester_slashing,
             proposer_slashing,
             voluntary_exit,
-            _server_shutdown: shutdown_tx,
             network_rx,
             local_enr,
             external_peer_id,
@@ -320,11 +330,10 @@ impl ApiTester {
         let ApiServer {
             server,
             listening_socket,
-            shutdown_tx,
             network_rx,
             local_enr,
             external_peer_id,
-        } = create_api_server(chain.clone(), log).await;
+        } = create_api_server(chain.clone(), &harness.runtime, log).await;
 
         harness.runtime.task_executor.spawn(server, "api_server");
 
@@ -349,7 +358,6 @@ impl ApiTester {
             attester_slashing,
             proposer_slashing,
             voluntary_exit,
-            _server_shutdown: shutdown_tx,
             network_rx,
             local_enr,
             external_peer_id,
@@ -381,6 +389,7 @@ impl ApiTester {
     pub async fn new_mev_tester_no_builder_threshold() -> Self {
         let mut config = ApiTesterConfig {
             builder_threshold: Some(0),
+            retain_historic_states: false,
             spec: E::default_spec(),
         };
         config.spec.altair_fork_epoch = Some(Epoch::new(0));
@@ -1247,6 +1256,22 @@ impl ApiTester {
         self
     }
 
+    pub async fn test_post_beacon_blocks_ssz_valid(mut self) -> Self {
+        let next_block = &self.next_block;
+
+        self.client
+            .post_beacon_blocks_ssz(next_block)
+            .await
+            .unwrap();
+
+        assert!(
+            self.network_rx.network_recv.recv().await.is_some(),
+            "valid blocks should be sent to network"
+        );
+
+        self
+    }
+
     pub async fn test_post_beacon_blocks_invalid(mut self) -> Self {
         let block = self
             .harness
@@ -1270,6 +1295,86 @@ impl ApiTester {
         self
     }
 
+    pub async fn test_post_beacon_blocks_ssz_invalid(mut self) -> Self {
+        let block = self
+            .harness
+            .make_block_with_modifier(
+                self.harness.get_current_state(),
+                self.harness.get_current_slot(),
+                |b| {
+                    *b.state_root_mut() = Hash256::zero();
+                },
+            )
+            .await
+            .0;
+
+        assert!(self.client.post_beacon_blocks_ssz(&block).await.is_err());
+
+        assert!(
+            self.network_rx.network_recv.recv().await.is_some(),
+            "gossip valid blocks should be sent to network"
+        );
+
+        self
+    }
+
+    pub async fn test_post_beacon_blocks_duplicate(self) -> Self {
+        let block = self
+            .harness
+            .make_block(
+                self.harness.get_current_state(),
+                self.harness.get_current_slot(),
+            )
+            .await
+            .0;
+
+        assert!(self.client.post_beacon_blocks(&block).await.is_ok());
+
+        let blinded_block = block.clone_as_blinded();
+
+        // Test all the POST methods in sequence, they should all behave the same.
+        let responses = vec![
+            self.client.post_beacon_blocks(&block).await.unwrap_err(),
+            self.client
+                .post_beacon_blocks_v2(&block, None)
+                .await
+                .unwrap_err(),
+            self.client
+                .post_beacon_blocks_ssz(&block)
+                .await
+                .unwrap_err(),
+            self.client
+                .post_beacon_blocks_v2_ssz(&block, None)
+                .await
+                .unwrap_err(),
+            self.client
+                .post_beacon_blinded_blocks(&blinded_block)
+                .await
+                .unwrap_err(),
+            self.client
+                .post_beacon_blinded_blocks_v2(&blinded_block, None)
+                .await
+                .unwrap_err(),
+            self.client
+                .post_beacon_blinded_blocks_ssz(&blinded_block)
+                .await
+                .unwrap_err(),
+            self.client
+                .post_beacon_blinded_blocks_v2_ssz(&blinded_block, None)
+                .await
+                .unwrap_err(),
+        ];
+        for (i, response) in responses.into_iter().enumerate() {
+            assert_eq!(
+                response.status().unwrap(),
+                StatusCode::ACCEPTED,
+                "response {i}"
+            );
+        }
+
+        self
+    }
+
     pub async fn test_beacon_blocks(self) -> Self {
         for block_id in self.interesting_block_ids() {
             let expected = block_id
@@ -2274,7 +2379,9 @@ impl ApiTester {
             .unwrap();
 
         self.chain.slot_clock.set_current_time(
-            current_epoch_start - MAXIMUM_GOSSIP_CLOCK_DISPARITY - Duration::from_millis(1),
+            current_epoch_start
+                - self.chain.spec.maximum_gossip_clock_disparity()
+                - Duration::from_millis(1),
         );
 
         let dependent_root = self
@@ -2311,9 +2418,9 @@ impl ApiTester {
             "should not get attester duties outside of tolerance"
         );
 
-        self.chain
-            .slot_clock
-            .set_current_time(current_epoch_start - MAXIMUM_GOSSIP_CLOCK_DISPARITY);
+        self.chain.slot_clock.set_current_time(
+            current_epoch_start - self.chain.spec.maximum_gossip_clock_disparity(),
+        );
 
         self.client
             .get_validator_duties_proposer(current_epoch)
@@ -2537,6 +2644,66 @@ impl ApiTester {
         }
     }
 
+    pub async fn test_blinded_block_production_ssz<Payload: AbstractExecPayload<E>>(&self) {
+        let fork = self.chain.canonical_head.cached_head().head_fork();
+        let genesis_validators_root = self.chain.genesis_validators_root;
+
+        for _ in 0..E::slots_per_epoch() * 3 {
+            let slot = self.chain.slot().unwrap();
+            let epoch = self.chain.epoch().unwrap();
+
+            let proposer_pubkey_bytes = self
+                .client
+                .get_validator_duties_proposer(epoch)
+                .await
+                .unwrap()
+                .data
+                .into_iter()
+                .find(|duty| duty.slot == slot)
+                .map(|duty| duty.pubkey)
+                .unwrap();
+            let proposer_pubkey = (&proposer_pubkey_bytes).try_into().unwrap();
+
+            let sk = self
+                .validator_keypairs()
+                .iter()
+                .find(|kp| kp.pk == proposer_pubkey)
+                .map(|kp| kp.sk.clone())
+                .unwrap();
+
+            let randao_reveal = {
+                let domain = self.chain.spec.get_domain(
+                    epoch,
+                    Domain::Randao,
+                    &fork,
+                    genesis_validators_root,
+                );
+                let message = epoch.signing_root(domain);
+                sk.sign(message).into()
+            };
+
+            let block = self
+                .client
+                .get_validator_blinded_blocks::<E, Payload>(slot, &randao_reveal, None)
+                .await
+                .unwrap()
+                .data;
+
+            let signed_block = block.sign(&sk, &fork, genesis_validators_root, &self.chain.spec);
+
+            self.client
+                .post_beacon_blinded_blocks_ssz(&signed_block)
+                .await
+                .unwrap();
+
+            // This converts the generic `Payload` to a concrete type for comparison.
+            let head_block = SignedBeaconBlock::from(signed_block.clone());
+            assert_eq!(head_block, signed_block);
+
+            self.chain.slot_clock.set_slot(slot.as_u64() + 1);
+        }
+    }
+
     pub async fn test_blinded_block_production_no_verify_randao<Payload: AbstractExecPayload<E>>(
         self,
     ) -> Self {
@@ -2980,6 +3147,69 @@ impl ApiTester {
         self
     }
 
+    pub async fn test_post_validator_liveness_epoch(self) -> Self {
+        let epoch = self.chain.epoch().unwrap();
+        let head_state = self.chain.head_beacon_state_cloned();
+        let indices = (0..head_state.validators().len())
+            .map(|i| i as u64)
+            .collect::<Vec<_>>();
+
+        // Construct the expected response
+        let expected: Vec<StandardLivenessResponseData> = head_state
+            .validators()
+            .iter()
+            .enumerate()
+            .map(|(index, _)| StandardLivenessResponseData {
+                index: index as u64,
+                is_live: false,
+            })
+            .collect();
+
+        let result = self
+            .client
+            .post_validator_liveness_epoch(epoch, indices.clone())
+            .await
+            .unwrap()
+            .data;
+
+        assert_eq!(result, expected);
+
+        // Attest to the current slot
+        self.client
+            .post_beacon_pool_attestations(self.attestations.as_slice())
+            .await
+            .unwrap();
+
+        let result = self
+            .client
+            .post_validator_liveness_epoch(epoch, indices.clone())
+            .await
+            .unwrap()
+            .data;
+
+        let committees = head_state
+            .get_beacon_committees_at_slot(self.chain.slot().unwrap())
+            .unwrap();
+        let attesting_validators: Vec<usize> = committees
+            .into_iter()
+            .flat_map(|committee| committee.committee.iter().cloned())
+            .collect();
+        // All attesters should now be considered live
+        let expected = expected
+            .into_iter()
+            .map(|mut a| {
+                if attesting_validators.contains(&(a.index as usize)) {
+                    a.is_live = true;
+                }
+                a
+            })
+            .collect::<Vec<_>>();
+
+        assert_eq!(result, expected);
+
+        self
+    }
+
     // Helper function for tests that require a valid RANDAO signature.
     async fn get_test_randao(&self, slot: Slot, epoch: Epoch) -> (u64, SignatureBytes) {
         let fork = self.chain.canonical_head.cached_head().head_fork();
@@ -4169,6 +4399,72 @@ impl ApiTester {
         self
     }
 
+    pub async fn test_get_expected_withdrawals_invalid_state(self) -> Self {
+        let state_id = CoreStateId::Root(Hash256::zero());
+
+        let result = self.client.get_expected_withdrawals(&state_id).await;
+
+        match result {
+            Err(e) => {
+                assert_eq!(e.status().unwrap(), 404);
+            }
+            _ => panic!("query did not fail correctly"),
+        }
+
+        self
+    }
+
+    pub async fn test_get_expected_withdrawals_capella(self) -> Self {
+        let slot = self.chain.slot().unwrap();
+        let state_id = CoreStateId::Slot(slot);
+
+        // calculate the expected withdrawals
+        let (mut state, _, _) = StateId(state_id).state(&self.chain).unwrap();
+        let proposal_slot = state.slot() + 1;
+        let proposal_epoch = proposal_slot.epoch(E::slots_per_epoch());
+        let (state_root, _, _) = StateId(state_id).root(&self.chain).unwrap();
+        if proposal_epoch != state.current_epoch() {
+            let _ = partial_state_advance(
+                &mut state,
+                Some(state_root),
+                proposal_slot,
+                &self.chain.spec,
+            );
+        }
+        let expected_withdrawals = get_expected_withdrawals(&state, &self.chain.spec).unwrap();
+
+        // fetch expected withdrawals from the client
+        let result = self.client.get_expected_withdrawals(&state_id).await;
+        match result {
+            Ok(withdrawal_response) => {
+                assert_eq!(withdrawal_response.execution_optimistic, Some(false));
+                assert_eq!(withdrawal_response.finalized, Some(false));
+                assert_eq!(withdrawal_response.data, expected_withdrawals.to_vec());
+            }
+            Err(e) => {
+                println!("{:?}", e);
+                panic!("query failed incorrectly");
+            }
+        }
+
+        self
+    }
+
+    pub async fn test_get_expected_withdrawals_pre_capella(self) -> Self {
+        let state_id = CoreStateId::Head;
+
+        let result = self.client.get_expected_withdrawals(&state_id).await;
+
+        match result {
+            Err(e) => {
+                assert_eq!(e.status().unwrap(), 400);
+            }
+            _ => panic!("query did not fail correctly"),
+        }
+
+        self
+    }
+
     pub async fn test_get_events_altair(self) -> Self {
         let topics = vec![EventTopic::ContributionAndProof];
         let mut events_future = self
@@ -4388,6 +4684,22 @@ async fn post_beacon_blocks_valid() {
     ApiTester::new().await.test_post_beacon_blocks_valid().await;
 }
 
+#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
+async fn post_beacon_blocks_ssz_valid() {
+    ApiTester::new()
+        .await
+        .test_post_beacon_blocks_ssz_valid()
+        .await;
+}
+
+#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
+async fn test_post_beacon_blocks_ssz_invalid() {
+    ApiTester::new()
+        .await
+        .test_post_beacon_blocks_ssz_invalid()
+        .await;
+}
+
 #[tokio::test(flavor = "multi_thread", worker_threads = 2)]
 async fn post_beacon_blocks_invalid() {
     ApiTester::new()
@@ -4396,6 +4708,14 @@ async fn post_beacon_blocks_invalid() {
         .await;
 }
 
+#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
+async fn post_beacon_blocks_duplicate() {
+    ApiTester::new()
+        .await
+        .test_post_beacon_blocks_duplicate()
+        .await;
+}
+
 #[tokio::test(flavor = "multi_thread", worker_threads = 2)]
 async fn beacon_pools_post_attestations_valid() {
     ApiTester::new()
@@ -4531,7 +4851,7 @@ async fn get_validator_duties_attester_with_skip_slots() {
 
 #[tokio::test(flavor = "multi_thread", worker_threads = 2)]
 async fn get_validator_duties_proposer() {
-    ApiTester::new()
+    ApiTester::new_from_config(ApiTesterConfig::default().retain_historic_states())
         .await
         .test_get_validator_duties_proposer()
         .await;
@@ -4539,7 +4859,7 @@ async fn get_validator_duties_proposer() {
 
 #[tokio::test(flavor = "multi_thread", worker_threads = 2)]
 async fn get_validator_duties_proposer_with_skip_slots() {
-    ApiTester::new()
+    ApiTester::new_from_config(ApiTesterConfig::default().retain_historic_states())
         .await
         .skip_slots(E::slots_per_epoch() * 2)
         .test_get_validator_duties_proposer()
@@ -4584,6 +4904,14 @@ async fn blinded_block_production_full_payload_premerge() {
         .await;
 }
 
+#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
+async fn blinded_block_production_ssz_full_payload_premerge() {
+    ApiTester::new()
+        .await
+        .test_blinded_block_production_ssz::<FullPayload<_>>()
+        .await;
+}
+
 #[tokio::test(flavor = "multi_thread", worker_threads = 2)]
 async fn blinded_block_production_with_skip_slots_full_payload_premerge() {
     ApiTester::new()
@@ -4593,6 +4921,15 @@ async fn blinded_block_production_with_skip_slots_full_payload_premerge() {
         .await;
 }
 
+#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
+async fn blinded_block_production_ssz_with_skip_slots_full_payload_premerge() {
+    ApiTester::new()
+        .await
+        .skip_slots(E::slots_per_epoch() * 2)
+        .test_blinded_block_production_ssz::<FullPayload<_>>()
+        .await;
+}
+
 #[tokio::test(flavor = "multi_thread", worker_threads = 2)]
 async fn blinded_block_production_no_verify_randao_full_payload_premerge() {
     ApiTester::new()
@@ -4854,6 +5191,7 @@ async fn builder_payload_chosen_by_profit() {
 async fn builder_works_post_capella() {
     let mut config = ApiTesterConfig {
         builder_threshold: Some(0),
+        retain_historic_states: false,
         spec: E::default_spec(),
     };
     config.spec.altair_fork_epoch = Some(Epoch::new(0));
@@ -4870,6 +5208,14 @@ async fn builder_works_post_capella() {
         .await;
 }
 
+#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
+async fn post_validator_liveness_epoch() {
+    ApiTester::new()
+        .await
+        .test_post_validator_liveness_epoch()
+        .await;
+}
+
 #[tokio::test(flavor = "multi_thread", worker_threads = 2)]
 async fn lighthouse_endpoints() {
     ApiTester::new()
@@ -4909,3 +5255,37 @@ async fn optimistic_responses() {
         .test_check_optimistic_responses()
         .await;
 }
+
+#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
+async fn expected_withdrawals_invalid_pre_capella() {
+    let mut config = ApiTesterConfig::default();
+    config.spec.altair_fork_epoch = Some(Epoch::new(0));
+    ApiTester::new_from_config(config)
+        .await
+        .test_get_expected_withdrawals_pre_capella()
+        .await;
+}
+
+#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
+async fn expected_withdrawals_invalid_state() {
+    let mut config = ApiTesterConfig::default();
+    config.spec.altair_fork_epoch = Some(Epoch::new(0));
+    config.spec.bellatrix_fork_epoch = Some(Epoch::new(0));
+    config.spec.capella_fork_epoch = Some(Epoch::new(0));
+    ApiTester::new_from_config(config)
+        .await
+        .test_get_expected_withdrawals_invalid_state()
+        .await;
+}
+
+#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
+async fn expected_withdrawals_valid_capella() {
+    let mut config = ApiTesterConfig::default();
+    config.spec.altair_fork_epoch = Some(Epoch::new(0));
+    config.spec.bellatrix_fork_epoch = Some(Epoch::new(0));
+    config.spec.capella_fork_epoch = Some(Epoch::new(0));
+    ApiTester::new_from_config(config)
+        .await
+        .test_get_expected_withdrawals_capella()
+        .await;
+}
diff --git a/beacon_node/http_metrics/src/metrics.rs b/beacon_node/http_metrics/src/metrics.rs
index 9b15694211..785206b757 100644
--- a/beacon_node/http_metrics/src/metrics.rs
+++ b/beacon_node/http_metrics/src/metrics.rs
@@ -1,6 +1,6 @@
 use crate::Context;
 use beacon_chain::BeaconChainTypes;
-use lighthouse_metrics::{Encoder, TextEncoder};
+use lighthouse_metrics::TextEncoder;
 use lighthouse_network::prometheus_client::encoding::text::encode;
 use malloc_utils::scrape_allocator_metrics;
 
@@ -9,7 +9,7 @@ pub use lighthouse_metrics::*;
 pub fn gather_prometheus_metrics<T: BeaconChainTypes>(
     ctx: &Context<T>,
 ) -> std::result::Result<String, String> {
-    let mut buffer = vec![];
+    let mut buffer = String::new();
     let encoder = TextEncoder::new();
 
     // There are two categories of metrics:
@@ -50,7 +50,7 @@ pub fn gather_prometheus_metrics<T: BeaconChainTypes>(
     }
 
     encoder
-        .encode(&lighthouse_metrics::gather(), &mut buffer)
+        .encode_utf8(&lighthouse_metrics::gather(), &mut buffer)
         .unwrap();
     // encode gossipsub metrics also if they exist
     if let Some(registry) = ctx.gossipsub_registry.as_ref() {
@@ -59,5 +59,5 @@ pub fn gather_prometheus_metrics<T: BeaconChainTypes>(
         }
     }
 
-    String::from_utf8(buffer).map_err(|e| format!("Failed to encode prometheus info: {:?}", e))
+    Ok(buffer)
 }
diff --git a/beacon_node/lighthouse_network/Cargo.toml b/beacon_node/lighthouse_network/Cargo.toml
index 6d056d8350..925d278ad6 100644
--- a/beacon_node/lighthouse_network/Cargo.toml
+++ b/beacon_node/lighthouse_network/Cargo.toml
@@ -5,7 +5,7 @@ authors = ["Sigma Prime <contact@sigmaprime.io>"]
 edition = "2021"
 
 [dependencies]
-discv5 = { version = "0.3.0", features = ["libp2p"]}
+discv5 = { version = "0.3.1", features = ["libp2p"] }
 unsigned-varint = { version = "0.6.0", features = ["codec"] }
 types = { path =  "../../consensus/types" }
 ssz_types = "0.5.3"
@@ -40,15 +40,16 @@ directory = { path = "../../common/directory" }
 regex = "1.5.5"
 strum = { version = "0.24.0", features = ["derive"] }
 superstruct = "0.5.0"
-prometheus-client = "0.18.0"
+prometheus-client = "0.21.0"
 unused_port = { path = "../../common/unused_port" }
 delay_map = "0.3.0"
 void = "1"
+libp2p-mplex = "0.40.0"
 
 [dependencies.libp2p]
-version = "0.50.0"
+version = "0.52"
 default-features = false
-features = ["websocket", "identify", "mplex", "yamux", "noise", "gossipsub", "dns", "tcp", "tokio", "plaintext", "secp256k1", "macros", "ecdsa"]
+features = ["websocket", "identify", "yamux", "noise", "gossipsub", "dns", "tcp", "tokio", "plaintext", "secp256k1", "macros", "ecdsa"]
 
 [dev-dependencies]
 slog-term = "2.6.0"
diff --git a/beacon_node/lighthouse_network/src/config.rs b/beacon_node/lighthouse_network/src/config.rs
index 9467526458..0ab7c03e7f 100644
--- a/beacon_node/lighthouse_network/src/config.rs
+++ b/beacon_node/lighthouse_network/src/config.rs
@@ -6,10 +6,7 @@ use directory::{
     DEFAULT_BEACON_NODE_DIR, DEFAULT_HARDCODED_NETWORK, DEFAULT_NETWORK_DIR, DEFAULT_ROOT_DIR,
 };
 use discv5::{Discv5Config, Discv5ConfigBuilder};
-use libp2p::gossipsub::{
-    FastMessageId, GossipsubConfig, GossipsubConfigBuilder, GossipsubMessage, MessageId,
-    RawGossipsubMessage, ValidationMode,
-};
+use libp2p::gossipsub;
 use libp2p::Multiaddr;
 use serde_derive::{Deserialize, Serialize};
 use sha2::{Digest, Sha256};
@@ -19,11 +16,6 @@ use std::sync::Arc;
 use std::time::Duration;
 use types::{ForkContext, ForkName};
 
-/// The maximum transmit size of gossip messages in bytes pre-merge.
-const GOSSIP_MAX_SIZE: usize = 1_048_576; // 1M
-/// The maximum transmit size of gossip messages in bytes post-merge.
-const GOSSIP_MAX_SIZE_POST_MERGE: usize = 10 * 1_048_576; // 10M
-
 /// The cache time is set to accommodate the circulation time of an attestation.
 ///
 /// The p2p spec declares that we accept attestations within the following range:
@@ -38,20 +30,20 @@ const GOSSIP_MAX_SIZE_POST_MERGE: usize = 10 * 1_048_576; // 10M
 /// another 500ms for "fudge factor".
 pub const DUPLICATE_CACHE_TIME: Duration = Duration::from_secs(33 * 12 + 1);
 
-// We treat uncompressed messages as invalid and never use the INVALID_SNAPPY_DOMAIN as in the
-// specification. We leave it here for posterity.
-// const MESSAGE_DOMAIN_INVALID_SNAPPY: [u8; 4] = [0, 0, 0, 0];
-const MESSAGE_DOMAIN_VALID_SNAPPY: [u8; 4] = [1, 0, 0, 0];
-
 /// The maximum size of gossip messages.
-pub fn gossip_max_size(is_merge_enabled: bool) -> usize {
+pub fn gossip_max_size(is_merge_enabled: bool, gossip_max_size: usize) -> usize {
     if is_merge_enabled {
-        GOSSIP_MAX_SIZE_POST_MERGE
+        gossip_max_size
     } else {
-        GOSSIP_MAX_SIZE
+        gossip_max_size / 10
     }
 }
 
+pub struct GossipsubConfigParams {
+    pub message_domain_valid_snappy: [u8; 4],
+    pub gossip_max_size: usize,
+}
+
 #[derive(Clone, Debug, Serialize, Deserialize)]
 #[serde(default)]
 /// Network configuration for lighthouse.
@@ -83,7 +75,7 @@ pub struct Config {
 
     /// Gossipsub configuration parameters.
     #[serde(skip)]
-    pub gs_config: GossipsubConfig,
+    pub gs_config: gossipsub::Config,
 
     /// Discv5 configuration parameters.
     #[serde(skip)]
@@ -265,7 +257,7 @@ impl Default for Config {
 
         // Note: Using the default config here. Use `gossipsub_config` function for getting
         // Lighthouse specific configuration for gossipsub.
-        let gs_config = GossipsubConfigBuilder::default()
+        let gs_config = gossipsub::ConfigBuilder::default()
             .build()
             .expect("valid gossipsub configuration");
 
@@ -416,16 +408,20 @@ impl From<u8> for NetworkLoad {
 }
 
 /// Return a Lighthouse specific `GossipsubConfig` where the `message_id_fn` depends on the current fork.
-pub fn gossipsub_config(network_load: u8, fork_context: Arc<ForkContext>) -> GossipsubConfig {
+pub fn gossipsub_config(
+    network_load: u8,
+    fork_context: Arc<ForkContext>,
+    gossipsub_config_params: GossipsubConfigParams,
+) -> gossipsub::Config {
     // The function used to generate a gossipsub message id
     // We use the first 8 bytes of SHA256(topic, data) for content addressing
-    let fast_gossip_message_id = |message: &RawGossipsubMessage| {
+    let fast_gossip_message_id = |message: &gossipsub::RawMessage| {
         let data = [message.topic.as_str().as_bytes(), &message.data].concat();
-        FastMessageId::from(&Sha256::digest(data)[..8])
+        gossipsub::FastMessageId::from(&Sha256::digest(data)[..8])
     };
     fn prefix(
         prefix: [u8; 4],
-        message: &GossipsubMessage,
+        message: &gossipsub::Message,
         fork_context: Arc<ForkContext>,
     ) -> Vec<u8> {
         let topic_bytes = message.topic.as_str().as_bytes();
@@ -449,20 +445,23 @@ pub fn gossipsub_config(network_load: u8, fork_context: Arc<ForkContext>) -> Gos
             }
         }
     }
-
+    let message_domain_valid_snappy = gossipsub_config_params.message_domain_valid_snappy;
     let is_merge_enabled = fork_context.fork_exists(ForkName::Merge);
-    let gossip_message_id = move |message: &GossipsubMessage| {
-        MessageId::from(
+    let gossip_message_id = move |message: &gossipsub::Message| {
+        gossipsub::MessageId::from(
             &Sha256::digest(
-                prefix(MESSAGE_DOMAIN_VALID_SNAPPY, message, fork_context.clone()).as_slice(),
+                prefix(message_domain_valid_snappy, message, fork_context.clone()).as_slice(),
             )[..20],
         )
     };
 
     let load = NetworkLoad::from(network_load);
 
-    GossipsubConfigBuilder::default()
-        .max_transmit_size(gossip_max_size(is_merge_enabled))
+    gossipsub::ConfigBuilder::default()
+        .max_transmit_size(gossip_max_size(
+            is_merge_enabled,
+            gossipsub_config_params.gossip_max_size,
+        ))
         .heartbeat_interval(load.heartbeat_interval)
         .mesh_n(load.mesh_n)
         .mesh_n_low(load.mesh_n_low)
@@ -474,7 +473,7 @@ pub fn gossipsub_config(network_load: u8, fork_context: Arc<ForkContext>) -> Gos
         .max_messages_per_rpc(Some(500)) // Responses to IWANT can be quite large
         .history_gossip(load.history_gossip)
         .validate_messages() // require validation before propagation
-        .validation_mode(ValidationMode::Anonymous)
+        .validation_mode(gossipsub::ValidationMode::Anonymous)
         .duplicate_cache_time(DUPLICATE_CACHE_TIME)
         .message_id_fn(gossip_message_id)
         .fast_message_id_fn(fast_gossip_message_id)
diff --git a/beacon_node/lighthouse_network/src/discovery/enr.rs b/beacon_node/lighthouse_network/src/discovery/enr.rs
index f85c4b3e5c..ef22f816a7 100644
--- a/beacon_node/lighthouse_network/src/discovery/enr.rs
+++ b/beacon_node/lighthouse_network/src/discovery/enr.rs
@@ -7,7 +7,7 @@ use super::ENR_FILENAME;
 use crate::types::{Enr, EnrAttestationBitfield, EnrSyncCommitteeBitfield};
 use crate::NetworkConfig;
 use discv5::enr::EnrKey;
-use libp2p::core::identity::Keypair;
+use libp2p::identity::Keypair;
 use slog::{debug, warn};
 use ssz::{Decode, Encode};
 use ssz_types::BitVector;
@@ -133,7 +133,7 @@ pub fn build_or_load_enr<T: EthSpec>(
     // Build the local ENR.
     // Note: Discovery should update the ENR record's IP to the external IP as seen by the
     // majority of our peers, if the CLI doesn't expressly forbid it.
-    let enr_key = CombinedKey::from_libp2p(&local_key)?;
+    let enr_key = CombinedKey::from_libp2p(local_key)?;
     let mut local_enr = build_enr::<T>(&enr_key, config, enr_fork_id)?;
 
     use_or_load_enr(&enr_key, &mut local_enr, config, log)?;
diff --git a/beacon_node/lighthouse_network/src/discovery/enr_ext.rs b/beacon_node/lighthouse_network/src/discovery/enr_ext.rs
index 3df7f7c16f..753da6292c 100644
--- a/beacon_node/lighthouse_network/src/discovery/enr_ext.rs
+++ b/beacon_node/lighthouse_network/src/discovery/enr_ext.rs
@@ -1,7 +1,9 @@
 //! ENR extension trait to support libp2p integration.
+
 use crate::{Enr, Multiaddr, PeerId};
 use discv5::enr::{CombinedKey, CombinedPublicKey};
-use libp2p::core::{identity::Keypair, identity::PublicKey, multiaddr::Protocol};
+use libp2p::core::multiaddr::Protocol;
+use libp2p::identity::{ed25519, secp256k1, KeyType, Keypair, PublicKey};
 use tiny_keccak::{Hasher, Keccak};
 
 /// Extend ENR for libp2p types.
@@ -35,7 +37,10 @@ pub trait CombinedKeyPublicExt {
 /// Extend ENR CombinedKey for conversion to libp2p keys.
 pub trait CombinedKeyExt {
     /// Converts a libp2p key into an ENR combined key.
-    fn from_libp2p(key: &libp2p::core::identity::Keypair) -> Result<CombinedKey, &'static str>;
+    fn from_libp2p(key: Keypair) -> Result<CombinedKey, &'static str>;
+
+    /// Converts a [`secp256k1::Keypair`] into and Enr [`CombinedKey`].
+    fn from_secp256k1(key: &secp256k1::Keypair) -> CombinedKey;
 }
 
 impl EnrExt for Enr {
@@ -88,14 +93,14 @@ impl EnrExt for Enr {
             if let Some(udp) = self.udp4() {
                 let mut multiaddr: Multiaddr = ip.into();
                 multiaddr.push(Protocol::Udp(udp));
-                multiaddr.push(Protocol::P2p(peer_id.into()));
+                multiaddr.push(Protocol::P2p(peer_id));
                 multiaddrs.push(multiaddr);
             }
 
             if let Some(tcp) = self.tcp4() {
                 let mut multiaddr: Multiaddr = ip.into();
                 multiaddr.push(Protocol::Tcp(tcp));
-                multiaddr.push(Protocol::P2p(peer_id.into()));
+                multiaddr.push(Protocol::P2p(peer_id));
                 multiaddrs.push(multiaddr);
             }
         }
@@ -103,14 +108,14 @@ impl EnrExt for Enr {
             if let Some(udp6) = self.udp6() {
                 let mut multiaddr: Multiaddr = ip6.into();
                 multiaddr.push(Protocol::Udp(udp6));
-                multiaddr.push(Protocol::P2p(peer_id.into()));
+                multiaddr.push(Protocol::P2p(peer_id));
                 multiaddrs.push(multiaddr);
             }
 
             if let Some(tcp6) = self.tcp6() {
                 let mut multiaddr: Multiaddr = ip6.into();
                 multiaddr.push(Protocol::Tcp(tcp6));
-                multiaddr.push(Protocol::P2p(peer_id.into()));
+                multiaddr.push(Protocol::P2p(peer_id));
                 multiaddrs.push(multiaddr);
             }
         }
@@ -128,7 +133,7 @@ impl EnrExt for Enr {
             if let Some(tcp) = self.tcp4() {
                 let mut multiaddr: Multiaddr = ip.into();
                 multiaddr.push(Protocol::Tcp(tcp));
-                multiaddr.push(Protocol::P2p(peer_id.into()));
+                multiaddr.push(Protocol::P2p(peer_id));
                 multiaddrs.push(multiaddr);
             }
         }
@@ -136,7 +141,7 @@ impl EnrExt for Enr {
             if let Some(tcp6) = self.tcp6() {
                 let mut multiaddr: Multiaddr = ip6.into();
                 multiaddr.push(Protocol::Tcp(tcp6));
-                multiaddr.push(Protocol::P2p(peer_id.into()));
+                multiaddr.push(Protocol::P2p(peer_id));
                 multiaddrs.push(multiaddr);
             }
         }
@@ -154,7 +159,7 @@ impl EnrExt for Enr {
             if let Some(udp) = self.udp4() {
                 let mut multiaddr: Multiaddr = ip.into();
                 multiaddr.push(Protocol::Udp(udp));
-                multiaddr.push(Protocol::P2p(peer_id.into()));
+                multiaddr.push(Protocol::P2p(peer_id));
                 multiaddrs.push(multiaddr);
             }
         }
@@ -162,7 +167,7 @@ impl EnrExt for Enr {
             if let Some(udp6) = self.udp6() {
                 let mut multiaddr: Multiaddr = ip6.into();
                 multiaddr.push(Protocol::Udp(udp6));
-                multiaddr.push(Protocol::P2p(peer_id.into()));
+                multiaddr.push(Protocol::P2p(peer_id));
                 multiaddrs.push(multiaddr);
             }
         }
@@ -199,18 +204,16 @@ impl CombinedKeyPublicExt for CombinedPublicKey {
         match self {
             Self::Secp256k1(pk) => {
                 let pk_bytes = pk.to_sec1_bytes();
-                let libp2p_pk = libp2p::core::PublicKey::Secp256k1(
-                    libp2p::core::identity::secp256k1::PublicKey::decode(&pk_bytes)
-                        .expect("valid public key"),
-                );
+                let libp2p_pk: PublicKey = secp256k1::PublicKey::try_from_bytes(&pk_bytes)
+                    .expect("valid public key")
+                    .into();
                 PeerId::from_public_key(&libp2p_pk)
             }
             Self::Ed25519(pk) => {
                 let pk_bytes = pk.to_bytes();
-                let libp2p_pk = libp2p::core::PublicKey::Ed25519(
-                    libp2p::core::identity::ed25519::PublicKey::decode(&pk_bytes)
-                        .expect("valid public key"),
-                );
+                let libp2p_pk: PublicKey = ed25519::PublicKey::try_from_bytes(&pk_bytes)
+                    .expect("valid public key")
+                    .into();
                 PeerId::from_public_key(&libp2p_pk)
             }
         }
@@ -218,25 +221,32 @@ impl CombinedKeyPublicExt for CombinedPublicKey {
 }
 
 impl CombinedKeyExt for CombinedKey {
-    fn from_libp2p(key: &libp2p::core::identity::Keypair) -> Result<CombinedKey, &'static str> {
-        match key {
-            Keypair::Secp256k1(key) => {
+    fn from_libp2p(key: Keypair) -> Result<CombinedKey, &'static str> {
+        match key.key_type() {
+            KeyType::Secp256k1 => {
+                let key = key.try_into_secp256k1().expect("right key type");
                 let secret =
                     discv5::enr::k256::ecdsa::SigningKey::from_slice(&key.secret().to_bytes())
                         .expect("libp2p key must be valid");
                 Ok(CombinedKey::Secp256k1(secret))
             }
-            Keypair::Ed25519(key) => {
+            KeyType::Ed25519 => {
+                let key = key.try_into_ed25519().expect("right key type");
                 let ed_keypair = discv5::enr::ed25519_dalek::SigningKey::from_bytes(
-                    &(key.encode()[..32])
+                    &(key.to_bytes()[..32])
                         .try_into()
                         .expect("libp2p key must be valid"),
                 );
                 Ok(CombinedKey::from(ed_keypair))
             }
-            Keypair::Ecdsa(_) => Err("Ecdsa keypairs not supported"),
+            _ => Err("Unsupported keypair kind"),
         }
     }
+    fn from_secp256k1(key: &secp256k1::Keypair) -> Self {
+        let secret = discv5::enr::k256::ecdsa::SigningKey::from_slice(&key.secret().to_bytes())
+            .expect("libp2p key must be valid");
+        CombinedKey::Secp256k1(secret)
+    }
 }
 
 // helper function to convert a peer_id to a node_id. This is only possible for secp256k1/ed25519 libp2p
@@ -246,37 +256,46 @@ pub fn peer_id_to_node_id(peer_id: &PeerId) -> Result<discv5::enr::NodeId, Strin
     // if generated from a PublicKey with Identity multihash.
     let pk_bytes = &peer_id.to_bytes()[2..];
 
-    match PublicKey::from_protobuf_encoding(pk_bytes).map_err(|e| {
+    let public_key = PublicKey::try_decode_protobuf(pk_bytes).map_err(|e| {
         format!(
             " Cannot parse libp2p public key public key from peer id: {}",
             e
         )
-    })? {
-        PublicKey::Secp256k1(pk) => {
-            let uncompressed_key_bytes = &pk.encode_uncompressed()[1..];
+    })?;
+
+    match public_key.key_type() {
+        KeyType::Secp256k1 => {
+            let pk = public_key
+                .clone()
+                .try_into_secp256k1()
+                .expect("right key type");
+            let uncompressed_key_bytes = &pk.to_bytes_uncompressed()[1..];
             let mut output = [0_u8; 32];
             let mut hasher = Keccak::v256();
             hasher.update(uncompressed_key_bytes);
             hasher.finalize(&mut output);
             Ok(discv5::enr::NodeId::parse(&output).expect("Must be correct length"))
         }
-        PublicKey::Ed25519(pk) => {
-            let uncompressed_key_bytes = pk.encode();
+        KeyType::Ed25519 => {
+            let pk = public_key
+                .clone()
+                .try_into_ed25519()
+                .expect("right key type");
+            let uncompressed_key_bytes = pk.to_bytes();
             let mut output = [0_u8; 32];
             let mut hasher = Keccak::v256();
             hasher.update(&uncompressed_key_bytes);
             hasher.finalize(&mut output);
             Ok(discv5::enr::NodeId::parse(&output).expect("Must be correct length"))
         }
-        PublicKey::Ecdsa(_) => Err(format!(
-            "Unsupported public key (Ecdsa) from peer {}",
-            peer_id
-        )),
+
+        _ => Err(format!("Unsupported public key from peer {}", peer_id)),
     }
 }
 
 #[cfg(test)]
 mod tests {
+
     use super::*;
 
     #[test]
@@ -285,9 +304,9 @@ mod tests {
         let sk_bytes = hex::decode(sk_hex).unwrap();
         let secret_key = discv5::enr::k256::ecdsa::SigningKey::from_slice(&sk_bytes).unwrap();
 
-        let libp2p_sk = libp2p::identity::secp256k1::SecretKey::from_bytes(sk_bytes).unwrap();
-        let secp256k1_kp: libp2p::identity::secp256k1::Keypair = libp2p_sk.into();
-        let libp2p_kp = Keypair::Secp256k1(secp256k1_kp);
+        let libp2p_sk = secp256k1::SecretKey::try_from_bytes(sk_bytes).unwrap();
+        let secp256k1_kp: secp256k1::Keypair = libp2p_sk.into();
+        let libp2p_kp: Keypair = secp256k1_kp.into();
         let peer_id = libp2p_kp.public().to_peer_id();
 
         let enr = discv5::enr::EnrBuilder::new("v4")
@@ -306,9 +325,9 @@ mod tests {
             &sk_bytes.clone().try_into().unwrap(),
         );
 
-        let libp2p_sk = libp2p::identity::ed25519::SecretKey::from_bytes(sk_bytes).unwrap();
-        let secp256k1_kp: libp2p::identity::ed25519::Keypair = libp2p_sk.into();
-        let libp2p_kp = Keypair::Ed25519(secp256k1_kp);
+        let libp2p_sk = ed25519::SecretKey::try_from_bytes(sk_bytes).unwrap();
+        let secp256k1_kp: ed25519::Keypair = libp2p_sk.into();
+        let libp2p_kp: Keypair = secp256k1_kp.into();
         let peer_id = libp2p_kp.public().to_peer_id();
 
         let enr = discv5::enr::EnrBuilder::new("v4")
diff --git a/beacon_node/lighthouse_network/src/discovery/mod.rs b/beacon_node/lighthouse_network/src/discovery/mod.rs
index 3ee74ebf01..c3819f1eb9 100644
--- a/beacon_node/lighthouse_network/src/discovery/mod.rs
+++ b/beacon_node/lighthouse_network/src/discovery/mod.rs
@@ -7,28 +7,29 @@ pub(crate) mod enr;
 pub mod enr_ext;
 
 // Allow external use of the lighthouse ENR builder
-use crate::metrics;
 use crate::service::TARGET_SUBNET_PEERS;
 use crate::{error, Enr, NetworkConfig, NetworkGlobals, Subnet, SubnetDiscovery};
+use crate::{metrics, ClearDialError};
 use discv5::{enr::NodeId, Discv5, Discv5Event};
 pub use enr::{
     build_enr, create_enr_builder_from_config, load_enr_from_disk, use_or_load_enr, CombinedKey,
     Eth2Enr,
 };
 pub use enr_ext::{peer_id_to_node_id, CombinedKeyExt, EnrExt};
-pub use libp2p::core::identity::{Keypair, PublicKey};
+pub use libp2p::identity::{Keypair, PublicKey};
 
 use enr::{ATTESTATION_BITFIELD_ENR_KEY, ETH2_ENR_KEY, SYNC_COMMITTEE_BITFIELD_ENR_KEY};
 use futures::prelude::*;
 use futures::stream::FuturesUnordered;
 use libp2p::multiaddr::Protocol;
 use libp2p::swarm::behaviour::{DialFailure, FromSwarm};
-use libp2p::swarm::AddressScore;
+use libp2p::swarm::THandlerInEvent;
 pub use libp2p::{
-    core::{connection::ConnectionId, ConnectedPoint, Multiaddr, PeerId},
+    core::{ConnectedPoint, Multiaddr},
+    identity::PeerId,
     swarm::{
-        dummy::ConnectionHandler, DialError, NetworkBehaviour, NetworkBehaviourAction as NBAction,
-        NotifyHandler, PollParameters, SubstreamProtocol,
+        dummy::ConnectionHandler, ConnectionId, DialError, NetworkBehaviour, NotifyHandler,
+        PollParameters, SubstreamProtocol, ToSwarm,
     },
 };
 use lru::LruCache;
@@ -191,7 +192,7 @@ pub struct Discovery<TSpec: EthSpec> {
 impl<TSpec: EthSpec> Discovery<TSpec> {
     /// NOTE: Creating discovery requires running within a tokio execution environment.
     pub async fn new(
-        local_key: &Keypair,
+        local_key: Keypair,
         config: &NetworkConfig,
         network_globals: Arc<NetworkGlobals<TSpec>>,
         log: &slog::Logger,
@@ -646,7 +647,7 @@ impl<TSpec: EthSpec> Discovery<TSpec> {
                 if subnet_queries.len() == MAX_SUBNETS_IN_QUERY || self.queued_queries.is_empty() {
                     // This query is for searching for peers of a particular subnet
                     // Drain subnet_queries so we can re-use it as we continue to process the queue
-                    let grouped_queries: Vec<SubnetQuery> = subnet_queries.drain(..).collect();
+                    let grouped_queries: Vec<SubnetQuery> = std::mem::take(&mut subnet_queries);
                     self.start_subnet_query(grouped_queries);
                     processed = true;
                 }
@@ -925,22 +926,51 @@ impl<TSpec: EthSpec> Discovery<TSpec> {
 impl<TSpec: EthSpec> NetworkBehaviour for Discovery<TSpec> {
     // Discovery is not a real NetworkBehaviour...
     type ConnectionHandler = ConnectionHandler;
-    type OutEvent = DiscoveredPeers;
+    type ToSwarm = DiscoveredPeers;
 
-    fn new_handler(&mut self) -> Self::ConnectionHandler {
-        ConnectionHandler
+    fn handle_established_inbound_connection(
+        &mut self,
+        _connection_id: ConnectionId,
+        _peer: PeerId,
+        _local_addr: &Multiaddr,
+        _remote_addr: &Multiaddr,
+    ) -> Result<libp2p::swarm::THandler<Self>, libp2p::swarm::ConnectionDenied> {
+        // TODO: we might want to check discovery's banned ips here in the future.
+        Ok(ConnectionHandler)
     }
 
-    // Handles the libp2p request to obtain multiaddrs for peer_id's in order to dial them.
-    fn addresses_of_peer(&mut self, peer_id: &PeerId) -> Vec<Multiaddr> {
-        if let Some(enr) = self.enr_of_peer(peer_id) {
+    fn handle_established_outbound_connection(
+        &mut self,
+        _connection_id: ConnectionId,
+        _peer: PeerId,
+        _addr: &Multiaddr,
+        _role_override: libp2p::core::Endpoint,
+    ) -> Result<libp2p::swarm::THandler<Self>, libp2p::swarm::ConnectionDenied> {
+        Ok(ConnectionHandler)
+    }
+
+    fn on_connection_handler_event(
+        &mut self,
+        _peer_id: PeerId,
+        _connection_id: ConnectionId,
+        _event: void::Void,
+    ) {
+    }
+
+    fn handle_pending_outbound_connection(
+        &mut self,
+        _connection_id: ConnectionId,
+        maybe_peer: Option<PeerId>,
+        _addresses: &[Multiaddr],
+        _effective_role: libp2p::core::Endpoint,
+    ) -> Result<Vec<Multiaddr>, libp2p::swarm::ConnectionDenied> {
+        if let Some(enr) = maybe_peer.and_then(|peer_id| self.enr_of_peer(&peer_id)) {
             // ENR's may have multiple Multiaddrs. The multi-addr associated with the UDP
             // port is removed, which is assumed to be associated with the discv5 protocol (and
             // therefore irrelevant for other libp2p components).
-            enr.multiaddr_tcp()
+            Ok(enr.multiaddr_tcp())
         } else {
-            // PeerId is not known
-            Vec::new()
+            Ok(vec![])
         }
     }
 
@@ -949,7 +979,7 @@ impl<TSpec: EthSpec> NetworkBehaviour for Discovery<TSpec> {
         &mut self,
         cx: &mut Context,
         _: &mut impl PollParameters,
-    ) -> Poll<NBAction<Self::OutEvent, Self::ConnectionHandler>> {
+    ) -> Poll<ToSwarm<Self::ToSwarm, THandlerInEvent<Self>>> {
         if !self.started {
             return Poll::Pending;
         }
@@ -960,7 +990,7 @@ impl<TSpec: EthSpec> NetworkBehaviour for Discovery<TSpec> {
         // Drive the queries and return any results from completed queries
         if let Some(peers) = self.poll_queries(cx) {
             // return the result to the peer manager
-            return Poll::Ready(NBAction::GenerateEvent(DiscoveredPeers { peers }));
+            return Poll::Ready(ToSwarm::GenerateEvent(DiscoveredPeers { peers }));
         }
 
         // Process the server event stream
@@ -1034,10 +1064,7 @@ impl<TSpec: EthSpec> NetworkBehaviour for Discovery<TSpec> {
                             if let Some(address) = addr {
                                 // NOTE: This doesn't actually track the external TCP port. More sophisticated NAT handling
                                 // should handle this.
-                                return Poll::Ready(NBAction::ReportObservedAddr {
-                                    address,
-                                    score: AddressScore::Finite(1),
-                                });
+                                return Poll::Ready(ToSwarm::NewExternalAddrCandidate(address));
                             }
                         }
                         Discv5Event::EnrAdded { .. }
@@ -1065,8 +1092,9 @@ impl<TSpec: EthSpec> NetworkBehaviour for Discovery<TSpec> {
             | FromSwarm::ExpiredListenAddr(_)
             | FromSwarm::ListenerError(_)
             | FromSwarm::ListenerClosed(_)
-            | FromSwarm::NewExternalAddr(_)
-            | FromSwarm::ExpiredExternalAddr(_) => {
+            | FromSwarm::NewExternalAddrCandidate(_)
+            | FromSwarm::ExternalAddrExpired(_)
+            | FromSwarm::ExternalAddrConfirmed(_) => {
                 // Ignore events not relevant to discovery
             }
         }
@@ -1077,20 +1105,16 @@ impl<TSpec: EthSpec> Discovery<TSpec> {
     fn on_dial_failure(&mut self, peer_id: Option<PeerId>, error: &DialError) {
         if let Some(peer_id) = peer_id {
             match error {
-                DialError::Banned
-                | DialError::LocalPeerId
-                | DialError::InvalidPeerId(_)
-                | DialError::ConnectionIo(_)
+                DialError::LocalPeerId { .. }
+                | DialError::Denied { .. }
                 | DialError::NoAddresses
                 | DialError::Transport(_)
                 | DialError::WrongPeerId { .. } => {
                     // set peer as disconnected in discovery DHT
-                    debug!(self.log, "Marking peer disconnected in DHT"; "peer_id" => %peer_id);
+                    debug!(self.log, "Marking peer disconnected in DHT"; "peer_id" => %peer_id, "error" => %ClearDialError(error));
                     self.disconnect_peer(&peer_id);
                 }
-                DialError::ConnectionLimit(_)
-                | DialError::DialPeerConditionFalse(_)
-                | DialError::Aborted => {}
+                DialError::DialPeerConditionFalse(_) | DialError::Aborted => {}
             }
         }
     }
@@ -1101,6 +1125,7 @@ mod tests {
     use super::*;
     use crate::rpc::methods::{MetaData, MetaDataV2};
     use enr::EnrBuilder;
+    use libp2p::identity::secp256k1;
     use slog::{o, Drain};
     use types::{BitVector, MinimalEthSpec, SubnetId};
 
@@ -1119,10 +1144,10 @@ mod tests {
     }
 
     async fn build_discovery() -> Discovery<E> {
-        let keypair = libp2p::identity::Keypair::generate_secp256k1();
+        let keypair = secp256k1::Keypair::generate();
         let mut config = NetworkConfig::default();
         config.set_listening_addr(crate::ListenAddress::unused_v4_ports());
-        let enr_key: CombinedKey = CombinedKey::from_libp2p(&keypair).unwrap();
+        let enr_key: CombinedKey = CombinedKey::from_secp256k1(&keypair);
         let enr: Enr = build_enr::<E>(&enr_key, &config, &EnrForkId::default()).unwrap();
         let log = build_log(slog::Level::Debug, false);
         let globals = NetworkGlobals::new(
@@ -1138,7 +1163,8 @@ mod tests {
             false,
             &log,
         );
-        Discovery::new(&keypair, &config, Arc::new(globals), &log)
+        let keypair = keypair.into();
+        Discovery::new(keypair, &config, Arc::new(globals), &log)
             .await
             .unwrap()
     }
@@ -1184,8 +1210,8 @@ mod tests {
 
     fn make_enr(subnet_ids: Vec<usize>) -> Enr {
         let mut builder = EnrBuilder::new("v4");
-        let keypair = libp2p::identity::Keypair::generate_secp256k1();
-        let enr_key: CombinedKey = CombinedKey::from_libp2p(&keypair).unwrap();
+        let keypair = secp256k1::Keypair::generate();
+        let enr_key: CombinedKey = CombinedKey::from_secp256k1(&keypair);
 
         // set the "attnets" field on our ENR
         let mut bitfield = BitVector::<ssz_types::typenum::U64>::new();
diff --git a/beacon_node/lighthouse_network/src/lib.rs b/beacon_node/lighthouse_network/src/lib.rs
index 3d539af3b2..7467fb7f06 100644
--- a/beacon_node/lighthouse_network/src/lib.rs
+++ b/beacon_node/lighthouse_network/src/lib.rs
@@ -17,6 +17,7 @@ pub mod rpc;
 pub mod types;
 
 pub use config::gossip_max_size;
+use libp2p::swarm::DialError;
 pub use listen_addr::*;
 
 use serde::{de, Deserialize, Deserializer, Serialize, Serializer};
@@ -63,6 +64,46 @@ impl<'de> Deserialize<'de> for PeerIdSerialized {
     }
 }
 
+// A wrapper struct that prints a dial error nicely.
+struct ClearDialError<'a>(&'a DialError);
+
+impl<'a> ClearDialError<'a> {
+    fn most_inner_error(err: &(dyn std::error::Error)) -> &(dyn std::error::Error) {
+        let mut current = err;
+        while let Some(source) = current.source() {
+            current = source;
+        }
+        current
+    }
+}
+
+impl<'a> std::fmt::Display for ClearDialError<'a> {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> Result<(), std::fmt::Error> {
+        match &self.0 {
+            DialError::Transport(errors) => {
+                for (_, transport_error) in errors {
+                    match transport_error {
+                        libp2p::TransportError::MultiaddrNotSupported(multiaddr_error) => {
+                            write!(f, "Multiaddr not supported: {multiaddr_error}")?;
+                        }
+                        libp2p::TransportError::Other(other_error) => {
+                            let inner_error = ClearDialError::most_inner_error(other_error);
+                            write!(f, "Transport error: {inner_error}")?;
+                        }
+                    }
+                }
+                Ok(())
+            }
+            DialError::LocalPeerId { .. } => write!(f, "The peer being dialed is the local peer."),
+            DialError::NoAddresses => write!(f, "No addresses for the peer to dial."),
+            DialError::DialPeerConditionFalse(_) => write!(f, "PeerCondition evaluation failed."),
+            DialError::Aborted => write!(f, "Connection aborted."),
+            DialError::WrongPeerId { .. } => write!(f, "Wrong peer id."),
+            DialError::Denied { cause } => write!(f, "Connection denied: {:?}", cause),
+        }
+    }
+}
+
 pub use crate::types::{
     error, Enr, EnrSyncCommitteeBitfield, GossipTopic, NetworkGlobals, PubsubMessage, Subnet,
     SubnetDiscovery,
diff --git a/beacon_node/lighthouse_network/src/peer_manager/mod.rs b/beacon_node/lighthouse_network/src/peer_manager/mod.rs
index c6c737caed..f6158ed3a0 100644
--- a/beacon_node/lighthouse_network/src/peer_manager/mod.rs
+++ b/beacon_node/lighthouse_network/src/peer_manager/mod.rs
@@ -21,7 +21,8 @@ use std::{
 use strum::IntoEnumIterator;
 use types::{EthSpec, SyncSubnetId};
 
-pub use libp2p::core::{identity::Keypair, Multiaddr};
+pub use libp2p::core::Multiaddr;
+pub use libp2p::identity::Keypair;
 
 #[allow(clippy::mutable_key_type)] // PeerId in hashmaps are no longer permitted by clippy
 pub mod peerdb;
@@ -968,6 +969,7 @@ impl<TSpec: EthSpec> PeerManager<TSpec> {
 
         macro_rules! prune_peers {
             ($filter: expr) => {
+                let filter = $filter;
                 for (peer_id, info) in self
                     .network_globals
                     .peers
@@ -975,7 +977,7 @@ impl<TSpec: EthSpec> PeerManager<TSpec> {
                     .worst_connected_peers()
                     .iter()
                     .filter(|(_, info)| {
-                        !info.has_future_duty() && !info.is_trusted() && $filter(*info)
+                        !info.has_future_duty() && !info.is_trusted() && filter(*info)
                     })
                 {
                     if peers_to_prune.len()
diff --git a/beacon_node/lighthouse_network/src/peer_manager/network_behaviour.rs b/beacon_node/lighthouse_network/src/peer_manager/network_behaviour.rs
index 24de83a61d..70f421681a 100644
--- a/beacon_node/lighthouse_network/src/peer_manager/network_behaviour.rs
+++ b/beacon_node/lighthouse_network/src/peer_manager/network_behaviour.rs
@@ -1,38 +1,44 @@
+//! Implementation of [`NetworkBehaviour`] for the [`PeerManager`].
+
 use std::task::{Context, Poll};
 
 use futures::StreamExt;
 use libp2p::core::ConnectedPoint;
+use libp2p::identity::PeerId;
 use libp2p::swarm::behaviour::{ConnectionClosed, ConnectionEstablished, DialFailure, FromSwarm};
 use libp2p::swarm::dial_opts::{DialOpts, PeerCondition};
 use libp2p::swarm::dummy::ConnectionHandler;
-use libp2p::swarm::{NetworkBehaviour, NetworkBehaviourAction, PollParameters};
-use libp2p::PeerId;
+use libp2p::swarm::{ConnectionId, NetworkBehaviour, PollParameters, ToSwarm};
 use slog::{debug, error};
 use types::EthSpec;
 
-use crate::metrics;
 use crate::rpc::GoodbyeReason;
 use crate::types::SyncState;
+use crate::{metrics, ClearDialError};
 
 use super::peerdb::BanResult;
 use super::{ConnectingType, PeerManager, PeerManagerEvent, ReportSource};
 
 impl<TSpec: EthSpec> NetworkBehaviour for PeerManager<TSpec> {
     type ConnectionHandler = ConnectionHandler;
-
-    type OutEvent = PeerManagerEvent;
+    type ToSwarm = PeerManagerEvent;
 
     /* Required trait members */
 
-    fn new_handler(&mut self) -> Self::ConnectionHandler {
-        ConnectionHandler
+    fn on_connection_handler_event(
+        &mut self,
+        _peer_id: PeerId,
+        _connection_id: ConnectionId,
+        _event: libp2p::swarm::THandlerOutEvent<Self>,
+    ) {
+        // no events from the dummy handler
     }
 
     fn poll(
         &mut self,
         cx: &mut Context<'_>,
         _params: &mut impl PollParameters,
-    ) -> Poll<NetworkBehaviourAction<Self::OutEvent, Self::ConnectionHandler>> {
+    ) -> Poll<ToSwarm<Self::ToSwarm, void::Void>> {
         // perform the heartbeat when necessary
         while self.heartbeat.poll_tick(cx).is_ready() {
             self.heartbeat();
@@ -84,19 +90,17 @@ impl<TSpec: EthSpec> NetworkBehaviour for PeerManager<TSpec> {
         }
 
         if !self.events.is_empty() {
-            return Poll::Ready(NetworkBehaviourAction::GenerateEvent(self.events.remove(0)));
+            return Poll::Ready(ToSwarm::GenerateEvent(self.events.remove(0)));
         } else {
             self.events.shrink_to_fit();
         }
 
         if let Some((peer_id, maybe_enr)) = self.peers_to_dial.pop_first() {
             self.inject_peer_connection(&peer_id, ConnectingType::Dialing, maybe_enr);
-            let handler = self.new_handler();
-            return Poll::Ready(NetworkBehaviourAction::Dial {
+            return Poll::Ready(ToSwarm::Dial {
                 opts: DialOpts::peer_id(peer_id)
                     .condition(PeerCondition::Disconnected)
                     .build(),
-                handler,
             });
         }
 
@@ -110,13 +114,31 @@ impl<TSpec: EthSpec> NetworkBehaviour for PeerManager<TSpec> {
                 endpoint,
                 other_established,
                 ..
-            }) => self.on_connection_established(peer_id, endpoint, other_established),
+            }) => {
+                // NOTE: We still need to handle the [`ConnectionEstablished`] because the
+                // [`NetworkBehaviour::handle_established_inbound_connection`] and
+                // [`NetworkBehaviour::handle_established_outbound_connection`] are fallible. This
+                // means another behaviour can kill the connection early, and we can't assume a
+                // peer as connected until this event is received.
+                self.on_connection_established(peer_id, endpoint, other_established)
+            }
             FromSwarm::ConnectionClosed(ConnectionClosed {
                 peer_id,
                 remaining_established,
                 ..
             }) => self.on_connection_closed(peer_id, remaining_established),
-            FromSwarm::DialFailure(DialFailure { peer_id, .. }) => self.on_dial_failure(peer_id),
+            FromSwarm::DialFailure(DialFailure {
+                peer_id,
+                error,
+                connection_id: _,
+            }) => {
+                debug!(self.log, "Failed to dial peer"; "peer_id"=> ?peer_id, "error" => %ClearDialError(error));
+                self.on_dial_failure(peer_id);
+            }
+            FromSwarm::ExternalAddrConfirmed(_) => {
+                // TODO: we likely want to check this against our assumed external tcp
+                // address
+            }
             FromSwarm::AddressChange(_)
             | FromSwarm::ListenFailure(_)
             | FromSwarm::NewListener(_)
@@ -124,13 +146,35 @@ impl<TSpec: EthSpec> NetworkBehaviour for PeerManager<TSpec> {
             | FromSwarm::ExpiredListenAddr(_)
             | FromSwarm::ListenerError(_)
             | FromSwarm::ListenerClosed(_)
-            | FromSwarm::NewExternalAddr(_)
-            | FromSwarm::ExpiredExternalAddr(_) => {
+            | FromSwarm::NewExternalAddrCandidate(_)
+            | FromSwarm::ExternalAddrExpired(_) => {
                 // The rest of the events we ignore since they are handled in their associated
                 // `SwarmEvent`
             }
         }
     }
+
+    fn handle_established_inbound_connection(
+        &mut self,
+        _connection_id: ConnectionId,
+        _peer: PeerId,
+        _local_addr: &libp2p::Multiaddr,
+        _remote_addr: &libp2p::Multiaddr,
+    ) -> Result<libp2p::swarm::THandler<Self>, libp2p::swarm::ConnectionDenied> {
+        // TODO: we might want to check if we accept this peer or not in the future.
+        Ok(ConnectionHandler)
+    }
+
+    fn handle_established_outbound_connection(
+        &mut self,
+        _connection_id: ConnectionId,
+        _peer: PeerId,
+        _addr: &libp2p::Multiaddr,
+        _role_override: libp2p::core::Endpoint,
+    ) -> Result<libp2p::swarm::THandler<Self>, libp2p::swarm::ConnectionDenied> {
+        // TODO: we might want to check if we accept this peer or not in the future.
+        Ok(ConnectionHandler)
+    }
 }
 
 impl<TSpec: EthSpec> PeerManager<TSpec> {
diff --git a/beacon_node/lighthouse_network/src/rpc/codec/base.rs b/beacon_node/lighthouse_network/src/rpc/codec/base.rs
index d568f27897..943d4a3bce 100644
--- a/beacon_node/lighthouse_network/src/rpc/codec/base.rs
+++ b/beacon_node/lighthouse_network/src/rpc/codec/base.rs
@@ -217,9 +217,12 @@ mod tests {
         let snappy_protocol_id = ProtocolId::new(SupportedProtocol::StatusV1, Encoding::SSZSnappy);
 
         let fork_context = Arc::new(fork_context(ForkName::Base));
+
+        let chain_spec = Spec::default_spec();
+
         let mut snappy_outbound_codec = SSZSnappyOutboundCodec::<Spec>::new(
             snappy_protocol_id,
-            max_rpc_size(&fork_context),
+            max_rpc_size(&fork_context, chain_spec.max_chunk_size as usize),
             fork_context,
         );
 
@@ -251,9 +254,12 @@ mod tests {
         let snappy_protocol_id = ProtocolId::new(SupportedProtocol::StatusV1, Encoding::SSZSnappy);
 
         let fork_context = Arc::new(fork_context(ForkName::Base));
+
+        let chain_spec = Spec::default_spec();
+
         let mut snappy_outbound_codec = SSZSnappyOutboundCodec::<Spec>::new(
             snappy_protocol_id,
-            max_rpc_size(&fork_context),
+            max_rpc_size(&fork_context, chain_spec.max_chunk_size as usize),
             fork_context,
         );
 
@@ -279,7 +285,10 @@ mod tests {
 
         // Response limits
         let fork_context = Arc::new(fork_context(ForkName::Base));
-        let max_rpc_size = max_rpc_size(&fork_context);
+
+        let chain_spec = Spec::default_spec();
+
+        let max_rpc_size = max_rpc_size(&fork_context, chain_spec.max_chunk_size as usize);
         let limit = protocol_id.rpc_response_limits::<Spec>(&fork_context);
         let mut max = encode_len(limit.max + 1);
         let mut codec = SSZSnappyOutboundCodec::<Spec>::new(
diff --git a/beacon_node/lighthouse_network/src/rpc/codec/ssz_snappy.rs b/beacon_node/lighthouse_network/src/rpc/codec/ssz_snappy.rs
index 39cf8b3eb2..f1d94da7ec 100644
--- a/beacon_node/lighthouse_network/src/rpc/codec/ssz_snappy.rs
+++ b/beacon_node/lighthouse_network/src/rpc/codec/ssz_snappy.rs
@@ -615,8 +615,8 @@ mod tests {
     };
     use std::sync::Arc;
     use types::{
-        BeaconBlock, BeaconBlockAltair, BeaconBlockBase, BeaconBlockMerge, EmptyBlock, Epoch,
-        ForkContext, FullPayload, Hash256, Signature, SignedBeaconBlock, Slot,
+        BeaconBlock, BeaconBlockAltair, BeaconBlockBase, BeaconBlockMerge, ChainSpec, EmptyBlock,
+        Epoch, ForkContext, FullPayload, Hash256, Signature, SignedBeaconBlock, Slot,
     };
 
     use snap::write::FrameEncoder;
@@ -658,7 +658,7 @@ mod tests {
     }
 
     /// Merge block with length < max_rpc_size.
-    fn merge_block_small(fork_context: &ForkContext) -> SignedBeaconBlock<Spec> {
+    fn merge_block_small(fork_context: &ForkContext, spec: &ChainSpec) -> SignedBeaconBlock<Spec> {
         let mut block: BeaconBlockMerge<_, FullPayload<Spec>> =
             BeaconBlockMerge::empty(&Spec::default_spec());
         let tx = VariableList::from(vec![0; 1024]);
@@ -667,14 +667,14 @@ mod tests {
         block.body.execution_payload.execution_payload.transactions = txs;
 
         let block = BeaconBlock::Merge(block);
-        assert!(block.ssz_bytes_len() <= max_rpc_size(fork_context));
+        assert!(block.ssz_bytes_len() <= max_rpc_size(fork_context, spec.max_chunk_size as usize));
         SignedBeaconBlock::from_block(block, Signature::empty())
     }
 
     /// Merge block with length > MAX_RPC_SIZE.
     /// The max limit for a merge block is in the order of ~16GiB which wouldn't fit in memory.
     /// Hence, we generate a merge block just greater than `MAX_RPC_SIZE` to test rejection on the rpc layer.
-    fn merge_block_large(fork_context: &ForkContext) -> SignedBeaconBlock<Spec> {
+    fn merge_block_large(fork_context: &ForkContext, spec: &ChainSpec) -> SignedBeaconBlock<Spec> {
         let mut block: BeaconBlockMerge<_, FullPayload<Spec>> =
             BeaconBlockMerge::empty(&Spec::default_spec());
         let tx = VariableList::from(vec![0; 1024]);
@@ -683,7 +683,7 @@ mod tests {
         block.body.execution_payload.execution_payload.transactions = txs;
 
         let block = BeaconBlock::Merge(block);
-        assert!(block.ssz_bytes_len() > max_rpc_size(fork_context));
+        assert!(block.ssz_bytes_len() > max_rpc_size(fork_context, spec.max_chunk_size as usize));
         SignedBeaconBlock::from_block(block, Signature::empty())
     }
 
@@ -737,10 +737,11 @@ mod tests {
         protocol: SupportedProtocol,
         message: RPCCodedResponse<Spec>,
         fork_name: ForkName,
+        spec: &ChainSpec,
     ) -> Result<BytesMut, RPCError> {
         let snappy_protocol_id = ProtocolId::new(protocol, Encoding::SSZSnappy);
         let fork_context = Arc::new(fork_context(fork_name));
-        let max_packet_size = max_rpc_size(&fork_context);
+        let max_packet_size = max_rpc_size(&fork_context, spec.max_chunk_size as usize);
 
         let mut buf = BytesMut::new();
         let mut snappy_inbound_codec =
@@ -783,10 +784,11 @@ mod tests {
         protocol: SupportedProtocol,
         message: &mut BytesMut,
         fork_name: ForkName,
+        spec: &ChainSpec,
     ) -> Result<Option<RPCResponse<Spec>>, RPCError> {
         let snappy_protocol_id = ProtocolId::new(protocol, Encoding::SSZSnappy);
         let fork_context = Arc::new(fork_context(fork_name));
-        let max_packet_size = max_rpc_size(&fork_context);
+        let max_packet_size = max_rpc_size(&fork_context, spec.max_chunk_size as usize);
         let mut snappy_outbound_codec =
             SSZSnappyOutboundCodec::<Spec>::new(snappy_protocol_id, max_packet_size, fork_context);
         // decode message just as snappy message
@@ -798,15 +800,20 @@ mod tests {
         protocol: SupportedProtocol,
         message: RPCCodedResponse<Spec>,
         fork_name: ForkName,
+        spec: &ChainSpec,
     ) -> Result<Option<RPCResponse<Spec>>, RPCError> {
-        let mut encoded = encode_response(protocol, message, fork_name)?;
-        decode_response(protocol, &mut encoded, fork_name)
+        let mut encoded = encode_response(protocol, message, fork_name, spec)?;
+        decode_response(protocol, &mut encoded, fork_name, spec)
     }
 
     /// Verifies that requests we send are encoded in a way that we would correctly decode too.
-    fn encode_then_decode_request(req: OutboundRequest<Spec>, fork_name: ForkName) {
+    fn encode_then_decode_request(
+        req: OutboundRequest<Spec>,
+        fork_name: ForkName,
+        spec: &ChainSpec,
+    ) {
         let fork_context = Arc::new(fork_context(fork_name));
-        let max_packet_size = max_rpc_size(&fork_context);
+        let max_packet_size = max_rpc_size(&fork_context, spec.max_chunk_size as usize);
         let protocol = ProtocolId::new(req.versioned_protocol(), Encoding::SSZSnappy);
         // Encode a request we send
         let mut buf = BytesMut::new();
@@ -851,11 +858,14 @@ mod tests {
     // Test RPCResponse encoding/decoding for V1 messages
     #[test]
     fn test_encode_then_decode_v1() {
+        let chain_spec = Spec::default_spec();
+
         assert_eq!(
             encode_then_decode_response(
                 SupportedProtocol::StatusV1,
                 RPCCodedResponse::Success(RPCResponse::Status(status_message())),
                 ForkName::Base,
+                &chain_spec,
             ),
             Ok(Some(RPCResponse::Status(status_message())))
         );
@@ -865,6 +875,7 @@ mod tests {
                 SupportedProtocol::PingV1,
                 RPCCodedResponse::Success(RPCResponse::Pong(ping_message())),
                 ForkName::Base,
+                &chain_spec,
             ),
             Ok(Some(RPCResponse::Pong(ping_message())))
         );
@@ -874,6 +885,7 @@ mod tests {
                 SupportedProtocol::BlocksByRangeV1,
                 RPCCodedResponse::Success(RPCResponse::BlocksByRange(Arc::new(empty_base_block()))),
                 ForkName::Base,
+                &chain_spec,
             ),
             Ok(Some(RPCResponse::BlocksByRange(Arc::new(
                 empty_base_block()
@@ -886,6 +898,7 @@ mod tests {
                     SupportedProtocol::BlocksByRangeV1,
                     RPCCodedResponse::Success(RPCResponse::BlocksByRange(Arc::new(altair_block()))),
                     ForkName::Altair,
+                    &chain_spec,
                 )
                 .unwrap_err(),
                 RPCError::SSZDecodeError(_)
@@ -898,6 +911,7 @@ mod tests {
                 SupportedProtocol::BlocksByRootV1,
                 RPCCodedResponse::Success(RPCResponse::BlocksByRoot(Arc::new(empty_base_block()))),
                 ForkName::Base,
+                &chain_spec,
             ),
             Ok(Some(RPCResponse::BlocksByRoot(
                 Arc::new(empty_base_block())
@@ -910,6 +924,7 @@ mod tests {
                     SupportedProtocol::BlocksByRootV1,
                     RPCCodedResponse::Success(RPCResponse::BlocksByRoot(Arc::new(altair_block()))),
                     ForkName::Altair,
+                    &chain_spec,
                 )
                 .unwrap_err(),
                 RPCError::SSZDecodeError(_)
@@ -922,6 +937,7 @@ mod tests {
                 SupportedProtocol::MetaDataV1,
                 RPCCodedResponse::Success(RPCResponse::MetaData(metadata())),
                 ForkName::Base,
+                &chain_spec,
             ),
             Ok(Some(RPCResponse::MetaData(metadata()))),
         );
@@ -932,6 +948,7 @@ mod tests {
                 SupportedProtocol::MetaDataV1,
                 RPCCodedResponse::Success(RPCResponse::MetaData(metadata_v2())),
                 ForkName::Base,
+                &chain_spec,
             ),
             Ok(Some(RPCResponse::MetaData(metadata()))),
         );
@@ -940,11 +957,14 @@ mod tests {
     // Test RPCResponse encoding/decoding for V1 messages
     #[test]
     fn test_encode_then_decode_v2() {
+        let chain_spec = Spec::default_spec();
+
         assert_eq!(
             encode_then_decode_response(
                 SupportedProtocol::BlocksByRangeV2,
                 RPCCodedResponse::Success(RPCResponse::BlocksByRange(Arc::new(empty_base_block()))),
                 ForkName::Base,
+                &chain_spec,
             ),
             Ok(Some(RPCResponse::BlocksByRange(Arc::new(
                 empty_base_block()
@@ -959,6 +979,7 @@ mod tests {
                 SupportedProtocol::BlocksByRangeV2,
                 RPCCodedResponse::Success(RPCResponse::BlocksByRange(Arc::new(empty_base_block()))),
                 ForkName::Altair,
+                &chain_spec,
             ),
             Ok(Some(RPCResponse::BlocksByRange(Arc::new(
                 empty_base_block()
@@ -970,12 +991,13 @@ mod tests {
                 SupportedProtocol::BlocksByRangeV2,
                 RPCCodedResponse::Success(RPCResponse::BlocksByRange(Arc::new(altair_block()))),
                 ForkName::Altair,
+                &chain_spec,
             ),
             Ok(Some(RPCResponse::BlocksByRange(Arc::new(altair_block()))))
         );
 
-        let merge_block_small = merge_block_small(&fork_context(ForkName::Merge));
-        let merge_block_large = merge_block_large(&fork_context(ForkName::Merge));
+        let merge_block_small = merge_block_small(&fork_context(ForkName::Merge), &chain_spec);
+        let merge_block_large = merge_block_large(&fork_context(ForkName::Merge), &chain_spec);
 
         assert_eq!(
             encode_then_decode_response(
@@ -984,6 +1006,7 @@ mod tests {
                     merge_block_small.clone()
                 ))),
                 ForkName::Merge,
+                &chain_spec,
             ),
             Ok(Some(RPCResponse::BlocksByRange(Arc::new(
                 merge_block_small.clone()
@@ -1000,6 +1023,7 @@ mod tests {
                     SupportedProtocol::BlocksByRangeV2,
                     &mut encoded,
                     ForkName::Merge,
+                    &chain_spec,
                 )
                 .unwrap_err(),
                 RPCError::InvalidData(_)
@@ -1012,6 +1036,7 @@ mod tests {
                 SupportedProtocol::BlocksByRootV2,
                 RPCCodedResponse::Success(RPCResponse::BlocksByRoot(Arc::new(empty_base_block()))),
                 ForkName::Base,
+                &chain_spec,
             ),
             Ok(Some(RPCResponse::BlocksByRoot(
                 Arc::new(empty_base_block())
@@ -1026,6 +1051,7 @@ mod tests {
                 SupportedProtocol::BlocksByRootV2,
                 RPCCodedResponse::Success(RPCResponse::BlocksByRoot(Arc::new(empty_base_block()))),
                 ForkName::Altair,
+                &chain_spec,
             ),
             Ok(Some(RPCResponse::BlocksByRoot(
                 Arc::new(empty_base_block())
@@ -1037,6 +1063,7 @@ mod tests {
                 SupportedProtocol::BlocksByRootV2,
                 RPCCodedResponse::Success(RPCResponse::BlocksByRoot(Arc::new(altair_block()))),
                 ForkName::Altair,
+                &chain_spec,
             ),
             Ok(Some(RPCResponse::BlocksByRoot(Arc::new(altair_block()))))
         );
@@ -1048,6 +1075,7 @@ mod tests {
                     merge_block_small.clone()
                 ))),
                 ForkName::Merge,
+                &chain_spec,
             ),
             Ok(Some(RPCResponse::BlocksByRoot(Arc::new(merge_block_small))))
         );
@@ -1062,6 +1090,7 @@ mod tests {
                     SupportedProtocol::BlocksByRootV2,
                     &mut encoded,
                     ForkName::Merge,
+                    &chain_spec,
                 )
                 .unwrap_err(),
                 RPCError::InvalidData(_)
@@ -1075,6 +1104,7 @@ mod tests {
                 SupportedProtocol::MetaDataV2,
                 RPCCodedResponse::Success(RPCResponse::MetaData(metadata())),
                 ForkName::Base,
+                &chain_spec,
             ),
             Ok(Some(RPCResponse::MetaData(metadata_v2())))
         );
@@ -1084,6 +1114,7 @@ mod tests {
                 SupportedProtocol::MetaDataV2,
                 RPCCodedResponse::Success(RPCResponse::MetaData(metadata_v2())),
                 ForkName::Altair,
+                &chain_spec,
             ),
             Ok(Some(RPCResponse::MetaData(metadata_v2())))
         );
@@ -1094,11 +1125,14 @@ mod tests {
     fn test_context_bytes_v2() {
         let fork_context = fork_context(ForkName::Altair);
 
+        let chain_spec = Spec::default_spec();
+
         // Removing context bytes for v2 messages should error
         let mut encoded_bytes = encode_response(
             SupportedProtocol::BlocksByRangeV2,
             RPCCodedResponse::Success(RPCResponse::BlocksByRange(Arc::new(empty_base_block()))),
             ForkName::Base,
+            &chain_spec,
         )
         .unwrap();
 
@@ -1108,7 +1142,8 @@ mod tests {
             decode_response(
                 SupportedProtocol::BlocksByRangeV2,
                 &mut encoded_bytes,
-                ForkName::Base
+                ForkName::Base,
+                &chain_spec,
             )
             .unwrap_err(),
             RPCError::ErrorResponse(RPCResponseErrorCode::InvalidRequest, _),
@@ -1118,6 +1153,7 @@ mod tests {
             SupportedProtocol::BlocksByRootV2,
             RPCCodedResponse::Success(RPCResponse::BlocksByRoot(Arc::new(empty_base_block()))),
             ForkName::Base,
+            &chain_spec,
         )
         .unwrap();
 
@@ -1127,7 +1163,8 @@ mod tests {
             decode_response(
                 SupportedProtocol::BlocksByRangeV2,
                 &mut encoded_bytes,
-                ForkName::Base
+                ForkName::Base,
+                &chain_spec,
             )
             .unwrap_err(),
             RPCError::ErrorResponse(RPCResponseErrorCode::InvalidRequest, _),
@@ -1138,6 +1175,7 @@ mod tests {
             SupportedProtocol::BlocksByRangeV2,
             RPCCodedResponse::Success(RPCResponse::BlocksByRange(Arc::new(empty_base_block()))),
             ForkName::Altair,
+            &chain_spec,
         )
         .unwrap();
 
@@ -1150,7 +1188,8 @@ mod tests {
             decode_response(
                 SupportedProtocol::BlocksByRangeV2,
                 &mut wrong_fork_bytes,
-                ForkName::Altair
+                ForkName::Altair,
+                &chain_spec,
             )
             .unwrap_err(),
             RPCError::SSZDecodeError(_),
@@ -1161,6 +1200,7 @@ mod tests {
             SupportedProtocol::BlocksByRootV2,
             RPCCodedResponse::Success(RPCResponse::BlocksByRoot(Arc::new(altair_block()))),
             ForkName::Altair,
+            &chain_spec,
         )
         .unwrap();
 
@@ -1172,7 +1212,8 @@ mod tests {
             decode_response(
                 SupportedProtocol::BlocksByRangeV2,
                 &mut wrong_fork_bytes,
-                ForkName::Altair
+                ForkName::Altair,
+                &chain_spec,
             )
             .unwrap_err(),
             RPCError::SSZDecodeError(_),
@@ -1186,6 +1227,7 @@ mod tests {
                 SupportedProtocol::MetaDataV2,
                 RPCCodedResponse::Success(RPCResponse::MetaData(metadata())),
                 ForkName::Altair,
+                &chain_spec,
             )
             .unwrap(),
         );
@@ -1193,7 +1235,8 @@ mod tests {
         assert!(decode_response(
             SupportedProtocol::MetaDataV2,
             &mut encoded_bytes,
-            ForkName::Altair
+            ForkName::Altair,
+            &chain_spec,
         )
         .is_err());
 
@@ -1202,6 +1245,7 @@ mod tests {
             SupportedProtocol::BlocksByRootV2,
             RPCCodedResponse::Success(RPCResponse::BlocksByRoot(Arc::new(empty_base_block()))),
             ForkName::Altair,
+            &chain_spec,
         )
         .unwrap();
 
@@ -1213,7 +1257,8 @@ mod tests {
             decode_response(
                 SupportedProtocol::BlocksByRangeV2,
                 &mut wrong_fork_bytes,
-                ForkName::Altair
+                ForkName::Altair,
+                &chain_spec,
             )
             .unwrap_err(),
             RPCError::ErrorResponse(RPCResponseErrorCode::InvalidRequest, _),
@@ -1224,6 +1269,7 @@ mod tests {
             SupportedProtocol::BlocksByRootV2,
             RPCCodedResponse::Success(RPCResponse::BlocksByRoot(Arc::new(empty_base_block()))),
             ForkName::Altair,
+            &chain_spec,
         )
         .unwrap();
 
@@ -1233,7 +1279,8 @@ mod tests {
             decode_response(
                 SupportedProtocol::BlocksByRangeV2,
                 &mut part,
-                ForkName::Altair
+                ForkName::Altair,
+                &chain_spec,
             ),
             Ok(None)
         )
@@ -1252,9 +1299,12 @@ mod tests {
             OutboundRequest::MetaData(MetadataRequest::new_v1()),
             OutboundRequest::MetaData(MetadataRequest::new_v2()),
         ];
+
+        let chain_spec = Spec::default_spec();
+
         for req in requests.iter() {
             for fork_name in ForkName::list_all() {
-                encode_then_decode_request(req.clone(), fork_name);
+                encode_then_decode_request(req.clone(), fork_name, &chain_spec);
             }
         }
     }
@@ -1308,9 +1358,16 @@ mod tests {
         assert_eq!(writer.get_ref().len(), 42);
         dst.extend_from_slice(writer.get_ref());
 
+        let chain_spec = Spec::default_spec();
         // 10 (for stream identifier) + 80 + 42 = 132 > `max_compressed_len`. Hence, decoding should fail with `InvalidData`.
         assert!(matches!(
-            decode_response(SupportedProtocol::StatusV1, &mut dst, ForkName::Base).unwrap_err(),
+            decode_response(
+                SupportedProtocol::StatusV1,
+                &mut dst,
+                ForkName::Base,
+                &chain_spec
+            )
+            .unwrap_err(),
             RPCError::InvalidData(_)
         ));
     }
@@ -1365,12 +1422,15 @@ mod tests {
         assert_eq!(writer.get_ref().len(), 8103);
         dst.extend_from_slice(writer.get_ref());
 
+        let chain_spec = Spec::default_spec();
+
         // 10 (for stream identifier) + 176156 + 8103 = 184269 > `max_compressed_len`. Hence, decoding should fail with `InvalidData`.
         assert!(matches!(
             decode_response(
                 SupportedProtocol::BlocksByRangeV2,
                 &mut dst,
-                ForkName::Altair
+                ForkName::Altair,
+                &chain_spec,
             )
             .unwrap_err(),
             RPCError::InvalidData(_)
@@ -1398,8 +1458,12 @@ mod tests {
         let mut uvi_codec: Uvi<usize> = Uvi::default();
         let mut dst = BytesMut::with_capacity(1024);
 
+        let chain_spec = Spec::default_spec();
+
         // Insert length-prefix
-        uvi_codec.encode(MAX_RPC_SIZE + 1, &mut dst).unwrap();
+        uvi_codec
+            .encode(chain_spec.max_chunk_size as usize + 1, &mut dst)
+            .unwrap();
 
         // Insert snappy stream identifier
         dst.extend_from_slice(stream_identifier);
@@ -1411,7 +1475,13 @@ mod tests {
         dst.extend_from_slice(writer.get_ref());
 
         assert!(matches!(
-            decode_response(SupportedProtocol::StatusV1, &mut dst, ForkName::Base).unwrap_err(),
+            decode_response(
+                SupportedProtocol::StatusV1,
+                &mut dst,
+                ForkName::Base,
+                &chain_spec
+            )
+            .unwrap_err(),
             RPCError::InvalidData(_)
         ));
     }
diff --git a/beacon_node/lighthouse_network/src/rpc/handler.rs b/beacon_node/lighthouse_network/src/rpc/handler.rs
index 8199bee2a7..36a5abc086 100644
--- a/beacon_node/lighthouse_network/src/rpc/handler.rs
+++ b/beacon_node/lighthouse_network/src/rpc/handler.rs
@@ -3,21 +3,19 @@
 
 use super::methods::{GoodbyeReason, RPCCodedResponse, RPCResponseErrorCode, ResponseTermination};
 use super::outbound::OutboundRequestContainer;
-use super::protocol::{max_rpc_size, InboundRequest, Protocol, RPCError, RPCProtocol};
+use super::protocol::{InboundOutput, InboundRequest, Protocol, RPCError, RPCProtocol};
 use super::{RPCReceived, RPCSend, ReqId};
 use crate::rpc::outbound::{OutboundFramed, OutboundRequest};
 use crate::rpc::protocol::InboundFramed;
 use fnv::FnvHashMap;
 use futures::prelude::*;
 use futures::{Sink, SinkExt};
-use libp2p::core::upgrade::{
-    InboundUpgrade, NegotiationError, OutboundUpgrade, ProtocolError, UpgradeError,
-};
 use libp2p::swarm::handler::{
-    ConnectionHandler, ConnectionHandlerEvent, ConnectionHandlerUpgrErr, KeepAlive,
+    ConnectionEvent, ConnectionHandler, ConnectionHandlerEvent, DialUpgradeError,
+    FullyNegotiatedInbound, FullyNegotiatedOutbound, KeepAlive, StreamUpgradeError,
     SubstreamProtocol,
 };
-use libp2p::swarm::NegotiatedSubstream;
+use libp2p::swarm::Stream;
 use slog::{crit, debug, trace, warn};
 use smallvec::SmallVec;
 use std::{
@@ -31,9 +29,6 @@ use tokio::time::{sleep_until, Instant as TInstant, Sleep};
 use tokio_util::time::{delay_queue, DelayQueue};
 use types::{EthSpec, ForkContext};
 
-/// The time (in seconds) before a substream that is awaiting a response from the user times out.
-pub const RESPONSE_TIMEOUT: u64 = 10;
-
 /// The number of times to retry an outbound upgrade in the case of IO errors.
 const IO_ERROR_RETRIES: u8 = 3;
 
@@ -47,7 +42,7 @@ const MAX_INBOUND_SUBSTREAMS: usize = 32;
 #[derive(Debug, Clone, Copy, Hash, Eq, PartialEq)]
 pub struct SubstreamId(usize);
 
-type InboundSubstream<TSpec> = InboundFramed<NegotiatedSubstream, TSpec>;
+type InboundSubstream<TSpec> = InboundFramed<Stream, TSpec>;
 
 /// Events the handler emits to the behaviour.
 pub type HandlerEvent<Id, T> = Result<RPCReceived<Id, T>, HandlerErr<Id>>;
@@ -131,6 +126,9 @@ where
 
     /// Logger for handling RPC streams
     log: slog::Logger,
+
+    /// Timeout that will me used for inbound and outbound responses.
+    resp_timeout: Duration,
 }
 
 enum HandlerState {
@@ -195,12 +193,12 @@ pub enum OutboundSubstreamState<TSpec: EthSpec> {
     /// handler because GOODBYE requests can be handled and responses dropped instantly.
     RequestPendingResponse {
         /// The framed negotiated substream.
-        substream: Box<OutboundFramed<NegotiatedSubstream, TSpec>>,
+        substream: Box<OutboundFramed<Stream, TSpec>>,
         /// Keeps track of the actual request sent.
         request: OutboundRequest<TSpec>,
     },
     /// Closing an outbound substream>
-    Closing(Box<OutboundFramed<NegotiatedSubstream, TSpec>>),
+    Closing(Box<OutboundFramed<Stream, TSpec>>),
     /// Temporary state during processing
     Poisoned,
 }
@@ -213,6 +211,7 @@ where
         listen_protocol: SubstreamProtocol<RPCProtocol<TSpec>, ()>,
         fork_context: Arc<ForkContext>,
         log: &slog::Logger,
+        resp_timeout: Duration,
     ) -> Self {
         RPCHandler {
             listen_protocol,
@@ -231,6 +230,7 @@ where
             fork_context,
             waker: None,
             log: log.clone(),
+            resp_timeout,
         }
     }
 
@@ -315,8 +315,8 @@ where
     TSpec: EthSpec,
     Id: ReqId,
 {
-    type InEvent = RPCSend<Id, TSpec>;
-    type OutEvent = HandlerEvent<Id, TSpec>;
+    type FromBehaviour = RPCSend<Id, TSpec>;
+    type ToBehaviour = HandlerEvent<Id, TSpec>;
     type Error = RPCError;
     type InboundProtocol = RPCProtocol<TSpec>;
     type OutboundProtocol = OutboundRequestContainer<TSpec>;
@@ -327,121 +327,7 @@ where
         self.listen_protocol.clone()
     }
 
-    fn inject_fully_negotiated_outbound(
-        &mut self,
-        out: <Self::OutboundProtocol as OutboundUpgrade<NegotiatedSubstream>>::Output,
-        request_info: Self::OutboundOpenInfo,
-    ) {
-        self.dial_negotiated -= 1;
-        let (id, request) = request_info;
-        let proto = request.versioned_protocol().protocol();
-
-        // accept outbound connections only if the handler is not deactivated
-        if matches!(self.state, HandlerState::Deactivated) {
-            self.events_out.push(Err(HandlerErr::Outbound {
-                error: RPCError::Disconnected,
-                proto,
-                id,
-            }));
-        }
-
-        // add the stream to substreams if we expect a response, otherwise drop the stream.
-        let expected_responses = request.expected_responses();
-        if expected_responses > 0 {
-            // new outbound request. Store the stream and tag the output.
-            let delay_key = self.outbound_substreams_delay.insert(
-                self.current_outbound_substream_id,
-                Duration::from_secs(RESPONSE_TIMEOUT),
-            );
-            let awaiting_stream = OutboundSubstreamState::RequestPendingResponse {
-                substream: Box::new(out),
-                request,
-            };
-            let expected_responses = if expected_responses > 1 {
-                // Currently enforced only for multiple responses
-                Some(expected_responses)
-            } else {
-                None
-            };
-            if self
-                .outbound_substreams
-                .insert(
-                    self.current_outbound_substream_id,
-                    OutboundInfo {
-                        state: awaiting_stream,
-                        delay_key,
-                        proto,
-                        remaining_chunks: expected_responses,
-                        req_id: id,
-                    },
-                )
-                .is_some()
-            {
-                crit!(self.log, "Duplicate outbound substream id"; "id" => self.current_outbound_substream_id);
-            }
-            self.current_outbound_substream_id.0 += 1;
-        }
-    }
-
-    fn inject_fully_negotiated_inbound(
-        &mut self,
-        substream: <Self::InboundProtocol as InboundUpgrade<NegotiatedSubstream>>::Output,
-        _info: Self::InboundOpenInfo,
-    ) {
-        // only accept new peer requests when active
-        if !matches!(self.state, HandlerState::Active) {
-            return;
-        }
-
-        let (req, substream) = substream;
-        let expected_responses = req.expected_responses();
-
-        // store requests that expect responses
-        if expected_responses > 0 {
-            if self.inbound_substreams.len() < MAX_INBOUND_SUBSTREAMS {
-                // Store the stream and tag the output.
-                let delay_key = self.inbound_substreams_delay.insert(
-                    self.current_inbound_substream_id,
-                    Duration::from_secs(RESPONSE_TIMEOUT),
-                );
-                let awaiting_stream = InboundState::Idle(substream);
-                self.inbound_substreams.insert(
-                    self.current_inbound_substream_id,
-                    InboundInfo {
-                        state: awaiting_stream,
-                        pending_items: VecDeque::with_capacity(std::cmp::min(
-                            expected_responses,
-                            128,
-                        ) as usize),
-                        delay_key: Some(delay_key),
-                        protocol: req.versioned_protocol().protocol(),
-                        request_start_time: Instant::now(),
-                        remaining_chunks: expected_responses,
-                    },
-                );
-            } else {
-                self.events_out.push(Err(HandlerErr::Inbound {
-                    id: self.current_inbound_substream_id,
-                    proto: req.versioned_protocol().protocol(),
-                    error: RPCError::HandlerRejected,
-                }));
-                return self.shutdown(None);
-            }
-        }
-
-        // If we received a goodbye, shutdown the connection.
-        if let InboundRequest::Goodbye(_) = req {
-            self.shutdown(None);
-        }
-
-        self.events_out.push(Ok(RPCReceived::Request(
-            self.current_inbound_substream_id,
-            req,
-        )));
-        self.current_inbound_substream_id.0 += 1;
-    }
-
-    fn inject_event(&mut self, rpc_event: Self::InEvent) {
+    fn on_behaviour_event(&mut self, rpc_event: Self::FromBehaviour) {
         match rpc_event {
             RPCSend::Request(id, req) => self.send_request(id, req),
             RPCSend::Response(inbound_id, response) => self.send_response(inbound_id, response),
@@ -453,56 +339,6 @@ where
         }
     }
 
-    fn inject_dial_upgrade_error(
-        &mut self,
-        request_info: Self::OutboundOpenInfo,
-        error: ConnectionHandlerUpgrErr<
-            <Self::OutboundProtocol as OutboundUpgrade<NegotiatedSubstream>>::Error,
-        >,
-    ) {
-        let (id, req) = request_info;
-        if let ConnectionHandlerUpgrErr::Upgrade(UpgradeError::Apply(RPCError::IoError(_))) = error
-        {
-            self.outbound_io_error_retries += 1;
-            if self.outbound_io_error_retries < IO_ERROR_RETRIES {
-                self.send_request(id, req);
-                return;
-            }
-        }
-
-        // This dialing is now considered failed
-        self.dial_negotiated -= 1;
-
-        self.outbound_io_error_retries = 0;
-        // map the error
-        let error = match error {
-            ConnectionHandlerUpgrErr::Timer => RPCError::InternalError("Timer failed"),
-            ConnectionHandlerUpgrErr::Timeout => RPCError::NegotiationTimeout,
-            ConnectionHandlerUpgrErr::Upgrade(UpgradeError::Apply(e)) => e,
-            ConnectionHandlerUpgrErr::Upgrade(UpgradeError::Select(NegotiationError::Failed)) => {
-                RPCError::UnsupportedProtocol
-            }
-            ConnectionHandlerUpgrErr::Upgrade(UpgradeError::Select(
-                NegotiationError::ProtocolError(e),
-            )) => match e {
-                ProtocolError::IoError(io_err) => RPCError::IoError(io_err.to_string()),
-                ProtocolError::InvalidProtocol => {
-                    RPCError::InternalError("Protocol was deemed invalid")
-                }
-                ProtocolError::InvalidMessage | ProtocolError::TooManyProtocols => {
-                    // Peer is sending invalid data during the negotiation phase, not
-                    // participating in the protocol
-                    RPCError::InvalidData("Invalid message during negotiation".to_string())
-                }
-            },
-        };
-        self.events_out.push(Err(HandlerErr::Outbound {
-            error,
-            proto: req.versioned_protocol().protocol(),
-            id,
-        }));
-    }
-
     fn connection_keep_alive(&self) -> KeepAlive {
         // Check that we don't have outbound items pending for dialing, nor dialing, nor
         // established. Also check that there are no established inbound substreams.
@@ -535,7 +371,7 @@ where
         ConnectionHandlerEvent<
             Self::OutboundProtocol,
             Self::OutboundOpenInfo,
-            Self::OutEvent,
+            Self::ToBehaviour,
             Self::Error,
         >,
     > {
@@ -548,7 +384,9 @@ where
         }
         // return any events that need to be reported
         if !self.events_out.is_empty() {
-            return Poll::Ready(ConnectionHandlerEvent::Custom(self.events_out.remove(0)));
+            return Poll::Ready(ConnectionHandlerEvent::NotifyBehaviour(
+                self.events_out.remove(0),
+            ));
         } else {
             self.events_out.shrink_to_fit();
         }
@@ -612,7 +450,9 @@ where
                             error: RPCError::StreamTimeout,
                         };
                         // notify the user
-                        return Poll::Ready(ConnectionHandlerEvent::Custom(Err(outbound_err)));
+                        return Poll::Ready(ConnectionHandlerEvent::NotifyBehaviour(Err(
+                            outbound_err,
+                        )));
                     } else {
                         crit!(self.log, "timed out substream not in the books"; "stream_id" => outbound_id.get_ref());
                     }
@@ -714,7 +554,7 @@ where
                                 // Each chunk is allowed RESPONSE_TIMEOUT to be sent.
                                 if let Some(ref delay_key) = info.delay_key {
                                     self.inbound_substreams_delay
-                                        .reset(delay_key, Duration::from_secs(RESPONSE_TIMEOUT));
+                                        .reset(delay_key, self.resp_timeout);
                                 }
 
                                 // The stream may be currently idle. Attempt to process more
@@ -848,7 +688,7 @@ where
                                     };
                                 substream_entry.remaining_chunks = Some(remaining_chunks);
                                 self.outbound_substreams_delay
-                                    .reset(delay_key, Duration::from_secs(RESPONSE_TIMEOUT));
+                                    .reset(delay_key, self.resp_timeout);
                             }
                         } else {
                             // either this is a single response request or this response closes the
@@ -872,7 +712,7 @@ where
                             }),
                         };
 
-                        return Poll::Ready(ConnectionHandlerEvent::Custom(received));
+                        return Poll::Ready(ConnectionHandlerEvent::NotifyBehaviour(received));
                     }
                     Poll::Ready(None) => {
                         // stream closed
@@ -887,7 +727,7 @@ where
                         // notify the application error
                         if request.expected_responses() > 1 {
                             // return an end of stream result
-                            return Poll::Ready(ConnectionHandlerEvent::Custom(Ok(
+                            return Poll::Ready(ConnectionHandlerEvent::NotifyBehaviour(Ok(
                                 RPCReceived::EndOfStream(request_id, request.stream_termination()),
                             )));
                         }
@@ -898,7 +738,9 @@ where
                             proto: request.versioned_protocol().protocol(),
                             error: RPCError::IncompleteStream,
                         };
-                        return Poll::Ready(ConnectionHandlerEvent::Custom(Err(outbound_err)));
+                        return Poll::Ready(ConnectionHandlerEvent::NotifyBehaviour(Err(
+                            outbound_err,
+                        )));
                     }
                     Poll::Pending => {
                         entry.get_mut().state =
@@ -914,7 +756,9 @@ where
                             error: e,
                         };
                         entry.remove_entry();
-                        return Poll::Ready(ConnectionHandlerEvent::Custom(Err(outbound_err)));
+                        return Poll::Ready(ConnectionHandlerEvent::NotifyBehaviour(Err(
+                            outbound_err,
+                        )));
                     }
                 },
                 OutboundSubstreamState::Closing(mut substream) => {
@@ -940,7 +784,7 @@ where
                             };
 
                             if let Some(termination) = termination {
-                                return Poll::Ready(ConnectionHandlerEvent::Custom(Ok(
+                                return Poll::Ready(ConnectionHandlerEvent::NotifyBehaviour(Ok(
                                     RPCReceived::EndOfStream(request_id, termination),
                                 )));
                             }
@@ -967,7 +811,7 @@ where
                     OutboundRequestContainer {
                         req: req.clone(),
                         fork_context: self.fork_context.clone(),
-                        max_rpc_size: max_rpc_size(&self.fork_context),
+                        max_rpc_size: self.listen_protocol().upgrade().max_rpc_size,
                     },
                     (),
                 )
@@ -989,6 +833,205 @@ where
 
         Poll::Pending
     }
+
+    fn on_connection_event(
+        &mut self,
+        event: ConnectionEvent<
+            Self::InboundProtocol,
+            Self::OutboundProtocol,
+            Self::InboundOpenInfo,
+            Self::OutboundOpenInfo,
+        >,
+    ) {
+        match event {
+            ConnectionEvent::FullyNegotiatedInbound(FullyNegotiatedInbound {
+                protocol,
+                info: _,
+            }) => self.on_fully_negotiated_inbound(protocol),
+            ConnectionEvent::FullyNegotiatedOutbound(FullyNegotiatedOutbound {
+                protocol,
+                info,
+            }) => self.on_fully_negotiated_outbound(protocol, info),
+            ConnectionEvent::DialUpgradeError(DialUpgradeError { info, error }) => {
+                self.on_dial_upgrade_error(info, error)
+            }
+            ConnectionEvent::ListenUpgradeError(libp2p::swarm::handler::ListenUpgradeError {
+                info: _,
+                error: _, /* RPCError */
+            }) => {
+                // This is going to be removed in the next libp2p release. I think its fine to do
+                // nothing.
+            }
+            ConnectionEvent::LocalProtocolsChange(_) => {
+                // This shouldn't effect this handler, we will still negotiate streams if we support
+                // the protocol as usual.
+            }
+            ConnectionEvent::RemoteProtocolsChange(_) => {
+                // This shouldn't effect this handler, we will still negotiate streams if we support
+                // the protocol as usual.
+            }
+            ConnectionEvent::AddressChange(_) => {
+                // We dont care about these changes as they have no bearing on our RPC internal
+                // logic.
+            }
+        }
+    }
+}
+
+impl<Id, TSpec: EthSpec> RPCHandler<Id, TSpec>
+where
+    Id: ReqId,
+    TSpec: EthSpec,
+{
+    fn on_fully_negotiated_inbound(&mut self, substream: InboundOutput<Stream, TSpec>) {
+        // only accept new peer requests when active
+        if !matches!(self.state, HandlerState::Active) {
+            return;
+        }
+
+        let (req, substream) = substream;
+        let expected_responses = req.expected_responses();
+
+        // store requests that expect responses
+        if expected_responses > 0 {
+            if self.inbound_substreams.len() < MAX_INBOUND_SUBSTREAMS {
+                // Store the stream and tag the output.
+                let delay_key = self
+                    .inbound_substreams_delay
+                    .insert(self.current_inbound_substream_id, self.resp_timeout);
+                let awaiting_stream = InboundState::Idle(substream);
+                self.inbound_substreams.insert(
+                    self.current_inbound_substream_id,
+                    InboundInfo {
+                        state: awaiting_stream,
+                        pending_items: VecDeque::with_capacity(std::cmp::min(
+                            expected_responses,
+                            128,
+                        ) as usize),
+                        delay_key: Some(delay_key),
+                        protocol: req.versioned_protocol().protocol(),
+                        request_start_time: Instant::now(),
+                        remaining_chunks: expected_responses,
+                    },
+                );
+            } else {
+                self.events_out.push(Err(HandlerErr::Inbound {
+                    id: self.current_inbound_substream_id,
+                    proto: req.versioned_protocol().protocol(),
+                    error: RPCError::HandlerRejected,
+                }));
+                return self.shutdown(None);
+            }
+        }
+
+        // If we received a goodbye, shutdown the connection.
+        if let InboundRequest::Goodbye(_) = req {
+            self.shutdown(None);
+        }
+
+        self.events_out.push(Ok(RPCReceived::Request(
+            self.current_inbound_substream_id,
+            req,
+        )));
+        self.current_inbound_substream_id.0 += 1;
+    }
+
+    fn on_fully_negotiated_outbound(
+        &mut self,
+        substream: OutboundFramed<Stream, TSpec>,
+        (id, request): (Id, OutboundRequest<TSpec>),
+    ) {
+        self.dial_negotiated -= 1;
+        // Reset any io-retries counter.
+        self.outbound_io_error_retries = 0;
+
+        let proto = request.versioned_protocol().protocol();
+
+        // accept outbound connections only if the handler is not deactivated
+        if matches!(self.state, HandlerState::Deactivated) {
+            self.events_out.push(Err(HandlerErr::Outbound {
+                error: RPCError::Disconnected,
+                proto,
+                id,
+            }));
+        }
+
+        // add the stream to substreams if we expect a response, otherwise drop the stream.
+        let expected_responses = request.expected_responses();
+        if expected_responses > 0 {
+            // new outbound request. Store the stream and tag the output.
+            let delay_key = self
+                .outbound_substreams_delay
+                .insert(self.current_outbound_substream_id, self.resp_timeout);
+            let awaiting_stream = OutboundSubstreamState::RequestPendingResponse {
+                substream: Box::new(substream),
+                request,
+            };
+            let expected_responses = if expected_responses > 1 {
+                // Currently enforced only for multiple responses
+                Some(expected_responses)
+            } else {
+                None
+            };
+            if self
+                .outbound_substreams
+                .insert(
+                    self.current_outbound_substream_id,
+                    OutboundInfo {
+                        state: awaiting_stream,
+                        delay_key,
+                        proto,
+                        remaining_chunks: expected_responses,
+                        req_id: id,
+                    },
+                )
+                .is_some()
+            {
+                crit!(self.log, "Duplicate outbound substream id"; "id" => self.current_outbound_substream_id);
+            }
+            self.current_outbound_substream_id.0 += 1;
+        }
+    }
+    fn on_dial_upgrade_error(
+        &mut self,
+        request_info: (Id, OutboundRequest<TSpec>),
+        error: StreamUpgradeError<RPCError>,
+    ) {
+        let (id, req) = request_info;
+
+        // map the error
+        let error = match error {
+            StreamUpgradeError::Timeout => RPCError::NegotiationTimeout,
+            StreamUpgradeError::Apply(RPCError::IoError(e)) => {
+                self.outbound_io_error_retries += 1;
+                if self.outbound_io_error_retries < IO_ERROR_RETRIES {
+                    self.send_request(id, req);
+                    return;
+                }
+                RPCError::IoError(e)
+            }
+            StreamUpgradeError::NegotiationFailed => RPCError::UnsupportedProtocol,
+            StreamUpgradeError::Io(io_err) => {
+                self.outbound_io_error_retries += 1;
+                if self.outbound_io_error_retries < IO_ERROR_RETRIES {
+                    self.send_request(id, req);
+                    return;
+                }
+                RPCError::IoError(io_err.to_string())
+            }
+            StreamUpgradeError::Apply(other) => other,
+        };
+
+        // This dialing is now considered failed
+        self.dial_negotiated -= 1;
+
+        self.outbound_io_error_retries = 0;
+        self.events_out.push(Err(HandlerErr::Outbound {
+            error,
+            proto: req.versioned_protocol().protocol(),
+            id,
+        }));
+    }
 }
 
 impl slog::Value for SubstreamId {
diff --git a/beacon_node/lighthouse_network/src/rpc/mod.rs b/beacon_node/lighthouse_network/src/rpc/mod.rs
index ffdc193bbb..14f77e4ba2 100644
--- a/beacon_node/lighthouse_network/src/rpc/mod.rs
+++ b/beacon_node/lighthouse_network/src/rpc/mod.rs
@@ -6,22 +6,23 @@
 
 use futures::future::FutureExt;
 use handler::{HandlerEvent, RPCHandler};
-use libp2p::core::connection::ConnectionId;
 use libp2p::swarm::{
-    handler::ConnectionHandler, NetworkBehaviour, NetworkBehaviourAction, NotifyHandler,
-    PollParameters, SubstreamProtocol,
+    handler::ConnectionHandler, ConnectionId, NetworkBehaviour, NotifyHandler, PollParameters,
+    ToSwarm,
 };
+use libp2p::swarm::{FromSwarm, SubstreamProtocol, THandlerInEvent};
 use libp2p::PeerId;
 use rate_limiter::{RPCRateLimiter as RateLimiter, RateLimitedErr};
 use slog::{crit, debug, o};
 use std::marker::PhantomData;
 use std::sync::Arc;
 use std::task::{Context, Poll};
+use std::time::Duration;
 use types::{EthSpec, ForkContext};
 
 pub(crate) use handler::HandlerErr;
 pub(crate) use methods::{MetaData, MetaDataV1, MetaDataV2, Ping, RPCCodedResponse, RPCResponse};
-pub(crate) use protocol::{InboundRequest, RPCProtocol};
+pub(crate) use protocol::InboundRequest;
 
 pub use handler::SubstreamId;
 pub use methods::{
@@ -32,6 +33,7 @@ pub(crate) use outbound::OutboundRequest;
 pub use protocol::{max_rpc_size, Protocol, RPCError};
 
 use self::config::{InboundRateLimiterConfig, OutboundRateLimiterConfig};
+use self::protocol::RPCProtocol;
 use self::self_limiter::SelfRateLimiter;
 
 pub(crate) mod codec;
@@ -104,8 +106,13 @@ pub struct RPCMessage<Id, TSpec: EthSpec> {
     pub event: HandlerEvent<Id, TSpec>,
 }
 
-type BehaviourAction<Id, TSpec> =
-    NetworkBehaviourAction<RPCMessage<Id, TSpec>, RPCHandler<Id, TSpec>>;
+type BehaviourAction<Id, TSpec> = ToSwarm<RPCMessage<Id, TSpec>, RPCSend<Id, TSpec>>;
+
+pub struct NetworkParams {
+    pub max_chunk_size: usize,
+    pub ttfb_timeout: Duration,
+    pub resp_timeout: Duration,
+}
 
 /// Implements the libp2p `NetworkBehaviour` trait and therefore manages network-level
 /// logic.
@@ -120,6 +127,8 @@ pub struct RPC<Id: ReqId, TSpec: EthSpec> {
     enable_light_client_server: bool,
     /// Slog logger for RPC behaviour.
     log: slog::Logger,
+    /// Networking constant values
+    network_params: NetworkParams,
 }
 
 impl<Id: ReqId, TSpec: EthSpec> RPC<Id, TSpec> {
@@ -129,6 +138,7 @@ impl<Id: ReqId, TSpec: EthSpec> RPC<Id, TSpec> {
         inbound_rate_limiter_config: Option<InboundRateLimiterConfig>,
         outbound_rate_limiter_config: Option<OutboundRateLimiterConfig>,
         log: slog::Logger,
+        network_params: NetworkParams,
     ) -> Self {
         let log = log.new(o!("service" => "libp2p_rpc"));
 
@@ -149,6 +159,7 @@ impl<Id: ReqId, TSpec: EthSpec> RPC<Id, TSpec> {
             fork_context,
             enable_light_client_server,
             log,
+            network_params,
         }
     }
 
@@ -161,7 +172,7 @@ impl<Id: ReqId, TSpec: EthSpec> RPC<Id, TSpec> {
         id: (ConnectionId, SubstreamId),
         event: RPCCodedResponse<TSpec>,
     ) {
-        self.events.push(NetworkBehaviourAction::NotifyHandler {
+        self.events.push(ToSwarm::NotifyHandler {
             peer_id,
             handler: NotifyHandler::One(id.0),
             event: RPCSend::Response(id.1, event),
@@ -181,7 +192,7 @@ impl<Id: ReqId, TSpec: EthSpec> RPC<Id, TSpec> {
                 }
             }
         } else {
-            NetworkBehaviourAction::NotifyHandler {
+            ToSwarm::NotifyHandler {
                 peer_id,
                 handler: NotifyHandler::Any,
                 event: RPCSend::Request(request_id, req),
@@ -194,7 +205,7 @@ impl<Id: ReqId, TSpec: EthSpec> RPC<Id, TSpec> {
     /// Lighthouse wishes to disconnect from this peer by sending a Goodbye message. This
     /// gracefully terminates the RPC behaviour with a goodbye message.
     pub fn shutdown(&mut self, peer_id: PeerId, id: Id, reason: GoodbyeReason) {
-        self.events.push(NetworkBehaviourAction::NotifyHandler {
+        self.events.push(ToSwarm::NotifyHandler {
             peer_id,
             handler: NotifyHandler::Any,
             event: RPCSend::Shutdown(id, reason),
@@ -208,29 +219,95 @@ where
     Id: ReqId,
 {
     type ConnectionHandler = RPCHandler<Id, TSpec>;
-    type OutEvent = RPCMessage<Id, TSpec>;
+    type ToSwarm = RPCMessage<Id, TSpec>;
 
-    fn new_handler(&mut self) -> Self::ConnectionHandler {
-        RPCHandler::new(
-            SubstreamProtocol::new(
-                RPCProtocol {
-                    fork_context: self.fork_context.clone(),
-                    max_rpc_size: max_rpc_size(&self.fork_context),
-                    enable_light_client_server: self.enable_light_client_server,
-                    phantom: PhantomData,
-                },
-                (),
-            ),
+    fn handle_established_inbound_connection(
+        &mut self,
+        _connection_id: ConnectionId,
+        peer_id: PeerId,
+        _local_addr: &libp2p::Multiaddr,
+        _remote_addr: &libp2p::Multiaddr,
+    ) -> Result<libp2p::swarm::THandler<Self>, libp2p::swarm::ConnectionDenied> {
+        let protocol = SubstreamProtocol::new(
+            RPCProtocol {
+                fork_context: self.fork_context.clone(),
+                max_rpc_size: max_rpc_size(&self.fork_context, self.network_params.max_chunk_size),
+                enable_light_client_server: self.enable_light_client_server,
+                phantom: PhantomData,
+                ttfb_timeout: self.network_params.ttfb_timeout,
+            },
+            (),
+        );
+        // NOTE: this is needed because PeerIds have interior mutability.
+        let peer_repr = peer_id.to_string();
+        let log = self.log.new(slog::o!("peer_id" => peer_repr));
+        let handler = RPCHandler::new(
+            protocol,
             self.fork_context.clone(),
-            &self.log,
-        )
+            &log,
+            self.network_params.resp_timeout,
+        );
+
+        Ok(handler)
     }
 
-    fn inject_event(
+    fn handle_established_outbound_connection(
+        &mut self,
+        _connection_id: ConnectionId,
+        peer_id: PeerId,
+        _addr: &libp2p::Multiaddr,
+        _role_override: libp2p::core::Endpoint,
+    ) -> Result<libp2p::swarm::THandler<Self>, libp2p::swarm::ConnectionDenied> {
+        let protocol = SubstreamProtocol::new(
+            RPCProtocol {
+                fork_context: self.fork_context.clone(),
+                max_rpc_size: max_rpc_size(&self.fork_context, self.network_params.max_chunk_size),
+                enable_light_client_server: self.enable_light_client_server,
+                phantom: PhantomData,
+                ttfb_timeout: self.network_params.ttfb_timeout,
+            },
+            (),
+        );
+
+        // NOTE: this is needed because PeerIds have interior mutability.
+        let peer_repr = peer_id.to_string();
+        let log = self.log.new(slog::o!("peer_id" => peer_repr));
+        let handler = RPCHandler::new(
+            protocol,
+            self.fork_context.clone(),
+            &log,
+            self.network_params.resp_timeout,
+        );
+
+        Ok(handler)
+    }
+
+    fn on_swarm_event(&mut self, event: FromSwarm<Self::ConnectionHandler>) {
+        match event {
+            FromSwarm::ConnectionClosed(_)
+            | FromSwarm::ConnectionEstablished(_)
+            | FromSwarm::AddressChange(_)
+            | FromSwarm::DialFailure(_)
+            | FromSwarm::ListenFailure(_)
+            | FromSwarm::NewListener(_)
+            | FromSwarm::NewListenAddr(_)
+            | FromSwarm::ExpiredListenAddr(_)
+            | FromSwarm::ListenerError(_)
+            | FromSwarm::ListenerClosed(_)
+            | FromSwarm::NewExternalAddrCandidate(_)
+            | FromSwarm::ExternalAddrExpired(_)
+            | FromSwarm::ExternalAddrConfirmed(_) => {
+                // Rpc Behaviour does not act on these swarm events. We use a comprehensive match
+                // statement to ensure future events are dealt with appropriately.
+            }
+        }
+    }
+
+    fn on_connection_handler_event(
         &mut self,
         peer_id: PeerId,
         conn_id: ConnectionId,
-        event: <Self::ConnectionHandler as ConnectionHandler>::OutEvent,
+        event: <Self::ConnectionHandler as ConnectionHandler>::ToBehaviour,
     ) {
         if let Ok(RPCReceived::Request(ref id, ref req)) = event {
             if let Some(limiter) = self.limiter.as_mut() {
@@ -238,12 +315,11 @@ where
                 match limiter.allows(&peer_id, req) {
                     Ok(()) => {
                         // send the event to the user
-                        self.events
-                            .push(NetworkBehaviourAction::GenerateEvent(RPCMessage {
-                                peer_id,
-                                conn_id,
-                                event,
-                            }))
+                        self.events.push(ToSwarm::GenerateEvent(RPCMessage {
+                            peer_id,
+                            conn_id,
+                            event,
+                        }))
                     }
                     Err(RateLimitedErr::TooLarge) => {
                         // we set the batch sizes, so this is a coding/config err for most protocols
@@ -281,20 +357,18 @@ where
                 }
             } else {
                 // No rate limiting, send the event to the user
-                self.events
-                    .push(NetworkBehaviourAction::GenerateEvent(RPCMessage {
-                        peer_id,
-                        conn_id,
-                        event,
-                    }))
-            }
-        } else {
-            self.events
-                .push(NetworkBehaviourAction::GenerateEvent(RPCMessage {
+                self.events.push(ToSwarm::GenerateEvent(RPCMessage {
                     peer_id,
                     conn_id,
                     event,
-                }));
+                }))
+            }
+        } else {
+            self.events.push(ToSwarm::GenerateEvent(RPCMessage {
+                peer_id,
+                conn_id,
+                event,
+            }));
         }
     }
 
@@ -302,7 +376,7 @@ where
         &mut self,
         cx: &mut Context,
         _: &mut impl PollParameters,
-    ) -> Poll<NetworkBehaviourAction<Self::OutEvent, Self::ConnectionHandler>> {
+    ) -> Poll<ToSwarm<Self::ToSwarm, THandlerInEvent<Self>>> {
         // let the rate limiter prune.
         if let Some(limiter) = self.limiter.as_mut() {
             let _ = limiter.poll_unpin(cx);
diff --git a/beacon_node/lighthouse_network/src/rpc/protocol.rs b/beacon_node/lighthouse_network/src/rpc/protocol.rs
index ea39c1423a..f2a39470b9 100644
--- a/beacon_node/lighthouse_network/src/rpc/protocol.rs
+++ b/beacon_node/lighthouse_network/src/rpc/protocol.rs
@@ -7,7 +7,7 @@ use crate::rpc::{
 use futures::future::BoxFuture;
 use futures::prelude::{AsyncRead, AsyncWrite};
 use futures::{FutureExt, StreamExt};
-use libp2p::core::{InboundUpgrade, ProtocolName, UpgradeInfo};
+use libp2p::core::{InboundUpgrade, UpgradeInfo};
 use ssz::Encode;
 use ssz_types::VariableList;
 use std::io;
@@ -72,7 +72,7 @@ lazy_static! {
     /// The `BeaconBlockMerge` block has an `ExecutionPayload` field which has a max size ~16 GiB for future proofing.
     /// We calculate the value from its fields instead of constructing the block and checking the length.
     /// Note: This is only the theoretical upper bound. We further bound the max size we receive over the network
-    /// with `MAX_RPC_SIZE_POST_MERGE`.
+    /// with `max_chunk_size`.
     pub static ref SIGNED_BEACON_BLOCK_MERGE_MAX: usize =
     // Size of a full altair block
     *SIGNED_BEACON_BLOCK_ALTAIR_MAX
@@ -109,25 +109,18 @@ lazy_static! {
     .len();
 }
 
-/// The maximum bytes that can be sent across the RPC pre-merge.
-pub(crate) const MAX_RPC_SIZE: usize = 1_048_576; // 1M
-/// The maximum bytes that can be sent across the RPC post-merge.
-pub(crate) const MAX_RPC_SIZE_POST_MERGE: usize = 10 * 1_048_576; // 10M
-pub(crate) const MAX_RPC_SIZE_POST_CAPELLA: usize = 10 * 1_048_576; // 10M
 /// The protocol prefix the RPC protocol id.
 const PROTOCOL_PREFIX: &str = "/eth2/beacon_chain/req";
-/// Time allowed for the first byte of a request to arrive before we time out (Time To First Byte).
-const TTFB_TIMEOUT: u64 = 5;
 /// The number of seconds to wait for the first bytes of a request once a protocol has been
 /// established before the stream is terminated.
 const REQUEST_TIMEOUT: u64 = 15;
 
 /// Returns the maximum bytes that can be sent across the RPC.
-pub fn max_rpc_size(fork_context: &ForkContext) -> usize {
+pub fn max_rpc_size(fork_context: &ForkContext, max_chunk_size: usize) -> usize {
     match fork_context.current_fork() {
-        ForkName::Altair | ForkName::Base => MAX_RPC_SIZE,
-        ForkName::Merge => MAX_RPC_SIZE_POST_MERGE,
-        ForkName::Capella => MAX_RPC_SIZE_POST_CAPELLA,
+        ForkName::Altair | ForkName::Base => max_chunk_size / 10,
+        ForkName::Merge => max_chunk_size,
+        ForkName::Capella => max_chunk_size,
     }
 }
 
@@ -262,6 +255,7 @@ pub struct RPCProtocol<TSpec: EthSpec> {
     pub max_rpc_size: usize,
     pub enable_light_client_server: bool,
     pub phantom: PhantomData<TSpec>,
+    pub ttfb_timeout: Duration,
 }
 
 impl<TSpec: EthSpec> UpgradeInfo for RPCProtocol<TSpec> {
@@ -313,6 +307,12 @@ pub struct ProtocolId {
     protocol_id: String,
 }
 
+impl AsRef<str> for ProtocolId {
+    fn as_ref(&self) -> &str {
+        self.protocol_id.as_ref()
+    }
+}
+
 impl ProtocolId {
     /// Returns min and max size for messages of given protocol id requests.
     pub fn rpc_request_limits(&self) -> RpcLimits {
@@ -407,12 +407,6 @@ impl ProtocolId {
     }
 }
 
-impl ProtocolName for ProtocolId {
-    fn protocol_name(&self) -> &[u8] {
-        self.protocol_id.as_bytes()
-    }
-}
-
 /* Inbound upgrade */
 
 // The inbound protocol reads the request, decodes it and returns the stream to the protocol
@@ -447,7 +441,7 @@ where
                 }
             };
             let mut timed_socket = TimeoutStream::new(socket);
-            timed_socket.set_read_timeout(Some(Duration::from_secs(TTFB_TIMEOUT)));
+            timed_socket.set_read_timeout(Some(self.ttfb_timeout));
 
             let socket = Framed::new(Box::pin(timed_socket), codec);
 
diff --git a/beacon_node/lighthouse_network/src/rpc/self_limiter.rs b/beacon_node/lighthouse_network/src/rpc/self_limiter.rs
index 626917d6a7..4348c1ec6d 100644
--- a/beacon_node/lighthouse_network/src/rpc/self_limiter.rs
+++ b/beacon_node/lighthouse_network/src/rpc/self_limiter.rs
@@ -64,7 +64,7 @@ impl<Id: ReqId, TSpec: EthSpec> SelfRateLimiter<Id, TSpec> {
     }
 
     /// Checks if the rate limiter allows the request. If it's allowed, returns the
-    /// [`NetworkBehaviourAction`] that should be emitted. When not allowed, the request is delayed
+    /// [`ToSwarm`] that should be emitted. When not allowed, the request is delayed
     /// until it can be sent.
     pub fn allows(
         &mut self,
@@ -95,7 +95,7 @@ impl<Id: ReqId, TSpec: EthSpec> SelfRateLimiter<Id, TSpec> {
     }
 
     /// Auxiliary function to deal with self rate limiting outcomes. If the rate limiter allows the
-    /// request, the [`NetworkBehaviourAction`] that should be emitted is returned. If the request
+    /// request, the [`ToSwarm`] that should be emitted is returned. If the request
     /// should be delayed, it's returned with the duration to wait.
     fn try_send_request(
         limiter: &mut RateLimiter,
diff --git a/beacon_node/lighthouse_network/src/service/api_types.rs b/beacon_node/lighthouse_network/src/service/api_types.rs
index 5ab89fee51..187c0ab1b1 100644
--- a/beacon_node/lighthouse_network/src/service/api_types.rs
+++ b/beacon_node/lighthouse_network/src/service/api_types.rs
@@ -1,6 +1,6 @@
 use std::sync::Arc;
 
-use libp2p::core::connection::ConnectionId;
+use libp2p::swarm::ConnectionId;
 use types::light_client_bootstrap::LightClientBootstrap;
 use types::{EthSpec, SignedBeaconBlock};
 
diff --git a/beacon_node/lighthouse_network/src/service/behaviour.rs b/beacon_node/lighthouse_network/src/service/behaviour.rs
index 7d20b87ad1..6c52a07c14 100644
--- a/beacon_node/lighthouse_network/src/service/behaviour.rs
+++ b/beacon_node/lighthouse_network/src/service/behaviour.rs
@@ -3,21 +3,27 @@ use crate::peer_manager::PeerManager;
 use crate::rpc::{ReqId, RPC};
 use crate::types::SnappyTransform;
 
-use libp2p::gossipsub::subscription_filter::{
-    MaxCountSubscriptionFilter, WhitelistSubscriptionFilter,
-};
-use libp2p::gossipsub::Gossipsub as BaseGossipsub;
-use libp2p::identify::Behaviour as Identify;
+use libp2p::gossipsub;
+use libp2p::identify;
 use libp2p::swarm::NetworkBehaviour;
 use types::EthSpec;
 
 use super::api_types::RequestId;
 
-pub type SubscriptionFilter = MaxCountSubscriptionFilter<WhitelistSubscriptionFilter>;
-pub type Gossipsub = BaseGossipsub<SnappyTransform, SubscriptionFilter>;
+pub type SubscriptionFilter =
+    gossipsub::MaxCountSubscriptionFilter<gossipsub::WhitelistSubscriptionFilter>;
+pub type Gossipsub = gossipsub::Behaviour<SnappyTransform, SubscriptionFilter>;
 
 #[derive(NetworkBehaviour)]
-pub(crate) struct Behaviour<AppReqId: ReqId, TSpec: EthSpec> {
+pub(crate) struct Behaviour<AppReqId, TSpec>
+where
+    AppReqId: ReqId,
+    TSpec: EthSpec,
+{
+    /// Peers banned.
+    pub banned_peers: libp2p::allow_block_list::Behaviour<libp2p::allow_block_list::BlockedPeers>,
+    /// Keep track of active and pending connections to enforce hard limits.
+    pub connection_limits: libp2p::connection_limits::Behaviour,
     /// The routing pub-sub mechanism for eth2.
     pub gossipsub: Gossipsub,
     /// The Eth2 RPC specified in the wire-0 protocol.
@@ -27,7 +33,7 @@ pub(crate) struct Behaviour<AppReqId: ReqId, TSpec: EthSpec> {
     /// Keep regular connection to peers and disconnect if absent.
     // NOTE: The id protocol is used for initial interop. This will be removed by mainnet.
     /// Provides IP addresses and peer information.
-    pub identify: Identify,
+    pub identify: identify::Behaviour,
     /// The peer manager that keeps track of peer's reputation and status.
     pub peer_manager: PeerManager<TSpec>,
 }
diff --git a/beacon_node/lighthouse_network/src/service/gossipsub_scoring_parameters.rs b/beacon_node/lighthouse_network/src/service/gossipsub_scoring_parameters.rs
index 88becd686e..b058fc0ff1 100644
--- a/beacon_node/lighthouse_network/src/service/gossipsub_scoring_parameters.rs
+++ b/beacon_node/lighthouse_network/src/service/gossipsub_scoring_parameters.rs
@@ -1,7 +1,8 @@
 use crate::types::{GossipEncoding, GossipKind, GossipTopic};
 use crate::{error, TopicHash};
 use libp2p::gossipsub::{
-    GossipsubConfig, IdentTopic as Topic, PeerScoreParams, PeerScoreThresholds, TopicScoreParams,
+    Config as GossipsubConfig, IdentTopic as Topic, PeerScoreParams, PeerScoreThresholds,
+    TopicScoreParams,
 };
 use std::cmp::max;
 use std::collections::HashMap;
diff --git a/beacon_node/lighthouse_network/src/service/mod.rs b/beacon_node/lighthouse_network/src/service/mod.rs
index 129a4da25b..63e5bcbff6 100644
--- a/beacon_node/lighthouse_network/src/service/mod.rs
+++ b/beacon_node/lighthouse_network/src/service/mod.rs
@@ -1,6 +1,6 @@
 use self::behaviour::Behaviour;
 use self::gossip_cache::GossipCache;
-use crate::config::{gossipsub_config, NetworkLoad};
+use crate::config::{gossipsub_config, GossipsubConfigParams, NetworkLoad};
 use crate::discovery::{
     subnet_predicate, DiscoveredPeers, Discovery, FIND_NODE_QUERY_CLOSEST_PEERS,
 };
@@ -24,15 +24,12 @@ use api_types::{PeerRequestId, Request, RequestId, Response};
 use futures::stream::StreamExt;
 use gossipsub_scoring_parameters::{lighthouse_gossip_thresholds, PeerScoreSettings};
 use libp2p::bandwidth::BandwidthSinks;
-use libp2p::gossipsub::error::PublishError;
-use libp2p::gossipsub::metrics::Config as GossipsubMetricsConfig;
-use libp2p::gossipsub::subscription_filter::MaxCountSubscriptionFilter;
 use libp2p::gossipsub::{
-    GossipsubEvent, IdentTopic as Topic, MessageAcceptance, MessageAuthenticity, MessageId,
+    self, IdentTopic as Topic, MessageAcceptance, MessageAuthenticity, MessageId, PublishError,
 };
-use libp2p::identify::{Behaviour as Identify, Config as IdentifyConfig, Event as IdentifyEvent};
+use libp2p::identify;
 use libp2p::multiaddr::{Multiaddr, Protocol as MProtocol};
-use libp2p::swarm::{ConnectionLimits, Swarm, SwarmBuilder, SwarmEvent};
+use libp2p::swarm::{Swarm, SwarmBuilder, SwarmEvent};
 use libp2p::PeerId;
 use slog::{crit, debug, info, o, trace, warn};
 use std::path::PathBuf;
@@ -66,10 +63,6 @@ pub enum NetworkEvent<AppReqId: ReqId, TSpec: EthSpec> {
     PeerConnectedIncoming(PeerId),
     /// A peer has disconnected.
     PeerDisconnected(PeerId),
-    /// The peer needs to be banned.
-    PeerBanned(PeerId),
-    /// The peer has been unbanned.
-    PeerUnbanned(PeerId),
     /// An RPC Request that was sent failed.
     RPCFailed {
         /// The id of the failed request.
@@ -229,7 +222,7 @@ impl<AppReqId: ReqId, TSpec: EthSpec> Network<AppReqId, TSpec> {
             let update_gossipsub_scores = tokio::time::interval(params.decay_interval);
 
             let possible_fork_digests = ctx.fork_context.all_fork_digests();
-            let filter = MaxCountSubscriptionFilter {
+            let filter = gossipsub::MaxCountSubscriptionFilter {
                 filter: utils::create_whitelist_filter(
                     possible_fork_digests,
                     ctx.chain_spec.attestation_subnet_count,
@@ -239,12 +232,20 @@ impl<AppReqId: ReqId, TSpec: EthSpec> Network<AppReqId, TSpec> {
                 max_subscriptions_per_request: 150, // 148 in theory = (64 attestation + 4 sync committee + 6 core topics) * 2
             };
 
-            config.gs_config = gossipsub_config(config.network_load, ctx.fork_context.clone());
+            let gossipsub_config_params = GossipsubConfigParams {
+                message_domain_valid_snappy: ctx.chain_spec.message_domain_valid_snappy,
+                gossip_max_size: ctx.chain_spec.gossip_max_size as usize,
+            };
+            config.gs_config = gossipsub_config(
+                config.network_load,
+                ctx.fork_context.clone(),
+                gossipsub_config_params,
+            );
 
             // If metrics are enabled for gossipsub build the configuration
             let gossipsub_metrics = ctx
                 .gossipsub_registry
-                .map(|registry| (registry, GossipsubMetricsConfig::default()));
+                .map(|registry| (registry, Default::default()));
 
             let snappy_transform = SnappyTransform::new(config.gs_config.max_transmit_size());
             let mut gossipsub = Gossipsub::new_with_subscription_filter_and_transform(
@@ -263,36 +264,48 @@ impl<AppReqId: ReqId, TSpec: EthSpec> Network<AppReqId, TSpec> {
             (gossipsub, update_gossipsub_scores)
         };
 
+        let network_params = NetworkParams {
+            max_chunk_size: ctx.chain_spec.max_chunk_size as usize,
+            ttfb_timeout: ctx.chain_spec.ttfb_timeout(),
+            resp_timeout: ctx.chain_spec.resp_timeout(),
+        };
         let eth2_rpc = RPC::new(
             ctx.fork_context.clone(),
             config.enable_light_client_server,
             config.inbound_rate_limiter_config.clone(),
             config.outbound_rate_limiter_config.clone(),
             log.clone(),
+            network_params,
         );
 
         let discovery = {
             // Build and start the discovery sub-behaviour
-            let mut discovery =
-                Discovery::new(&local_keypair, &config, network_globals.clone(), &log).await?;
+            let mut discovery = Discovery::new(
+                local_keypair.clone(),
+                &config,
+                network_globals.clone(),
+                &log,
+            )
+            .await?;
             // start searching for peers
             discovery.discover_peers(FIND_NODE_QUERY_CLOSEST_PEERS);
             discovery
         };
 
         let identify = {
+            let local_public_key = local_keypair.public();
             let identify_config = if config.private {
-                IdentifyConfig::new(
+                identify::Config::new(
                     "".into(),
-                    local_keypair.public(), // Still send legitimate public key
+                    local_public_key, // Still send legitimate public key
                 )
                 .with_cache_size(0)
             } else {
-                IdentifyConfig::new("eth2/1.0.0".into(), local_keypair.public())
+                identify::Config::new("eth2/1.0.0".into(), local_public_key)
                     .with_agent_version(lighthouse_version::version_with_platform())
                     .with_cache_size(0)
             };
-            Identify::new(identify_config)
+            identify::Behaviour::new(identify_config)
         };
 
         let peer_manager = {
@@ -305,13 +318,38 @@ impl<AppReqId: ReqId, TSpec: EthSpec> Network<AppReqId, TSpec> {
             PeerManager::new(peer_manager_cfg, network_globals.clone(), &log)?
         };
 
+        let connection_limits = {
+            let limits = libp2p::connection_limits::ConnectionLimits::default()
+                .with_max_pending_incoming(Some(5))
+                .with_max_pending_outgoing(Some(16))
+                .with_max_established_incoming(Some(
+                    (config.target_peers as f32
+                        * (1.0 + PEER_EXCESS_FACTOR - MIN_OUTBOUND_ONLY_FACTOR))
+                        .ceil() as u32,
+                ))
+                .with_max_established_outgoing(Some(
+                    (config.target_peers as f32 * (1.0 + PEER_EXCESS_FACTOR)).ceil() as u32,
+                ))
+                .with_max_established(Some(
+                    (config.target_peers as f32 * (1.0 + PEER_EXCESS_FACTOR + PRIORITY_PEER_EXCESS))
+                        .ceil() as u32,
+                ))
+                .with_max_established_per_peer(Some(MAX_CONNECTIONS_PER_PEER));
+
+            libp2p::connection_limits::Behaviour::new(limits)
+        };
+
+        let banned_peers = libp2p::allow_block_list::Behaviour::default();
+
         let behaviour = {
             Behaviour {
+                banned_peers,
                 gossipsub,
                 eth2_rpc,
                 discovery,
                 identify,
                 peer_manager,
+                connection_limits,
             }
         };
 
@@ -329,22 +367,6 @@ impl<AppReqId: ReqId, TSpec: EthSpec> Network<AppReqId, TSpec> {
             }
 
             // sets up the libp2p connection limits
-            let limits = ConnectionLimits::default()
-                .with_max_pending_incoming(Some(5))
-                .with_max_pending_outgoing(Some(16))
-                .with_max_established_incoming(Some(
-                    (config.target_peers as f32
-                        * (1.0 + PEER_EXCESS_FACTOR - MIN_OUTBOUND_ONLY_FACTOR))
-                        .ceil() as u32,
-                ))
-                .with_max_established_outgoing(Some(
-                    (config.target_peers as f32 * (1.0 + PEER_EXCESS_FACTOR)).ceil() as u32,
-                ))
-                .with_max_established(Some(
-                    (config.target_peers as f32 * (1.0 + PEER_EXCESS_FACTOR + PRIORITY_PEER_EXCESS))
-                        .ceil() as u32,
-                ))
-                .with_max_established_per_peer(Some(MAX_CONNECTIONS_PER_PEER));
 
             (
                 SwarmBuilder::with_executor(
@@ -354,8 +376,7 @@ impl<AppReqId: ReqId, TSpec: EthSpec> Network<AppReqId, TSpec> {
                     Executor(executor),
                 )
                 .notify_handler_buffer_size(std::num::NonZeroUsize::new(7).expect("Not zero"))
-                .connection_event_buffer_size(64)
-                .connection_limits(limits)
+                .per_connection_event_buffer_size(4)
                 .build(),
                 bandwidth,
             )
@@ -396,7 +417,7 @@ impl<AppReqId: ReqId, TSpec: EthSpec> Network<AppReqId, TSpec> {
             match self.swarm.listen_on(listen_multiaddr.clone()) {
                 Ok(_) => {
                     let mut log_address = listen_multiaddr;
-                    log_address.push(MProtocol::P2p(enr.peer_id().into()));
+                    log_address.push(MProtocol::P2p(enr.peer_id()));
                     info!(self.log, "Listening established"; "address" => %log_address);
                 }
                 Err(err) => {
@@ -493,7 +514,7 @@ impl<AppReqId: ReqId, TSpec: EthSpec> Network<AppReqId, TSpec> {
         &mut self.swarm.behaviour_mut().discovery
     }
     /// Provides IP addresses and peer information.
-    pub fn identify_mut(&mut self) -> &mut Identify {
+    pub fn identify_mut(&mut self) -> &mut identify::Behaviour {
         &mut self.swarm.behaviour_mut().identify
     }
     /// The peer manager that keeps track of peer's reputation and status.
@@ -514,7 +535,7 @@ impl<AppReqId: ReqId, TSpec: EthSpec> Network<AppReqId, TSpec> {
         &self.swarm.behaviour().discovery
     }
     /// Provides IP addresses and peer information.
-    pub fn identify(&self) -> &Identify {
+    pub fn identify(&self) -> &identify::Behaviour {
         &self.swarm.behaviour().identify
     }
     /// The peer manager that keeps track of peer's reputation and status.
@@ -1045,9 +1066,12 @@ impl<AppReqId: ReqId, TSpec: EthSpec> Network<AppReqId, TSpec> {
     /* Sub-behaviour event handling functions */
 
     /// Handle a gossipsub event.
-    fn inject_gs_event(&mut self, event: GossipsubEvent) -> Option<NetworkEvent<AppReqId, TSpec>> {
+    fn inject_gs_event(
+        &mut self,
+        event: gossipsub::Event,
+    ) -> Option<NetworkEvent<AppReqId, TSpec>> {
         match event {
-            GossipsubEvent::Message {
+            gossipsub::Event::Message {
                 propagation_source,
                 message_id: id,
                 message: gs_msg,
@@ -1077,7 +1101,7 @@ impl<AppReqId: ReqId, TSpec: EthSpec> Network<AppReqId, TSpec> {
                     }
                 }
             }
-            GossipsubEvent::Subscribed { peer_id, topic } => {
+            gossipsub::Event::Subscribed { peer_id, topic } => {
                 if let Ok(topic) = GossipTopic::decode(topic.as_str()) {
                     if let Some(subnet_id) = topic.subnet_id() {
                         self.network_globals
@@ -1118,7 +1142,7 @@ impl<AppReqId: ReqId, TSpec: EthSpec> Network<AppReqId, TSpec> {
                     }
                 }
             }
-            GossipsubEvent::Unsubscribed { peer_id, topic } => {
+            gossipsub::Event::Unsubscribed { peer_id, topic } => {
                 if let Some(subnet_id) = subnet_from_topic_hash(&topic) {
                     self.network_globals
                         .peers
@@ -1126,7 +1150,7 @@ impl<AppReqId: ReqId, TSpec: EthSpec> Network<AppReqId, TSpec> {
                         .remove_subscription(&peer_id, &subnet_id);
                 }
             }
-            GossipsubEvent::GossipsubNotSupported { peer_id } => {
+            gossipsub::Event::GossipsubNotSupported { peer_id } => {
                 debug!(self.log, "Peer does not support gossipsub"; "peer_id" => %peer_id);
                 self.peer_manager_mut().report_peer(
                     &peer_id,
@@ -1340,10 +1364,10 @@ impl<AppReqId: ReqId, TSpec: EthSpec> Network<AppReqId, TSpec> {
     /// Handle an identify event.
     fn inject_identify_event(
         &mut self,
-        event: IdentifyEvent,
+        event: identify::Event,
     ) -> Option<NetworkEvent<AppReqId, TSpec>> {
         match event {
-            IdentifyEvent::Received { peer_id, mut info } => {
+            identify::Event::Received { peer_id, mut info } => {
                 if info.listen_addrs.len() > MAX_IDENTIFY_ADDRESSES {
                     debug!(
                         self.log,
@@ -1354,9 +1378,9 @@ impl<AppReqId: ReqId, TSpec: EthSpec> Network<AppReqId, TSpec> {
                 // send peer info to the peer manager.
                 self.peer_manager_mut().identify(&peer_id, &info);
             }
-            IdentifyEvent::Sent { .. } => {}
-            IdentifyEvent::Error { .. } => {}
-            IdentifyEvent::Pushed { .. } => {}
+            identify::Event::Sent { .. } => {}
+            identify::Event::Error { .. } => {}
+            identify::Event::Pushed { .. } => {}
         }
         None
     }
@@ -1377,14 +1401,17 @@ impl<AppReqId: ReqId, TSpec: EthSpec> Network<AppReqId, TSpec> {
                 Some(NetworkEvent::PeerDisconnected(peer_id))
             }
             PeerManagerEvent::Banned(peer_id, associated_ips) => {
-                self.swarm.ban_peer_id(peer_id);
+                self.swarm.behaviour_mut().banned_peers.block_peer(peer_id);
                 self.discovery_mut().ban_peer(&peer_id, associated_ips);
-                Some(NetworkEvent::PeerBanned(peer_id))
+                None
             }
             PeerManagerEvent::UnBanned(peer_id, associated_ips) => {
-                self.swarm.unban_peer_id(peer_id);
+                self.swarm
+                    .behaviour_mut()
+                    .banned_peers
+                    .unblock_peer(peer_id);
                 self.discovery_mut().unban_peer(&peer_id, associated_ips);
-                Some(NetworkEvent::PeerUnbanned(peer_id))
+                None
             }
             PeerManagerEvent::Status(peer_id) => {
                 // it's time to status. We don't keep a beacon chain reference here, so we inform
@@ -1431,17 +1458,20 @@ impl<AppReqId: ReqId, TSpec: EthSpec> Network<AppReqId, TSpec> {
             let maybe_event = match swarm_event {
                 SwarmEvent::Behaviour(behaviour_event) => match behaviour_event {
                     // Handle sub-behaviour events.
+                    BehaviourEvent::BannedPeers(void) => void::unreachable(void),
                     BehaviourEvent::Gossipsub(ge) => self.inject_gs_event(ge),
                     BehaviourEvent::Eth2Rpc(re) => self.inject_rpc_event(re),
                     BehaviourEvent::Discovery(de) => self.inject_discovery_event(de),
                     BehaviourEvent::Identify(ie) => self.inject_identify_event(ie),
                     BehaviourEvent::PeerManager(pe) => self.inject_pm_event(pe),
+                    BehaviourEvent::ConnectionLimits(le) => void::unreachable(le),
                 },
                 SwarmEvent::ConnectionEstablished { .. } => None,
                 SwarmEvent::ConnectionClosed { .. } => None,
                 SwarmEvent::IncomingConnection {
                     local_addr,
                     send_back_addr,
+                    connection_id: _,
                 } => {
                     trace!(self.log, "Incoming connection"; "our_addr" => %local_addr, "from" => %send_back_addr);
                     None
@@ -1450,19 +1480,41 @@ impl<AppReqId: ReqId, TSpec: EthSpec> Network<AppReqId, TSpec> {
                     local_addr,
                     send_back_addr,
                     error,
+                    connection_id: _,
                 } => {
-                    debug!(self.log, "Failed incoming connection"; "our_addr" => %local_addr, "from" => %send_back_addr, "error" => %error);
+                    let error_repr = match error {
+                        libp2p::swarm::ListenError::Aborted => {
+                            "Incoming connection aborted".to_string()
+                        }
+                        libp2p::swarm::ListenError::WrongPeerId { obtained, endpoint } => {
+                            format!("Wrong peer id, obtained {obtained}, endpoint {endpoint:?}")
+                        }
+                        libp2p::swarm::ListenError::LocalPeerId { endpoint } => {
+                            format!("Dialing local peer id {endpoint:?}")
+                        }
+                        libp2p::swarm::ListenError::Denied { cause } => {
+                            format!("Connection was denied with cause {cause}")
+                        }
+                        libp2p::swarm::ListenError::Transport(t) => match t {
+                            libp2p::TransportError::MultiaddrNotSupported(m) => {
+                                format!("Transport error: Multiaddr not supported: {m}")
+                            }
+                            libp2p::TransportError::Other(e) => {
+                                format!("Transport error: other: {e}")
+                            }
+                        },
+                    };
+                    debug!(self.log, "Failed incoming connection"; "our_addr" => %local_addr, "from" => %send_back_addr, "error" => error_repr);
                     None
                 }
-                SwarmEvent::OutgoingConnectionError { peer_id, error } => {
-                    debug!(self.log, "Failed to dial address"; "peer_id" => ?peer_id,  "error" => %error);
-                    None
-                }
-                SwarmEvent::BannedPeer {
-                    peer_id,
-                    endpoint: _,
+                SwarmEvent::OutgoingConnectionError {
+                    peer_id: _,
+                    error: _,
+                    connection_id: _,
                 } => {
-                    debug!(self.log, "Banned peer connection rejected"; "peer_id" => %peer_id);
+                    // The Behaviour event is more general than the swarm event here. It includes
+                    // connection failures. So we use that log for now, in the peer manager
+                    // behaviour implementation.
                     None
                 }
                 SwarmEvent::NewListenAddr { address, .. } => {
@@ -1491,7 +1543,13 @@ impl<AppReqId: ReqId, TSpec: EthSpec> Network<AppReqId, TSpec> {
                         None
                     }
                 }
-                SwarmEvent::Dialing(_) => None,
+                SwarmEvent::Dialing {
+                    peer_id,
+                    connection_id: _,
+                } => {
+                    debug!(self.log, "Swarm Dialing"; "peer_id" => ?peer_id);
+                    None
+                }
             };
 
             if let Some(ev) = maybe_event {
diff --git a/beacon_node/lighthouse_network/src/service/utils.rs b/beacon_node/lighthouse_network/src/service/utils.rs
index ac0dc57d7b..b8acc4ed6d 100644
--- a/beacon_node/lighthouse_network/src/service/utils.rs
+++ b/beacon_node/lighthouse_network/src/service/utils.rs
@@ -4,13 +4,11 @@ use crate::types::{
     error, EnrAttestationBitfield, EnrSyncCommitteeBitfield, GossipEncoding, GossipKind,
 };
 use crate::{GossipTopic, NetworkConfig};
-use libp2p::bandwidth::{BandwidthLogging, BandwidthSinks};
-use libp2p::core::{
-    identity::Keypair, multiaddr::Multiaddr, muxing::StreamMuxerBox, transport::Boxed,
-};
-use libp2p::gossipsub::subscription_filter::WhitelistSubscriptionFilter;
-use libp2p::gossipsub::IdentTopic as Topic;
-use libp2p::{core, noise, PeerId, Transport};
+use libp2p::bandwidth::BandwidthSinks;
+use libp2p::core::{multiaddr::Multiaddr, muxing::StreamMuxerBox, transport::Boxed};
+use libp2p::gossipsub;
+use libp2p::identity::{secp256k1, Keypair};
+use libp2p::{core, noise, yamux, PeerId, Transport, TransportExt};
 use prometheus_client::registry::Registry;
 use slog::{debug, warn};
 use ssz::Decode;
@@ -52,30 +50,27 @@ pub fn build_transport(
         transport.or_transport(libp2p::websocket::WsConfig::new(trans_clone))
     };
 
-    let (transport, bandwidth) = BandwidthLogging::new(transport);
-
     // mplex config
-    let mut mplex_config = libp2p::mplex::MplexConfig::new();
+    let mut mplex_config = libp2p_mplex::MplexConfig::new();
     mplex_config.set_max_buffer_size(256);
-    mplex_config.set_max_buffer_behaviour(libp2p::mplex::MaxBufferBehaviour::Block);
+    mplex_config.set_max_buffer_behaviour(libp2p_mplex::MaxBufferBehaviour::Block);
 
     // yamux config
-    let mut yamux_config = libp2p::yamux::YamuxConfig::default();
-    yamux_config.set_window_update_mode(libp2p::yamux::WindowUpdateMode::on_read());
+    let mut yamux_config = yamux::Config::default();
+    yamux_config.set_window_update_mode(yamux::WindowUpdateMode::on_read());
+    let (transport, bandwidth) = transport
+        .upgrade(core::upgrade::Version::V1)
+        .authenticate(generate_noise_config(&local_private_key))
+        .multiplex(core::upgrade::SelectUpgrade::new(
+            yamux_config,
+            mplex_config,
+        ))
+        .timeout(Duration::from_secs(10))
+        .boxed()
+        .with_bandwidth_logging();
 
     // Authentication
-    Ok((
-        transport
-            .upgrade(core::upgrade::Version::V1)
-            .authenticate(generate_noise_config(&local_private_key))
-            .multiplex(core::upgrade::SelectUpgrade::new(
-                yamux_config,
-                mplex_config,
-            ))
-            .timeout(Duration::from_secs(10))
-            .boxed(),
-        bandwidth,
-    ))
+    Ok((transport, bandwidth))
 }
 
 // Useful helper functions for debugging. Currently not used in the client.
@@ -94,10 +89,10 @@ fn keypair_from_hex(hex_bytes: &str) -> error::Result<Keypair> {
 
 #[allow(dead_code)]
 fn keypair_from_bytes(mut bytes: Vec<u8>) -> error::Result<Keypair> {
-    libp2p::core::identity::secp256k1::SecretKey::from_bytes(&mut bytes)
+    secp256k1::SecretKey::try_from_bytes(&mut bytes)
         .map(|secret| {
-            let keypair: libp2p::core::identity::secp256k1::Keypair = secret.into();
-            Keypair::Secp256k1(keypair)
+            let keypair: secp256k1::Keypair = secret.into();
+            keypair.into()
         })
         .map_err(|e| format!("Unable to parse p2p secret key: {:?}", e).into())
 }
@@ -115,12 +110,10 @@ pub fn load_private_key(config: &NetworkConfig, log: &slog::Logger) -> Keypair {
             Err(_) => debug!(log, "Could not read network key file"),
             Ok(_) => {
                 // only accept secp256k1 keys for now
-                if let Ok(secret_key) =
-                    libp2p::core::identity::secp256k1::SecretKey::from_bytes(&mut key_bytes)
-                {
-                    let kp: libp2p::core::identity::secp256k1::Keypair = secret_key.into();
+                if let Ok(secret_key) = secp256k1::SecretKey::try_from_bytes(&mut key_bytes) {
+                    let kp: secp256k1::Keypair = secret_key.into();
                     debug!(log, "Loaded network key from disk.");
-                    return Keypair::Secp256k1(kp);
+                    return kp.into();
                 } else {
                     debug!(log, "Network key file is not a valid secp256k1 key");
                 }
@@ -129,34 +122,27 @@ pub fn load_private_key(config: &NetworkConfig, log: &slog::Logger) -> Keypair {
     }
 
     // if a key could not be loaded from disk, generate a new one and save it
-    let local_private_key = Keypair::generate_secp256k1();
-    if let Keypair::Secp256k1(key) = local_private_key.clone() {
-        let _ = std::fs::create_dir_all(&config.network_dir);
-        match File::create(network_key_f.clone())
-            .and_then(|mut f| f.write_all(&key.secret().to_bytes()))
-        {
-            Ok(_) => {
-                debug!(log, "New network key generated and written to disk");
-            }
-            Err(e) => {
-                warn!(
-                    log,
-                    "Could not write node key to file: {:?}. error: {}", network_key_f, e
-                );
-            }
+    let local_private_key = secp256k1::Keypair::generate();
+    let _ = std::fs::create_dir_all(&config.network_dir);
+    match File::create(network_key_f.clone())
+        .and_then(|mut f| f.write_all(&local_private_key.secret().to_bytes()))
+    {
+        Ok(_) => {
+            debug!(log, "New network key generated and written to disk");
+        }
+        Err(e) => {
+            warn!(
+                log,
+                "Could not write node key to file: {:?}. error: {}", network_key_f, e
+            );
         }
     }
-    local_private_key
+    local_private_key.into()
 }
 
 /// Generate authenticated XX Noise config from identity keys
-fn generate_noise_config(
-    identity_keypair: &Keypair,
-) -> noise::NoiseAuthenticated<noise::XX, noise::X25519Spec, ()> {
-    let static_dh_keys = noise::Keypair::<noise::X25519Spec>::new()
-        .into_authentic(identity_keypair)
-        .expect("signing can fail only once during starting a node");
-    noise::NoiseConfig::xx(static_dh_keys).into_authenticated()
+fn generate_noise_config(identity_keypair: &Keypair) -> noise::Config {
+    noise::Config::new(identity_keypair).expect("signing can fail only once during starting a node")
 }
 
 /// For a multiaddr that ends with a peer id, this strips this suffix. Rust-libp2p
@@ -236,11 +222,11 @@ pub(crate) fn create_whitelist_filter(
     possible_fork_digests: Vec<[u8; 4]>,
     attestation_subnet_count: u64,
     sync_committee_subnet_count: u64,
-) -> WhitelistSubscriptionFilter {
+) -> gossipsub::WhitelistSubscriptionFilter {
     let mut possible_hashes = HashSet::new();
     for fork_digest in possible_fork_digests {
         let mut add = |kind| {
-            let topic: Topic =
+            let topic: gossipsub::IdentTopic =
                 GossipTopic::new(kind, GossipEncoding::SSZSnappy, fork_digest).into();
             possible_hashes.insert(topic.hash());
         };
@@ -262,7 +248,7 @@ pub(crate) fn create_whitelist_filter(
             add(SyncCommitteeMessage(SyncSubnetId::new(id)));
         }
     }
-    WhitelistSubscriptionFilter(possible_hashes)
+    gossipsub::WhitelistSubscriptionFilter(possible_hashes)
 }
 
 /// Persist metadata to disk
diff --git a/beacon_node/lighthouse_network/src/types/globals.rs b/beacon_node/lighthouse_network/src/types/globals.rs
index 295616f36b..97eaaa0051 100644
--- a/beacon_node/lighthouse_network/src/types/globals.rs
+++ b/beacon_node/lighthouse_network/src/types/globals.rs
@@ -134,9 +134,8 @@ impl<TSpec: EthSpec> NetworkGlobals<TSpec> {
         log: &slog::Logger,
     ) -> NetworkGlobals<TSpec> {
         use crate::CombinedKeyExt;
-        let keypair = libp2p::identity::Keypair::generate_secp256k1();
-        let enr_key: discv5::enr::CombinedKey =
-            discv5::enr::CombinedKey::from_libp2p(&keypair).unwrap();
+        let keypair = libp2p::identity::secp256k1::Keypair::generate();
+        let enr_key: discv5::enr::CombinedKey = discv5::enr::CombinedKey::from_secp256k1(&keypair);
         let enr = discv5::enr::EnrBuilder::new("v4").build(&enr_key).unwrap();
         NetworkGlobals::new(
             enr,
diff --git a/beacon_node/lighthouse_network/src/types/pubsub.rs b/beacon_node/lighthouse_network/src/types/pubsub.rs
index bb0397de1e..06732ac99f 100644
--- a/beacon_node/lighthouse_network/src/types/pubsub.rs
+++ b/beacon_node/lighthouse_network/src/types/pubsub.rs
@@ -2,7 +2,7 @@
 
 use crate::types::{GossipEncoding, GossipKind, GossipTopic};
 use crate::TopicHash;
-use libp2p::gossipsub::{DataTransform, GossipsubMessage, RawGossipsubMessage};
+use libp2p::gossipsub;
 use snap::raw::{decompress_len, Decoder, Encoder};
 use ssz::{Decode, Encode};
 use std::boxed::Box;
@@ -56,12 +56,12 @@ impl SnappyTransform {
     }
 }
 
-impl DataTransform for SnappyTransform {
+impl gossipsub::DataTransform for SnappyTransform {
     // Provides the snappy decompression from RawGossipsubMessages
     fn inbound_transform(
         &self,
-        raw_message: RawGossipsubMessage,
-    ) -> Result<GossipsubMessage, std::io::Error> {
+        raw_message: gossipsub::RawMessage,
+    ) -> Result<gossipsub::Message, std::io::Error> {
         // check the length of the raw bytes
         let len = decompress_len(&raw_message.data)?;
         if len > self.max_size_per_message {
@@ -75,7 +75,7 @@ impl DataTransform for SnappyTransform {
         let decompressed_data = decoder.decompress_vec(&raw_message.data)?;
 
         // Build the GossipsubMessage struct
-        Ok(GossipsubMessage {
+        Ok(gossipsub::Message {
             source: raw_message.source,
             data: decompressed_data,
             sequence_number: raw_message.sequence_number,
diff --git a/beacon_node/lighthouse_network/tests/common.rs b/beacon_node/lighthouse_network/tests/common.rs
index 64714cbc0a..36a2e52385 100644
--- a/beacon_node/lighthouse_network/tests/common.rs
+++ b/beacon_node/lighthouse_network/tests/common.rs
@@ -1,5 +1,5 @@
 #![cfg(test)]
-use libp2p::gossipsub::GossipsubConfigBuilder;
+use libp2p::gossipsub;
 use lighthouse_network::service::Network as LibP2PService;
 use lighthouse_network::Enr;
 use lighthouse_network::EnrExt;
@@ -81,7 +81,7 @@ pub fn build_config(port: u16, mut boot_nodes: Vec<Enr>) -> NetworkConfig {
     config.boot_nodes_enr.append(&mut boot_nodes);
     config.network_dir = path.into_path();
     // Reduce gossipsub heartbeat parameters
-    config.gs_config = GossipsubConfigBuilder::from(config.gs_config)
+    config.gs_config = gossipsub::ConfigBuilder::from(config.gs_config)
         .heartbeat_initial_delay(Duration::from_millis(500))
         .heartbeat_interval(Duration::from_millis(500))
         .build()
@@ -94,6 +94,7 @@ pub async fn build_libp2p_instance(
     boot_nodes: Vec<Enr>,
     log: slog::Logger,
     fork_name: ForkName,
+    spec: &ChainSpec,
 ) -> Libp2pInstance {
     let port = unused_tcp4_port().unwrap();
     let config = build_config(port, boot_nodes);
@@ -106,7 +107,7 @@ pub async fn build_libp2p_instance(
         config: &config,
         enr_fork_id: EnrForkId::default(),
         fork_context: Arc::new(fork_context(fork_name)),
-        chain_spec: &ChainSpec::minimal(),
+        chain_spec: spec,
         gossipsub_registry: None,
     };
     Libp2pInstance(
@@ -130,12 +131,13 @@ pub async fn build_node_pair(
     rt: Weak<Runtime>,
     log: &slog::Logger,
     fork_name: ForkName,
+    spec: &ChainSpec,
 ) -> (Libp2pInstance, Libp2pInstance) {
     let sender_log = log.new(o!("who" => "sender"));
     let receiver_log = log.new(o!("who" => "receiver"));
 
-    let mut sender = build_libp2p_instance(rt.clone(), vec![], sender_log, fork_name).await;
-    let mut receiver = build_libp2p_instance(rt, vec![], receiver_log, fork_name).await;
+    let mut sender = build_libp2p_instance(rt.clone(), vec![], sender_log, fork_name, spec).await;
+    let mut receiver = build_libp2p_instance(rt, vec![], receiver_log, fork_name, spec).await;
 
     let receiver_multiaddr = receiver.local_enr().multiaddr()[1].clone();
 
@@ -180,10 +182,11 @@ pub async fn build_linear(
     log: slog::Logger,
     n: usize,
     fork_name: ForkName,
+    spec: &ChainSpec,
 ) -> Vec<Libp2pInstance> {
     let mut nodes = Vec::with_capacity(n);
     for _ in 0..n {
-        nodes.push(build_libp2p_instance(rt.clone(), vec![], log.clone(), fork_name).await);
+        nodes.push(build_libp2p_instance(rt.clone(), vec![], log.clone(), fork_name, spec).await);
     }
 
     let multiaddrs: Vec<Multiaddr> = nodes
diff --git a/beacon_node/lighthouse_network/tests/rpc_tests.rs b/beacon_node/lighthouse_network/tests/rpc_tests.rs
index 656df0c4a1..05fa5ab854 100644
--- a/beacon_node/lighthouse_network/tests/rpc_tests.rs
+++ b/beacon_node/lighthouse_network/tests/rpc_tests.rs
@@ -9,8 +9,9 @@ use std::time::Duration;
 use tokio::runtime::Runtime;
 use tokio::time::sleep;
 use types::{
-    BeaconBlock, BeaconBlockAltair, BeaconBlockBase, BeaconBlockMerge, EmptyBlock, Epoch, EthSpec,
-    ForkContext, ForkName, Hash256, MinimalEthSpec, Signature, SignedBeaconBlock, Slot,
+    BeaconBlock, BeaconBlockAltair, BeaconBlockBase, BeaconBlockMerge, ChainSpec, EmptyBlock,
+    Epoch, EthSpec, ForkContext, ForkName, Hash256, MinimalEthSpec, Signature, SignedBeaconBlock,
+    Slot,
 };
 
 mod common;
@@ -18,30 +19,30 @@ mod common;
 type E = MinimalEthSpec;
 
 /// Merge block with length < max_rpc_size.
-fn merge_block_small(fork_context: &ForkContext) -> BeaconBlock<E> {
-    let mut block = BeaconBlockMerge::<E>::empty(&E::default_spec());
+fn merge_block_small(fork_context: &ForkContext, spec: &ChainSpec) -> BeaconBlock<E> {
+    let mut block = BeaconBlockMerge::<E>::empty(spec);
     let tx = VariableList::from(vec![0; 1024]);
     let txs = VariableList::from(std::iter::repeat(tx).take(5000).collect::<Vec<_>>());
 
     block.body.execution_payload.execution_payload.transactions = txs;
 
     let block = BeaconBlock::Merge(block);
-    assert!(block.ssz_bytes_len() <= max_rpc_size(fork_context));
+    assert!(block.ssz_bytes_len() <= max_rpc_size(fork_context, spec.max_chunk_size as usize));
     block
 }
 
 /// Merge block with length > MAX_RPC_SIZE.
 /// The max limit for a merge block is in the order of ~16GiB which wouldn't fit in memory.
 /// Hence, we generate a merge block just greater than `MAX_RPC_SIZE` to test rejection on the rpc layer.
-fn merge_block_large(fork_context: &ForkContext) -> BeaconBlock<E> {
-    let mut block = BeaconBlockMerge::<E>::empty(&E::default_spec());
+fn merge_block_large(fork_context: &ForkContext, spec: &ChainSpec) -> BeaconBlock<E> {
+    let mut block = BeaconBlockMerge::<E>::empty(spec);
     let tx = VariableList::from(vec![0; 1024]);
     let txs = VariableList::from(std::iter::repeat(tx).take(100000).collect::<Vec<_>>());
 
     block.body.execution_payload.execution_payload.transactions = txs;
 
     let block = BeaconBlock::Merge(block);
-    assert!(block.ssz_bytes_len() > max_rpc_size(fork_context));
+    assert!(block.ssz_bytes_len() > max_rpc_size(fork_context, spec.max_chunk_size as usize));
     block
 }
 
@@ -57,10 +58,12 @@ fn test_status_rpc() {
 
     let log = common::build_log(log_level, enable_logging);
 
+    let spec = E::default_spec();
+
     rt.block_on(async {
         // get sender/receiver
         let (mut sender, mut receiver) =
-            common::build_node_pair(Arc::downgrade(&rt), &log, ForkName::Base).await;
+            common::build_node_pair(Arc::downgrade(&rt), &log, ForkName::Base, &spec).await;
 
         // Dummy STATUS RPC message
         let rpc_request = Request::Status(StatusMessage {
@@ -149,10 +152,12 @@ fn test_blocks_by_range_chunked_rpc() {
 
     let rt = Arc::new(Runtime::new().unwrap());
 
+    let spec = E::default_spec();
+
     rt.block_on(async {
         // get sender/receiver
         let (mut sender, mut receiver) =
-            common::build_node_pair(Arc::downgrade(&rt), &log, ForkName::Merge).await;
+            common::build_node_pair(Arc::downgrade(&rt), &log, ForkName::Merge, &spec).await;
 
         // BlocksByRange Request
         let rpc_request = Request::BlocksByRange(BlocksByRangeRequest::new(0, messages_to_send));
@@ -168,7 +173,7 @@ fn test_blocks_by_range_chunked_rpc() {
         let signed_full_block = SignedBeaconBlock::from_block(full_block, Signature::empty());
         let rpc_response_altair = Response::BlocksByRange(Some(Arc::new(signed_full_block)));
 
-        let full_block = merge_block_small(&common::fork_context(ForkName::Merge));
+        let full_block = merge_block_small(&common::fork_context(ForkName::Merge), &spec);
         let signed_full_block = SignedBeaconBlock::from_block(full_block, Signature::empty());
         let rpc_response_merge_small = Response::BlocksByRange(Some(Arc::new(signed_full_block)));
 
@@ -273,16 +278,18 @@ fn test_blocks_by_range_over_limit() {
 
     let rt = Arc::new(Runtime::new().unwrap());
 
+    let spec = E::default_spec();
+
     rt.block_on(async {
         // get sender/receiver
         let (mut sender, mut receiver) =
-            common::build_node_pair(Arc::downgrade(&rt), &log, ForkName::Merge).await;
+            common::build_node_pair(Arc::downgrade(&rt), &log, ForkName::Merge, &spec).await;
 
         // BlocksByRange Request
         let rpc_request = Request::BlocksByRange(BlocksByRangeRequest::new(0, messages_to_send));
 
         // BlocksByRange Response
-        let full_block = merge_block_large(&common::fork_context(ForkName::Merge));
+        let full_block = merge_block_large(&common::fork_context(ForkName::Merge), &spec);
         let signed_full_block = SignedBeaconBlock::from_block(full_block, Signature::empty());
         let rpc_response_merge_large = Response::BlocksByRange(Some(Arc::new(signed_full_block)));
 
@@ -355,10 +362,12 @@ fn test_blocks_by_range_chunked_rpc_terminates_correctly() {
 
     let rt = Arc::new(Runtime::new().unwrap());
 
+    let spec = E::default_spec();
+
     rt.block_on(async {
         // get sender/receiver
         let (mut sender, mut receiver) =
-            common::build_node_pair(Arc::downgrade(&rt), &log, ForkName::Base).await;
+            common::build_node_pair(Arc::downgrade(&rt), &log, ForkName::Base, &spec).await;
 
         // BlocksByRange Request
         let rpc_request = Request::BlocksByRange(BlocksByRangeRequest::new(0, messages_to_send));
@@ -475,10 +484,12 @@ fn test_blocks_by_range_single_empty_rpc() {
     let log = common::build_log(log_level, enable_logging);
     let rt = Arc::new(Runtime::new().unwrap());
 
+    let spec = E::default_spec();
+
     rt.block_on(async {
         // get sender/receiver
         let (mut sender, mut receiver) =
-            common::build_node_pair(Arc::downgrade(&rt), &log, ForkName::Base).await;
+            common::build_node_pair(Arc::downgrade(&rt), &log, ForkName::Base, &spec).await;
 
         // BlocksByRange Request
         let rpc_request = Request::BlocksByRange(BlocksByRangeRequest::new(0, 10));
@@ -579,7 +590,7 @@ fn test_blocks_by_root_chunked_rpc() {
     // get sender/receiver
     rt.block_on(async {
         let (mut sender, mut receiver) =
-            common::build_node_pair(Arc::downgrade(&rt), &log, ForkName::Merge).await;
+            common::build_node_pair(Arc::downgrade(&rt), &log, ForkName::Merge, &spec).await;
 
         // BlocksByRoot Request
         let rpc_request =
@@ -601,7 +612,7 @@ fn test_blocks_by_root_chunked_rpc() {
         let signed_full_block = SignedBeaconBlock::from_block(full_block, Signature::empty());
         let rpc_response_altair = Response::BlocksByRoot(Some(Arc::new(signed_full_block)));
 
-        let full_block = merge_block_small(&common::fork_context(ForkName::Merge));
+        let full_block = merge_block_small(&common::fork_context(ForkName::Merge), &spec);
         let signed_full_block = SignedBeaconBlock::from_block(full_block, Signature::empty());
         let rpc_response_merge_small = Response::BlocksByRoot(Some(Arc::new(signed_full_block)));
 
@@ -706,7 +717,7 @@ fn test_blocks_by_root_chunked_rpc_terminates_correctly() {
     // get sender/receiver
     rt.block_on(async {
         let (mut sender, mut receiver) =
-            common::build_node_pair(Arc::downgrade(&rt), &log, ForkName::Base).await;
+            common::build_node_pair(Arc::downgrade(&rt), &log, ForkName::Base, &spec).await;
 
         // BlocksByRoot Request
         let rpc_request =
@@ -833,10 +844,13 @@ fn test_goodbye_rpc() {
     let log = common::build_log(log_level, enable_logging);
 
     let rt = Arc::new(Runtime::new().unwrap());
+
+    let spec = E::default_spec();
+
     // get sender/receiver
     rt.block_on(async {
         let (mut sender, mut receiver) =
-            common::build_node_pair(Arc::downgrade(&rt), &log, ForkName::Base).await;
+            common::build_node_pair(Arc::downgrade(&rt), &log, ForkName::Base, &spec).await;
 
         // build the sender future
         let sender_future = async {
diff --git a/beacon_node/network/Cargo.toml b/beacon_node/network/Cargo.toml
index aa1827787c..715e77bcad 100644
--- a/beacon_node/network/Cargo.toml
+++ b/beacon_node/network/Cargo.toml
@@ -11,7 +11,6 @@ matches = "0.1.8"
 exit-future = "0.2.0"
 slog-term = "2.6.0"
 slog-async = "2.5.0"
-environment = { path = "../../lighthouse/environment" }
 
 [dependencies]
 beacon_chain =  { path = "../beacon_chain" }
@@ -37,7 +36,6 @@ logging = { path = "../../common/logging" }
 task_executor = { path = "../../common/task_executor" }
 igd = "0.12.1"
 itertools = "0.10.0"
-num_cpus = "1.13.0"
 lru_cache = { path = "../../common/lru_cache" }
 if-addrs = "0.6.4"
 strum = "0.24.0"
@@ -46,4 +44,11 @@ derivative = "2.2.0"
 delay_map = "0.3.0"
 ethereum-types = { version = "0.14.1", optional = true }
 operation_pool =  { path = "../operation_pool" }
-execution_layer =  { path = "../execution_layer" }
\ No newline at end of file
+execution_layer =  { path = "../execution_layer" }
+beacon_processor =  { path = "../beacon_processor" }
+parking_lot = "0.12.0"
+environment = { path = "../../lighthouse/environment" }
+
+[features]
+# NOTE: This can be run via cargo build --bin lighthouse --features network/disable-backfill
+disable-backfill = []
diff --git a/beacon_node/network/src/beacon_processor/worker/mod.rs b/beacon_node/network/src/beacon_processor/worker/mod.rs
deleted file mode 100644
index 1cbc64b632..0000000000
--- a/beacon_node/network/src/beacon_processor/worker/mod.rs
+++ /dev/null
@@ -1,51 +0,0 @@
-use super::work_reprocessing_queue::ReprocessQueueMessage;
-use crate::{service::NetworkMessage, sync::SyncMessage};
-use beacon_chain::{BeaconChain, BeaconChainTypes};
-use slog::{debug, Logger};
-use std::sync::Arc;
-use tokio::sync::mpsc;
-
-mod gossip_methods;
-mod rpc_methods;
-mod sync_methods;
-
-pub use gossip_methods::{GossipAggregatePackage, GossipAttestationPackage};
-pub use sync_methods::ChainSegmentProcessId;
-
-pub(crate) const FUTURE_SLOT_TOLERANCE: u64 = 1;
-
-/// Contains the context necessary to import blocks, attestations, etc to the beacon chain.
-pub struct Worker<T: BeaconChainTypes> {
-    pub chain: Arc<BeaconChain<T>>,
-    pub network_tx: mpsc::UnboundedSender<NetworkMessage<T::EthSpec>>,
-    pub sync_tx: mpsc::UnboundedSender<SyncMessage<T::EthSpec>>,
-    pub log: Logger,
-}
-
-impl<T: BeaconChainTypes> Worker<T> {
-    /// Send a message to `sync_tx`.
-    ///
-    /// Creates a log if there is an internal error.
-    fn send_sync_message(&self, message: SyncMessage<T::EthSpec>) {
-        self.sync_tx.send(message).unwrap_or_else(|e| {
-            debug!(self.log, "Could not send message to the sync service";
-                   "error" => %e)
-        });
-    }
-
-    /// Send a message to `network_tx`.
-    ///
-    /// Creates a log if there is an internal error.
-    fn send_network_message(&self, message: NetworkMessage<T::EthSpec>) {
-        self.network_tx.send(message).unwrap_or_else(|e| {
-            debug!(self.log, "Could not send message to the network service. Likely shutdown";
-                "error" => %e)
-        });
-    }
-}
-
-/// Contains the necessary items for a worker to do their job.
-pub struct Toolbox<T: BeaconChainTypes> {
-    pub idle_tx: mpsc::Sender<()>,
-    pub work_reprocessing_tx: mpsc::Sender<ReprocessQueueMessage<T>>,
-}
diff --git a/beacon_node/network/src/lib.rs b/beacon_node/network/src/lib.rs
index 648c636acc..da64368b16 100644
--- a/beacon_node/network/src/lib.rs
+++ b/beacon_node/network/src/lib.rs
@@ -6,10 +6,10 @@ pub mod error;
 #[allow(clippy::mutable_key_type)] // PeerId in hashmaps are no longer permitted by clippy
 pub mod service;
 
-mod beacon_processor;
 #[allow(clippy::mutable_key_type)] // PeerId in hashmaps are no longer permitted by clippy
 mod metrics;
 mod nat;
+mod network_beacon_processor;
 mod persisted_dht;
 mod router;
 mod status;
diff --git a/beacon_node/network/src/metrics.rs b/beacon_node/network/src/metrics.rs
index 27d7dc9625..0144824861 100644
--- a/beacon_node/network/src/metrics.rs
+++ b/beacon_node/network/src/metrics.rs
@@ -49,47 +49,8 @@ lazy_static! {
     /*
      * Gossip processor
      */
-    pub static ref BEACON_PROCESSOR_WORK_EVENTS_RX_COUNT: Result<IntCounterVec> = try_create_int_counter_vec(
-        "beacon_processor_work_events_rx_count",
-        "Count of work events received (but not necessarily processed)",
-        &["type"]
-    );
-    pub static ref BEACON_PROCESSOR_WORK_EVENTS_IGNORED_COUNT: Result<IntCounterVec> = try_create_int_counter_vec(
-        "beacon_processor_work_events_ignored_count",
-        "Count of work events purposefully ignored",
-        &["type"]
-    );
-    pub static ref BEACON_PROCESSOR_WORK_EVENTS_STARTED_COUNT: Result<IntCounterVec> = try_create_int_counter_vec(
-        "beacon_processor_work_events_started_count",
-        "Count of work events which have been started by a worker",
-        &["type"]
-    );
-    pub static ref BEACON_PROCESSOR_WORKER_TIME: Result<HistogramVec> = try_create_histogram_vec(
-        "beacon_processor_worker_time",
-        "Time taken for a worker to fully process some parcel of work.",
-        &["type"]
-    );
-    pub static ref BEACON_PROCESSOR_WORKERS_SPAWNED_TOTAL: Result<IntCounter> = try_create_int_counter(
-        "beacon_processor_workers_spawned_total",
-        "The number of workers ever spawned by the gossip processing pool."
-    );
-    pub static ref BEACON_PROCESSOR_WORKERS_ACTIVE_TOTAL: Result<IntGauge> = try_create_int_gauge(
-        "beacon_processor_workers_active_total",
-        "Count of active workers in the gossip processing pool."
-    );
-    pub static ref BEACON_PROCESSOR_IDLE_EVENTS_TOTAL: Result<IntCounter> = try_create_int_counter(
-        "beacon_processor_idle_events_total",
-        "Count of idle events processed by the gossip processor manager."
-    );
-    pub static ref BEACON_PROCESSOR_EVENT_HANDLING_SECONDS: Result<Histogram> = try_create_histogram(
-        "beacon_processor_event_handling_seconds",
-        "Time spent handling a new message and allocating it to a queue or worker."
-    );
+
     // Gossip blocks.
-    pub static ref BEACON_PROCESSOR_GOSSIP_BLOCK_QUEUE_TOTAL: Result<IntGauge> = try_create_int_gauge(
-        "beacon_processor_gossip_block_queue_total",
-        "Count of blocks from gossip waiting to be verified."
-    );
     pub static ref BEACON_PROCESSOR_GOSSIP_BLOCK_VERIFIED_TOTAL: Result<IntCounter> = try_create_int_counter(
         "beacon_processor_gossip_block_verified_total",
         "Total number of gossip blocks verified for propagation."
@@ -107,10 +68,6 @@ lazy_static! {
         "Whenever a gossip block is received early this metrics is set to how early that block was."
     );
     // Gossip Exits.
-    pub static ref BEACON_PROCESSOR_EXIT_QUEUE_TOTAL: Result<IntGauge> = try_create_int_gauge(
-        "beacon_processor_exit_queue_total",
-        "Count of exits from gossip waiting to be verified."
-    );
     pub static ref BEACON_PROCESSOR_EXIT_VERIFIED_TOTAL: Result<IntCounter> = try_create_int_counter(
         "beacon_processor_exit_verified_total",
         "Total number of voluntary exits verified for propagation."
@@ -120,10 +77,6 @@ lazy_static! {
         "Total number of voluntary exits imported to the op pool."
     );
     // Gossip proposer slashings.
-    pub static ref BEACON_PROCESSOR_PROPOSER_SLASHING_QUEUE_TOTAL: Result<IntGauge> = try_create_int_gauge(
-        "beacon_processor_proposer_slashing_queue_total",
-        "Count of proposer slashings from gossip waiting to be verified."
-    );
     pub static ref BEACON_PROCESSOR_PROPOSER_SLASHING_VERIFIED_TOTAL: Result<IntCounter> = try_create_int_counter(
         "beacon_processor_proposer_slashing_verified_total",
         "Total number of proposer slashings verified for propagation."
@@ -133,10 +86,6 @@ lazy_static! {
         "Total number of proposer slashings imported to the op pool."
     );
     // Gossip attester slashings.
-    pub static ref BEACON_PROCESSOR_ATTESTER_SLASHING_QUEUE_TOTAL: Result<IntGauge> = try_create_int_gauge(
-        "beacon_processor_attester_slashing_queue_total",
-        "Count of attester slashings from gossip waiting to be verified."
-    );
     pub static ref BEACON_PROCESSOR_ATTESTER_SLASHING_VERIFIED_TOTAL: Result<IntCounter> = try_create_int_counter(
         "beacon_processor_attester_slashing_verified_total",
         "Total number of attester slashings verified for propagation."
@@ -146,10 +95,6 @@ lazy_static! {
         "Total number of attester slashings imported to the op pool."
     );
     // Gossip BLS to execution changes.
-    pub static ref BEACON_PROCESSOR_BLS_TO_EXECUTION_CHANGE_QUEUE_TOTAL: Result<IntGauge> = try_create_int_gauge(
-        "beacon_processor_bls_to_execution_change_queue_total",
-        "Count of address changes from gossip waiting to be verified."
-    );
     pub static ref BEACON_PROCESSOR_BLS_TO_EXECUTION_CHANGE_VERIFIED_TOTAL: Result<IntCounter> = try_create_int_counter(
         "beacon_processor_bls_to_execution_change_verified_total",
         "Total number of address changes verified for propagation."
@@ -159,23 +104,11 @@ lazy_static! {
         "Total number of address changes imported to the op pool."
     );
     // Rpc blocks.
-    pub static ref BEACON_PROCESSOR_RPC_BLOCK_QUEUE_TOTAL: Result<IntGauge> = try_create_int_gauge(
-        "beacon_processor_rpc_block_queue_total",
-        "Count of blocks from the rpc waiting to be verified."
-    );
     pub static ref BEACON_PROCESSOR_RPC_BLOCK_IMPORTED_TOTAL: Result<IntCounter> = try_create_int_counter(
         "beacon_processor_rpc_block_imported_total",
         "Total number of gossip blocks imported to fork choice, etc."
     );
     // Chain segments.
-    pub static ref BEACON_PROCESSOR_CHAIN_SEGMENT_QUEUE_TOTAL: Result<IntGauge> = try_create_int_gauge(
-        "beacon_processor_chain_segment_queue_total",
-        "Count of chain segments from the rpc waiting to be verified."
-    );
-    pub static ref BEACON_PROCESSOR_BACKFILL_CHAIN_SEGMENT_QUEUE_TOTAL: Result<IntGauge> = try_create_int_gauge(
-        "beacon_processor_backfill_chain_segment_queue_total",
-        "Count of backfill chain segments from the rpc waiting to be verified."
-    );
     pub static ref BEACON_PROCESSOR_CHAIN_SEGMENT_SUCCESS_TOTAL: Result<IntCounter> = try_create_int_counter(
         "beacon_processor_chain_segment_success_total",
         "Total number of chain segments successfully processed."
@@ -193,10 +126,6 @@ lazy_static! {
         "Total number of backfill chain segments that failed processing."
     );
     // Unaggregated attestations.
-    pub static ref BEACON_PROCESSOR_UNAGGREGATED_ATTESTATION_QUEUE_TOTAL: Result<IntGauge> = try_create_int_gauge(
-        "beacon_processor_unaggregated_attestation_queue_total",
-        "Count of unagg. attestations waiting to be processed."
-    );
     pub static ref BEACON_PROCESSOR_UNAGGREGATED_ATTESTATION_VERIFIED_TOTAL: Result<IntCounter> = try_create_int_counter(
         "beacon_processor_unaggregated_attestation_verified_total",
         "Total number of unaggregated attestations verified for gossip."
@@ -210,10 +139,6 @@ lazy_static! {
         "Total number of unaggregated attestations that referenced an unknown block and were re-queued."
     );
     // Aggregated attestations.
-    pub static ref BEACON_PROCESSOR_AGGREGATED_ATTESTATION_QUEUE_TOTAL: Result<IntGauge> = try_create_int_gauge(
-        "beacon_processor_aggregated_attestation_queue_total",
-        "Count of agg. attestations waiting to be processed."
-    );
     pub static ref BEACON_PROCESSOR_AGGREGATED_ATTESTATION_VERIFIED_TOTAL: Result<IntCounter> = try_create_int_counter(
         "beacon_processor_aggregated_attestation_verified_total",
         "Total number of aggregated attestations verified for gossip."
@@ -227,10 +152,6 @@ lazy_static! {
         "Total number of aggregated attestations that referenced an unknown block and were re-queued."
     );
     // Sync committee messages.
-    pub static ref BEACON_PROCESSOR_SYNC_MESSAGE_QUEUE_TOTAL: Result<IntGauge> = try_create_int_gauge(
-        "beacon_processor_sync_message_queue_total",
-        "Count of sync committee messages waiting to be processed."
-    );
     pub static ref BEACON_PROCESSOR_SYNC_MESSAGE_VERIFIED_TOTAL: Result<IntCounter> = try_create_int_counter(
         "beacon_processor_sync_message_verified_total",
         "Total number of sync committee messages verified for gossip."
@@ -240,10 +161,6 @@ lazy_static! {
         "Total number of sync committee messages imported to fork choice, etc."
     );
     // Sync contribution.
-    pub static ref BEACON_PROCESSOR_SYNC_CONTRIBUTION_QUEUE_TOTAL: Result<IntGauge> = try_create_int_gauge(
-        "beacon_processor_sync_contribution_queue_total",
-        "Count of sync committee contributions waiting to be processed."
-    );
     pub static ref BEACON_PROCESSOR_SYNC_CONTRIBUTION_VERIFIED_TOTAL: Result<IntCounter> = try_create_int_counter(
         "beacon_processor_sync_contribution_verified_total",
         "Total number of sync committee contributions verified for gossip."
@@ -279,12 +196,6 @@ lazy_static! {
             "Gossipsub light_client_optimistic_update errors per error type",
             &["type"]
         );
-    pub static ref BEACON_PROCESSOR_SEND_ERROR_PER_WORK_TYPE: Result<IntCounterVec> =
-        try_create_int_counter_vec(
-            "beacon_processor_send_error_per_work_type",
-            "Total number of beacon processor send error per work type",
-            &["type"]
-        );
 
 
     /*
@@ -371,35 +282,9 @@ lazy_static! {
         "Count of times when a gossip block arrived from the network later than the attestation deadline.",
     );
 
-    /*
-     * Attestation reprocessing queue metrics.
-     */
-    pub static ref BEACON_PROCESSOR_REPROCESSING_QUEUE_TOTAL: Result<IntGaugeVec> =
-        try_create_int_gauge_vec(
-        "beacon_processor_reprocessing_queue_total",
-        "Count of items in a reprocessing queue.",
-        &["type"]
-    );
-    pub static ref BEACON_PROCESSOR_REPROCESSING_QUEUE_EXPIRED_ATTESTATIONS: Result<IntCounter> = try_create_int_counter(
-        "beacon_processor_reprocessing_queue_expired_attestations",
-        "Number of queued attestations which have expired before a matching block has been found."
-    );
-    pub static ref BEACON_PROCESSOR_REPROCESSING_QUEUE_MATCHED_ATTESTATIONS: Result<IntCounter> = try_create_int_counter(
-        "beacon_processor_reprocessing_queue_matched_attestations",
-        "Number of queued attestations where as matching block has been imported."
-    );
-
     /*
      * Light client update reprocessing queue metrics.
      */
-    pub static ref BEACON_PROCESSOR_REPROCESSING_QUEUE_EXPIRED_OPTIMISTIC_UPDATES: Result<IntCounter> = try_create_int_counter(
-        "beacon_processor_reprocessing_queue_expired_optimistic_updates",
-        "Number of queued light client optimistic updates which have expired before a matching block has been found."
-    );
-    pub static ref BEACON_PROCESSOR_REPROCESSING_QUEUE_MATCHED_OPTIMISTIC_UPDATES: Result<IntCounter> = try_create_int_counter(
-        "beacon_processor_reprocessing_queue_matched_optimistic_updates",
-        "Number of queued light client optimistic updates where as matching block has been imported."
-    );
     pub static ref BEACON_PROCESSOR_REPROCESSING_QUEUE_SENT_OPTIMISTIC_UPDATES: Result<IntCounter> = try_create_int_counter(
         "beacon_processor_reprocessing_queue_sent_optimistic_updates",
         "Number of queued light client optimistic updates where as matching block has been imported."
diff --git a/beacon_node/network/src/beacon_processor/worker/gossip_methods.rs b/beacon_node/network/src/network_beacon_processor/gossip_methods.rs
similarity index 95%
rename from beacon_node/network/src/beacon_processor/worker/gossip_methods.rs
rename to beacon_node/network/src/network_beacon_processor/gossip_methods.rs
index 91ec81b18d..ac7479db01 100644
--- a/beacon_node/network/src/beacon_processor/worker/gossip_methods.rs
+++ b/beacon_node/network/src/network_beacon_processor/gossip_methods.rs
@@ -1,4 +1,9 @@
-use crate::{metrics, service::NetworkMessage, sync::SyncMessage};
+use crate::{
+    metrics,
+    network_beacon_processor::{InvalidBlockStorage, NetworkBeaconProcessor},
+    service::NetworkMessage,
+    sync::SyncMessage,
+};
 
 use beacon_chain::store::Error;
 use beacon_chain::{
@@ -30,14 +35,13 @@ use types::{
     SyncCommitteeMessage, SyncSubnetId,
 };
 
-use super::{
-    super::work_reprocessing_queue::{
+use beacon_processor::{
+    work_reprocessing_queue::{
         QueuedAggregate, QueuedGossipBlock, QueuedLightClientUpdate, QueuedUnaggregate,
         ReprocessQueueMessage,
     },
-    Worker,
+    DuplicateCache, GossipAggregatePackage, GossipAttestationPackage,
 };
-use crate::beacon_processor::{DuplicateCache, InvalidBlockStorage};
 
 /// Set to `true` to introduce stricter penalties for peers who send some types of late consensus
 /// messages.
@@ -144,65 +148,7 @@ impl<T: EthSpec> FailedAtt<T> {
     }
 }
 
-/// Items required to verify a batch of unaggregated gossip attestations.
-#[derive(Debug)]
-pub struct GossipAttestationPackage<E: EthSpec> {
-    message_id: MessageId,
-    peer_id: PeerId,
-    attestation: Box<Attestation<E>>,
-    subnet_id: SubnetId,
-    should_import: bool,
-    seen_timestamp: Duration,
-}
-
-impl<E: EthSpec> GossipAttestationPackage<E> {
-    pub fn new(
-        message_id: MessageId,
-        peer_id: PeerId,
-        attestation: Box<Attestation<E>>,
-        subnet_id: SubnetId,
-        should_import: bool,
-        seen_timestamp: Duration,
-    ) -> Self {
-        Self {
-            message_id,
-            peer_id,
-            attestation,
-            subnet_id,
-            should_import,
-            seen_timestamp,
-        }
-    }
-}
-
-/// Items required to verify a batch of aggregated gossip attestations.
-#[derive(Debug)]
-pub struct GossipAggregatePackage<E: EthSpec> {
-    message_id: MessageId,
-    peer_id: PeerId,
-    aggregate: Box<SignedAggregateAndProof<E>>,
-    beacon_block_root: Hash256,
-    seen_timestamp: Duration,
-}
-
-impl<E: EthSpec> GossipAggregatePackage<E> {
-    pub fn new(
-        message_id: MessageId,
-        peer_id: PeerId,
-        aggregate: Box<SignedAggregateAndProof<E>>,
-        seen_timestamp: Duration,
-    ) -> Self {
-        Self {
-            message_id,
-            peer_id,
-            beacon_block_root: aggregate.message.aggregate.data.beacon_block_root,
-            aggregate,
-            seen_timestamp,
-        }
-    }
-}
-
-impl<T: BeaconChainTypes> Worker<T> {
+impl<T: BeaconChainTypes> NetworkBeaconProcessor<T> {
     /* Auxiliary functions */
 
     /// Penalizes a peer for misbehaviour.
@@ -245,13 +191,13 @@ impl<T: BeaconChainTypes> Worker<T> {
     /// Raises a log if there are errors.
     #[allow(clippy::too_many_arguments)]
     pub fn process_gossip_attestation(
-        self,
+        self: Arc<Self>,
         message_id: MessageId,
         peer_id: PeerId,
         attestation: Box<Attestation<T::EthSpec>>,
         subnet_id: SubnetId,
         should_import: bool,
-        reprocess_tx: Option<mpsc::Sender<ReprocessQueueMessage<T>>>,
+        reprocess_tx: Option<mpsc::Sender<ReprocessQueueMessage>>,
         seen_timestamp: Duration,
     ) {
         let result = match self
@@ -277,9 +223,9 @@ impl<T: BeaconChainTypes> Worker<T> {
     }
 
     pub fn process_gossip_attestation_batch(
-        self,
+        self: Arc<Self>,
         packages: Vec<GossipAttestationPackage<T::EthSpec>>,
-        reprocess_tx: Option<mpsc::Sender<ReprocessQueueMessage<T>>>,
+        reprocess_tx: Option<mpsc::Sender<ReprocessQueueMessage>>,
     ) {
         let attestations_and_subnets = packages
             .iter()
@@ -348,12 +294,12 @@ impl<T: BeaconChainTypes> Worker<T> {
     // cant' be mixed-up) and creating a struct would result in more complexity.
     #[allow(clippy::too_many_arguments)]
     fn process_gossip_attestation_result(
-        &self,
+        self: &Arc<Self>,
         result: Result<VerifiedUnaggregate<T>, RejectedUnaggregate<T::EthSpec>>,
         message_id: MessageId,
         peer_id: PeerId,
         subnet_id: SubnetId,
-        reprocess_tx: Option<mpsc::Sender<ReprocessQueueMessage<T>>>,
+        reprocess_tx: Option<mpsc::Sender<ReprocessQueueMessage>>,
         should_import: bool,
         seen_timestamp: Duration,
     ) {
@@ -456,11 +402,11 @@ impl<T: BeaconChainTypes> Worker<T> {
     ///
     /// Raises a log if there are errors.
     pub fn process_gossip_aggregate(
-        self,
+        self: Arc<Self>,
         message_id: MessageId,
         peer_id: PeerId,
         aggregate: Box<SignedAggregateAndProof<T::EthSpec>>,
-        reprocess_tx: Option<mpsc::Sender<ReprocessQueueMessage<T>>>,
+        reprocess_tx: Option<mpsc::Sender<ReprocessQueueMessage>>,
         seen_timestamp: Duration,
     ) {
         let beacon_block_root = aggregate.message.aggregate.data.beacon_block_root;
@@ -490,9 +436,9 @@ impl<T: BeaconChainTypes> Worker<T> {
     }
 
     pub fn process_gossip_aggregate_batch(
-        self,
+        self: Arc<Self>,
         packages: Vec<GossipAggregatePackage<T::EthSpec>>,
-        reprocess_tx: Option<mpsc::Sender<ReprocessQueueMessage<T>>>,
+        reprocess_tx: Option<mpsc::Sender<ReprocessQueueMessage>>,
     ) {
         let aggregates = packages.iter().map(|package| package.aggregate.as_ref());
 
@@ -555,12 +501,12 @@ impl<T: BeaconChainTypes> Worker<T> {
     }
 
     fn process_gossip_aggregate_result(
-        &self,
+        self: &Arc<Self>,
         result: Result<VerifiedAggregate<T>, RejectedAggregate<T::EthSpec>>,
         beacon_block_root: Hash256,
         message_id: MessageId,
         peer_id: PeerId,
-        reprocess_tx: Option<mpsc::Sender<ReprocessQueueMessage<T>>>,
+        reprocess_tx: Option<mpsc::Sender<ReprocessQueueMessage>>,
         seen_timestamp: Duration,
     ) {
         match result {
@@ -659,12 +605,12 @@ impl<T: BeaconChainTypes> Worker<T> {
     /// Raises a log if there are errors.
     #[allow(clippy::too_many_arguments)]
     pub async fn process_gossip_block(
-        self,
+        self: Arc<Self>,
         message_id: MessageId,
         peer_id: PeerId,
         peer_client: Client,
         block: Arc<SignedBeaconBlock<T::EthSpec>>,
-        reprocess_tx: mpsc::Sender<ReprocessQueueMessage<T>>,
+        reprocess_tx: mpsc::Sender<ReprocessQueueMessage>,
         duplicate_cache: DuplicateCache,
         invalid_block_storage: InvalidBlockStorage,
         seen_duration: Duration,
@@ -708,12 +654,12 @@ impl<T: BeaconChainTypes> Worker<T> {
     ///
     /// Returns the `GossipVerifiedBlock` if verification passes and raises a log if there are errors.
     pub async fn process_gossip_unverified_block(
-        &self,
+        self: &Arc<Self>,
         message_id: MessageId,
         peer_id: PeerId,
         peer_client: Client,
         block: Arc<SignedBeaconBlock<T::EthSpec>>,
-        reprocess_tx: mpsc::Sender<ReprocessQueueMessage<T>>,
+        reprocess_tx: mpsc::Sender<ReprocessQueueMessage>,
         seen_duration: Duration,
     ) -> Option<GossipVerifiedBlock<T>> {
         let block_delay =
@@ -911,11 +857,25 @@ impl<T: BeaconChainTypes> Worker<T> {
 
                 metrics::inc_counter(&metrics::BEACON_PROCESSOR_GOSSIP_BLOCK_REQUEUED_TOTAL);
 
+                let inner_self = self.clone();
+                let process_fn = Box::pin(async move {
+                    let reprocess_tx = inner_self.reprocess_tx.clone();
+                    let invalid_block_storage = inner_self.invalid_block_storage.clone();
+                    inner_self
+                        .process_gossip_verified_block(
+                            peer_id,
+                            verified_block,
+                            reprocess_tx,
+                            invalid_block_storage,
+                            seen_duration,
+                        )
+                        .await;
+                });
                 if reprocess_tx
                     .try_send(ReprocessQueueMessage::EarlyBlock(QueuedGossipBlock {
-                        peer_id,
-                        block: Box::new(verified_block),
-                        seen_timestamp: seen_duration,
+                        beacon_block_slot: block_slot,
+                        beacon_block_root: block_root,
+                        process_fn,
                     }))
                     .is_err()
                 {
@@ -948,10 +908,10 @@ impl<T: BeaconChainTypes> Worker<T> {
     ///
     /// Raises a log if there are errors.
     pub async fn process_gossip_verified_block(
-        self,
+        self: Arc<Self>,
         peer_id: PeerId,
         verified_block: GossipVerifiedBlock<T>,
-        reprocess_tx: mpsc::Sender<ReprocessQueueMessage<T>>,
+        reprocess_tx: mpsc::Sender<ReprocessQueueMessage>,
         invalid_block_storage: InvalidBlockStorage,
         // This value is not used presently, but it might come in handy for debugging.
         _seen_duration: Duration,
@@ -1051,7 +1011,7 @@ impl<T: BeaconChainTypes> Worker<T> {
     }
 
     pub fn process_gossip_voluntary_exit(
-        self,
+        self: &Arc<Self>,
         message_id: MessageId,
         peer_id: PeerId,
         voluntary_exit: SignedVoluntaryExit,
@@ -1109,7 +1069,7 @@ impl<T: BeaconChainTypes> Worker<T> {
     }
 
     pub fn process_gossip_proposer_slashing(
-        self,
+        self: &Arc<Self>,
         message_id: MessageId,
         peer_id: PeerId,
         proposer_slashing: ProposerSlashing,
@@ -1171,7 +1131,7 @@ impl<T: BeaconChainTypes> Worker<T> {
     }
 
     pub fn process_gossip_attester_slashing(
-        self,
+        self: &Arc<Self>,
         message_id: MessageId,
         peer_id: PeerId,
         attester_slashing: AttesterSlashing<T::EthSpec>,
@@ -1225,7 +1185,7 @@ impl<T: BeaconChainTypes> Worker<T> {
     }
 
     pub fn process_gossip_bls_to_execution_change(
-        self,
+        self: &Arc<Self>,
         message_id: MessageId,
         peer_id: PeerId,
         bls_to_execution_change: SignedBlsToExecutionChange,
@@ -1308,7 +1268,7 @@ impl<T: BeaconChainTypes> Worker<T> {
     ///
     /// Raises a log if there are errors.
     pub fn process_gossip_sync_committee_signature(
-        self,
+        self: &Arc<Self>,
         message_id: MessageId,
         peer_id: PeerId,
         sync_signature: SyncCommitteeMessage,
@@ -1371,7 +1331,7 @@ impl<T: BeaconChainTypes> Worker<T> {
     ///
     /// Raises a log if there are errors.
     pub fn process_sync_committee_contribution(
-        self,
+        self: &Arc<Self>,
         message_id: MessageId,
         peer_id: PeerId,
         sync_contribution: SignedContributionAndProof<T::EthSpec>,
@@ -1426,7 +1386,7 @@ impl<T: BeaconChainTypes> Worker<T> {
     }
 
     pub fn process_gossip_finality_update(
-        self,
+        self: &Arc<Self>,
         message_id: MessageId,
         peer_id: PeerId,
         light_client_finality_update: LightClientFinalityUpdate<T::EthSpec>,
@@ -1492,11 +1452,11 @@ impl<T: BeaconChainTypes> Worker<T> {
     }
 
     pub fn process_gossip_optimistic_update(
-        self,
+        self: &Arc<Self>,
         message_id: MessageId,
         peer_id: PeerId,
         light_client_optimistic_update: LightClientOptimisticUpdate<T::EthSpec>,
-        reprocess_tx: Option<mpsc::Sender<ReprocessQueueMessage<T>>>,
+        reprocess_tx: Option<mpsc::Sender<ReprocessQueueMessage>>,
         seen_timestamp: Duration,
     ) {
         match self.chain.verify_optimistic_update_for_gossip(
@@ -1527,15 +1487,19 @@ impl<T: BeaconChainTypes> Worker<T> {
                         );
 
                         if let Some(sender) = reprocess_tx {
+                            let processor = self.clone();
                             let msg = ReprocessQueueMessage::UnknownLightClientOptimisticUpdate(
                                 QueuedLightClientUpdate {
-                                    peer_id,
-                                    message_id,
-                                    light_client_optimistic_update: Box::new(
-                                        light_client_optimistic_update,
-                                    ),
                                     parent_root,
-                                    seen_timestamp,
+                                    process_fn: Box::new(move || {
+                                        processor.process_gossip_optimistic_update(
+                                            message_id,
+                                            peer_id,
+                                            light_client_optimistic_update,
+                                            None, // Do not reprocess this message again.
+                                            seen_timestamp,
+                                        )
+                                    }),
                                 },
                             );
 
@@ -1624,11 +1588,11 @@ impl<T: BeaconChainTypes> Worker<T> {
     /// Handle an error whilst verifying an `Attestation` or `SignedAggregateAndProof` from the
     /// network.
     fn handle_attestation_verification_failure(
-        &self,
+        self: &Arc<Self>,
         peer_id: PeerId,
         message_id: MessageId,
         failed_att: FailedAtt<T::EthSpec>,
-        reprocess_tx: Option<mpsc::Sender<ReprocessQueueMessage<T>>>,
+        reprocess_tx: Option<mpsc::Sender<ReprocessQueueMessage>>,
         error: AttnError,
         seen_timestamp: Duration,
     ) {
@@ -1670,6 +1634,7 @@ impl<T: BeaconChainTypes> Worker<T> {
                     attestation_verification::verify_propagation_slot_range(
                         seen_clock,
                         failed_att.attestation(),
+                        &self.chain.spec,
                     );
 
                 // Only penalize the peer if it would have been invalid at the moment we received
@@ -1860,11 +1825,18 @@ impl<T: BeaconChainTypes> Worker<T> {
                             metrics::inc_counter(
                                 &metrics::BEACON_PROCESSOR_AGGREGATED_ATTESTATION_REQUEUED_TOTAL,
                             );
+                            let processor = self.clone();
                             ReprocessQueueMessage::UnknownBlockAggregate(QueuedAggregate {
-                                peer_id,
-                                message_id,
-                                attestation,
-                                seen_timestamp,
+                                beacon_block_root: *beacon_block_root,
+                                process_fn: Box::new(move || {
+                                    processor.process_gossip_aggregate(
+                                        message_id,
+                                        peer_id,
+                                        attestation,
+                                        None, // Do not allow this attestation to be re-processed beyond this point.
+                                        seen_timestamp,
+                                    )
+                                }),
                             })
                         }
                         FailedAtt::Unaggregate {
@@ -1876,13 +1848,20 @@ impl<T: BeaconChainTypes> Worker<T> {
                             metrics::inc_counter(
                                 &metrics::BEACON_PROCESSOR_UNAGGREGATED_ATTESTATION_REQUEUED_TOTAL,
                             );
+                            let processor = self.clone();
                             ReprocessQueueMessage::UnknownBlockUnaggregate(QueuedUnaggregate {
-                                peer_id,
-                                message_id,
-                                attestation,
-                                subnet_id,
-                                should_import,
-                                seen_timestamp,
+                                beacon_block_root: *beacon_block_root,
+                                process_fn: Box::new(move || {
+                                    processor.process_gossip_attestation(
+                                        message_id,
+                                        peer_id,
+                                        attestation,
+                                        subnet_id,
+                                        should_import,
+                                        None, // Do not allow this attestation to be re-processed beyond this point.
+                                        seen_timestamp,
+                                    )
+                                }),
                             })
                         }
                     };
@@ -2083,7 +2062,7 @@ impl<T: BeaconChainTypes> Worker<T> {
                 );
             }
             AttnError::BeaconChainError(BeaconChainError::DBError(Error::HotColdDBError(
-                HotColdDBError::AttestationStateIsFinalized { .. },
+                HotColdDBError::FinalizedStateNotInHotDatabase { .. },
             ))) => {
                 debug!(self.log, "Attestation for finalized state"; "peer_id" => % peer_id);
                 self.propagate_validation_result(message_id, peer_id, MessageAcceptance::Ignore);
@@ -2204,6 +2183,7 @@ impl<T: BeaconChainTypes> Worker<T> {
                         sync_committee_verification::verify_propagation_slot_range(
                             seen_clock,
                             &sync_committee_message_slot,
+                            &self.chain.spec,
                         );
                     hindsight_verification.is_err()
                 };
@@ -2516,6 +2496,7 @@ impl<T: BeaconChainTypes> Worker<T> {
         let is_timely = attestation_verification::verify_propagation_slot_range(
             &self.chain.slot_clock,
             attestation,
+            &self.chain.spec,
         )
         .is_ok();
 
diff --git a/beacon_node/network/src/network_beacon_processor/mod.rs b/beacon_node/network/src/network_beacon_processor/mod.rs
new file mode 100644
index 0000000000..f8c4e37ffe
--- /dev/null
+++ b/beacon_node/network/src/network_beacon_processor/mod.rs
@@ -0,0 +1,583 @@
+use crate::{
+    service::NetworkMessage,
+    sync::{manager::BlockProcessType, SyncMessage},
+};
+use beacon_chain::{
+    builder::Witness, eth1_chain::CachingEth1Backend, test_utils::BeaconChainHarness, BeaconChain,
+};
+use beacon_chain::{BeaconChainTypes, NotifyExecutionLayer};
+use beacon_processor::{
+    work_reprocessing_queue::ReprocessQueueMessage, BeaconProcessorChannels, BeaconProcessorSend,
+    DuplicateCache, GossipAggregatePackage, GossipAttestationPackage, Work,
+    WorkEvent as BeaconWorkEvent,
+};
+use environment::null_logger;
+use lighthouse_network::{
+    rpc::{BlocksByRangeRequest, BlocksByRootRequest, LightClientBootstrapRequest, StatusMessage},
+    Client, MessageId, NetworkGlobals, PeerId, PeerRequestId,
+};
+use slog::{debug, Logger};
+use slot_clock::ManualSlotClock;
+use std::path::PathBuf;
+use std::sync::Arc;
+use std::time::Duration;
+use store::MemoryStore;
+use task_executor::test_utils::TestRuntime;
+use task_executor::TaskExecutor;
+use tokio::sync::mpsc::{self, error::TrySendError};
+use types::*;
+
+pub use sync_methods::ChainSegmentProcessId;
+
+pub type Error<T> = TrySendError<BeaconWorkEvent<T>>;
+
+mod gossip_methods;
+mod rpc_methods;
+mod sync_methods;
+mod tests;
+
+pub(crate) const FUTURE_SLOT_TOLERANCE: u64 = 1;
+
+/// Defines if and where we will store the SSZ files of invalid blocks.
+#[derive(Clone)]
+pub enum InvalidBlockStorage {
+    Enabled(PathBuf),
+    Disabled,
+}
+
+/// Provides an interface to a `BeaconProcessor` running in some other thread.
+/// The wider `networking` crate should use this struct to interface with the
+/// beacon processor.
+pub struct NetworkBeaconProcessor<T: BeaconChainTypes> {
+    pub beacon_processor_send: BeaconProcessorSend<T::EthSpec>,
+    pub duplicate_cache: DuplicateCache,
+    pub chain: Arc<BeaconChain<T>>,
+    pub network_tx: mpsc::UnboundedSender<NetworkMessage<T::EthSpec>>,
+    pub sync_tx: mpsc::UnboundedSender<SyncMessage<T::EthSpec>>,
+    pub reprocess_tx: mpsc::Sender<ReprocessQueueMessage>,
+    pub network_globals: Arc<NetworkGlobals<T::EthSpec>>,
+    pub invalid_block_storage: InvalidBlockStorage,
+    pub executor: TaskExecutor,
+    pub log: Logger,
+}
+
+impl<T: BeaconChainTypes> NetworkBeaconProcessor<T> {
+    fn try_send(&self, event: BeaconWorkEvent<T::EthSpec>) -> Result<(), Error<T::EthSpec>> {
+        self.beacon_processor_send
+            .try_send(event)
+            .map_err(Into::into)
+    }
+
+    /// Create a new `Work` event for some unaggregated attestation.
+    pub fn send_unaggregated_attestation(
+        self: &Arc<Self>,
+        message_id: MessageId,
+        peer_id: PeerId,
+        attestation: Attestation<T::EthSpec>,
+        subnet_id: SubnetId,
+        should_import: bool,
+        seen_timestamp: Duration,
+    ) -> Result<(), Error<T::EthSpec>> {
+        // Define a closure for processing individual attestations.
+        let processor = self.clone();
+        let process_individual = move |package: GossipAttestationPackage<T::EthSpec>| {
+            let reprocess_tx = processor.reprocess_tx.clone();
+            processor.process_gossip_attestation(
+                package.message_id,
+                package.peer_id,
+                package.attestation,
+                package.subnet_id,
+                package.should_import,
+                Some(reprocess_tx),
+                package.seen_timestamp,
+            )
+        };
+
+        // Define a closure for processing batches of attestations.
+        let processor = self.clone();
+        let process_batch = move |attestations| {
+            let reprocess_tx = processor.reprocess_tx.clone();
+            processor.process_gossip_attestation_batch(attestations, Some(reprocess_tx))
+        };
+
+        self.try_send(BeaconWorkEvent {
+            drop_during_sync: true,
+            work: Work::GossipAttestation {
+                attestation: GossipAttestationPackage {
+                    message_id,
+                    peer_id,
+                    attestation: Box::new(attestation),
+                    subnet_id,
+                    should_import,
+                    seen_timestamp,
+                },
+                process_individual: Box::new(process_individual),
+                process_batch: Box::new(process_batch),
+            },
+        })
+    }
+
+    /// Create a new `Work` event for some aggregated attestation.
+    pub fn send_aggregated_attestation(
+        self: &Arc<Self>,
+        message_id: MessageId,
+        peer_id: PeerId,
+        aggregate: SignedAggregateAndProof<T::EthSpec>,
+        seen_timestamp: Duration,
+    ) -> Result<(), Error<T::EthSpec>> {
+        // Define a closure for processing individual attestations.
+        let processor = self.clone();
+        let process_individual = move |package: GossipAggregatePackage<T::EthSpec>| {
+            let reprocess_tx = processor.reprocess_tx.clone();
+            processor.process_gossip_aggregate(
+                package.message_id,
+                package.peer_id,
+                package.aggregate,
+                Some(reprocess_tx),
+                package.seen_timestamp,
+            )
+        };
+
+        // Define a closure for processing batches of attestations.
+        let processor = self.clone();
+        let process_batch = move |aggregates| {
+            let reprocess_tx = processor.reprocess_tx.clone();
+            processor.process_gossip_aggregate_batch(aggregates, Some(reprocess_tx))
+        };
+
+        let beacon_block_root = aggregate.message.aggregate.data.beacon_block_root;
+        self.try_send(BeaconWorkEvent {
+            drop_during_sync: true,
+            work: Work::GossipAggregate {
+                aggregate: GossipAggregatePackage {
+                    message_id,
+                    peer_id,
+                    aggregate: Box::new(aggregate),
+                    beacon_block_root,
+                    seen_timestamp,
+                },
+                process_individual: Box::new(process_individual),
+                process_batch: Box::new(process_batch),
+            },
+        })
+    }
+
+    /// Create a new `Work` event for some block.
+    pub fn send_gossip_beacon_block(
+        self: &Arc<Self>,
+        message_id: MessageId,
+        peer_id: PeerId,
+        peer_client: Client,
+        block: Arc<SignedBeaconBlock<T::EthSpec>>,
+        seen_timestamp: Duration,
+    ) -> Result<(), Error<T::EthSpec>> {
+        let processor = self.clone();
+        let process_fn = async move {
+            let reprocess_tx = processor.reprocess_tx.clone();
+            let invalid_block_storage = processor.invalid_block_storage.clone();
+            let duplicate_cache = processor.duplicate_cache.clone();
+            processor
+                .process_gossip_block(
+                    message_id,
+                    peer_id,
+                    peer_client,
+                    block,
+                    reprocess_tx,
+                    duplicate_cache,
+                    invalid_block_storage,
+                    seen_timestamp,
+                )
+                .await
+        };
+
+        self.try_send(BeaconWorkEvent {
+            drop_during_sync: false,
+            work: Work::GossipBlock(Box::pin(process_fn)),
+        })
+    }
+
+    /// Create a new `Work` event for some sync committee signature.
+    pub fn send_gossip_sync_signature(
+        self: &Arc<Self>,
+        message_id: MessageId,
+        peer_id: PeerId,
+        sync_signature: SyncCommitteeMessage,
+        subnet_id: SyncSubnetId,
+        seen_timestamp: Duration,
+    ) -> Result<(), Error<T::EthSpec>> {
+        let processor = self.clone();
+        let process_fn = move || {
+            processor.process_gossip_sync_committee_signature(
+                message_id,
+                peer_id,
+                sync_signature,
+                subnet_id,
+                seen_timestamp,
+            )
+        };
+
+        self.try_send(BeaconWorkEvent {
+            drop_during_sync: true,
+            work: Work::GossipSyncSignature(Box::new(process_fn)),
+        })
+    }
+
+    /// Create a new `Work` event for some sync committee contribution.
+    pub fn send_gossip_sync_contribution(
+        self: &Arc<Self>,
+        message_id: MessageId,
+        peer_id: PeerId,
+        sync_contribution: SignedContributionAndProof<T::EthSpec>,
+        seen_timestamp: Duration,
+    ) -> Result<(), Error<T::EthSpec>> {
+        let processor = self.clone();
+        let process_fn = move || {
+            processor.process_sync_committee_contribution(
+                message_id,
+                peer_id,
+                sync_contribution,
+                seen_timestamp,
+            )
+        };
+
+        self.try_send(BeaconWorkEvent {
+            drop_during_sync: true,
+            work: Work::GossipSyncContribution(Box::new(process_fn)),
+        })
+    }
+
+    /// Create a new `Work` event for some exit.
+    pub fn send_gossip_voluntary_exit(
+        self: &Arc<Self>,
+        message_id: MessageId,
+        peer_id: PeerId,
+        voluntary_exit: Box<SignedVoluntaryExit>,
+    ) -> Result<(), Error<T::EthSpec>> {
+        let processor = self.clone();
+        let process_fn =
+            move || processor.process_gossip_voluntary_exit(message_id, peer_id, *voluntary_exit);
+
+        self.try_send(BeaconWorkEvent {
+            drop_during_sync: false,
+            work: Work::GossipVoluntaryExit(Box::new(process_fn)),
+        })
+    }
+
+    /// Create a new `Work` event for some proposer slashing.
+    pub fn send_gossip_proposer_slashing(
+        self: &Arc<Self>,
+        message_id: MessageId,
+        peer_id: PeerId,
+        proposer_slashing: Box<ProposerSlashing>,
+    ) -> Result<(), Error<T::EthSpec>> {
+        let processor = self.clone();
+        let process_fn = move || {
+            processor.process_gossip_proposer_slashing(message_id, peer_id, *proposer_slashing)
+        };
+
+        self.try_send(BeaconWorkEvent {
+            drop_during_sync: false,
+            work: Work::GossipProposerSlashing(Box::new(process_fn)),
+        })
+    }
+
+    /// Create a new `Work` event for some light client finality update.
+    pub fn send_gossip_light_client_finality_update(
+        self: &Arc<Self>,
+        message_id: MessageId,
+        peer_id: PeerId,
+        light_client_finality_update: LightClientFinalityUpdate<T::EthSpec>,
+        seen_timestamp: Duration,
+    ) -> Result<(), Error<T::EthSpec>> {
+        let processor = self.clone();
+        let process_fn = move || {
+            processor.process_gossip_finality_update(
+                message_id,
+                peer_id,
+                light_client_finality_update,
+                seen_timestamp,
+            )
+        };
+
+        self.try_send(BeaconWorkEvent {
+            drop_during_sync: true,
+            work: Work::GossipLightClientFinalityUpdate(Box::new(process_fn)),
+        })
+    }
+
+    /// Create a new `Work` event for some light client optimistic update.
+    pub fn send_gossip_light_client_optimistic_update(
+        self: &Arc<Self>,
+        message_id: MessageId,
+        peer_id: PeerId,
+        light_client_optimistic_update: LightClientOptimisticUpdate<T::EthSpec>,
+        seen_timestamp: Duration,
+    ) -> Result<(), Error<T::EthSpec>> {
+        let processor = self.clone();
+        let process_fn = move || {
+            let reprocess_tx = processor.reprocess_tx.clone();
+            processor.process_gossip_optimistic_update(
+                message_id,
+                peer_id,
+                light_client_optimistic_update,
+                Some(reprocess_tx),
+                seen_timestamp,
+            )
+        };
+
+        self.try_send(BeaconWorkEvent {
+            drop_during_sync: true,
+            work: Work::GossipLightClientOptimisticUpdate(Box::new(process_fn)),
+        })
+    }
+
+    /// Create a new `Work` event for some attester slashing.
+    pub fn send_gossip_attester_slashing(
+        self: &Arc<Self>,
+        message_id: MessageId,
+        peer_id: PeerId,
+        attester_slashing: Box<AttesterSlashing<T::EthSpec>>,
+    ) -> Result<(), Error<T::EthSpec>> {
+        let processor = self.clone();
+        let process_fn = move || {
+            processor.process_gossip_attester_slashing(message_id, peer_id, *attester_slashing)
+        };
+
+        self.try_send(BeaconWorkEvent {
+            drop_during_sync: false,
+            work: Work::GossipAttesterSlashing(Box::new(process_fn)),
+        })
+    }
+
+    /// Create a new `Work` event for some BLS to execution change.
+    pub fn send_gossip_bls_to_execution_change(
+        self: &Arc<Self>,
+        message_id: MessageId,
+        peer_id: PeerId,
+        bls_to_execution_change: Box<SignedBlsToExecutionChange>,
+    ) -> Result<(), Error<T::EthSpec>> {
+        let processor = self.clone();
+        let process_fn = move || {
+            processor.process_gossip_bls_to_execution_change(
+                message_id,
+                peer_id,
+                *bls_to_execution_change,
+            )
+        };
+
+        self.try_send(BeaconWorkEvent {
+            drop_during_sync: false,
+            work: Work::GossipBlsToExecutionChange(Box::new(process_fn)),
+        })
+    }
+
+    /// Create a new `Work` event for some block, where the result from computation (if any) is
+    /// sent to the other side of `result_tx`.
+    pub fn send_rpc_beacon_block(
+        self: &Arc<Self>,
+        block_root: Hash256,
+        block: Arc<SignedBeaconBlock<T::EthSpec>>,
+        seen_timestamp: Duration,
+        process_type: BlockProcessType,
+    ) -> Result<(), Error<T::EthSpec>> {
+        let process_fn = self.clone().generate_rpc_beacon_block_process_fn(
+            block_root,
+            block,
+            seen_timestamp,
+            process_type,
+        );
+        self.try_send(BeaconWorkEvent {
+            drop_during_sync: false,
+            work: Work::RpcBlock { process_fn },
+        })
+    }
+
+    /// Create a new work event to import `blocks` as a beacon chain segment.
+    pub fn send_chain_segment(
+        self: &Arc<Self>,
+        process_id: ChainSegmentProcessId,
+        blocks: Vec<Arc<SignedBeaconBlock<T::EthSpec>>>,
+    ) -> Result<(), Error<T::EthSpec>> {
+        let is_backfill = matches!(&process_id, ChainSegmentProcessId::BackSyncBatchId { .. });
+        let processor = self.clone();
+        let process_fn = async move {
+            let notify_execution_layer = if processor
+                .network_globals
+                .sync_state
+                .read()
+                .is_syncing_finalized()
+            {
+                NotifyExecutionLayer::No
+            } else {
+                NotifyExecutionLayer::Yes
+            };
+            processor
+                .process_chain_segment(process_id, blocks, notify_execution_layer)
+                .await;
+        };
+        let process_fn = Box::pin(process_fn);
+
+        // Back-sync batches are dispatched with a different `Work` variant so
+        // they can be rate-limited.
+        let work = if is_backfill {
+            Work::ChainSegmentBackfill(process_fn)
+        } else {
+            Work::ChainSegment(process_fn)
+        };
+
+        self.try_send(BeaconWorkEvent {
+            drop_during_sync: false,
+            work,
+        })
+    }
+
+    /// Create a new work event to process `StatusMessage`s from the RPC network.
+    pub fn send_status_message(
+        self: &Arc<Self>,
+        peer_id: PeerId,
+        message: StatusMessage,
+    ) -> Result<(), Error<T::EthSpec>> {
+        let processor = self.clone();
+        let process_fn = move || processor.process_status(peer_id, message);
+
+        self.try_send(BeaconWorkEvent {
+            drop_during_sync: false,
+            work: Work::Status(Box::new(process_fn)),
+        })
+    }
+
+    /// Create a new work event to process `BlocksByRangeRequest`s from the RPC network.
+    pub fn send_blocks_by_range_request(
+        self: &Arc<Self>,
+        peer_id: PeerId,
+        request_id: PeerRequestId,
+        request: BlocksByRangeRequest,
+    ) -> Result<(), Error<T::EthSpec>> {
+        let processor = self.clone();
+        let process_fn = move |send_idle_on_drop| {
+            let executor = processor.executor.clone();
+            processor.handle_blocks_by_range_request(
+                executor,
+                send_idle_on_drop,
+                peer_id,
+                request_id,
+                request,
+            )
+        };
+
+        self.try_send(BeaconWorkEvent {
+            drop_during_sync: false,
+            work: Work::BlocksByRangeRequest(Box::new(process_fn)),
+        })
+    }
+
+    /// Create a new work event to process `BlocksByRootRequest`s from the RPC network.
+    pub fn send_blocks_by_roots_request(
+        self: &Arc<Self>,
+        peer_id: PeerId,
+        request_id: PeerRequestId,
+        request: BlocksByRootRequest,
+    ) -> Result<(), Error<T::EthSpec>> {
+        let processor = self.clone();
+        let process_fn = move |send_idle_on_drop| {
+            let executor = processor.executor.clone();
+            processor.handle_blocks_by_root_request(
+                executor,
+                send_idle_on_drop,
+                peer_id,
+                request_id,
+                request,
+            )
+        };
+
+        self.try_send(BeaconWorkEvent {
+            drop_during_sync: false,
+            work: Work::BlocksByRootsRequest(Box::new(process_fn)),
+        })
+    }
+
+    /// Create a new work event to process `LightClientBootstrap`s from the RPC network.
+    pub fn send_lightclient_bootstrap_request(
+        self: &Arc<Self>,
+        peer_id: PeerId,
+        request_id: PeerRequestId,
+        request: LightClientBootstrapRequest,
+    ) -> Result<(), Error<T::EthSpec>> {
+        let processor = self.clone();
+        let process_fn =
+            move || processor.handle_light_client_bootstrap(peer_id, request_id, request);
+
+        self.try_send(BeaconWorkEvent {
+            drop_during_sync: true,
+            work: Work::LightClientBootstrapRequest(Box::new(process_fn)),
+        })
+    }
+
+    /// Send a message to `sync_tx`.
+    ///
+    /// Creates a log if there is an internal error.
+    fn send_sync_message(&self, message: SyncMessage<T::EthSpec>) {
+        self.sync_tx.send(message).unwrap_or_else(|e| {
+            debug!(self.log, "Could not send message to the sync service";
+                   "error" => %e)
+        });
+    }
+
+    /// Send a message to `network_tx`.
+    ///
+    /// Creates a log if there is an internal error.
+    fn send_network_message(&self, message: NetworkMessage<T::EthSpec>) {
+        self.network_tx.send(message).unwrap_or_else(|e| {
+            debug!(self.log, "Could not send message to the network service. Likely shutdown";
+                "error" => %e)
+        });
+    }
+}
+
+type TestBeaconChainType<E> =
+    Witness<ManualSlotClock, CachingEth1Backend<E>, E, MemoryStore<E>, MemoryStore<E>>;
+
+impl<E: EthSpec> NetworkBeaconProcessor<TestBeaconChainType<E>> {
+    // Instantiates a mostly non-functional version of `Self` and returns the
+    // event receiver that would normally go to the beacon processor. This is
+    // useful for testing that messages are actually being sent to the beacon
+    // processor (but not much else).
+    pub fn null_for_testing(
+        network_globals: Arc<NetworkGlobals<E>>,
+    ) -> (Self, mpsc::Receiver<BeaconWorkEvent<E>>) {
+        let BeaconProcessorChannels {
+            beacon_processor_tx,
+            beacon_processor_rx,
+            work_reprocessing_tx,
+            work_reprocessing_rx: _work_reprocessing_rx,
+        } = <_>::default();
+
+        let (network_tx, _network_rx) = mpsc::unbounded_channel();
+        let (sync_tx, _sync_rx) = mpsc::unbounded_channel();
+        let log = null_logger().unwrap();
+        let harness: BeaconChainHarness<TestBeaconChainType<E>> =
+            BeaconChainHarness::builder(E::default())
+                .spec(E::default_spec())
+                .deterministic_keypairs(8)
+                .logger(log.clone())
+                .fresh_ephemeral_store()
+                .mock_execution_layer()
+                .build();
+        let runtime = TestRuntime::default();
+
+        let network_beacon_processor = Self {
+            beacon_processor_send: beacon_processor_tx,
+            duplicate_cache: DuplicateCache::default(),
+            chain: harness.chain,
+            network_tx,
+            sync_tx,
+            reprocess_tx: work_reprocessing_tx,
+            network_globals,
+            invalid_block_storage: InvalidBlockStorage::Disabled,
+            executor: runtime.task_executor.clone(),
+            log,
+        };
+
+        (network_beacon_processor, beacon_processor_rx)
+    }
+}
diff --git a/beacon_node/network/src/beacon_processor/worker/rpc_methods.rs b/beacon_node/network/src/network_beacon_processor/rpc_methods.rs
similarity index 98%
rename from beacon_node/network/src/beacon_processor/worker/rpc_methods.rs
rename to beacon_node/network/src/network_beacon_processor/rpc_methods.rs
index 83baa0417b..19b0a60a43 100644
--- a/beacon_node/network/src/beacon_processor/worker/rpc_methods.rs
+++ b/beacon_node/network/src/network_beacon_processor/rpc_methods.rs
@@ -1,21 +1,21 @@
-use crate::beacon_processor::{worker::FUTURE_SLOT_TOLERANCE, SendOnDrop};
+use crate::network_beacon_processor::{NetworkBeaconProcessor, FUTURE_SLOT_TOLERANCE};
 use crate::service::NetworkMessage;
 use crate::status::ToStatusMessage;
 use crate::sync::SyncMessage;
 use beacon_chain::{BeaconChainError, BeaconChainTypes, HistoricalBlockError, WhenSlotSkipped};
+use beacon_processor::SendOnDrop;
 use itertools::process_results;
 use lighthouse_network::rpc::StatusMessage;
 use lighthouse_network::rpc::*;
 use lighthouse_network::{PeerId, PeerRequestId, ReportSource, Response, SyncInfo};
 use slog::{debug, error, warn};
 use slot_clock::SlotClock;
+use std::sync::Arc;
 use task_executor::TaskExecutor;
 use tokio_stream::StreamExt;
 use types::{light_client_bootstrap::LightClientBootstrap, Epoch, EthSpec, Hash256, Slot};
 
-use super::Worker;
-
-impl<T: BeaconChainTypes> Worker<T> {
+impl<T: BeaconChainTypes> NetworkBeaconProcessor<T> {
     /* Auxiliary functions */
 
     /// Disconnects and ban's a peer, sending a Goodbye request with the associated reason.
@@ -124,7 +124,7 @@ impl<T: BeaconChainTypes> Worker<T> {
 
     /// Handle a `BlocksByRoot` request from the peer.
     pub fn handle_blocks_by_root_request(
-        self,
+        self: Arc<Self>,
         executor: TaskExecutor,
         send_on_drop: SendOnDrop,
         peer_id: PeerId,
@@ -210,7 +210,7 @@ impl<T: BeaconChainTypes> Worker<T> {
 
     /// Handle a `BlocksByRoot` request from the peer.
     pub fn handle_light_client_bootstrap(
-        self,
+        self: &Arc<Self>,
         peer_id: PeerId,
         request_id: PeerRequestId,
         request: LightClientBootstrapRequest,
@@ -283,7 +283,7 @@ impl<T: BeaconChainTypes> Worker<T> {
 
     /// Handle a `BlocksByRange` request from the peer.
     pub fn handle_blocks_by_range_request(
-        self,
+        self: Arc<Self>,
         executor: TaskExecutor,
         send_on_drop: SendOnDrop,
         peer_id: PeerId,
diff --git a/beacon_node/network/src/beacon_processor/worker/sync_methods.rs b/beacon_node/network/src/network_beacon_processor/sync_methods.rs
similarity index 90%
rename from beacon_node/network/src/beacon_processor/worker/sync_methods.rs
rename to beacon_node/network/src/network_beacon_processor/sync_methods.rs
index ac59b1daa9..c33e2acf54 100644
--- a/beacon_node/network/src/beacon_processor/worker/sync_methods.rs
+++ b/beacon_node/network/src/network_beacon_processor/sync_methods.rs
@@ -1,17 +1,21 @@
 use std::time::Duration;
 
-use super::{super::work_reprocessing_queue::ReprocessQueueMessage, Worker};
-use crate::beacon_processor::work_reprocessing_queue::QueuedRpcBlock;
-use crate::beacon_processor::worker::FUTURE_SLOT_TOLERANCE;
-use crate::beacon_processor::DuplicateCache;
 use crate::metrics;
-use crate::sync::manager::{BlockProcessType, SyncMessage};
-use crate::sync::{BatchProcessResult, ChainId};
+use crate::network_beacon_processor::{NetworkBeaconProcessor, FUTURE_SLOT_TOLERANCE};
+use crate::sync::BatchProcessResult;
+use crate::sync::{
+    manager::{BlockProcessType, SyncMessage},
+    ChainId,
+};
 use beacon_chain::{
     observed_block_producers::Error as ObserveError, validator_monitor::get_block_delay_ms,
     BeaconChainError, BeaconChainTypes, BlockError, ChainSegmentResult, HistoricalBlockError,
     NotifyExecutionLayer,
 };
+use beacon_processor::{
+    work_reprocessing_queue::{QueuedRpcBlock, ReprocessQueueMessage},
+    AsyncFn, BlockingFn, DuplicateCache,
+};
 use lighthouse_network::PeerAction;
 use slog::{debug, error, info, warn};
 use slot_clock::SlotClock;
@@ -39,27 +43,71 @@ struct ChainSegmentFailed {
     peer_action: Option<PeerAction>,
 }
 
-impl<T: BeaconChainTypes> Worker<T> {
-    /// Attempt to process a block received from a direct RPC request.
-    #[allow(clippy::too_many_arguments)]
-    pub async fn process_rpc_block(
-        self,
+impl<T: BeaconChainTypes> NetworkBeaconProcessor<T> {
+    /// Returns an async closure which processes a beacon block recieved via RPC.
+    ///
+    /// This separate function was required to prevent a cycle during compiler
+    /// type checking.
+    pub fn generate_rpc_beacon_block_process_fn(
+        self: Arc<Self>,
         block_root: Hash256,
         block: Arc<SignedBeaconBlock<T::EthSpec>>,
         seen_timestamp: Duration,
         process_type: BlockProcessType,
-        reprocess_tx: mpsc::Sender<ReprocessQueueMessage<T>>,
-        duplicate_cache: DuplicateCache,
-        should_process: bool,
-    ) {
-        if !should_process {
+    ) -> AsyncFn {
+        let process_fn = async move {
+            let reprocess_tx = self.reprocess_tx.clone();
+            let duplicate_cache = self.duplicate_cache.clone();
+            self.process_rpc_block(
+                block_root,
+                block,
+                seen_timestamp,
+                process_type,
+                reprocess_tx,
+                duplicate_cache,
+            )
+            .await;
+        };
+        Box::pin(process_fn)
+    }
+
+    /// Returns the `process_fn` and `ignore_fn` required when requeuing an RPC block.
+    pub fn generate_rpc_beacon_block_fns(
+        self: Arc<Self>,
+        block_root: Hash256,
+        block: Arc<SignedBeaconBlock<T::EthSpec>>,
+        seen_timestamp: Duration,
+        process_type: BlockProcessType,
+    ) -> (AsyncFn, BlockingFn) {
+        // An async closure which will import the block.
+        let process_fn = self.clone().generate_rpc_beacon_block_process_fn(
+            block_root,
+            block,
+            seen_timestamp,
+            process_type.clone(),
+        );
+        // A closure which will ignore the block.
+        let ignore_fn = move || {
             // Sync handles these results
             self.send_sync_message(SyncMessage::BlockProcessed {
                 process_type,
                 result: crate::sync::manager::BlockProcessResult::Ignored,
             });
-            return;
-        }
+        };
+        (process_fn, Box::new(ignore_fn))
+    }
+
+    /// Attempt to process a block received from a direct RPC request.
+    #[allow(clippy::too_many_arguments)]
+    pub async fn process_rpc_block(
+        self: Arc<NetworkBeaconProcessor<T>>,
+        block_root: Hash256,
+        block: Arc<SignedBeaconBlock<T::EthSpec>>,
+        seen_timestamp: Duration,
+        process_type: BlockProcessType,
+        reprocess_tx: mpsc::Sender<ReprocessQueueMessage>,
+        duplicate_cache: DuplicateCache,
+    ) {
         // Check if the block is already being imported through another source
         let handle = match duplicate_cache.check_and_insert(block_root) {
             Some(handle) => handle,
@@ -70,13 +118,18 @@ impl<T: BeaconChainTypes> Worker<T> {
                     "action" => "sending rpc block to reprocessing queue",
                     "block_root" => %block_root,
                 );
+
                 // Send message to work reprocess queue to retry the block
-                let reprocess_msg = ReprocessQueueMessage::RpcBlock(QueuedRpcBlock {
+                let (process_fn, ignore_fn) = self.clone().generate_rpc_beacon_block_fns(
                     block_root,
-                    block: block.clone(),
-                    process_type,
+                    block,
                     seen_timestamp,
-                    should_process: true,
+                    process_type,
+                );
+                let reprocess_msg = ReprocessQueueMessage::RpcBlock(QueuedRpcBlock {
+                    beacon_block_root: block_root,
+                    process_fn,
+                    ignore_fn,
                 });
 
                 if reprocess_tx.try_send(reprocess_msg).is_err() {
@@ -130,12 +183,16 @@ impl<T: BeaconChainTypes> Worker<T> {
             );
 
             // Send message to work reprocess queue to retry the block
-            let reprocess_msg = ReprocessQueueMessage::RpcBlock(QueuedRpcBlock {
+            let (process_fn, ignore_fn) = self.clone().generate_rpc_beacon_block_fns(
                 block_root,
-                block: block.clone(),
-                process_type,
+                block,
                 seen_timestamp,
-                should_process: true,
+                process_type,
+            );
+            let reprocess_msg = ReprocessQueueMessage::RpcBlock(QueuedRpcBlock {
+                beacon_block_root: block_root,
+                process_fn,
+                ignore_fn,
             });
 
             if reprocess_tx.try_send(reprocess_msg).is_err() {
diff --git a/beacon_node/network/src/beacon_processor/tests.rs b/beacon_node/network/src/network_beacon_processor/tests.rs
similarity index 86%
rename from beacon_node/network/src/beacon_processor/tests.rs
rename to beacon_node/network/src/network_beacon_processor/tests.rs
index b93e83ad78..a678edbf1f 100644
--- a/beacon_node/network/src/beacon_processor/tests.rs
+++ b/beacon_node/network/src/network_beacon_processor/tests.rs
@@ -1,30 +1,32 @@
 #![cfg(not(debug_assertions))] // Tests are too slow in debug.
 #![cfg(test)]
 
-use crate::beacon_processor::work_reprocessing_queue::{
-    QUEUED_ATTESTATION_DELAY, QUEUED_RPC_BLOCK_DELAY,
+use crate::{
+    network_beacon_processor::{
+        ChainSegmentProcessId, DuplicateCache, InvalidBlockStorage, NetworkBeaconProcessor,
+    },
+    service::NetworkMessage,
+    sync::{manager::BlockProcessType, SyncMessage},
 };
-use crate::beacon_processor::*;
-use crate::{service::NetworkMessage, sync::SyncMessage};
 use beacon_chain::test_utils::{
     AttestationStrategy, BeaconChainHarness, BlockStrategy, EphemeralHarnessType,
 };
-use beacon_chain::{BeaconChain, ChainConfig, MAXIMUM_GOSSIP_CLOCK_DISPARITY};
+use beacon_chain::BeaconChain;
+use beacon_processor::{work_reprocessing_queue::*, *};
 use lighthouse_network::{
     discv5::enr::{CombinedKey, EnrBuilder},
     rpc::methods::{MetaData, MetaDataV2},
     types::{EnrAttestationBitfield, EnrSyncCommitteeBitfield},
-    MessageId, NetworkGlobals, PeerId,
+    Client, MessageId, NetworkGlobals, PeerId,
 };
 use slot_clock::SlotClock;
-use std::cmp;
 use std::iter::Iterator;
 use std::sync::Arc;
 use std::time::Duration;
 use tokio::sync::mpsc;
 use types::{
-    Attestation, AttesterSlashing, Epoch, EthSpec, MainnetEthSpec, ProposerSlashing,
-    SignedBeaconBlock, SignedVoluntaryExit, SubnetId,
+    Attestation, AttesterSlashing, Epoch, EthSpec, Hash256, MainnetEthSpec, ProposerSlashing,
+    SignedAggregateAndProof, SignedBeaconBlock, SignedVoluntaryExit, SubnetId,
 };
 
 type E = MainnetEthSpec;
@@ -51,11 +53,12 @@ struct TestRig {
     attester_slashing: AttesterSlashing<E>,
     proposer_slashing: ProposerSlashing,
     voluntary_exit: SignedVoluntaryExit,
-    beacon_processor_tx: mpsc::Sender<WorkEvent<T>>,
+    beacon_processor_tx: BeaconProcessorSend<E>,
     work_journal_rx: mpsc::Receiver<&'static str>,
     _network_rx: mpsc::UnboundedReceiver<NetworkMessage<E>>,
     _sync_rx: mpsc::UnboundedReceiver<SyncMessage<E>>,
     duplicate_cache: DuplicateCache,
+    network_beacon_processor: Arc<NetworkBeaconProcessor<T>>,
     _harness: BeaconChainHarness<T>,
 }
 
@@ -64,16 +67,21 @@ struct TestRig {
 impl Drop for TestRig {
     fn drop(&mut self) {
         // Causes the beacon processor to shutdown.
-        self.beacon_processor_tx = mpsc::channel(MAX_WORK_EVENT_QUEUE_LEN).0;
+        let len = BeaconProcessorConfig::default().max_work_event_queue_len;
+        self.beacon_processor_tx = BeaconProcessorSend(mpsc::channel(len).0);
     }
 }
 
 impl TestRig {
     pub async fn new(chain_length: u64) -> Self {
-        Self::new_with_chain_config(chain_length, ChainConfig::default()).await
+        Self::new_parametric(
+            chain_length,
+            BeaconProcessorConfig::default().enable_backfill_rate_limiting,
+        )
+        .await
     }
 
-    pub async fn new_with_chain_config(chain_length: u64, chain_config: ChainConfig) -> Self {
+    pub async fn new_parametric(chain_length: u64, enable_backfill_rate_limiting: bool) -> Self {
         // This allows for testing voluntary exits without building out a massive chain.
         let mut spec = E::default_spec();
         spec.shard_committee_period = 2;
@@ -82,7 +90,7 @@ impl TestRig {
             .spec(spec)
             .deterministic_keypairs(VALIDATOR_COUNT)
             .fresh_ephemeral_store()
-            .chain_config(chain_config)
+            .chain_config(<_>::default())
             .build();
 
         harness.advance_slot();
@@ -168,7 +176,15 @@ impl TestRig {
 
         let log = harness.logger().clone();
 
-        let (beacon_processor_tx, beacon_processor_rx) = mpsc::channel(MAX_WORK_EVENT_QUEUE_LEN);
+        let mut beacon_processor_config = BeaconProcessorConfig::default();
+        beacon_processor_config.enable_backfill_rate_limiting = enable_backfill_rate_limiting;
+        let BeaconProcessorChannels {
+            beacon_processor_tx,
+            beacon_processor_rx,
+            work_reprocessing_tx,
+            work_reprocessing_rx,
+        } = BeaconProcessorChannels::new(&beacon_processor_config);
+
         let (sync_tx, _sync_rx) = mpsc::unbounded_channel();
 
         // Default metadata
@@ -194,19 +210,37 @@ impl TestRig {
         let (work_journal_tx, work_journal_rx) = mpsc::channel(16_364);
 
         let duplicate_cache = DuplicateCache::default();
-        BeaconProcessor {
-            beacon_chain: Arc::downgrade(&chain),
+        let network_beacon_processor = NetworkBeaconProcessor {
+            beacon_processor_send: beacon_processor_tx.clone(),
+            duplicate_cache: duplicate_cache.clone(),
+            chain: harness.chain.clone(),
             network_tx,
             sync_tx,
+            reprocess_tx: work_reprocessing_tx.clone(),
+            network_globals: network_globals.clone(),
+            invalid_block_storage: InvalidBlockStorage::Disabled,
+            executor: executor.clone(),
+            log: log.clone(),
+        };
+        let network_beacon_processor = Arc::new(network_beacon_processor);
+
+        let beacon_processor = BeaconProcessor {
             network_globals,
             executor,
-            max_workers: cmp::max(1, num_cpus::get()),
             current_workers: 0,
-            importing_blocks: duplicate_cache.clone(),
-            invalid_block_storage: InvalidBlockStorage::Disabled,
+            config: beacon_processor_config,
             log: log.clone(),
         }
-        .spawn_manager(beacon_processor_rx, Some(work_journal_tx));
+        .spawn_manager(
+            beacon_processor_rx,
+            work_reprocessing_tx,
+            work_reprocessing_rx,
+            Some(work_journal_tx),
+            harness.chain.slot_clock.clone(),
+            chain.spec.maximum_gossip_clock_disparity(),
+        );
+
+        assert!(!beacon_processor.is_err());
 
         Self {
             chain,
@@ -222,6 +256,7 @@ impl TestRig {
             _network_rx,
             _sync_rx,
             duplicate_cache,
+            network_beacon_processor,
             _harness: harness,
         }
     }
@@ -235,102 +270,105 @@ impl TestRig {
     }
 
     pub fn enqueue_gossip_block(&self) {
-        self.beacon_processor_tx
-            .try_send(WorkEvent::gossip_beacon_block(
+        self.network_beacon_processor
+            .send_gossip_beacon_block(
                 junk_message_id(),
                 junk_peer_id(),
                 Client::default(),
                 self.next_block.clone(),
                 Duration::from_secs(0),
-            ))
+            )
             .unwrap();
     }
 
     pub fn enqueue_rpc_block(&self) {
-        let event = WorkEvent::rpc_beacon_block(
-            self.next_block.canonical_root(),
-            self.next_block.clone(),
-            std::time::Duration::default(),
-            BlockProcessType::ParentLookup {
-                chain_hash: Hash256::random(),
-            },
-        );
-        self.beacon_processor_tx.try_send(event).unwrap();
+        self.network_beacon_processor
+            .send_rpc_beacon_block(
+                self.next_block.canonical_root(),
+                self.next_block.clone(),
+                std::time::Duration::default(),
+                BlockProcessType::ParentLookup {
+                    chain_hash: Hash256::random(),
+                },
+            )
+            .unwrap();
     }
 
     pub fn enqueue_single_lookup_rpc_block(&self) {
-        let event = WorkEvent::rpc_beacon_block(
-            self.next_block.canonical_root(),
-            self.next_block.clone(),
-            std::time::Duration::default(),
-            BlockProcessType::SingleBlock { id: 1 },
-        );
-        self.beacon_processor_tx.try_send(event).unwrap();
+        self.network_beacon_processor
+            .send_rpc_beacon_block(
+                self.next_block.canonical_root(),
+                self.next_block.clone(),
+                std::time::Duration::default(),
+                BlockProcessType::SingleBlock { id: 1 },
+            )
+            .unwrap();
     }
 
     pub fn enqueue_backfill_batch(&self) {
-        let event = WorkEvent::chain_segment(
-            ChainSegmentProcessId::BackSyncBatchId(Epoch::default()),
-            Vec::default(),
-        );
-        self.beacon_processor_tx.try_send(event).unwrap();
+        self.network_beacon_processor
+            .send_chain_segment(
+                ChainSegmentProcessId::BackSyncBatchId(Epoch::default()),
+                Vec::default(),
+            )
+            .unwrap();
     }
 
     pub fn enqueue_unaggregated_attestation(&self) {
         let (attestation, subnet_id) = self.attestations.first().unwrap().clone();
-        self.beacon_processor_tx
-            .try_send(WorkEvent::unaggregated_attestation(
+        self.network_beacon_processor
+            .send_unaggregated_attestation(
                 junk_message_id(),
                 junk_peer_id(),
                 attestation,
                 subnet_id,
                 true,
                 Duration::from_secs(0),
-            ))
+            )
             .unwrap();
     }
 
     pub fn enqueue_gossip_attester_slashing(&self) {
-        self.beacon_processor_tx
-            .try_send(WorkEvent::gossip_attester_slashing(
+        self.network_beacon_processor
+            .send_gossip_attester_slashing(
                 junk_message_id(),
                 junk_peer_id(),
                 Box::new(self.attester_slashing.clone()),
-            ))
+            )
             .unwrap();
     }
 
     pub fn enqueue_gossip_proposer_slashing(&self) {
-        self.beacon_processor_tx
-            .try_send(WorkEvent::gossip_proposer_slashing(
+        self.network_beacon_processor
+            .send_gossip_proposer_slashing(
                 junk_message_id(),
                 junk_peer_id(),
                 Box::new(self.proposer_slashing.clone()),
-            ))
+            )
             .unwrap();
     }
 
     pub fn enqueue_gossip_voluntary_exit(&self) {
-        self.beacon_processor_tx
-            .try_send(WorkEvent::gossip_voluntary_exit(
+        self.network_beacon_processor
+            .send_gossip_voluntary_exit(
                 junk_message_id(),
                 junk_peer_id(),
                 Box::new(self.voluntary_exit.clone()),
-            ))
+            )
             .unwrap();
     }
 
     pub fn enqueue_next_block_unaggregated_attestation(&self) {
         let (attestation, subnet_id) = self.next_block_attestations.first().unwrap().clone();
-        self.beacon_processor_tx
-            .try_send(WorkEvent::unaggregated_attestation(
+        self.network_beacon_processor
+            .send_unaggregated_attestation(
                 junk_message_id(),
                 junk_peer_id(),
                 attestation,
                 subnet_id,
                 true,
                 Duration::from_secs(0),
-            ))
+            )
             .unwrap();
     }
 
@@ -340,13 +378,13 @@ impl TestRig {
             .first()
             .unwrap()
             .clone();
-        self.beacon_processor_tx
-            .try_send(WorkEvent::aggregated_attestation(
+        self.network_beacon_processor
+            .send_aggregated_attestation(
                 junk_message_id(),
                 junk_peer_id(),
                 aggregate,
                 Duration::from_secs(0),
-            ))
+            )
             .unwrap();
     }
 
@@ -478,7 +516,7 @@ async fn import_gossip_block_acceptably_early() {
 
     rig.chain
         .slot_clock
-        .set_current_time(slot_start - MAXIMUM_GOSSIP_CLOCK_DISPARITY);
+        .set_current_time(slot_start - rig.chain.spec.maximum_gossip_clock_disparity());
 
     assert_eq!(
         rig.chain.slot().unwrap(),
@@ -525,9 +563,9 @@ async fn import_gossip_block_unacceptably_early() {
         .start_of(rig.next_block.slot())
         .unwrap();
 
-    rig.chain
-        .slot_clock
-        .set_current_time(slot_start - MAXIMUM_GOSSIP_CLOCK_DISPARITY - Duration::from_millis(1));
+    rig.chain.slot_clock.set_current_time(
+        slot_start - rig.chain.spec.maximum_gossip_clock_disparity() - Duration::from_millis(1),
+    );
 
     assert_eq!(
         rig.chain.slot().unwrap(),
@@ -913,11 +951,8 @@ async fn test_backfill_sync_processing() {
 /// Ensure that backfill batches get processed as fast as they can when rate-limiting is disabled.
 #[tokio::test]
 async fn test_backfill_sync_processing_rate_limiting_disabled() {
-    let chain_config = ChainConfig {
-        enable_backfill_rate_limiting: false,
-        ..Default::default()
-    };
-    let mut rig = TestRig::new_with_chain_config(SMALL_CHAIN, chain_config).await;
+    let enable_backfill_rate_limiting = false;
+    let mut rig = TestRig::new_parametric(SMALL_CHAIN, enable_backfill_rate_limiting).await;
 
     for _ in 0..3 {
         rig.enqueue_backfill_batch();
diff --git a/beacon_node/network/src/router.rs b/beacon_node/network/src/router.rs
index 7a91f2d0b1..c8332705cf 100644
--- a/beacon_node/network/src/router.rs
+++ b/beacon_node/network/src/router.rs
@@ -5,16 +5,16 @@
 //! syncing-related responses to the Sync manager.
 #![allow(clippy::unit_arg)]
 
-use crate::beacon_processor::{
-    BeaconProcessor, BeaconProcessorSend, InvalidBlockStorage, WorkEvent as BeaconWorkEvent,
-    MAX_WORK_EVENT_QUEUE_LEN,
-};
 use crate::error;
+use crate::network_beacon_processor::{InvalidBlockStorage, NetworkBeaconProcessor};
 use crate::service::{NetworkMessage, RequestId};
 use crate::status::status_message;
 use crate::sync::manager::RequestId as SyncId;
 use crate::sync::SyncMessage;
 use beacon_chain::{BeaconChain, BeaconChainTypes};
+use beacon_processor::{
+    work_reprocessing_queue::ReprocessQueueMessage, BeaconProcessorSend, DuplicateCache,
+};
 use futures::prelude::*;
 use lighthouse_network::rpc::*;
 use lighthouse_network::{
@@ -23,7 +23,6 @@ use lighthouse_network::{
 use logging::TimeLatch;
 use slog::{debug, o, trace};
 use slog::{error, warn};
-use std::cmp;
 use std::sync::Arc;
 use std::time::{Duration, SystemTime, UNIX_EPOCH};
 use tokio::sync::mpsc;
@@ -41,7 +40,7 @@ pub struct Router<T: BeaconChainTypes> {
     /// A network context to return and handle RPC requests.
     network: HandlerNetworkContext<T::EthSpec>,
     /// A multi-threaded, non-blocking processor for applying messages to the beacon chain.
-    beacon_processor_send: BeaconProcessorSend<T>,
+    network_beacon_processor: Arc<NetworkBeaconProcessor<T>>,
     /// The `Router` logger.
     log: slog::Logger,
     /// Provides de-bounce functionality for logging.
@@ -80,12 +79,15 @@ pub enum RouterMessage<T: EthSpec> {
 
 impl<T: BeaconChainTypes> Router<T> {
     /// Initializes and runs the Router.
+    #[allow(clippy::too_many_arguments)]
     pub fn spawn(
         beacon_chain: Arc<BeaconChain<T>>,
         network_globals: Arc<NetworkGlobals<T::EthSpec>>,
         network_send: mpsc::UnboundedSender<NetworkMessage<T::EthSpec>>,
         executor: task_executor::TaskExecutor,
         invalid_block_storage: InvalidBlockStorage,
+        beacon_processor_send: BeaconProcessorSend<T::EthSpec>,
+        beacon_processor_reprocess_tx: mpsc::Sender<ReprocessQueueMessage>,
         log: slog::Logger,
     ) -> error::Result<mpsc::UnboundedSender<RouterMessage<T::EthSpec>>> {
         let message_handler_log = log.new(o!("service"=> "router"));
@@ -93,34 +95,33 @@ impl<T: BeaconChainTypes> Router<T> {
 
         let (handler_send, handler_recv) = mpsc::unbounded_channel();
 
-        let (beacon_processor_send, beacon_processor_receive) =
-            mpsc::channel(MAX_WORK_EVENT_QUEUE_LEN);
-
         let sync_logger = log.new(o!("service"=> "sync"));
+        // generate the message channel
+        let (sync_send, sync_recv) = mpsc::unbounded_channel::<SyncMessage<T::EthSpec>>();
 
-        // spawn the sync thread
-        let sync_send = crate::sync::manager::spawn(
-            executor.clone(),
-            beacon_chain.clone(),
-            network_globals.clone(),
-            network_send.clone(),
-            BeaconProcessorSend(beacon_processor_send.clone()),
-            sync_logger,
-        );
-
-        BeaconProcessor {
-            beacon_chain: Arc::downgrade(&beacon_chain),
+        let network_beacon_processor = NetworkBeaconProcessor {
+            beacon_processor_send,
+            duplicate_cache: DuplicateCache::default(),
+            chain: beacon_chain.clone(),
             network_tx: network_send.clone(),
             sync_tx: sync_send.clone(),
+            reprocess_tx: beacon_processor_reprocess_tx,
             network_globals: network_globals.clone(),
-            executor: executor.clone(),
-            max_workers: cmp::max(1, num_cpus::get()),
-            current_workers: 0,
-            importing_blocks: Default::default(),
             invalid_block_storage,
+            executor: executor.clone(),
             log: log.clone(),
-        }
-        .spawn_manager(beacon_processor_receive, None);
+        };
+        let network_beacon_processor = Arc::new(network_beacon_processor);
+
+        // spawn the sync thread
+        crate::sync::manager::spawn(
+            executor.clone(),
+            beacon_chain.clone(),
+            network_send.clone(),
+            network_beacon_processor.clone(),
+            sync_recv,
+            sync_logger,
+        );
 
         // generate the Message handler
         let mut handler = Router {
@@ -128,7 +129,7 @@ impl<T: BeaconChainTypes> Router<T> {
             chain: beacon_chain,
             sync_send,
             network: HandlerNetworkContext::new(network_send, log.clone()),
-            beacon_processor_send: BeaconProcessorSend(beacon_processor_send),
+            network_beacon_processor,
             log: message_handler_log,
             logger_debounce: TimeLatch::default(),
         };
@@ -197,14 +198,17 @@ impl<T: BeaconChainTypes> Router<T> {
             Request::Status(status_message) => {
                 self.on_status_request(peer_id, request_id, status_message)
             }
-            Request::BlocksByRange(request) => self.send_beacon_processor_work(
-                BeaconWorkEvent::blocks_by_range_request(peer_id, request_id, request),
+            Request::BlocksByRange(request) => self.handle_beacon_processor_send_result(
+                self.network_beacon_processor
+                    .send_blocks_by_range_request(peer_id, request_id, request),
             ),
-            Request::BlocksByRoot(request) => self.send_beacon_processor_work(
-                BeaconWorkEvent::blocks_by_roots_request(peer_id, request_id, request),
+            Request::BlocksByRoot(request) => self.handle_beacon_processor_send_result(
+                self.network_beacon_processor
+                    .send_blocks_by_roots_request(peer_id, request_id, request),
             ),
-            Request::LightClientBootstrap(request) => self.send_beacon_processor_work(
-                BeaconWorkEvent::lightclient_bootstrap_request(peer_id, request_id, request),
+            Request::LightClientBootstrap(request) => self.handle_beacon_processor_send_result(
+                self.network_beacon_processor
+                    .send_lightclient_bootstrap_request(peer_id, request_id, request),
             ),
         }
     }
@@ -219,10 +223,10 @@ impl<T: BeaconChainTypes> Router<T> {
         match response {
             Response::Status(status_message) => {
                 debug!(self.log, "Received Status Response"; "peer_id" => %peer_id, &status_message);
-                self.send_beacon_processor_work(BeaconWorkEvent::status_message(
-                    peer_id,
-                    status_message,
-                ))
+                self.handle_beacon_processor_send_result(
+                    self.network_beacon_processor
+                        .send_status_message(peer_id, status_message),
+                )
             }
             Response::BlocksByRange(beacon_block) => {
                 self.on_blocks_by_range_response(peer_id, request_id, beacon_block);
@@ -247,36 +251,40 @@ impl<T: BeaconChainTypes> Router<T> {
     ) {
         match gossip_message {
             PubsubMessage::AggregateAndProofAttestation(aggregate_and_proof) => self
-                .send_beacon_processor_work(BeaconWorkEvent::aggregated_attestation(
-                    message_id,
-                    peer_id,
-                    *aggregate_and_proof,
-                    timestamp_now(),
-                )),
-            PubsubMessage::Attestation(subnet_attestation) => {
-                self.send_beacon_processor_work(BeaconWorkEvent::unaggregated_attestation(
-                    message_id,
-                    peer_id,
-                    subnet_attestation.1,
-                    subnet_attestation.0,
-                    should_process,
-                    timestamp_now(),
-                ))
-            }
-            PubsubMessage::BeaconBlock(block) => {
-                self.send_beacon_processor_work(BeaconWorkEvent::gossip_beacon_block(
+                .handle_beacon_processor_send_result(
+                    self.network_beacon_processor.send_aggregated_attestation(
+                        message_id,
+                        peer_id,
+                        *aggregate_and_proof,
+                        timestamp_now(),
+                    ),
+                ),
+            PubsubMessage::Attestation(subnet_attestation) => self
+                .handle_beacon_processor_send_result(
+                    self.network_beacon_processor.send_unaggregated_attestation(
+                        message_id,
+                        peer_id,
+                        subnet_attestation.1,
+                        subnet_attestation.0,
+                        should_process,
+                        timestamp_now(),
+                    ),
+                ),
+            PubsubMessage::BeaconBlock(block) => self.handle_beacon_processor_send_result(
+                self.network_beacon_processor.send_gossip_beacon_block(
                     message_id,
                     peer_id,
                     self.network_globals.client(&peer_id),
                     block,
                     timestamp_now(),
-                ))
-            }
+                ),
+            ),
             PubsubMessage::VoluntaryExit(exit) => {
                 debug!(self.log, "Received a voluntary exit"; "peer_id" => %peer_id);
-                self.send_beacon_processor_work(BeaconWorkEvent::gossip_voluntary_exit(
-                    message_id, peer_id, exit,
-                ))
+                self.handle_beacon_processor_send_result(
+                    self.network_beacon_processor
+                        .send_gossip_voluntary_exit(message_id, peer_id, exit),
+                )
             }
             PubsubMessage::ProposerSlashing(proposer_slashing) => {
                 debug!(
@@ -284,11 +292,13 @@ impl<T: BeaconChainTypes> Router<T> {
                     "Received a proposer slashing";
                     "peer_id" => %peer_id
                 );
-                self.send_beacon_processor_work(BeaconWorkEvent::gossip_proposer_slashing(
-                    message_id,
-                    peer_id,
-                    proposer_slashing,
-                ))
+                self.handle_beacon_processor_send_result(
+                    self.network_beacon_processor.send_gossip_proposer_slashing(
+                        message_id,
+                        peer_id,
+                        proposer_slashing,
+                    ),
+                )
             }
             PubsubMessage::AttesterSlashing(attester_slashing) => {
                 debug!(
@@ -296,11 +306,13 @@ impl<T: BeaconChainTypes> Router<T> {
                     "Received a attester slashing";
                     "peer_id" => %peer_id
                 );
-                self.send_beacon_processor_work(BeaconWorkEvent::gossip_attester_slashing(
-                    message_id,
-                    peer_id,
-                    attester_slashing,
-                ))
+                self.handle_beacon_processor_send_result(
+                    self.network_beacon_processor.send_gossip_attester_slashing(
+                        message_id,
+                        peer_id,
+                        attester_slashing,
+                    ),
+                )
             }
             PubsubMessage::SignedContributionAndProof(contribution_and_proof) => {
                 trace!(
@@ -308,12 +320,14 @@ impl<T: BeaconChainTypes> Router<T> {
                     "Received sync committee aggregate";
                     "peer_id" => %peer_id
                 );
-                self.send_beacon_processor_work(BeaconWorkEvent::gossip_sync_contribution(
-                    message_id,
-                    peer_id,
-                    *contribution_and_proof,
-                    timestamp_now(),
-                ))
+                self.handle_beacon_processor_send_result(
+                    self.network_beacon_processor.send_gossip_sync_contribution(
+                        message_id,
+                        peer_id,
+                        *contribution_and_proof,
+                        timestamp_now(),
+                    ),
+                )
             }
             PubsubMessage::SyncCommitteeMessage(sync_committtee_msg) => {
                 trace!(
@@ -321,13 +335,15 @@ impl<T: BeaconChainTypes> Router<T> {
                     "Received sync committee signature";
                     "peer_id" => %peer_id
                 );
-                self.send_beacon_processor_work(BeaconWorkEvent::gossip_sync_signature(
-                    message_id,
-                    peer_id,
-                    sync_committtee_msg.1,
-                    sync_committtee_msg.0,
-                    timestamp_now(),
-                ))
+                self.handle_beacon_processor_send_result(
+                    self.network_beacon_processor.send_gossip_sync_signature(
+                        message_id,
+                        peer_id,
+                        sync_committtee_msg.1,
+                        sync_committtee_msg.0,
+                        timestamp_now(),
+                    ),
+                )
             }
             PubsubMessage::LightClientFinalityUpdate(light_client_finality_update) => {
                 trace!(
@@ -335,13 +351,14 @@ impl<T: BeaconChainTypes> Router<T> {
                     "Received light client finality update";
                     "peer_id" => %peer_id
                 );
-                self.send_beacon_processor_work(
-                    BeaconWorkEvent::gossip_light_client_finality_update(
-                        message_id,
-                        peer_id,
-                        light_client_finality_update,
-                        timestamp_now(),
-                    ),
+                self.handle_beacon_processor_send_result(
+                    self.network_beacon_processor
+                        .send_gossip_light_client_finality_update(
+                            message_id,
+                            peer_id,
+                            *light_client_finality_update,
+                            timestamp_now(),
+                        ),
                 )
             }
             PubsubMessage::LightClientOptimisticUpdate(light_client_optimistic_update) => {
@@ -350,21 +367,25 @@ impl<T: BeaconChainTypes> Router<T> {
                     "Received light client optimistic update";
                     "peer_id" => %peer_id
                 );
-                self.send_beacon_processor_work(
-                    BeaconWorkEvent::gossip_light_client_optimistic_update(
-                        message_id,
-                        peer_id,
-                        light_client_optimistic_update,
-                        timestamp_now(),
-                    ),
+                self.handle_beacon_processor_send_result(
+                    self.network_beacon_processor
+                        .send_gossip_light_client_optimistic_update(
+                            message_id,
+                            peer_id,
+                            *light_client_optimistic_update,
+                            timestamp_now(),
+                        ),
                 )
             }
             PubsubMessage::BlsToExecutionChange(bls_to_execution_change) => self
-                .send_beacon_processor_work(BeaconWorkEvent::gossip_bls_to_execution_change(
-                    message_id,
-                    peer_id,
-                    bls_to_execution_change,
-                )),
+                .handle_beacon_processor_send_result(
+                    self.network_beacon_processor
+                        .send_gossip_bls_to_execution_change(
+                            message_id,
+                            peer_id,
+                            bls_to_execution_change,
+                        ),
+                ),
         }
     }
 
@@ -415,7 +436,10 @@ impl<T: BeaconChainTypes> Router<T> {
             request_id,
         );
 
-        self.send_beacon_processor_work(BeaconWorkEvent::status_message(peer_id, status))
+        self.handle_beacon_processor_send_result(
+            self.network_beacon_processor
+                .send_status_message(peer_id, status),
+        )
     }
 
     /// Handle a `BlocksByRange` response from the peer.
@@ -480,20 +504,22 @@ impl<T: BeaconChainTypes> Router<T> {
         });
     }
 
-    fn send_beacon_processor_work(&mut self, work: BeaconWorkEvent<T>) {
-        self.beacon_processor_send
-            .try_send(work)
-            .unwrap_or_else(|e| {
-                let work_type = match &*e {
-                    mpsc::error::TrySendError::Closed(work)
-                    | mpsc::error::TrySendError::Full(work) => work.work_type(),
-                };
-
-                if self.logger_debounce.elapsed() {
-                    error!(&self.log, "Unable to send message to the beacon processor";
-                        "error" => %e, "type" => work_type)
+    fn handle_beacon_processor_send_result(
+        &mut self,
+        result: Result<(), crate::network_beacon_processor::Error<T::EthSpec>>,
+    ) {
+        if let Err(e) = result {
+            let work_type = match &e {
+                mpsc::error::TrySendError::Closed(work) | mpsc::error::TrySendError::Full(work) => {
+                    work.work_type()
                 }
-            })
+            };
+
+            if self.logger_debounce.elapsed() {
+                error!(&self.log, "Unable to send message to the beacon processor";
+                    "error" => %e, "type" => work_type)
+            }
+        }
     }
 }
 
diff --git a/beacon_node/network/src/service.rs b/beacon_node/network/src/service.rs
index 2c919233fc..c355c671e8 100644
--- a/beacon_node/network/src/service.rs
+++ b/beacon_node/network/src/service.rs
@@ -1,5 +1,5 @@
 use super::sync::manager::RequestId as SyncId;
-use crate::beacon_processor::InvalidBlockStorage;
+use crate::network_beacon_processor::InvalidBlockStorage;
 use crate::persisted_dht::{clear_dht, load_dht, persist_dht};
 use crate::router::{Router, RouterMessage};
 use crate::subnet_service::SyncCommitteeService;
@@ -9,6 +9,7 @@ use crate::{
     NetworkConfig,
 };
 use beacon_chain::{BeaconChain, BeaconChainTypes};
+use beacon_processor::{work_reprocessing_queue::ReprocessQueueMessage, BeaconProcessorSend};
 use futures::channel::mpsc::Sender;
 use futures::future::OptionFuture;
 use futures::prelude::*;
@@ -224,11 +225,19 @@ impl<T: BeaconChainTypes> NetworkService<T> {
         config: &NetworkConfig,
         executor: task_executor::TaskExecutor,
         gossipsub_registry: Option<&'_ mut Registry>,
+        beacon_processor_send: BeaconProcessorSend<T::EthSpec>,
+        beacon_processor_reprocess_tx: mpsc::Sender<ReprocessQueueMessage>,
     ) -> error::Result<(Arc<NetworkGlobals<T::EthSpec>>, NetworkSenders<T::EthSpec>)> {
         let network_log = executor.log().clone();
         // build the channels for external comms
         let (network_senders, network_recievers) = NetworkSenders::new();
 
+        #[cfg(feature = "disable-backfill")]
+        warn!(
+            network_log,
+            "Backfill is disabled. DO NOT RUN IN PRODUCTION"
+        );
+
         // try and construct UPnP port mappings if required.
         if let Some(upnp_config) = crate::nat::UPnPConfig::from_config(config) {
             let upnp_log = network_log.new(o!("service" => "UPnP"));
@@ -311,6 +320,8 @@ impl<T: BeaconChainTypes> NetworkService<T> {
             network_senders.network_send(),
             executor.clone(),
             invalid_block_storage,
+            beacon_processor_send,
+            beacon_processor_reprocess_tx,
             network_log.clone(),
         )?;
 
@@ -482,10 +493,8 @@ impl<T: BeaconChainTypes> NetworkService<T> {
             NetworkEvent::PeerConnectedOutgoing(peer_id) => {
                 self.send_to_router(RouterMessage::StatusPeer(peer_id));
             }
-            NetworkEvent::PeerConnectedIncoming(_)
-            | NetworkEvent::PeerBanned(_)
-            | NetworkEvent::PeerUnbanned(_) => {
-                // No action required for these events.
+            NetworkEvent::PeerConnectedIncoming(_) => {
+                // No action required for this event.
             }
             NetworkEvent::PeerDisconnected(peer_id) => {
                 self.send_to_router(RouterMessage::PeerDisconnected(peer_id));
diff --git a/beacon_node/network/src/service/tests.rs b/beacon_node/network/src/service/tests.rs
index 83fcc8c9ac..67f62ff90d 100644
--- a/beacon_node/network/src/service/tests.rs
+++ b/beacon_node/network/src/service/tests.rs
@@ -4,6 +4,7 @@ mod tests {
     use crate::persisted_dht::load_dht;
     use crate::{NetworkConfig, NetworkService};
     use beacon_chain::test_utils::BeaconChainHarness;
+    use beacon_processor::BeaconProcessorChannels;
     use lighthouse_network::Enr;
     use slog::{o, Drain, Level, Logger};
     use sloggers::{null::NullLoggerBuilder, Build};
@@ -67,10 +68,23 @@ mod tests {
             // Create a new network service which implicitly gets dropped at the
             // end of the block.
 
-            let _network_service =
-                NetworkService::start(beacon_chain.clone(), &config, executor, None)
-                    .await
-                    .unwrap();
+            let BeaconProcessorChannels {
+                beacon_processor_tx,
+                beacon_processor_rx: _beacon_processor_rx,
+                work_reprocessing_tx,
+                work_reprocessing_rx: _work_reprocessing_rx,
+            } = <_>::default();
+
+            let _network_service = NetworkService::start(
+                beacon_chain.clone(),
+                &config,
+                executor,
+                None,
+                beacon_processor_tx,
+                work_reprocessing_tx,
+            )
+            .await
+            .unwrap();
             drop(signal);
         });
 
diff --git a/beacon_node/network/src/subnet_service/attestation_subnets.rs b/beacon_node/network/src/subnet_service/attestation_subnets.rs
index b4f52df39d..1cae6299e1 100644
--- a/beacon_node/network/src/subnet_service/attestation_subnets.rs
+++ b/beacon_node/network/src/subnet_service/attestation_subnets.rs
@@ -302,9 +302,16 @@ impl<T: BeaconChainTypes> AttestationService<T> {
     /// Gets the long lived subnets the node should be subscribed to during the current epoch and
     /// the remaining duration for which they remain valid.
     fn recompute_long_lived_subnets_inner(&mut self) -> Result<Duration, ()> {
-        let current_epoch = self.beacon_chain.epoch().map_err(
-            |e| error!(self.log, "Failed to get the current epoch from clock"; "err" => ?e),
-        )?;
+        let current_epoch = self.beacon_chain.epoch().map_err(|e| {
+            if !self
+                .beacon_chain
+                .slot_clock
+                .is_prior_to_genesis()
+                .unwrap_or(false)
+            {
+                error!(self.log, "Failed to get the current epoch from clock"; "err" => ?e)
+            }
+        })?;
 
         let (subnets, next_subscription_epoch) = SubnetId::compute_subnets_for_epoch::<T::EthSpec>(
             self.node_id.raw().into(),
diff --git a/beacon_node/network/src/sync/backfill_sync/mod.rs b/beacon_node/network/src/sync/backfill_sync/mod.rs
index 460c8b1ee9..a1c2404e5e 100644
--- a/beacon_node/network/src/sync/backfill_sync/mod.rs
+++ b/beacon_node/network/src/sync/backfill_sync/mod.rs
@@ -8,7 +8,7 @@
 //! If a batch fails, the backfill sync cannot progress. In this scenario, we mark the backfill
 //! sync as failed, log an error and attempt to retry once a new peer joins the node.
 
-use crate::beacon_processor::{ChainSegmentProcessId, WorkEvent as BeaconWorkEvent};
+use crate::network_beacon_processor::ChainSegmentProcessId;
 use crate::sync::manager::{BatchProcessResult, Id};
 use crate::sync::network_context::SyncNetworkContext;
 use crate::sync::range_sync::{
@@ -537,8 +537,8 @@ impl<T: BeaconChainTypes> BackFillSync<T> {
         self.current_processing_batch = Some(batch_id);
 
         if let Err(e) = network
-            .processor_channel()
-            .try_send(BeaconWorkEvent::chain_segment(process_id, blocks))
+            .beacon_processor()
+            .send_chain_segment(process_id, blocks)
         {
             crit!(self.log, "Failed to send backfill segment to processor."; "msg" => "process_batch",
                 "error" => %e, "batch" => self.processing_target);
@@ -1098,12 +1098,7 @@ impl<T: BeaconChainTypes> BackFillSync<T> {
         match self.batches.entry(batch_id) {
             Entry::Occupied(_) => {
                 // this batch doesn't need downloading, let this same function decide the next batch
-                if batch_id
-                    == self
-                        .beacon_chain
-                        .genesis_backfill_slot
-                        .epoch(T::EthSpec::slots_per_epoch())
-                {
+                if self.would_complete(batch_id) {
                     self.last_batch_downloaded = true;
                 }
 
@@ -1114,12 +1109,7 @@ impl<T: BeaconChainTypes> BackFillSync<T> {
             }
             Entry::Vacant(entry) => {
                 entry.insert(BatchInfo::new(&batch_id, BACKFILL_EPOCHS_PER_BATCH));
-                if batch_id
-                    == self
-                        .beacon_chain
-                        .genesis_backfill_slot
-                        .epoch(T::EthSpec::slots_per_epoch())
-                {
+                if self.would_complete(batch_id) {
                     self.last_batch_downloaded = true;
                 }
                 self.to_be_downloaded = self
@@ -1151,14 +1141,8 @@ impl<T: BeaconChainTypes> BackFillSync<T> {
 
     /// Checks with the beacon chain if backfill sync has completed.
     fn check_completed(&mut self) -> bool {
-        if self.current_start
-            == self
-                .beacon_chain
-                .genesis_backfill_slot
-                .epoch(T::EthSpec::slots_per_epoch())
-        {
+        if self.would_complete(self.current_start) {
             // Check that the beacon chain agrees
-
             if let Some(anchor_info) = self.beacon_chain.store.get_anchor_info() {
                 // Conditions that we have completed a backfill sync
                 if anchor_info.block_backfill_complete(self.beacon_chain.genesis_backfill_slot) {
@@ -1171,6 +1155,15 @@ impl<T: BeaconChainTypes> BackFillSync<T> {
         false
     }
 
+    /// Checks if backfill would complete by syncing to `start_epoch`.
+    fn would_complete(&self, start_epoch: Epoch) -> bool {
+        start_epoch
+            <= self
+                .beacon_chain
+                .genesis_backfill_slot
+                .epoch(T::EthSpec::slots_per_epoch())
+    }
+
     /// Updates the global network state indicating the current state of a backfill sync.
     fn set_state(&self, state: BackFillState) {
         *self.network_globals.backfill_state.write() = state;
diff --git a/beacon_node/network/src/sync/block_lookups/mod.rs b/beacon_node/network/src/sync/block_lookups/mod.rs
index aa2694769c..4340aa41d8 100644
--- a/beacon_node/network/src/sync/block_lookups/mod.rs
+++ b/beacon_node/network/src/sync/block_lookups/mod.rs
@@ -2,6 +2,7 @@ use std::collections::hash_map::Entry;
 use std::collections::HashMap;
 use std::time::Duration;
 
+use crate::network_beacon_processor::ChainSegmentProcessId;
 use beacon_chain::{BeaconChainTypes, BlockError};
 use fnv::FnvHashMap;
 use lighthouse_network::{PeerAction, PeerId};
@@ -11,7 +12,6 @@ use smallvec::SmallVec;
 use std::sync::Arc;
 use store::{Hash256, SignedBeaconBlock};
 
-use crate::beacon_processor::{ChainSegmentProcessId, WorkEvent};
 use crate::metrics;
 
 use self::parent_lookup::PARENT_FAIL_TOLERANCE;
@@ -542,8 +542,8 @@ impl<T: BeaconChainTypes> BlockLookups<T> {
             BlockProcessResult::Ok
             | BlockProcessResult::Err(BlockError::BlockIsAlreadyKnown { .. }) => {
                 // Check if the beacon processor is available
-                let beacon_processor_send = match cx.processor_channel_if_enabled() {
-                    Some(channel) => channel,
+                let beacon_processor = match cx.beacon_processor_if_enabled() {
+                    Some(beacon_processor) => beacon_processor,
                     None => {
                         return trace!(
                             self.log,
@@ -555,7 +555,7 @@ impl<T: BeaconChainTypes> BlockLookups<T> {
                 let (chain_hash, blocks, hashes, request) = parent_lookup.parts_for_processing();
                 let process_id = ChainSegmentProcessId::ParentLookup(chain_hash);
 
-                match beacon_processor_send.try_send(WorkEvent::chain_segment(process_id, blocks)) {
+                match beacon_processor.send_chain_segment(process_id, blocks) {
                     Ok(_) => {
                         self.processing_parent_lookups
                             .insert(chain_hash, (hashes, request));
@@ -664,11 +664,15 @@ impl<T: BeaconChainTypes> BlockLookups<T> {
         process_type: BlockProcessType,
         cx: &mut SyncNetworkContext<T>,
     ) -> Result<(), ()> {
-        match cx.processor_channel_if_enabled() {
-            Some(beacon_processor_send) => {
+        match cx.beacon_processor_if_enabled() {
+            Some(beacon_processor) => {
                 trace!(self.log, "Sending block for processing"; "block" => ?block_root, "process" => ?process_type);
-                let event = WorkEvent::rpc_beacon_block(block_root, block, duration, process_type);
-                if let Err(e) = beacon_processor_send.try_send(event) {
+                if let Err(e) = beacon_processor.send_rpc_beacon_block(
+                    block_root,
+                    block,
+                    duration,
+                    process_type,
+                ) {
                     error!(
                         self.log,
                         "Failed to send sync block to processor";
diff --git a/beacon_node/network/src/sync/block_lookups/tests.rs b/beacon_node/network/src/sync/block_lookups/tests.rs
index 82334db0f8..c588f867bd 100644
--- a/beacon_node/network/src/sync/block_lookups/tests.rs
+++ b/beacon_node/network/src/sync/block_lookups/tests.rs
@@ -1,6 +1,6 @@
 use std::sync::Arc;
 
-use crate::beacon_processor::BeaconProcessorSend;
+use crate::network_beacon_processor::NetworkBeaconProcessor;
 use crate::service::RequestId;
 use crate::sync::manager::RequestId as SyncId;
 use crate::NetworkMessage;
@@ -9,18 +9,19 @@ use super::*;
 
 use beacon_chain::builder::Witness;
 use beacon_chain::eth1_chain::CachingEth1Backend;
+use beacon_processor::WorkEvent;
 use lighthouse_network::{NetworkGlobals, Request};
 use slog::{Drain, Level};
-use slot_clock::SystemTimeSlotClock;
+use slot_clock::ManualSlotClock;
 use store::MemoryStore;
 use tokio::sync::mpsc;
 use types::test_utils::{SeedableRng, TestRandom, XorShiftRng};
 use types::MinimalEthSpec as E;
 
-type T = Witness<SystemTimeSlotClock, CachingEth1Backend<E>, E, MemoryStore<E>, MemoryStore<E>>;
+type T = Witness<ManualSlotClock, CachingEth1Backend<E>, E, MemoryStore<E>, MemoryStore<E>>;
 
 struct TestRig {
-    beacon_processor_rx: mpsc::Receiver<WorkEvent<T>>,
+    beacon_processor_rx: mpsc::Receiver<WorkEvent<E>>,
     network_rx: mpsc::UnboundedReceiver<NetworkMessage<E>>,
     rng: XorShiftRng,
 }
@@ -41,8 +42,10 @@ impl TestRig {
             }
         };
 
-        let (beacon_processor_tx, beacon_processor_rx) = mpsc::channel(100);
         let (network_tx, network_rx) = mpsc::unbounded_channel();
+        let globals = Arc::new(NetworkGlobals::new_test_globals(Vec::new(), &log));
+        let (network_beacon_processor, beacon_processor_rx) =
+            NetworkBeaconProcessor::null_for_testing(globals);
         let rng = XorShiftRng::from_seed([42; 16]);
         let rig = TestRig {
             beacon_processor_rx,
@@ -51,11 +54,9 @@ impl TestRig {
         };
         let bl = BlockLookups::new(log.new(slog::o!("component" => "block_lookups")));
         let cx = {
-            let globals = Arc::new(NetworkGlobals::new_test_globals(Vec::new(), &log));
             SyncNetworkContext::new(
                 network_tx,
-                globals,
-                BeaconProcessorSend(beacon_processor_tx),
+                Arc::new(network_beacon_processor),
                 log.new(slog::o!("component" => "network_context")),
             )
         };
@@ -102,7 +103,7 @@ impl TestRig {
     fn expect_block_process(&mut self) {
         match self.beacon_processor_rx.try_recv() {
             Ok(work) => {
-                assert_eq!(work.work_type(), crate::beacon_processor::RPC_BLOCK);
+                assert_eq!(work.work_type(), beacon_processor::RPC_BLOCK);
             }
             other => panic!("Expected block process, found {:?}", other),
         }
@@ -112,7 +113,7 @@ impl TestRig {
     fn expect_parent_chain_process(&mut self) {
         match self.beacon_processor_rx.try_recv() {
             Ok(work) => {
-                assert_eq!(work.work_type(), crate::beacon_processor::CHAIN_SEGMENT);
+                assert_eq!(work.work_type(), beacon_processor::CHAIN_SEGMENT);
             }
             other => panic!("Expected chain segment process, found {:?}", other),
         }
diff --git a/beacon_node/network/src/sync/manager.rs b/beacon_node/network/src/sync/manager.rs
index c24d4c192b..b910f7b33c 100644
--- a/beacon_node/network/src/sync/manager.rs
+++ b/beacon_node/network/src/sync/manager.rs
@@ -38,7 +38,7 @@ use super::block_lookups::BlockLookups;
 use super::network_context::SyncNetworkContext;
 use super::peer_sync_info::{remote_sync_type, PeerSyncType};
 use super::range_sync::{RangeSync, RangeSyncType, EPOCHS_PER_BATCH};
-use crate::beacon_processor::{BeaconProcessorSend, ChainSegmentProcessId};
+use crate::network_beacon_processor::{ChainSegmentProcessId, NetworkBeaconProcessor};
 use crate::service::NetworkMessage;
 use crate::status::ToStatusMessage;
 use beacon_chain::{BeaconChain, BeaconChainTypes, BlockError, EngineState};
@@ -159,9 +159,6 @@ pub struct SyncManager<T: BeaconChainTypes> {
     /// A reference to the underlying beacon chain.
     chain: Arc<BeaconChain<T>>,
 
-    /// A reference to the network globals and peer-db.
-    network_globals: Arc<NetworkGlobals<T::EthSpec>>,
-
     /// A receiving channel sent by the message processor thread.
     input_channel: mpsc::UnboundedReceiver<SyncMessage<T::EthSpec>>,
 
@@ -186,29 +183,22 @@ pub struct SyncManager<T: BeaconChainTypes> {
 pub fn spawn<T: BeaconChainTypes>(
     executor: task_executor::TaskExecutor,
     beacon_chain: Arc<BeaconChain<T>>,
-    network_globals: Arc<NetworkGlobals<T::EthSpec>>,
     network_send: mpsc::UnboundedSender<NetworkMessage<T::EthSpec>>,
-    beacon_processor_send: BeaconProcessorSend<T>,
+    beacon_processor: Arc<NetworkBeaconProcessor<T>>,
+    sync_recv: mpsc::UnboundedReceiver<SyncMessage<T::EthSpec>>,
     log: slog::Logger,
-) -> mpsc::UnboundedSender<SyncMessage<T::EthSpec>> {
+) {
     assert!(
         MAX_REQUEST_BLOCKS >= T::EthSpec::slots_per_epoch() * EPOCHS_PER_BATCH,
         "Max blocks that can be requested in a single batch greater than max allowed blocks in a single request"
     );
-    // generate the message channel
-    let (sync_send, sync_recv) = mpsc::unbounded_channel::<SyncMessage<T::EthSpec>>();
 
     // create an instance of the SyncManager
+    let network_globals = beacon_processor.network_globals.clone();
     let mut sync_manager = SyncManager {
         chain: beacon_chain.clone(),
-        network_globals: network_globals.clone(),
         input_channel: sync_recv,
-        network: SyncNetworkContext::new(
-            network_send,
-            network_globals.clone(),
-            beacon_processor_send,
-            log.clone(),
-        ),
+        network: SyncNetworkContext::new(network_send, beacon_processor, log.clone()),
         range_sync: RangeSync::new(beacon_chain.clone(), log.clone()),
         backfill_sync: BackFillSync::new(beacon_chain, network_globals, log.clone()),
         block_lookups: BlockLookups::new(log.clone()),
@@ -218,10 +208,13 @@ pub fn spawn<T: BeaconChainTypes>(
     // spawn the sync manager thread
     debug!(log, "Sync Manager started");
     executor.spawn(async move { Box::pin(sync_manager.main()).await }, "sync");
-    sync_send
 }
 
 impl<T: BeaconChainTypes> SyncManager<T> {
+    fn network_globals(&self) -> &NetworkGlobals<T::EthSpec> {
+        self.network.network_globals()
+    }
+
     /* Input Handling Functions */
 
     /// A peer has connected which has blocks that are unknown to us.
@@ -322,12 +315,12 @@ impl<T: BeaconChainTypes> SyncManager<T> {
         let rpr = new_state.as_str();
         // Drop the write lock
         let update_sync_status = self
-            .network_globals
+            .network_globals()
             .peers
             .write()
             .update_sync_status(peer_id, new_state.clone());
         if let Some(was_updated) = update_sync_status {
-            let is_connected = self.network_globals.peers.read().is_connected(peer_id);
+            let is_connected = self.network_globals().peers.read().is_connected(peer_id);
             if was_updated {
                 debug!(
                     self.log,
@@ -383,7 +376,7 @@ impl<T: BeaconChainTypes> SyncManager<T> {
                         let head = self.chain.best_slot();
                         let current_slot = self.chain.slot().unwrap_or_else(|_| Slot::new(0));
 
-                        let peers = self.network_globals.peers.read();
+                        let peers = self.network_globals().peers.read();
                         if current_slot >= head
                             && current_slot.sub(head) <= (SLOT_IMPORT_TOLERANCE as u64)
                             && head > 0
@@ -402,6 +395,7 @@ impl<T: BeaconChainTypes> SyncManager<T> {
 
                     // If we would otherwise be synced, first check if we need to perform or
                     // complete a backfill sync.
+                    #[cfg(not(feature = "disable-backfill"))]
                     if matches!(sync_state, SyncState::Synced) {
                         // Determine if we need to start/resume/restart a backfill sync.
                         match self.backfill_sync.start(&mut self.network) {
@@ -426,6 +420,7 @@ impl<T: BeaconChainTypes> SyncManager<T> {
                 }
                 Some((RangeSyncType::Finalized, start_slot, target_slot)) => {
                     // If there is a backfill sync in progress pause it.
+                    #[cfg(not(feature = "disable-backfill"))]
                     self.backfill_sync.pause();
 
                     SyncState::SyncingFinalized {
@@ -435,6 +430,7 @@ impl<T: BeaconChainTypes> SyncManager<T> {
                 }
                 Some((RangeSyncType::Head, start_slot, target_slot)) => {
                     // If there is a backfill sync in progress pause it.
+                    #[cfg(not(feature = "disable-backfill"))]
                     self.backfill_sync.pause();
 
                     SyncState::SyncingHead {
@@ -445,8 +441,8 @@ impl<T: BeaconChainTypes> SyncManager<T> {
             },
         };
 
-        let old_state = self.network_globals.set_sync_state(new_state);
-        let new_state = self.network_globals.sync_state.read();
+        let old_state = self.network_globals().set_sync_state(new_state);
+        let new_state = self.network_globals().sync_state.read().clone();
         if !new_state.eq(&old_state) {
             info!(self.log, "Sync state updated"; "old_state" => %old_state, "new_state" => %new_state);
             // If we have become synced - Subscribe to all the core subnet topics
@@ -505,7 +501,7 @@ impl<T: BeaconChainTypes> SyncManager<T> {
             }
             SyncMessage::UnknownBlock(peer_id, block, block_root) => {
                 // If we are not synced or within SLOT_IMPORT_TOLERANCE of the block, ignore
-                if !self.network_globals.sync_state.read().is_synced() {
+                if !self.network_globals().sync_state.read().is_synced() {
                     let head_slot = self.chain.canonical_head.cached_head().head_slot();
                     let unknown_block_slot = block.slot();
 
@@ -519,7 +515,7 @@ impl<T: BeaconChainTypes> SyncManager<T> {
                         return;
                     }
                 }
-                if self.network_globals.peers.read().is_connected(&peer_id)
+                if self.network_globals().peers.read().is_connected(&peer_id)
                     && self.network.is_execution_engine_online()
                 {
                     self.block_lookups
@@ -528,8 +524,8 @@ impl<T: BeaconChainTypes> SyncManager<T> {
             }
             SyncMessage::UnknownBlockHash(peer_id, block_hash) => {
                 // If we are not synced, ignore this block.
-                if self.network_globals.sync_state.read().is_synced()
-                    && self.network_globals.peers.read().is_connected(&peer_id)
+                if self.network_globals().sync_state.read().is_synced()
+                    && self.network_globals().peers.read().is_connected(&peer_id)
                     && self.network.is_execution_engine_online()
                 {
                     self.block_lookups
diff --git a/beacon_node/network/src/sync/network_context.rs b/beacon_node/network/src/sync/network_context.rs
index 03c466eece..adc235130b 100644
--- a/beacon_node/network/src/sync/network_context.rs
+++ b/beacon_node/network/src/sync/network_context.rs
@@ -3,7 +3,7 @@
 
 use super::manager::{Id, RequestId as SyncRequestId};
 use super::range_sync::{BatchId, ChainId};
-use crate::beacon_processor::BeaconProcessorSend;
+use crate::network_beacon_processor::NetworkBeaconProcessor;
 use crate::service::{NetworkMessage, RequestId};
 use crate::status::ToStatusMessage;
 use beacon_chain::{BeaconChainTypes, EngineState};
@@ -20,9 +20,6 @@ pub struct SyncNetworkContext<T: BeaconChainTypes> {
     /// The network channel to relay messages to the Network service.
     network_send: mpsc::UnboundedSender<NetworkMessage<T::EthSpec>>,
 
-    /// Access to the network global vars.
-    network_globals: Arc<NetworkGlobals<T::EthSpec>>,
-
     /// A sequential ID for all RPC requests.
     request_id: Id,
 
@@ -36,8 +33,8 @@ pub struct SyncNetworkContext<T: BeaconChainTypes> {
     /// `beacon_processor_send`.
     execution_engine_state: EngineState,
 
-    /// Channel to send work to the beacon processor.
-    beacon_processor_send: BeaconProcessorSend<T>,
+    /// Sends work to the beacon processor via a channel.
+    network_beacon_processor: Arc<NetworkBeaconProcessor<T>>,
 
     /// Logger for the `SyncNetworkContext`.
     log: slog::Logger,
@@ -46,25 +43,27 @@ pub struct SyncNetworkContext<T: BeaconChainTypes> {
 impl<T: BeaconChainTypes> SyncNetworkContext<T> {
     pub fn new(
         network_send: mpsc::UnboundedSender<NetworkMessage<T::EthSpec>>,
-        network_globals: Arc<NetworkGlobals<T::EthSpec>>,
-        beacon_processor_send: BeaconProcessorSend<T>,
+        network_beacon_processor: Arc<NetworkBeaconProcessor<T>>,
         log: slog::Logger,
     ) -> Self {
         Self {
             network_send,
             execution_engine_state: EngineState::Online, // always assume `Online` at the start
-            network_globals,
             request_id: 1,
             range_requests: FnvHashMap::default(),
             backfill_requests: FnvHashMap::default(),
-            beacon_processor_send,
+            network_beacon_processor,
             log,
         }
     }
 
+    pub fn network_globals(&self) -> &NetworkGlobals<T::EthSpec> {
+        &self.network_beacon_processor.network_globals
+    }
+
     /// Returns the Client type of the peer if known
     pub fn client_type(&self, peer_id: &PeerId) -> Client {
-        self.network_globals
+        self.network_globals()
             .peers
             .read()
             .peer_info(peer_id)
@@ -278,13 +277,13 @@ impl<T: BeaconChainTypes> SyncNetworkContext<T> {
         })
     }
 
-    pub fn processor_channel_if_enabled(&self) -> Option<&BeaconProcessorSend<T>> {
+    pub fn beacon_processor_if_enabled(&self) -> Option<&Arc<NetworkBeaconProcessor<T>>> {
         self.is_execution_engine_online()
-            .then_some(&self.beacon_processor_send)
+            .then_some(&self.network_beacon_processor)
     }
 
-    pub fn processor_channel(&self) -> &BeaconProcessorSend<T> {
-        &self.beacon_processor_send
+    pub fn beacon_processor(&self) -> &Arc<NetworkBeaconProcessor<T>> {
+        &self.network_beacon_processor
     }
 
     fn next_id(&mut self) -> Id {
diff --git a/beacon_node/network/src/sync/range_sync/chain.rs b/beacon_node/network/src/sync/range_sync/chain.rs
index 51ca9e2b07..af547885dc 100644
--- a/beacon_node/network/src/sync/range_sync/chain.rs
+++ b/beacon_node/network/src/sync/range_sync/chain.rs
@@ -1,5 +1,5 @@
 use super::batch::{BatchInfo, BatchProcessingResult, BatchState};
-use crate::beacon_processor::{ChainSegmentProcessId, WorkEvent as BeaconWorkEvent};
+use crate::network_beacon_processor::ChainSegmentProcessId;
 use crate::sync::{
     manager::Id, network_context::SyncNetworkContext, BatchOperationOutcome, BatchProcessResult,
 };
@@ -294,8 +294,8 @@ impl<T: BeaconChainTypes> SyncingChain<T> {
             return Ok(KeepChain);
         }
 
-        let beacon_processor_send = match network.processor_channel_if_enabled() {
-            Some(channel) => channel,
+        let beacon_processor = match network.beacon_processor_if_enabled() {
+            Some(beacon_processor) => beacon_processor,
             None => return Ok(KeepChain),
         };
 
@@ -317,9 +317,7 @@ impl<T: BeaconChainTypes> SyncingChain<T> {
         let process_id = ChainSegmentProcessId::RangeBatchId(self.id, batch_id);
         self.current_processing_batch = Some(batch_id);
 
-        if let Err(e) =
-            beacon_processor_send.try_send(BeaconWorkEvent::chain_segment(process_id, blocks))
-        {
+        if let Err(e) = beacon_processor.send_chain_segment(process_id, blocks) {
             crit!(self.log, "Failed to send chain segment to processor."; "msg" => "process_batch",
                 "error" => %e, "batch" => self.processing_target);
             // This is unlikely to happen but it would stall syncing since the batch now has no
diff --git a/beacon_node/network/src/sync/range_sync/range.rs b/beacon_node/network/src/sync/range_sync/range.rs
index 2c35c57d9e..05ad5204b9 100644
--- a/beacon_node/network/src/sync/range_sync/range.rs
+++ b/beacon_node/network/src/sync/range_sync/range.rs
@@ -371,22 +371,23 @@ where
 
 #[cfg(test)]
 mod tests {
+    use crate::network_beacon_processor::NetworkBeaconProcessor;
     use crate::service::RequestId;
     use crate::NetworkMessage;
 
     use super::*;
-    use crate::beacon_processor::{BeaconProcessorSend, WorkEvent as BeaconWorkEvent};
     use beacon_chain::builder::Witness;
     use beacon_chain::eth1_chain::CachingEth1Backend;
     use beacon_chain::parking_lot::RwLock;
     use beacon_chain::EngineState;
+    use beacon_processor::WorkEvent as BeaconWorkEvent;
     use lighthouse_network::rpc::BlocksByRangeRequest;
     use lighthouse_network::Request;
     use lighthouse_network::{rpc::StatusMessage, NetworkGlobals};
     use slog::{o, Drain};
     use tokio::sync::mpsc;
 
-    use slot_clock::SystemTimeSlotClock;
+    use slot_clock::ManualSlotClock;
     use std::collections::HashSet;
     use std::sync::Arc;
     use store::MemoryStore;
@@ -437,7 +438,7 @@ mod tests {
     }
 
     type TestBeaconChainType =
-        Witness<SystemTimeSlotClock, CachingEth1Backend<E>, E, MemoryStore<E>, MemoryStore<E>>;
+        Witness<ManualSlotClock, CachingEth1Backend<E>, E, MemoryStore<E>, MemoryStore<E>>;
 
     fn build_log(level: slog::Level, enabled: bool) -> slog::Logger {
         let decorator = slog_term::TermDecorator::new().build();
@@ -455,7 +456,7 @@ mod tests {
     struct TestRig {
         log: slog::Logger,
         /// To check what does sync send to the beacon processor.
-        beacon_processor_rx: mpsc::Receiver<BeaconWorkEvent<TestBeaconChainType>>,
+        beacon_processor_rx: mpsc::Receiver<BeaconWorkEvent<E>>,
         /// To set up different scenarios where sync is told about known/unkown blocks.
         chain: Arc<FakeStorage>,
         /// Needed by range to handle communication with the network.
@@ -583,7 +584,7 @@ mod tests {
         fn expect_chain_segment(&mut self) {
             match self.beacon_processor_rx.try_recv() {
                 Ok(work) => {
-                    assert_eq!(work.work_type(), crate::beacon_processor::CHAIN_SEGMENT);
+                    assert_eq!(work.work_type(), beacon_processor::CHAIN_SEGMENT);
                 }
                 other => panic!("Expected chain segment process, found {:?}", other),
             }
@@ -593,17 +594,17 @@ mod tests {
     fn range(log_enabled: bool) -> (TestRig, RangeSync<TestBeaconChainType, FakeStorage>) {
         let chain = Arc::new(FakeStorage::default());
         let log = build_log(slog::Level::Trace, log_enabled);
-        let (beacon_processor_tx, beacon_processor_rx) = mpsc::channel(10);
         let range_sync = RangeSync::<TestBeaconChainType, FakeStorage>::new(
             chain.clone(),
             log.new(o!("component" => "range")),
         );
         let (network_tx, network_rx) = mpsc::unbounded_channel();
         let globals = Arc::new(NetworkGlobals::new_test_globals(Vec::new(), &log));
+        let (network_beacon_processor, beacon_processor_rx) =
+            NetworkBeaconProcessor::null_for_testing(globals.clone());
         let cx = SyncNetworkContext::new(
             network_tx,
-            globals.clone(),
-            BeaconProcessorSend(beacon_processor_tx),
+            Arc::new(network_beacon_processor),
             log.new(o!("component" => "network_context")),
         );
         let test_rig = TestRig {
diff --git a/beacon_node/operation_pool/src/reward_cache.rs b/beacon_node/operation_pool/src/reward_cache.rs
index 5b9d4258e9..9e4c424bd7 100644
--- a/beacon_node/operation_pool/src/reward_cache.rs
+++ b/beacon_node/operation_pool/src/reward_cache.rs
@@ -12,7 +12,7 @@ struct Initialization {
 #[derive(Debug, Clone, Default)]
 pub struct RewardCache {
     initialization: Option<Initialization>,
-    /// `BitVec` of validator indices which don't have default participation flags for the prev. epoch.
+    /// `BitVec` of validator indices which don't have default participation flags for the prev epoch.
     ///
     /// We choose to only track whether validators have *any* participation flag set because
     /// it's impossible to include a new attestation which is better than the existing participation
diff --git a/beacon_node/src/cli.rs b/beacon_node/src/cli.rs
index 646356b6cb..837625e12a 100644
--- a/beacon_node/src/cli.rs
+++ b/beacon_node/src/cli.rs
@@ -382,6 +382,35 @@ pub fn cli_app<'a, 'b>() -> App<'a, 'b> {
                     stalled. This is useful for very small testnets. TESTING ONLY. DO NOT USE ON \
                     MAINNET.")
         )
+        .arg(
+            Arg::with_name("http-sse-capacity-multiplier")
+                .long("http-sse-capacity-multiplier")
+                .takes_value(true)
+                .default_value("1")
+                .value_name("N")
+                .help("Multiplier to apply to the length of HTTP server-sent-event (SSE) channels. \
+                       Increasing this value can prevent messages from being dropped.")
+        )
+        .arg(
+            Arg::with_name("http-duplicate-block-status")
+                .long("http-duplicate-block-status")
+                .takes_value(true)
+                .default_value("202")
+                .value_name("STATUS_CODE")
+                .help("Status code to send when a block that is already known is POSTed to the \
+                       HTTP API.")
+        )
+        .arg(
+            Arg::with_name("http-enable-beacon-processor")
+                .long("http-enable-beacon-processor")
+                .value_name("BOOLEAN")
+                .help("The beacon processor is a scheduler which provides quality-of-service and \
+                    DoS protection. When set to \"true\", HTTP API requests will be queued and scheduled \
+                    alongside other tasks. When set to \"false\", HTTP API responses will be executed \
+                    immediately.")
+                .takes_value(true)
+                .default_value("true")
+        )
         /* Prometheus metrics HTTP server related arguments */
         .arg(
             Arg::with_name("metrics")
@@ -533,6 +562,16 @@ pub fn cli_app<'a, 'b>() -> App<'a, 'b> {
                        [default: 8192 (mainnet) or 64 (minimal)]")
                 .takes_value(true)
         )
+        .arg(
+            Arg::with_name("epochs-per-migration")
+                .long("epochs-per-migration")
+                .value_name("N")
+                .help("The number of epochs to wait between running the migration of data from the \
+                       hot DB to the cold DB. Less frequent runs can be useful for minimizing disk \
+                       writes")
+                .default_value("1")
+                .takes_value(true)
+        )
         .arg(
             Arg::with_name("block-cache-size")
                 .long("block-cache-size")
@@ -848,7 +887,7 @@ pub fn cli_app<'a, 'b>() -> App<'a, 'b> {
                 .help("Set the timeout for checkpoint sync calls to remote beacon node HTTP endpoint.")
                 .value_name("SECONDS")
                 .takes_value(true)
-                .default_value("60")
+                .default_value("180")
         )
         .arg(
             Arg::with_name("reconstruct-historic-states")
@@ -1095,7 +1134,6 @@ pub fn cli_app<'a, 'b>() -> App<'a, 'b> {
         .arg(
             Arg::with_name("gui")
                 .long("gui")
-                .hidden(true)
                 .help("Enable the graphical user interface and all its requirements. \
                       This enables --http and --validator-monitor-auto and enables SSE logging.")
                 .takes_value(false)
@@ -1131,4 +1169,55 @@ pub fn cli_app<'a, 'b>() -> App<'a, 'b> {
                 .takes_value(true)
                 .possible_values(ProgressiveBalancesMode::VARIANTS)
         )
+        .arg(
+            Arg::with_name("beacon-processor-max-workers")
+                .long("beacon-processor-max-workers")
+                .value_name("INTEGER")
+                .help("Specifies the maximum concurrent tasks for the task scheduler. Increasing \
+                        this value may increase resource consumption. Reducing the value \
+                        may result in decreased resource usage and diminished performance. The \
+                        default value is the number of logical CPU cores on the host.")
+                .takes_value(true)
+        )
+        .arg(
+            Arg::with_name("beacon-processor-work-queue-len")
+                .long("beacon-processor-work-queue-len")
+                .value_name("INTEGER")
+                .help("Specifies the length of the inbound event queue. \
+                        Higher values may prevent messages from being dropped while lower values \
+                        may help protect the node from becoming overwhelmed.")
+                .default_value("16384")
+                .takes_value(true)
+        )
+        .arg(
+            Arg::with_name("beacon-processor-reprocess-queue-len")
+                .long("beacon-processor-reprocess-queue-len")
+                .value_name("INTEGER")
+                .help("Specifies the length of the queue for messages requiring delayed processing. \
+                        Higher values may prevent messages from being dropped while lower values \
+                        may help protect the node from becoming overwhelmed.")
+                .default_value("12288")
+                .takes_value(true)
+        )
+        .arg(
+            Arg::with_name("beacon-processor-attestation-batch-size")
+                .long("beacon-processor-attestation-batch-size")
+                .value_name("INTEGER")
+                .help("Specifies the number of gossip attestations in a signature verification batch. \
+                       Higher values may reduce CPU usage in a healthy network whilst lower values may \
+                       increase CPU usage in an unhealthy or hostile network.")
+                .default_value("64")
+                .takes_value(true)
+        )
+        .arg(
+            Arg::with_name("beacon-processor-aggregate-batch-size")
+                .long("beacon-processor-aggregate-batch-size")
+                .value_name("INTEGER")
+                .help("Specifies the number of gossip aggregate attestations in a signature \
+                       verification batch. \
+                       Higher values may reduce CPU usage in a healthy network while lower values may \
+                       increase CPU usage in an unhealthy or hostile network.")
+                .default_value("64")
+                .takes_value(true)
+        )
 }
diff --git a/beacon_node/src/config.rs b/beacon_node/src/config.rs
index 948c70dd41..70495777e2 100644
--- a/beacon_node/src/config.rs
+++ b/beacon_node/src/config.rs
@@ -4,6 +4,7 @@ use beacon_chain::chain_config::{
 };
 use clap::ArgMatches;
 use clap_utils::flags::DISABLE_MALLOC_TUNING_FLAG;
+use clap_utils::parse_required;
 use client::{ClientConfig, ClientGenesis};
 use directory::{DEFAULT_BEACON_NODE_DIR, DEFAULT_NETWORK_DIR, DEFAULT_ROOT_DIR};
 use environment::RuntimeContext;
@@ -148,6 +149,15 @@ pub fn get_config<E: EthSpec>(
         client_config.http_api.allow_sync_stalled = true;
     }
 
+    client_config.http_api.sse_capacity_multiplier =
+        parse_required(cli_args, "http-sse-capacity-multiplier")?;
+
+    client_config.http_api.enable_beacon_processor =
+        parse_required(cli_args, "http-enable-beacon-processor")?;
+
+    client_config.http_api.duplicate_block_status_code =
+        parse_required(cli_args, "http-duplicate-block-status")?;
+
     if let Some(cache_size) = clap_utils::parse_optional(cli_args, "shuffling-cache-size")? {
         client_config.chain.shuffling_cache_size = cache_size;
     }
@@ -344,6 +354,9 @@ pub fn get_config<E: EthSpec>(
         el_config.default_datadir = client_config.data_dir().clone();
         el_config.builder_profit_threshold =
             clap_utils::parse_required(cli_args, "builder-profit-threshold")?;
+        el_config.always_prefer_builder_payload =
+            cli_args.is_present("always-prefer-builder-payload");
+
         let execution_timeout_multiplier =
             clap_utils::parse_required(cli_args, "execution-timeout-multiplier")?;
         el_config.execution_timeout_multiplier = Some(execution_timeout_multiplier);
@@ -400,6 +413,12 @@ pub fn get_config<E: EthSpec>(
         client_config.store.prune_payloads = prune_payloads;
     }
 
+    if let Some(epochs_per_migration) =
+        clap_utils::parse_optional(cli_args, "epochs-per-migration")?
+    {
+        client_config.chain.epochs_per_migration = epochs_per_migration;
+    }
+
     /*
      * Zero-ports
      *
@@ -452,9 +471,30 @@ pub fn get_config<E: EthSpec>(
     client_config.chain.checkpoint_sync_url_timeout =
         clap_utils::parse_required::<u64>(cli_args, "checkpoint-sync-url-timeout")?;
 
-    client_config.genesis = if let Some(genesis_state_bytes) =
-        eth2_network_config.genesis_state_bytes.clone()
-    {
+    client_config.genesis_state_url_timeout =
+        clap_utils::parse_required(cli_args, "genesis-state-url-timeout")
+            .map(Duration::from_secs)?;
+
+    let genesis_state_url_opt =
+        clap_utils::parse_optional::<String>(cli_args, "genesis-state-url")?;
+    let checkpoint_sync_url_opt =
+        clap_utils::parse_optional::<String>(cli_args, "checkpoint-sync-url")?;
+
+    // If the `--genesis-state-url` is defined, use that to download the
+    // genesis state bytes. If it's not defined, try `--checkpoint-sync-url`.
+    client_config.genesis_state_url = if let Some(genesis_state_url) = genesis_state_url_opt {
+        Some(genesis_state_url)
+    } else if let Some(checkpoint_sync_url) = checkpoint_sync_url_opt {
+        // If the checkpoint sync URL is going to be used to download the
+        // genesis state, adopt the timeout from the checkpoint sync URL too.
+        client_config.genesis_state_url_timeout =
+            Duration::from_secs(client_config.chain.checkpoint_sync_url_timeout);
+        Some(checkpoint_sync_url)
+    } else {
+        None
+    };
+
+    client_config.genesis = if eth2_network_config.genesis_state_is_known() {
         // Set up weak subjectivity sync, or start from the hardcoded genesis state.
         if let (Some(initial_state_path), Some(initial_block_path)) = (
             cli_args.value_of("checkpoint-state"),
@@ -476,7 +516,6 @@ pub fn get_config<E: EthSpec>(
             let anchor_block_bytes = read(initial_block_path)?;
 
             ClientGenesis::WeakSubjSszBytes {
-                genesis_state_bytes,
                 anchor_state_bytes,
                 anchor_block_bytes,
             }
@@ -484,17 +523,9 @@ pub fn get_config<E: EthSpec>(
             let url = SensitiveUrl::parse(remote_bn_url)
                 .map_err(|e| format!("Invalid checkpoint sync URL: {:?}", e))?;
 
-            ClientGenesis::CheckpointSyncUrl {
-                genesis_state_bytes,
-                url,
-            }
+            ClientGenesis::CheckpointSyncUrl { url }
         } else {
-            // Note: re-serializing the genesis state is not so efficient, however it avoids adding
-            // trait bounds to the `ClientGenesis` enum. This would have significant flow-on
-            // effects.
-            ClientGenesis::SszBytes {
-                genesis_state_bytes,
-            }
+            ClientGenesis::GenesisState
         }
     } else {
         if cli_args.is_present("checkpoint-state") || cli_args.is_present("checkpoint-sync-url") {
@@ -575,8 +606,10 @@ pub fn get_config<E: EthSpec>(
         };
     }
 
-    client_config.chain.max_network_size =
-        lighthouse_network::gossip_max_size(spec.bellatrix_fork_epoch.is_some());
+    client_config.chain.max_network_size = lighthouse_network::gossip_max_size(
+        spec.bellatrix_fork_epoch.is_some(),
+        spec.gossip_max_size as usize,
+    );
 
     if cli_args.is_present("slasher") {
         let slasher_dir = if let Some(slasher_dir) = cli_args.value_of("slasher-dir") {
@@ -786,13 +819,9 @@ pub fn get_config<E: EthSpec>(
     if cli_args.is_present("genesis-backfill") {
         client_config.chain.genesis_backfill = true;
     }
-    // Payload selection configs
-    if cli_args.is_present("always-prefer-builder-payload") {
-        client_config.always_prefer_builder_payload = true;
-    }
 
     // Backfill sync rate-limiting
-    client_config.chain.enable_backfill_rate_limiting =
+    client_config.beacon_processor.enable_backfill_rate_limiting =
         !cli_args.is_present("disable-backfill-rate-limiting");
 
     if let Some(path) = clap_utils::parse_optional(cli_args, "invalid-gossip-verified-blocks-path")?
@@ -806,6 +835,28 @@ pub fn get_config<E: EthSpec>(
         client_config.chain.progressive_balances_mode = progressive_balances_mode;
     }
 
+    if let Some(max_workers) = clap_utils::parse_optional(cli_args, "beacon-processor-max-workers")?
+    {
+        client_config.beacon_processor.max_workers = max_workers;
+    }
+
+    if client_config.beacon_processor.max_workers == 0 {
+        return Err("--beacon-processor-max-workers must be a non-zero value".to_string());
+    }
+
+    client_config.beacon_processor.max_work_event_queue_len =
+        clap_utils::parse_required(cli_args, "beacon-processor-work-queue-len")?;
+    client_config.beacon_processor.max_scheduled_work_queue_len =
+        clap_utils::parse_required(cli_args, "beacon-processor-reprocess-queue-len")?;
+    client_config
+        .beacon_processor
+        .max_gossip_attestation_batch_size =
+        clap_utils::parse_required(cli_args, "beacon-processor-attestation-batch-size")?;
+    client_config
+        .beacon_processor
+        .max_gossip_aggregate_batch_size =
+        clap_utils::parse_required(cli_args, "beacon-processor-aggregate-batch-size")?;
+
     Ok(client_config)
 }
 
diff --git a/beacon_node/src/lib.rs b/beacon_node/src/lib.rs
index 47694825ca..3bef69ce83 100644
--- a/beacon_node/src/lib.rs
+++ b/beacon_node/src/lib.rs
@@ -83,6 +83,7 @@ impl<E: EthSpec> ProductionBeaconNode<E> {
         let builder = ClientBuilder::new(context.eth_spec_instance.clone())
             .runtime_context(context)
             .chain_spec(spec)
+            .beacon_processor(client_config.beacon_processor.clone())
             .http_api_config(client_config.http_api.clone())
             .disk_store(&db_path, &freezer_db_path, store_config, log.clone())?;
 
diff --git a/beacon_node/store/src/chunked_iter.rs b/beacon_node/store/src/chunked_iter.rs
index 8ef0b6d201..b3322b5225 100644
--- a/beacon_node/store/src/chunked_iter.rs
+++ b/beacon_node/store/src/chunked_iter.rs
@@ -30,16 +30,16 @@ where
     /// Create a new iterator which can yield elements from `start_vindex` up to the last
     /// index stored by the restore point at `last_restore_point_slot`.
     ///
-    /// The `last_restore_point` slot should be the slot of a recent restore point as obtained from
-    /// `HotColdDB::get_latest_restore_point_slot`. We pass it as a parameter so that the caller can
+    /// The `freezer_upper_limit` slot should be the slot of a recent restore point as obtained from
+    /// `Root::freezer_upper_limit`. We pass it as a parameter so that the caller can
     /// maintain a stable view of the database (see `HybridForwardsBlockRootsIterator`).
     pub fn new(
         store: &'a HotColdDB<E, Hot, Cold>,
         start_vindex: usize,
-        last_restore_point_slot: Slot,
+        freezer_upper_limit: Slot,
         spec: &ChainSpec,
     ) -> Self {
-        let (_, end_vindex) = F::start_and_end_vindex(last_restore_point_slot, spec);
+        let (_, end_vindex) = F::start_and_end_vindex(freezer_upper_limit, spec);
 
         // Set the next chunk to the one containing `start_vindex`.
         let next_cindex = start_vindex / F::chunk_size();
diff --git a/beacon_node/store/src/chunked_vector.rs b/beacon_node/store/src/chunked_vector.rs
index 73edfbb074..537614f281 100644
--- a/beacon_node/store/src/chunked_vector.rs
+++ b/beacon_node/store/src/chunked_vector.rs
@@ -299,7 +299,8 @@ macro_rules! field {
             }
 
             fn update_pattern(spec: &ChainSpec) -> UpdatePattern {
-                $update_pattern(spec)
+                let update_pattern = $update_pattern;
+                update_pattern(spec)
             }
 
             fn get_value(
@@ -307,7 +308,8 @@ macro_rules! field {
                 vindex: u64,
                 spec: &ChainSpec,
             ) -> Result<Self::Value, ChunkError> {
-                $get_value(state, vindex, spec)
+                let get_value = $get_value;
+                get_value(state, vindex, spec)
             }
 
             fn is_fixed_length() -> bool {
diff --git a/beacon_node/store/src/forwards_iter.rs b/beacon_node/store/src/forwards_iter.rs
index 353be6bf05..125b73a458 100644
--- a/beacon_node/store/src/forwards_iter.rs
+++ b/beacon_node/store/src/forwards_iter.rs
@@ -19,6 +19,14 @@ pub trait Root<E: EthSpec>: Field<E, Value = Hash256> {
         end_state: BeaconState<E>,
         end_root: Hash256,
     ) -> Result<SimpleForwardsIterator>;
+
+    /// The first slot for which this field is *no longer* stored in the freezer database.
+    ///
+    /// If `None`, then this field is not stored in the freezer database at all due to pruning
+    /// configuration.
+    fn freezer_upper_limit<Hot: ItemStore<E>, Cold: ItemStore<E>>(
+        store: &HotColdDB<E, Hot, Cold>,
+    ) -> Option<Slot>;
 }
 
 impl<E: EthSpec> Root<E> for BlockRoots {
@@ -39,6 +47,13 @@ impl<E: EthSpec> Root<E> for BlockRoots {
         )?;
         Ok(SimpleForwardsIterator { values })
     }
+
+    fn freezer_upper_limit<Hot: ItemStore<E>, Cold: ItemStore<E>>(
+        store: &HotColdDB<E, Hot, Cold>,
+    ) -> Option<Slot> {
+        // Block roots are stored for all slots up to the split slot (exclusive).
+        Some(store.get_split_slot())
+    }
 }
 
 impl<E: EthSpec> Root<E> for StateRoots {
@@ -59,6 +74,15 @@ impl<E: EthSpec> Root<E> for StateRoots {
         )?;
         Ok(SimpleForwardsIterator { values })
     }
+
+    fn freezer_upper_limit<Hot: ItemStore<E>, Cold: ItemStore<E>>(
+        store: &HotColdDB<E, Hot, Cold>,
+    ) -> Option<Slot> {
+        // State roots are stored for all slots up to the latest restore point (exclusive).
+        // There may not be a latest restore point if state pruning is enabled, in which
+        // case this function will return `None`.
+        store.get_latest_restore_point_slot()
+    }
 }
 
 /// Forwards root iterator that makes use of a flat field table in the freezer DB.
@@ -118,6 +142,7 @@ impl Iterator for SimpleForwardsIterator {
 pub enum HybridForwardsIterator<'a, E: EthSpec, F: Root<E>, Hot: ItemStore<E>, Cold: ItemStore<E>> {
     PreFinalization {
         iter: Box<FrozenForwardsIterator<'a, E, F, Hot, Cold>>,
+        end_slot: Option<Slot>,
         /// Data required by the `PostFinalization` iterator when we get to it.
         continuation_data: Option<Box<(BeaconState<E>, Hash256)>>,
     },
@@ -129,6 +154,7 @@ pub enum HybridForwardsIterator<'a, E: EthSpec, F: Root<E>, Hot: ItemStore<E>, C
     PostFinalization {
         iter: SimpleForwardsIterator,
     },
+    Finished,
 }
 
 impl<'a, E: EthSpec, F: Root<E>, Hot: ItemStore<E>, Cold: ItemStore<E>>
@@ -138,8 +164,8 @@ impl<'a, E: EthSpec, F: Root<E>, Hot: ItemStore<E>, Cold: ItemStore<E>>
     ///
     /// The `get_state` closure should return a beacon state and final block/state root to backtrack
     /// from in the case where the iterated range does not lie entirely within the frozen portion of
-    /// the database. If an `end_slot` is provided and it is before the database's latest restore
-    /// point slot then the `get_state` closure will not be called at all.
+    /// the database. If an `end_slot` is provided and it is before the database's freezer upper
+    /// limit for the field then the `get_state` closure will not be called at all.
     ///
     /// It is OK for `get_state` to hold a lock while this function is evaluated, as the returned
     /// iterator is as lazy as possible and won't do any work apart from calling `get_state`.
@@ -155,13 +181,15 @@ impl<'a, E: EthSpec, F: Root<E>, Hot: ItemStore<E>, Cold: ItemStore<E>>
     ) -> Result<Self> {
         use HybridForwardsIterator::*;
 
-        let latest_restore_point_slot = store.get_latest_restore_point_slot();
+        // First slot at which this field is *not* available in the freezer. i.e. all slots less
+        // than this slot have their data available in the freezer.
+        let freezer_upper_limit = F::freezer_upper_limit(store).unwrap_or(Slot::new(0));
 
-        let result = if start_slot < latest_restore_point_slot {
+        let result = if start_slot < freezer_upper_limit {
             let iter = Box::new(FrozenForwardsIterator::new(
                 store,
                 start_slot,
-                latest_restore_point_slot,
+                freezer_upper_limit,
                 spec,
             ));
 
@@ -169,13 +197,14 @@ impl<'a, E: EthSpec, F: Root<E>, Hot: ItemStore<E>, Cold: ItemStore<E>>
             // `end_slot`. If it tries to continue further a `NoContinuationData` error will be
             // returned.
             let continuation_data =
-                if end_slot.map_or(false, |end_slot| end_slot < latest_restore_point_slot) {
+                if end_slot.map_or(false, |end_slot| end_slot < freezer_upper_limit) {
                     None
                 } else {
                     Some(Box::new(get_state()))
                 };
             PreFinalization {
                 iter,
+                end_slot,
                 continuation_data,
             }
         } else {
@@ -195,6 +224,7 @@ impl<'a, E: EthSpec, F: Root<E>, Hot: ItemStore<E>, Cold: ItemStore<E>>
         match self {
             PreFinalization {
                 iter,
+                end_slot,
                 continuation_data,
             } => {
                 match iter.next() {
@@ -203,10 +233,17 @@ impl<'a, E: EthSpec, F: Root<E>, Hot: ItemStore<E>, Cold: ItemStore<E>>
                     // to a post-finalization iterator beginning from the last slot
                     // of the pre iterator.
                     None => {
+                        // If the iterator has an end slot (inclusive) which has already been
+                        // covered by the (exclusive) frozen forwards iterator, then we're done!
+                        let iter_end_slot = Slot::from(iter.inner.end_vindex);
+                        if end_slot.map_or(false, |end_slot| iter_end_slot == end_slot + 1) {
+                            *self = Finished;
+                            return Ok(None);
+                        }
+
                         let continuation_data = continuation_data.take();
                         let store = iter.inner.store;
-                        let start_slot = Slot::from(iter.inner.end_vindex);
-
+                        let start_slot = iter_end_slot;
                         *self = PostFinalizationLazy {
                             continuation_data,
                             store,
@@ -230,6 +267,7 @@ impl<'a, E: EthSpec, F: Root<E>, Hot: ItemStore<E>, Cold: ItemStore<E>>
                 self.do_next()
             }
             PostFinalization { iter } => iter.next().transpose(),
+            Finished => Ok(None),
         }
     }
 }
diff --git a/beacon_node/store/src/hot_cold_store.rs b/beacon_node/store/src/hot_cold_store.rs
index 7695ea520e..87f8e0ffc3 100644
--- a/beacon_node/store/src/hot_cold_store.rs
+++ b/beacon_node/store/src/hot_cold_store.rs
@@ -14,11 +14,11 @@ use crate::memory_store::MemoryStore;
 use crate::metadata::{
     AnchorInfo, CompactionTimestamp, PruningCheckpoint, SchemaVersion, ANCHOR_INFO_KEY,
     COMPACTION_TIMESTAMP_KEY, CONFIG_KEY, CURRENT_SCHEMA_VERSION, PRUNING_CHECKPOINT_KEY,
-    SCHEMA_VERSION_KEY, SPLIT_KEY,
+    SCHEMA_VERSION_KEY, SPLIT_KEY, STATE_UPPER_LIMIT_NO_RETAIN,
 };
 use crate::metrics;
 use crate::{
-    get_key_for_col, DBColumn, DatabaseBlock, Error, ItemStore, KeyValueStoreOp,
+    get_key_for_col, ChunkWriter, DBColumn, DatabaseBlock, Error, ItemStore, KeyValueStoreOp,
     PartialBeaconState, StoreItem, StoreOp,
 };
 use itertools::process_results;
@@ -110,10 +110,10 @@ pub enum HotColdDBError {
     IterationError {
         unexpected_key: BytesKey,
     },
-    AttestationStateIsFinalized {
+    FinalizedStateNotInHotDatabase {
         split_slot: Slot,
-        request_slot: Option<Slot>,
-        state_root: Hash256,
+        request_slot: Slot,
+        block_root: Hash256,
     },
 }
 
@@ -545,7 +545,7 @@ impl<E: EthSpec, Hot: ItemStore<E>, Cold: ItemStore<E>> HotColdDB<E, Hot, Cold>
     /// upon that state (e.g., state roots). Additionally, only states from the hot store are
     /// returned.
     ///
-    /// See `Self::get_state` for information about `slot`.
+    /// See `Self::get_advanced_hot_state` for information about `max_slot`.
     ///
     /// ## Warning
     ///
@@ -557,23 +557,78 @@ impl<E: EthSpec, Hot: ItemStore<E>, Cold: ItemStore<E>> HotColdDB<E, Hot, Cold>
     /// - `state.block_roots`
     pub fn get_inconsistent_state_for_attestation_verification_only(
         &self,
-        state_root: &Hash256,
-        slot: Option<Slot>,
-    ) -> Result<Option<BeaconState<E>>, Error> {
+        block_root: &Hash256,
+        max_slot: Slot,
+        state_root: Hash256,
+    ) -> Result<Option<(Hash256, BeaconState<E>)>, Error> {
         metrics::inc_counter(&metrics::BEACON_STATE_GET_COUNT);
+        self.get_advanced_hot_state_with_strategy(
+            *block_root,
+            max_slot,
+            state_root,
+            StateProcessingStrategy::Inconsistent,
+        )
+    }
 
-        let split_slot = self.get_split_slot();
+    /// Get a state with `latest_block_root == block_root` advanced through to at most `max_slot`.
+    ///
+    /// The `state_root` argument is used to look up the block's un-advanced state in case an
+    /// advanced state is not found.
+    ///
+    /// Return the `(result_state_root, state)` satisfying:
+    ///
+    /// - `result_state_root == state.canonical_root()`
+    /// - `state.slot() <= max_slot`
+    /// - `state.get_latest_block_root(result_state_root) == block_root`
+    ///
+    /// Presently this is only used to avoid loading the un-advanced split state, but in future will
+    /// be expanded to return states from an in-memory cache.
+    pub fn get_advanced_hot_state(
+        &self,
+        block_root: Hash256,
+        max_slot: Slot,
+        state_root: Hash256,
+    ) -> Result<Option<(Hash256, BeaconState<E>)>, Error> {
+        self.get_advanced_hot_state_with_strategy(
+            block_root,
+            max_slot,
+            state_root,
+            StateProcessingStrategy::Accurate,
+        )
+    }
 
-        if slot.map_or(false, |slot| slot < split_slot) {
-            Err(HotColdDBError::AttestationStateIsFinalized {
-                split_slot,
-                request_slot: slot,
-                state_root: *state_root,
+    /// Same as `get_advanced_hot_state` but taking a `StateProcessingStrategy`.
+    pub fn get_advanced_hot_state_with_strategy(
+        &self,
+        block_root: Hash256,
+        max_slot: Slot,
+        state_root: Hash256,
+        state_processing_strategy: StateProcessingStrategy,
+    ) -> Result<Option<(Hash256, BeaconState<E>)>, Error> {
+        // Hold a read lock on the split point so it can't move while we're trying to load the
+        // state.
+        let split = self.split.read_recursive();
+
+        // Sanity check max-slot against the split slot.
+        if max_slot < split.slot {
+            return Err(HotColdDBError::FinalizedStateNotInHotDatabase {
+                split_slot: split.slot,
+                request_slot: max_slot,
+                block_root,
             }
-            .into())
-        } else {
-            self.load_hot_state(state_root, StateProcessingStrategy::Inconsistent)
+            .into());
         }
+
+        let state_root = if block_root == split.block_root && split.slot <= max_slot {
+            split.state_root
+        } else {
+            state_root
+        };
+        let state = self
+            .load_hot_state(&state_root, state_processing_strategy)?
+            .map(|state| (state_root, state));
+        drop(split);
+        Ok(state)
     }
 
     /// Delete a state, ensuring it is removed from the LRU cache, as well as from on-disk.
@@ -908,6 +963,9 @@ impl<E: EthSpec, Hot: ItemStore<E>, Cold: ItemStore<E>> HotColdDB<E, Hot, Cold>
         ops.push(op);
 
         // 2. Store updated vector entries.
+        // Block roots need to be written here as well as by the `ChunkWriter` in `migrate_db`
+        // because states may require older block roots, and the writer only stores block roots
+        // between the previous split point and the new split point.
         let db = &self.cold_db;
         store_updated_vector(BlockRoots, db, state, &self.spec, ops)?;
         store_updated_vector(StateRoots, db, state, &self.spec, ops)?;
@@ -1180,14 +1238,29 @@ impl<E: EthSpec, Hot: ItemStore<E>, Cold: ItemStore<E>> HotColdDB<E, Hot, Cold>
         *self.split.read_recursive()
     }
 
-    pub fn set_split(&self, slot: Slot, state_root: Hash256) {
-        *self.split.write() = Split { slot, state_root };
+    pub fn set_split(&self, slot: Slot, state_root: Hash256, block_root: Hash256) {
+        *self.split.write() = Split {
+            slot,
+            state_root,
+            block_root,
+        };
     }
 
-    /// Fetch the slot of the most recently stored restore point.
-    pub fn get_latest_restore_point_slot(&self) -> Slot {
-        (self.get_split_slot() - 1) / self.config.slots_per_restore_point
-            * self.config.slots_per_restore_point
+    /// Fetch the slot of the most recently stored restore point (if any).
+    pub fn get_latest_restore_point_slot(&self) -> Option<Slot> {
+        let split_slot = self.get_split_slot();
+        let anchor = self.get_anchor_info();
+
+        // There are no restore points stored if the state upper limit lies in the hot database.
+        // It hasn't been reached yet, and may never be.
+        if anchor.map_or(false, |a| a.state_upper_limit >= split_slot) {
+            None
+        } else {
+            Some(
+                (split_slot - 1) / self.config.slots_per_restore_point
+                    * self.config.slots_per_restore_point,
+            )
+        }
     }
 
     /// Load the database schema version from disk.
@@ -1216,25 +1289,36 @@ impl<E: EthSpec, Hot: ItemStore<E>, Cold: ItemStore<E>> HotColdDB<E, Hot, Cold>
     }
 
     /// Initialise the anchor info for checkpoint sync starting from `block`.
-    pub fn init_anchor_info(&self, block: BeaconBlockRef<'_, E>) -> Result<KeyValueStoreOp, Error> {
+    pub fn init_anchor_info(
+        &self,
+        block: BeaconBlockRef<'_, E>,
+        retain_historic_states: bool,
+    ) -> Result<KeyValueStoreOp, Error> {
         let anchor_slot = block.slot();
         let slots_per_restore_point = self.config.slots_per_restore_point;
 
-        // Set the `state_upper_limit` to the slot of the *next* restore point.
-        // See `get_state_upper_limit` for rationale.
-        let next_restore_point_slot = if anchor_slot % slots_per_restore_point == 0 {
+        let state_upper_limit = if !retain_historic_states {
+            STATE_UPPER_LIMIT_NO_RETAIN
+        } else if anchor_slot % slots_per_restore_point == 0 {
             anchor_slot
         } else {
+            // Set the `state_upper_limit` to the slot of the *next* restore point.
+            // See `get_state_upper_limit` for rationale.
             (anchor_slot / slots_per_restore_point + 1) * slots_per_restore_point
         };
-        let anchor_info = AnchorInfo {
-            anchor_slot,
-            oldest_block_slot: anchor_slot,
-            oldest_block_parent: block.parent_root(),
-            state_upper_limit: next_restore_point_slot,
-            state_lower_limit: self.spec.genesis_slot,
+        let anchor_info = if state_upper_limit == 0 && anchor_slot == 0 {
+            // Genesis archive node: no anchor because we *will* store all states.
+            None
+        } else {
+            Some(AnchorInfo {
+                anchor_slot,
+                oldest_block_slot: anchor_slot,
+                oldest_block_parent: block.parent_root(),
+                state_upper_limit,
+                state_lower_limit: self.spec.genesis_slot,
+            })
         };
-        self.compare_and_set_anchor_info(None, Some(anchor_info))
+        self.compare_and_set_anchor_info(None, anchor_info)
     }
 
     /// Get a clone of the store's anchor info.
@@ -1361,11 +1445,26 @@ impl<E: EthSpec, Hot: ItemStore<E>, Cold: ItemStore<E>> HotColdDB<E, Hot, Cold>
         self.hot_db.put(&CONFIG_KEY, &self.config.as_disk_config())
     }
 
-    /// Load the split point from disk.
-    fn load_split(&self) -> Result<Option<Split>, Error> {
+    /// Load the split point from disk, sans block root.
+    fn load_split_partial(&self) -> Result<Option<Split>, Error> {
         self.hot_db.get(&SPLIT_KEY)
     }
 
+    /// Load the split point from disk, including block root.
+    fn load_split(&self) -> Result<Option<Split>, Error> {
+        match self.load_split_partial()? {
+            Some(mut split) => {
+                // Load the hot state summary to get the block root.
+                let summary = self.load_hot_state_summary(&split.state_root)?.ok_or(
+                    HotColdDBError::MissingSplitState(split.state_root, split.slot),
+                )?;
+                split.block_root = summary.latest_block_root;
+                Ok(Some(split))
+            }
+            None => Ok(None),
+        }
+    }
+
     /// Stage the split for storage to disk.
     pub fn store_split_in_batch(&self) -> KeyValueStoreOp {
         self.split.read_recursive().as_kv_store_op(SPLIT_KEY)
@@ -1500,6 +1599,25 @@ impl<E: EthSpec, Hot: ItemStore<E>, Cold: ItemStore<E>> HotColdDB<E, Hot, Cold>
         )
     }
 
+    /// Update the linear array of frozen block roots with the block root for several skipped slots.
+    ///
+    /// Write the block root at all slots from `start_slot` (inclusive) to `end_slot` (exclusive).
+    pub fn store_frozen_block_root_at_skip_slots(
+        &self,
+        start_slot: Slot,
+        end_slot: Slot,
+        block_root: Hash256,
+    ) -> Result<Vec<KeyValueStoreOp>, Error> {
+        let mut ops = vec![];
+        let mut block_root_writer =
+            ChunkWriter::<BlockRoots, _, _>::new(&self.cold_db, start_slot.as_usize())?;
+        for slot in start_slot.as_usize()..end_slot.as_usize() {
+            block_root_writer.set(slot, block_root, &mut ops)?;
+        }
+        block_root_writer.write(&mut ops)?;
+        Ok(ops)
+    }
+
     /// Try to prune all execution payloads, returning early if there is no need to prune.
     pub fn try_prune_execution_payloads(&self, force: bool) -> Result<(), Error> {
         let split = self.get_split_info();
@@ -1611,42 +1729,47 @@ impl<E: EthSpec, Hot: ItemStore<E>, Cold: ItemStore<E>> HotColdDB<E, Hot, Cold>
 /// Advance the split point of the store, moving new finalized states to the freezer.
 pub fn migrate_database<E: EthSpec, Hot: ItemStore<E>, Cold: ItemStore<E>>(
     store: Arc<HotColdDB<E, Hot, Cold>>,
-    frozen_head_root: Hash256,
-    frozen_head: &BeaconState<E>,
+    finalized_state_root: Hash256,
+    finalized_block_root: Hash256,
+    finalized_state: &BeaconState<E>,
 ) -> Result<(), Error> {
     debug!(
         store.log,
         "Freezer migration started";
-        "slot" => frozen_head.slot()
+        "slot" => finalized_state.slot()
     );
 
     // 0. Check that the migration is sensible.
-    // The new frozen head must increase the current split slot, and lie on an epoch
+    // The new finalized state must increase the current split slot, and lie on an epoch
     // boundary (in order for the hot state summary scheme to work).
     let current_split_slot = store.split.read_recursive().slot;
-    let anchor_slot = store
-        .anchor_info
-        .read_recursive()
-        .as_ref()
-        .map(|a| a.anchor_slot);
+    let anchor_info = store.anchor_info.read_recursive().clone();
+    let anchor_slot = anchor_info.as_ref().map(|a| a.anchor_slot);
 
-    if frozen_head.slot() < current_split_slot {
+    if finalized_state.slot() < current_split_slot {
         return Err(HotColdDBError::FreezeSlotError {
             current_split_slot,
-            proposed_split_slot: frozen_head.slot(),
+            proposed_split_slot: finalized_state.slot(),
         }
         .into());
     }
 
-    if frozen_head.slot() % E::slots_per_epoch() != 0 {
-        return Err(HotColdDBError::FreezeSlotUnaligned(frozen_head.slot()).into());
+    if finalized_state.slot() % E::slots_per_epoch() != 0 {
+        return Err(HotColdDBError::FreezeSlotUnaligned(finalized_state.slot()).into());
     }
 
-    let mut hot_db_ops: Vec<StoreOp<E>> = Vec::new();
+    let mut hot_db_ops = vec![];
+    let mut cold_db_ops = vec![];
 
-    // 1. Copy all of the states between the head and the split slot, from the hot DB
+    // Chunk writer for the linear block roots in the freezer DB.
+    // Start at the new upper limit because we iterate backwards.
+    let new_frozen_block_root_upper_limit = finalized_state.slot().as_usize().saturating_sub(1);
+    let mut block_root_writer =
+        ChunkWriter::<BlockRoots, _, _>::new(&store.cold_db, new_frozen_block_root_upper_limit)?;
+
+    // 1. Copy all of the states between the new finalized state and the split slot, from the hot DB
     // to the cold DB. Delete the execution payloads of these now-finalized blocks.
-    let state_root_iter = RootsIterator::new(&store, frozen_head);
+    let state_root_iter = RootsIterator::new(&store, finalized_state);
     for maybe_tuple in state_root_iter.take_while(|result| match result {
         Ok((_, _, slot)) => {
             slot >= &current_split_slot
@@ -1656,13 +1779,31 @@ pub fn migrate_database<E: EthSpec, Hot: ItemStore<E>, Cold: ItemStore<E>>(
     }) {
         let (block_root, state_root, slot) = maybe_tuple?;
 
-        let mut cold_db_ops: Vec<KeyValueStoreOp> = Vec::new();
+        // Delete the execution payload if payload pruning is enabled. At a skipped slot we may
+        // delete the payload for the finalized block itself, but that's OK as we only guarantee
+        // that payloads are present for slots >= the split slot. The payload fetching code is also
+        // forgiving of missing payloads.
+        if store.config.prune_payloads {
+            hot_db_ops.push(StoreOp::DeleteExecutionPayload(block_root));
+        }
 
-        if slot % store.config.slots_per_restore_point == 0 {
-            let state: BeaconState<E> = get_full_state(&store.hot_db, &state_root, &store.spec)?
-                .ok_or(HotColdDBError::MissingStateToFreeze(state_root))?;
+        // Delete the old summary, and the full state if we lie on an epoch boundary.
+        hot_db_ops.push(StoreOp::DeleteState(state_root, Some(slot)));
 
-            store.store_cold_state(&state_root, &state, &mut cold_db_ops)?;
+        // Store the block root for this slot in the linear array of frozen block roots.
+        block_root_writer.set(slot.as_usize(), block_root, &mut cold_db_ops)?;
+
+        // Do not try to store states if a restore point is yet to be stored, or will never be
+        // stored (see `STATE_UPPER_LIMIT_NO_RETAIN`). Make an exception for the genesis state
+        // which always needs to be copied from the hot DB to the freezer and should not be deleted.
+        if slot != 0
+            && anchor_info
+                .as_ref()
+                .map_or(false, |anchor| slot < anchor.state_upper_limit)
+        {
+            debug!(store.log, "Pruning finalized state"; "slot" => slot);
+
+            continue;
         }
 
         // Store a pointer from this state root to its slot, so we can later reconstruct states
@@ -1671,22 +1812,24 @@ pub fn migrate_database<E: EthSpec, Hot: ItemStore<E>, Cold: ItemStore<E>>(
         let op = cold_state_summary.as_kv_store_op(state_root);
         cold_db_ops.push(op);
 
-        // There are data dependencies between calls to `store_cold_state()` that prevent us from
-        // doing one big call to `store.cold_db.do_atomically()` at end of the loop.
-        store.cold_db.do_atomically(cold_db_ops)?;
+        if slot % store.config.slots_per_restore_point == 0 {
+            let state: BeaconState<E> = get_full_state(&store.hot_db, &state_root, &store.spec)?
+                .ok_or(HotColdDBError::MissingStateToFreeze(state_root))?;
 
-        // Delete the old summary, and the full state if we lie on an epoch boundary.
-        hot_db_ops.push(StoreOp::DeleteState(state_root, Some(slot)));
+            store.store_cold_state(&state_root, &state, &mut cold_db_ops)?;
 
-        // Delete the execution payload if payload pruning is enabled. At a skipped slot we may
-        // delete the payload for the finalized block itself, but that's OK as we only guarantee
-        // that payloads are present for slots >= the split slot. The payload fetching code is also
-        // forgiving of missing payloads.
-        if store.config.prune_payloads {
-            hot_db_ops.push(StoreOp::DeleteExecutionPayload(block_root));
+            // Commit the batch of cold DB ops whenever a full state is written. Each state stored
+            // may read the linear fields of previous states stored.
+            store
+                .cold_db
+                .do_atomically(std::mem::take(&mut cold_db_ops))?;
         }
     }
 
+    // Finish writing the block roots and commit the remaining cold DB ops.
+    block_root_writer.write(&mut cold_db_ops)?;
+    store.cold_db.do_atomically(cold_db_ops)?;
+
     // Warning: Critical section.  We have to take care not to put any of the two databases in an
     //          inconsistent state if the OS process dies at any point during the freezeing
     //          procedure.
@@ -1724,8 +1867,9 @@ pub fn migrate_database<E: EthSpec, Hot: ItemStore<E>, Cold: ItemStore<E>>(
         // Before updating the in-memory split value, we flush it to disk first, so that should the
         // OS process die at this point, we pick up from the right place after a restart.
         let split = Split {
-            slot: frozen_head.slot(),
-            state_root: frozen_head_root,
+            slot: finalized_state.slot(),
+            state_root: finalized_state_root,
+            block_root: finalized_block_root,
         };
         store.hot_db.put_sync(&SPLIT_KEY, &split)?;
 
@@ -1741,7 +1885,7 @@ pub fn migrate_database<E: EthSpec, Hot: ItemStore<E>, Cold: ItemStore<E>>(
     debug!(
         store.log,
         "Freezer migration complete";
-        "slot" => frozen_head.slot()
+        "slot" => finalized_state.slot()
     );
 
     Ok(())
@@ -1750,8 +1894,16 @@ pub fn migrate_database<E: EthSpec, Hot: ItemStore<E>, Cold: ItemStore<E>>(
 /// Struct for storing the split slot and state root in the database.
 #[derive(Debug, Clone, Copy, PartialEq, Default, Encode, Decode, Deserialize, Serialize)]
 pub struct Split {
-    pub(crate) slot: Slot,
-    pub(crate) state_root: Hash256,
+    pub slot: Slot,
+    pub state_root: Hash256,
+    /// The block root of the split state.
+    ///
+    /// This is used to provide special handling for the split state in the case where there are
+    /// skipped slots. The split state will *always* be the advanced state, so callers
+    /// who only have the finalized block root should use `get_advanced_hot_state` to get this state,
+    /// rather than fetching `block.state_root()` (the unaligned state) which will have been pruned.
+    #[ssz(skip_serializing, skip_deserializing)]
+    pub block_root: Hash256,
 }
 
 impl StoreItem for Split {
diff --git a/beacon_node/store/src/leveldb_store.rs b/beacon_node/store/src/leveldb_store.rs
index 86bd4ffacc..7aac9f72d9 100644
--- a/beacon_node/store/src/leveldb_store.rs
+++ b/beacon_node/store/src/leveldb_store.rs
@@ -167,7 +167,7 @@ impl<E: EthSpec> KeyValueStore<E> for LevelDB<E> {
             )
         };
 
-        for (start_key, end_key) in vec![
+        for (start_key, end_key) in [
             endpoints(DBColumn::BeaconStateTemporary),
             endpoints(DBColumn::BeaconState),
         ] {
diff --git a/beacon_node/store/src/metadata.rs b/beacon_node/store/src/metadata.rs
index 6f50d7038f..ccfddcf8f8 100644
--- a/beacon_node/store/src/metadata.rs
+++ b/beacon_node/store/src/metadata.rs
@@ -16,6 +16,9 @@ pub const PRUNING_CHECKPOINT_KEY: Hash256 = Hash256::repeat_byte(3);
 pub const COMPACTION_TIMESTAMP_KEY: Hash256 = Hash256::repeat_byte(4);
 pub const ANCHOR_INFO_KEY: Hash256 = Hash256::repeat_byte(5);
 
+/// State upper limit value used to indicate that a node is not storing historic states.
+pub const STATE_UPPER_LIMIT_NO_RETAIN: Slot = Slot::new(u64::MAX);
+
 #[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord)]
 pub struct SchemaVersion(pub u64);
 
diff --git a/book/src/SUMMARY.md b/book/src/SUMMARY.md
index 7431d22387..507896f431 100644
--- a/book/src/SUMMARY.md
+++ b/book/src/SUMMARY.md
@@ -12,6 +12,9 @@
 * [Run a Node](./run_a_node.md)
 * [Become a Validator](./mainnet-validator.md)
 * [Validator Management](./validator-management.md)
+    * [The `validator-manager` Command](./validator-manager.md)
+        * [Creating validators](./validator-manager-create.md)
+        * [Moving validators](./validator-manager-move.md)
     * [Slashing Protection](./slashing-protection.md)
     * [Voluntary Exits](./voluntary-exit.md)
     * [Partial Withdrawals](./partial-withdrawal.md)
@@ -41,7 +44,7 @@
     * [Remote Signing with Web3Signer](./validator-web3signer.md)
     * [Database Configuration](./advanced_database.md)
     * [Database Migrations](./database-migrations.md)
-    * [Key Management](./key-management.md)
+    * [Key Management (Deprecated)](./key-management.md)
     * [Key Recovery](./key-recovery.md)
     * [Advanced Networking](./advanced_networking.md)
     * [Running a Slasher](./slasher.md)
diff --git a/book/src/advanced_database.md b/book/src/advanced_database.md
index d951104054..20c5d7443b 100644
--- a/book/src/advanced_database.md
+++ b/book/src/advanced_database.md
@@ -28,8 +28,8 @@ some example values.
 | Research                   | 32   | 3.4 TB            | 155 ms                |
 | Block explorer/analysis    | 128  | 851 GB            | 620 ms                |
 | Enthusiast (prev. default) | 2048 | 53.6 GB           | 10.2 s                |
-| Hobbyist                  | 4096 | 26.8 GB           | 20.5 s                |
-| Validator only (default)   | 8192 | 8.1 GB            | 41 s                  |
+| Hobbyist                   | 4096 | 26.8 GB           | 20.5 s                |
+| Validator only (default)   | 8192 | 12.7 GB           | 41 s                  |
 
 *Last update: May 2023. 
 
diff --git a/book/src/advanced_networking.md b/book/src/advanced_networking.md
index 586503cb96..ba07a6f87f 100644
--- a/book/src/advanced_networking.md
+++ b/book/src/advanced_networking.md
@@ -172,7 +172,7 @@ In order to do so, lighthouse provides the following CLI options/parameters.
   advertises some address, must be
   reachable both over UDP and TCP.
 
-In the general case, an user will not require to set these explicitly. Update
+In the general case, a user will not require to set these explicitly. Update
 these options only if you can guarantee your node is reachable with these
 values.
 
diff --git a/book/src/builders.md b/book/src/builders.md
index 6db360d70e..2be4841ddf 100644
--- a/book/src/builders.md
+++ b/book/src/builders.md
@@ -201,6 +201,8 @@ else:
    use local payload
 ```
 
+If you would like to always use the builder payload, you can add the flag `--always-prefer-builder-payload` to the beacon node.
+
 ## Checking your builder config
 
 You can check that your builder is configured correctly by looking for these log messages.
diff --git a/book/src/checkpoint-sync.md b/book/src/checkpoint-sync.md
index d5c8b18e57..0c375a5f00 100644
--- a/book/src/checkpoint-sync.md
+++ b/book/src/checkpoint-sync.md
@@ -48,6 +48,17 @@ The Ethereum community provides various [public endpoints](https://eth-clients.g
 lighthouse bn --checkpoint-sync-url https://example.com/ ...
 ```
 
+### Adjusting the timeout
+
+If the beacon node fails to start due to a timeout from the checkpoint sync server, you can try
+running it again with a longer timeout by adding the flag `--checkpoint-sync-url-timeout`.
+
+```
+lighthouse bn --checkpoint-sync-url-timeout 300 --checkpoint-sync-url https://example.com/ ...
+```
+
+The flag takes a value in seconds. For more information see `lighthouse bn --help`.
+
 ## Backfilling Blocks
 
 Once forwards sync completes, Lighthouse will commence a "backfill sync" to download the blocks
@@ -64,7 +75,7 @@ Once backfill is complete, a `INFO Historical block download complete` log will
 
 > Note: Since [v4.1.0](https://github.com/sigp/lighthouse/releases/tag/v4.1.0), Lighthouse implements rate-limited backfilling to mitigate validator performance issues after a recent checkpoint sync. This means that the speed at which historical blocks are downloaded is limited, typically to less than 20 slots/sec. This will not affect validator performance. However, if you would still prefer to sync the chain as fast as possible, you can add the flag `--disable-backfill-rate-limiting` to the beacon node.
 
-> Note: Since [v4.2.0](https://github.com/sigp/lighthouse/releases/tag/v4.2.0), Lighthouse limits the backfill sync to only sync backwards to the weak subjectivity point (approximately 5 months). This will help to save disk space. However, if you would like to sync back to the genesis, you can add the flag `--genesis-backfill` to the beacon node.   
+> Note: Since [v4.2.0](https://github.com/sigp/lighthouse/releases/tag/v4.2.0), Lighthouse limits the backfill sync to only sync backwards to the weak subjectivity point (approximately 5 months). This will help to save disk space. However, if you would like to sync back to the genesis, you can add the flag `--genesis-backfill` to the beacon node.
 
 ## FAQ
 
@@ -105,8 +116,9 @@ states:
   database. Additionally, the genesis block is always available.
 * `state_lower_limit`: All states with slots _less than or equal to_ this value are available in
   the database. The minimum value is 0, indicating that the genesis state is always available.
-* `state_upper_limit`: All states with slots _greater than or equal to_ this value are available
-  in the database.
+* `state_upper_limit`: All states with slots _greater than or equal to_ `min(split.slot,
+  state_upper_limit)` are available in the database. In the case where the `state_upper_limit` is
+  higher than the `split.slot`, this means states are not being written to the freezer database.
 
 Reconstruction runs from the state lower limit to the upper limit, narrowing the window of
 unavailable states as it goes. It will log messages like the following to show its progress:
@@ -142,18 +154,8 @@ To manually specify a checkpoint use the following two flags:
 * `--checkpoint-state`: accepts an SSZ-encoded `BeaconState` blob
 * `--checkpoint-block`: accepts an SSZ-encoded `SignedBeaconBlock` blob
 
-_Both_ the state and block must be provided and **must** adhere to the [Alignment
-Requirements](#alignment-requirements) described below.
-
-### Alignment Requirements
-
-* The block must be a finalized block from an epoch boundary, i.e. `block.slot() % 32 == 0`.
-* The state must be the state corresponding to `block` with `state.slot() == block.slot()`
-  and `state.hash_tree_root() == block.state_root()`.
-
-These requirements are imposed to align with Lighthouse's database schema, and notably exclude
-finalized blocks from skipped slots. You can avoid alignment issues by using
-[Automatic Checkpoint Sync](#automatic-checkpoint-sync), which will search for a suitable block
-and state pair.
+_Both_ the state and block must be provided and the state **must** match the block. The
+state may be from the same slot as the block (unadvanced), or advanced to an epoch boundary,
+in which case it will be assumed to be finalized at that epoch.
 
 [weak-subj]: https://blog.ethereum.org/2014/11/25/proof-stake-learned-love-weak-subjectivity/
diff --git a/book/src/faq.md b/book/src/faq.md
index d3e25438a7..15c5757064 100644
--- a/book/src/faq.md
+++ b/book/src/faq.md
@@ -10,6 +10,8 @@
 - [My beacon node logs `WARN BlockProcessingFailure outcome: MissingBeaconBlock`, what should I do?](#bn-missing-beacon)
 - [After checkpoint sync, the progress of `downloading historical blocks` is slow. Why?](#bn-download-slow)
 - [My beacon node logs `WARN Error processing HTTP API request`, what should I do?](#bn-http)
+- [My beacon node logs `WARN Error signalling fork choice waiter`, what should I do?](#bn-fork-choice)
+- [My beacon node logs `ERRO Aggregate attestation queue full`, what should I do?](#bn-queue-full)
 
 ## [Validator](#validator-1)
 - [Why does it take so long for a validator to be activated?](#vc-activation)
@@ -30,7 +32,7 @@
 - [My beacon node and validator client are on different servers. How can I point the validator client to the beacon node?](#net-bn-vc)
 - [Should I do anything to the beacon node or validator client settings if I have a relocation of the node / change of IP address?](#net-ip)
 - [How to change the TCP/UDP port 9000 that Lighthouse listens on?](#net-port)
-
+- [Lighthouse `v4.3.0` introduces a change where a node will subscribe to only 2 subnets in total. I am worried that this will impact my validators return.](#net-subnet)
 
 ## [Miscellaneous](#miscellaneous-1)
 - [What should I do if I lose my slashing protection database?](#misc-slashing)
@@ -74,7 +76,7 @@ The `WARN Execution engine called failed` log is shown when the beacon node cann
 
 `error: Reqwest(reqwest::Error { kind: Request, url: Url { scheme: "http", cannot_be_a_base: false, username: "", password: None, host: Some(Ipv4(127.0.0.1)), port: Some(8551), path: "/", query: None, fragment: None }, source: TimedOut }), service: exec`
 
-which says `TimedOut` at the end of the message. This means that the execution engine has not responded in time to the beacon node. One option is to add the flag `--execution-timeout-multiplier 3` to the beacon node. However, if the error persists, it is worth digging further to find out the cause. There are a few reasons why this can occur:
+which says `TimedOut` at the end of the message. This means that the execution engine has not responded in time to the beacon node. One option is to add the flags `--execution-timeout-multiplier 3` and `--disable-lock-timeouts` to the beacon node. However, if the error persists, it is worth digging further to find out the cause. There are a few reasons why this can occur:
 1. The execution engine is not synced. Check the log of the execution engine to make sure that it is synced. If it is syncing, wait until it is synced and the error will disappear. You will see the beacon node logs `INFO Execution engine online` when it is synced. 
 1. The computer is overloaded. Check the CPU and RAM usage to see if it has overloaded. You can use `htop` to check for CPU and RAM usage.
 1. Your SSD is slow. Check if your SSD is in "The Bad" list [here](https://gist.github.com/yorickdowne/f3a3e79a573bf35767cd002cc977b038). If your SSD is in "The Bad" list, it means it cannot keep in sync to the network and you may want to consider upgrading to a better SSD.
@@ -170,6 +172,27 @@ ERRO Failed to download attester duties      err: FailedToDownloadAttesters("Som
 
 This means that the validator client is sending requests to the beacon node. However, as the beacon node is still syncing, it is therefore unable to fulfil the request. The error will disappear once the beacon node is synced. 
 
+### <a name="bn-fork-choice"></a> My beacon node logs `WARN Error signalling fork choice waiter`, what should I do?
+
+An example of the full log is shown below:
+
+```
+WARN Error signalling fork choice waiter slot: 6763073, error: ForkChoiceSignalOutOfOrder { current: Slot(6763074), latest: Slot(6763073) }, service: state_advance
+```
+
+This suggests that the computer resources are being overwhelmed. It could be due to high CPU usage or high disk I/O usage. This can happen, e.g., when the beacon node is downloading historical blocks, or when the execution client is syncing. The error will disappear when the resources used return to normal or when the node is synced.
+
+
+### <a name="bn-queue-full"></a> My beacon node logs `ERRO Aggregate attestation queue full`, what should I do?
+
+An example of the full log is shown below:
+```
+ERRO Aggregate attestation queue full, queue_len: 4096, msg: the system has insufficient resources for load, module: network::beacon_processor:1542
+```
+
+This suggests that the computer resources are being overwhelmed. It could be due to high CPU usage or high disk I/O usage. This can happen, e.g., when the beacon node is downloading historical blocks, or when the execution client is syncing. The error will disappear when the resources used return to normal or when the node is synced.
+
+
 ## Validator
 
 ### <a name="vc-activation"></a> Why does it take so long for a validator to be activated?
@@ -279,12 +302,26 @@ The first thing is to ensure both consensus and execution clients are synced wit
 - the internet is working well
 - you have sufficient peers
 
-You can see more information on the [Ethstaker KB](https://ethstaker.gitbook.io/ethstaker-knowledge-base/help/missed-attestations). Once the above points are good, missing attestation should be a rare occurrence. 
+You can see more information on the [Ethstaker KB](https://ethstaker.gitbook.io/ethstaker-knowledge-base/help/missed-attestations). 
+
+Another cause for missing attestations is delays during block processing. When this happens, the debug logs will show (debug logs can be found under `$datadir/beacon/logs`):
+
+```
+DEBG Delayed head block                      set_as_head_delay: Some(93.579425ms), imported_delay: Some(1.460405278s), observed_delay: Some(2.540811921s), block_delay: 4.094796624s, slot: 6837344, proposer_index: 211108, block_root: 0x2c52231c0a5a117401f5231585de8aa5dd963bc7cbc00c544e681342eedd1700, service: beacon
+```
+
+The fields to look for are `imported_delay > 1s` and `observed_delay < 3s`. The `imported_delay` is how long the node took to process the block. The `imported_delay` of larger than 1 second suggests that there is slowness in processing the block. It could be due to high CPU usage, high I/O disk usage or the clients are doing some background maintenance processes. The `observed_delay` is determined mostly by the proposer and partly by your networking setup (e.g., how long it took for the node to receive the block). The `observed_delay` of less than 3 seconds means that the block is not arriving late from the block proposer. Combining the above, this implies that the validator should have been able to attest to the block, but failed due to slowness in the node processing the block. 
+
 
 ### <a name="vc-head-vote"></a> Sometimes I miss the attestation head vote, resulting in penalty. Is this normal?
 
 In general, it is unavoidable to have some penalties occasionally. This is particularly the case when you are assigned to attest on the first slot of an epoch and if the proposer of that slot releases the block late, then you will get penalised for missing the target and head votes. Your attestation performance does not only depend on your own setup, but also on everyone elses performance.
 
+You could also check for the sync aggregate participation percentage on block explorers such as [beaconcha.in](https://beaconcha.in/). A low sync aggregate participation percentage (e.g., 60-70%) indicates that the block that you are assigned to attest to may be published late. As a result, your validator fails to correctly attest to the block. 
+
+Another possible reason for missing the head vote is due to a chain "reorg". A reorg can happen if the proposer publishes block `n` late, and the proposer of block `n+1` builds upon block `n-1` instead of `n`. This is called a "reorg". Due to the reorg, block `n` was never included in the chain.  If you are assigned to attest at slot `n`, it is possible you may still attest to block `n` despite most of the network recognizing the block as being late. In this case you will miss the head reward.
+
+
 ### <a name="vc-exit"></a> Can I submit a voluntary exit message without running a beacon node?
 
 Yes. Beaconcha.in provides the tool to broadcast the message. You can create the voluntary exit message file with [ethdo](https://github.com/wealdtech/ethdo/releases/tag/v1.30.0) and submit the message via the [beaconcha.in](https://beaconcha.in/tools/broadcast) website. A guide on how to use `ethdo` to perform voluntary exit can be found [here](https://github.com/eth-educators/ethstaker-guides/blob/main/voluntary-exit.md).
@@ -425,6 +462,14 @@ No. Lighthouse will auto-detect the change and update your Ethereum Node Record
 ### <a name="net-port"></a> How to change the TCP/UDP port 9000 that Lighthouse listens on?
 Use the flag ```--port <PORT>``` in the beacon node. This flag can be useful when you are running two beacon nodes at the same time. You can leave one beacon node as the default port 9000, and configure the second beacon node to listen on, e.g., ```--port 9001```.
 
+### <a name="net-subnet"></a> Lighthouse `v4.3.0` introduces a change where a node will subscribe to only 2 subnets in total. I am worried that this will impact my validators return.
+
+Previously, having more validators means subscribing to more subnets. Since the change, a node will now only subscribe to 2 subnets in total. This will bring about significant reductions in bandwidth for nodes with multiple validators. 
+
+While subscribing to more subnets can ensure you have peers on a wider range of subnets, these subscriptions consume resources and bandwidth. This does not significantly increase the performance of the node, however it does benefit other nodes on the network. 
+ 
+If you would still like to subscribe to all subnets, you can use the flag `subscribe-all-subnets`. This may improve the block rewards by 1-5%, though it comes at the cost of a much higher bandwidth requirement.
+
 ## Miscellaneous
 
 ### <a name="misc-slashing"></a> What should I do if I lose my slashing protection database?
diff --git a/book/src/installation-source.md b/book/src/installation-source.md
index 1504b7ff0f..58e6917eca 100644
--- a/book/src/installation-source.md
+++ b/book/src/installation-source.md
@@ -28,7 +28,7 @@ operating system.
 Install the following packages:
 
 ```bash
-sudo apt install -y git gcc g++ make cmake pkg-config llvm-dev libclang-dev clang protobuf-compiler
+sudo apt install -y git gcc g++ make cmake pkg-config llvm-dev libclang-dev clang
 ```
 
 > Tips:
@@ -51,10 +51,6 @@ After this, you are ready to [build Lighthouse](#build-lighthouse).
 brew install cmake
 ```
 
-1. Install protoc using Homebrew:
-```
-brew install protobuf
-```
 
 [Homebrew]: https://brew.sh/
 
@@ -71,7 +67,7 @@ After this, you are ready to [build Lighthouse](#build-lighthouse).
     Set-ExecutionPolicy Bypass -Scope Process -Force; [System.Net.ServicePointManager]::SecurityProtocol = [System.Net.ServicePointManager]::SecurityProtocol -bor 3072; iex ((New-Object System.Net.WebClient).DownloadString('https://community.chocolatey.org/install.ps1'))
     ```
     > - To verify that Chocolatey is ready, run `choco` and it should return the version.
-1. Install Make, CMake, LLVM and protoc using Chocolatey:
+1. Install Make, CMake and LLVM using Chocolatey:
 
 ```
 choco install make
@@ -85,10 +81,6 @@ choco install cmake --installargs 'ADD_CMAKE_TO_PATH=System'
 choco install llvm
 ```
 
-```
-choco install protoc
-```
-
 These dependencies are for compiling Lighthouse natively on Windows. Lighthouse can also run
 successfully under the [Windows Subsystem for Linux (WSL)][WSL]. If using Ubuntu under WSL, you
 should follow the instructions for Ubuntu listed in the [Dependencies (Ubuntu)](#ubuntu) section.
@@ -217,4 +209,3 @@ look into [cross compilation](./cross-compiling.md), or use a [pre-built
 binary](https://github.com/sigp/lighthouse/releases).
 
 If compilation fails with `error: linking with cc failed: exit code: 1`, try running `cargo clean`.
-
diff --git a/book/src/key-management.md b/book/src/key-management.md
index cebd84649d..b2bb7737fd 100644
--- a/book/src/key-management.md
+++ b/book/src/key-management.md
@@ -1,9 +1,30 @@
-# Key Management
+# Key Management (Deprecated)
 
 [launchpad]: https://launchpad.ethereum.org/
 
->
-> **Note: While Lighthouse is able to generate the validator keys and the deposit data file to submit to the deposit contract, we strongly recommend using the [staking-deposit-cli](https://github.com/ethereum/staking-deposit-cli) to create validators keys and the deposit data file. This is because the [staking-deposit-cli](https://github.com/ethereum/staking-deposit-cli) has the option to assign a withdrawal address during the key generation process, while Lighthouse wallet will always generate keys with withdrawal credentials of type 0x00. This means that users who created keys using Lighthouse will have to update their withdrawal credentials in the future to enable withdrawals. In addition, Lighthouse generates the deposit data file in the form of `*.rlp`, which cannot be uploaded to the [Staking launchpad][launchpad] that accepts only `*.json` file. This means that users have to directly interact with the deposit contract to be able to submit the deposit if they were to generate the files using Lighthouse.**
+**⚠️ The information on this page refers to tooling and process that have been deprecated. Please read the "Deprecation Notice". ⚠️**
+
+## Deprecation Notice
+
+This page recommends the use of the `lighthouse account-manager` tool to create
+validators. This tool will always generate keys with the withdrawal credentials
+of type `0x00`. This means the users who created keys using `lighthouse
+account-manager` will have to update their withdrawal credentials in a
+separate step to receive staking rewards.
+
+In addition, Lighthouse generates the deposit data file in the form of `*.rlp`,
+which cannot be uploaded to the [Staking launchpad][launchpad] that accepts only
+`*.json` file. This means that users have to directly interact with the deposit
+contract to be able to submit the deposit if they were to generate the files
+using Lighthouse.
+
+Rather than continuing to read this page, we recommend users visit either:
+
+- The [Staking Launchpad][launchpad] for detailed, beginner-friendly instructions.
+- The [staking-deposit-cli](https://github.com/ethereum/staking-deposit-cli) for a CLI tool used by the [Staking Launchpad][launchpad].
+- The [validator-manager documentation](./validator-manager.md) for a Lighthouse-specific tool for streamlined validator management tools.
+
+## The `lighthouse account-manager`
 
 Lighthouse uses a _hierarchical_ key management system for producing validator
 keys. It is hierarchical because each validator key can be _derived_ from a
diff --git a/book/src/merge-migration.md b/book/src/merge-migration.md
index acca0bbeb3..bab520b569 100644
--- a/book/src/merge-migration.md
+++ b/book/src/merge-migration.md
@@ -21,7 +21,7 @@ engine to a merge-ready version.
 
 ## When?
 
-All networks (**Mainnet**, **Goerli (Prater)**, **Ropsten**, **Sepolia**, **Kiln**, **Gnosis**) have successfully undergone the Bellatrix fork and transitioned to a post-merge Network. Your node must have a merge-ready configuration to continue operating. Table below lists the date at which Bellatrix and The Merge occurred:
+All networks (**Mainnet**, **Goerli (Prater)**, **Ropsten**, **Sepolia**, **Kiln**, **Chiado**, **Gnosis**) have successfully undergone the Bellatrix fork and transitioned to a post-merge Network. Your node must have a merge-ready configuration to continue operating. Table below lists the date at which Bellatrix and The Merge occurred:
 
 <div align="center">
 
@@ -31,6 +31,7 @@ All networks (**Mainnet**, **Goerli (Prater)**, **Ropsten**, **Sepolia**, **Kiln
 | Sepolia            |   20<sup>th</sup> June 2022   | 6<sup>th</sup> July 2022 | |
 | Goerli | 4<sup>th</sup> August 2022 | 10<sup>th</sup> August 2022 | Previously named `Prater`|
 | Mainnet | 6<sup>th</sup> September 2022  |  15<sup>th</sup> September 2022 |
+| Chiado | 10<sup>th</sup> October 2022 | 4<sup>th</sup> November 2022 |
 | Gnosis| 30<sup>th</sup> November 2022 | 8<sup>th</sup> December 2022
 
 </div>
diff --git a/book/src/pi.md b/book/src/pi.md
index d8d154d765..550415240b 100644
--- a/book/src/pi.md
+++ b/book/src/pi.md
@@ -22,7 +22,7 @@ terminal and an Internet connection are necessary.
 Install the Ubuntu dependencies:
 
 ```bash
-sudo apt install -y git gcc g++ make cmake pkg-config llvm-dev libclang-dev clang protobuf-compiler
+sudo apt install -y git gcc g++ make cmake pkg-config llvm-dev libclang-dev clang
 ```
 
 > Tips:
diff --git a/book/src/run_a_node.md b/book/src/run_a_node.md
index a31aedf785..1ea1427335 100644
--- a/book/src/run_a_node.md
+++ b/book/src/run_a_node.md
@@ -58,7 +58,8 @@ Notable flags:
   - `lighthouse --network mainnet`: Mainnet.
   - `lighthouse --network goerli`: Goerli (testnet).
   - `lighthouse --network sepolia`: Sepolia (testnet).
-  - `lighthouse --network gnosis`: Gnosis chain
+  - `lighthouse --network chiado`: Chiado (testnet).
+  - `lighthouse --network gnosis`: Gnosis chain.
 
     > Note:  Using the correct `--network` flag is very important; using the wrong flag can
 result in penalties, slashings or lost deposits. As a rule of thumb, *always*
diff --git a/book/src/setup.md b/book/src/setup.md
index ea3c5664ac..1ae6e63540 100644
--- a/book/src/setup.md
+++ b/book/src/setup.md
@@ -9,13 +9,11 @@ particularly useful for development but still a good way to ensure you have the
 base dependencies.
 
 The additional requirements for developers are:
-- [`anvil`](https://github.com/foundry-rs/foundry/tree/master/anvil). This is used to
+- [`anvil`](https://github.com/foundry-rs/foundry/tree/master/crates/anvil). This is used to
   simulate the execution chain during tests. You'll get failures during tests if you
   don't have `anvil` available on your `PATH`.
 - [`cmake`](https://cmake.org/cmake/help/latest/command/install.html). Used by
   some dependencies. See [`Installation Guide`](./installation.md) for more info.
-- [`protoc`](https://github.com/protocolbuffers/protobuf/releases) required for
-  the networking stack.
 - [`java 11 runtime`](https://openjdk.java.net/projects/jdk/). 11 is the minimum,
   used by web3signer_tests.
 - [`libpq-dev`](https://www.postgresql.org/docs/devel/libpq.html). Also know as
diff --git a/book/src/validator-doppelganger.md b/book/src/validator-doppelganger.md
index 7ce2868e9b..b62086d4bf 100644
--- a/book/src/validator-doppelganger.md
+++ b/book/src/validator-doppelganger.md
@@ -46,6 +46,8 @@ Staying silent and refusing to sign messages will cause the following:
 - Potentially missed rewards by missing a block proposal (if the validator is an elected block
     proposer, which is unlikely).
 
+Notably, sync committee contributions are not slashable and will continue to be produced even when DP is suppressing other messages.
+
 The loss of rewards and penalties incurred due to the missed duties will be very small in
 dollar-values. Neglecting block proposals, generally they will equate to around 0.00002 ETH (equivalent to USD 0.04 assuming ETH is trading at USD 2000), or less than
 1% of the reward for one validator for one day. Since DP costs so little but can protect a user from
diff --git a/book/src/validator-management.md b/book/src/validator-management.md
index be34fef2c3..df7c2ac476 100644
--- a/book/src/validator-management.md
+++ b/book/src/validator-management.md
@@ -13,6 +13,10 @@ standard directories and do not start their `lighthouse vc` with the
 this document. However, users with more complex needs may find this document
 useful.
 
+The [lighthouse validator-manager](./validator-manager.md) command can be used
+to create and import validators to a Lighthouse VC. It can also be used to move
+validators between two Lighthouse VCs.
+
 ## Introducing the `validator_definitions.yml` file
 
 The `validator_definitions.yml` file is located in the `validator-dir`, which
diff --git a/book/src/validator-manager-create.md b/book/src/validator-manager-create.md
new file mode 100644
index 0000000000..779c159276
--- /dev/null
+++ b/book/src/validator-manager-create.md
@@ -0,0 +1,206 @@
+# Creating and Importing Validators
+
+[Ethereum Staking Launchpad]: https://launchpad.ethereum.org/en/
+
+The `lighthouse validator-manager create` command derives validators from a
+mnemonic and produces two files:
+
+- `validators.json`: the keystores and passwords for the newly generated
+    validators, in JSON format.
+- `deposits.json`: a JSON file of the same format as
+    [staking-deposit-cli](https://github.com/ethereum/staking-deposit-cli) which can
+    be used for deposit submission via the [Ethereum Staking
+    Launchpad][].
+
+The `lighthouse validator-manager import` command accepts a `validators.json`
+file (from the `create` command) and submits those validators to a running
+Lighthouse Validator Client via the HTTP API.
+
+These two commands enable a workflow of:
+
+1. Creating the validators via the `create` command.
+1. Importing the validators via the `import` command.
+1. Depositing validators via the [Ethereum Staking
+    Launchpad][].
+
+The separation of the `create` and `import` commands allows for running the
+`create` command on an air-gapped host whilst performing the `import` command on
+an internet-connected host.
+
+The `create` and `import` commands are recommended for advanced users who are
+familiar with command line tools and the practicalities of managing sensitive
+cryptographic material. **We recommend that novice users follow the workflow on
+[Ethereum Staking Launchpad][] rather than using the `create` and `import`
+commands.**
+
+## Simple Example
+
+Create validators from a mnemonic with:
+
+```bash
+lighthouse \
+    validator-manager \
+    create \
+    --network mainnet \
+    --first-index 0 \
+    --count 2 \
+    --eth1-withdrawal-address <ADDRESS> \
+    --suggested-fee-recipient <ADDRESS> \
+    --output-path ./
+```
+> If the flag `--first-index` is not provided, it will default to using index 0.
+> The `--suggested-fee-recipient` flag may be omitted to use whatever default
+> value the VC uses. It does not necessarily need to be identical to
+> `--eth1-withdrawal-address`.
+> The command will create the `deposits.json` and `validators.json` in the present working directory. If you would like these files to be created in a different directory, change the value of `output-path`, for example `--output-path /desired/directory`. The directory will be created if the path does not exist.
+
+Then, import the validators to a running VC with:
+
+```bash
+lighthouse \
+    validator-manager \
+    import \
+    --validators-file validators.json \
+    --vc-token <API-TOKEN-PATH>
+```
+> This is assuming that `validators.json` is in the present working directory. If it is not, insert the directory of the file.
+> Be sure to remove `./validators.json` after the import is successful since it
+> contains unencrypted validator keystores.
+
+## Detailed Guide
+
+This guide will create two validators and import them to a VC. For simplicity,
+the same host will be used to generate the keys and run the VC. In reality,
+users may want to perform the `create` command on an air-gapped machine and then
+move the `validators.json` and `deposits.json` files to an Internet-connected
+host. This would help protect the mnemonic from being exposed to the Internet.
+
+### 1. Create the Validators
+
+Run the `create` command, substituting `<ADDRESS>` for an execution address that
+you control. This is where all the staked ETH and rewards will ultimately
+reside, so it's very important that this address is secure, accessible and
+backed-up. The `create` command:
+
+```bash
+lighthouse \
+    validator-manager \
+    create \
+    --first-index 0 \
+    --count 2 \
+    --eth1-withdrawal-address <ADDRESS> \
+    --output-path ./
+```
+
+If successful, the command output will appear like below:
+
+```bash
+Running validator manager for mainnet network
+
+Enter the mnemonic phrase:
+<REDACTED>
+Valid mnemonic provided.
+
+Starting derivation of 2 keystores. Each keystore may take several seconds.
+Completed 1/2: 0x8885c29b8f88ee9b9a37b480fd4384fed74bda33d85bc8171a904847e65688b6c9bb4362d6597fd30109fb2def6c3ae4
+Completed 2/2: 0xa262dae3dcd2b2e280af534effa16bedb27c06f2959e114d53bd2a248ca324a018dc73179899a066149471a94a1bc92f
+Keystore generation complete
+Writing "./validators.json"
+Writing "./deposits.json"
+```
+
+This command will create validators at indices `0, 1`. The exact indices created
+can be influenced with the `--first-index` and `--count` flags. Use these flags
+with caution to prevent creating the same validator twice, this may result in a
+slashing!
+
+The command will create two files:
+
+- `./deposits.json`: this file does *not* contain sensitive information and may be uploaded to the [Ethereum Staking Launchpad].
+- `./validators.json`: this file contains **sensitive unencrypted validator keys, do not share it with anyone or upload it to any website**.
+
+### 2. Import the validators
+
+The VC which will receive the validators needs to have the following flags at a minimum:
+
+- `--http`
+- `--http-port 5062`
+- `--enable-doppelganger-protection`
+
+Therefore, the VC command might look like:
+
+```bash
+lighthouse \
+    vc \
+    --http \
+    --http-port 5062 \
+    --enable-doppelganger-protection
+```
+
+In order to import the validators, the location of the VC `api-token.txt` file
+must be known. The location of the file varies, but it is located in the
+"validator directory" of your data directory. For example:
+`~/.lighthouse/mainnet/validators/api-token.txt`. We will use `<API-TOKEN-PATH>`
+to subsitute this value. If you are unsure of the `api-token.txt` path, you can run `curl http://localhost:5062/lighthouse/auth` which will show the path.
+
+
+Once the VC is running, use the `import` command to import the validators to the VC:
+
+```bash
+lighthouse \
+    validator-manager \
+    import \
+    --validators-file validators.json \
+    --vc-token <API-TOKEN-PATH>
+```
+
+If successful, the command output will appear like below:
+
+```bash
+Running validator manager for mainnet network
+Validator client is reachable at http://localhost:5062/ and reports 0 validators
+Starting to submit 2 validators to VC, each validator may take several seconds
+Uploaded keystore 1 of 2 to the VC
+Uploaded keystore 2 of 2 to the VC
+```
+
+The user should now *securely* delete the `validators.json` file (e.g., `shred -u validators.json`).
+The `validators.json` contains the unencrypted validator keys and must not be
+shared with anyone.
+At the same time, `lighthouse vc` will log:
+```bash
+INFO Importing keystores via standard HTTP API, count: 1
+WARN No slashing protection data provided with keystores
+INFO Enabled validator                       voting_pubkey: 0xab6e29f1b98fedfca878edce2b471f1b5ee58ee4c3bd216201f98254ef6f6eac40a53d74c8b7da54f51d3e85cacae92f, signing_method: local_keystore
+INFO Modified key_cache saved successfully
+```
+The WARN message means that the `validators.json` file does not contain the slashing protection data. This is normal if you are starting a new validator. The flag `--enable-doppelganger-protection` will also protect users from potential slashing risk. 
+The validators will now go through 2-3 epochs of [doppelganger
+protection](./validator-doppelganger.md) and will automatically start performing
+their duties when they are deposited and activated. 
+
+If the host VC contains the same public key as the `validators.json` file, an error will be shown and the `import` process will stop:
+
+```bash
+Duplicate validator   0xab6e29f1b98fedfca878edce2b471f1b5ee58ee4c3bd216201f98254ef6f6eac40a53d74c8b7da54f51d3e85cacae92f already exists on the destination validator client. This may indicate that some validators are running in two places at once, which can lead to slashing. If you are certain that there is no risk, add the --ignore-duplicates flag.
+Err(DuplicateValidator(0xab6e29f1b98fedfca878edce2b471f1b5ee58ee4c3bd216201f98254ef6f6eac40a53d74c8b7da54f51d3e85cacae92f))
+```
+
+If you are certain that it is safe, you can add the flag `--ignore-duplicates` in the `import` command. The command becomes:
+
+```bash
+lighthouse \
+    validator-manager \
+    import \
+    --validators-file validators.json \
+    --vc-token <API-TOKEN-PATH> \
+    --ignore-duplicates
+```
+and the output will be as follows:
+
+```bash
+Duplicate validators are ignored, ignoring 0xab6e29f1b98fedfca878edce2b471f1b5ee58ee4c3bd216201f98254ef6f6eac40a53d74c8b7da54f51d3e85cacae92f which exists on the destination validator client
+Re-uploaded keystore 1 of 6 to the VC
+```
+
+The guide is complete.
\ No newline at end of file
diff --git a/book/src/validator-manager-move.md b/book/src/validator-manager-move.md
new file mode 100644
index 0000000000..98932604d5
--- /dev/null
+++ b/book/src/validator-manager-move.md
@@ -0,0 +1,188 @@
+# Moving Validators
+
+The `lighthouse validator-manager move` command uses the VC HTTP API to move
+validators from one VC (the "src" VC) to another VC (the "dest" VC). The move
+operation is *comprehensive*; it will:
+
+- Disable the validators on the src VC.
+- Remove the validator keystores from the src VC file system.
+- Export the slashing database records for the appropriate validators from the src VC to the dest VC.
+- Enable the validators on the dest VC.
+- Generally result in very little or no validator downtime.
+
+It is capable of moving all validators on the src VC, a count of validators or
+a list of pubkeys.
+
+The `move` command is only guaranteed to work between two Lighthouse VCs (i.e.,
+there is no guarantee that the commands will work between Lighthouse and Teku, for instance).
+
+The `move` command only supports moving validators using a keystore on the local
+file system, it does not support `Web3Signer` validators.
+
+Although all efforts are taken to avoid it, it's possible for the `move` command
+to fail in a way that removes the validator from the src VC without adding it to the
+dest VC. Therefore, it is recommended to **never use the `move` command without
+having a backup of all validator keystores (e.g. the mnemonic).**
+
+## Simple Example
+
+The following command will move all validators from the VC running at
+`http://localhost:6062` to the VC running at `http://localhost:5062`.
+
+```bash
+lighthouse \
+	validator-manager \
+	move \
+	--src-vc-url http://localhost:6062 \
+	--src-vc-token ~/src-token.txt \
+	--dest-vc-url http://localhost:5062 \
+	--dest-vc-token ~/.lighthouse/mainnet/validators/api-token.txt \
+	--validators all
+```
+
+## Detailed Guide
+
+This guide describes the steps to move validators between two validator clients (VCs) which are
+able to SSH between each other. This guide assumes experience with the Linux command line and SSH
+connections.
+
+There will be two VCs in this example:
+
+- The *source* VC which contains the validators/keystores to be moved.
+- The *destination* VC which is to take the validators/keystores from the source.
+
+There will be two hosts in this example:
+
+- Host 1 (*"source host"*): Is running the `src-vc`.
+- Host 2 (*"destination host"*): Is running the `dest-vc`.
+
+The example assumes
+that Host 1 is able to SSH to Host 2.
+
+In reality, many host configurations are possible. For example:
+
+- Both VCs on the same host.
+- Both VCs on different hosts and the `validator-manager` being used on a third host.
+
+### 1. Configure the Source VC
+
+The source VC needs to have the following flags at a minimum:
+
+- `--http`
+- `--http-port 5062`
+- `--http-allow-keystore-export`
+
+Therefore, the source VC command might look like:
+
+```bash
+lighthouse \
+    vc \
+    --http \
+    --http-port 5062 \
+    --http-allow-keystore-export
+```
+
+### 2. Configure the Destination VC
+
+The destination VC needs to have the following flags at a minimum:
+
+- `--http`
+- `--http-port 5062`
+- `--enable-doppelganger-protection`
+
+Therefore, the destination VC command might look like:
+
+```bash
+lighthouse \
+    vc \
+    --http \
+    --http-port 5062 \
+    --enable-doppelganger-protection
+```
+
+> The `--enable-doppelganger-protection` flag is not *strictly* required, however
+> it is recommended for an additional layer of safety. It will result in 2-3
+> epochs of downtime for the validator after it is moved, which is generally an
+> inconsequential cost in lost rewards or penalties.
+> 
+> Optionally, users can add the `--http-store-passwords-in-secrets-dir` flag if they'd like to have
+> the import validator keystore passwords stored in separate files rather than in the
+> `validator-definitions.yml` file. If you don't know what this means, you can safely omit the flag.
+
+### 3. Obtain the Source API Token
+
+The VC API is protected by an *API token*. This is stored in a file on each of the hosts. Since
+we'll be running our command on the destination host, it will need to have the API token for the
+source host on its file-system.
+
+On the **source host**, find the location of the `api-token.txt` file and copy the contents. The
+location of the file varies, but it is located in the "validator directory" of your data directory,
+alongside validator keystores. For example: `~/.lighthouse/mainnet/validators/api-token.txt`. If you are unsure of the `api-token.txt` path, you can run `curl http://localhost:5062/lighthouse/auth` which will show the path.
+
+Copy the contents of that file into a new file on the **destination host** at `~/src-token.txt`. The
+API token should be similar to `api-token-0x03eace4c98e8f77477bb99efb74f9af10d800bd3318f92c33b719a4644254d4123`.
+
+### 4. Create an SSH Tunnel
+
+In the **source host**, open a terminal window, SSH to the **destination host** and establish a reverse-SSH connection
+between the **destination host** and the **source host**.
+
+```bash
+ssh dest-host
+ssh -L 6062:localhost:5062 src-host
+```
+
+It's important that you leave this session open throughout the rest of this tutorial. If you close
+this terminal window then the connection between the destination and source host will be lost.
+
+### 5. Move
+
+With the SSH tunnel established between the `dest-host` and `src-host`, from the **destination
+host** run the command to move the validators:
+
+```bash
+lighthouse \
+	validator-manager \
+	move \
+	--src-vc-url http://localhost:6062 \
+	--src-vc-token ~/src-token.txt \
+	--dest-vc-url http://localhost:5062 \
+	--dest-vc-token ~/.lighthouse/mainnet/validators/api-token.txt \
+	--validators all
+```
+
+The command will provide information about the progress of the operation and
+emit `Done.` when the operation has completed successfully. For example:
+
+```bash
+Running validator manager for mainnet network
+Validator client is reachable at http://localhost:5062/ and reports 2 validators
+Validator client is reachable at http://localhost:6062/ and reports 0 validators
+Moved keystore 1 of 2
+Moved keystore 2 of 2
+Done.
+```
+At the same time, `lighthouse vc` will log:
+```bash
+INFO Importing keystores via standard HTTP API, count: 1
+INFO Enabled validator                       voting_pubkey: 0xab6e29f1b98fedfca878edce2b471f1b5ee58ee4c3bd216201f98254ef6f6eac40a53d74c8b7da54f51d3e85cacae92f, signing_method: local_keystore
+INFO Modified key_cache saved successfully
+Once the operation completes successfully, there is nothing else to be done. The
+validators have been removed from the `src-host` and enabled at the `dest-host`.
+If the `--enable-doppelganger-protection` flag was used it may take 2-3 epochs
+for the validators to start attesting and producing blocks on the `dest-host`.
+If you would only like to move some validators, you can replace the flag `--validators all` with one or more validator public keys. For example:
+
+```bash
+lighthouse \
+	validator-manager \
+	move \
+	--src-vc-url http://localhost:6062 \
+	--src-vc-token ~/src-token.txt \
+	--dest-vc-url http://localhost:5062 \
+	--dest-vc-token ~/.lighthouse/mainnet/validators/api-token.txt \
+	--validators 0x9096aab771e44da149bd7c9926d6f7bb96ef465c0eeb4918be5178cd23a1deb4aec232c61d85ff329b54ed4a3bdfff3a,0x90fc4f72d898a8f01ab71242e36f4545aaf87e3887be81632bb8ba4b2ae8fb70753a62f866344d7905e9a07f5a9cdda1
+```
+Any errors encountered during the operation should include information on how to
+proceed. Assistance is also available on our
+[Discord](https://discord.gg/cyAszAh).
\ No newline at end of file
diff --git a/book/src/validator-manager.md b/book/src/validator-manager.md
new file mode 100644
index 0000000000..e3cb74bd66
--- /dev/null
+++ b/book/src/validator-manager.md
@@ -0,0 +1,35 @@
+# Validator Manager
+
+[Ethereum Staking Launchpad]: https://launchpad.ethereum.org/en/
+[Import Validators]: #import-validators
+
+## Introduction
+
+The `lighthouse validator-manager` tool provides utilities for managing validators on a *running*
+Lighthouse Validator Client. The validator manager performs operations via the HTTP API of the
+validator client (VC). Due to limitations of the
+[keymanager-APIs](https://ethereum.github.io/keymanager-APIs/), only Lighthouse VCs are fully
+supported by this command.
+
+The validator manager tool is similar to the `lighthouse account-manager` tool,
+except the latter creates files that will be read by the VC next time it starts
+whilst the former makes instant changes to a live VC.
+
+The `account-manager` is ideal for importing keys created with the
+[staking-deposit-cli](https://github.com/ethereum/staking-deposit-cli). On the
+other hand, the `validator-manager` is ideal for moving existing validators
+between two VCs or for advanced users to create validators at scale with less
+downtime.
+
+The `validator-manager` boasts the following features:
+
+- One-line command to arbitrarily move validators between two VCs, maintaining the slashing protection database.
+- Generates deposit files compatible with the [Ethereum Staking Launchpad][].
+- Generally involves zero or very little downtime.
+- The "key cache" is preserved whenever a validator is added with the validator
+    manager, preventing long waits at start up when a new validator is added.
+
+## Guides
+
+- [Creating and importing validators using the `create` and `import` commands.](./validator-manager-create.md)
+- [Moving validators between two VCs using the `move` command.](./validator-manager-move.md)
\ No newline at end of file
diff --git a/boot_node/Cargo.toml b/boot_node/Cargo.toml
index c3dd3bd193..fcbe8f84d2 100644
--- a/boot_node/Cargo.toml
+++ b/boot_node/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "boot_node"
-version = "4.3.0"
+version = "4.4.1"
 authors = ["Sigma Prime <contact@sigmaprime.io>"]
 edition = "2021"
 
diff --git a/boot_node/src/config.rs b/boot_node/src/config.rs
index c4e36022a8..779269921a 100644
--- a/boot_node/src/config.rs
+++ b/boot_node/src/config.rs
@@ -10,6 +10,7 @@ use lighthouse_network::{
 use serde_derive::{Deserialize, Serialize};
 use ssz::Encode;
 use std::net::{SocketAddrV4, SocketAddrV6};
+use std::time::Duration;
 use std::{marker::PhantomData, path::PathBuf};
 use types::EthSpec;
 
@@ -80,7 +81,7 @@ impl<T: EthSpec> BootNodeConfig<T> {
         }
 
         let private_key = load_private_key(&network_config, &logger);
-        let local_key = CombinedKey::from_libp2p(&private_key)?;
+        let local_key = CombinedKey::from_libp2p(private_key)?;
 
         let local_enr = if let Some(dir) = matches.value_of("network-dir") {
             let network_dir: PathBuf = dir.into();
@@ -90,8 +91,19 @@ impl<T: EthSpec> BootNodeConfig<T> {
             let enr_fork = {
                 let spec = eth2_network_config.chain_spec::<T>()?;
 
-                if eth2_network_config.beacon_state_is_known() {
-                    let genesis_state = eth2_network_config.beacon_state::<T>()?;
+                let genesis_state_url: Option<String> =
+                    clap_utils::parse_optional(matches, "genesis-state-url")?;
+                let genesis_state_url_timeout =
+                    clap_utils::parse_required(matches, "genesis-state-url-timeout")
+                        .map(Duration::from_secs)?;
+
+                if eth2_network_config.genesis_state_is_known() {
+                    let genesis_state = eth2_network_config
+                        .genesis_state::<T>(genesis_state_url.as_deref(), genesis_state_url_timeout, &logger)?
+                        .ok_or_else(|| {
+                            "The genesis state for this network is not known, this is an unsupported mode"
+                                .to_string()
+                        })?;
 
                     slog::info!(logger, "Genesis state found"; "root" => genesis_state.canonical_root().to_string());
                     let enr_fork = spec.enr_fork_id::<T>(
diff --git a/common/account_utils/src/lib.rs b/common/account_utils/src/lib.rs
index 89de380385..e566d7cdda 100644
--- a/common/account_utils/src/lib.rs
+++ b/common/account_utils/src/lib.rs
@@ -13,6 +13,9 @@ use std::fs::{self, File};
 use std::io;
 use std::io::prelude::*;
 use std::path::{Path, PathBuf};
+use std::str::from_utf8;
+use std::thread::sleep;
+use std::time::Duration;
 use zeroize::Zeroize;
 
 pub mod validator_definitions;
@@ -30,6 +33,8 @@ pub const MINIMUM_PASSWORD_LEN: usize = 12;
 /// array of length 32.
 const DEFAULT_PASSWORD_LEN: usize = 48;
 
+pub const MNEMONIC_PROMPT: &str = "Enter the mnemonic phrase:";
+
 /// Returns the "default" path where a wallet should store its password file.
 pub fn default_wallet_password_path<P: AsRef<Path>>(wallet_name: &str, secrets_dir: P) -> PathBuf {
     secrets_dir.as_ref().join(format!("{}.pass", wallet_name))
@@ -59,6 +64,18 @@ pub fn read_password<P: AsRef<Path>>(path: P) -> Result<PlainText, io::Error> {
     fs::read(path).map(strip_off_newlines).map(Into::into)
 }
 
+/// Reads a password file into a `ZeroizeString` struct, with new-lines removed.
+pub fn read_password_string<P: AsRef<Path>>(path: P) -> Result<ZeroizeString, String> {
+    fs::read(path)
+        .map_err(|e| format!("Error opening file: {:?}", e))
+        .map(strip_off_newlines)
+        .and_then(|bytes| {
+            String::from_utf8(bytes)
+                .map_err(|e| format!("Error decoding utf8: {:?}", e))
+                .map(Into::into)
+        })
+}
+
 /// Write a file atomically by using a temporary file as an intermediate.
 ///
 /// Care is taken to preserve the permissions of the file at `file_path` being written.
@@ -220,6 +237,46 @@ impl AsRef<[u8]> for ZeroizeString {
     }
 }
 
+pub fn read_mnemonic_from_cli(
+    mnemonic_path: Option<PathBuf>,
+    stdin_inputs: bool,
+) -> Result<Mnemonic, String> {
+    let mnemonic = match mnemonic_path {
+        Some(path) => fs::read(&path)
+            .map_err(|e| format!("Unable to read {:?}: {:?}", path, e))
+            .and_then(|bytes| {
+                let bytes_no_newlines: PlainText = strip_off_newlines(bytes).into();
+                let phrase = from_utf8(bytes_no_newlines.as_ref())
+                    .map_err(|e| format!("Unable to derive mnemonic: {:?}", e))?;
+                Mnemonic::from_phrase(phrase, Language::English).map_err(|e| {
+                    format!(
+                        "Unable to derive mnemonic from string {:?}: {:?}",
+                        phrase, e
+                    )
+                })
+            })?,
+        None => loop {
+            eprintln!();
+            eprintln!("{}", MNEMONIC_PROMPT);
+
+            let mnemonic = read_input_from_user(stdin_inputs)?;
+
+            match Mnemonic::from_phrase(mnemonic.as_str(), Language::English) {
+                Ok(mnemonic_m) => {
+                    eprintln!("Valid mnemonic provided.");
+                    eprintln!();
+                    sleep(Duration::from_secs(1));
+                    break mnemonic_m;
+                }
+                Err(_) => {
+                    eprintln!("Invalid mnemonic");
+                }
+            }
+        },
+    };
+    Ok(mnemonic)
+}
+
 #[cfg(test)]
 mod test {
     use super::*;
diff --git a/common/account_utils/src/validator_definitions.rs b/common/account_utils/src/validator_definitions.rs
index 6ce2517fb2..c91e717d11 100644
--- a/common/account_utils/src/validator_definitions.rs
+++ b/common/account_utils/src/validator_definitions.rs
@@ -3,7 +3,9 @@
 //! Serves as the source-of-truth of which validators this validator client should attempt (or not
 //! attempt) to load into the `crate::intialized_validators::InitializedValidators` struct.
 
-use crate::{default_keystore_password_path, write_file_via_temporary, ZeroizeString};
+use crate::{
+    default_keystore_password_path, read_password_string, write_file_via_temporary, ZeroizeString,
+};
 use directory::ensure_dir_exists;
 use eth2_keystore::Keystore;
 use regex::Regex;
@@ -43,6 +45,18 @@ pub enum Error {
     UnableToOpenKeystore(eth2_keystore::Error),
     /// The validator directory could not be created.
     UnableToCreateValidatorDir(PathBuf),
+    UnableToReadKeystorePassword(String),
+    KeystoreWithoutPassword,
+}
+
+/// Defines how a password for a validator keystore will be persisted.
+pub enum PasswordStorage {
+    /// Store the password in the `validator_definitions.yml` file.
+    ValidatorDefinitions(ZeroizeString),
+    /// Store the password in a separate, dedicated file (likely in the "secrets" directory).
+    File(PathBuf),
+    /// Don't store the password at all.
+    None,
 }
 
 #[derive(Clone, PartialEq, Serialize, Deserialize, Hash, Eq)]
@@ -92,6 +106,34 @@ impl SigningDefinition {
     pub fn is_local_keystore(&self) -> bool {
         matches!(self, SigningDefinition::LocalKeystore { .. })
     }
+
+    pub fn voting_keystore_password(&self) -> Result<Option<ZeroizeString>, Error> {
+        match self {
+            SigningDefinition::LocalKeystore {
+                voting_keystore_password: Some(password),
+                ..
+            } => Ok(Some(password.clone())),
+            SigningDefinition::LocalKeystore {
+                voting_keystore_password_path: Some(path),
+                ..
+            } => read_password_string(path)
+                .map(Into::into)
+                .map(Option::Some)
+                .map_err(Error::UnableToReadKeystorePassword),
+            SigningDefinition::LocalKeystore { .. } => Err(Error::KeystoreWithoutPassword),
+            SigningDefinition::Web3Signer(_) => Ok(None),
+        }
+    }
+
+    pub fn voting_keystore_password_path(&self) -> Option<&PathBuf> {
+        match self {
+            SigningDefinition::LocalKeystore {
+                voting_keystore_password_path: Some(path),
+                ..
+            } => Some(path),
+            _ => None,
+        }
+    }
 }
 
 /// A validator that may be initialized by this validator client.
@@ -129,7 +171,7 @@ impl ValidatorDefinition {
     /// This function does not check the password against the keystore.
     pub fn new_keystore_with_password<P: AsRef<Path>>(
         voting_keystore_path: P,
-        voting_keystore_password: Option<ZeroizeString>,
+        voting_keystore_password_storage: PasswordStorage,
         graffiti: Option<GraffitiString>,
         suggested_fee_recipient: Option<Address>,
         gas_limit: Option<u64>,
@@ -139,6 +181,12 @@ impl ValidatorDefinition {
         let keystore =
             Keystore::from_json_file(&voting_keystore_path).map_err(Error::UnableToOpenKeystore)?;
         let voting_public_key = keystore.public_key().ok_or(Error::InvalidKeystorePubkey)?;
+        let (voting_keystore_password_path, voting_keystore_password) =
+            match voting_keystore_password_storage {
+                PasswordStorage::ValidatorDefinitions(password) => (None, Some(password)),
+                PasswordStorage::File(path) => (Some(path), None),
+                PasswordStorage::None => (None, None),
+            };
 
         Ok(ValidatorDefinition {
             enabled: true,
@@ -150,7 +198,7 @@ impl ValidatorDefinition {
             builder_proposals,
             signing_definition: SigningDefinition::LocalKeystore {
                 voting_keystore_path,
-                voting_keystore_password_path: None,
+                voting_keystore_password_path,
                 voting_keystore_password,
             },
         })
@@ -346,6 +394,13 @@ impl ValidatorDefinitions {
     pub fn as_mut_slice(&mut self) -> &mut [ValidatorDefinition] {
         self.0.as_mut_slice()
     }
+
+    // Returns an iterator over all the `voting_keystore_password_paths` in self.
+    pub fn iter_voting_keystore_password_paths(&self) -> impl Iterator<Item = &PathBuf> {
+        self.0
+            .iter()
+            .filter_map(|def| def.signing_definition.voting_keystore_password_path())
+    }
 }
 
 /// Perform an exhaustive tree search of `dir`, adding any discovered voting keystore paths to
diff --git a/common/eth2/Cargo.toml b/common/eth2/Cargo.toml
index d8e1a375fd..8cb3de3a00 100644
--- a/common/eth2/Cargo.toml
+++ b/common/eth2/Cargo.toml
@@ -35,14 +35,8 @@ tokio = { version = "1.14.0", features = ["full"] }
 
 [target.'cfg(target_os = "linux")'.dependencies]
 psutil = { version = "3.2.2", optional = true }
-procinfo = { version = "0.4.2", optional = true }
+procfs = { version = "0.15.1", optional = true }
 
 [features]
 default = ["lighthouse"]
-lighthouse = [
-    "proto_array",
-    "psutil",
-    "procinfo",
-    "store",
-    "slashing_protection",
-]
+lighthouse = ["proto_array", "psutil", "procfs", "store", "slashing_protection"]
diff --git a/common/eth2/src/lib.rs b/common/eth2/src/lib.rs
index e34916beba..74c2f3802f 100644
--- a/common/eth2/src/lib.rs
+++ b/common/eth2/src/lib.rs
@@ -21,10 +21,14 @@ use futures_util::StreamExt;
 use lighthouse_network::PeerId;
 use pretty_reqwest_error::PrettyReqwestError;
 pub use reqwest;
-use reqwest::{IntoUrl, RequestBuilder, Response};
+use reqwest::{
+    header::{HeaderMap, HeaderValue},
+    Body, IntoUrl, RequestBuilder, Response,
+};
 pub use reqwest::{StatusCode, Url};
 pub use sensitive_url::{SensitiveError, SensitiveUrl};
 use serde::{de::DeserializeOwned, Serialize};
+use ssz::Encode;
 use std::convert::TryFrom;
 use std::fmt;
 use std::iter::Iterator;
@@ -322,6 +326,25 @@ impl BeaconNodeHttpClient {
         ok_or_error(response).await
     }
 
+    /// Generic POST function supporting arbitrary responses and timeouts.
+    async fn post_generic_with_ssz_body<T: Into<Body>, U: IntoUrl>(
+        &self,
+        url: U,
+        body: T,
+        timeout: Option<Duration>,
+    ) -> Result<Response, Error> {
+        let mut builder = self.client.post(url);
+        if let Some(timeout) = timeout {
+            builder = builder.timeout(timeout);
+        }
+        let response = builder
+            .header("Content-Type", "application/octet-stream")
+            .body(body)
+            .send()
+            .await?;
+        ok_or_error(response).await
+    }
+
     /// Generic POST function supporting arbitrary responses and timeouts.
     async fn post_generic_with_consensus_version<T: Serialize, U: IntoUrl>(
         &self,
@@ -342,6 +365,31 @@ impl BeaconNodeHttpClient {
         ok_or_error(response).await
     }
 
+    /// Generic POST function supporting arbitrary responses and timeouts.
+    async fn post_generic_with_consensus_version_and_ssz_body<T: Into<Body>, U: IntoUrl>(
+        &self,
+        url: U,
+        body: T,
+        timeout: Option<Duration>,
+        fork: ForkName,
+    ) -> Result<Response, Error> {
+        let mut builder = self.client.post(url);
+        if let Some(timeout) = timeout {
+            builder = builder.timeout(timeout);
+        }
+        let mut headers = HeaderMap::new();
+        headers.insert(
+            CONSENSUS_VERSION_HEADER,
+            HeaderValue::from_str(&fork.to_string()).expect("Failed to create header value"),
+        );
+        headers.insert(
+            "Content-Type",
+            HeaderValue::from_static("application/octet-stream"),
+        );
+        let response = builder.headers(headers).body(body).send().await?;
+        ok_or_error(response).await
+    }
+
     /// `GET beacon/genesis`
     ///
     /// ## Errors
@@ -654,6 +702,26 @@ impl BeaconNodeHttpClient {
         Ok(())
     }
 
+    /// `POST beacon/blocks`
+    ///
+    /// Returns `Ok(None)` on a 404 error.
+    pub async fn post_beacon_blocks_ssz<T: EthSpec, Payload: AbstractExecPayload<T>>(
+        &self,
+        block: &SignedBeaconBlock<T, Payload>,
+    ) -> Result<(), Error> {
+        let mut path = self.eth_path(V1)?;
+
+        path.path_segments_mut()
+            .map_err(|()| Error::InvalidUrl(self.server.clone()))?
+            .push("beacon")
+            .push("blocks");
+
+        self.post_generic_with_ssz_body(path, block.as_ssz_bytes(), Some(self.timeouts.proposal))
+            .await?;
+
+        Ok(())
+    }
+
     /// `POST beacon/blinded_blocks`
     ///
     /// Returns `Ok(None)` on a 404 error.
@@ -674,6 +742,26 @@ impl BeaconNodeHttpClient {
         Ok(())
     }
 
+    /// `POST beacon/blinded_blocks`
+    ///
+    /// Returns `Ok(None)` on a 404 error.
+    pub async fn post_beacon_blinded_blocks_ssz<T: EthSpec, Payload: AbstractExecPayload<T>>(
+        &self,
+        block: &SignedBeaconBlock<T, Payload>,
+    ) -> Result<(), Error> {
+        let mut path = self.eth_path(V1)?;
+
+        path.path_segments_mut()
+            .map_err(|()| Error::InvalidUrl(self.server.clone()))?
+            .push("beacon")
+            .push("blinded_blocks");
+
+        self.post_generic_with_ssz_body(path, block.as_ssz_bytes(), Some(self.timeouts.proposal))
+            .await?;
+
+        Ok(())
+    }
+
     pub fn post_beacon_blocks_v2_path(
         &self,
         validation_level: Option<BroadcastValidation>,
@@ -727,6 +815,23 @@ impl BeaconNodeHttpClient {
         Ok(())
     }
 
+    /// `POST v2/beacon/blocks`
+    pub async fn post_beacon_blocks_v2_ssz<T: EthSpec, Payload: AbstractExecPayload<T>>(
+        &self,
+        block: &SignedBeaconBlock<T, Payload>,
+        validation_level: Option<BroadcastValidation>,
+    ) -> Result<(), Error> {
+        self.post_generic_with_consensus_version_and_ssz_body(
+            self.post_beacon_blocks_v2_path(validation_level)?,
+            block.as_ssz_bytes(),
+            Some(self.timeouts.proposal),
+            block.message().body().fork_name(),
+        )
+        .await?;
+
+        Ok(())
+    }
+
     /// `POST v2/beacon/blinded_blocks`
     pub async fn post_beacon_blinded_blocks_v2<T: EthSpec>(
         &self,
@@ -744,6 +849,23 @@ impl BeaconNodeHttpClient {
         Ok(())
     }
 
+    /// `POST v2/beacon/blinded_blocks`
+    pub async fn post_beacon_blinded_blocks_v2_ssz<T: EthSpec>(
+        &self,
+        block: &SignedBlindedBeaconBlock<T>,
+        validation_level: Option<BroadcastValidation>,
+    ) -> Result<(), Error> {
+        self.post_generic_with_consensus_version_and_ssz_body(
+            self.post_beacon_blinded_blocks_v2_path(validation_level)?,
+            block.as_ssz_bytes(),
+            Some(self.timeouts.proposal),
+            block.message().body().fork_name(),
+        )
+        .await?;
+
+        Ok(())
+    }
+
     /// Path for `v2/beacon/blocks`
     pub fn get_beacon_blocks_path(&self, block_id: BlockId) -> Result<Url, Error> {
         let mut path = self.eth_path(V2)?;
@@ -1139,6 +1261,23 @@ impl BeaconNodeHttpClient {
         Ok(())
     }
 
+    // GET builder/states/{state_id}/expected_withdrawals
+    pub async fn get_expected_withdrawals(
+        &self,
+        state_id: &StateId,
+    ) -> Result<ExecutionOptimisticFinalizedResponse<Vec<Withdrawal>>, Error> {
+        let mut path = self.eth_path(V1)?;
+
+        path.path_segments_mut()
+            .map_err(|()| Error::InvalidUrl(self.server.clone()))?
+            .push("builder")
+            .push("states")
+            .push(&state_id.to_string())
+            .push("expected_withdrawals");
+
+        self.get(path).await
+    }
+
     /// `POST validator/contribution_and_proofs`
     pub async fn post_validator_contribution_and_proofs<T: EthSpec>(
         &self,
@@ -1636,6 +1775,24 @@ impl BeaconNodeHttpClient {
         .await
     }
 
+    /// `POST validator/liveness/{epoch}`
+    pub async fn post_validator_liveness_epoch(
+        &self,
+        epoch: Epoch,
+        indices: Vec<u64>,
+    ) -> Result<GenericResponse<Vec<StandardLivenessResponseData>>, Error> {
+        let mut path = self.eth_path(V1)?;
+
+        path.path_segments_mut()
+            .map_err(|()| Error::InvalidUrl(self.server.clone()))?
+            .push("validator")
+            .push("liveness")
+            .push(&epoch.to_string());
+
+        self.post_with_timeout_and_response(path, &indices, self.timeouts.liveness)
+            .await
+    }
+
     /// `POST validator/duties/attester/{epoch}`
     pub async fn post_validator_duties_attester(
         &self,
diff --git a/common/eth2/src/lighthouse.rs b/common/eth2/src/lighthouse.rs
index 1b4bcc0e39..dfc19db492 100644
--- a/common/eth2/src/lighthouse.rs
+++ b/common/eth2/src/lighthouse.rs
@@ -95,8 +95,8 @@ pub struct ValidatorInclusionData {
 
 #[cfg(target_os = "linux")]
 use {
-    procinfo::pid, psutil::cpu::os::linux::CpuTimesExt,
-    psutil::memory::os::linux::VirtualMemoryExt, psutil::process::Process,
+    psutil::cpu::os::linux::CpuTimesExt, psutil::memory::os::linux::VirtualMemoryExt,
+    psutil::process::Process,
 };
 
 /// Reports on the health of the Lighthouse instance.
@@ -238,7 +238,7 @@ pub struct ProcessHealth {
     /// The pid of this process.
     pub pid: u32,
     /// The number of threads used by this pid.
-    pub pid_num_threads: i32,
+    pub pid_num_threads: i64,
     /// The total resident memory used by this pid.
     pub pid_mem_resident_set_size: u64,
     /// The total virtual memory used by this pid.
@@ -262,7 +262,12 @@ impl ProcessHealth {
             .memory_info()
             .map_err(|e| format!("Unable to get process memory info: {:?}", e))?;
 
-        let stat = pid::stat_self().map_err(|e| format!("Unable to get stat: {:?}", e))?;
+        let me = procfs::process::Process::myself()
+            .map_err(|e| format!("Unable to get process: {:?}", e))?;
+        let stat = me
+            .stat()
+            .map_err(|e| format!("Unable to get stat: {:?}", e))?;
+
         let process_times = process
             .cpu_times()
             .map_err(|e| format!("Unable to get process cpu times : {:?}", e))?;
diff --git a/common/eth2/src/lighthouse/attestation_rewards.rs b/common/eth2/src/lighthouse/attestation_rewards.rs
index bebd1c661b..fa3f93d06f 100644
--- a/common/eth2/src/lighthouse/attestation_rewards.rs
+++ b/common/eth2/src/lighthouse/attestation_rewards.rs
@@ -1,4 +1,5 @@
 use serde::{Deserialize, Serialize};
+use serde_utils::quoted_u64::Quoted;
 
 // Details about the rewards paid for attestations
 // All rewards in GWei
@@ -17,6 +18,12 @@ pub struct IdealAttestationRewards {
     // Ideal attester's reward for source vote in gwei
     #[serde(with = "serde_utils::quoted_u64")]
     pub source: u64,
+    // Ideal attester's inclusion_delay reward in gwei (phase0 only)
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub inclusion_delay: Option<Quoted<u64>>,
+    // Ideal attester's inactivity penalty in gwei
+    #[serde(with = "serde_utils::quoted_i64")]
+    pub inactivity: i64,
 }
 
 #[derive(Debug, PartialEq, Eq, Clone, Serialize, Deserialize)]
@@ -25,16 +32,20 @@ pub struct TotalAttestationRewards {
     #[serde(with = "serde_utils::quoted_u64")]
     pub validator_index: u64,
     // attester's reward for head vote in gwei
-    #[serde(with = "serde_utils::quoted_u64")]
-    pub head: u64,
+    #[serde(with = "serde_utils::quoted_i64")]
+    pub head: i64,
     // attester's reward for target vote in gwei
     #[serde(with = "serde_utils::quoted_i64")]
     pub target: i64,
     // attester's reward for source vote in gwei
     #[serde(with = "serde_utils::quoted_i64")]
     pub source: i64,
-    // TBD attester's inclusion_delay reward in gwei (phase0 only)
-    // pub inclusion_delay: u64,
+    // attester's inclusion_delay reward in gwei (phase0 only)
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub inclusion_delay: Option<Quoted<u64>>,
+    // attester's inactivity penalty in gwei
+    #[serde(with = "serde_utils::quoted_i64")]
+    pub inactivity: i64,
 }
 
 #[derive(Debug, PartialEq, Eq, Clone, Serialize, Deserialize)]
diff --git a/common/eth2/src/lighthouse_vc/http_client.rs b/common/eth2/src/lighthouse_vc/http_client.rs
index cd7873c9b6..7bf4cf5b19 100644
--- a/common/eth2/src/lighthouse_vc/http_client.rs
+++ b/common/eth2/src/lighthouse_vc/http_client.rs
@@ -490,6 +490,21 @@ impl ValidatorClientHttpClient {
         .await
     }
 
+    /// `DELETE eth/v1/keystores`
+    pub async fn delete_lighthouse_keystores(
+        &self,
+        req: &DeleteKeystoresRequest,
+    ) -> Result<ExportKeystoresResponse, Error> {
+        let mut path = self.server.full.clone();
+
+        path.path_segments_mut()
+            .map_err(|()| Error::InvalidUrl(self.server.clone()))?
+            .push("lighthouse")
+            .push("keystores");
+
+        self.delete_with_unsigned_response(path, req).await
+    }
+
     fn make_keystores_url(&self) -> Result<Url, Error> {
         let mut url = self.server.full.clone();
         url.path_segments_mut()
diff --git a/common/eth2/src/lighthouse_vc/std_types.rs b/common/eth2/src/lighthouse_vc/std_types.rs
index 0d67df47a9..33e2f764ef 100644
--- a/common/eth2/src/lighthouse_vc/std_types.rs
+++ b/common/eth2/src/lighthouse_vc/std_types.rs
@@ -1,9 +1,10 @@
 use account_utils::ZeroizeString;
 use eth2_keystore::Keystore;
 use serde::{Deserialize, Serialize};
-use slashing_protection::interchange::Interchange;
 use types::{Address, PublicKeyBytes};
 
+pub use slashing_protection::interchange::Interchange;
+
 #[derive(Debug, Deserialize, Serialize, PartialEq)]
 pub struct GetFeeRecipientResponse {
     pub pubkey: PublicKeyBytes,
@@ -27,7 +28,7 @@ pub struct ListKeystoresResponse {
     pub data: Vec<SingleKeystoreResponse>,
 }
 
-#[derive(Debug, Deserialize, Serialize, PartialEq)]
+#[derive(Debug, Deserialize, Serialize, PartialEq, Eq, Hash)]
 pub struct SingleKeystoreResponse {
     pub validating_pubkey: PublicKeyBytes,
     pub derivation_path: Option<String>,
diff --git a/common/eth2/src/lighthouse_vc/types.rs b/common/eth2/src/lighthouse_vc/types.rs
index 7bbe041dbd..f1a91b4ef1 100644
--- a/common/eth2/src/lighthouse_vc/types.rs
+++ b/common/eth2/src/lighthouse_vc/types.rs
@@ -152,3 +152,19 @@ pub struct UpdateGasLimitRequest {
 pub struct VoluntaryExitQuery {
     pub epoch: Option<Epoch>,
 }
+
+#[derive(Deserialize, Serialize)]
+pub struct ExportKeystoresResponse {
+    pub data: Vec<SingleExportKeystoresResponse>,
+    #[serde(with = "serde_utils::json_str")]
+    pub slashing_protection: Interchange,
+}
+
+#[derive(Deserialize, Serialize)]
+pub struct SingleExportKeystoresResponse {
+    pub status: Status<DeleteKeystoreStatus>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub validating_keystore: Option<KeystoreJsonStr>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub validating_keystore_password: Option<ZeroizeString>,
+}
diff --git a/common/eth2/src/types.rs b/common/eth2/src/types.rs
index 5f2e1ada7b..822f881799 100644
--- a/common/eth2/src/types.rs
+++ b/common/eth2/src/types.rs
@@ -581,6 +581,11 @@ pub struct SyncingData {
     pub sync_distance: Slot,
 }
 
+#[derive(Serialize, Deserialize)]
+pub struct ExpectedWithdrawalsQuery {
+    pub proposal_slot: Option<Slot>,
+}
+
 #[derive(Clone, PartialEq, Debug, Deserialize)]
 #[serde(try_from = "String", bound = "T: FromStr")]
 pub struct QueryVec<T: FromStr> {
@@ -1225,6 +1230,13 @@ impl FromStr for Accept {
     }
 }
 
+#[derive(PartialEq, Debug, Serialize, Deserialize)]
+pub struct StandardLivenessResponseData {
+    #[serde(with = "serde_utils::quoted_u64")]
+    pub index: u64,
+    pub is_live: bool,
+}
+
 #[derive(Debug, Serialize, Deserialize)]
 pub struct LivenessRequestData {
     pub epoch: Epoch,
@@ -1304,6 +1316,26 @@ pub struct BroadcastValidationQuery {
     pub broadcast_validation: BroadcastValidation,
 }
 
+pub mod serde_status_code {
+    use crate::StatusCode;
+    use serde::{de::Error, Deserialize, Serialize};
+
+    pub fn serialize<S>(status_code: &StatusCode, ser: S) -> Result<S::Ok, S::Error>
+    where
+        S: serde::Serializer,
+    {
+        status_code.as_u16().serialize(ser)
+    }
+
+    pub fn deserialize<'de, D>(de: D) -> Result<StatusCode, D::Error>
+    where
+        D: serde::de::Deserializer<'de>,
+    {
+        let status_code = u16::deserialize(de)?;
+        StatusCode::try_from(status_code).map_err(D::Error::custom)
+    }
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;
diff --git a/common/eth2_config/src/lib.rs b/common/eth2_config/src/lib.rs
index 7e5506667f..6487151a92 100644
--- a/common/eth2_config/src/lib.rs
+++ b/common/eth2_config/src/lib.rs
@@ -23,6 +23,23 @@ pub const PREDEFINED_NETWORKS_DIR: &str = predefined_networks_dir!();
 pub const GENESIS_FILE_NAME: &str = "genesis.ssz";
 pub const GENESIS_ZIP_FILE_NAME: &str = "genesis.ssz.zip";
 
+const HOLESKY_GENESIS_STATE_SOURCE: GenesisStateSource = GenesisStateSource::Url {
+    urls: &[
+        // This is an AWS S3 bucket hosted by Sigma Prime. See Paul Hauner for
+        // more details.
+        "https://sigp-public-genesis-states.s3.ap-southeast-2.amazonaws.com/holesky/",
+    ],
+    checksum: "0x76631cd0b9ddc5b2c766b496e23f16759ce1181446a4efb40e5540cd15b78a07",
+    genesis_validators_root: "0x9143aa7c615a7f7115e2b6aac319c03529df8242ae705fba9df39b79c59fa8b1",
+};
+
+const CHIADO_GENESIS_STATE_SOURCE: GenesisStateSource = GenesisStateSource::Url {
+    // No default checkpoint sources are provided.
+    urls: &[],
+    checksum: "0xd4a039454c7429f1dfaa7e11e397ef3d0f50d2d5e4c0e4dc04919d153aa13af1",
+    genesis_validators_root: "0x9d642dac73058fbf39c0ae41ab1e34e4d889043cb199851ded7095bc99eb4c1e",
+};
+
 /// The core configuration of a Lighthouse beacon node.
 #[derive(Debug, Clone)]
 pub struct Eth2Config {
@@ -62,6 +79,32 @@ impl Eth2Config {
     }
 }
 
+/// Describes how a genesis state may be obtained.
+#[derive(Copy, Clone, Debug, PartialEq)]
+pub enum GenesisStateSource {
+    /// The genesis state for this network is not yet known.
+    Unknown,
+    /// The genesis state for this network is included in the binary via
+    /// `include_bytes!` or by loading from a testnet dir.
+    IncludedBytes,
+    /// The genesis state for this network should be downloaded from a URL.
+    Url {
+        /// URLs to try to download the file from, in order.
+        urls: &'static [&'static str],
+        /// The SHA256 of the genesis state bytes. This is *not* a hash tree
+        /// root to simplify the types (i.e., to avoid getting EthSpec
+        /// involved).
+        ///
+        /// The format should be 0x-prefixed ASCII bytes.
+        checksum: &'static str,
+        /// The `genesis_validators_root` of the genesis state. Used to avoid
+        /// downloading the state for simple signing operations.
+        ///
+        /// The format should be 0x-prefixed ASCII bytes.
+        genesis_validators_root: &'static str,
+    },
+}
+
 /// A directory that can be built by downloading files via HTTP.
 ///
 /// Used by the `eth2_network_config` crate to initialize the network directories during build and
@@ -70,7 +113,7 @@ impl Eth2Config {
 pub struct Eth2NetArchiveAndDirectory<'a> {
     pub name: &'a str,
     pub config_dir: &'a str,
-    pub genesis_is_known: bool,
+    pub genesis_state_source: GenesisStateSource,
 }
 
 impl<'a> Eth2NetArchiveAndDirectory<'a> {
@@ -89,15 +132,11 @@ impl<'a> Eth2NetArchiveAndDirectory<'a> {
     }
 }
 
-/// Indicates that the `genesis.ssz.zip` file is present on the filesystem. This means that the
-/// deposit ceremony has concluded and the final genesis `BeaconState` is known.
-const GENESIS_STATE_IS_KNOWN: bool = true;
-
-#[derive(Copy, Clone, Debug, PartialEq)]
+#[derive(Clone, Debug, PartialEq)]
 pub struct HardcodedNet {
     pub name: &'static str,
     pub config_dir: &'static str,
-    pub genesis_is_known: bool,
+    pub genesis_state_source: GenesisStateSource,
     pub config: &'static [u8],
     pub deploy_block: &'static [u8],
     pub boot_enr: &'static [u8],
@@ -109,7 +148,7 @@ pub struct HardcodedNet {
 /// It also defines a `include_<title>_file!` macro which provides a wrapper around
 /// `std::include_bytes`, allowing the inclusion of bytes from the specific testnet directory.
 macro_rules! define_archive {
-    ($name_ident: ident, $config_dir: tt, $genesis_is_known: ident) => {
+    ($name_ident: ident, $config_dir: tt, $genesis_state_source: path) => {
         paste! {
             #[macro_use]
             pub mod $name_ident {
@@ -118,7 +157,7 @@ macro_rules! define_archive {
                 pub const ETH2_NET_DIR: Eth2NetArchiveAndDirectory = Eth2NetArchiveAndDirectory {
                     name: stringify!($name_ident),
                     config_dir: $config_dir,
-                    genesis_is_known: $genesis_is_known,
+                    genesis_state_source: $genesis_state_source,
                 };
 
                 /// A wrapper around `std::include_bytes` which includes a file from a specific network
@@ -151,7 +190,7 @@ macro_rules! define_net {
         $this_crate::HardcodedNet {
             name: ETH2_NET_DIR.name,
             config_dir: ETH2_NET_DIR.config_dir,
-            genesis_is_known: ETH2_NET_DIR.genesis_is_known,
+            genesis_state_source: ETH2_NET_DIR.genesis_state_source,
             config: $this_crate::$include_file!($this_crate, "../", "config.yaml"),
             deploy_block: $this_crate::$include_file!($this_crate, "../", "deploy_block.txt"),
             boot_enr: $this_crate::$include_file!($this_crate, "../", "boot_enr.yaml"),
@@ -199,9 +238,9 @@ macro_rules! define_nets {
 /// `build.rs` which will unzip the genesis states. Then, that `eth2_network_configs` crate can
 /// perform the final step of using `std::include_bytes` to bake the files (bytes) into the binary.
 macro_rules! define_hardcoded_nets {
-    ($(($name_ident: ident, $config_dir: tt, $genesis_is_known: ident)),+) => {
+    ($(($name_ident: ident, $config_dir: tt, $genesis_state_source: path)),+) => {
         $(
-        define_archive!($name_ident, $config_dir, $genesis_is_known);
+        define_archive!($name_ident, $config_dir, $genesis_state_source);
         )+
 
         pub const ETH2_NET_DIRS: &[Eth2NetArchiveAndDirectory<'static>] = &[$($name_ident::ETH2_NET_DIR,)+];
@@ -242,9 +281,8 @@ define_hardcoded_nets!(
         // The name of the directory in the `eth2_network_config/built_in_network_configs`
         // directory where the configuration files are located for this network.
         "mainnet",
-        // Set to `true` if the genesis state can be found in the `built_in_network_configs`
-        // directory.
-        GENESIS_STATE_IS_KNOWN
+        // Describes how the genesis state can be obtained.
+        GenesisStateSource::IncludedBytes
     ),
     (
         // Network name (must be unique among all networks).
@@ -252,9 +290,8 @@ define_hardcoded_nets!(
         // The name of the directory in the `eth2_network_config/built_in_network_configs`
         // directory where the configuration files are located for this network.
         "prater",
-        // Set to `true` if the genesis state can be found in the `built_in_network_configs`
-        // directory.
-        GENESIS_STATE_IS_KNOWN
+        // Describes how the genesis state can be obtained.
+        GenesisStateSource::IncludedBytes
     ),
     (
         // Network name (must be unique among all networks).
@@ -264,9 +301,8 @@ define_hardcoded_nets!(
         //
         // The Goerli network is effectively an alias to Prater.
         "prater",
-        // Set to `true` if the genesis state can be found in the `built_in_network_configs`
-        // directory.
-        GENESIS_STATE_IS_KNOWN
+        // Describes how the genesis state can be obtained.
+        GenesisStateSource::IncludedBytes
     ),
     (
         // Network name (must be unique among all networks).
@@ -274,9 +310,18 @@ define_hardcoded_nets!(
         // The name of the directory in the `eth2_network_config/built_in_network_configs`
         // directory where the configuration files are located for this network.
         "gnosis",
+        // Describes how the genesis state can be obtained.
+        GenesisStateSource::IncludedBytes
+    ),
+    (
+        // Network name (must be unique among all networks).
+        chiado,
+        // The name of the directory in the `eth2_network_config/built_in_network_configs`
+        // directory where the configuration files are located for this network.
+        "chiado",
         // Set to `true` if the genesis state can be found in the `built_in_network_configs`
         // directory.
-        GENESIS_STATE_IS_KNOWN
+        CHIADO_GENESIS_STATE_SOURCE
     ),
     (
         // Network name (must be unique among all networks).
@@ -284,8 +329,16 @@ define_hardcoded_nets!(
         // The name of the directory in the `eth2_network_config/built_in_network_configs`
         // directory where the configuration files are located for this network.
         "sepolia",
-        // Set to `true` if the genesis state can be found in the `built_in_network_configs`
-        // directory.
-        GENESIS_STATE_IS_KNOWN
+        // Describes how the genesis state can be obtained.
+        GenesisStateSource::IncludedBytes
+    ),
+    (
+        // Network name (must be unique among all networks).
+        holesky,
+        // The name of the directory in the `eth2_network_config/built_in_network_configs`
+        // directory where the configuration files are located for this network.
+        "holesky",
+        // Describes how the genesis state can be obtained.
+        HOLESKY_GENESIS_STATE_SOURCE
     )
 );
diff --git a/common/eth2_network_config/Cargo.toml b/common/eth2_network_config/Cargo.toml
index 296d43b1a2..e73f64d5a8 100644
--- a/common/eth2_network_config/Cargo.toml
+++ b/common/eth2_network_config/Cargo.toml
@@ -7,15 +7,22 @@ edition = "2021"
 build = "build.rs"
 
 [build-dependencies]
-zip = "0.5.8"
-eth2_config = { path = "../eth2_config"}
+zip = "0.6"
+eth2_config = { path = "../eth2_config" }
 
 [dev-dependencies]
 tempfile = "3.1.0"
 
 [dependencies]
 serde_yaml = "0.8.13"
-types = { path = "../../consensus/types"}
+types = { path = "../../consensus/types" }
 ethereum_ssz = "0.5.0"
-eth2_config = { path = "../eth2_config"}
-discv5 = "0.3.0"
\ No newline at end of file
+eth2_config = { path = "../eth2_config" }
+discv5 = "0.3.1"
+reqwest = { version = "0.11.0", features = ["blocking"] }
+pretty_reqwest_error = { path = "../pretty_reqwest_error" }
+sha2 = "0.10"
+url = "2.2.2"
+sensitive_url = { path = "../sensitive_url" }
+slog = "2.5.2"
+logging = { path = "../logging" }
diff --git a/common/eth2_network_config/build.rs b/common/eth2_network_config/build.rs
index fa45fafa4e..3165930f4a 100644
--- a/common/eth2_network_config/build.rs
+++ b/common/eth2_network_config/build.rs
@@ -1,5 +1,7 @@
 //! Extracts zipped genesis states on first run.
-use eth2_config::{Eth2NetArchiveAndDirectory, ETH2_NET_DIRS, GENESIS_FILE_NAME};
+use eth2_config::{
+    Eth2NetArchiveAndDirectory, GenesisStateSource, ETH2_NET_DIRS, GENESIS_FILE_NAME,
+};
 use std::fs::File;
 use std::io;
 use zip::ZipArchive;
@@ -26,7 +28,7 @@ fn uncompress_state(network: &Eth2NetArchiveAndDirectory<'static>) -> Result<(),
         return Ok(());
     }
 
-    if network.genesis_is_known {
+    if network.genesis_state_source == GenesisStateSource::IncludedBytes {
         // Extract genesis state from genesis.ssz.zip
         let archive_path = network.genesis_state_archive();
         let archive_file = File::open(&archive_path)
@@ -46,7 +48,8 @@ fn uncompress_state(network: &Eth2NetArchiveAndDirectory<'static>) -> Result<(),
         io::copy(&mut file, &mut outfile)
             .map_err(|e| format!("Error writing file {:?}: {}", genesis_ssz_path, e))?;
     } else {
-        // Create empty genesis.ssz if genesis is unknown
+        // Create empty genesis.ssz if genesis is unknown or to be downloaded via URL.
+        // This is a bit of a hack to make `include_bytes!` easier to deal with.
         File::create(genesis_ssz_path)
             .map_err(|e| format!("Failed to create {}: {}", GENESIS_FILE_NAME, e))?;
     }
diff --git a/common/eth2_network_config/built_in_network_configs/chiado/boot_enr.yaml b/common/eth2_network_config/built_in_network_configs/chiado/boot_enr.yaml
new file mode 100644
index 0000000000..96baffde6f
--- /dev/null
+++ b/common/eth2_network_config/built_in_network_configs/chiado/boot_enr.yaml
@@ -0,0 +1,8 @@
+# chiado-teku-0
+- "enr:-Ly4QLYLNqrjvSxD3lpAPBUNlxa6cIbe79JqLZLFcZZjWoCjZcw-85agLUErHiygG2weRSCLnd5V460qTbLbwJQsfZkoh2F0dG5ldHOI__________-EZXRoMpAxNnBDAgAAb___________gmlkgnY0gmlwhKq7mu-Jc2VjcDI1NmsxoQP900YAYa9kdvzlSKGjVo-F3XVzATjOYp3BsjLjSophO4hzeW5jbmV0cw-DdGNwgiMog3VkcIIjKA"
+# chiado-teku-1
+- "enr:-Ly4QCGeYvTCNOGKi0mKRUd45rLj96b4pH98qG7B9TCUGXGpHZALtaL2-XfjASQyhbCqENccI4PGXVqYTIehNT9KJMQgh2F0dG5ldHOI__________-EZXRoMpAxNnBDAgAAb___________gmlkgnY0gmlwhIuQrVSJc2VjcDI1NmsxoQP9iDchx2PGl3JyJ29B9fhLCvVMN6n23pPAIIeFV-sHOIhzeW5jbmV0cw-DdGNwgiMog3VkcIIjKA"
+#GnosisDAO Bootnode: 3.71.132.231
+- "enr:-Ly4QAtr21x5Ps7HYhdZkIBRBgcBkvlIfEel1YNjtFWf4cV3au2LgBGICz9PtEs9-p2HUl_eME8m1WImxTxSB3AkCMwBh2F0dG5ldHOIAAAAAAAAAACEZXRoMpAxNnBDAgAAb___________gmlkgnY0gmlwhANHhOeJc2VjcDI1NmsxoQNLp1QPV8-pyMCohOtj6xGtSBM_GtVTqzlbvNsCF4ezkYhzeW5jbmV0cwCDdGNwgiMog3VkcIIjKA"
+#GnosisDAO Bootnode: 3.69.35.13
+- "enr:-Ly4QLgn8Bx6faigkKUGZQvd1HDToV2FAxZIiENK-lczruzQb90qJK-4E65ADly0s4__dQOW7IkLMW7ZAyJy2vtiLy8Bh2F0dG5ldHOIAAAAAAAAAACEZXRoMpAxNnBDAgAAb___________gmlkgnY0gmlwhANFIw2Jc2VjcDI1NmsxoQMa-fWEy9UJHfOl_lix3wdY5qust78sHAqZnWwEiyqKgYhzeW5jbmV0cwCDdGNwgiMog3VkcIIjKA"
diff --git a/common/eth2_network_config/built_in_network_configs/chiado/config.yaml b/common/eth2_network_config/built_in_network_configs/chiado/config.yaml
new file mode 100644
index 0000000000..47b285a654
--- /dev/null
+++ b/common/eth2_network_config/built_in_network_configs/chiado/config.yaml
@@ -0,0 +1,154 @@
+# Extends the mainnet preset
+PRESET_BASE: gnosis
+# needs to exist because of Prysm. Otherwise it conflicts with mainnet genesis
+CONFIG_NAME: chiado
+
+# Genesis
+MIN_GENESIS_ACTIVE_VALIDATOR_COUNT: 6000
+# 10 October 2022 10:00:00 GMT+0000
+MIN_GENESIS_TIME: 1665396000
+GENESIS_DELAY: 300
+
+# Projected time: 2022-11-04T15:00:00.000Z, block: 680928
+TERMINAL_TOTAL_DIFFICULTY: 231707791542740786049188744689299064356246512
+
+# Deposit contract
+# ---------------------------------------------------------------
+# NOTE: Don't use a value too high, or Teku rejects it (4294906129 NOK)
+DEPOSIT_CHAIN_ID: 10200
+DEPOSIT_NETWORK_ID: 10200
+DEPOSIT_CONTRACT_ADDRESS: 0xb97036A26259B7147018913bD58a774cf91acf25
+
+# Misc
+# ---------------------------------------------------------------
+# 2**6 (= 64)
+MAX_COMMITTEES_PER_SLOT: 64
+# 2**7 (= 128)
+TARGET_COMMITTEE_SIZE: 128
+# 2**11 (= 2,048)
+MAX_VALIDATORS_PER_COMMITTEE: 2048
+# 2**2 (= 4)
+MIN_PER_EPOCH_CHURN_LIMIT: 4
+# 2**12 (= 4096)
+CHURN_LIMIT_QUOTIENT: 4096
+# See issue 563
+SHUFFLE_ROUND_COUNT: 90
+# 4
+HYSTERESIS_QUOTIENT: 4
+# 1 (minus 0.25)
+HYSTERESIS_DOWNWARD_MULTIPLIER: 1
+# 5 (plus 1.25)
+HYSTERESIS_UPWARD_MULTIPLIER: 5
+# Validator
+# ---------------------------------------------------------------
+# 2**10 (= 1024) ~1.4 hour
+ETH1_FOLLOW_DISTANCE: 1024
+# 2**4 (= 16)
+TARGET_AGGREGATORS_PER_COMMITTEE: 16
+# 2**0 (= 1)
+RANDOM_SUBNETS_PER_VALIDATOR: 1
+# 2**8 (= 256)
+EPOCHS_PER_RANDOM_SUBNET_SUBSCRIPTION: 256
+# 6 (estimate from xDai mainnet)
+SECONDS_PER_ETH1_BLOCK: 6
+
+# Gwei values
+# ---------------------------------------------------------------
+# 2**0 * 10**9 (= 1,000,000,000) Gwei
+MIN_DEPOSIT_AMOUNT: 1000000000
+# 2**5 * 10**9 (= 32,000,000,000) Gwei
+MAX_EFFECTIVE_BALANCE: 32000000000
+# 2**4 * 10**9 (= 16,000,000,000) Gwei
+EJECTION_BALANCE: 16000000000
+# 2**0 * 10**9 (= 1,000,000,000) Gwei
+EFFECTIVE_BALANCE_INCREMENT: 1000000000
+# Initial values
+# ---------------------------------------------------------------
+# GBC area code
+GENESIS_FORK_VERSION: 0x0000006f
+BLS_WITHDRAWAL_PREFIX: 0x00
+# Time parameters
+# ---------------------------------------------------------------
+# 5 seconds
+SECONDS_PER_SLOT: 5
+# 2**0 (= 1) slots 12 seconds
+MIN_ATTESTATION_INCLUSION_DELAY: 1
+# 2**4 (= 16) slots 1.87 minutes
+SLOTS_PER_EPOCH: 16
+# 2**0 (= 1) epochs 1.87 minutes
+MIN_SEED_LOOKAHEAD: 1
+# 2**2 (= 4) epochs 7.47 minutes
+MAX_SEED_LOOKAHEAD: 4
+# 2**6 (= 64) epochs ~2 hours
+EPOCHS_PER_ETH1_VOTING_PERIOD: 64
+# 2**13 (= 8,192) slots ~15.9 hours
+SLOTS_PER_HISTORICAL_ROOT: 8192
+# 2**8 (= 256) epochs ~8 hours
+MIN_VALIDATOR_WITHDRAWABILITY_DELAY: 256
+# 2**8 (= 256) epochs ~8 hours
+SHARD_COMMITTEE_PERIOD: 256
+# 2**2 (= 4) epochs 7.47 minutes
+MIN_EPOCHS_TO_INACTIVITY_PENALTY: 4
+
+# State vector lengths
+# ---------------------------------------------------------------
+# 2**16 (= 65,536) epochs ~85 days
+EPOCHS_PER_HISTORICAL_VECTOR: 65536
+# 2**13 (= 8,192) epochs ~10.6 days
+EPOCHS_PER_SLASHINGS_VECTOR: 8192
+# 2**24 (= 16,777,216) historical roots, ~15,243 years
+HISTORICAL_ROOTS_LIMIT: 16777216
+# 2**40 (= 1,099,511,627,776) validator spots
+VALIDATOR_REGISTRY_LIMIT: 1099511627776
+# Reward and penalty quotients
+# ---------------------------------------------------------------
+# 25
+BASE_REWARD_FACTOR: 25
+# 2**9 (= 512)
+WHISTLEBLOWER_REWARD_QUOTIENT: 512
+# 2**3 (= 8)
+PROPOSER_REWARD_QUOTIENT: 8
+# 2**26 (= 67,108,864)
+INACTIVITY_PENALTY_QUOTIENT: 67108864
+# 2**7 (= 128) (lower safety margin at Phase 0 genesis)
+MIN_SLASHING_PENALTY_QUOTIENT: 128
+# 1 (lower safety margin at Phase 0 genesis)
+PROPORTIONAL_SLASHING_MULTIPLIER: 1
+# Max operations per block
+# ---------------------------------------------------------------
+# 2**4 (= 16)
+MAX_PROPOSER_SLASHINGS: 16
+# 2**1 (= 2)
+MAX_ATTESTER_SLASHINGS: 2
+# 2**7 (= 128)
+MAX_ATTESTATIONS: 128
+# 2**4 (= 16)
+MAX_DEPOSITS: 16
+# 2**4 (= 16)
+MAX_VOLUNTARY_EXITS: 16
+# Signature domains
+# ---------------------------------------------------------------
+DOMAIN_BEACON_PROPOSER: 0x00000000
+DOMAIN_BEACON_ATTESTER: 0x01000000
+DOMAIN_RANDAO: 0x02000000
+DOMAIN_DEPOSIT: 0x03000000
+DOMAIN_VOLUNTARY_EXIT: 0x04000000
+DOMAIN_SELECTION_PROOF: 0x05000000
+DOMAIN_AGGREGATE_AND_PROOF: 0x06000000
+DOMAIN_SYNC_COMMITTEE: 0x07000000
+DOMAIN_SYNC_COMMITTEE_SELECTION_PROOF: 0x08000000
+DOMAIN_CONTRIBUTION_AND_PROOF: 0x09000000
+
+# Altair
+ALTAIR_FORK_VERSION: 0x0100006f
+ALTAIR_FORK_EPOCH: 90 # Mon Oct 10 2022 12:00:00 GMT+0000
+# Bellatrix
+BELLATRIX_FORK_VERSION: 0x0200006f
+BELLATRIX_FORK_EPOCH: 180 # Mon Oct 10 2022 14:00:00 GMT+0000
+# Capella
+CAPELLA_FORK_VERSION: 0x0300006f
+CAPELLA_FORK_EPOCH: 244224 # Wed May 24 2023 13:12:00 GMT+0000
+
+INACTIVITY_SCORE_BIAS: 4
+# 2**4 (= 16)
+INACTIVITY_SCORE_RECOVERY_RATE: 16
diff --git a/common/eth2_network_config/built_in_network_configs/chiado/deploy_block.txt b/common/eth2_network_config/built_in_network_configs/chiado/deploy_block.txt
new file mode 100644
index 0000000000..573541ac97
--- /dev/null
+++ b/common/eth2_network_config/built_in_network_configs/chiado/deploy_block.txt
@@ -0,0 +1 @@
+0
diff --git a/common/eth2_network_config/built_in_network_configs/gnosis/config.yaml b/common/eth2_network_config/built_in_network_configs/gnosis/config.yaml
index 0fdc159ec2..8e7a9dd07a 100644
--- a/common/eth2_network_config/built_in_network_configs/gnosis/config.yaml
+++ b/common/eth2_network_config/built_in_network_configs/gnosis/config.yaml
@@ -89,4 +89,14 @@ DEPOSIT_CONTRACT_ADDRESS: 0x0B98057eA310F4d31F2a452B414647007d1645d9
 
 # Network
 # ---------------------------------------------------------------
-SUBNETS_PER_NODE: 4
\ No newline at end of file
+SUBNETS_PER_NODE: 4
+GOSSIP_MAX_SIZE: 10485760
+MIN_EPOCHS_FOR_BLOCK_REQUESTS: 33024
+MAX_CHUNK_SIZE: 10485760
+TTFB_TIMEOUT: 5
+RESP_TIMEOUT: 10
+MESSAGE_DOMAIN_INVALID_SNAPPY: 0x00000000
+MESSAGE_DOMAIN_VALID_SNAPPY: 0x01000000
+ATTESTATION_SUBNET_COUNT: 64
+ATTESTATION_SUBNET_EXTRA_BITS: 0
+ATTESTATION_SUBNET_PREFIX_BITS: 6
diff --git a/common/eth2_network_config/built_in_network_configs/holesky/boot_enr.yaml b/common/eth2_network_config/built_in_network_configs/holesky/boot_enr.yaml
new file mode 100644
index 0000000000..616d41d672
--- /dev/null
+++ b/common/eth2_network_config/built_in_network_configs/holesky/boot_enr.yaml
@@ -0,0 +1,8 @@
+# EF
+- enr:-Iq4QJk4WqRkjsX5c2CXtOra6HnxN-BMXnWhmhEQO9Bn9iABTJGdjUOurM7Btj1ouKaFkvTRoju5vz2GPmVON2dffQKGAX53x8JigmlkgnY0gmlwhLKAlv6Jc2VjcDI1NmsxoQK6S-Cii_KmfFdUJL2TANL3ksaKUnNXvTCv1tLwXs0QgIN1ZHCCIyk
+- enr:-KG4QF6d6vMSboSujAXTI4vYqArccm0eIlXfcxf2Lx_VE1q6IkQo_2D5LAO3ZSBVUs0w5rrVDmABJZuMzISe_pZundADhGV0aDKQqX6DZjABcAAAAQAAAAAAAIJpZIJ2NIJpcISygIjpiXNlY3AyNTZrMaEDF3aSa7QSCvdqLpANNd8GML4PLEZVg45fKQwMWhDZjd2DdGNwgiMog3VkcIIjKA
+- enr:-Ly4QJLXSSAj3ggPBIcodvBU6IyfpU_yW7E9J-5syoJorBuvcYj_Fokcjr303bQoTdWXADf8po0ssh75Mr5wVGzZZsMBh2F0dG5ldHOIAAAAAAAAAACEZXRoMpCpfoNmMAFwAAABAAAAAAAAgmlkgnY0gmlwhJK-DYCJc2VjcDI1NmsxoQJrIlXIQDvQ6t9yDySqJYDXgZgLXzTvq8W7OI51jfmxJohzeW5jbmV0cwCDdGNwgiMog3VkcIIjKA
+# Teku
+- enr:-LK4QMlzEff6d-M0A1pSFG5lJ2c56i_I-ZftdojZbW3ehkGNM4pkQuHQqzVvF1BG9aDjIakjnmO23mCBFFZ2w5zOsugEh2F0dG5ldHOIAAAAAAYAAACEZXRoMpCpfoNmMAFwAAABAAAAAAAAgmlkgnY0gmlwhKyuI_mJc2VjcDI1NmsxoQIH1kQRCZW-4AIVyAeXj5o49m_IqNFKRHp6tSpfXMUrSYN0Y3CCIyiDdWRwgiMo
+# Sigma Prime
+- enr:-Le4QI88slOwzz66Ksq8Vnz324DPb1BzSiY-WYPvnoJIl-lceW9bmSJnwDzgNbCjp5wsBigg76x4tValvGgQPxxSjrMBhGV0aDKQqX6DZjABcAAAAQAAAAAAAIJpZIJ2NIJpcIQ5gR6Wg2lwNpAgAUHQBwEQAAAAAAAAADR-iXNlY3AyNTZrMaEDPMSNdcL92uNIyCsS177Z6KTXlbZakQqxv3aQcWawNXeDdWRwgiMohHVkcDaCI4I
diff --git a/common/eth2_network_config/built_in_network_configs/holesky/config.yaml b/common/eth2_network_config/built_in_network_configs/holesky/config.yaml
new file mode 100644
index 0000000000..a6bfd87ade
--- /dev/null
+++ b/common/eth2_network_config/built_in_network_configs/holesky/config.yaml
@@ -0,0 +1,117 @@
+# Extends the mainnet preset
+PRESET_BASE: 'mainnet'
+CONFIG_NAME: holesky
+
+# Genesis
+# ---------------------------------------------------------------
+# `2**14` (= 16,384)
+MIN_GENESIS_ACTIVE_VALIDATOR_COUNT: 16384
+# Sep-15-2023 13:55:00 +UTC
+MIN_GENESIS_TIME: 1694786100
+GENESIS_FORK_VERSION: 0x00017000
+# Genesis delay 5 mins
+GENESIS_DELAY: 300
+
+
+# Forking
+# ---------------------------------------------------------------
+# Some forks are disabled for now:
+#  - These may be re-assigned to another fork-version later
+#  - Temporarily set to max uint64 value: 2**64 - 1
+
+# Altair
+ALTAIR_FORK_VERSION: 0x10017000
+ALTAIR_FORK_EPOCH: 0
+# Merge
+BELLATRIX_FORK_VERSION: 0x20017000
+BELLATRIX_FORK_EPOCH: 0
+TERMINAL_TOTAL_DIFFICULTY: 0
+TERMINAL_BLOCK_HASH: 0x0000000000000000000000000000000000000000000000000000000000000000
+TERMINAL_BLOCK_HASH_ACTIVATION_EPOCH: 18446744073709551615
+
+# Capella
+CAPELLA_FORK_VERSION: 0x30017000
+CAPELLA_FORK_EPOCH: 256
+
+# DENEB
+DENEB_FORK_VERSION: 0x40017000
+DENEB_FORK_EPOCH: 18446744073709551615
+
+# Time parameters
+# ---------------------------------------------------------------
+# 12 seconds
+SECONDS_PER_SLOT: 12
+# 14 (estimate from Eth1 mainnet)
+SECONDS_PER_ETH1_BLOCK: 14
+# 2**8 (= 256) epochs ~27 hours
+MIN_VALIDATOR_WITHDRAWABILITY_DELAY: 256
+# 2**8 (= 256) epochs ~27 hours
+SHARD_COMMITTEE_PERIOD: 256
+# 2**11 (= 2,048) Eth1 blocks ~8 hours
+ETH1_FOLLOW_DISTANCE: 2048
+
+
+# Validator cycle
+# ---------------------------------------------------------------
+# 2**2 (= 4)
+INACTIVITY_SCORE_BIAS: 4
+# 2**4 (= 16)
+INACTIVITY_SCORE_RECOVERY_RATE: 16
+# 28,000,000,000 Gwei to ensure quicker ejection
+EJECTION_BALANCE: 28000000000
+# 2**2 (= 4)
+MIN_PER_EPOCH_CHURN_LIMIT: 4
+# 2**16 (= 65,536)
+CHURN_LIMIT_QUOTIENT: 65536
+
+# Fork choice
+# ---------------------------------------------------------------
+# 40%
+PROPOSER_SCORE_BOOST: 40
+
+# Deposit contract
+# ---------------------------------------------------------------
+DEPOSIT_CHAIN_ID: 17000
+DEPOSIT_NETWORK_ID: 17000
+DEPOSIT_CONTRACT_ADDRESS: 0x4242424242424242424242424242424242424242
+
+# Networking
+# ---------------------------------------------------------------
+# `10 * 2**20` (= 10485760, 10 MiB)
+GOSSIP_MAX_SIZE: 10485760
+# `2**10` (= 1024)
+MAX_REQUEST_BLOCKS: 1024
+# `2**8` (= 256)
+EPOCHS_PER_SUBNET_SUBSCRIPTION: 256
+# `MIN_VALIDATOR_WITHDRAWABILITY_DELAY + CHURN_LIMIT_QUOTIENT // 2` (= 33024, ~5 months)
+MIN_EPOCHS_FOR_BLOCK_REQUESTS: 33024
+# `10 * 2**20` (=10485760, 10 MiB)
+MAX_CHUNK_SIZE: 10485760
+# 5s
+TTFB_TIMEOUT: 5
+# 10s
+RESP_TIMEOUT: 10
+ATTESTATION_PROPAGATION_SLOT_RANGE: 32
+# 500ms
+MAXIMUM_GOSSIP_CLOCK_DISPARITY: 500
+MESSAGE_DOMAIN_INVALID_SNAPPY: 0x00000000
+MESSAGE_DOMAIN_VALID_SNAPPY: 0x01000000
+# 2 subnets per node
+SUBNETS_PER_NODE: 2
+# 2**8 (= 64)
+ATTESTATION_SUBNET_COUNT: 64
+ATTESTATION_SUBNET_EXTRA_BITS: 0
+# ceillog2(ATTESTATION_SUBNET_COUNT) + ATTESTATION_SUBNET_EXTRA_BITS
+ATTESTATION_SUBNET_PREFIX_BITS: 6
+
+# Deneb
+# `2**7` (=128)
+MAX_REQUEST_BLOCKS_DENEB: 128
+# MAX_REQUEST_BLOCKS_DENEB * MAX_BLOBS_PER_BLOCK
+MAX_REQUEST_BLOB_SIDECARS: 768
+# `2**12` (= 4096 epochs, ~18 days)
+MIN_EPOCHS_FOR_BLOB_SIDECARS_REQUESTS: 4096
+# `6`
+BLOB_SIDECAR_SUBNET_COUNT: 6
+# `uint64(6)`
+MAX_BLOBS_PER_BLOCK: 6
diff --git a/common/eth2_network_config/built_in_network_configs/holesky/deploy_block.txt b/common/eth2_network_config/built_in_network_configs/holesky/deploy_block.txt
new file mode 100644
index 0000000000..573541ac97
--- /dev/null
+++ b/common/eth2_network_config/built_in_network_configs/holesky/deploy_block.txt
@@ -0,0 +1 @@
+0
diff --git a/common/eth2_network_config/built_in_network_configs/mainnet/config.yaml b/common/eth2_network_config/built_in_network_configs/mainnet/config.yaml
index 7b26b30a6c..98984f3b7d 100644
--- a/common/eth2_network_config/built_in_network_configs/mainnet/config.yaml
+++ b/common/eth2_network_config/built_in_network_configs/mainnet/config.yaml
@@ -89,4 +89,14 @@ DEPOSIT_CONTRACT_ADDRESS: 0x00000000219ab540356cBB839Cbe05303d7705Fa
 
 # Network
 # ---------------------------------------------------------------
-SUBNETS_PER_NODE: 2
\ No newline at end of file
+SUBNETS_PER_NODE: 2
+GOSSIP_MAX_SIZE: 10485760
+MIN_EPOCHS_FOR_BLOCK_REQUESTS: 33024
+MAX_CHUNK_SIZE: 10485760
+TTFB_TIMEOUT: 5
+RESP_TIMEOUT: 10
+MESSAGE_DOMAIN_INVALID_SNAPPY: 0x00000000
+MESSAGE_DOMAIN_VALID_SNAPPY: 0x01000000
+ATTESTATION_SUBNET_COUNT: 64
+ATTESTATION_SUBNET_EXTRA_BITS: 0
+ATTESTATION_SUBNET_PREFIX_BITS: 6
diff --git a/common/eth2_network_config/built_in_network_configs/prater/config.yaml b/common/eth2_network_config/built_in_network_configs/prater/config.yaml
index 63b3d45db9..a0dd85fec0 100644
--- a/common/eth2_network_config/built_in_network_configs/prater/config.yaml
+++ b/common/eth2_network_config/built_in_network_configs/prater/config.yaml
@@ -89,4 +89,14 @@ DEPOSIT_CONTRACT_ADDRESS: 0xff50ed3d0ec03aC01D4C79aAd74928BFF48a7b2b
 
 # Network
 # ---------------------------------------------------------------
-SUBNETS_PER_NODE: 2
\ No newline at end of file
+SUBNETS_PER_NODE: 2
+GOSSIP_MAX_SIZE: 10485760
+MIN_EPOCHS_FOR_BLOCK_REQUESTS: 33024
+MAX_CHUNK_SIZE: 10485760
+TTFB_TIMEOUT: 5
+RESP_TIMEOUT: 10
+MESSAGE_DOMAIN_INVALID_SNAPPY: 0x00000000
+MESSAGE_DOMAIN_VALID_SNAPPY: 0x01000000
+ATTESTATION_SUBNET_COUNT: 64
+ATTESTATION_SUBNET_EXTRA_BITS: 0
+ATTESTATION_SUBNET_PREFIX_BITS: 6
diff --git a/common/eth2_network_config/built_in_network_configs/sepolia/config.yaml b/common/eth2_network_config/built_in_network_configs/sepolia/config.yaml
index 8489f085f4..e3674cf7df 100644
--- a/common/eth2_network_config/built_in_network_configs/sepolia/config.yaml
+++ b/common/eth2_network_config/built_in_network_configs/sepolia/config.yaml
@@ -77,4 +77,14 @@ DEPOSIT_CONTRACT_ADDRESS: 0x7f02C3E3c98b133055B8B348B2Ac625669Ed295D
 
 # Network
 # ---------------------------------------------------------------
-SUBNETS_PER_NODE: 2
\ No newline at end of file
+SUBNETS_PER_NODE: 2
+GOSSIP_MAX_SIZE: 10485760
+MIN_EPOCHS_FOR_BLOCK_REQUESTS: 33024
+MAX_CHUNK_SIZE: 10485760
+TTFB_TIMEOUT: 5
+RESP_TIMEOUT: 10
+MESSAGE_DOMAIN_INVALID_SNAPPY: 0x00000000
+MESSAGE_DOMAIN_VALID_SNAPPY: 0x01000000
+ATTESTATION_SUBNET_COUNT: 64
+ATTESTATION_SUBNET_EXTRA_BITS: 0
+ATTESTATION_SUBNET_PREFIX_BITS: 6
diff --git a/common/eth2_network_config/src/lib.rs b/common/eth2_network_config/src/lib.rs
index 7274bbf029..769f656e85 100644
--- a/common/eth2_network_config/src/lib.rs
+++ b/common/eth2_network_config/src/lib.rs
@@ -13,10 +13,20 @@
 
 use discv5::enr::{CombinedKey, Enr};
 use eth2_config::{instantiate_hardcoded_nets, HardcodedNet};
+use pretty_reqwest_error::PrettyReqwestError;
+use reqwest::blocking::Client;
+use sensitive_url::SensitiveUrl;
+use sha2::{Digest, Sha256};
+use slog::{info, warn, Logger};
 use std::fs::{create_dir_all, File};
 use std::io::{Read, Write};
 use std::path::PathBuf;
-use types::{BeaconState, ChainSpec, Config, EthSpec, EthSpecId};
+use std::str::FromStr;
+use std::time::Duration;
+use types::{BeaconState, ChainSpec, Config, EthSpec, EthSpecId, Hash256};
+use url::Url;
+
+pub use eth2_config::GenesisStateSource;
 
 pub const DEPLOY_BLOCK_FILE: &str = "deploy_block.txt";
 pub const BOOT_ENR_FILE: &str = "boot_enr.yaml";
@@ -32,6 +42,35 @@ instantiate_hardcoded_nets!(eth2_config);
 
 pub const DEFAULT_HARDCODED_NETWORK: &str = "mainnet";
 
+/// A simple slice-or-vec enum to avoid cloning the beacon state bytes in the
+/// binary whilst also supporting loading them from a file at runtime.
+#[derive(Clone, PartialEq, Debug)]
+pub enum GenesisStateBytes {
+    Slice(&'static [u8]),
+    Vec(Vec<u8>),
+}
+
+impl AsRef<[u8]> for GenesisStateBytes {
+    fn as_ref(&self) -> &[u8] {
+        match self {
+            GenesisStateBytes::Slice(slice) => slice,
+            GenesisStateBytes::Vec(vec) => vec.as_ref(),
+        }
+    }
+}
+
+impl From<&'static [u8]> for GenesisStateBytes {
+    fn from(slice: &'static [u8]) -> Self {
+        GenesisStateBytes::Slice(slice)
+    }
+}
+
+impl From<Vec<u8>> for GenesisStateBytes {
+    fn from(vec: Vec<u8>) -> Self {
+        GenesisStateBytes::Vec(vec)
+    }
+}
+
 /// Specifies an Eth2 network.
 ///
 /// See the crate-level documentation for more details.
@@ -41,7 +80,8 @@ pub struct Eth2NetworkConfig {
     /// value to be the block number where the first deposit occurs.
     pub deposit_contract_deploy_block: u64,
     pub boot_enr: Option<Vec<Enr<CombinedKey>>>,
-    pub genesis_state_bytes: Option<Vec<u8>>,
+    pub genesis_state_source: GenesisStateSource,
+    pub genesis_state_bytes: Option<GenesisStateBytes>,
     pub config: Config,
 }
 
@@ -65,8 +105,10 @@ impl Eth2NetworkConfig {
                 serde_yaml::from_reader(net.boot_enr)
                     .map_err(|e| format!("Unable to parse boot enr: {:?}", e))?,
             ),
-            genesis_state_bytes: Some(net.genesis_state_bytes.to_vec())
-                .filter(|bytes| !bytes.is_empty()),
+            genesis_state_source: net.genesis_state_source,
+            genesis_state_bytes: Some(net.genesis_state_bytes)
+                .filter(|bytes| !bytes.is_empty())
+                .map(Into::into),
             config: serde_yaml::from_reader(net.config)
                 .map_err(|e| format!("Unable to parse yaml config: {:?}", e))?,
         })
@@ -81,8 +123,37 @@ impl Eth2NetworkConfig {
     }
 
     /// Returns `true` if this configuration contains a `BeaconState`.
-    pub fn beacon_state_is_known(&self) -> bool {
-        self.genesis_state_bytes.is_some()
+    pub fn genesis_state_is_known(&self) -> bool {
+        self.genesis_state_source != GenesisStateSource::Unknown
+    }
+
+    /// The `genesis_validators_root` of the genesis state. May download the
+    /// genesis state if the value is not already available.
+    pub fn genesis_validators_root<E: EthSpec>(
+        &self,
+        genesis_state_url: Option<&str>,
+        timeout: Duration,
+        log: &Logger,
+    ) -> Result<Option<Hash256>, String> {
+        if let GenesisStateSource::Url {
+            genesis_validators_root,
+            ..
+        } = self.genesis_state_source
+        {
+            Hash256::from_str(genesis_validators_root)
+                .map(Option::Some)
+                .map_err(|e| {
+                    format!(
+                        "Unable to parse genesis state genesis_validators_root: {:?}",
+                        e
+                    )
+                })
+        } else {
+            self.genesis_state::<E>(genesis_state_url, timeout, log)?
+                .map(|state| state.genesis_validators_root())
+                .map(Result::Ok)
+                .transpose()
+        }
     }
 
     /// Construct a consolidated `ChainSpec` from the YAML config.
@@ -96,15 +167,65 @@ impl Eth2NetworkConfig {
     }
 
     /// Attempts to deserialize `self.beacon_state`, returning an error if it's missing or invalid.
-    pub fn beacon_state<E: EthSpec>(&self) -> Result<BeaconState<E>, String> {
+    ///
+    /// If the genesis state is configured to be downloaded from a URL, then the
+    /// `genesis_state_url` will override the built-in list of download URLs.
+    pub fn genesis_state<E: EthSpec>(
+        &self,
+        genesis_state_url: Option<&str>,
+        timeout: Duration,
+        log: &Logger,
+    ) -> Result<Option<BeaconState<E>>, String> {
         let spec = self.chain_spec::<E>()?;
-        let genesis_state_bytes = self
-            .genesis_state_bytes
-            .as_ref()
-            .ok_or("Genesis state is unknown")?;
+        match &self.genesis_state_source {
+            GenesisStateSource::Unknown => Ok(None),
+            GenesisStateSource::IncludedBytes => {
+                let state = self
+                    .genesis_state_bytes
+                    .as_ref()
+                    .map(|bytes| {
+                        BeaconState::from_ssz_bytes(bytes.as_ref(), &spec).map_err(|e| {
+                            format!("Built-in genesis state SSZ bytes are invalid: {:?}", e)
+                        })
+                    })
+                    .ok_or("Genesis state bytes missing from Eth2NetworkConfig")??;
+                Ok(Some(state))
+            }
+            GenesisStateSource::Url {
+                urls: built_in_urls,
+                checksum,
+                genesis_validators_root,
+            } => {
+                let checksum = Hash256::from_str(checksum).map_err(|e| {
+                    format!("Unable to parse genesis state bytes checksum: {:?}", e)
+                })?;
+                let bytes = if let Some(specified_url) = genesis_state_url {
+                    download_genesis_state(&[specified_url], timeout, checksum, log)
+                } else {
+                    download_genesis_state(built_in_urls, timeout, checksum, log)
+                }?;
+                let state = BeaconState::from_ssz_bytes(bytes.as_ref(), &spec).map_err(|e| {
+                    format!("Downloaded genesis state SSZ bytes are invalid: {:?}", e)
+                })?;
 
-        BeaconState::from_ssz_bytes(genesis_state_bytes, &spec)
-            .map_err(|e| format!("Genesis state SSZ bytes are invalid: {:?}", e))
+                let genesis_validators_root =
+                    Hash256::from_str(genesis_validators_root).map_err(|e| {
+                        format!(
+                            "Unable to parse genesis state genesis_validators_root: {:?}",
+                            e
+                        )
+                    })?;
+                if state.genesis_validators_root() != genesis_validators_root {
+                    return Err(format!(
+                        "Downloaded genesis validators root {:?} does not match expected {:?}",
+                        state.genesis_validators_root(),
+                        genesis_validators_root
+                    ));
+                }
+
+                Ok(Some(state))
+            }
+        }
     }
 
     /// Write the files to the directory.
@@ -162,7 +283,7 @@ impl Eth2NetworkConfig {
             File::create(&file)
                 .map_err(|e| format!("Unable to create {:?}: {:?}", file, e))
                 .and_then(|mut file| {
-                    file.write_all(genesis_state_bytes)
+                    file.write_all(genesis_state_bytes.as_ref())
                         .map_err(|e| format!("Unable to write {:?}: {:?}", file, e))
                 })?;
         }
@@ -198,7 +319,7 @@ impl Eth2NetworkConfig {
 
         // The genesis state is a special case because it uses SSZ, not YAML.
         let genesis_file_path = base_dir.join(GENESIS_STATE_FILE);
-        let genesis_state_bytes = if genesis_file_path.exists() {
+        let (genesis_state_bytes, genesis_state_source) = if genesis_file_path.exists() {
             let mut bytes = vec![];
             File::open(&genesis_file_path)
                 .map_err(|e| format!("Unable to open {:?}: {:?}", genesis_file_path, e))
@@ -207,20 +328,105 @@ impl Eth2NetworkConfig {
                         .map_err(|e| format!("Unable to read {:?}: {:?}", file, e))
                 })?;
 
-            Some(bytes).filter(|bytes| !bytes.is_empty())
+            let state = Some(bytes).filter(|bytes| !bytes.is_empty());
+            let genesis_state_source = if state.is_some() {
+                GenesisStateSource::IncludedBytes
+            } else {
+                GenesisStateSource::Unknown
+            };
+            (state, genesis_state_source)
         } else {
-            None
+            (None, GenesisStateSource::Unknown)
         };
 
         Ok(Self {
             deposit_contract_deploy_block,
             boot_enr,
-            genesis_state_bytes,
+            genesis_state_source,
+            genesis_state_bytes: genesis_state_bytes.map(Into::into),
             config,
         })
     }
 }
 
+/// Try to download a genesis state from each of the `urls` in the order they
+/// are defined. Return `Ok` if any url returns a response that matches the
+/// given `checksum`.
+fn download_genesis_state(
+    urls: &[&str],
+    timeout: Duration,
+    checksum: Hash256,
+    log: &Logger,
+) -> Result<Vec<u8>, String> {
+    if urls.is_empty() {
+        return Err(
+            "The genesis state is not present in the binary and there are no known download URLs. \
+            Please use --checkpoint-sync-url or --genesis-state-url."
+                .to_string(),
+        );
+    }
+
+    let mut errors = vec![];
+    for url in urls {
+        // URLs are always expected to be the base URL of a server that supports
+        // the beacon-API.
+        let url = parse_state_download_url(url)?;
+        let redacted_url = SensitiveUrl::new(url.clone())
+            .map(|url| url.to_string())
+            .unwrap_or_else(|_| "<REDACTED>".to_string());
+
+        info!(
+            log,
+            "Downloading genesis state";
+            "server" => &redacted_url,
+            "timeout" => ?timeout,
+            "info" => "this may take some time on testnets with large validator counts"
+        );
+
+        let client = Client::new();
+        let response = client
+            .get(url)
+            .header("Accept", "application/octet-stream")
+            .timeout(timeout)
+            .send()
+            .and_then(|r| r.error_for_status().and_then(|r| r.bytes()));
+
+        match response {
+            Ok(bytes) => {
+                // Check the server response against our local checksum.
+                if Sha256::digest(bytes.as_ref())[..] == checksum[..] {
+                    return Ok(bytes.into());
+                } else {
+                    warn!(
+                        log,
+                        "Genesis state download failed";
+                        "server" => &redacted_url,
+                        "timeout" => ?timeout,
+                    );
+                    errors.push(format!(
+                        "Response from {} did not match local checksum",
+                        redacted_url
+                    ))
+                }
+            }
+            Err(e) => errors.push(PrettyReqwestError::from(e).to_string()),
+        }
+    }
+    Err(format!(
+        "Unable to download a genesis state from {} source(s): {}",
+        errors.len(),
+        errors.join(",")
+    ))
+}
+
+/// Parses the `url` and joins the necessary state download path.
+fn parse_state_download_url(url: &str) -> Result<Url, String> {
+    Url::parse(url)
+        .map_err(|e| format!("Invalid genesis state URL: {:?}", e))?
+        .join("eth/v2/debug/beacon/states/genesis")
+        .map_err(|e| format!("Failed to append genesis state path to URL: {:?}", e))
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;
@@ -260,7 +466,9 @@ mod tests {
     #[test]
     fn mainnet_genesis_state() {
         let config = Eth2NetworkConfig::from_hardcoded_net(&MAINNET).unwrap();
-        config.beacon_state::<E>().expect("beacon state can decode");
+        config
+            .genesis_state::<E>(None, Duration::from_secs(1), &logging::test_logger())
+            .expect("beacon state can decode");
     }
 
     #[test]
@@ -274,10 +482,10 @@ mod tests {
     fn hard_coded_nets_work() {
         for net in HARDCODED_NETS {
             let config = Eth2NetworkConfig::from_hardcoded_net(net)
-                .unwrap_or_else(|_| panic!("{:?}", net.name));
+                .unwrap_or_else(|e| panic!("{:?}: {:?}", net.name, e));
 
             // Ensure we can parse the YAML config to a chain spec.
-            if net.name == types::GNOSIS {
+            if config.config.preset_base == types::GNOSIS {
                 config.chain_spec::<GnosisEthSpec>().unwrap();
             } else {
                 config.chain_spec::<MainnetEthSpec>().unwrap();
@@ -285,10 +493,25 @@ mod tests {
 
             assert_eq!(
                 config.genesis_state_bytes.is_some(),
-                net.genesis_is_known,
+                net.genesis_state_source == GenesisStateSource::IncludedBytes,
                 "{:?}",
                 net.name
             );
+
+            if let GenesisStateSource::Url {
+                urls,
+                checksum,
+                genesis_validators_root,
+            } = net.genesis_state_source
+            {
+                Hash256::from_str(checksum).expect("the checksum must be a valid 32-byte value");
+                Hash256::from_str(genesis_validators_root)
+                    .expect("the GVR must be a valid 32-byte value");
+                for url in urls {
+                    parse_state_download_url(url).expect("url must be valid");
+                }
+            }
+
             assert_eq!(config.config.config_name, Some(net.config_dir.to_string()));
         }
     }
@@ -324,10 +547,20 @@ mod tests {
         let base_dir = temp_dir.path().join("my_testnet");
         let deposit_contract_deploy_block = 42;
 
+        let genesis_state_source = if genesis_state.is_some() {
+            GenesisStateSource::IncludedBytes
+        } else {
+            GenesisStateSource::Unknown
+        };
+
         let testnet: Eth2NetworkConfig = Eth2NetworkConfig {
             deposit_contract_deploy_block,
             boot_enr,
-            genesis_state_bytes: genesis_state.as_ref().map(Encode::as_ssz_bytes),
+            genesis_state_source,
+            genesis_state_bytes: genesis_state
+                .as_ref()
+                .map(Encode::as_ssz_bytes)
+                .map(Into::into),
             config,
         };
 
diff --git a/common/lighthouse_version/src/lib.rs b/common/lighthouse_version/src/lib.rs
index e874432fbc..567714e5ca 100644
--- a/common/lighthouse_version/src/lib.rs
+++ b/common/lighthouse_version/src/lib.rs
@@ -17,8 +17,8 @@ pub const VERSION: &str = git_version!(
         // NOTE: using --match instead of --exclude for compatibility with old Git
         "--match=thiswillnevermatchlol"
     ],
-    prefix = "Lighthouse/v4.3.0-",
-    fallback = "Lighthouse/v4.3.0"
+    prefix = "Lighthouse/v4.4.1-",
+    fallback = "Lighthouse/v4.4.1"
 );
 
 /// Returns `VERSION`, but with platform information appended to the end.
diff --git a/common/logging/Cargo.toml b/common/logging/Cargo.toml
index b6179d9e78..0e158f58ff 100644
--- a/common/logging/Cargo.toml
+++ b/common/logging/Cargo.toml
@@ -17,6 +17,6 @@ sloggers = { version = "2.1.1", features = ["json"] }
 slog-async = "2.7.0"
 take_mut = "0.2.2"
 parking_lot = "0.12.1"
-serde = "1.0.153" 
+serde = "1.0.153"
 serde_json = "1.0.94"
-chrono = "0.4.23"
+chrono = { version = "0.4", default-features = false, features = ["clock", "std"] }
diff --git a/common/pretty_reqwest_error/src/lib.rs b/common/pretty_reqwest_error/src/lib.rs
index 4c605f38ae..0aaee5965e 100644
--- a/common/pretty_reqwest_error/src/lib.rs
+++ b/common/pretty_reqwest_error/src/lib.rs
@@ -55,6 +55,12 @@ impl fmt::Debug for PrettyReqwestError {
     }
 }
 
+impl fmt::Display for PrettyReqwestError {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "{:?}", self)
+    }
+}
+
 impl From<reqwest::Error> for PrettyReqwestError {
     fn from(inner: reqwest::Error) -> Self {
         Self(inner)
diff --git a/common/validator_dir/Cargo.toml b/common/validator_dir/Cargo.toml
index 39a14e2837..8accddfcb9 100644
--- a/common/validator_dir/Cargo.toml
+++ b/common/validator_dir/Cargo.toml
@@ -20,6 +20,7 @@ tree_hash = "0.5.0"
 hex = "0.4.2"
 derivative = "2.1.1"
 lockfile = { path = "../lockfile" }
+directory = { path = "../directory" }
 
 [dev-dependencies]
 tempfile = "3.1.0"
diff --git a/common/validator_dir/src/builder.rs b/common/validator_dir/src/builder.rs
index 2b3f670c70..bccf9086ac 100644
--- a/common/validator_dir/src/builder.rs
+++ b/common/validator_dir/src/builder.rs
@@ -1,6 +1,7 @@
 use crate::{Error as DirError, ValidatorDir};
 use bls::get_withdrawal_credentials;
 use deposit_contract::{encode_eth1_tx_data, Error as DepositError};
+use directory::ensure_dir_exists;
 use eth2_keystore::{Error as KeystoreError, Keystore, KeystoreBuilder, PlainText};
 use filesystem::create_with_600_perms;
 use rand::{distributions::Alphanumeric, Rng};
@@ -41,6 +42,7 @@ pub enum Error {
     #[cfg(feature = "insecure_keys")]
     InsecureKeysError(String),
     MissingPasswordDir,
+    UnableToCreatePasswordDir(String),
 }
 
 impl From<KeystoreError> for Error {
@@ -78,6 +80,13 @@ impl<'a> Builder<'a> {
         self
     }
 
+    /// Optionally supply a directory in which to store the passwords for the validator keystores.
+    /// If `None` is provided, do not store the password.
+    pub fn password_dir_opt(mut self, password_dir_opt: Option<PathBuf>) -> Self {
+        self.password_dir = password_dir_opt;
+        self
+    }
+
     /// Build the `ValidatorDir` use the given `keystore` which can be unlocked with `password`.
     ///
     /// The builder will not necessarily check that `password` can unlock `keystore`.
@@ -153,6 +162,10 @@ impl<'a> Builder<'a> {
             create_dir_all(&dir).map_err(Error::UnableToCreateDir)?;
         }
 
+        if let Some(password_dir) = &self.password_dir {
+            ensure_dir_exists(password_dir).map_err(Error::UnableToCreatePasswordDir)?;
+        }
+
         // The withdrawal keystore must be initialized in order to store it or create an eth1
         // deposit.
         if (self.store_withdrawal_keystore || self.deposit_info.is_some())
@@ -234,7 +247,7 @@ impl<'a> Builder<'a> {
                 if self.store_withdrawal_keystore {
                     // Write the withdrawal password to file.
                     write_password_to_file(
-                        password_dir.join(withdrawal_keypair.pk.as_hex_string()),
+                        keystore_password_path(password_dir, &withdrawal_keystore),
                         withdrawal_password.as_bytes(),
                     )?;
 
@@ -250,7 +263,7 @@ impl<'a> Builder<'a> {
         if let Some(password_dir) = self.password_dir.as_ref() {
             // Write the voting password to file.
             write_password_to_file(
-                password_dir.join(format!("0x{}", voting_keystore.pubkey())),
+                keystore_password_path(password_dir, &voting_keystore),
                 voting_password.as_bytes(),
             )?;
         }
@@ -262,6 +275,12 @@ impl<'a> Builder<'a> {
     }
 }
 
+pub fn keystore_password_path<P: AsRef<Path>>(password_dir: P, keystore: &Keystore) -> PathBuf {
+    password_dir
+        .as_ref()
+        .join(format!("0x{}", keystore.pubkey()))
+}
+
 /// Writes a JSON keystore to file.
 fn write_keystore_to_file(path: PathBuf, keystore: &Keystore) -> Result<(), Error> {
     if path.exists() {
diff --git a/common/validator_dir/src/lib.rs b/common/validator_dir/src/lib.rs
index a39d322834..4aa0d590a1 100644
--- a/common/validator_dir/src/lib.rs
+++ b/common/validator_dir/src/lib.rs
@@ -15,6 +15,6 @@ pub use crate::validator_dir::{
     ETH1_DEPOSIT_TX_HASH_FILE,
 };
 pub use builder::{
-    Builder, Error as BuilderError, ETH1_DEPOSIT_DATA_FILE, VOTING_KEYSTORE_FILE,
-    WITHDRAWAL_KEYSTORE_FILE,
+    keystore_password_path, Builder, Error as BuilderError, ETH1_DEPOSIT_DATA_FILE,
+    VOTING_KEYSTORE_FILE, WITHDRAWAL_KEYSTORE_FILE,
 };
diff --git a/common/validator_dir/src/validator_dir.rs b/common/validator_dir/src/validator_dir.rs
index cb1ddde24a..24b317dcfe 100644
--- a/common/validator_dir/src/validator_dir.rs
+++ b/common/validator_dir/src/validator_dir.rs
@@ -1,5 +1,5 @@
 use crate::builder::{
-    ETH1_DEPOSIT_AMOUNT_FILE, ETH1_DEPOSIT_DATA_FILE, VOTING_KEYSTORE_FILE,
+    keystore_password_path, ETH1_DEPOSIT_AMOUNT_FILE, ETH1_DEPOSIT_DATA_FILE, VOTING_KEYSTORE_FILE,
     WITHDRAWAL_KEYSTORE_FILE,
 };
 use deposit_contract::decode_eth1_tx_data;
@@ -219,9 +219,7 @@ pub fn unlock_keypair<P: AsRef<Path>>(
     )
     .map_err(Error::UnableToReadKeystore)?;
 
-    let password_path = password_dir
-        .as_ref()
-        .join(format!("0x{}", keystore.pubkey()));
+    let password_path = keystore_password_path(password_dir, &keystore);
     let password: PlainText = read(&password_path)
         .map_err(|_| Error::UnableToReadPassword(password_path))?
         .into();
diff --git a/common/warp_utils/src/cors.rs b/common/warp_utils/src/cors.rs
index 314ea9c8f7..55043dfd7d 100644
--- a/common/warp_utils/src/cors.rs
+++ b/common/warp_utils/src/cors.rs
@@ -10,10 +10,14 @@ pub fn set_builder_origins(
     default_origin: (IpAddr, u16),
 ) -> Result<Builder, String> {
     if let Some(allow_origin) = allow_origin {
-        let origins = allow_origin
-            .split(',')
-            .map(|s| verify_cors_origin_str(s).map(|_| s))
-            .collect::<Result<Vec<_>, _>>()?;
+        let mut origins = vec![];
+        for origin in allow_origin.split(',') {
+            verify_cors_origin_str(origin)?;
+            if origin == "*" {
+                return Ok(builder.allow_any_origin());
+            }
+            origins.push(origin)
+        }
         Ok(builder.allow_origins(origins))
     } else {
         let origin = match default_origin.0 {
diff --git a/common/warp_utils/src/metrics.rs b/common/warp_utils/src/metrics.rs
index 1b9d89db91..d93b74ca95 100644
--- a/common/warp_utils/src/metrics.rs
+++ b/common/warp_utils/src/metrics.rs
@@ -87,7 +87,7 @@ pub fn scrape_process_health_metrics() {
     // This will silently fail if we are unable to observe the health. This is desired behaviour
     // since we don't support `Health` for all platforms.
     if let Ok(health) = ProcessHealth::observe() {
-        set_gauge(&PROCESS_NUM_THREADS, health.pid_num_threads as i64);
+        set_gauge(&PROCESS_NUM_THREADS, health.pid_num_threads);
         set_gauge(&PROCESS_RES_MEM, health.pid_mem_resident_set_size as i64);
         set_gauge(&PROCESS_VIRT_MEM, health.pid_mem_virtual_memory_size as i64);
         set_gauge(&PROCESS_SECONDS, health.pid_process_seconds_total as i64);
diff --git a/consensus/fork_choice/src/fork_choice.rs b/consensus/fork_choice/src/fork_choice.rs
index e60774fc86..ea3a58127b 100644
--- a/consensus/fork_choice/src/fork_choice.rs
+++ b/consensus/fork_choice/src/fork_choice.rs
@@ -289,9 +289,10 @@ pub enum AttestationFromBlock {
     False,
 }
 
-/// Parameters which are cached between calls to `Self::get_head`.
+/// Parameters which are cached between calls to `ForkChoice::get_head`.
 #[derive(Clone, Copy)]
 pub struct ForkchoiceUpdateParameters {
+    /// The most recent result of running `ForkChoice::get_head`.
     pub head_root: Hash256,
     pub head_hash: Option<ExecutionBlockHash>,
     pub justified_hash: Option<ExecutionBlockHash>,
@@ -324,8 +325,6 @@ pub struct ForkChoice<T, E> {
     queued_attestations: Vec<QueuedAttestation>,
     /// Stores a cache of the values required to be sent to the execution layer.
     forkchoice_update_parameters: ForkchoiceUpdateParameters,
-    /// The most recent result of running `Self::get_head`.
-    head_block_root: Hash256,
     _phantom: PhantomData<E>,
 }
 
@@ -356,7 +355,7 @@ where
         spec: &ChainSpec,
     ) -> Result<Self, Error<T::Error>> {
         // Sanity check: the anchor must lie on an epoch boundary.
-        if anchor_block.slot() % E::slots_per_epoch() != 0 {
+        if anchor_state.slot() % E::slots_per_epoch() != 0 {
             return Err(Error::InvalidAnchor {
                 block_slot: anchor_block.slot(),
                 state_slot: anchor_state.slot(),
@@ -392,6 +391,7 @@ where
         let current_slot = current_slot.unwrap_or_else(|| fc_store.get_current_slot());
 
         let proto_array = ProtoArrayForkChoice::new::<E>(
+            current_slot,
             finalized_block_slot,
             finalized_block_state_root,
             *fc_store.justified_checkpoint(),
@@ -410,14 +410,13 @@ where
                 head_hash: None,
                 justified_hash: None,
                 finalized_hash: None,
+                // This will be updated during the next call to `Self::get_head`.
                 head_root: Hash256::zero(),
             },
-            // This will be updated during the next call to `Self::get_head`.
-            head_block_root: Hash256::zero(),
             _phantom: PhantomData,
         };
 
-        // Ensure that `fork_choice.head_block_root` is updated.
+        // Ensure that `fork_choice.forkchoice_update_parameters.head_root` is updated.
         fork_choice.get_head(current_slot, spec)?;
 
         Ok(fork_choice)
@@ -466,13 +465,10 @@ where
                 // for lower slots to account for skip slots.
                 .find(|(_, slot)| *slot <= ancestor_slot)
                 .map(|(root, _)| root)),
-            Ordering::Less => Ok(Some(block_root)),
-            Ordering::Equal =>
             // Root is older than queried slot, thus a skip slot. Return most recent root prior
             // to slot.
-            {
-                Ok(Some(block_root))
-            }
+            Ordering::Less => Ok(Some(block_root)),
+            Ordering::Equal => Ok(Some(block_root)),
         }
     }
 
@@ -505,8 +501,6 @@ where
             spec,
         )?;
 
-        self.head_block_root = head_root;
-
         // Cache some values for the next forkchoiceUpdate call to the execution layer.
         let head_hash = self
             .get_block(&head_root)
@@ -610,7 +604,7 @@ where
     /// have *differing* finalized and justified information.
     pub fn cached_fork_choice_view(&self) -> ForkChoiceView {
         ForkChoiceView {
-            head_block_root: self.head_block_root,
+            head_block_root: self.forkchoice_update_parameters.head_root,
             justified_checkpoint: self.justified_checkpoint(),
             finalized_checkpoint: self.finalized_checkpoint(),
         }
@@ -756,7 +750,7 @@ where
             .unrealized_justified_checkpoint
             .zip(parent_block.unrealized_finalized_checkpoint)
             .filter(|(parent_justified, parent_finalized)| {
-                parent_justified.epoch == block_epoch && parent_finalized.epoch + 1 >= block_epoch
+                parent_justified.epoch == block_epoch && parent_finalized.epoch + 1 == block_epoch
             });
 
         let (unrealized_justified_checkpoint, unrealized_finalized_checkpoint) = if let Some((
@@ -1521,10 +1515,9 @@ where
                 head_hash: None,
                 justified_hash: None,
                 finalized_hash: None,
+                // Will be updated in the following call to `Self::get_head`.
                 head_root: Hash256::zero(),
             },
-            // Will be updated in the following call to `Self::get_head`.
-            head_block_root: Hash256::zero(),
             _phantom: PhantomData,
         };
 
diff --git a/consensus/proto_array/src/fork_choice_test_definition.rs b/consensus/proto_array/src/fork_choice_test_definition.rs
index 157f072ad3..98d43e4850 100644
--- a/consensus/proto_array/src/fork_choice_test_definition.rs
+++ b/consensus/proto_array/src/fork_choice_test_definition.rs
@@ -80,6 +80,7 @@ impl ForkChoiceTestDefinition {
         let junk_shuffling_id =
             AttestationShufflingId::from_components(Epoch::new(0), Hash256::zero());
         let mut fork_choice = ProtoArrayForkChoice::new::<MainnetEthSpec>(
+            self.finalized_block_slot,
             self.finalized_block_slot,
             Hash256::zero(),
             self.justified_checkpoint,
diff --git a/consensus/proto_array/src/proto_array.rs b/consensus/proto_array/src/proto_array.rs
index 88111b461d..7b6afb94f5 100644
--- a/consensus/proto_array/src/proto_array.rs
+++ b/consensus/proto_array/src/proto_array.rs
@@ -884,7 +884,7 @@ impl ProtoArray {
                         }
                     } else {
                         // Choose the winner by weight.
-                        if child.weight >= best_child.weight {
+                        if child.weight > best_child.weight {
                             change_to_child
                         } else {
                             no_change
@@ -910,7 +910,7 @@ impl ProtoArray {
         Ok(())
     }
 
-    /// Indicates if the node itself is viable for the head, or if it's best descendant is viable
+    /// Indicates if the node itself is viable for the head, or if its best descendant is viable
     /// for the head.
     fn node_leads_to_viable_head<E: EthSpec>(
         &self,
diff --git a/consensus/proto_array/src/proto_array_fork_choice.rs b/consensus/proto_array/src/proto_array_fork_choice.rs
index fe831b3c35..5911e50fcd 100644
--- a/consensus/proto_array/src/proto_array_fork_choice.rs
+++ b/consensus/proto_array/src/proto_array_fork_choice.rs
@@ -345,6 +345,7 @@ pub struct ProtoArrayForkChoice {
 impl ProtoArrayForkChoice {
     #[allow(clippy::too_many_arguments)]
     pub fn new<E: EthSpec>(
+        current_slot: Slot,
         finalized_block_slot: Slot,
         finalized_block_state_root: Hash256,
         justified_checkpoint: Checkpoint,
@@ -380,7 +381,7 @@ impl ProtoArrayForkChoice {
         };
 
         proto_array
-            .on_block::<E>(block, finalized_block_slot)
+            .on_block::<E>(block, current_slot)
             .map_err(|e| format!("Failed to add finalized block to proto_array: {:?}", e))?;
 
         Ok(Self {
@@ -983,6 +984,7 @@ mod test_compute_deltas {
         };
 
         let mut fc = ProtoArrayForkChoice::new::<MainnetEthSpec>(
+            genesis_slot,
             genesis_slot,
             state_root,
             genesis_checkpoint,
@@ -1108,6 +1110,7 @@ mod test_compute_deltas {
         };
 
         let mut fc = ProtoArrayForkChoice::new::<MainnetEthSpec>(
+            genesis_slot,
             genesis_slot,
             junk_state_root,
             genesis_checkpoint,
diff --git a/consensus/safe_arith/src/iter.rs b/consensus/safe_arith/src/iter.rs
index 1fc3d3a1a7..d5ee51b588 100644
--- a/consensus/safe_arith/src/iter.rs
+++ b/consensus/safe_arith/src/iter.rs
@@ -28,10 +28,10 @@ mod test {
 
     #[test]
     fn unsigned_sum_small() {
-        let v = vec![400u64, 401, 402, 403, 404, 405, 406];
+        let arr = [400u64, 401, 402, 403, 404, 405, 406];
         assert_eq!(
-            v.iter().copied().safe_sum().unwrap(),
-            v.iter().copied().sum()
+            arr.iter().copied().safe_sum().unwrap(),
+            arr.iter().copied().sum()
         );
     }
 
@@ -61,10 +61,10 @@ mod test {
 
     #[test]
     fn signed_sum_almost_overflow() {
-        let v = vec![i64::MIN, 1, -1i64, i64::MAX, i64::MAX, 1];
+        let arr = [i64::MIN, 1, -1i64, i64::MAX, i64::MAX, 1];
         assert_eq!(
-            v.iter().copied().safe_sum().unwrap(),
-            v.iter().copied().sum()
+            arr.iter().copied().safe_sum().unwrap(),
+            arr.iter().copied().sum()
         );
     }
 }
diff --git a/consensus/state_processing/src/common/base.rs b/consensus/state_processing/src/common/base.rs
index b5cb382721..a8d04ad6cd 100644
--- a/consensus/state_processing/src/common/base.rs
+++ b/consensus/state_processing/src/common/base.rs
@@ -17,3 +17,15 @@ pub fn get_base_reward<T: EthSpec>(
         .safe_div(spec.base_rewards_per_epoch)
         .map_err(Into::into)
 }
+
+pub fn get_base_reward_from_effective_balance<T: EthSpec>(
+    effective_balance: u64,
+    total_active_balance: u64,
+    spec: &ChainSpec,
+) -> Result<u64, BeaconStateError> {
+    effective_balance
+        .safe_mul(spec.base_reward_factor)?
+        .safe_div(total_active_balance.integer_sqrt())?
+        .safe_div(spec.base_rewards_per_epoch)
+        .map_err(Into::into)
+}
diff --git a/consensus/state_processing/src/lib.rs b/consensus/state_processing/src/lib.rs
index 7340206a34..a3ee725406 100644
--- a/consensus/state_processing/src/lib.rs
+++ b/consensus/state_processing/src/lib.rs
@@ -2,7 +2,7 @@
 #![cfg_attr(
     not(test),
     deny(
-        clippy::integer_arithmetic,
+        clippy::arithmetic_side_effects,
         clippy::disallowed_methods,
         clippy::indexing_slicing,
         clippy::unwrap_used,
diff --git a/consensus/state_processing/src/per_block_processing/block_signature_verifier.rs b/consensus/state_processing/src/per_block_processing/block_signature_verifier.rs
index 709302eec1..22309334fa 100644
--- a/consensus/state_processing/src/per_block_processing/block_signature_verifier.rs
+++ b/consensus/state_processing/src/per_block_processing/block_signature_verifier.rs
@@ -1,4 +1,4 @@
-#![allow(clippy::integer_arithmetic)]
+#![allow(clippy::arithmetic_side_effects)]
 
 use super::signature_sets::{Error as SignatureSetError, *};
 use crate::per_block_processing::errors::{AttestationInvalid, BlockOperationError};
diff --git a/consensus/state_processing/src/per_block_processing/tests.rs b/consensus/state_processing/src/per_block_processing/tests.rs
index ddb9ca6ad5..16fa2462f5 100644
--- a/consensus/state_processing/src/per_block_processing/tests.rs
+++ b/consensus/state_processing/src/per_block_processing/tests.rs
@@ -960,7 +960,7 @@ async fn fork_spanning_exit() {
     spec.bellatrix_fork_epoch = Some(Epoch::new(4));
     spec.shard_committee_period = 0;
 
-    let harness = BeaconChainHarness::builder(MainnetEthSpec::default())
+    let harness = BeaconChainHarness::builder(MainnetEthSpec)
         .spec(spec.clone())
         .deterministic_keypairs(VALIDATOR_COUNT)
         .mock_execution_layer()
diff --git a/consensus/state_processing/src/per_epoch_processing/altair/inactivity_updates.rs b/consensus/state_processing/src/per_epoch_processing/altair/inactivity_updates.rs
index 967f642e85..a895567d12 100644
--- a/consensus/state_processing/src/per_epoch_processing/altair/inactivity_updates.rs
+++ b/consensus/state_processing/src/per_epoch_processing/altair/inactivity_updates.rs
@@ -34,7 +34,7 @@ pub fn process_inactivity_updates<T: EthSpec>(
                 .safe_add_assign(spec.inactivity_score_bias)?;
         }
         // Decrease the score of all validators for forgiveness when not during a leak
-        if !state.is_in_inactivity_leak(previous_epoch, spec) {
+        if !state.is_in_inactivity_leak(previous_epoch, spec)? {
             let inactivity_score = state.get_inactivity_score_mut(index)?;
             inactivity_score
                 .safe_sub_assign(min(spec.inactivity_score_recovery_rate, *inactivity_score))?;
diff --git a/consensus/state_processing/src/per_epoch_processing/altair/participation_cache.rs b/consensus/state_processing/src/per_epoch_processing/altair/participation_cache.rs
index a5caddd045..d67e7874cb 100644
--- a/consensus/state_processing/src/per_epoch_processing/altair/participation_cache.rs
+++ b/consensus/state_processing/src/per_epoch_processing/altair/participation_cache.rs
@@ -111,8 +111,8 @@ impl SingleEpochParticipationCache {
         current_epoch: Epoch,
         relative_epoch: RelativeEpoch,
     ) -> Result<(), BeaconStateError> {
-        let val_balance = state.get_effective_balance(val_index)?;
         let validator = state.get_validator(val_index)?;
+        let val_balance = validator.effective_balance;
 
         // Sanity check to ensure the validator is active.
         let epoch = relative_epoch.into_epoch(current_epoch);
diff --git a/consensus/state_processing/src/per_epoch_processing/altair/rewards_and_penalties.rs b/consensus/state_processing/src/per_epoch_processing/altair/rewards_and_penalties.rs
index e2aa67a619..19d57130c9 100644
--- a/consensus/state_processing/src/per_epoch_processing/altair/rewards_and_penalties.rs
+++ b/consensus/state_processing/src/per_epoch_processing/altair/rewards_and_penalties.rs
@@ -77,7 +77,7 @@ pub fn get_flag_index_deltas<T: EthSpec>(
         let mut delta = Delta::default();
 
         if unslashed_participating_indices.contains(index)? {
-            if !state.is_in_inactivity_leak(previous_epoch, spec) {
+            if !state.is_in_inactivity_leak(previous_epoch, spec)? {
                 let reward_numerator = base_reward
                     .safe_mul(weight)?
                     .safe_mul(unslashed_participating_increments)?;
diff --git a/consensus/state_processing/src/per_epoch_processing/base.rs b/consensus/state_processing/src/per_epoch_processing/base.rs
index 680563ce74..c5864bd1ef 100644
--- a/consensus/state_processing/src/per_epoch_processing/base.rs
+++ b/consensus/state_processing/src/per_epoch_processing/base.rs
@@ -36,7 +36,7 @@ pub fn process_epoch<T: EthSpec>(
     justification_and_finalization_state.apply_changes_to_state(state);
 
     // Rewards and Penalties.
-    process_rewards_and_penalties(state, &mut validator_statuses, spec)?;
+    process_rewards_and_penalties(state, &validator_statuses, spec)?;
 
     // Registry Updates.
     process_registry_updates(state, spec)?;
diff --git a/consensus/state_processing/src/per_epoch_processing/base/rewards_and_penalties.rs b/consensus/state_processing/src/per_epoch_processing/base/rewards_and_penalties.rs
index e7a4d9c4dc..74c96d8aee 100644
--- a/consensus/state_processing/src/per_epoch_processing/base/rewards_and_penalties.rs
+++ b/consensus/state_processing/src/per_epoch_processing/base/rewards_and_penalties.rs
@@ -45,7 +45,7 @@ impl AttestationDelta {
 /// Apply attester and proposer rewards.
 pub fn process_rewards_and_penalties<T: EthSpec>(
     state: &mut BeaconState<T>,
-    validator_statuses: &mut ValidatorStatuses,
+    validator_statuses: &ValidatorStatuses,
     spec: &ChainSpec,
 ) -> Result<(), Error> {
     if state.current_epoch() == T::genesis_epoch() {
@@ -59,7 +59,7 @@ pub fn process_rewards_and_penalties<T: EthSpec>(
         return Err(Error::ValidatorStatusesInconsistent);
     }
 
-    let deltas = get_attestation_deltas(state, validator_statuses, spec)?;
+    let deltas = get_attestation_deltas_all(state, validator_statuses, spec)?;
 
     // Apply the deltas, erroring on overflow above but not on overflow below (saturating at 0
     // instead).
@@ -73,10 +73,41 @@ pub fn process_rewards_and_penalties<T: EthSpec>(
 }
 
 /// Apply rewards for participation in attestations during the previous epoch.
-pub fn get_attestation_deltas<T: EthSpec>(
+pub fn get_attestation_deltas_all<T: EthSpec>(
     state: &BeaconState<T>,
     validator_statuses: &ValidatorStatuses,
     spec: &ChainSpec,
+) -> Result<Vec<AttestationDelta>, Error> {
+    get_attestation_deltas(state, validator_statuses, None, spec)
+}
+
+/// Apply rewards for participation in attestations during the previous epoch, and only compute
+/// rewards for a subset of validators.
+pub fn get_attestation_deltas_subset<T: EthSpec>(
+    state: &BeaconState<T>,
+    validator_statuses: &ValidatorStatuses,
+    validators_subset: &Vec<usize>,
+    spec: &ChainSpec,
+) -> Result<Vec<(usize, AttestationDelta)>, Error> {
+    get_attestation_deltas(state, validator_statuses, Some(validators_subset), spec).map(|deltas| {
+        deltas
+            .into_iter()
+            .enumerate()
+            .filter(|(index, _)| validators_subset.contains(index))
+            .collect()
+    })
+}
+
+/// Apply rewards for participation in attestations during the previous epoch.
+/// If `maybe_validators_subset` specified, only the deltas for the specified validator subset is
+/// returned, otherwise deltas for all validators are returned.
+///
+/// Returns a vec of validator indices to `AttestationDelta`.
+fn get_attestation_deltas<T: EthSpec>(
+    state: &BeaconState<T>,
+    validator_statuses: &ValidatorStatuses,
+    maybe_validators_subset: Option<&Vec<usize>>,
+    spec: &ChainSpec,
 ) -> Result<Vec<AttestationDelta>, Error> {
     let previous_epoch = state.previous_epoch();
     let finality_delay = state
@@ -88,6 +119,13 @@ pub fn get_attestation_deltas<T: EthSpec>(
 
     let total_balances = &validator_statuses.total_balances;
 
+    // Ignore validator if a subset is specified and validator is not in the subset
+    let include_validator_delta = |idx| match maybe_validators_subset.as_ref() {
+        None => true,
+        Some(validators_subset) if validators_subset.contains(&idx) => true,
+        Some(_) => false,
+    };
+
     for (index, validator) in validator_statuses.statuses.iter().enumerate() {
         // Ignore ineligible validators. All sub-functions of the spec do this except for
         // `get_inclusion_delay_deltas`. It's safe to do so here because any validator that is in
@@ -99,41 +137,46 @@ pub fn get_attestation_deltas<T: EthSpec>(
 
         let base_reward = get_base_reward(state, index, total_balances.current_epoch(), spec)?;
 
-        let source_delta =
-            get_source_delta(validator, base_reward, total_balances, finality_delay, spec)?;
-        let target_delta =
-            get_target_delta(validator, base_reward, total_balances, finality_delay, spec)?;
-        let head_delta =
-            get_head_delta(validator, base_reward, total_balances, finality_delay, spec)?;
         let (inclusion_delay_delta, proposer_delta) =
             get_inclusion_delay_delta(validator, base_reward, spec)?;
-        let inactivity_penalty_delta =
-            get_inactivity_penalty_delta(validator, base_reward, finality_delay, spec)?;
 
-        let delta = deltas
-            .get_mut(index)
-            .ok_or(Error::DeltaOutOfBounds(index))?;
-        delta.source_delta.combine(source_delta)?;
-        delta.target_delta.combine(target_delta)?;
-        delta.head_delta.combine(head_delta)?;
-        delta.inclusion_delay_delta.combine(inclusion_delay_delta)?;
-        delta
-            .inactivity_penalty_delta
-            .combine(inactivity_penalty_delta)?;
+        if include_validator_delta(index) {
+            let source_delta =
+                get_source_delta(validator, base_reward, total_balances, finality_delay, spec)?;
+            let target_delta =
+                get_target_delta(validator, base_reward, total_balances, finality_delay, spec)?;
+            let head_delta =
+                get_head_delta(validator, base_reward, total_balances, finality_delay, spec)?;
+            let inactivity_penalty_delta =
+                get_inactivity_penalty_delta(validator, base_reward, finality_delay, spec)?;
+
+            let delta = deltas
+                .get_mut(index)
+                .ok_or(Error::DeltaOutOfBounds(index))?;
+            delta.source_delta.combine(source_delta)?;
+            delta.target_delta.combine(target_delta)?;
+            delta.head_delta.combine(head_delta)?;
+            delta.inclusion_delay_delta.combine(inclusion_delay_delta)?;
+            delta
+                .inactivity_penalty_delta
+                .combine(inactivity_penalty_delta)?;
+        }
 
         if let Some((proposer_index, proposer_delta)) = proposer_delta {
-            deltas
-                .get_mut(proposer_index)
-                .ok_or(Error::ValidatorStatusesInconsistent)?
-                .inclusion_delay_delta
-                .combine(proposer_delta)?;
+            if include_validator_delta(proposer_index) {
+                deltas
+                    .get_mut(proposer_index)
+                    .ok_or(Error::ValidatorStatusesInconsistent)?
+                    .inclusion_delay_delta
+                    .combine(proposer_delta)?;
+            }
         }
     }
 
     Ok(deltas)
 }
 
-fn get_attestation_component_delta(
+pub fn get_attestation_component_delta(
     index_in_unslashed_attesting_indices: bool,
     attesting_balance: u64,
     total_balances: &TotalBalances,
@@ -216,7 +259,7 @@ fn get_head_delta(
     )
 }
 
-fn get_inclusion_delay_delta(
+pub fn get_inclusion_delay_delta(
     validator: &ValidatorStatus,
     base_reward: u64,
     spec: &ChainSpec,
@@ -242,7 +285,7 @@ fn get_inclusion_delay_delta(
     }
 }
 
-fn get_inactivity_penalty_delta(
+pub fn get_inactivity_penalty_delta(
     validator: &ValidatorStatus,
     base_reward: u64,
     finality_delay: u64,
diff --git a/consensus/state_processing/src/per_slot_processing.rs b/consensus/state_processing/src/per_slot_processing.rs
index ead06edbf5..e16fb4a7b1 100644
--- a/consensus/state_processing/src/per_slot_processing.rs
+++ b/consensus/state_processing/src/per_slot_processing.rs
@@ -21,7 +21,7 @@ impl From<ArithError> for Error {
 ///
 /// If the root of the supplied `state` is known, then it can be passed as `state_root`. If
 /// `state_root` is `None`, the root of `state` will be computed using a cached tree hash.
-/// Providing the `state_root` makes this function several orders of magniude faster.
+/// Providing the `state_root` makes this function several orders of magnitude faster.
 pub fn per_slot_processing<T: EthSpec>(
     state: &mut BeaconState<T>,
     state_root: Option<Hash256>,
diff --git a/consensus/state_processing/src/verify_operation.rs b/consensus/state_processing/src/verify_operation.rs
index 864844080f..b3924cd973 100644
--- a/consensus/state_processing/src/verify_operation.rs
+++ b/consensus/state_processing/src/verify_operation.rs
@@ -138,7 +138,7 @@ impl<E: EthSpec> VerifyOperation<E> for SignedVoluntaryExit {
         Ok(SigVerifiedOp::new(self, state))
     }
 
-    #[allow(clippy::integer_arithmetic)]
+    #[allow(clippy::arithmetic_side_effects)]
     fn verification_epochs(&self) -> SmallVec<[Epoch; MAX_FORKS_VERIFIED_AGAINST]> {
         smallvec![self.message.epoch]
     }
@@ -156,7 +156,7 @@ impl<E: EthSpec> VerifyOperation<E> for AttesterSlashing<E> {
         Ok(SigVerifiedOp::new(self, state))
     }
 
-    #[allow(clippy::integer_arithmetic)]
+    #[allow(clippy::arithmetic_side_effects)]
     fn verification_epochs(&self) -> SmallVec<[Epoch; MAX_FORKS_VERIFIED_AGAINST]> {
         smallvec![
             self.attestation_1.data.target.epoch,
@@ -177,7 +177,7 @@ impl<E: EthSpec> VerifyOperation<E> for ProposerSlashing {
         Ok(SigVerifiedOp::new(self, state))
     }
 
-    #[allow(clippy::integer_arithmetic)]
+    #[allow(clippy::arithmetic_side_effects)]
     fn verification_epochs(&self) -> SmallVec<[Epoch; MAX_FORKS_VERIFIED_AGAINST]> {
         // Only need a single epoch because the slots of the two headers must be equal.
         smallvec![self
@@ -200,7 +200,7 @@ impl<E: EthSpec> VerifyOperation<E> for SignedBlsToExecutionChange {
         Ok(SigVerifiedOp::new(self, state))
     }
 
-    #[allow(clippy::integer_arithmetic)]
+    #[allow(clippy::arithmetic_side_effects)]
     fn verification_epochs(&self) -> SmallVec<[Epoch; MAX_FORKS_VERIFIED_AGAINST]> {
         smallvec![]
     }
diff --git a/consensus/types/Cargo.toml b/consensus/types/Cargo.toml
index ba15f6d488..f030f2e97a 100644
--- a/consensus/types/Cargo.toml
+++ b/consensus/types/Cargo.toml
@@ -60,6 +60,7 @@ beacon_chain = { path = "../../beacon_node/beacon_chain" }
 eth2_interop_keypairs = { path = "../../common/eth2_interop_keypairs" }
 state_processing = { path = "../state_processing" }
 tokio = "1.14.0"
+paste = "1.0.14"
 
 [features]
 default = ["sqlite", "legacy-arith"]
diff --git a/consensus/types/src/beacon_state.rs b/consensus/types/src/beacon_state.rs
index 1fa4dee3a0..6a205e307a 100644
--- a/consensus/types/src/beacon_state.rs
+++ b/consensus/types/src/beacon_state.rs
@@ -442,7 +442,7 @@ impl<T: EthSpec> BeaconState<T> {
     }
 
     /// Specialised deserialisation method that uses the `ChainSpec` as context.
-    #[allow(clippy::integer_arithmetic)]
+    #[allow(clippy::arithmetic_side_effects)]
     pub fn from_ssz_bytes(bytes: &[u8], spec: &ChainSpec) -> Result<Self, ssz::DecodeError> {
         // Slot is after genesis_time (u64) and genesis_validators_root (Hash256).
         let slot_start = <u64 as Decode>::ssz_fixed_len() + <Hash256 as Decode>::ssz_fixed_len();
@@ -1734,16 +1734,22 @@ impl<T: EthSpec> BeaconState<T> {
         previous_epoch: Epoch,
         val_index: usize,
     ) -> Result<bool, Error> {
-        self.get_validator(val_index).map(|val| {
-            val.is_active_at(previous_epoch)
-                || (val.slashed && previous_epoch + Epoch::new(1) < val.withdrawable_epoch)
-        })
+        let val = self.get_validator(val_index)?;
+        Ok(val.is_active_at(previous_epoch)
+            || (val.slashed && previous_epoch.safe_add(Epoch::new(1))? < val.withdrawable_epoch))
     }
 
     /// Passing `previous_epoch` to this function rather than computing it internally provides
     /// a tangible speed improvement in state processing.
-    pub fn is_in_inactivity_leak(&self, previous_epoch: Epoch, spec: &ChainSpec) -> bool {
-        (previous_epoch - self.finalized_checkpoint().epoch) > spec.min_epochs_to_inactivity_penalty
+    pub fn is_in_inactivity_leak(
+        &self,
+        previous_epoch: Epoch,
+        spec: &ChainSpec,
+    ) -> Result<bool, safe_arith::ArithError> {
+        Ok(
+            (previous_epoch.safe_sub(self.finalized_checkpoint().epoch)?)
+                > spec.min_epochs_to_inactivity_penalty,
+        )
     }
 
     /// Get the `SyncCommittee` associated with the next slot. Useful because sync committees
diff --git a/consensus/types/src/beacon_state/committee_cache.rs b/consensus/types/src/beacon_state/committee_cache.rs
index 8afef1183b..64bf686f34 100644
--- a/consensus/types/src/beacon_state/committee_cache.rs
+++ b/consensus/types/src/beacon_state/committee_cache.rs
@@ -1,4 +1,4 @@
-#![allow(clippy::integer_arithmetic)]
+#![allow(clippy::arithmetic_side_effects)]
 
 use super::BeaconState;
 use crate::*;
@@ -56,6 +56,11 @@ impl CommitteeCache {
             return Err(Error::ZeroSlotsPerEpoch);
         }
 
+        // The use of `NonZeroUsize` reduces the maximum number of possible validators by one.
+        if state.validators().len() == usize::max_value() {
+            return Err(Error::TooManyValidators);
+        }
+
         let active_validator_indices = get_active_validator_indices(state.validators(), epoch);
 
         if active_validator_indices.is_empty() {
@@ -75,11 +80,6 @@ impl CommitteeCache {
         )
         .ok_or(Error::UnableToShuffle)?;
 
-        // The use of `NonZeroUsize` reduces the maximum number of possible validators by one.
-        if state.validators().len() == usize::max_value() {
-            return Err(Error::TooManyValidators);
-        }
-
         let mut shuffling_positions = vec![<_>::default(); state.validators().len()];
         for (i, &v) in shuffling.iter().enumerate() {
             *shuffling_positions
@@ -174,7 +174,7 @@ impl CommitteeCache {
             .ok_or(Error::CommitteeCacheUninitialized(None))?;
 
         initialized_epoch.slot_iter(self.slots_per_epoch).try_fold(
-            Vec::with_capacity(self.slots_per_epoch as usize),
+            Vec::with_capacity(self.epoch_committee_count()),
             |mut vec, slot| {
                 vec.append(&mut self.get_beacon_committees_at_slot(slot)?);
                 Ok(vec)
diff --git a/consensus/types/src/beacon_state/tree_hash_cache.rs b/consensus/types/src/beacon_state/tree_hash_cache.rs
index d1d63e3c80..69cd6fbb87 100644
--- a/consensus/types/src/beacon_state/tree_hash_cache.rs
+++ b/consensus/types/src/beacon_state/tree_hash_cache.rs
@@ -1,4 +1,4 @@
-#![allow(clippy::integer_arithmetic)]
+#![allow(clippy::arithmetic_side_effects)]
 #![allow(clippy::disallowed_methods)]
 #![allow(clippy::indexing_slicing)]
 
diff --git a/consensus/types/src/chain_spec.rs b/consensus/types/src/chain_spec.rs
index 5957182230..a13d3116d8 100644
--- a/consensus/types/src/chain_spec.rs
+++ b/consensus/types/src/chain_spec.rs
@@ -6,6 +6,7 @@ use serde_derive::Deserialize;
 use serde_utils::quoted_u64::MaybeQuoted;
 use std::fs::File;
 use std::path::Path;
+use std::time::Duration;
 use tree_hash::TreeHash;
 
 /// Each of the BLS signature domains.
@@ -170,7 +171,15 @@ pub struct ChainSpec {
     pub attestation_subnet_count: u64,
     pub subnets_per_node: u8,
     pub epochs_per_subnet_subscription: u64,
+    pub gossip_max_size: u64,
+    pub min_epochs_for_block_requests: u64,
+    pub max_chunk_size: u64,
+    pub ttfb_timeout: u64,
+    pub resp_timeout: u64,
+    pub message_domain_invalid_snappy: [u8; 4],
+    pub message_domain_valid_snappy: [u8; 4],
     pub attestation_subnet_extra_bits: u8,
+    pub attestation_subnet_prefix_bits: u8,
 
     /*
      * Application params
@@ -451,10 +460,16 @@ impl ChainSpec {
         Hash256::from(domain)
     }
 
-    #[allow(clippy::integer_arithmetic)]
-    pub const fn attestation_subnet_prefix_bits(&self) -> u32 {
-        let attestation_subnet_count_bits = self.attestation_subnet_count.ilog2();
-        self.attestation_subnet_extra_bits as u32 + attestation_subnet_count_bits
+    pub fn maximum_gossip_clock_disparity(&self) -> Duration {
+        Duration::from_millis(self.maximum_gossip_clock_disparity_millis)
+    }
+
+    pub fn ttfb_timeout(&self) -> Duration {
+        Duration::from_secs(self.ttfb_timeout)
+    }
+
+    pub fn resp_timeout(&self) -> Duration {
+        Duration::from_secs(self.resp_timeout)
     }
 
     /// Returns a `ChainSpec` compatible with the Ethereum Foundation specification.
@@ -617,8 +632,15 @@ impl ChainSpec {
             maximum_gossip_clock_disparity_millis: 500,
             target_aggregators_per_committee: 16,
             epochs_per_subnet_subscription: 256,
-            attestation_subnet_extra_bits: 0,
-
+            gossip_max_size: default_gossip_max_size(),
+            min_epochs_for_block_requests: default_min_epochs_for_block_requests(),
+            max_chunk_size: default_max_chunk_size(),
+            ttfb_timeout: default_ttfb_timeout(),
+            resp_timeout: default_resp_timeout(),
+            message_domain_invalid_snappy: default_message_domain_invalid_snappy(),
+            message_domain_valid_snappy: default_message_domain_valid_snappy(),
+            attestation_subnet_extra_bits: default_attestation_subnet_extra_bits(),
+            attestation_subnet_prefix_bits: default_attestation_subnet_prefix_bits(),
             /*
              * Application specific
              */
@@ -842,7 +864,15 @@ impl ChainSpec {
             maximum_gossip_clock_disparity_millis: 500,
             target_aggregators_per_committee: 16,
             epochs_per_subnet_subscription: 256,
-            attestation_subnet_extra_bits: 0,
+            gossip_max_size: default_gossip_max_size(),
+            min_epochs_for_block_requests: default_min_epochs_for_block_requests(),
+            max_chunk_size: default_max_chunk_size(),
+            ttfb_timeout: default_ttfb_timeout(),
+            resp_timeout: default_resp_timeout(),
+            message_domain_invalid_snappy: default_message_domain_invalid_snappy(),
+            message_domain_valid_snappy: default_message_domain_valid_snappy(),
+            attestation_subnet_extra_bits: default_attestation_subnet_extra_bits(),
+            attestation_subnet_prefix_bits: default_attestation_subnet_prefix_bits(),
 
             /*
              * Application specific
@@ -953,6 +983,34 @@ pub struct Config {
     #[serde(with = "serde_utils::quoted_u64")]
     deposit_network_id: u64,
     deposit_contract_address: Address,
+
+    #[serde(default = "default_gossip_max_size")]
+    #[serde(with = "serde_utils::quoted_u64")]
+    gossip_max_size: u64,
+    #[serde(default = "default_min_epochs_for_block_requests")]
+    #[serde(with = "serde_utils::quoted_u64")]
+    min_epochs_for_block_requests: u64,
+    #[serde(default = "default_max_chunk_size")]
+    #[serde(with = "serde_utils::quoted_u64")]
+    max_chunk_size: u64,
+    #[serde(default = "default_ttfb_timeout")]
+    #[serde(with = "serde_utils::quoted_u64")]
+    ttfb_timeout: u64,
+    #[serde(default = "default_resp_timeout")]
+    #[serde(with = "serde_utils::quoted_u64")]
+    resp_timeout: u64,
+    #[serde(default = "default_message_domain_invalid_snappy")]
+    #[serde(with = "serde_utils::bytes_4_hex")]
+    message_domain_invalid_snappy: [u8; 4],
+    #[serde(default = "default_message_domain_valid_snappy")]
+    #[serde(with = "serde_utils::bytes_4_hex")]
+    message_domain_valid_snappy: [u8; 4],
+    #[serde(default = "default_attestation_subnet_extra_bits")]
+    #[serde(with = "serde_utils::quoted_u8")]
+    attestation_subnet_extra_bits: u8,
+    #[serde(default = "default_attestation_subnet_prefix_bits")]
+    #[serde(with = "serde_utils::quoted_u8")]
+    attestation_subnet_prefix_bits: u8,
 }
 
 fn default_bellatrix_fork_version() -> [u8; 4] {
@@ -993,6 +1051,42 @@ fn default_subnets_per_node() -> u8 {
     2u8
 }
 
+const fn default_gossip_max_size() -> u64 {
+    10485760
+}
+
+const fn default_min_epochs_for_block_requests() -> u64 {
+    33024
+}
+
+const fn default_max_chunk_size() -> u64 {
+    10485760
+}
+
+const fn default_ttfb_timeout() -> u64 {
+    5
+}
+
+const fn default_resp_timeout() -> u64 {
+    10
+}
+
+const fn default_message_domain_invalid_snappy() -> [u8; 4] {
+    [0, 0, 0, 0]
+}
+
+const fn default_message_domain_valid_snappy() -> [u8; 4] {
+    [1, 0, 0, 0]
+}
+
+const fn default_attestation_subnet_extra_bits() -> u8 {
+    0
+}
+
+const fn default_attestation_subnet_prefix_bits() -> u8 {
+    6
+}
+
 impl Default for Config {
     fn default() -> Self {
         let chain_spec = MainnetEthSpec::default_spec();
@@ -1088,6 +1182,16 @@ impl Config {
             deposit_chain_id: spec.deposit_chain_id,
             deposit_network_id: spec.deposit_network_id,
             deposit_contract_address: spec.deposit_contract_address,
+
+            gossip_max_size: spec.gossip_max_size,
+            min_epochs_for_block_requests: spec.min_epochs_for_block_requests,
+            max_chunk_size: spec.max_chunk_size,
+            ttfb_timeout: spec.ttfb_timeout,
+            resp_timeout: spec.resp_timeout,
+            message_domain_invalid_snappy: spec.message_domain_invalid_snappy,
+            message_domain_valid_snappy: spec.message_domain_valid_snappy,
+            attestation_subnet_extra_bits: spec.attestation_subnet_extra_bits,
+            attestation_subnet_prefix_bits: spec.attestation_subnet_prefix_bits,
         }
     }
 
@@ -1132,6 +1236,15 @@ impl Config {
             deposit_chain_id,
             deposit_network_id,
             deposit_contract_address,
+            gossip_max_size,
+            min_epochs_for_block_requests,
+            max_chunk_size,
+            ttfb_timeout,
+            resp_timeout,
+            message_domain_invalid_snappy,
+            message_domain_valid_snappy,
+            attestation_subnet_extra_bits,
+            attestation_subnet_prefix_bits,
         } = self;
 
         if preset_base != T::spec_name().to_string().as_str() {
@@ -1169,6 +1282,15 @@ impl Config {
             terminal_block_hash,
             terminal_block_hash_activation_epoch,
             safe_slots_to_import_optimistically,
+            gossip_max_size,
+            min_epochs_for_block_requests,
+            max_chunk_size,
+            ttfb_timeout,
+            resp_timeout,
+            message_domain_invalid_snappy,
+            message_domain_valid_snappy,
+            attestation_subnet_extra_bits,
+            attestation_subnet_prefix_bits,
             ..chain_spec.clone()
         })
     }
@@ -1306,6 +1428,7 @@ mod tests {
 #[cfg(test)]
 mod yaml_tests {
     use super::*;
+    use paste::paste;
     use tempfile::NamedTempFile;
 
     #[test]
@@ -1410,29 +1533,35 @@ mod yaml_tests {
         "#;
 
         let chain_spec: Config = serde_yaml::from_str(spec).unwrap();
-        assert_eq!(
-            chain_spec.terminal_total_difficulty,
-            default_terminal_total_difficulty()
-        );
-        assert_eq!(
-            chain_spec.terminal_block_hash,
-            default_terminal_block_hash()
-        );
-        assert_eq!(
-            chain_spec.terminal_block_hash_activation_epoch,
-            default_terminal_block_hash_activation_epoch()
-        );
-        assert_eq!(
-            chain_spec.safe_slots_to_import_optimistically,
-            default_safe_slots_to_import_optimistically()
-        );
+
+        // Asserts that `chain_spec.$name` and `default_$name()` are equal.
+        macro_rules! check_default {
+            ($name: ident) => {
+                paste! {
+                    assert_eq!(
+                        chain_spec.$name,
+                        [<default_ $name>](),
+                        "{} does not match default", stringify!($name));
+                }
+            };
+        }
+
+        check_default!(terminal_total_difficulty);
+        check_default!(terminal_block_hash);
+        check_default!(terminal_block_hash_activation_epoch);
+        check_default!(safe_slots_to_import_optimistically);
+        check_default!(bellatrix_fork_version);
+        check_default!(gossip_max_size);
+        check_default!(min_epochs_for_block_requests);
+        check_default!(max_chunk_size);
+        check_default!(ttfb_timeout);
+        check_default!(resp_timeout);
+        check_default!(message_domain_invalid_snappy);
+        check_default!(message_domain_valid_snappy);
+        check_default!(attestation_subnet_extra_bits);
+        check_default!(attestation_subnet_prefix_bits);
 
         assert_eq!(chain_spec.bellatrix_fork_epoch, None);
-
-        assert_eq!(
-            chain_spec.bellatrix_fork_version,
-            default_bellatrix_fork_version()
-        );
     }
 
     #[test]
diff --git a/consensus/types/src/execution_payload.rs b/consensus/types/src/execution_payload.rs
index 77ef6407e8..690138da67 100644
--- a/consensus/types/src/execution_payload.rs
+++ b/consensus/types/src/execution_payload.rs
@@ -106,7 +106,7 @@ impl<T: EthSpec> ExecutionPayload<T> {
         }
     }
 
-    #[allow(clippy::integer_arithmetic)]
+    #[allow(clippy::arithmetic_side_effects)]
     /// Returns the maximum size of an execution payload.
     pub fn max_execution_payload_merge_size() -> usize {
         // Fixed part
@@ -117,7 +117,7 @@ impl<T: EthSpec> ExecutionPayload<T> {
             + (T::max_transactions_per_payload() * (ssz::BYTES_PER_LENGTH_OFFSET + T::max_bytes_per_transaction()))
     }
 
-    #[allow(clippy::integer_arithmetic)]
+    #[allow(clippy::arithmetic_side_effects)]
     /// Returns the maximum size of an execution payload.
     pub fn max_execution_payload_capella_size() -> usize {
         // Fixed part
diff --git a/consensus/types/src/lib.rs b/consensus/types/src/lib.rs
index aefb45490a..85ce351766 100644
--- a/consensus/types/src/lib.rs
+++ b/consensus/types/src/lib.rs
@@ -3,7 +3,7 @@
 #![cfg_attr(
     not(test),
     deny(
-        clippy::integer_arithmetic,
+        clippy::arithmetic_side_effects,
         clippy::disallowed_methods,
         clippy::indexing_slicing
     )
@@ -71,6 +71,7 @@ pub mod sync_duty;
 pub mod validator;
 pub mod validator_subscription;
 pub mod voluntary_exit;
+pub mod withdrawal_credentials;
 #[macro_use]
 pub mod slot_epoch_macros;
 pub mod config_and_preset;
@@ -189,6 +190,7 @@ pub use crate::validator_registration_data::*;
 pub use crate::validator_subscription::ValidatorSubscription;
 pub use crate::voluntary_exit::VoluntaryExit;
 pub use crate::withdrawal::Withdrawal;
+pub use crate::withdrawal_credentials::WithdrawalCredentials;
 
 pub type CommitteeIndex = u64;
 pub type Hash256 = H256;
diff --git a/consensus/types/src/participation_list.rs b/consensus/types/src/participation_list.rs
index 89a56cb87d..be119fbef2 100644
--- a/consensus/types/src/participation_list.rs
+++ b/consensus/types/src/participation_list.rs
@@ -1,4 +1,4 @@
-#![allow(clippy::integer_arithmetic)]
+#![allow(clippy::arithmetic_side_effects)]
 
 use crate::{Hash256, ParticipationFlags, Unsigned, VariableList};
 use cached_tree_hash::{int_log, CacheArena, CachedTreeHash, Error, TreeHashCache};
diff --git a/consensus/types/src/subnet_id.rs b/consensus/types/src/subnet_id.rs
index 6793fe5574..415d6a1404 100644
--- a/consensus/types/src/subnet_id.rs
+++ b/consensus/types/src/subnet_id.rs
@@ -72,7 +72,7 @@ impl SubnetId {
             .into())
     }
 
-    #[allow(clippy::integer_arithmetic)]
+    #[allow(clippy::arithmetic_side_effects)]
     /// Computes the set of subnets the node should be subscribed to during the current epoch,
     /// along with the first epoch in which these subscriptions are no longer valid.
     pub fn compute_subnets_for_epoch<T: EthSpec>(
@@ -84,7 +84,7 @@ impl SubnetId {
         let subscription_duration = spec.epochs_per_subnet_subscription;
 
         let node_id_prefix =
-            (node_id >> (256 - spec.attestation_subnet_prefix_bits() as usize)).as_usize();
+            (node_id >> (256 - spec.attestation_subnet_prefix_bits as usize)).as_usize();
 
         // NOTE: The as_u64() panics if the number is larger than u64::max_value(). This cannot be
         // true as spec.epochs_per_subnet_subscription is a u64.
@@ -99,7 +99,7 @@ impl SubnetId {
         let permutation_seed =
             ethereum_hashing::hash(&int_to_bytes::int_to_bytes8(subscription_event_idx));
 
-        let num_subnets = 1 << spec.attestation_subnet_prefix_bits();
+        let num_subnets = 1 << spec.attestation_subnet_prefix_bits;
         let permutated_prefix = compute_shuffled_index(
             node_id_prefix,
             num_subnets,
diff --git a/consensus/types/src/test_utils/mod.rs b/consensus/types/src/test_utils/mod.rs
index c0333bcfd6..d172342ee6 100644
--- a/consensus/types/src/test_utils/mod.rs
+++ b/consensus/types/src/test_utils/mod.rs
@@ -1,4 +1,4 @@
-#![allow(clippy::integer_arithmetic)]
+#![allow(clippy::arithmetic_side_effects)]
 
 use std::fmt::Debug;
 
diff --git a/consensus/types/src/test_utils/test_random.rs b/consensus/types/src/test_utils/test_random.rs
index 43396dedc0..51b79d8d53 100644
--- a/consensus/types/src/test_utils/test_random.rs
+++ b/consensus/types/src/test_utils/test_random.rs
@@ -28,7 +28,7 @@ pub trait TestRandom {
 
 impl<T> TestRandom for PhantomData<T> {
     fn random_for_test(_rng: &mut impl RngCore) -> Self {
-        PhantomData::default()
+        PhantomData
     }
 }
 
diff --git a/consensus/types/src/withdrawal_credentials.rs b/consensus/types/src/withdrawal_credentials.rs
new file mode 100644
index 0000000000..8d42d4eafd
--- /dev/null
+++ b/consensus/types/src/withdrawal_credentials.rs
@@ -0,0 +1,57 @@
+use crate::*;
+use bls::get_withdrawal_credentials;
+
+pub struct WithdrawalCredentials(Hash256);
+
+impl WithdrawalCredentials {
+    pub fn bls(withdrawal_public_key: &PublicKey, spec: &ChainSpec) -> Self {
+        let withdrawal_credentials =
+            get_withdrawal_credentials(withdrawal_public_key, spec.bls_withdrawal_prefix_byte);
+        Self(Hash256::from_slice(&withdrawal_credentials))
+    }
+
+    pub fn eth1(withdrawal_address: Address, spec: &ChainSpec) -> Self {
+        let mut withdrawal_credentials = [0; 32];
+        withdrawal_credentials[0] = spec.eth1_address_withdrawal_prefix_byte;
+        withdrawal_credentials[12..].copy_from_slice(withdrawal_address.as_bytes());
+        Self(Hash256::from_slice(&withdrawal_credentials))
+    }
+}
+
+impl From<WithdrawalCredentials> for Hash256 {
+    fn from(withdrawal_credentials: WithdrawalCredentials) -> Self {
+        withdrawal_credentials.0
+    }
+}
+
+#[cfg(test)]
+mod test {
+    use super::*;
+    use crate::test_utils::generate_deterministic_keypair;
+    use std::str::FromStr;
+
+    #[test]
+    fn bls_withdrawal_credentials() {
+        let spec = &MainnetEthSpec::default_spec();
+        let keypair = generate_deterministic_keypair(0);
+        let credentials = WithdrawalCredentials::bls(&keypair.pk, spec);
+        let manually_generated_credentials =
+            get_withdrawal_credentials(&keypair.pk, spec.bls_withdrawal_prefix_byte);
+        let hash: Hash256 = credentials.into();
+        assert_eq!(hash[0], spec.bls_withdrawal_prefix_byte);
+        assert_eq!(hash.as_bytes(), &manually_generated_credentials);
+    }
+
+    #[test]
+    fn eth1_withdrawal_credentials() {
+        let spec = &MainnetEthSpec::default_spec();
+        let address = Address::from_str("0x25c4a76E7d118705e7Ea2e9b7d8C59930d8aCD3b").unwrap();
+        let credentials = WithdrawalCredentials::eth1(address, spec);
+        let hash: Hash256 = credentials.into();
+        assert_eq!(
+            hash,
+            Hash256::from_str("0x01000000000000000000000025c4a76E7d118705e7Ea2e9b7d8C59930d8aCD3b")
+                .unwrap()
+        )
+    }
+}
diff --git a/crypto/bls/src/generic_public_key_bytes.rs b/crypto/bls/src/generic_public_key_bytes.rs
index 59b0ffc43f..240568b4f6 100644
--- a/crypto/bls/src/generic_public_key_bytes.rs
+++ b/crypto/bls/src/generic_public_key_bytes.rs
@@ -27,10 +27,7 @@ impl<Pub> Copy for GenericPublicKeyBytes<Pub> {}
 
 impl<Pub> Clone for GenericPublicKeyBytes<Pub> {
     fn clone(&self) -> Self {
-        Self {
-            bytes: self.bytes,
-            _phantom: PhantomData,
-        }
+        *self
     }
 }
 
diff --git a/lcli/Cargo.toml b/lcli/Cargo.toml
index f9d0a6a31c..704e0a657e 100644
--- a/lcli/Cargo.toml
+++ b/lcli/Cargo.toml
@@ -1,7 +1,7 @@
 [package]
 name = "lcli"
 description = "Lighthouse CLI (modeled after zcli)"
-version = "4.3.0"
+version = "4.4.1"
 authors = ["Paul Hauner <paul@paulhauner.com>"]
 edition = "2021"
 
diff --git a/lcli/Dockerfile b/lcli/Dockerfile
index 98f33f2153..a50aa17027 100644
--- a/lcli/Dockerfile
+++ b/lcli/Dockerfile
@@ -2,7 +2,7 @@
 #  - from the `lighthouse` dir with the command: `docker build -f ./lcli/Dockerflie .`
 #  - from the current directory with the command: `docker build -f ./Dockerfile ../`
 FROM rust:1.68.2-bullseye AS builder
-RUN apt-get update && apt-get -y upgrade && apt-get install -y cmake libclang-dev protobuf-compiler
+RUN apt-get update && apt-get -y upgrade && apt-get install -y cmake libclang-dev
 COPY . lighthouse
 ARG PORTABLE
 ENV PORTABLE $PORTABLE
@@ -10,4 +10,4 @@ RUN cd lighthouse && make install-lcli
 
 FROM ubuntu:22.04
 RUN apt-get update && apt-get -y upgrade && apt-get clean && rm -rf /var/lib/apt/lists/*
-COPY --from=builder /usr/local/cargo/bin/lcli /usr/local/bin/lcli
+COPY --from=builder /usr/local/cargo/bin/lcli /usr/local/bin/lcli
\ No newline at end of file
diff --git a/lcli/src/block_root.rs b/lcli/src/block_root.rs
index a47b48a30a..a4237d855b 100644
--- a/lcli/src/block_root.rs
+++ b/lcli/src/block_root.rs
@@ -31,14 +31,19 @@ use clap::ArgMatches;
 use clap_utils::{parse_optional, parse_required};
 use environment::Environment;
 use eth2::{types::BlockId, BeaconNodeHttpClient, SensitiveUrl, Timeouts};
+use eth2_network_config::Eth2NetworkConfig;
 use std::path::PathBuf;
 use std::time::{Duration, Instant};
 use types::{EthSpec, FullPayload, SignedBeaconBlock};
 
 const HTTP_TIMEOUT: Duration = Duration::from_secs(5);
 
-pub fn run<T: EthSpec>(env: Environment<T>, matches: &ArgMatches) -> Result<(), String> {
-    let spec = &T::default_spec();
+pub fn run<T: EthSpec>(
+    env: Environment<T>,
+    network_config: Eth2NetworkConfig,
+    matches: &ArgMatches,
+) -> Result<(), String> {
+    let spec = &network_config.chain_spec::<T>()?;
     let executor = env.core_context().executor;
 
     /*
diff --git a/lcli/src/eth1_genesis.rs b/lcli/src/eth1_genesis.rs
index 34144cd86d..bddd4baad8 100644
--- a/lcli/src/eth1_genesis.rs
+++ b/lcli/src/eth1_genesis.rs
@@ -49,7 +49,7 @@ pub fn run<T: EthSpec>(
             .wait_for_genesis_state::<T>(ETH1_GENESIS_UPDATE_INTERVAL, spec)
             .await
             .map(move |genesis_state| {
-                eth2_network_config.genesis_state_bytes = Some(genesis_state.as_ssz_bytes());
+                eth2_network_config.genesis_state_bytes = Some(genesis_state.as_ssz_bytes().into());
                 eth2_network_config.force_write_to_file(testnet_dir)
             })
             .map_err(|e| format!("Failed to find genesis: {}", e))?;
diff --git a/lcli/src/generate_bootnode_enr.rs b/lcli/src/generate_bootnode_enr.rs
index 8662a80476..0584cd6549 100644
--- a/lcli/src/generate_bootnode_enr.rs
+++ b/lcli/src/generate_bootnode_enr.rs
@@ -1,6 +1,7 @@
 use clap::ArgMatches;
 use lighthouse_network::{
-    discovery::{build_enr, CombinedKey, CombinedKeyExt, Keypair, ENR_FILENAME},
+    discovery::{build_enr, CombinedKey, CombinedKeyExt, ENR_FILENAME},
+    libp2p::identity::secp256k1,
     NetworkConfig, NETWORK_KEY_FILENAME,
 };
 use std::fs::File;
@@ -29,8 +30,8 @@ pub fn run<T: EthSpec>(matches: &ArgMatches) -> Result<(), String> {
     config.enr_udp4_port = Some(udp_port);
     config.enr_tcp6_port = Some(tcp_port);
 
-    let local_keypair = Keypair::generate_secp256k1();
-    let enr_key = CombinedKey::from_libp2p(&local_keypair)?;
+    let secp256k1_keypair = secp256k1::Keypair::generate();
+    let enr_key = CombinedKey::from_secp256k1(&secp256k1_keypair);
     let enr_fork_id = EnrForkId {
         fork_digest: ChainSpec::compute_fork_digest(genesis_fork_version, Hash256::zero()),
         next_fork_version: genesis_fork_version,
@@ -47,13 +48,10 @@ pub fn run<T: EthSpec>(matches: &ArgMatches) -> Result<(), String> {
         .write_all(enr.to_base64().as_bytes())
         .map_err(|e| format!("Unable to write ENR to {}: {:?}", ENR_FILENAME, e))?;
 
-    let secret_bytes = match local_keypair {
-        Keypair::Secp256k1(key) => key.secret().to_bytes(),
-        _ => return Err("Key is not a secp256k1 key".into()),
-    };
-
     let mut key_file = File::create(output_dir.join(NETWORK_KEY_FILENAME))
         .map_err(|e| format!("Unable to create {}: {:?}", NETWORK_KEY_FILENAME, e))?;
+
+    let secret_bytes = secp256k1_keypair.secret().to_bytes();
     key_file
         .write_all(&secret_bytes)
         .map_err(|e| format!("Unable to write key to {}: {:?}", NETWORK_KEY_FILENAME, e))?;
diff --git a/lcli/src/interop_genesis.rs b/lcli/src/interop_genesis.rs
index 57a5ba0098..1a0b81fcb7 100644
--- a/lcli/src/interop_genesis.rs
+++ b/lcli/src/interop_genesis.rs
@@ -42,7 +42,7 @@ pub fn run<T: EthSpec>(testnet_dir: PathBuf, matches: &ArgMatches) -> Result<(),
         &spec,
     )?;
 
-    eth2_network_config.genesis_state_bytes = Some(genesis_state.as_ssz_bytes());
+    eth2_network_config.genesis_state_bytes = Some(genesis_state.as_ssz_bytes().into());
     eth2_network_config.force_write_to_file(testnet_dir)?;
 
     Ok(())
diff --git a/lcli/src/main.rs b/lcli/src/main.rs
index d072beaa4e..38fec2ebb4 100644
--- a/lcli/src/main.rs
+++ b/lcli/src/main.rs
@@ -15,11 +15,13 @@ mod new_testnet;
 mod parse_ssz;
 mod replace_state_pubkeys;
 mod skip_slots;
+mod state_root;
 mod transition_blocks;
 
 use clap::{App, Arg, ArgMatches, SubCommand};
-use clap_utils::parse_path_with_default_in_home_dir;
+use clap_utils::parse_optional;
 use environment::{EnvironmentBuilder, LoggerConfig};
+use eth2_network_config::Eth2NetworkConfig;
 use parse_ssz::run_parse_ssz;
 use std::path::PathBuf;
 use std::process;
@@ -38,7 +40,6 @@ fn main() {
                 .long("spec")
                 .value_name("STRING")
                 .takes_value(true)
-                .required(true)
                 .possible_values(&["minimal", "mainnet", "gnosis"])
                 .default_value("mainnet")
                 .global(true),
@@ -50,7 +51,16 @@ fn main() {
                 .value_name("PATH")
                 .takes_value(true)
                 .global(true)
-                .help("The testnet dir. Defaults to ~/.lighthouse/testnet"),
+                .help("The testnet dir."),
+        )
+        .arg(
+            Arg::with_name("network")
+                .long("network")
+                .value_name("NAME")
+                .takes_value(true)
+                .global(true)
+                .help("The network to use. Defaults to mainnet.")
+                .conflicts_with("testnet-dir")
         )
         .subcommand(
             SubCommand::with_name("skip-slots")
@@ -126,7 +136,7 @@ fn main() {
                         .takes_value(true)
                         .conflicts_with("beacon-url")
                         .requires("block-path")
-                        .help("Path to load a BeaconState from file as SSZ."),
+                        .help("Path to load a BeaconState from as SSZ."),
                 )
                 .arg(
                     Arg::with_name("block-path")
@@ -135,7 +145,7 @@ fn main() {
                         .takes_value(true)
                         .conflicts_with("beacon-url")
                         .requires("pre-state-path")
-                        .help("Path to load a SignedBeaconBlock from file as SSZ."),
+                        .help("Path to load a SignedBeaconBlock from as SSZ."),
                 )
                 .arg(
                     Arg::with_name("post-state-output-path")
@@ -361,7 +371,6 @@ fn main() {
                         .index(2)
                         .value_name("BIP39_MNENMONIC")
                         .takes_value(true)
-                        .required(true)
                         .default_value(
                             "replace nephew blur decorate waste convince soup column \
                             orient excite play baby",
@@ -382,7 +391,6 @@ fn main() {
                         .help("The block hash used when generating an execution payload. This \
                             value is used for `execution_payload_header.block_hash` as well as \
                             `execution_payload_header.random`")
-                        .required(true)
                         .default_value(
                             "0x0000000000000000000000000000000000000000000000000000000000000000",
                         ),
@@ -400,7 +408,6 @@ fn main() {
                         .value_name("INTEGER")
                         .takes_value(true)
                         .help("The base fee per gas field in the execution payload generated.")
-                        .required(true)
                         .default_value("1000000000"),
                 )
                 .arg(
@@ -409,7 +416,6 @@ fn main() {
                         .value_name("INTEGER")
                         .takes_value(true)
                         .help("The gas limit field in the execution payload generated.")
-                        .required(true)
                         .default_value("30000000"),
                 )
                 .arg(
@@ -808,14 +814,14 @@ fn main() {
         )
         .subcommand(
             SubCommand::with_name("block-root")
-                .about("Computes the block root of some block")
+                .about("Computes the block root of some block.")
                 .arg(
                     Arg::with_name("block-path")
                         .long("block-path")
                         .value_name("PATH")
                         .takes_value(true)
                         .conflicts_with("beacon-url")
-                        .help("Path to load a SignedBeaconBlock from file as SSZ."),
+                        .help("Path to load a SignedBeaconBlock from as SSZ."),
                 )
                 .arg(
                     Arg::with_name("beacon-url")
@@ -841,6 +847,41 @@ fn main() {
                         .help("Number of repeat runs, useful for benchmarking."),
                 )
         )
+        .subcommand(
+            SubCommand::with_name("state-root")
+                .about("Computes the state root of some state.")
+                .arg(
+                    Arg::with_name("state-path")
+                        .long("state-path")
+                        .value_name("PATH")
+                        .takes_value(true)
+                        .conflicts_with("beacon-url")
+                        .help("Path to load a BeaconState from as SSZ."),
+                )
+                .arg(
+                    Arg::with_name("beacon-url")
+                        .long("beacon-url")
+                        .value_name("URL")
+                        .takes_value(true)
+                        .help("URL to a beacon-API provider."),
+                )
+                .arg(
+                    Arg::with_name("state-id")
+                        .long("state-id")
+                        .value_name("BLOCK_ID")
+                        .takes_value(true)
+                        .requires("beacon-url")
+                        .help("Identifier for a state as per beacon-API standards (slot, root, etc.)"),
+                )
+                .arg(
+                    Arg::with_name("runs")
+                        .long("runs")
+                        .value_name("INTEGER")
+                        .takes_value(true)
+                        .default_value("1")
+                        .help("Number of repeat runs, useful for benchmarking."),
+                )
+        )
         .get_matches();
 
     let result = matches
@@ -887,41 +928,81 @@ fn run<T: EthSpec>(
         .build()
         .map_err(|e| format!("should build env: {:?}", e))?;
 
-    let testnet_dir = parse_path_with_default_in_home_dir(
-        matches,
-        "testnet-dir",
-        PathBuf::from(directory::DEFAULT_ROOT_DIR).join("testnet"),
-    )?;
+    // Determine testnet-dir path or network name depending on CLI flags.
+    let (testnet_dir, network_name) =
+        if let Some(testnet_dir) = parse_optional::<PathBuf>(matches, "testnet-dir")? {
+            (Some(testnet_dir), None)
+        } else {
+            let network_name =
+                parse_optional(matches, "network")?.unwrap_or_else(|| "mainnet".to_string());
+            (None, Some(network_name))
+        };
+
+    // Lazily load either the testnet dir or the network config, as required.
+    // Some subcommands like new-testnet need the testnet dir but not the network config.
+    let get_testnet_dir = || testnet_dir.clone().ok_or("testnet-dir is required");
+    let get_network_config = || {
+        if let Some(testnet_dir) = &testnet_dir {
+            Eth2NetworkConfig::load(testnet_dir.clone()).map_err(|e| {
+                format!(
+                    "Unable to open testnet dir at {}: {}",
+                    testnet_dir.display(),
+                    e
+                )
+            })
+        } else {
+            let network_name = network_name.ok_or("no network name or testnet-dir provided")?;
+            Eth2NetworkConfig::constant(&network_name)?.ok_or("invalid network name".into())
+        }
+    };
 
     match matches.subcommand() {
-        ("transition-blocks", Some(matches)) => transition_blocks::run::<T>(env, matches)
-            .map_err(|e| format!("Failed to transition blocks: {}", e)),
+        ("transition-blocks", Some(matches)) => {
+            let network_config = get_network_config()?;
+            transition_blocks::run::<T>(env, network_config, matches)
+                .map_err(|e| format!("Failed to transition blocks: {}", e))
+        }
         ("skip-slots", Some(matches)) => {
-            skip_slots::run::<T>(env, matches).map_err(|e| format!("Failed to skip slots: {}", e))
+            let network_config = get_network_config()?;
+            skip_slots::run::<T>(env, network_config, matches)
+                .map_err(|e| format!("Failed to skip slots: {}", e))
         }
         ("pretty-ssz", Some(matches)) => {
-            run_parse_ssz::<T>(matches).map_err(|e| format!("Failed to pretty print hex: {}", e))
+            let network_config = get_network_config()?;
+            run_parse_ssz::<T>(network_config, matches)
+                .map_err(|e| format!("Failed to pretty print hex: {}", e))
         }
         ("deploy-deposit-contract", Some(matches)) => {
             deploy_deposit_contract::run::<T>(env, matches)
                 .map_err(|e| format!("Failed to run deploy-deposit-contract command: {}", e))
         }
-        ("eth1-genesis", Some(matches)) => eth1_genesis::run::<T>(env, testnet_dir, matches)
-            .map_err(|e| format!("Failed to run eth1-genesis command: {}", e)),
-        ("interop-genesis", Some(matches)) => interop_genesis::run::<T>(testnet_dir, matches)
-            .map_err(|e| format!("Failed to run interop-genesis command: {}", e)),
+        ("eth1-genesis", Some(matches)) => {
+            let testnet_dir = get_testnet_dir()?;
+            eth1_genesis::run::<T>(env, testnet_dir, matches)
+                .map_err(|e| format!("Failed to run eth1-genesis command: {}", e))
+        }
+        ("interop-genesis", Some(matches)) => {
+            let testnet_dir = get_testnet_dir()?;
+            interop_genesis::run::<T>(testnet_dir, matches)
+                .map_err(|e| format!("Failed to run interop-genesis command: {}", e))
+        }
         ("change-genesis-time", Some(matches)) => {
+            let testnet_dir = get_testnet_dir()?;
             change_genesis_time::run::<T>(testnet_dir, matches)
                 .map_err(|e| format!("Failed to run change-genesis-time command: {}", e))
         }
         ("create-payload-header", Some(matches)) => create_payload_header::run::<T>(matches)
             .map_err(|e| format!("Failed to run create-payload-header command: {}", e)),
         ("replace-state-pubkeys", Some(matches)) => {
+            let testnet_dir = get_testnet_dir()?;
             replace_state_pubkeys::run::<T>(testnet_dir, matches)
                 .map_err(|e| format!("Failed to run replace-state-pubkeys command: {}", e))
         }
-        ("new-testnet", Some(matches)) => new_testnet::run::<T>(testnet_dir, matches)
-            .map_err(|e| format!("Failed to run new_testnet command: {}", e)),
+        ("new-testnet", Some(matches)) => {
+            let testnet_dir = get_testnet_dir()?;
+            new_testnet::run::<T>(testnet_dir, matches)
+                .map_err(|e| format!("Failed to run new_testnet command: {}", e))
+        }
         ("check-deposit-data", Some(matches)) => check_deposit_data::run(matches)
             .map_err(|e| format!("Failed to run check-deposit-data command: {}", e)),
         ("generate-bootnode-enr", Some(matches)) => generate_bootnode_enr::run::<T>(matches)
@@ -932,8 +1013,16 @@ fn run<T: EthSpec>(
             .map_err(|e| format!("Failed to run mnemonic-validators command: {}", e)),
         ("indexed-attestations", Some(matches)) => indexed_attestations::run::<T>(matches)
             .map_err(|e| format!("Failed to run indexed-attestations command: {}", e)),
-        ("block-root", Some(matches)) => block_root::run::<T>(env, matches)
-            .map_err(|e| format!("Failed to run block-root command: {}", e)),
+        ("block-root", Some(matches)) => {
+            let network_config = get_network_config()?;
+            block_root::run::<T>(env, network_config, matches)
+                .map_err(|e| format!("Failed to run block-root command: {}", e))
+        }
+        ("state-root", Some(matches)) => {
+            let network_config = get_network_config()?;
+            state_root::run::<T>(env, network_config, matches)
+                .map_err(|e| format!("Failed to run state-root command: {}", e))
+        }
         (other, _) => Err(format!("Unknown subcommand {}. See --help.", other)),
     }
 }
diff --git a/lcli/src/new_testnet.rs b/lcli/src/new_testnet.rs
index 01a44cabef..973993f979 100644
--- a/lcli/src/new_testnet.rs
+++ b/lcli/src/new_testnet.rs
@@ -1,7 +1,7 @@
 use account_utils::eth2_keystore::keypair_from_secret;
 use clap::ArgMatches;
 use clap_utils::{parse_optional, parse_required, parse_ssz_optional};
-use eth2_network_config::Eth2NetworkConfig;
+use eth2_network_config::{Eth2NetworkConfig, GenesisStateSource};
 use eth2_wallet::bip39::Seed;
 use eth2_wallet::bip39::{Language, Mnemonic};
 use eth2_wallet::{recover_validator_secret_from_mnemonic, KeyType};
@@ -190,7 +190,8 @@ pub fn run<T: EthSpec>(testnet_dir_path: PathBuf, matches: &ArgMatches) -> Resul
     let testnet = Eth2NetworkConfig {
         deposit_contract_deploy_block,
         boot_enr: Some(vec![]),
-        genesis_state_bytes,
+        genesis_state_bytes: genesis_state_bytes.map(Into::into),
+        genesis_state_source: GenesisStateSource::IncludedBytes,
         config: Config::from_chain_spec::<T>(&spec),
     };
 
diff --git a/lcli/src/parse_ssz.rs b/lcli/src/parse_ssz.rs
index 5d988ee181..5c306f4fdc 100644
--- a/lcli/src/parse_ssz.rs
+++ b/lcli/src/parse_ssz.rs
@@ -1,5 +1,6 @@
 use clap::ArgMatches;
 use clap_utils::parse_required;
+use eth2_network_config::Eth2NetworkConfig;
 use serde::Serialize;
 use snap::raw::Decoder;
 use ssz::Decode;
@@ -26,7 +27,10 @@ impl FromStr for OutputFormat {
     }
 }
 
-pub fn run_parse_ssz<T: EthSpec>(matches: &ArgMatches) -> Result<(), String> {
+pub fn run_parse_ssz<T: EthSpec>(
+    network_config: Eth2NetworkConfig,
+    matches: &ArgMatches,
+) -> Result<(), String> {
     let type_str = matches.value_of("type").ok_or("No type supplied")?;
     let filename = matches.value_of("ssz-file").ok_or("No file supplied")?;
     let format = parse_required(matches, "format")?;
@@ -44,44 +48,79 @@ pub fn run_parse_ssz<T: EthSpec>(matches: &ArgMatches) -> Result<(), String> {
         bytes
     };
 
-    info!("Using {} spec", T::spec_name());
-    info!("Type: {:?}", type_str);
+    let spec = &network_config.chain_spec::<T>()?;
+    info!(
+        "Using {} network config ({} preset)",
+        spec.config_name.as_deref().unwrap_or("unknown"),
+        T::spec_name()
+    );
+    info!("Type: {type_str}");
 
+    // More fork-specific decoders may need to be added in future, but shouldn't be 100% necessary,
+    // as the fork-generic decoder will always be available (requires correct --network flag).
     match type_str {
-        "signed_block_base" => decode_and_print::<SignedBeaconBlockBase<T>>(&bytes, format)?,
-        "signed_block_altair" => decode_and_print::<SignedBeaconBlockAltair<T>>(&bytes, format)?,
-        "signed_block_merge" => decode_and_print::<SignedBeaconBlockMerge<T>>(&bytes, format)?,
-        "block_base" => decode_and_print::<BeaconBlockBase<T>>(&bytes, format)?,
-        "block_altair" => decode_and_print::<BeaconBlockAltair<T>>(&bytes, format)?,
-        "block_merge" => decode_and_print::<BeaconBlockMerge<T>>(&bytes, format)?,
-        "state_base" => decode_and_print::<BeaconStateBase<T>>(&bytes, format)?,
-        "state_altair" => decode_and_print::<BeaconStateAltair<T>>(&bytes, format)?,
-        "state_merge" => decode_and_print::<BeaconStateMerge<T>>(&bytes, format)?,
+        "SignedBeaconBlock" => decode_and_print::<SignedBeaconBlock<T>>(
+            &bytes,
+            |bytes| SignedBeaconBlock::from_ssz_bytes(bytes, spec),
+            format,
+        )?,
+        "SignedBeaconBlockBase" | "SignedBeaconBlockPhase0" => {
+            decode_and_print(&bytes, SignedBeaconBlockBase::<T>::from_ssz_bytes, format)?
+        }
+        "SignedBeaconBlockAltair" => {
+            decode_and_print(&bytes, SignedBeaconBlockAltair::<T>::from_ssz_bytes, format)?
+        }
+        "SignedBeaconBlockMerge" | "SignedBeaconBlockBellatrix" => {
+            decode_and_print(&bytes, SignedBeaconBlockMerge::<T>::from_ssz_bytes, format)?
+        }
+        "SignedBeaconBlockCapella" => decode_and_print(
+            &bytes,
+            SignedBeaconBlockCapella::<T>::from_ssz_bytes,
+            format,
+        )?,
+        "BeaconState" => decode_and_print::<BeaconState<T>>(
+            &bytes,
+            |bytes| BeaconState::from_ssz_bytes(bytes, spec),
+            format,
+        )?,
+        "BeaconStateBase" | "BeaconStatePhase0" => {
+            decode_and_print(&bytes, BeaconStateBase::<T>::from_ssz_bytes, format)?
+        }
+        "BeaconStateAltair" => {
+            decode_and_print(&bytes, BeaconStateAltair::<T>::from_ssz_bytes, format)?
+        }
+        "BeaconStateMerge" | "BeaconStateBellatrix" => {
+            decode_and_print(&bytes, BeaconStateMerge::<T>::from_ssz_bytes, format)?
+        }
+        "BeaconStateCapella" => {
+            decode_and_print(&bytes, BeaconStateCapella::<T>::from_ssz_bytes, format)?
+        }
         other => return Err(format!("Unknown type: {}", other)),
     };
 
     Ok(())
 }
 
-fn decode_and_print<T: Decode + Serialize>(
+fn decode_and_print<T: Serialize>(
     bytes: &[u8],
+    decoder: impl FnOnce(&[u8]) -> Result<T, ssz::DecodeError>,
     output_format: OutputFormat,
 ) -> Result<(), String> {
-    let item = T::from_ssz_bytes(bytes).map_err(|e| format!("SSZ decode failed: {:?}", e))?;
+    let item = decoder(bytes).map_err(|e| format!("SSZ decode failed: {e:?}"))?;
 
     match output_format {
         OutputFormat::Json => {
             println!(
                 "{}",
                 serde_json::to_string(&item)
-                    .map_err(|e| format!("Unable to write object to JSON: {:?}", e))?
+                    .map_err(|e| format!("Unable to write object to JSON: {e:?}"))?
             );
         }
         OutputFormat::Yaml => {
             println!(
                 "{}",
                 serde_yaml::to_string(&item)
-                    .map_err(|e| format!("Unable to write object to YAML: {:?}", e))?
+                    .map_err(|e| format!("Unable to write object to YAML: {e:?}"))?
             );
         }
     }
diff --git a/lcli/src/skip_slots.rs b/lcli/src/skip_slots.rs
index e3b2a5acbf..31fe9fe648 100644
--- a/lcli/src/skip_slots.rs
+++ b/lcli/src/skip_slots.rs
@@ -49,6 +49,7 @@ use clap::ArgMatches;
 use clap_utils::{parse_optional, parse_required};
 use environment::Environment;
 use eth2::{types::StateId, BeaconNodeHttpClient, SensitiveUrl, Timeouts};
+use eth2_network_config::Eth2NetworkConfig;
 use ssz::Encode;
 use state_processing::state_advance::{complete_state_advance, partial_state_advance};
 use std::fs::File;
@@ -59,8 +60,12 @@ use types::{BeaconState, CloneConfig, EthSpec, Hash256};
 
 const HTTP_TIMEOUT: Duration = Duration::from_secs(10);
 
-pub fn run<T: EthSpec>(env: Environment<T>, matches: &ArgMatches) -> Result<(), String> {
-    let spec = &T::default_spec();
+pub fn run<T: EthSpec>(
+    env: Environment<T>,
+    network_config: Eth2NetworkConfig,
+    matches: &ArgMatches,
+) -> Result<(), String> {
+    let spec = &network_config.chain_spec::<T>()?;
     let executor = env.core_context().executor;
 
     let output_path: Option<PathBuf> = parse_optional(matches, "output-path")?;
diff --git a/lcli/src/state_root.rs b/lcli/src/state_root.rs
new file mode 100644
index 0000000000..efcee2827a
--- /dev/null
+++ b/lcli/src/state_root.rs
@@ -0,0 +1,76 @@
+use crate::transition_blocks::load_from_ssz_with;
+use clap::ArgMatches;
+use clap_utils::{parse_optional, parse_required};
+use environment::Environment;
+use eth2::{types::StateId, BeaconNodeHttpClient, SensitiveUrl, Timeouts};
+use eth2_network_config::Eth2NetworkConfig;
+use std::path::PathBuf;
+use std::time::{Duration, Instant};
+use types::{BeaconState, EthSpec};
+
+const HTTP_TIMEOUT: Duration = Duration::from_secs(10);
+
+pub fn run<T: EthSpec>(
+    env: Environment<T>,
+    network_config: Eth2NetworkConfig,
+    matches: &ArgMatches,
+) -> Result<(), String> {
+    let executor = env.core_context().executor;
+
+    let spec = &network_config.chain_spec::<T>()?;
+
+    let state_path: Option<PathBuf> = parse_optional(matches, "state-path")?;
+    let beacon_url: Option<SensitiveUrl> = parse_optional(matches, "beacon-url")?;
+    let runs: usize = parse_required(matches, "runs")?;
+
+    info!(
+        "Using {} network ({} spec)",
+        spec.config_name.as_deref().unwrap_or("unknown"),
+        T::spec_name()
+    );
+    info!("Doing {} runs", runs);
+
+    let state = match (state_path, beacon_url) {
+        (Some(state_path), None) => {
+            info!("State path: {:?}", state_path);
+            load_from_ssz_with(&state_path, spec, BeaconState::from_ssz_bytes)?
+        }
+        (None, Some(beacon_url)) => {
+            let state_id: StateId = parse_required(matches, "state-id")?;
+            let client = BeaconNodeHttpClient::new(beacon_url, Timeouts::set_all(HTTP_TIMEOUT));
+            executor
+                .handle()
+                .ok_or("shutdown in progress")?
+                .block_on(async move {
+                    client
+                        .get_debug_beacon_states::<T>(state_id)
+                        .await
+                        .map_err(|e| format!("Failed to download state: {:?}", e))
+                })
+                .map_err(|e| format!("Failed to complete task: {:?}", e))?
+                .ok_or_else(|| format!("Unable to locate state at {:?}", state_id))?
+                .data
+        }
+        _ => return Err("must supply either --state-path or --beacon-url".into()),
+    };
+
+    /*
+     * Perform the core "runs".
+     */
+    let mut state_root = None;
+    for i in 0..runs {
+        let mut state = state.clone();
+        let timer = Instant::now();
+        state_root = Some(
+            state
+                .update_tree_hash_cache()
+                .map_err(|e| format!("error computing state root: {e:?}"))?,
+        );
+        info!("Run {}: {:?}", i, timer.elapsed());
+    }
+
+    if let Some(state_root) = state_root {
+        info!("State root is {:?}", state_root);
+    }
+    Ok(())
+}
diff --git a/lcli/src/transition_blocks.rs b/lcli/src/transition_blocks.rs
index 34a4560761..23b0ae2620 100644
--- a/lcli/src/transition_blocks.rs
+++ b/lcli/src/transition_blocks.rs
@@ -71,10 +71,12 @@ use eth2::{
     types::{BlockId, StateId},
     BeaconNodeHttpClient, SensitiveUrl, Timeouts,
 };
+use eth2_network_config::Eth2NetworkConfig;
 use ssz::Encode;
+use state_processing::state_advance::complete_state_advance;
 use state_processing::{
-    block_signature_verifier::BlockSignatureVerifier, per_block_processing, per_slot_processing,
-    BlockSignatureStrategy, ConsensusContext, StateProcessingStrategy, VerifyBlockRoot,
+    block_signature_verifier::BlockSignatureVerifier, per_block_processing, BlockSignatureStrategy,
+    ConsensusContext, StateProcessingStrategy, VerifyBlockRoot,
 };
 use std::borrow::Cow;
 use std::fs::File;
@@ -94,8 +96,12 @@ struct Config {
     exclude_post_block_thc: bool,
 }
 
-pub fn run<T: EthSpec>(env: Environment<T>, matches: &ArgMatches) -> Result<(), String> {
-    let spec = &T::default_spec();
+pub fn run<T: EthSpec>(
+    env: Environment<T>,
+    network_config: Eth2NetworkConfig,
+    matches: &ArgMatches,
+) -> Result<(), String> {
+    let spec = &network_config.chain_spec::<T>()?;
     let executor = env.core_context().executor;
 
     /*
@@ -327,10 +333,8 @@ fn do_transition<T: EthSpec>(
 
     // Transition the parent state to the block slot.
     let t = Instant::now();
-    for i in pre_state.slot().as_u64()..block.slot().as_u64() {
-        per_slot_processing(&mut pre_state, Some(state_root), spec)
-            .map_err(|e| format!("Failed to advance slot on iteration {}: {:?}", i, e))?;
-    }
+    complete_state_advance(&mut pre_state, Some(state_root), block.slot(), spec)
+        .map_err(|e| format!("Unable to perform complete advance: {e:?}"))?;
     debug!("Slot processing: {:?}", t.elapsed());
 
     let t = Instant::now();
diff --git a/lighthouse/Cargo.toml b/lighthouse/Cargo.toml
index e7746a2db9..012276f4ce 100644
--- a/lighthouse/Cargo.toml
+++ b/lighthouse/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "lighthouse"
-version = "4.3.0"
+version = "4.4.1"
 authors = ["Sigma Prime <contact@sigmaprime.io>"]
 edition = "2021"
 autotests = false
@@ -56,6 +56,7 @@ directory = { path = "../common/directory" }
 unused_port = { path = "../common/unused_port" }
 database_manager = { path = "../database_manager" }
 slasher = { path = "../slasher" }
+validator_manager = { path = "../validator_manager" }
 
 [dev-dependencies]
 tempfile = "3.1.0"
@@ -64,6 +65,8 @@ slashing_protection = { path = "../validator_client/slashing_protection" }
 lighthouse_network = { path = "../beacon_node/lighthouse_network" }
 sensitive_url = { path = "../common/sensitive_url" }
 eth1 = { path = "../beacon_node/eth1" }
+eth2 = { path = "../common/eth2" }
+beacon_processor = { path = "../beacon_node/beacon_processor" }
 
 [[test]]
 name = "lighthouse_tests"
diff --git a/lighthouse/environment/src/lib.rs b/lighthouse/environment/src/lib.rs
index 53915b52d9..fc7ab8d52c 100644
--- a/lighthouse/environment/src/lib.rs
+++ b/lighthouse/environment/src/lib.rs
@@ -344,18 +344,6 @@ impl<E: EthSpec> EnvironmentBuilder<E> {
         Ok(self)
     }
 
-    /// Optionally adds a network configuration to the environment.
-    pub fn optional_eth2_network_config(
-        self,
-        optional_config: Option<Eth2NetworkConfig>,
-    ) -> Result<Self, String> {
-        if let Some(config) = optional_config {
-            self.eth2_network_config(config)
-        } else {
-            Ok(self)
-        }
-    }
-
     /// Consumes the builder, returning an `Environment`.
     pub fn build(self) -> Result<Environment<E>, String> {
         let (signal, exit) = exit_future::signal();
diff --git a/lighthouse/environment/tests/testnet_dir/config.yaml b/lighthouse/environment/tests/testnet_dir/config.yaml
index 33aa8ad165..b98145163c 100644
--- a/lighthouse/environment/tests/testnet_dir/config.yaml
+++ b/lighthouse/environment/tests/testnet_dir/config.yaml
@@ -81,3 +81,17 @@ PROPOSER_SCORE_BOOST: 40
 DEPOSIT_CHAIN_ID: 1
 DEPOSIT_NETWORK_ID: 1
 DEPOSIT_CONTRACT_ADDRESS: 0x00000000219ab540356cBB839Cbe05303d7705Fa
+
+# Network
+# ---------------------------------------------------------------
+SUBNETS_PER_NODE: 2
+GOSSIP_MAX_SIZE: 10485760
+MIN_EPOCHS_FOR_BLOCK_REQUESTS: 33024
+MAX_CHUNK_SIZE: 10485760
+TTFB_TIMEOUT: 5
+RESP_TIMEOUT: 10
+MESSAGE_DOMAIN_INVALID_SNAPPY: 0x00000000
+MESSAGE_DOMAIN_VALID_SNAPPY: 0x01000000
+ATTESTATION_SUBNET_COUNT: 64
+ATTESTATION_SUBNET_EXTRA_BITS: 0
+ATTESTATION_SUBNET_PREFIX_BITS: 6
diff --git a/lighthouse/src/main.rs b/lighthouse/src/main.rs
index b814639ceb..6384fc53cd 100644
--- a/lighthouse/src/main.rs
+++ b/lighthouse/src/main.rs
@@ -324,11 +324,36 @@ fn main() {
                 .takes_value(true)
                 .global(true)
         )
+        .arg(
+            Arg::with_name("genesis-state-url")
+                .long("genesis-state-url")
+                .value_name("URL")
+                .help(
+                    "A URL of a beacon-API compatible server from which to download the genesis state. \
+                    Checkpoint sync server URLs can generally be used with this flag. \
+                    If not supplied, a default URL or the --checkpoint-sync-url may be used. \
+                    If the genesis state is already included in this binary then this value will be ignored.",
+                )
+                .takes_value(true)
+                .global(true),
+        )
+        .arg(
+            Arg::with_name("genesis-state-url-timeout")
+                .long("genesis-state-url-timeout")
+                .value_name("SECONDS")
+                .help(
+                    "The timeout in seconds for the request to --genesis-state-url.",
+                )
+                .takes_value(true)
+                .default_value("180")
+                .global(true),
+        )
         .subcommand(beacon_node::cli_app())
         .subcommand(boot_node::cli_app())
         .subcommand(validator_client::cli_app())
         .subcommand(account_manager::cli_app())
         .subcommand(database_manager::cli_app())
+        .subcommand(validator_manager::cli_app())
         .get_matches();
 
     // Configure the allocator early in the process, before it has the chance to use the default values for
@@ -512,7 +537,7 @@ fn run<E: EthSpec>(
 
     let mut environment = builder
         .multi_threaded_tokio_runtime()?
-        .optional_eth2_network_config(Some(eth2_network_config))?
+        .eth2_network_config(eth2_network_config)?
         .build()?;
 
     let log = environment.core_context().log().clone();
@@ -558,7 +583,7 @@ fn run<E: EthSpec>(
         (Some(_), Some(_)) => panic!("CLI prevents both --network and --testnet-dir"),
     };
 
-    if let Some(sub_matches) = matches.subcommand_matches("account_manager") {
+    if let Some(sub_matches) = matches.subcommand_matches(account_manager::CMD) {
         eprintln!("Running account manager for {} network", network_name);
         // Pass the entire `environment` to the account manager so it can run blocking operations.
         account_manager::run(sub_matches, environment)?;
@@ -567,6 +592,16 @@ fn run<E: EthSpec>(
         return Ok(());
     }
 
+    if let Some(sub_matches) = matches.subcommand_matches(validator_manager::CMD) {
+        eprintln!("Running validator manager for {} network", network_name);
+
+        // Pass the entire `environment` to the account manager so it can run blocking operations.
+        validator_manager::run::<E>(sub_matches, environment)?;
+
+        // Exit as soon as account manager returns control.
+        return Ok(());
+    }
+
     if let Some(sub_matches) = matches.subcommand_matches(database_manager::CMD) {
         info!(log, "Running database manager for {} network", network_name);
         // Pass the entire `environment` to the database manager so it can run blocking operations.
diff --git a/lighthouse/tests/beacon_node.rs b/lighthouse/tests/beacon_node.rs
index 9b6d23ddcf..05b4358509 100644
--- a/lighthouse/tests/beacon_node.rs
+++ b/lighthouse/tests/beacon_node.rs
@@ -5,11 +5,13 @@ use beacon_node::beacon_chain::chain_config::{
     DisallowedReOrgOffsets, DEFAULT_RE_ORG_CUTOFF_DENOMINATOR,
     DEFAULT_RE_ORG_MAX_EPOCHS_SINCE_FINALIZATION, DEFAULT_RE_ORG_THRESHOLD,
 };
+use beacon_processor::BeaconProcessorConfig;
 use eth1::Eth1Endpoint;
 use lighthouse_network::PeerId;
 use std::fs::File;
 use std::io::{Read, Write};
 use std::net::{IpAddr, Ipv4Addr, Ipv6Addr};
+use std::path::Path;
 use std::path::PathBuf;
 use std::process::Command;
 use std::str::FromStr;
@@ -177,7 +179,7 @@ fn checkpoint_sync_url_timeout_default() {
     CommandLineTest::new()
         .run_with_zero_port()
         .with_config(|config| {
-            assert_eq!(config.chain.checkpoint_sync_url_timeout, 60);
+            assert_eq!(config.chain.checkpoint_sync_url_timeout, 180);
         });
 }
 
@@ -365,21 +367,6 @@ fn genesis_backfill_with_historic_flag() {
         .with_config(|config| assert_eq!(config.chain.genesis_backfill, true));
 }
 
-#[test]
-fn always_prefer_builder_payload_flag() {
-    CommandLineTest::new()
-        .flag("always-prefer-builder-payload", None)
-        .run_with_zero_port()
-        .with_config(|config| assert!(config.always_prefer_builder_payload));
-}
-
-#[test]
-fn no_flag_sets_always_prefer_builder_payload_to_false() {
-    CommandLineTest::new()
-        .run_with_zero_port()
-        .with_config(|config| assert!(!config.always_prefer_builder_payload));
-}
-
 // Tests for Eth1 flags.
 #[test]
 fn dummy_eth1_flag() {
@@ -734,6 +721,38 @@ fn builder_fallback_flags() {
             );
         },
     );
+    run_payload_builder_flag_test_with_config(
+        "builder",
+        "http://meow.cats",
+        Some("always-prefer-builder-payload"),
+        None,
+        |config| {
+            assert_eq!(
+                config
+                    .execution_layer
+                    .as_ref()
+                    .unwrap()
+                    .always_prefer_builder_payload,
+                true
+            );
+        },
+    );
+    run_payload_builder_flag_test_with_config(
+        "builder",
+        "http://meow.cats",
+        None,
+        None,
+        |config| {
+            assert_eq!(
+                config
+                    .execution_layer
+                    .as_ref()
+                    .unwrap()
+                    .always_prefer_builder_payload,
+                false
+            );
+        },
+    );
 }
 
 #[test]
@@ -1118,13 +1137,13 @@ fn disable_backfill_rate_limiting_flag() {
     CommandLineTest::new()
         .flag("disable-backfill-rate-limiting", None)
         .run_with_zero_port()
-        .with_config(|config| assert!(!config.chain.enable_backfill_rate_limiting));
+        .with_config(|config| assert!(!config.beacon_processor.enable_backfill_rate_limiting));
 }
 #[test]
 fn default_backfill_rate_limiting_flag() {
     CommandLineTest::new()
         .run_with_zero_port()
-        .with_config(|config| assert!(config.chain.enable_backfill_rate_limiting));
+        .with_config(|config| assert!(config.beacon_processor.enable_backfill_rate_limiting));
 }
 #[test]
 fn default_boot_nodes() {
@@ -1442,15 +1461,20 @@ fn disable_inbound_rate_limiter_flag() {
 #[test]
 fn http_allow_origin_flag() {
     CommandLineTest::new()
-        .flag("http-allow-origin", Some("127.0.0.99"))
+        .flag("http", None)
+        .flag("http-allow-origin", Some("http://127.0.0.99"))
         .run_with_zero_port()
         .with_config(|config| {
-            assert_eq!(config.http_api.allow_origin, Some("127.0.0.99".to_string()));
+            assert_eq!(
+                config.http_api.allow_origin,
+                Some("http://127.0.0.99".to_string())
+            );
         });
 }
 #[test]
 fn http_allow_origin_all_flag() {
     CommandLineTest::new()
+        .flag("http", None)
         .flag("http-allow-origin", Some("*"))
         .run_with_zero_port()
         .with_config(|config| assert_eq!(config.http_api.allow_origin, Some("*".to_string())));
@@ -1458,23 +1482,37 @@ fn http_allow_origin_all_flag() {
 #[test]
 fn http_allow_sync_stalled_flag() {
     CommandLineTest::new()
+        .flag("http", None)
         .flag("http-allow-sync-stalled", None)
         .run_with_zero_port()
         .with_config(|config| assert_eq!(config.http_api.allow_sync_stalled, true));
 }
 #[test]
-fn http_tls_flags() {
-    let dir = TempDir::new().expect("Unable to create temporary directory");
+fn http_enable_beacon_processor() {
     CommandLineTest::new()
+        .flag("http", None)
+        .run_with_zero_port()
+        .with_config(|config| assert_eq!(config.http_api.enable_beacon_processor, true));
+
+    CommandLineTest::new()
+        .flag("http", None)
+        .flag("http-enable-beacon-processor", Some("true"))
+        .run_with_zero_port()
+        .with_config(|config| assert_eq!(config.http_api.enable_beacon_processor, true));
+
+    CommandLineTest::new()
+        .flag("http", None)
+        .flag("http-enable-beacon-processor", Some("false"))
+        .run_with_zero_port()
+        .with_config(|config| assert_eq!(config.http_api.enable_beacon_processor, false));
+}
+#[test]
+fn http_tls_flags() {
+    CommandLineTest::new()
+        .flag("http", None)
         .flag("http-enable-tls", None)
-        .flag(
-            "http-tls-cert",
-            dir.path().join("certificate.crt").as_os_str().to_str(),
-        )
-        .flag(
-            "http-tls-key",
-            dir.path().join("private.key").as_os_str().to_str(),
-        )
+        .flag("http-tls-cert", Some("tests/tls/cert.pem"))
+        .flag("http-tls-key", Some("tests/tls/key.rsa"))
         .run_with_zero_port()
         .with_config(|config| {
             let tls_config = config
@@ -1482,14 +1520,15 @@ fn http_tls_flags() {
                 .tls_config
                 .as_ref()
                 .expect("tls_config was empty.");
-            assert_eq!(tls_config.cert, dir.path().join("certificate.crt"));
-            assert_eq!(tls_config.key, dir.path().join("private.key"));
+            assert_eq!(tls_config.cert, Path::new("tests/tls/cert.pem"));
+            assert_eq!(tls_config.key, Path::new("tests/tls/key.rsa"));
         });
 }
 
 #[test]
 fn http_spec_fork_default() {
     CommandLineTest::new()
+        .flag("http", None)
         .run_with_zero_port()
         .with_config(|config| assert_eq!(config.http_api.spec_fork_name, None));
 }
@@ -1497,6 +1536,7 @@ fn http_spec_fork_default() {
 #[test]
 fn http_spec_fork_override() {
     CommandLineTest::new()
+        .flag("http", None)
         .flag("http-spec-fork", Some("altair"))
         .run_with_zero_port()
         .with_config(|config| assert_eq!(config.http_api.spec_fork_name, Some(ForkName::Altair)));
@@ -1733,6 +1773,24 @@ fn no_reconstruct_historic_states_flag() {
         .run_with_zero_port()
         .with_config(|config| assert!(!config.chain.reconstruct_historic_states));
 }
+#[test]
+fn epochs_per_migration_default() {
+    CommandLineTest::new()
+        .run_with_zero_port()
+        .with_config(|config| {
+            assert_eq!(
+                config.chain.epochs_per_migration,
+                beacon_node::beacon_chain::migrate::DEFAULT_EPOCHS_PER_MIGRATION
+            )
+        });
+}
+#[test]
+fn epochs_per_migration_override() {
+    CommandLineTest::new()
+        .flag("epochs-per-migration", Some("128"))
+        .run_with_zero_port()
+        .with_config(|config| assert_eq!(config.chain.epochs_per_migration, 128));
+}
 
 // Tests for Slasher flags.
 // Using `--slasher-max-db-size` to work around https://github.com/sigp/lighthouse/issues/2342
@@ -2277,3 +2335,99 @@ fn progressive_balances_fast() {
             )
         });
 }
+
+#[test]
+fn beacon_processor() {
+    CommandLineTest::new()
+        .run_with_zero_port()
+        .with_config(|config| assert_eq!(config.beacon_processor, <_>::default()));
+
+    CommandLineTest::new()
+        .flag("beacon-processor-max-workers", Some("1"))
+        .flag("beacon-processor-work-queue-len", Some("2"))
+        .flag("beacon-processor-reprocess-queue-len", Some("3"))
+        .flag("beacon-processor-attestation-batch-size", Some("4"))
+        .flag("beacon-processor-aggregate-batch-size", Some("5"))
+        .flag("disable-backfill-rate-limiting", None)
+        .run_with_zero_port()
+        .with_config(|config| {
+            assert_eq!(
+                config.beacon_processor,
+                BeaconProcessorConfig {
+                    max_workers: 1,
+                    max_work_event_queue_len: 2,
+                    max_scheduled_work_queue_len: 3,
+                    max_gossip_attestation_batch_size: 4,
+                    max_gossip_aggregate_batch_size: 5,
+                    enable_backfill_rate_limiting: false
+                }
+            )
+        });
+}
+
+#[test]
+#[should_panic]
+fn beacon_processor_zero_workers() {
+    CommandLineTest::new()
+        .flag("beacon-processor-max-workers", Some("0"))
+        .run_with_zero_port();
+}
+
+#[test]
+fn http_sse_capacity_multiplier_default() {
+    CommandLineTest::new()
+        .run_with_zero_port()
+        .with_config(|config| assert_eq!(config.http_api.sse_capacity_multiplier, 1));
+}
+
+#[test]
+fn http_sse_capacity_multiplier_override() {
+    CommandLineTest::new()
+        .flag("http-sse-capacity-multiplier", Some("10"))
+        .run_with_zero_port()
+        .with_config(|config| assert_eq!(config.http_api.sse_capacity_multiplier, 10));
+}
+
+#[test]
+fn http_duplicate_block_status_default() {
+    CommandLineTest::new()
+        .run_with_zero_port()
+        .with_config(|config| {
+            assert_eq!(config.http_api.duplicate_block_status_code.as_u16(), 202)
+        });
+}
+
+#[test]
+fn http_duplicate_block_status_override() {
+    CommandLineTest::new()
+        .flag("http-duplicate-block-status", Some("301"))
+        .run_with_zero_port()
+        .with_config(|config| {
+            assert_eq!(config.http_api.duplicate_block_status_code.as_u16(), 301)
+        });
+}
+
+#[test]
+fn genesis_state_url_default() {
+    CommandLineTest::new()
+        .run_with_zero_port()
+        .with_config(|config| {
+            assert_eq!(config.genesis_state_url, None);
+            assert_eq!(config.genesis_state_url_timeout, Duration::from_secs(180));
+        });
+}
+
+#[test]
+fn genesis_state_url_value() {
+    CommandLineTest::new()
+        .flag("genesis-state-url", Some("http://genesis.com"))
+        .flag("genesis-state-url-timeout", Some("42"))
+        .run_with_zero_port()
+        .with_config(|config| {
+            assert_eq!(
+                config.genesis_state_url.as_deref(),
+                Some("http://genesis.com")
+            );
+            assert_eq!(config.genesis_state_url_timeout, Duration::from_secs(42));
+        });
+}
diff --git a/lighthouse/tests/main.rs b/lighthouse/tests/main.rs
index 806524cab0..bf587f79df 100644
--- a/lighthouse/tests/main.rs
+++ b/lighthouse/tests/main.rs
@@ -5,3 +5,4 @@ mod beacon_node;
 mod boot_node;
 mod exec;
 mod validator_client;
+mod validator_manager;
diff --git a/lighthouse/tests/tls/cert.pem b/lighthouse/tests/tls/cert.pem
new file mode 100644
index 0000000000..03af12ff81
--- /dev/null
+++ b/lighthouse/tests/tls/cert.pem
@@ -0,0 +1,24 @@
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----
diff --git a/lighthouse/tests/tls/key.rsa b/lighthouse/tests/tls/key.rsa
new file mode 100644
index 0000000000..b13bf5d07f
--- /dev/null
+++ b/lighthouse/tests/tls/key.rsa
@@ -0,0 +1,27 @@
+-----BEGIN RSA PRIVATE KEY-----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+-----END RSA PRIVATE KEY-----
diff --git a/lighthouse/tests/validator_client.rs b/lighthouse/tests/validator_client.rs
index 27d7c10e96..062b7e7786 100644
--- a/lighthouse/tests/validator_client.rs
+++ b/lighthouse/tests/validator_client.rs
@@ -260,6 +260,7 @@ fn http_flag() {
 fn http_address_flag() {
     let addr = "127.0.0.99".parse::<IpAddr>().unwrap();
     CommandLineTest::new()
+        .flag("http", None)
         .flag("http-address", Some("127.0.0.99"))
         .flag("unencrypted-http-transport", None)
         .run()
@@ -269,6 +270,7 @@ fn http_address_flag() {
 fn http_address_ipv6_flag() {
     let addr = "::1".parse::<IpAddr>().unwrap();
     CommandLineTest::new()
+        .flag("http", None)
         .flag("http-address", Some("::1"))
         .flag("unencrypted-http-transport", None)
         .run()
@@ -279,6 +281,7 @@ fn http_address_ipv6_flag() {
 fn missing_unencrypted_http_transport_flag() {
     let addr = "127.0.0.99".parse::<IpAddr>().unwrap();
     CommandLineTest::new()
+        .flag("http", None)
         .flag("http-address", Some("127.0.0.99"))
         .run()
         .with_config(|config| assert_eq!(config.http_api.listen_addr, addr));
@@ -286,6 +289,7 @@ fn missing_unencrypted_http_transport_flag() {
 #[test]
 fn http_port_flag() {
     CommandLineTest::new()
+        .flag("http", None)
         .flag("http-port", Some("9090"))
         .run()
         .with_config(|config| assert_eq!(config.http_api.listen_port, 9090));
@@ -293,6 +297,7 @@ fn http_port_flag() {
 #[test]
 fn http_allow_origin_flag() {
     CommandLineTest::new()
+        .flag("http", None)
         .flag("http-allow-origin", Some("http://localhost:9009"))
         .run()
         .with_config(|config| {
@@ -305,10 +310,41 @@ fn http_allow_origin_flag() {
 #[test]
 fn http_allow_origin_all_flag() {
     CommandLineTest::new()
+        .flag("http", None)
         .flag("http-allow-origin", Some("*"))
         .run()
         .with_config(|config| assert_eq!(config.http_api.allow_origin, Some("*".to_string())));
 }
+#[test]
+fn http_allow_keystore_export_default() {
+    CommandLineTest::new()
+        .flag("http", None)
+        .run()
+        .with_config(|config| assert!(!config.http_api.allow_keystore_export));
+}
+#[test]
+fn http_allow_keystore_export_present() {
+    CommandLineTest::new()
+        .flag("http", None)
+        .flag("http-allow-keystore-export", None)
+        .run()
+        .with_config(|config| assert!(config.http_api.allow_keystore_export));
+}
+#[test]
+fn http_store_keystore_passwords_in_secrets_dir_default() {
+    CommandLineTest::new()
+        .flag("http", None)
+        .run()
+        .with_config(|config| assert!(!config.http_api.store_passwords_in_secrets_dir));
+}
+#[test]
+fn http_store_keystore_passwords_in_secrets_dir_present() {
+    CommandLineTest::new()
+        .flag("http", None)
+        .flag("http-store-passwords-in-secrets-dir", None)
+        .run()
+        .with_config(|config| assert!(config.http_api.store_passwords_in_secrets_dir));
+}
 
 // Tests for Metrics flags.
 #[test]
@@ -322,6 +358,7 @@ fn metrics_flag() {
 fn metrics_address_flag() {
     let addr = "127.0.0.99".parse::<IpAddr>().unwrap();
     CommandLineTest::new()
+        .flag("metrics", None)
         .flag("metrics-address", Some("127.0.0.99"))
         .run()
         .with_config(|config| assert_eq!(config.http_metrics.listen_addr, addr));
@@ -330,6 +367,7 @@ fn metrics_address_flag() {
 fn metrics_address_ipv6_flag() {
     let addr = "::1".parse::<IpAddr>().unwrap();
     CommandLineTest::new()
+        .flag("metrics", None)
         .flag("metrics-address", Some("::1"))
         .run()
         .with_config(|config| assert_eq!(config.http_metrics.listen_addr, addr));
@@ -337,6 +375,7 @@ fn metrics_address_ipv6_flag() {
 #[test]
 fn metrics_port_flag() {
     CommandLineTest::new()
+        .flag("metrics", None)
         .flag("metrics-port", Some("9090"))
         .run()
         .with_config(|config| assert_eq!(config.http_metrics.listen_port, 9090));
@@ -344,6 +383,7 @@ fn metrics_port_flag() {
 #[test]
 fn metrics_allow_origin_flag() {
     CommandLineTest::new()
+        .flag("metrics", None)
         .flag("metrics-allow-origin", Some("http://localhost:9009"))
         .run()
         .with_config(|config| {
@@ -356,6 +396,7 @@ fn metrics_allow_origin_flag() {
 #[test]
 fn metrics_allow_origin_all_flag() {
     CommandLineTest::new()
+        .flag("metrics", None)
         .flag("metrics-allow-origin", Some("*"))
         .run()
         .with_config(|config| assert_eq!(config.http_metrics.allow_origin, Some("*".to_string())));
diff --git a/lighthouse/tests/validator_manager.rs b/lighthouse/tests/validator_manager.rs
new file mode 100644
index 0000000000..e0a1e92d6a
--- /dev/null
+++ b/lighthouse/tests/validator_manager.rs
@@ -0,0 +1,344 @@
+use eth2::SensitiveUrl;
+use serde::de::DeserializeOwned;
+use std::fs;
+use std::marker::PhantomData;
+use std::path::PathBuf;
+use std::process::{Command, Stdio};
+use std::str::FromStr;
+use tempfile::{tempdir, TempDir};
+use types::*;
+use validator_manager::{
+    create_validators::CreateConfig,
+    import_validators::ImportConfig,
+    move_validators::{MoveConfig, PasswordSource, Validators},
+};
+
+const EXAMPLE_ETH1_ADDRESS: &str = "0x00000000219ab540356cBB839Cbe05303d7705Fa";
+
+const EXAMPLE_PUBKEY_0: &str = "0x933ad9491b62059dd065b560d256d8957a8c402cc6e8d8ee7290ae11e8f7329267a8811c397529dac52ae1342ba58c95";
+const EXAMPLE_PUBKEY_1: &str = "0xa1d1ad0714035353258038e964ae9675dc0252ee22cea896825c01458e1807bfad2f9969338798548d9858a571f7425c";
+
+struct CommandLineTest<T> {
+    cmd: Command,
+    config_path: PathBuf,
+    _dir: TempDir,
+    _phantom: PhantomData<T>,
+}
+
+impl<T> Default for CommandLineTest<T> {
+    fn default() -> Self {
+        let dir = tempdir().unwrap();
+        let config_path = dir.path().join("config.json");
+        let mut cmd = Command::new(env!("CARGO_BIN_EXE_lighthouse"));
+        cmd.arg("--dump-config")
+            .arg(config_path.as_os_str())
+            .arg("validator-manager")
+            .stdin(Stdio::null())
+            .stdout(Stdio::null())
+            .stderr(Stdio::null());
+        Self {
+            cmd,
+            config_path,
+            _dir: dir,
+            _phantom: PhantomData,
+        }
+    }
+}
+
+impl<T> CommandLineTest<T> {
+    fn flag(mut self, flag: &str, value: Option<&str>) -> Self {
+        self.cmd.arg(flag);
+        if let Some(value) = value {
+            self.cmd.arg(value);
+        }
+        self
+    }
+
+    fn run(mut cmd: Command, should_succeed: bool) {
+        let output = cmd.output().expect("process should complete");
+        if output.status.success() != should_succeed {
+            let stdout = String::from_utf8(output.stdout).unwrap();
+            let stderr = String::from_utf8(output.stderr).unwrap();
+            eprintln!("{}", stdout);
+            eprintln!("{}", stderr);
+            panic!(
+                "Command success was {} when expecting {}",
+                !should_succeed, should_succeed
+            );
+        }
+    }
+}
+
+impl<T: DeserializeOwned> CommandLineTest<T> {
+    fn assert_success<F: Fn(T)>(self, func: F) {
+        Self::run(self.cmd, true);
+        let contents = fs::read_to_string(self.config_path).unwrap();
+        let config: T = serde_json::from_str(&contents).unwrap();
+        func(config)
+    }
+
+    fn assert_failed(self) {
+        Self::run(self.cmd, false);
+    }
+}
+
+impl CommandLineTest<CreateConfig> {
+    fn validators_create() -> Self {
+        Self::default().flag("create", None)
+    }
+}
+
+impl CommandLineTest<ImportConfig> {
+    fn validators_import() -> Self {
+        Self::default().flag("import", None)
+    }
+}
+
+impl CommandLineTest<MoveConfig> {
+    fn validators_move() -> Self {
+        Self::default().flag("move", None)
+    }
+}
+
+#[test]
+pub fn validator_create_without_output_path() {
+    CommandLineTest::validators_create().assert_failed();
+}
+
+#[test]
+pub fn validator_create_defaults() {
+    CommandLineTest::validators_create()
+        .flag("--output-path", Some("./meow"))
+        .flag("--count", Some("1"))
+        .assert_success(|config| {
+            let expected = CreateConfig {
+                output_path: PathBuf::from("./meow"),
+                first_index: 0,
+                count: 1,
+                deposit_gwei: MainnetEthSpec::default_spec().max_effective_balance,
+                mnemonic_path: None,
+                stdin_inputs: cfg!(windows) || false,
+                disable_deposits: false,
+                specify_voting_keystore_password: false,
+                eth1_withdrawal_address: None,
+                builder_proposals: None,
+                fee_recipient: None,
+                gas_limit: None,
+                bn_url: None,
+                force_bls_withdrawal_credentials: false,
+            };
+            assert_eq!(expected, config);
+        });
+}
+
+#[test]
+pub fn validator_create_misc_flags() {
+    CommandLineTest::validators_create()
+        .flag("--output-path", Some("./meow"))
+        .flag("--deposit-gwei", Some("42"))
+        .flag("--first-index", Some("12"))
+        .flag("--count", Some("9"))
+        .flag("--mnemonic-path", Some("./woof"))
+        .flag("--stdin-inputs", None)
+        .flag("--specify-voting-keystore-password", None)
+        .flag("--eth1-withdrawal-address", Some(EXAMPLE_ETH1_ADDRESS))
+        .flag("--builder-proposals", Some("true"))
+        .flag("--suggested-fee-recipient", Some(EXAMPLE_ETH1_ADDRESS))
+        .flag("--gas-limit", Some("1337"))
+        .flag("--beacon-node", Some("http://localhost:1001"))
+        .flag("--force-bls-withdrawal-credentials", None)
+        .assert_success(|config| {
+            let expected = CreateConfig {
+                output_path: PathBuf::from("./meow"),
+                first_index: 12,
+                count: 9,
+                deposit_gwei: 42,
+                mnemonic_path: Some(PathBuf::from("./woof")),
+                stdin_inputs: true,
+                disable_deposits: false,
+                specify_voting_keystore_password: true,
+                eth1_withdrawal_address: Some(Address::from_str(EXAMPLE_ETH1_ADDRESS).unwrap()),
+                builder_proposals: Some(true),
+                fee_recipient: Some(Address::from_str(EXAMPLE_ETH1_ADDRESS).unwrap()),
+                gas_limit: Some(1337),
+                bn_url: Some(SensitiveUrl::parse("http://localhost:1001").unwrap()),
+                force_bls_withdrawal_credentials: true,
+            };
+            assert_eq!(expected, config);
+        });
+}
+
+#[test]
+pub fn validator_create_disable_deposits() {
+    CommandLineTest::validators_create()
+        .flag("--output-path", Some("./meow"))
+        .flag("--count", Some("1"))
+        .flag("--disable-deposits", None)
+        .flag("--builder-proposals", Some("false"))
+        .assert_success(|config| {
+            assert_eq!(config.disable_deposits, true);
+            assert_eq!(config.builder_proposals, Some(false));
+        });
+}
+
+#[test]
+pub fn validator_import_defaults() {
+    CommandLineTest::validators_import()
+        .flag("--validators-file", Some("./vals.json"))
+        .flag("--vc-token", Some("./token.json"))
+        .assert_success(|config| {
+            let expected = ImportConfig {
+                validators_file_path: PathBuf::from("./vals.json"),
+                vc_url: SensitiveUrl::parse("http://localhost:5062").unwrap(),
+                vc_token_path: PathBuf::from("./token.json"),
+                ignore_duplicates: false,
+            };
+            assert_eq!(expected, config);
+        });
+}
+
+#[test]
+pub fn validator_import_misc_flags() {
+    CommandLineTest::validators_import()
+        .flag("--validators-file", Some("./vals.json"))
+        .flag("--vc-token", Some("./token.json"))
+        .flag("--ignore-duplicates", None)
+        .assert_success(|config| {
+            let expected = ImportConfig {
+                validators_file_path: PathBuf::from("./vals.json"),
+                vc_url: SensitiveUrl::parse("http://localhost:5062").unwrap(),
+                vc_token_path: PathBuf::from("./token.json"),
+                ignore_duplicates: true,
+            };
+            assert_eq!(expected, config);
+        });
+}
+
+#[test]
+pub fn validator_import_missing_token() {
+    CommandLineTest::validators_import()
+        .flag("--validators-file", Some("./vals.json"))
+        .assert_failed();
+}
+
+#[test]
+pub fn validator_import_missing_validators_file() {
+    CommandLineTest::validators_import()
+        .flag("--vc-token", Some("./token.json"))
+        .assert_failed();
+}
+
+#[test]
+pub fn validator_move_defaults() {
+    CommandLineTest::validators_move()
+        .flag("--src-vc-url", Some("http://localhost:1"))
+        .flag("--src-vc-token", Some("./1.json"))
+        .flag("--dest-vc-url", Some("http://localhost:2"))
+        .flag("--dest-vc-token", Some("./2.json"))
+        .flag("--validators", Some("all"))
+        .assert_success(|config| {
+            let expected = MoveConfig {
+                src_vc_url: SensitiveUrl::parse("http://localhost:1").unwrap(),
+                src_vc_token_path: PathBuf::from("./1.json"),
+                dest_vc_url: SensitiveUrl::parse("http://localhost:2").unwrap(),
+                dest_vc_token_path: PathBuf::from("./2.json"),
+                validators: Validators::All,
+                builder_proposals: None,
+                fee_recipient: None,
+                gas_limit: None,
+                password_source: PasswordSource::Interactive {
+                    stdin_inputs: cfg!(windows) || false,
+                },
+            };
+            assert_eq!(expected, config);
+        });
+}
+
+#[test]
+pub fn validator_move_misc_flags_0() {
+    CommandLineTest::validators_move()
+        .flag("--src-vc-url", Some("http://localhost:1"))
+        .flag("--src-vc-token", Some("./1.json"))
+        .flag("--dest-vc-url", Some("http://localhost:2"))
+        .flag("--dest-vc-token", Some("./2.json"))
+        .flag(
+            "--validators",
+            Some(&format!("{},{}", EXAMPLE_PUBKEY_0, EXAMPLE_PUBKEY_1)),
+        )
+        .flag("--builder-proposals", Some("true"))
+        .flag("--suggested-fee-recipient", Some(EXAMPLE_ETH1_ADDRESS))
+        .flag("--gas-limit", Some("1337"))
+        .flag("--stdin-inputs", None)
+        .assert_success(|config| {
+            let expected = MoveConfig {
+                src_vc_url: SensitiveUrl::parse("http://localhost:1").unwrap(),
+                src_vc_token_path: PathBuf::from("./1.json"),
+                dest_vc_url: SensitiveUrl::parse("http://localhost:2").unwrap(),
+                dest_vc_token_path: PathBuf::from("./2.json"),
+                validators: Validators::Specific(vec![
+                    PublicKeyBytes::from_str(EXAMPLE_PUBKEY_0).unwrap(),
+                    PublicKeyBytes::from_str(EXAMPLE_PUBKEY_1).unwrap(),
+                ]),
+                builder_proposals: Some(true),
+                fee_recipient: Some(Address::from_str(EXAMPLE_ETH1_ADDRESS).unwrap()),
+                gas_limit: Some(1337),
+                password_source: PasswordSource::Interactive { stdin_inputs: true },
+            };
+            assert_eq!(expected, config);
+        });
+}
+
+#[test]
+pub fn validator_move_misc_flags_1() {
+    CommandLineTest::validators_move()
+        .flag("--src-vc-url", Some("http://localhost:1"))
+        .flag("--src-vc-token", Some("./1.json"))
+        .flag("--dest-vc-url", Some("http://localhost:2"))
+        .flag("--dest-vc-token", Some("./2.json"))
+        .flag("--validators", Some(&format!("{}", EXAMPLE_PUBKEY_0)))
+        .flag("--builder-proposals", Some("false"))
+        .assert_success(|config| {
+            let expected = MoveConfig {
+                src_vc_url: SensitiveUrl::parse("http://localhost:1").unwrap(),
+                src_vc_token_path: PathBuf::from("./1.json"),
+                dest_vc_url: SensitiveUrl::parse("http://localhost:2").unwrap(),
+                dest_vc_token_path: PathBuf::from("./2.json"),
+                validators: Validators::Specific(vec![
+                    PublicKeyBytes::from_str(EXAMPLE_PUBKEY_0).unwrap()
+                ]),
+                builder_proposals: Some(false),
+                fee_recipient: None,
+                gas_limit: None,
+                password_source: PasswordSource::Interactive {
+                    stdin_inputs: cfg!(windows) || false,
+                },
+            };
+            assert_eq!(expected, config);
+        });
+}
+
+#[test]
+pub fn validator_move_count() {
+    CommandLineTest::validators_move()
+        .flag("--src-vc-url", Some("http://localhost:1"))
+        .flag("--src-vc-token", Some("./1.json"))
+        .flag("--dest-vc-url", Some("http://localhost:2"))
+        .flag("--dest-vc-token", Some("./2.json"))
+        .flag("--count", Some("42"))
+        .assert_success(|config| {
+            let expected = MoveConfig {
+                src_vc_url: SensitiveUrl::parse("http://localhost:1").unwrap(),
+                src_vc_token_path: PathBuf::from("./1.json"),
+                dest_vc_url: SensitiveUrl::parse("http://localhost:2").unwrap(),
+                dest_vc_token_path: PathBuf::from("./2.json"),
+                validators: Validators::Count(42),
+                builder_proposals: None,
+                fee_recipient: None,
+                gas_limit: None,
+                password_source: PasswordSource::Interactive {
+                    stdin_inputs: cfg!(windows) || false,
+                },
+            };
+            assert_eq!(expected, config);
+        });
+}
diff --git a/scripts/cross/Dockerfile b/scripts/cross/Dockerfile
deleted file mode 100644
index 5472b980ba..0000000000
--- a/scripts/cross/Dockerfile
+++ /dev/null
@@ -1,14 +0,0 @@
-ARG CROSS_BASE_IMAGE
-FROM $CROSS_BASE_IMAGE
-
-RUN apt-get update -y && apt-get upgrade -y
-
-RUN apt-get install -y unzip && \
-    PB_REL="https://github.com/protocolbuffers/protobuf/releases" && \
-    curl -L $PB_REL/download/v3.15.8/protoc-3.15.8-linux-x86_64.zip -o protoc.zip && \
-    unzip protoc.zip -d /usr && \
-    chmod +x /usr/bin/protoc
-
-RUN apt-get install -y cmake clang-3.9
-
-ENV PROTOC=/usr/bin/protoc
diff --git a/scripts/local_testnet/clean.sh b/scripts/local_testnet/clean.sh
index 6db8753d02..cd915e470d 100755
--- a/scripts/local_testnet/clean.sh
+++ b/scripts/local_testnet/clean.sh
@@ -9,5 +9,5 @@ set -Eeuo pipefail
 source ./vars.env
 
 if [ -d $DATADIR ]; then
-  rm -r $DATADIR
+  rm -rf $DATADIR
 fi
diff --git a/scripts/local_testnet/start_local_testnet.sh b/scripts/local_testnet/start_local_testnet.sh
index 64111d5627..4b8357b993 100755
--- a/scripts/local_testnet/start_local_testnet.sh
+++ b/scripts/local_testnet/start_local_testnet.sh
@@ -103,7 +103,7 @@ echo "executing: ./setup.sh >> $LOG_DIR/setup.log"
 ./setup.sh >> $LOG_DIR/setup.log 2>&1
 
 # Update future hardforks time in the EL genesis file based on the CL genesis time
-GENESIS_TIME=$(lcli pretty-ssz state_merge $TESTNET_DIR/genesis.ssz  | jq | grep -Po 'genesis_time": "\K.*\d')
+GENESIS_TIME=$(lcli pretty-ssz --testnet-dir $TESTNET_DIR BeaconState $TESTNET_DIR/genesis.ssz | jq | grep -Po 'genesis_time": "\K.*\d')
 echo $GENESIS_TIME
 CAPELLA_TIME=$((GENESIS_TIME + (CAPELLA_FORK_EPOCH * 32 * SECONDS_PER_SLOT)))
 echo $CAPELLA_TIME
diff --git a/slasher/tests/backend.rs b/slasher/tests/backend.rs
index 9e68107de7..fd1a6ae14f 100644
--- a/slasher/tests/backend.rs
+++ b/slasher/tests/backend.rs
@@ -1,4 +1,4 @@
-#![cfg(all(feature = "lmdb"))]
+#![cfg(feature = "lmdb")]
 
 use slasher::{config::MDBX_DATA_FILENAME, Config, DatabaseBackend, DatabaseBackendOverride};
 use std::fs::File;
diff --git a/testing/antithesis/Dockerfile.libvoidstar b/testing/antithesis/Dockerfile.libvoidstar
deleted file mode 100644
index ddc49e13cd..0000000000
--- a/testing/antithesis/Dockerfile.libvoidstar
+++ /dev/null
@@ -1,25 +0,0 @@
-FROM rust:1.68.2-bullseye AS builder
-RUN apt-get update && apt-get -y upgrade && apt-get install -y cmake libclang-dev protobuf-compiler
-COPY . lighthouse
-
-# Build lighthouse directly with a cargo build command, bypassing the Makefile.
-RUN cd lighthouse && LD_LIBRARY_PATH=/lighthouse/testing/antithesis/libvoidstar/ RUSTFLAGS="-Cpasses=sancov-module -Cllvm-args=-sanitizer-coverage-level=3 -Cllvm-args=-sanitizer-coverage-trace-pc-guard -Ccodegen-units=1 -Cdebuginfo=2 -L/lighthouse/testing/antithesis/libvoidstar/ -lvoidstar" cargo build --release --manifest-path lighthouse/Cargo.toml --target x86_64-unknown-linux-gnu --features modern --verbose --bin lighthouse
-# build lcli binary directly with cargo install command, bypassing the makefile
-RUN cargo install --path /lighthouse/lcli --force --locked
-
-FROM ubuntu:latest
-RUN apt-get update && apt-get -y upgrade && apt-get install -y --no-install-recommends \
-  libssl-dev \
-  ca-certificates \
-  && apt-get clean \
-  && rm -rf /var/lib/apt/lists/*
-
-# create and move the libvoidstar file
-RUN mkdir libvoidstar
-COPY --from=builder /lighthouse/testing/antithesis/libvoidstar/libvoidstar.so /usr/lib/libvoidstar.so
-
-# set the env variable to avoid having to always set it
-ENV LD_LIBRARY_PATH=/usr/lib
-# move the lighthouse binary and lcli binary
-COPY --from=builder /lighthouse/target/x86_64-unknown-linux-gnu/release/lighthouse /usr/local/bin/lighthouse
-COPY --from=builder  /lighthouse/target/release/lcli /usr/local/bin/lcli
diff --git a/testing/antithesis/libvoidstar/libvoidstar.so b/testing/antithesis/libvoidstar/libvoidstar.so
deleted file mode 100644
index 0f8a0f23c3..0000000000
Binary files a/testing/antithesis/libvoidstar/libvoidstar.so and /dev/null differ
diff --git a/testing/ef_tests/Makefile b/testing/ef_tests/Makefile
index f7562f477a..81a1739eb1 100644
--- a/testing/ef_tests/Makefile
+++ b/testing/ef_tests/Makefile
@@ -13,7 +13,7 @@ BLS_TARBALL = $(patsubst %,%-$(BLS_TEST_TAG).tar.gz,$(BLS_TEST))
 BLS_OUTPUT_DIR := $(OUTPUT_DIR)/$(BLS_TEST_REPO_NAME)
 BLS_BASE_URL := https://github.com/ethereum/$(BLS_TEST_REPO_NAME)/releases/download/$(BLS_TEST_TAG)
 
-WGET := $(if $(LIGHTHOUSE_GITHUB_TOKEN),wget --header="Authorization: $(LIGHTHOUSE_GITHUB_TOKEN)",wget)
+CURL := $(if $(LIGHTHOUSE_GITHUB_TOKEN),curl -L --header "Authorization: $(LIGHTHOUSE_GITHUB_TOKEN)",curl -L)
 
 all:
 	make $(OUTPUT_DIR)
@@ -27,11 +27,11 @@ $(OUTPUT_DIR): $(TARBALLS)
 
 $(BLS_OUTPUT_DIR):
 	mkdir $(BLS_OUTPUT_DIR)
-	$(WGET) $(BLS_BASE_URL)/$(BLS_TEST).tar.gz -O $(BLS_TARBALL)
+	$(CURL) $(BLS_BASE_URL)/$(BLS_TEST).tar.gz -o $(BLS_TARBALL)
 	tar -xzf $(BLS_TARBALL) -C $(BLS_OUTPUT_DIR)
 
 %-$(TESTS_TAG).tar.gz:
-	$(WGET) $(BASE_URL)/$*.tar.gz -O $@
+	$(CURL) $(BASE_URL)/$*.tar.gz -o $@
 
 clean-test-files:
 	rm -rf $(OUTPUT_DIR) $(BLS_OUTPUT_DIR)
diff --git a/testing/ef_tests/src/cases/epoch_processing.rs b/testing/ef_tests/src/cases/epoch_processing.rs
index 31542ba447..5e71187156 100644
--- a/testing/ef_tests/src/cases/epoch_processing.rs
+++ b/testing/ef_tests/src/cases/epoch_processing.rs
@@ -120,7 +120,7 @@ impl<E: EthSpec> EpochTransition<E> for RewardsAndPenalties {
             BeaconState::Base(_) => {
                 let mut validator_statuses = base::ValidatorStatuses::new(state, spec)?;
                 validator_statuses.process_attestations(state)?;
-                base::process_rewards_and_penalties(state, &mut validator_statuses, spec)
+                base::process_rewards_and_penalties(state, &validator_statuses, spec)
             }
             BeaconState::Altair(_) | BeaconState::Merge(_) | BeaconState::Capella(_) => {
                 altair::process_rewards_and_penalties(
diff --git a/testing/ef_tests/src/cases/fork_choice.rs b/testing/ef_tests/src/cases/fork_choice.rs
index 9627d2cde0..c4f288a8aa 100644
--- a/testing/ef_tests/src/cases/fork_choice.rs
+++ b/testing/ef_tests/src/cases/fork_choice.rs
@@ -7,7 +7,7 @@ use beacon_chain::{
         obtain_indexed_attestation_and_committees_per_slot, VerifiedAttestation,
     },
     test_utils::{BeaconChainHarness, EphemeralHarnessType},
-    BeaconChainTypes, CachedHead, NotifyExecutionLayer,
+    BeaconChainTypes, CachedHead, ChainConfig, NotifyExecutionLayer,
 };
 use execution_layer::{json_structures::JsonPayloadStatusV1Status, PayloadStatusV1};
 use serde::Deserialize;
@@ -303,6 +303,10 @@ impl<E: EthSpec> Tester<E> {
         let harness = BeaconChainHarness::builder(E::default())
             .spec(spec.clone())
             .keypairs(vec![])
+            .chain_config(ChainConfig {
+                reconstruct_historic_states: true,
+                ..ChainConfig::default()
+            })
             .genesis_state_ephemeral_store(case.anchor_state.clone())
             .mock_execution_layer()
             .recalculate_fork_times_with_genesis(0)
diff --git a/testing/ef_tests/src/cases/rewards.rs b/testing/ef_tests/src/cases/rewards.rs
index c59ceabe0b..ee0fc265e1 100644
--- a/testing/ef_tests/src/cases/rewards.rs
+++ b/testing/ef_tests/src/cases/rewards.rs
@@ -118,7 +118,7 @@ impl<E: EthSpec> Case for RewardsTest<E> {
                 let mut validator_statuses = ValidatorStatuses::new(&state, spec)?;
                 validator_statuses.process_attestations(&state)?;
 
-                let deltas = base::rewards_and_penalties::get_attestation_deltas(
+                let deltas = base::rewards_and_penalties::get_attestation_deltas_all(
                     &state,
                     &validator_statuses,
                     spec,
diff --git a/testing/execution_engine_integration/src/test_rig.rs b/testing/execution_engine_integration/src/test_rig.rs
index 726019a848..654b8628b8 100644
--- a/testing/execution_engine_integration/src/test_rig.rs
+++ b/testing/execution_engine_integration/src/test_rig.rs
@@ -204,16 +204,6 @@ impl<E: GenericExecutionEngine> TestRig<E> {
         let account1 = ethers_core::types::Address::from_slice(&hex::decode(ACCOUNT1).unwrap());
         let account2 = ethers_core::types::Address::from_slice(&hex::decode(ACCOUNT2).unwrap());
 
-        /*
-         * Check the transition config endpoint.
-         */
-        for ee in [&self.ee_a, &self.ee_b] {
-            ee.execution_layer
-                .exchange_transition_configuration(&self.spec)
-                .await
-                .unwrap();
-        }
-
         /*
          * Read the terminal block hash from both pairs, check it's equal.
          */
diff --git a/testing/node_test_rig/Cargo.toml b/testing/node_test_rig/Cargo.toml
index ea5d005c16..ac77349c58 100644
--- a/testing/node_test_rig/Cargo.toml
+++ b/testing/node_test_rig/Cargo.toml
@@ -14,3 +14,4 @@ validator_client = { path = "../../validator_client" }
 validator_dir = { path = "../../common/validator_dir", features = ["insecure_keys"] }
 sensitive_url = { path = "../../common/sensitive_url" }
 execution_layer = { path = "../../beacon_node/execution_layer" }
+tokio = { version = "1.14.0", features = ["time"] }
diff --git a/testing/node_test_rig/src/lib.rs b/testing/node_test_rig/src/lib.rs
index d4fd115bec..3cd8205eb6 100644
--- a/testing/node_test_rig/src/lib.rs
+++ b/testing/node_test_rig/src/lib.rs
@@ -10,6 +10,7 @@ use std::path::PathBuf;
 use std::time::Duration;
 use std::time::{SystemTime, UNIX_EPOCH};
 use tempfile::{Builder as TempBuilder, TempDir};
+use tokio::time::timeout;
 use types::EthSpec;
 use validator_client::ProductionValidatorClient;
 use validator_dir::insecure_keys::build_deterministic_validator_dirs;
@@ -23,7 +24,9 @@ pub use execution_layer::test_utils::{
 pub use validator_client::Config as ValidatorConfig;
 
 /// The global timeout for HTTP requests to the beacon node.
-const HTTP_TIMEOUT: Duration = Duration::from_secs(4);
+const HTTP_TIMEOUT: Duration = Duration::from_secs(8);
+/// The timeout for a beacon node to start up.
+const STARTUP_TIMEOUT: Duration = Duration::from_secs(60);
 
 /// Provides a beacon node that is running in the current process on a given tokio executor (it
 /// is _local_ to this process).
@@ -51,12 +54,16 @@ impl<E: EthSpec> LocalBeaconNode<E> {
         client_config.set_data_dir(datadir.path().into());
         client_config.network.network_dir = PathBuf::from(datadir.path()).join("network");
 
-        ProductionBeaconNode::new(context, client_config)
-            .await
-            .map(move |client| Self {
-                client: client.into_inner(),
-                datadir,
-            })
+        timeout(
+            STARTUP_TIMEOUT,
+            ProductionBeaconNode::new(context, client_config),
+        )
+        .await
+        .map_err(|_| format!("Beacon node startup timed out after {:?}", STARTUP_TIMEOUT))?
+        .map(move |client| Self {
+            client: client.into_inner(),
+            datadir,
+        })
     }
 }
 
@@ -108,6 +115,14 @@ pub fn testing_client_config() -> ClientConfig {
         genesis_time: now,
     };
 
+    // Simulator tests expect historic states to be available for post-run checks.
+    client_config.chain.reconstruct_historic_states = true;
+
+    // Specify a constant count of beacon processor workers. Having this number
+    // too low can cause annoying HTTP timeouts, especially on Github runners
+    // with 2 logical CPUs.
+    client_config.beacon_processor.max_workers = 4;
+
     client_config
 }
 
diff --git a/testing/simulator/src/cli.rs b/testing/simulator/src/cli.rs
index 5dc2d5ec84..ff80201051 100644
--- a/testing/simulator/src/cli.rs
+++ b/testing/simulator/src/cli.rs
@@ -25,8 +25,8 @@ pub fn cli_app<'a, 'b>() -> App<'a, 'b> {
                         .default_value("4")
                         .help("Number of beacon nodes"))
                     .arg(Arg::with_name("proposer-nodes")
-                        .short("n")
-                        .long("nodes")
+                        .short("p")
+                        .long("proposer_nodes")
                         .takes_value(true)
                         .default_value("2")
                         .help("Number of proposer-only beacon nodes"))
@@ -64,8 +64,8 @@ pub fn cli_app<'a, 'b>() -> App<'a, 'b> {
                         .default_value("4")
                         .help("Number of beacon nodes"))
                     .arg(Arg::with_name("proposer-nodes")
-                        .short("n")
-                        .long("nodes")
+                        .short("p")
+                        .long("proposer_nodes")
                         .takes_value(true)
                         .default_value("2")
                         .help("Number of proposer-only beacon nodes"))
diff --git a/testing/simulator/src/eth1_sim.rs b/testing/simulator/src/eth1_sim.rs
index 3e764d27d0..57c944cf1a 100644
--- a/testing/simulator/src/eth1_sim.rs
+++ b/testing/simulator/src/eth1_sim.rs
@@ -1,14 +1,16 @@
 use crate::local_network::{EXECUTION_PORT, TERMINAL_BLOCK, TERMINAL_DIFFICULTY};
-use crate::{checks, LocalNetwork, E};
+use crate::{checks, LocalNetwork};
 use clap::ArgMatches;
 use eth1::{Eth1Endpoint, DEFAULT_CHAIN_ID};
 use eth1_test_rig::AnvilEth1Instance;
 
+use crate::retry::with_retry;
 use execution_layer::http::deposit_methods::Eth1Id;
 use futures::prelude::*;
+use node_test_rig::environment::RuntimeContext;
 use node_test_rig::{
     environment::{EnvironmentBuilder, LoggerConfig},
-    testing_client_config, testing_validator_config, ClientGenesis, ValidatorFiles,
+    testing_client_config, testing_validator_config, ClientConfig, ClientGenesis, ValidatorFiles,
 };
 use rayon::prelude::*;
 use sensitive_url::SensitiveUrl;
@@ -107,71 +109,24 @@ pub fn run_eth1_sim(matches: &ArgMatches) -> Result<(), String> {
     let context = env.core_context();
 
     let main_future = async {
-        /*
-         * Deploy the deposit contract, spawn tasks to keep creating new blocks and deposit
-         * validators.
-         */
-        let anvil_eth1_instance = AnvilEth1Instance::new(DEFAULT_CHAIN_ID.into()).await?;
-        let deposit_contract = anvil_eth1_instance.deposit_contract;
-        let chain_id = anvil_eth1_instance.anvil.chain_id();
-        let anvil = anvil_eth1_instance.anvil;
-        let eth1_endpoint = SensitiveUrl::parse(anvil.endpoint().as_str())
-            .expect("Unable to parse anvil endpoint.");
-        let deposit_contract_address = deposit_contract.address();
-
-        // Start a timer that produces eth1 blocks on an interval.
-        tokio::spawn(async move {
-            let mut interval = tokio::time::interval(eth1_block_time);
-            loop {
-                interval.tick().await;
-                let _ = anvil.evm_mine().await;
-            }
-        });
-
-        // Submit deposits to the deposit contract.
-        tokio::spawn(async move {
-            for i in 0..total_validator_count {
-                println!("Submitting deposit for validator {}...", i);
-                let _ = deposit_contract
-                    .deposit_deterministic_async::<E>(i, deposit_amount)
-                    .await;
-            }
-        });
-
-        let mut beacon_config = testing_client_config();
-
-        beacon_config.genesis = ClientGenesis::DepositContract;
-        beacon_config.eth1.endpoint = Eth1Endpoint::NoAuth(eth1_endpoint);
-        beacon_config.eth1.deposit_contract_address = deposit_contract_address;
-        beacon_config.eth1.deposit_contract_deploy_block = 0;
-        beacon_config.eth1.lowest_cached_block_number = 0;
-        beacon_config.eth1.follow_distance = 1;
-        beacon_config.eth1.node_far_behind_seconds = 20;
-        beacon_config.dummy_eth1_backend = false;
-        beacon_config.sync_eth1_chain = true;
-        beacon_config.eth1.auto_update_interval_millis = eth1_block_time.as_millis() as u64;
-        beacon_config.eth1.chain_id = Eth1Id::from(chain_id);
-        beacon_config.network.target_peers = node_count + proposer_nodes - 1;
-
-        beacon_config.network.enr_address = (Some(Ipv4Addr::LOCALHOST), None);
-
-        if post_merge_sim {
-            let el_config = execution_layer::Config {
-                execution_endpoints: vec![SensitiveUrl::parse(&format!(
-                    "http://localhost:{}",
-                    EXECUTION_PORT
-                ))
-                .unwrap()],
-                ..Default::default()
-            };
-
-            beacon_config.execution_layer = Some(el_config);
-        }
-
         /*
          * Create a new `LocalNetwork` with one beacon node.
          */
-        let network = LocalNetwork::new(context.clone(), beacon_config.clone()).await?;
+        let max_retries = 3;
+        let (network, beacon_config) = with_retry(max_retries, || {
+            Box::pin(create_local_network(
+                LocalNetworkParams {
+                    eth1_block_time,
+                    total_validator_count,
+                    deposit_amount,
+                    node_count,
+                    proposer_nodes,
+                    post_merge_sim,
+                },
+                context.clone(),
+            ))
+        })
+        .await?;
 
         /*
          * One by one, add beacon nodes to the network.
@@ -341,3 +296,88 @@ pub fn run_eth1_sim(matches: &ArgMatches) -> Result<(), String> {
 
     Ok(())
 }
+
+struct LocalNetworkParams {
+    eth1_block_time: Duration,
+    total_validator_count: usize,
+    deposit_amount: u64,
+    node_count: usize,
+    proposer_nodes: usize,
+    post_merge_sim: bool,
+}
+
+async fn create_local_network<E: EthSpec>(
+    LocalNetworkParams {
+        eth1_block_time,
+        total_validator_count,
+        deposit_amount,
+        node_count,
+        proposer_nodes,
+        post_merge_sim,
+    }: LocalNetworkParams,
+    context: RuntimeContext<E>,
+) -> Result<(LocalNetwork<E>, ClientConfig), String> {
+    /*
+     * Deploy the deposit contract, spawn tasks to keep creating new blocks and deposit
+     * validators.
+     */
+    let anvil_eth1_instance = AnvilEth1Instance::new(DEFAULT_CHAIN_ID.into()).await?;
+    let deposit_contract = anvil_eth1_instance.deposit_contract;
+    let chain_id = anvil_eth1_instance.anvil.chain_id();
+    let anvil = anvil_eth1_instance.anvil;
+    let eth1_endpoint =
+        SensitiveUrl::parse(anvil.endpoint().as_str()).expect("Unable to parse anvil endpoint.");
+    let deposit_contract_address = deposit_contract.address();
+
+    // Start a timer that produces eth1 blocks on an interval.
+    tokio::spawn(async move {
+        let mut interval = tokio::time::interval(eth1_block_time);
+        loop {
+            interval.tick().await;
+            let _ = anvil.evm_mine().await;
+        }
+    });
+
+    // Submit deposits to the deposit contract.
+    tokio::spawn(async move {
+        for i in 0..total_validator_count {
+            println!("Submitting deposit for validator {}...", i);
+            let _ = deposit_contract
+                .deposit_deterministic_async::<E>(i, deposit_amount)
+                .await;
+        }
+    });
+
+    let mut beacon_config = testing_client_config();
+
+    beacon_config.genesis = ClientGenesis::DepositContract;
+    beacon_config.eth1.endpoint = Eth1Endpoint::NoAuth(eth1_endpoint);
+    beacon_config.eth1.deposit_contract_address = deposit_contract_address;
+    beacon_config.eth1.deposit_contract_deploy_block = 0;
+    beacon_config.eth1.lowest_cached_block_number = 0;
+    beacon_config.eth1.follow_distance = 1;
+    beacon_config.eth1.node_far_behind_seconds = 20;
+    beacon_config.dummy_eth1_backend = false;
+    beacon_config.sync_eth1_chain = true;
+    beacon_config.eth1.auto_update_interval_millis = eth1_block_time.as_millis() as u64;
+    beacon_config.eth1.chain_id = Eth1Id::from(chain_id);
+    beacon_config.network.target_peers = node_count + proposer_nodes - 1;
+
+    beacon_config.network.enr_address = (Some(Ipv4Addr::LOCALHOST), None);
+
+    if post_merge_sim {
+        let el_config = execution_layer::Config {
+            execution_endpoints: vec![SensitiveUrl::parse(&format!(
+                "http://localhost:{}",
+                EXECUTION_PORT
+            ))
+            .unwrap()],
+            ..Default::default()
+        };
+
+        beacon_config.execution_layer = Some(el_config);
+    }
+
+    let network = LocalNetwork::new(context, beacon_config.clone()).await?;
+    Ok((network, beacon_config))
+}
diff --git a/testing/simulator/src/main.rs b/testing/simulator/src/main.rs
index a19777c5ab..e8af9c1806 100644
--- a/testing/simulator/src/main.rs
+++ b/testing/simulator/src/main.rs
@@ -21,6 +21,7 @@ mod cli;
 mod eth1_sim;
 mod local_network;
 mod no_eth1_sim;
+mod retry;
 mod sync_sim;
 
 use cli::cli_app;
diff --git a/testing/simulator/src/retry.rs b/testing/simulator/src/retry.rs
new file mode 100644
index 0000000000..a4eb52cea1
--- /dev/null
+++ b/testing/simulator/src/retry.rs
@@ -0,0 +1,63 @@
+use std::fmt::Debug;
+use std::future::Future;
+use std::pin::Pin;
+
+/// Executes the function with a specified number of retries if the function returns an error.
+/// Once it exceeds `max_retries` and still fails, the error is returned.
+pub async fn with_retry<T, E, F>(max_retries: usize, mut func: F) -> Result<T, E>
+where
+    F: FnMut() -> Pin<Box<dyn Future<Output = Result<T, E>>>>,
+    E: Debug,
+{
+    let mut retry_count = 0;
+    loop {
+        let result = Box::pin(func()).await;
+        if result.is_ok() || retry_count >= max_retries {
+            break result;
+        }
+        retry_count += 1;
+
+        if let Err(e) = result {
+            eprintln!(
+                "Operation failed with error {:?}, retrying {} of {}",
+                e, retry_count, max_retries
+            );
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use std::collections::VecDeque;
+
+    async fn my_async_func(is_ok: bool) -> Result<(), ()> {
+        if is_ok {
+            Ok(())
+        } else {
+            Err(())
+        }
+    }
+
+    #[tokio::test]
+    async fn test_with_retry_ok() {
+        let res = with_retry(3, || Box::pin(my_async_func(true))).await;
+        assert!(res.is_ok());
+    }
+
+    #[tokio::test]
+    async fn test_with_retry_2nd_ok() {
+        let mut mock_results = VecDeque::from([false, true]);
+        let res = with_retry(3, || {
+            Box::pin(my_async_func(mock_results.pop_front().unwrap()))
+        })
+        .await;
+        assert!(res.is_ok());
+    }
+
+    #[tokio::test]
+    async fn test_with_retry_fail() {
+        let res = with_retry(3, || Box::pin(my_async_func(false))).await;
+        assert!(res.is_err());
+    }
+}
diff --git a/testing/web3signer_tests/Cargo.toml b/testing/web3signer_tests/Cargo.toml
index c0fbf66723..faad76a19c 100644
--- a/testing/web3signer_tests/Cargo.toml
+++ b/testing/web3signer_tests/Cargo.toml
@@ -26,6 +26,6 @@ serde_derive = "1.0.116"
 serde_yaml = "0.8.13"
 eth2_network_config = { path = "../../common/eth2_network_config" }
 serde_json = "1.0.58"
-zip = "0.5.13"
+zip = "0.6"
 lazy_static = "1.4.0"
-parking_lot = "0.12.0"
\ No newline at end of file
+parking_lot = "0.12.0"
diff --git a/testing/web3signer_tests/src/lib.rs b/testing/web3signer_tests/src/lib.rs
index dd17ae23b1..463de0c8b3 100644
--- a/testing/web3signer_tests/src/lib.rs
+++ b/testing/web3signer_tests/src/lib.rs
@@ -51,7 +51,7 @@ mod tests {
 
     /// If the we are unable to reach the Web3Signer HTTP API within this time out then we will
     /// assume it failed to start.
-    const UPCHECK_TIMEOUT: Duration = Duration::from_secs(20);
+    const UPCHECK_TIMEOUT: Duration = Duration::from_secs(30);
 
     /// Set to `false` to send the Web3Signer logs to the console during tests. Logs are useful when
     /// debugging.
diff --git a/validator_client/Cargo.toml b/validator_client/Cargo.toml
index 494ebcb3df..200db73167 100644
--- a/validator_client/Cargo.toml
+++ b/validator_client/Cargo.toml
@@ -10,7 +10,6 @@ path = "src/lib.rs"
 
 [dev-dependencies]
 tokio = { version = "1.14.0", features = ["time", "rt-multi-thread", "macros"] }
-logging = { path = "../common/logging" }
 
 [dependencies]
 tree_hash = "0.5.0"
@@ -63,4 +62,3 @@ malloc_utils = { path = "../common/malloc_utils" }
 sysinfo = "0.26.5"
 system_health = { path = "../common/system_health" }
 logging = { path = "../common/logging" }
-
diff --git a/validator_client/slashing_protection/src/slashing_database.rs b/validator_client/slashing_protection/src/slashing_database.rs
index c8be851472..406913bfd1 100644
--- a/validator_client/slashing_protection/src/slashing_database.rs
+++ b/validator_client/slashing_protection/src/slashing_database.rs
@@ -23,7 +23,7 @@ pub const POOL_SIZE: u32 = 1;
 #[cfg(not(test))]
 pub const CONNECTION_TIMEOUT: Duration = Duration::from_secs(5);
 #[cfg(test)]
-pub const CONNECTION_TIMEOUT: Duration = Duration::from_millis(100);
+pub const CONNECTION_TIMEOUT: Duration = Duration::from_millis(500);
 
 /// Supported version of the interchange format.
 pub const SUPPORTED_INTERCHANGE_FORMAT_VERSION: u64 = 5;
diff --git a/validator_client/src/attestation_service.rs b/validator_client/src/attestation_service.rs
index a7118aa945..f0a9258c74 100644
--- a/validator_client/src/attestation_service.rs
+++ b/validator_client/src/attestation_service.rs
@@ -2,12 +2,12 @@ use crate::beacon_node_fallback::{BeaconNodeFallback, RequireSynced};
 use crate::{
     duties_service::{DutiesService, DutyAndProof},
     http_metrics::metrics,
-    validator_store::ValidatorStore,
+    validator_store::{Error as ValidatorStoreError, ValidatorStore},
     OfflineOnFailure,
 };
 use environment::RuntimeContext;
 use futures::future::join_all;
-use slog::{crit, error, info, trace};
+use slog::{crit, debug, error, info, trace, warn};
 use slot_clock::SlotClock;
 use std::collections::HashMap;
 use std::ops::Deref;
@@ -395,6 +395,20 @@ impl<T: SlotClock + 'static, E: EthSpec> AttestationService<T, E> {
                 .await
             {
                 Ok(()) => Some((attestation, duty.validator_index)),
+                Err(ValidatorStoreError::UnknownPubkey(pubkey)) => {
+                    // A pubkey can be missing when a validator was recently
+                    // removed via the API.
+                    warn!(
+                        log,
+                        "Missing pubkey for attestation";
+                        "info" => "a validator may have recently been removed from this VC",
+                        "pubkey" => ?pubkey,
+                        "validator" => ?duty.pubkey,
+                        "committee_index" => committee_index,
+                        "slot" => slot.as_u64(),
+                    );
+                    None
+                }
                 Err(e) => {
                     crit!(
                         log,
@@ -527,10 +541,20 @@ impl<T: SlotClock + 'static, E: EthSpec> AttestationService<T, E> {
                 .await
             {
                 Ok(aggregate) => Some(aggregate),
+                Err(ValidatorStoreError::UnknownPubkey(pubkey)) => {
+                    // A pubkey can be missing when a validator was recently
+                    // removed via the API.
+                    debug!(
+                        log,
+                        "Missing pubkey for aggregate";
+                        "pubkey" => ?pubkey,
+                    );
+                    None
+                }
                 Err(e) => {
                     crit!(
                         log,
-                        "Failed to sign attestation";
+                        "Failed to sign aggregate";
                         "error" => ?e,
                         "pubkey" => ?duty.pubkey,
                     );
diff --git a/validator_client/src/block_service.rs b/validator_client/src/block_service.rs
index d22e6c95f3..094b85bf81 100644
--- a/validator_client/src/block_service.rs
+++ b/validator_client/src/block_service.rs
@@ -5,9 +5,13 @@ use crate::{
     graffiti_file::GraffitiFile,
     OfflineOnFailure,
 };
-use crate::{http_metrics::metrics, validator_store::ValidatorStore};
+use crate::{
+    http_metrics::metrics,
+    validator_store::{Error as ValidatorStoreError, ValidatorStore},
+};
 use environment::RuntimeContext;
-use eth2::BeaconNodeHttpClient;
+use eth2::{BeaconNodeHttpClient, StatusCode};
+use slog::Logger;
 use slog::{crit, debug, error, info, trace, warn};
 use slot_clock::SlotClock;
 use std::fmt::Debug;
@@ -417,17 +421,31 @@ impl<T: SlotClock + 'static, E: EthSpec> BlockService<T, E> {
             BlockError::Recoverable("Unable to determine current slot from clock".to_string())
         })?;
 
-        let randao_reveal = self
+        let randao_reveal = match self
             .validator_store
             .randao_reveal(validator_pubkey, slot.epoch(E::slots_per_epoch()))
             .await
-            .map_err(|e| {
-                BlockError::Recoverable(format!(
+        {
+            Ok(signature) => signature.into(),
+            Err(ValidatorStoreError::UnknownPubkey(pubkey)) => {
+                // A pubkey can be missing when a validator was recently removed
+                // via the API.
+                warn!(
+                    log,
+                    "Missing pubkey for block randao";
+                    "info" => "a validator may have recently been removed from this VC",
+                    "pubkey" => ?pubkey,
+                    "slot" => ?slot
+                );
+                return Ok(());
+            }
+            Err(e) => {
+                return Err(BlockError::Recoverable(format!(
                     "Unable to produce randao reveal signature: {:?}",
                     e
-                ))
-            })?
-            .into();
+                )))
+            }
+        };
 
         let graffiti = determine_graffiti(
             &validator_pubkey,
@@ -522,11 +540,31 @@ impl<T: SlotClock + 'static, E: EthSpec> BlockService<T, E> {
             .await?;
 
         let signing_timer = metrics::start_timer(&metrics::BLOCK_SIGNING_TIMES);
-        let signed_block = self_ref
+        let signed_block = match self_ref
             .validator_store
             .sign_block::<Payload>(*validator_pubkey_ref, block, current_slot)
             .await
-            .map_err(|e| BlockError::Recoverable(format!("Unable to sign block: {:?}", e)))?;
+        {
+            Ok(block) => block,
+            Err(ValidatorStoreError::UnknownPubkey(pubkey)) => {
+                // A pubkey can be missing when a validator was recently removed
+                // via the API.
+                warn!(
+                    log,
+                    "Missing pubkey for block";
+                    "info" => "a validator may have recently been removed from this VC",
+                    "pubkey" => ?pubkey,
+                    "slot" => ?slot
+                );
+                return Ok(());
+            }
+            Err(e) => {
+                return Err(BlockError::Recoverable(format!(
+                    "Unable to sign block: {:?}",
+                    e
+                )))
+            }
+        };
         let signing_time_ms =
             Duration::from_secs_f64(signing_timer.map_or(0.0, |t| t.stop_and_record())).as_millis();
 
@@ -556,12 +594,7 @@ impl<T: SlotClock + 'static, E: EthSpec> BlockService<T, E> {
                             beacon_node
                                 .post_beacon_blocks(&signed_block)
                                 .await
-                                .map_err(|e| {
-                                    BlockError::Irrecoverable(format!(
-                                        "Error from beacon node when publishing block: {:?}",
-                                        e
-                                    ))
-                                })?
+                                .or_else(|e| handle_block_post_error(e, slot, log))?
                         }
                         BlockType::Blinded => {
                             let _post_timer = metrics::start_timer_vec(
@@ -571,12 +604,7 @@ impl<T: SlotClock + 'static, E: EthSpec> BlockService<T, E> {
                             beacon_node
                                 .post_beacon_blinded_blocks(&signed_block)
                                 .await
-                                .map_err(|e| {
-                                    BlockError::Irrecoverable(format!(
-                                        "Error from beacon node when publishing block: {:?}",
-                                        e
-                                    ))
-                                })?
+                                .or_else(|e| handle_block_post_error(e, slot, log))?
                         }
                     }
                     Ok::<_, BlockError>(())
@@ -597,3 +625,29 @@ impl<T: SlotClock + 'static, E: EthSpec> BlockService<T, E> {
         Ok(())
     }
 }
+
+fn handle_block_post_error(err: eth2::Error, slot: Slot, log: &Logger) -> Result<(), BlockError> {
+    // Handle non-200 success codes.
+    if let Some(status) = err.status() {
+        if status == StatusCode::ACCEPTED {
+            info!(
+                log,
+                "Block is already known to BN or might be invalid";
+                "slot" => slot,
+                "status_code" => status.as_u16(),
+            );
+            return Ok(());
+        } else if status.is_success() {
+            debug!(
+                log,
+                "Block published with non-standard success code";
+                "slot" => slot,
+                "status_code" => status.as_u16(),
+            );
+            return Ok(());
+        }
+    }
+    Err(BlockError::Irrecoverable(format!(
+        "Error from beacon node when publishing block: {err:?}",
+    )))
+}
diff --git a/validator_client/src/cli.rs b/validator_client/src/cli.rs
index 436b8eb4d5..0789ac78a0 100644
--- a/validator_client/src/cli.rs
+++ b/validator_client/src/cli.rs
@@ -204,6 +204,26 @@ pub fn cli_app<'a, 'b>() -> App<'a, 'b> {
                     address of this server (e.g., http://localhost:5062).")
                 .takes_value(true),
         )
+        .arg(
+            Arg::with_name("http-allow-keystore-export")
+                .long("http-allow-keystore-export")
+                .help("If present, allow access to the DELETE /lighthouse/keystores HTTP \
+                    API method, which allows exporting keystores and passwords to HTTP API \
+                    consumers who have access to the API token. This method is useful for \
+                    exporting validators, however it should be used with caution since it \
+                    exposes private key data to authorized users.")
+                .required(false)
+                .takes_value(false),
+        )
+        .arg(
+            Arg::with_name("http-store-passwords-in-secrets-dir")
+                .long("http-store-passwords-in-secrets-dir")
+                .help("If present, any validators created via the HTTP will have keystore \
+                    passwords stored in the secrets-dir rather than the validator \
+                    definitions file.")
+                .required(false)
+                .takes_value(false),
+        )
         /* Prometheus metrics HTTP server related arguments */
         .arg(
             Arg::with_name("metrics")
diff --git a/validator_client/src/config.rs b/validator_client/src/config.rs
index e0dd12e100..7c662db937 100644
--- a/validator_client/src/config.rs
+++ b/validator_client/src/config.rs
@@ -294,6 +294,14 @@ impl Config {
             config.http_api.allow_origin = Some(allow_origin.to_string());
         }
 
+        if cli_args.is_present("http-allow-keystore-export") {
+            config.http_api.allow_keystore_export = true;
+        }
+
+        if cli_args.is_present("http-store-passwords-in-secrets-dir") {
+            config.http_api.store_passwords_in_secrets_dir = true;
+        }
+
         /*
          * Prometheus metrics HTTP server
          */
diff --git a/validator_client/src/duties_service.rs b/validator_client/src/duties_service.rs
index 83cdb936aa..a3b3cabccc 100644
--- a/validator_client/src/duties_service.rs
+++ b/validator_client/src/duties_service.rs
@@ -932,6 +932,20 @@ async fn fill_in_selection_proofs<T: SlotClock + 'static, E: EthSpec>(
             for result in duty_and_proof_results {
                 let duty_and_proof = match result {
                     Ok(duty_and_proof) => duty_and_proof,
+                    Err(Error::FailedToProduceSelectionProof(
+                        ValidatorStoreError::UnknownPubkey(pubkey),
+                    )) => {
+                        // A pubkey can be missing when a validator was recently
+                        // removed via the API.
+                        warn!(
+                            log,
+                            "Missing pubkey for duty and proof";
+                            "info" => "a validator may have recently been removed from this VC",
+                            "pubkey" => ?pubkey,
+                        );
+                        // Do not abort the entire batch for a single failure.
+                        continue;
+                    }
                     Err(e) => {
                         error!(
                             log,
@@ -1007,7 +1021,7 @@ async fn fill_in_selection_proofs<T: SlotClock + 'static, E: EthSpec>(
 /// 2. We won't miss a block if the duties for the current slot happen to change with this poll.
 ///
 /// This sounds great, but is it safe? Firstly, the additional notification will only contain block
-/// producers that were not included in the first notification. This should be safety enough.
+/// producers that were not included in the first notification. This should be safe enough.
 /// However, we also have the slashing protection as a second line of defence. These two factors
 /// provide an acceptable level of safety.
 ///
diff --git a/validator_client/src/duties_service/sync.rs b/validator_client/src/duties_service/sync.rs
index 7a852091aa..cf63d8ac62 100644
--- a/validator_client/src/duties_service/sync.rs
+++ b/validator_client/src/duties_service/sync.rs
@@ -2,7 +2,10 @@ use crate::beacon_node_fallback::{OfflineOnFailure, RequireSynced};
 use crate::{
     doppelganger_service::DoppelgangerStatus,
     duties_service::{DutiesService, Error},
+    http_metrics::metrics,
+    validator_store::Error as ValidatorStoreError,
 };
+
 use futures::future::join_all;
 use itertools::Itertools;
 use parking_lot::{MappedRwLockReadGuard, RwLock, RwLockReadGuard, RwLockWriteGuard};
@@ -425,6 +428,10 @@ pub async fn poll_sync_committee_duties_for_period<T: SlotClock + 'static, E: Et
             RequireSynced::No,
             OfflineOnFailure::Yes,
             |beacon_node| async move {
+                let _timer = metrics::start_timer_vec(
+                    &metrics::DUTIES_SERVICE_TIMES,
+                    &[metrics::VALIDATOR_DUTIES_SYNC_HTTP_POST],
+                );
                 beacon_node
                     .post_validator_duties_sync(period_start_epoch, local_indices)
                     .await
@@ -539,6 +546,18 @@ pub async fn fill_in_aggregation_proofs<T: SlotClock + 'static, E: EthSpec>(
                         .await
                     {
                         Ok(proof) => proof,
+                        Err(ValidatorStoreError::UnknownPubkey(pubkey)) => {
+                            // A pubkey can be missing when a validator was recently
+                            // removed via the API.
+                            debug!(
+                                log,
+                                "Missing pubkey for sync selection proof";
+                                "pubkey" => ?pubkey,
+                                "pubkey" => ?duty.pubkey,
+                                "slot" => slot,
+                            );
+                            return None;
+                        }
                         Err(e) => {
                             warn!(
                                 log,
diff --git a/validator_client/src/http_api/create_validator.rs b/validator_client/src/http_api/create_validator.rs
index f3107cfedb..52336afa59 100644
--- a/validator_client/src/http_api/create_validator.rs
+++ b/validator_client/src/http_api/create_validator.rs
@@ -1,15 +1,16 @@
 use crate::ValidatorStore;
-use account_utils::validator_definitions::ValidatorDefinition;
+use account_utils::validator_definitions::{PasswordStorage, ValidatorDefinition};
 use account_utils::{
+    eth2_keystore::Keystore,
     eth2_wallet::{bip39::Mnemonic, WalletBuilder},
     random_mnemonic, random_password, ZeroizeString,
 };
 use eth2::lighthouse_vc::types::{self as api_types};
 use slot_clock::SlotClock;
-use std::path::Path;
+use std::path::{Path, PathBuf};
 use types::ChainSpec;
 use types::EthSpec;
-use validator_dir::Builder as ValidatorDirBuilder;
+use validator_dir::{keystore_password_path, Builder as ValidatorDirBuilder};
 
 /// Create some validator EIP-2335 keystores and store them on disk. Then, enroll the validators in
 /// this validator client.
@@ -27,6 +28,7 @@ pub async fn create_validators_mnemonic<P: AsRef<Path>, T: 'static + SlotClock,
     key_derivation_path_offset: Option<u32>,
     validator_requests: &[api_types::ValidatorRequest],
     validator_dir: P,
+    secrets_dir: Option<PathBuf>,
     validator_store: &ValidatorStore<T, E>,
     spec: &ChainSpec,
 ) -> Result<(Vec<api_types::CreatedValidator>, Mnemonic), warp::Rejection> {
@@ -95,7 +97,11 @@ pub async fn create_validators_mnemonic<P: AsRef<Path>, T: 'static + SlotClock,
                 ))
             })?;
 
+        let voting_password_storage =
+            get_voting_password_storage(&secrets_dir, &keystores.voting, &voting_password_string)?;
+
         let validator_dir = ValidatorDirBuilder::new(validator_dir.as_ref().into())
+            .password_dir_opt(secrets_dir.clone())
             .voting_keystore(keystores.voting, voting_password.as_bytes())
             .withdrawal_keystore(keystores.withdrawal, withdrawal_password.as_bytes())
             .create_eth1_tx_data(request.deposit_gwei, spec)
@@ -136,7 +142,7 @@ pub async fn create_validators_mnemonic<P: AsRef<Path>, T: 'static + SlotClock,
         validator_store
             .add_validator_keystore(
                 voting_keystore_path,
-                voting_password_string,
+                voting_password_storage,
                 request.enable,
                 request.graffiti.clone(),
                 request.suggested_fee_recipient,
@@ -185,3 +191,26 @@ pub async fn create_validators_web3signer<T: 'static + SlotClock, E: EthSpec>(
 
     Ok(())
 }
+
+/// Attempts to return a `PasswordStorage::File` if `secrets_dir` is defined.
+/// Otherwise, returns a `PasswordStorage::ValidatorDefinitions`.
+pub fn get_voting_password_storage(
+    secrets_dir: &Option<PathBuf>,
+    voting_keystore: &Keystore,
+    voting_password_string: &ZeroizeString,
+) -> Result<PasswordStorage, warp::Rejection> {
+    if let Some(secrets_dir) = &secrets_dir {
+        let password_path = keystore_password_path(secrets_dir, voting_keystore);
+        if password_path.exists() {
+            Err(warp_utils::reject::custom_server_error(
+                "Duplicate keystore password path".to_string(),
+            ))
+        } else {
+            Ok(PasswordStorage::File(password_path))
+        }
+    } else {
+        Ok(PasswordStorage::ValidatorDefinitions(
+            voting_password_string.clone(),
+        ))
+    }
+}
diff --git a/validator_client/src/http_api/keystores.rs b/validator_client/src/http_api/keystores.rs
index b886f60435..c2d9b4d67f 100644
--- a/validator_client/src/http_api/keystores.rs
+++ b/validator_client/src/http_api/keystores.rs
@@ -3,11 +3,14 @@ use crate::{
     initialized_validators::Error, signing_method::SigningMethod, InitializedValidators,
     ValidatorStore,
 };
-use account_utils::ZeroizeString;
-use eth2::lighthouse_vc::std_types::{
-    DeleteKeystoreStatus, DeleteKeystoresRequest, DeleteKeystoresResponse, ImportKeystoreStatus,
-    ImportKeystoresRequest, ImportKeystoresResponse, InterchangeJsonStr, KeystoreJsonStr,
-    ListKeystoresResponse, SingleKeystoreResponse, Status,
+use account_utils::{validator_definitions::PasswordStorage, ZeroizeString};
+use eth2::lighthouse_vc::{
+    std_types::{
+        DeleteKeystoreStatus, DeleteKeystoresRequest, DeleteKeystoresResponse,
+        ImportKeystoreStatus, ImportKeystoresRequest, ImportKeystoresResponse, InterchangeJsonStr,
+        KeystoreJsonStr, ListKeystoresResponse, SingleKeystoreResponse, Status,
+    },
+    types::{ExportKeystoresResponse, SingleExportKeystoresResponse},
 };
 use eth2_keystore::Keystore;
 use slog::{info, warn, Logger};
@@ -17,7 +20,7 @@ use std::sync::Arc;
 use task_executor::TaskExecutor;
 use tokio::runtime::Handle;
 use types::{EthSpec, PublicKeyBytes};
-use validator_dir::Builder as ValidatorDirBuilder;
+use validator_dir::{keystore_password_path, Builder as ValidatorDirBuilder};
 use warp::Rejection;
 use warp_utils::reject::{custom_bad_request, custom_server_error};
 
@@ -58,6 +61,7 @@ pub fn list<T: SlotClock + 'static, E: EthSpec>(
 pub fn import<T: SlotClock + 'static, E: EthSpec>(
     request: ImportKeystoresRequest,
     validator_dir: PathBuf,
+    secrets_dir: Option<PathBuf>,
     validator_store: Arc<ValidatorStore<T, E>>,
     task_executor: TaskExecutor,
     log: Logger,
@@ -128,6 +132,7 @@ pub fn import<T: SlotClock + 'static, E: EthSpec>(
                 keystore,
                 password,
                 validator_dir.clone(),
+                secrets_dir.clone(),
                 &validator_store,
                 handle,
             ) {
@@ -158,6 +163,7 @@ fn import_single_keystore<T: SlotClock + 'static, E: EthSpec>(
     keystore: Keystore,
     password: ZeroizeString,
     validator_dir_path: PathBuf,
+    secrets_dir: Option<PathBuf>,
     validator_store: &ValidatorStore<T, E>,
     handle: Handle,
 ) -> Result<ImportKeystoreStatus, String> {
@@ -179,6 +185,16 @@ fn import_single_keystore<T: SlotClock + 'static, E: EthSpec>(
         }
     }
 
+    let password_storage = if let Some(secrets_dir) = &secrets_dir {
+        let password_path = keystore_password_path(secrets_dir, &keystore);
+        if password_path.exists() {
+            return Ok(ImportKeystoreStatus::Duplicate);
+        }
+        PasswordStorage::File(password_path)
+    } else {
+        PasswordStorage::ValidatorDefinitions(password.clone())
+    };
+
     // Check that the password is correct.
     // In future we should re-structure to avoid the double decryption here. It's not as simple
     // as removing this check because `add_validator_keystore` will break if provided with an
@@ -189,6 +205,7 @@ fn import_single_keystore<T: SlotClock + 'static, E: EthSpec>(
         .map_err(|e| format!("incorrect password: {:?}", e))?;
 
     let validator_dir = ValidatorDirBuilder::new(validator_dir_path)
+        .password_dir_opt(secrets_dir)
         .voting_keystore(keystore, password.as_ref())
         .store_withdrawal_keystore(false)
         .build()
@@ -201,7 +218,7 @@ fn import_single_keystore<T: SlotClock + 'static, E: EthSpec>(
     handle
         .block_on(validator_store.add_validator_keystore(
             voting_keystore_path,
-            password,
+            password_storage,
             true,
             None,
             None,
@@ -219,11 +236,28 @@ pub fn delete<T: SlotClock + 'static, E: EthSpec>(
     task_executor: TaskExecutor,
     log: Logger,
 ) -> Result<DeleteKeystoresResponse, Rejection> {
+    let export_response = export(request, validator_store, task_executor, log)?;
+    Ok(DeleteKeystoresResponse {
+        data: export_response
+            .data
+            .into_iter()
+            .map(|response| response.status)
+            .collect(),
+        slashing_protection: export_response.slashing_protection,
+    })
+}
+
+pub fn export<T: SlotClock + 'static, E: EthSpec>(
+    request: DeleteKeystoresRequest,
+    validator_store: Arc<ValidatorStore<T, E>>,
+    task_executor: TaskExecutor,
+    log: Logger,
+) -> Result<ExportKeystoresResponse, Rejection> {
     // Remove from initialized validators.
     let initialized_validators_rwlock = validator_store.initialized_validators();
     let mut initialized_validators = initialized_validators_rwlock.write();
 
-    let mut statuses = request
+    let mut responses = request
         .pubkeys
         .iter()
         .map(|pubkey_bytes| {
@@ -232,7 +266,7 @@ pub fn delete<T: SlotClock + 'static, E: EthSpec>(
                 &mut initialized_validators,
                 task_executor.clone(),
             ) {
-                Ok(status) => Status::ok(status),
+                Ok(status) => status,
                 Err(error) => {
                     warn!(
                         log,
@@ -240,7 +274,11 @@ pub fn delete<T: SlotClock + 'static, E: EthSpec>(
                         "pubkey" => ?pubkey_bytes,
                         "error" => ?error,
                     );
-                    Status::error(DeleteKeystoreStatus::Error, error)
+                    SingleExportKeystoresResponse {
+                        status: Status::error(DeleteKeystoreStatus::Error, error),
+                        validating_keystore: None,
+                        validating_keystore_password: None,
+                    }
                 }
             }
         })
@@ -263,19 +301,19 @@ pub fn delete<T: SlotClock + 'static, E: EthSpec>(
         })?;
 
     // Update stasuses based on availability of slashing protection data.
-    for (pubkey, status) in request.pubkeys.iter().zip(statuses.iter_mut()) {
-        if status.status == DeleteKeystoreStatus::NotFound
+    for (pubkey, response) in request.pubkeys.iter().zip(responses.iter_mut()) {
+        if response.status.status == DeleteKeystoreStatus::NotFound
             && slashing_protection
                 .data
                 .iter()
                 .any(|interchange_data| interchange_data.pubkey == *pubkey)
         {
-            status.status = DeleteKeystoreStatus::NotActive;
+            response.status.status = DeleteKeystoreStatus::NotActive;
         }
     }
 
-    Ok(DeleteKeystoresResponse {
-        data: statuses,
+    Ok(ExportKeystoresResponse {
+        data: responses,
         slashing_protection,
     })
 }
@@ -284,7 +322,7 @@ fn delete_single_keystore(
     pubkey_bytes: &PublicKeyBytes,
     initialized_validators: &mut InitializedValidators,
     task_executor: TaskExecutor,
-) -> Result<DeleteKeystoreStatus, String> {
+) -> Result<SingleExportKeystoresResponse, String> {
     if let Some(handle) = task_executor.handle() {
         let pubkey = pubkey_bytes
             .decompress()
@@ -292,9 +330,22 @@ fn delete_single_keystore(
 
         match handle.block_on(initialized_validators.delete_definition_and_keystore(&pubkey, true))
         {
-            Ok(_) => Ok(DeleteKeystoreStatus::Deleted),
+            Ok(Some(keystore_and_password)) => Ok(SingleExportKeystoresResponse {
+                status: Status::ok(DeleteKeystoreStatus::Deleted),
+                validating_keystore: Some(KeystoreJsonStr(keystore_and_password.keystore)),
+                validating_keystore_password: keystore_and_password.password,
+            }),
+            Ok(None) => Ok(SingleExportKeystoresResponse {
+                status: Status::ok(DeleteKeystoreStatus::Deleted),
+                validating_keystore: None,
+                validating_keystore_password: None,
+            }),
             Err(e) => match e {
-                Error::ValidatorNotInitialized(_) => Ok(DeleteKeystoreStatus::NotFound),
+                Error::ValidatorNotInitialized(_) => Ok(SingleExportKeystoresResponse {
+                    status: Status::ok(DeleteKeystoreStatus::NotFound),
+                    validating_keystore: None,
+                    validating_keystore_password: None,
+                }),
                 _ => Err(format!("unable to disable and delete: {:?}", e)),
             },
         }
diff --git a/validator_client/src/http_api/mod.rs b/validator_client/src/http_api/mod.rs
index f08c8da1bd..f654833cbb 100644
--- a/validator_client/src/http_api/mod.rs
+++ b/validator_client/src/http_api/mod.rs
@@ -5,6 +5,8 @@ mod keystores;
 mod remotekeys;
 mod tests;
 
+pub mod test_utils;
+
 use crate::http_api::create_signed_voluntary_exit::create_signed_voluntary_exit;
 use crate::{determine_graffiti, GraffitiFile, ValidatorStore};
 use account_utils::{
@@ -12,7 +14,9 @@ use account_utils::{
     validator_definitions::{SigningDefinition, ValidatorDefinition, Web3SignerDefinition},
 };
 pub use api_secret::ApiSecret;
-use create_validator::{create_validators_mnemonic, create_validators_web3signer};
+use create_validator::{
+    create_validators_mnemonic, create_validators_web3signer, get_voting_password_storage,
+};
 use eth2::lighthouse_vc::{
     std_types::{AuthResponse, GetFeeRecipientResponse, GetGasLimitResponse},
     types::{self as api_types, GenericResponse, Graffiti, PublicKey, PublicKeyBytes},
@@ -71,6 +75,7 @@ pub struct Context<T: SlotClock, E: EthSpec> {
     pub api_secret: ApiSecret,
     pub validator_store: Option<Arc<ValidatorStore<T, E>>>,
     pub validator_dir: Option<PathBuf>,
+    pub secrets_dir: Option<PathBuf>,
     pub graffiti_file: Option<GraffitiFile>,
     pub graffiti_flag: Option<Graffiti>,
     pub spec: ChainSpec,
@@ -88,6 +93,8 @@ pub struct Config {
     pub listen_addr: IpAddr,
     pub listen_port: u16,
     pub allow_origin: Option<String>,
+    pub allow_keystore_export: bool,
+    pub store_passwords_in_secrets_dir: bool,
 }
 
 impl Default for Config {
@@ -97,6 +104,8 @@ impl Default for Config {
             listen_addr: IpAddr::V4(Ipv4Addr::new(127, 0, 0, 1)),
             listen_port: 5062,
             allow_origin: None,
+            allow_keystore_export: false,
+            store_passwords_in_secrets_dir: false,
         }
     }
 }
@@ -121,6 +130,8 @@ pub fn serve<T: 'static + SlotClock + Clone, E: EthSpec>(
     shutdown: impl Future<Output = ()> + Send + Sync + 'static,
 ) -> Result<(SocketAddr, impl Future<Output = ()>), Error> {
     let config = &ctx.config;
+    let allow_keystore_export = config.allow_keystore_export;
+    let store_passwords_in_secrets_dir = config.store_passwords_in_secrets_dir;
     let log = ctx.log.clone();
 
     // Configure CORS.
@@ -187,6 +198,17 @@ pub fn serve<T: 'static + SlotClock + Clone, E: EthSpec>(
             })
         });
 
+    let inner_secrets_dir = ctx.secrets_dir.clone();
+    let secrets_dir_filter = warp::any().map(move || inner_secrets_dir.clone()).and_then(
+        |secrets_dir: Option<_>| async move {
+            secrets_dir.ok_or_else(|| {
+                warp_utils::reject::custom_not_found(
+                    "secrets_dir directory is not initialized.".to_string(),
+                )
+            })
+        },
+    );
+
     let inner_graffiti_file = ctx.graffiti_file.clone();
     let graffiti_file_filter = warp::any().map(move || inner_graffiti_file.clone());
 
@@ -394,18 +416,21 @@ pub fn serve<T: 'static + SlotClock + Clone, E: EthSpec>(
         .and(warp::path::end())
         .and(warp::body::json())
         .and(validator_dir_filter.clone())
+        .and(secrets_dir_filter.clone())
         .and(validator_store_filter.clone())
         .and(spec_filter.clone())
         .and(signer.clone())
         .and(task_executor_filter.clone())
         .and_then(
-            |body: Vec<api_types::ValidatorRequest>,
-             validator_dir: PathBuf,
-             validator_store: Arc<ValidatorStore<T, E>>,
-             spec: Arc<ChainSpec>,
-             signer,
-             task_executor: TaskExecutor| {
+            move |body: Vec<api_types::ValidatorRequest>,
+                  validator_dir: PathBuf,
+                  secrets_dir: PathBuf,
+                  validator_store: Arc<ValidatorStore<T, E>>,
+                  spec: Arc<ChainSpec>,
+                  signer,
+                  task_executor: TaskExecutor| {
                 blocking_signed_json_task(signer, move || {
+                    let secrets_dir = store_passwords_in_secrets_dir.then_some(secrets_dir);
                     if let Some(handle) = task_executor.handle() {
                         let (validators, mnemonic) =
                             handle.block_on(create_validators_mnemonic(
@@ -413,6 +438,7 @@ pub fn serve<T: 'static + SlotClock + Clone, E: EthSpec>(
                                 None,
                                 &body,
                                 &validator_dir,
+                                secrets_dir,
                                 &validator_store,
                                 &spec,
                             ))?;
@@ -437,18 +463,21 @@ pub fn serve<T: 'static + SlotClock + Clone, E: EthSpec>(
         .and(warp::path::end())
         .and(warp::body::json())
         .and(validator_dir_filter.clone())
+        .and(secrets_dir_filter.clone())
         .and(validator_store_filter.clone())
         .and(spec_filter)
         .and(signer.clone())
         .and(task_executor_filter.clone())
         .and_then(
-            |body: api_types::CreateValidatorsMnemonicRequest,
-             validator_dir: PathBuf,
-             validator_store: Arc<ValidatorStore<T, E>>,
-             spec: Arc<ChainSpec>,
-             signer,
-             task_executor: TaskExecutor| {
+            move |body: api_types::CreateValidatorsMnemonicRequest,
+                  validator_dir: PathBuf,
+                  secrets_dir: PathBuf,
+                  validator_store: Arc<ValidatorStore<T, E>>,
+                  spec: Arc<ChainSpec>,
+                  signer,
+                  task_executor: TaskExecutor| {
                 blocking_signed_json_task(signer, move || {
+                    let secrets_dir = store_passwords_in_secrets_dir.then_some(secrets_dir);
                     if let Some(handle) = task_executor.handle() {
                         let mnemonic =
                             mnemonic_from_phrase(body.mnemonic.as_str()).map_err(|e| {
@@ -463,6 +492,7 @@ pub fn serve<T: 'static + SlotClock + Clone, E: EthSpec>(
                                 Some(body.key_derivation_path_offset),
                                 &body.validators,
                                 &validator_dir,
+                                secrets_dir,
                                 &validator_store,
                                 &spec,
                             ))?;
@@ -483,15 +513,17 @@ pub fn serve<T: 'static + SlotClock + Clone, E: EthSpec>(
         .and(warp::path::end())
         .and(warp::body::json())
         .and(validator_dir_filter.clone())
+        .and(secrets_dir_filter.clone())
         .and(validator_store_filter.clone())
         .and(signer.clone())
         .and(task_executor_filter.clone())
         .and_then(
-            |body: api_types::KeystoreValidatorsPostRequest,
-             validator_dir: PathBuf,
-             validator_store: Arc<ValidatorStore<T, E>>,
-             signer,
-             task_executor: TaskExecutor| {
+            move |body: api_types::KeystoreValidatorsPostRequest,
+                  validator_dir: PathBuf,
+                  secrets_dir: PathBuf,
+                  validator_store: Arc<ValidatorStore<T, E>>,
+                  signer,
+                  task_executor: TaskExecutor| {
                 blocking_signed_json_task(signer, move || {
                     // Check to ensure the password is correct.
                     let keypair = body
@@ -504,7 +536,12 @@ pub fn serve<T: 'static + SlotClock + Clone, E: EthSpec>(
                             ))
                         })?;
 
+                    let secrets_dir = store_passwords_in_secrets_dir.then_some(secrets_dir);
+                    let password_storage =
+                        get_voting_password_storage(&secrets_dir, &body.keystore, &body.password)?;
+
                     let validator_dir = ValidatorDirBuilder::new(validator_dir.clone())
+                        .password_dir_opt(secrets_dir)
                         .voting_keystore(body.keystore.clone(), body.password.as_ref())
                         .store_withdrawal_keystore(false)
                         .build()
@@ -518,7 +555,6 @@ pub fn serve<T: 'static + SlotClock + Clone, E: EthSpec>(
                     // Drop validator dir so that `add_validator_keystore` can re-lock the keystore.
                     let voting_keystore_path = validator_dir.voting_keystore_path();
                     drop(validator_dir);
-                    let voting_password = body.password.clone();
                     let graffiti = body.graffiti.clone();
                     let suggested_fee_recipient = body.suggested_fee_recipient;
                     let gas_limit = body.gas_limit;
@@ -529,7 +565,7 @@ pub fn serve<T: 'static + SlotClock + Clone, E: EthSpec>(
                             handle
                                 .block_on(validator_store.add_validator_keystore(
                                     voting_keystore_path,
-                                    voting_password,
+                                    password_storage,
                                     body.enable,
                                     graffiti,
                                     suggested_fee_recipient,
@@ -698,6 +734,29 @@ pub fn serve<T: 'static + SlotClock + Clone, E: EthSpec>(
             })
         });
 
+    // DELETE /lighthouse/keystores
+    let delete_lighthouse_keystores = warp::path("lighthouse")
+        .and(warp::path("keystores"))
+        .and(warp::path::end())
+        .and(warp::body::json())
+        .and(signer.clone())
+        .and(validator_store_filter.clone())
+        .and(task_executor_filter.clone())
+        .and(log_filter.clone())
+        .and_then(
+            move |request, signer, validator_store, task_executor, log| {
+                blocking_signed_json_task(signer, move || {
+                    if allow_keystore_export {
+                        keystores::export(request, validator_store, task_executor, log)
+                    } else {
+                        Err(warp_utils::reject::custom_bad_request(
+                            "keystore export is disabled".to_string(),
+                        ))
+                    }
+                })
+            },
+        );
+
     // Standard key-manager endpoints.
     let eth_v1 = warp::path("eth").and(warp::path("v1"));
     let std_keystores = eth_v1.and(warp::path("keystores")).and(warp::path::end());
@@ -982,13 +1041,28 @@ pub fn serve<T: 'static + SlotClock + Clone, E: EthSpec>(
         .and(warp::body::json())
         .and(signer.clone())
         .and(validator_dir_filter)
+        .and(secrets_dir_filter)
         .and(validator_store_filter.clone())
         .and(task_executor_filter.clone())
         .and(log_filter.clone())
         .and_then(
-            |request, signer, validator_dir, validator_store, task_executor, log| {
+            move |request,
+                  signer,
+                  validator_dir,
+                  secrets_dir,
+                  validator_store,
+                  task_executor,
+                  log| {
+                let secrets_dir = store_passwords_in_secrets_dir.then_some(secrets_dir);
                 blocking_signed_json_task(signer, move || {
-                    keystores::import(request, validator_dir, validator_store, task_executor, log)
+                    keystores::import(
+                        request,
+                        validator_dir,
+                        secrets_dir,
+                        validator_store,
+                        task_executor,
+                        log,
+                    )
                 })
             },
         );
@@ -1117,7 +1191,8 @@ pub fn serve<T: 'static + SlotClock + Clone, E: EthSpec>(
                 ))
                 .or(warp::patch().and(patch_validators))
                 .or(warp::delete().and(
-                    delete_fee_recipient
+                    delete_lighthouse_keystores
+                        .or(delete_fee_recipient)
                         .or(delete_gas_limit)
                         .or(delete_std_keystores)
                         .or(delete_std_remotekeys),
diff --git a/validator_client/src/http_api/test_utils.rs b/validator_client/src/http_api/test_utils.rs
new file mode 100644
index 0000000000..c7558dd586
--- /dev/null
+++ b/validator_client/src/http_api/test_utils.rs
@@ -0,0 +1,631 @@
+use crate::doppelganger_service::DoppelgangerService;
+use crate::key_cache::{KeyCache, CACHE_FILENAME};
+use crate::{
+    http_api::{ApiSecret, Config as HttpConfig, Context},
+    initialized_validators::{InitializedValidators, OnDecryptFailure},
+    Config, ValidatorDefinitions, ValidatorStore,
+};
+use account_utils::{
+    eth2_wallet::WalletBuilder, mnemonic_from_phrase, random_mnemonic, random_password,
+    ZeroizeString,
+};
+use deposit_contract::decode_eth1_tx_data;
+use eth2::{
+    lighthouse_vc::{http_client::ValidatorClientHttpClient, types::*},
+    types::ErrorMessage as ApiErrorMessage,
+    Error as ApiError,
+};
+use eth2_keystore::KeystoreBuilder;
+use logging::test_logger;
+use parking_lot::RwLock;
+use sensitive_url::SensitiveUrl;
+use slashing_protection::{SlashingDatabase, SLASHING_PROTECTION_FILENAME};
+use slot_clock::{SlotClock, TestingSlotClock};
+use std::future::Future;
+use std::marker::PhantomData;
+use std::net::{IpAddr, Ipv4Addr};
+use std::sync::Arc;
+use std::time::Duration;
+use task_executor::test_utils::TestRuntime;
+use tempfile::{tempdir, TempDir};
+use tokio::sync::oneshot;
+
+pub const PASSWORD_BYTES: &[u8] = &[42, 50, 37];
+pub const TEST_DEFAULT_FEE_RECIPIENT: Address = Address::repeat_byte(42);
+
+type E = MainnetEthSpec;
+
+pub struct HdValidatorScenario {
+    pub count: usize,
+    pub specify_mnemonic: bool,
+    pub key_derivation_path_offset: u32,
+    pub disabled: Vec<usize>,
+}
+
+pub struct KeystoreValidatorScenario {
+    pub enabled: bool,
+    pub correct_password: bool,
+}
+
+pub struct Web3SignerValidatorScenario {
+    pub count: usize,
+    pub enabled: bool,
+}
+
+pub struct ApiTester {
+    pub client: ValidatorClientHttpClient,
+    pub initialized_validators: Arc<RwLock<InitializedValidators>>,
+    pub validator_store: Arc<ValidatorStore<TestingSlotClock, E>>,
+    pub url: SensitiveUrl,
+    pub api_token: String,
+    pub test_runtime: TestRuntime,
+    pub _server_shutdown: oneshot::Sender<()>,
+    pub validator_dir: TempDir,
+    pub secrets_dir: TempDir,
+}
+
+impl ApiTester {
+    pub async fn new() -> Self {
+        Self::new_with_http_config(Self::default_http_config()).await
+    }
+
+    pub async fn new_with_http_config(http_config: HttpConfig) -> Self {
+        let log = test_logger();
+
+        let validator_dir = tempdir().unwrap();
+        let secrets_dir = tempdir().unwrap();
+
+        let validator_defs = ValidatorDefinitions::open_or_create(validator_dir.path()).unwrap();
+
+        let initialized_validators = InitializedValidators::from_definitions(
+            validator_defs,
+            validator_dir.path().into(),
+            log.clone(),
+        )
+        .await
+        .unwrap();
+
+        let api_secret = ApiSecret::create_or_open(validator_dir.path()).unwrap();
+        let api_pubkey = api_secret.api_token();
+
+        let config = Config {
+            validator_dir: validator_dir.path().into(),
+            secrets_dir: secrets_dir.path().into(),
+            fee_recipient: Some(TEST_DEFAULT_FEE_RECIPIENT),
+            ..Default::default()
+        };
+
+        let spec = E::default_spec();
+
+        let slashing_db_path = config.validator_dir.join(SLASHING_PROTECTION_FILENAME);
+        let slashing_protection = SlashingDatabase::open_or_create(&slashing_db_path).unwrap();
+
+        let slot_clock =
+            TestingSlotClock::new(Slot::new(0), Duration::from_secs(0), Duration::from_secs(1));
+
+        let test_runtime = TestRuntime::default();
+
+        let validator_store = Arc::new(ValidatorStore::<_, E>::new(
+            initialized_validators,
+            slashing_protection,
+            Hash256::repeat_byte(42),
+            spec,
+            Some(Arc::new(DoppelgangerService::new(log.clone()))),
+            slot_clock.clone(),
+            &config,
+            test_runtime.task_executor.clone(),
+            log.clone(),
+        ));
+
+        validator_store
+            .register_all_in_doppelganger_protection_if_enabled()
+            .expect("Should attach doppelganger service");
+
+        let initialized_validators = validator_store.initialized_validators();
+
+        let context = Arc::new(Context {
+            task_executor: test_runtime.task_executor.clone(),
+            api_secret,
+            validator_dir: Some(validator_dir.path().into()),
+            secrets_dir: Some(secrets_dir.path().into()),
+            validator_store: Some(validator_store.clone()),
+            graffiti_file: None,
+            graffiti_flag: Some(Graffiti::default()),
+            spec: E::default_spec(),
+            config: http_config,
+            log,
+            sse_logging_components: None,
+            slot_clock,
+            _phantom: PhantomData,
+        });
+        let ctx = context;
+        let (shutdown_tx, shutdown_rx) = oneshot::channel();
+        let server_shutdown = async {
+            // It's not really interesting why this triggered, just that it happened.
+            let _ = shutdown_rx.await;
+        };
+        let (listening_socket, server) = super::serve(ctx, server_shutdown).unwrap();
+
+        tokio::spawn(server);
+
+        let url = SensitiveUrl::parse(&format!(
+            "http://{}:{}",
+            listening_socket.ip(),
+            listening_socket.port()
+        ))
+        .unwrap();
+
+        let client = ValidatorClientHttpClient::new(url.clone(), api_pubkey.clone()).unwrap();
+
+        Self {
+            client,
+            initialized_validators,
+            validator_store,
+            url,
+            api_token: api_pubkey,
+            test_runtime,
+            _server_shutdown: shutdown_tx,
+            validator_dir,
+            secrets_dir,
+        }
+    }
+
+    pub fn default_http_config() -> HttpConfig {
+        HttpConfig {
+            enabled: true,
+            listen_addr: IpAddr::V4(Ipv4Addr::new(127, 0, 0, 1)),
+            listen_port: 0,
+            allow_origin: None,
+            allow_keystore_export: true,
+            store_passwords_in_secrets_dir: false,
+        }
+    }
+
+    /// Checks that the key cache exists and can be decrypted with the current
+    /// set of known validators.
+    #[allow(clippy::await_holding_lock)] // This is a test, so it should be fine.
+    pub async fn ensure_key_cache_consistency(&self) {
+        assert!(
+            self.validator_dir.as_ref().join(CACHE_FILENAME).exists(),
+            "the key cache should exist"
+        );
+        let key_cache =
+            KeyCache::open_or_create(self.validator_dir.as_ref()).expect("should open a key cache");
+
+        self.initialized_validators
+            .read()
+            .decrypt_key_cache(key_cache, &mut <_>::default(), OnDecryptFailure::Error)
+            .await
+            .expect("key cache should decypt");
+    }
+
+    pub fn invalid_token_client(&self) -> ValidatorClientHttpClient {
+        let tmp = tempdir().unwrap();
+        let api_secret = ApiSecret::create_or_open(tmp.path()).unwrap();
+        let invalid_pubkey = api_secret.api_token();
+        ValidatorClientHttpClient::new(self.url.clone(), invalid_pubkey).unwrap()
+    }
+
+    pub async fn test_with_invalid_auth<F, A, T>(self, func: F) -> Self
+    where
+        F: Fn(ValidatorClientHttpClient) -> A,
+        A: Future<Output = Result<T, ApiError>>,
+    {
+        /*
+         * Test with an invalid Authorization header.
+         */
+        match func(self.invalid_token_client()).await {
+            Err(ApiError::ServerMessage(ApiErrorMessage { code: 403, .. })) => (),
+            Err(other) => panic!("expected authorized error, got {:?}", other),
+            Ok(_) => panic!("expected authorized error, got Ok"),
+        }
+
+        /*
+         * Test with a missing Authorization header.
+         */
+        let mut missing_token_client = self.client.clone();
+        missing_token_client.send_authorization_header(false);
+        match func(missing_token_client).await {
+            Err(ApiError::ServerMessage(ApiErrorMessage {
+                code: 401, message, ..
+            })) if message.contains("missing Authorization header") => (),
+            Err(other) => panic!("expected missing header error, got {:?}", other),
+            Ok(_) => panic!("expected missing header error, got Ok"),
+        }
+
+        self
+    }
+
+    pub fn invalidate_api_token(mut self) -> Self {
+        self.client = self.invalid_token_client();
+        self
+    }
+
+    pub async fn test_get_lighthouse_version_invalid(self) -> Self {
+        self.client.get_lighthouse_version().await.unwrap_err();
+        self
+    }
+
+    pub async fn test_get_lighthouse_spec(self) -> Self {
+        let result = self
+            .client
+            .get_lighthouse_spec::<ConfigAndPresetBellatrix>()
+            .await
+            .map(|res| ConfigAndPreset::Bellatrix(res.data))
+            .unwrap();
+        let expected = ConfigAndPreset::from_chain_spec::<E>(&E::default_spec(), None);
+
+        assert_eq!(result, expected);
+
+        self
+    }
+
+    pub async fn test_get_lighthouse_version(self) -> Self {
+        let result = self.client.get_lighthouse_version().await.unwrap().data;
+
+        let expected = VersionData {
+            version: lighthouse_version::version_with_platform(),
+        };
+
+        assert_eq!(result, expected);
+
+        self
+    }
+
+    #[cfg(target_os = "linux")]
+    pub async fn test_get_lighthouse_health(self) -> Self {
+        self.client.get_lighthouse_health().await.unwrap();
+
+        self
+    }
+
+    #[cfg(not(target_os = "linux"))]
+    pub async fn test_get_lighthouse_health(self) -> Self {
+        self.client.get_lighthouse_health().await.unwrap_err();
+
+        self
+    }
+    pub fn vals_total(&self) -> usize {
+        self.initialized_validators.read().num_total()
+    }
+
+    pub fn vals_enabled(&self) -> usize {
+        self.initialized_validators.read().num_enabled()
+    }
+
+    pub fn assert_enabled_validators_count(self, count: usize) -> Self {
+        assert_eq!(self.vals_enabled(), count);
+        self
+    }
+
+    pub fn assert_validators_count(self, count: usize) -> Self {
+        assert_eq!(self.vals_total(), count);
+        self
+    }
+
+    pub async fn create_hd_validators(self, s: HdValidatorScenario) -> Self {
+        let initial_vals = self.vals_total();
+        let initial_enabled_vals = self.vals_enabled();
+
+        let validators = (0..s.count)
+            .map(|i| ValidatorRequest {
+                enable: !s.disabled.contains(&i),
+                description: format!("boi #{}", i),
+                graffiti: None,
+                suggested_fee_recipient: None,
+                gas_limit: None,
+                builder_proposals: None,
+                deposit_gwei: E::default_spec().max_effective_balance,
+            })
+            .collect::<Vec<_>>();
+
+        let (response, mnemonic) = if s.specify_mnemonic {
+            let mnemonic = ZeroizeString::from(random_mnemonic().phrase().to_string());
+            let request = CreateValidatorsMnemonicRequest {
+                mnemonic: mnemonic.clone(),
+                key_derivation_path_offset: s.key_derivation_path_offset,
+                validators: validators.clone(),
+            };
+            let response = self
+                .client
+                .post_lighthouse_validators_mnemonic(&request)
+                .await
+                .unwrap()
+                .data;
+
+            (response, mnemonic)
+        } else {
+            assert_eq!(
+                s.key_derivation_path_offset, 0,
+                "cannot use a derivation offset without specifying a mnemonic"
+            );
+            let response = self
+                .client
+                .post_lighthouse_validators(validators.clone())
+                .await
+                .unwrap()
+                .data;
+            (response.validators.clone(), response.mnemonic)
+        };
+
+        assert_eq!(response.len(), s.count);
+        assert_eq!(self.vals_total(), initial_vals + s.count);
+        assert_eq!(
+            self.vals_enabled(),
+            initial_enabled_vals + s.count - s.disabled.len()
+        );
+
+        let server_vals = self.client.get_lighthouse_validators().await.unwrap().data;
+
+        assert_eq!(server_vals.len(), self.vals_total());
+
+        // Ensure the server lists all of these newly created validators.
+        for validator in &response {
+            assert!(server_vals
+                .iter()
+                .any(|server_val| server_val.voting_pubkey == validator.voting_pubkey));
+        }
+
+        /*
+         * Verify that we can regenerate all the keys from the mnemonic.
+         */
+
+        let mnemonic = mnemonic_from_phrase(mnemonic.as_str()).unwrap();
+        let mut wallet = WalletBuilder::from_mnemonic(&mnemonic, PASSWORD_BYTES, "".to_string())
+            .unwrap()
+            .build()
+            .unwrap();
+
+        wallet
+            .set_nextaccount(s.key_derivation_path_offset)
+            .unwrap();
+
+        for item in response.iter().take(s.count) {
+            let keypairs = wallet
+                .next_validator(PASSWORD_BYTES, PASSWORD_BYTES, PASSWORD_BYTES)
+                .unwrap();
+            let voting_keypair = keypairs.voting.decrypt_keypair(PASSWORD_BYTES).unwrap();
+
+            assert_eq!(
+                item.voting_pubkey,
+                voting_keypair.pk.clone().into(),
+                "the locally generated voting pk should match the server response"
+            );
+
+            let withdrawal_keypair = keypairs.withdrawal.decrypt_keypair(PASSWORD_BYTES).unwrap();
+
+            let deposit_bytes = serde_utils::hex::decode(&item.eth1_deposit_tx_data).unwrap();
+
+            let (deposit_data, _) =
+                decode_eth1_tx_data(&deposit_bytes, E::default_spec().max_effective_balance)
+                    .unwrap();
+
+            assert_eq!(
+                deposit_data.pubkey,
+                voting_keypair.pk.clone().into(),
+                "the locally generated voting pk should match the deposit data"
+            );
+
+            assert_eq!(
+                deposit_data.withdrawal_credentials,
+                Hash256::from_slice(&bls::get_withdrawal_credentials(
+                    &withdrawal_keypair.pk,
+                    E::default_spec().bls_withdrawal_prefix_byte
+                )),
+                "the locally generated withdrawal creds should match the deposit data"
+            );
+
+            assert_eq!(
+                deposit_data.signature,
+                deposit_data.create_signature(&voting_keypair.sk, &E::default_spec()),
+                "the locally-generated deposit sig should create the same deposit sig"
+            );
+        }
+
+        self
+    }
+
+    pub async fn create_keystore_validators(self, s: KeystoreValidatorScenario) -> Self {
+        let initial_vals = self.vals_total();
+        let initial_enabled_vals = self.vals_enabled();
+
+        let password = random_password();
+        let keypair = Keypair::random();
+        let keystore = KeystoreBuilder::new(&keypair, password.as_bytes(), String::new())
+            .unwrap()
+            .build()
+            .unwrap();
+
+        if !s.correct_password {
+            let request = KeystoreValidatorsPostRequest {
+                enable: s.enabled,
+                password: String::from_utf8(random_password().as_ref().to_vec())
+                    .unwrap()
+                    .into(),
+                keystore,
+                graffiti: None,
+                suggested_fee_recipient: None,
+                gas_limit: None,
+                builder_proposals: None,
+            };
+
+            self.client
+                .post_lighthouse_validators_keystore(&request)
+                .await
+                .unwrap_err();
+
+            return self;
+        }
+
+        let request = KeystoreValidatorsPostRequest {
+            enable: s.enabled,
+            password: String::from_utf8(password.as_ref().to_vec())
+                .unwrap()
+                .into(),
+            keystore,
+            graffiti: None,
+            suggested_fee_recipient: None,
+            gas_limit: None,
+            builder_proposals: None,
+        };
+
+        let response = self
+            .client
+            .post_lighthouse_validators_keystore(&request)
+            .await
+            .unwrap()
+            .data;
+
+        let num_enabled = s.enabled as usize;
+
+        assert_eq!(self.vals_total(), initial_vals + 1);
+        assert_eq!(self.vals_enabled(), initial_enabled_vals + num_enabled);
+
+        let server_vals = self.client.get_lighthouse_validators().await.unwrap().data;
+
+        assert_eq!(server_vals.len(), self.vals_total());
+
+        assert_eq!(response.voting_pubkey, keypair.pk.into());
+        assert_eq!(response.enabled, s.enabled);
+
+        self
+    }
+
+    pub async fn create_web3signer_validators(self, s: Web3SignerValidatorScenario) -> Self {
+        let initial_vals = self.vals_total();
+        let initial_enabled_vals = self.vals_enabled();
+
+        let request: Vec<_> = (0..s.count)
+            .map(|i| {
+                let kp = Keypair::random();
+                Web3SignerValidatorRequest {
+                    enable: s.enabled,
+                    description: format!("{}", i),
+                    graffiti: None,
+                    suggested_fee_recipient: None,
+                    gas_limit: None,
+                    builder_proposals: None,
+                    voting_public_key: kp.pk,
+                    url: format!("http://signer_{}.com/", i),
+                    root_certificate_path: None,
+                    request_timeout_ms: None,
+                    client_identity_path: None,
+                    client_identity_password: None,
+                }
+            })
+            .collect();
+
+        self.client
+            .post_lighthouse_validators_web3signer(&request)
+            .await
+            .unwrap();
+
+        assert_eq!(self.vals_total(), initial_vals + s.count);
+        if s.enabled {
+            assert_eq!(self.vals_enabled(), initial_enabled_vals + s.count);
+        } else {
+            assert_eq!(self.vals_enabled(), initial_enabled_vals);
+        };
+
+        self
+    }
+
+    pub async fn set_validator_enabled(self, index: usize, enabled: bool) -> Self {
+        let validator = &self.client.get_lighthouse_validators().await.unwrap().data[index];
+
+        self.client
+            .patch_lighthouse_validators(&validator.voting_pubkey, Some(enabled), None, None, None)
+            .await
+            .unwrap();
+
+        assert_eq!(
+            self.initialized_validators
+                .read()
+                .is_enabled(&validator.voting_pubkey.decompress().unwrap())
+                .unwrap(),
+            enabled
+        );
+
+        assert!(self
+            .client
+            .get_lighthouse_validators()
+            .await
+            .unwrap()
+            .data
+            .into_iter()
+            .find(|v| v.voting_pubkey == validator.voting_pubkey)
+            .map(|v| v.enabled == enabled)
+            .unwrap());
+
+        // Check the server via an individual request.
+        assert_eq!(
+            self.client
+                .get_lighthouse_validators_pubkey(&validator.voting_pubkey)
+                .await
+                .unwrap()
+                .unwrap()
+                .data
+                .enabled,
+            enabled
+        );
+
+        self
+    }
+
+    pub async fn set_gas_limit(self, index: usize, gas_limit: u64) -> Self {
+        let validator = &self.client.get_lighthouse_validators().await.unwrap().data[index];
+
+        self.client
+            .patch_lighthouse_validators(
+                &validator.voting_pubkey,
+                None,
+                Some(gas_limit),
+                None,
+                None,
+            )
+            .await
+            .unwrap();
+
+        self
+    }
+
+    pub async fn assert_gas_limit(self, index: usize, gas_limit: u64) -> Self {
+        let validator = &self.client.get_lighthouse_validators().await.unwrap().data[index];
+
+        assert_eq!(
+            self.validator_store.get_gas_limit(&validator.voting_pubkey),
+            gas_limit
+        );
+
+        self
+    }
+
+    pub async fn set_builder_proposals(self, index: usize, builder_proposals: bool) -> Self {
+        let validator = &self.client.get_lighthouse_validators().await.unwrap().data[index];
+
+        self.client
+            .patch_lighthouse_validators(
+                &validator.voting_pubkey,
+                None,
+                None,
+                Some(builder_proposals),
+                None,
+            )
+            .await
+            .unwrap();
+
+        self
+    }
+
+    pub async fn assert_builder_proposals(self, index: usize, builder_proposals: bool) -> Self {
+        let validator = &self.client.get_lighthouse_validators().await.unwrap().data[index];
+
+        assert_eq!(
+            self.validator_store
+                .get_builder_proposals(&validator.voting_pubkey),
+            builder_proposals
+        );
+
+        self
+    }
+}
diff --git a/validator_client/src/http_api/tests.rs b/validator_client/src/http_api/tests.rs
index dbb9d4d620..3bff444703 100644
--- a/validator_client/src/http_api/tests.rs
+++ b/validator_client/src/http_api/tests.rs
@@ -31,10 +31,8 @@ use std::net::{IpAddr, Ipv4Addr};
 use std::str::FromStr;
 use std::sync::Arc;
 use std::time::Duration;
-use task_executor::TaskExecutor;
+use task_executor::test_utils::TestRuntime;
 use tempfile::{tempdir, TempDir};
-use tokio::runtime::Runtime;
-use tokio::sync::oneshot;
 use types::graffiti::GraffitiString;
 
 const PASSWORD_BYTES: &[u8] = &[42, 50, 37];
@@ -48,23 +46,12 @@ struct ApiTester {
     validator_store: Arc<ValidatorStore<TestingSlotClock, E>>,
     url: SensitiveUrl,
     slot_clock: TestingSlotClock,
-    _server_shutdown: oneshot::Sender<()>,
     _validator_dir: TempDir,
-    _runtime_shutdown: exit_future::Signal,
-}
-
-// Builds a runtime to be used in the testing configuration.
-fn build_runtime() -> Arc<Runtime> {
-    Arc::new(
-        tokio::runtime::Builder::new_multi_thread()
-            .enable_all()
-            .build()
-            .expect("Should be able to build a testing runtime"),
-    )
+    _test_runtime: TestRuntime,
 }
 
 impl ApiTester {
-    pub async fn new(runtime: std::sync::Weak<Runtime>) -> Self {
+    pub async fn new() -> Self {
         let log = test_logger();
 
         let validator_dir = tempdir().unwrap();
@@ -100,9 +87,7 @@ impl ApiTester {
             Duration::from_secs(1),
         );
 
-        let (runtime_shutdown, exit) = exit_future::signal();
-        let (shutdown_tx, _) = futures::channel::mpsc::channel(1);
-        let executor = TaskExecutor::new(runtime.clone(), exit, log.clone(), shutdown_tx);
+        let test_runtime = TestRuntime::default();
 
         let validator_store = Arc::new(ValidatorStore::<_, E>::new(
             initialized_validators,
@@ -112,7 +97,7 @@ impl ApiTester {
             Some(Arc::new(DoppelgangerService::new(log.clone()))),
             slot_clock.clone(),
             &config,
-            executor.clone(),
+            test_runtime.task_executor.clone(),
             log.clone(),
         ));
 
@@ -123,9 +108,10 @@ impl ApiTester {
         let initialized_validators = validator_store.initialized_validators();
 
         let context = Arc::new(Context {
-            task_executor: executor,
+            task_executor: test_runtime.task_executor.clone(),
             api_secret,
             validator_dir: Some(validator_dir.path().into()),
+            secrets_dir: Some(secrets_dir.path().into()),
             validator_store: Some(validator_store.clone()),
             graffiti_file: None,
             graffiti_flag: Some(Graffiti::default()),
@@ -135,6 +121,8 @@ impl ApiTester {
                 listen_addr: IpAddr::V4(Ipv4Addr::new(127, 0, 0, 1)),
                 listen_port: 0,
                 allow_origin: None,
+                allow_keystore_export: true,
+                store_passwords_in_secrets_dir: false,
             },
             sse_logging_components: None,
             log,
@@ -142,12 +130,8 @@ impl ApiTester {
             _phantom: PhantomData,
         });
         let ctx = context.clone();
-        let (shutdown_tx, shutdown_rx) = oneshot::channel();
-        let server_shutdown = async {
-            // It's not really interesting why this triggered, just that it happened.
-            let _ = shutdown_rx.await;
-        };
-        let (listening_socket, server) = super::serve(ctx, server_shutdown).unwrap();
+        let (listening_socket, server) =
+            super::serve(ctx, test_runtime.task_executor.exit()).unwrap();
 
         tokio::spawn(async { server.await });
 
@@ -166,9 +150,8 @@ impl ApiTester {
             validator_store,
             url,
             slot_clock,
-            _server_shutdown: shutdown_tx,
             _validator_dir: validator_dir,
-            _runtime_shutdown: runtime_shutdown,
+            _test_runtime: test_runtime,
         }
     }
 
@@ -676,387 +659,341 @@ struct Web3SignerValidatorScenario {
     enabled: bool,
 }
 
-#[test]
-fn invalid_pubkey() {
-    let runtime = build_runtime();
-    let weak_runtime = Arc::downgrade(&runtime);
-    runtime.block_on(async {
-        ApiTester::new(weak_runtime)
-            .await
-            .invalidate_api_token()
-            .test_get_lighthouse_version_invalid()
-            .await;
-    });
+#[tokio::test]
+async fn invalid_pubkey() {
+    ApiTester::new()
+        .await
+        .invalidate_api_token()
+        .test_get_lighthouse_version_invalid()
+        .await;
 }
 
-#[test]
-fn routes_with_invalid_auth() {
-    let runtime = build_runtime();
-    let weak_runtime = Arc::downgrade(&runtime);
-    runtime.block_on(async {
-        ApiTester::new(weak_runtime)
-            .await
-            .test_with_invalid_auth(|client| async move { client.get_lighthouse_version().await })
-            .await
-            .test_with_invalid_auth(|client| async move { client.get_lighthouse_health().await })
-            .await
-            .test_with_invalid_auth(|client| async move {
-                client.get_lighthouse_spec::<types::Config>().await
-            })
-            .await
-            .test_with_invalid_auth(
-                |client| async move { client.get_lighthouse_validators().await },
-            )
-            .await
-            .test_with_invalid_auth(|client| async move {
-                client
-                    .get_lighthouse_validators_pubkey(&PublicKeyBytes::empty())
-                    .await
-            })
-            .await
-            .test_with_invalid_auth(|client| async move {
-                client
-                    .post_lighthouse_validators(vec![ValidatorRequest {
-                        enable: <_>::default(),
-                        description: <_>::default(),
-                        graffiti: <_>::default(),
-                        suggested_fee_recipient: <_>::default(),
-                        gas_limit: <_>::default(),
-                        builder_proposals: <_>::default(),
-                        deposit_gwei: <_>::default(),
-                    }])
-                    .await
-            })
-            .await
-            .test_with_invalid_auth(|client| async move {
-                client
-                    .post_lighthouse_validators_mnemonic(&CreateValidatorsMnemonicRequest {
-                        mnemonic: String::default().into(),
-                        key_derivation_path_offset: <_>::default(),
-                        validators: <_>::default(),
-                    })
-                    .await
-            })
-            .await
-            .test_with_invalid_auth(|client| async move {
-                let password = random_password();
-                let keypair = Keypair::random();
-                let keystore = KeystoreBuilder::new(&keypair, password.as_bytes(), String::new())
-                    .unwrap()
-                    .build()
-                    .unwrap();
-                client
-                    .post_lighthouse_validators_keystore(&KeystoreValidatorsPostRequest {
-                        password: String::default().into(),
-                        enable: <_>::default(),
-                        keystore,
-                        graffiti: <_>::default(),
-                        suggested_fee_recipient: <_>::default(),
-                        gas_limit: <_>::default(),
-                        builder_proposals: <_>::default(),
-                    })
-                    .await
-            })
-            .await
-            .test_with_invalid_auth(|client| async move {
-                client
-                    .patch_lighthouse_validators(
-                        &PublicKeyBytes::empty(),
-                        Some(false),
-                        None,
-                        None,
-                        None,
-                    )
-                    .await
-            })
-            .await
-            .test_with_invalid_auth(|client| async move { client.get_keystores().await })
-            .await
-            .test_with_invalid_auth(|client| async move {
-                let password = random_password_string();
-                let keypair = Keypair::random();
-                let keystore = KeystoreBuilder::new(&keypair, password.as_ref(), String::new())
-                    .unwrap()
-                    .build()
-                    .map(KeystoreJsonStr)
-                    .unwrap();
-                client
-                    .post_keystores(&ImportKeystoresRequest {
-                        keystores: vec![keystore],
-                        passwords: vec![password],
-                        slashing_protection: None,
-                    })
-                    .await
-            })
-            .await
-            .test_with_invalid_auth(|client| async move {
-                let keypair = Keypair::random();
-                client
-                    .delete_keystores(&DeleteKeystoresRequest {
-                        pubkeys: vec![keypair.pk.compress()],
-                    })
-                    .await
-            })
-            .await
-    });
+#[tokio::test]
+async fn routes_with_invalid_auth() {
+    ApiTester::new()
+        .await
+        .test_with_invalid_auth(|client| async move { client.get_lighthouse_version().await })
+        .await
+        .test_with_invalid_auth(|client| async move { client.get_lighthouse_health().await })
+        .await
+        .test_with_invalid_auth(|client| async move {
+            client.get_lighthouse_spec::<types::Config>().await
+        })
+        .await
+        .test_with_invalid_auth(|client| async move { client.get_lighthouse_validators().await })
+        .await
+        .test_with_invalid_auth(|client| async move {
+            client
+                .get_lighthouse_validators_pubkey(&PublicKeyBytes::empty())
+                .await
+        })
+        .await
+        .test_with_invalid_auth(|client| async move {
+            client
+                .post_lighthouse_validators(vec![ValidatorRequest {
+                    enable: <_>::default(),
+                    description: <_>::default(),
+                    graffiti: <_>::default(),
+                    suggested_fee_recipient: <_>::default(),
+                    gas_limit: <_>::default(),
+                    builder_proposals: <_>::default(),
+                    deposit_gwei: <_>::default(),
+                }])
+                .await
+        })
+        .await
+        .test_with_invalid_auth(|client| async move {
+            client
+                .post_lighthouse_validators_mnemonic(&CreateValidatorsMnemonicRequest {
+                    mnemonic: String::default().into(),
+                    key_derivation_path_offset: <_>::default(),
+                    validators: <_>::default(),
+                })
+                .await
+        })
+        .await
+        .test_with_invalid_auth(|client| async move {
+            let password = random_password();
+            let keypair = Keypair::random();
+            let keystore = KeystoreBuilder::new(&keypair, password.as_bytes(), String::new())
+                .unwrap()
+                .build()
+                .unwrap();
+            client
+                .post_lighthouse_validators_keystore(&KeystoreValidatorsPostRequest {
+                    password: String::default().into(),
+                    enable: <_>::default(),
+                    keystore,
+                    graffiti: <_>::default(),
+                    suggested_fee_recipient: <_>::default(),
+                    gas_limit: <_>::default(),
+                    builder_proposals: <_>::default(),
+                })
+                .await
+        })
+        .await
+        .test_with_invalid_auth(|client| async move {
+            client
+                .patch_lighthouse_validators(
+                    &PublicKeyBytes::empty(),
+                    Some(false),
+                    None,
+                    None,
+                    None,
+                )
+                .await
+        })
+        .await
+        .test_with_invalid_auth(|client| async move { client.get_keystores().await })
+        .await
+        .test_with_invalid_auth(|client| async move {
+            let password = random_password_string();
+            let keypair = Keypair::random();
+            let keystore = KeystoreBuilder::new(&keypair, password.as_ref(), String::new())
+                .unwrap()
+                .build()
+                .map(KeystoreJsonStr)
+                .unwrap();
+            client
+                .post_keystores(&ImportKeystoresRequest {
+                    keystores: vec![keystore],
+                    passwords: vec![password],
+                    slashing_protection: None,
+                })
+                .await
+        })
+        .await
+        .test_with_invalid_auth(|client| async move {
+            let keypair = Keypair::random();
+            client
+                .delete_keystores(&DeleteKeystoresRequest {
+                    pubkeys: vec![keypair.pk.compress()],
+                })
+                .await
+        })
+        .await;
 }
 
-#[test]
-fn simple_getters() {
-    let runtime = build_runtime();
-    let weak_runtime = Arc::downgrade(&runtime);
-    runtime.block_on(async {
-        ApiTester::new(weak_runtime)
-            .await
-            .test_get_lighthouse_version()
-            .await
-            .test_get_lighthouse_health()
-            .await
-            .test_get_lighthouse_spec()
-            .await;
-    });
+#[tokio::test]
+async fn simple_getters() {
+    ApiTester::new()
+        .await
+        .test_get_lighthouse_version()
+        .await
+        .test_get_lighthouse_health()
+        .await
+        .test_get_lighthouse_spec()
+        .await;
 }
 
-#[test]
-fn hd_validator_creation() {
-    let runtime = build_runtime();
-    let weak_runtime = Arc::downgrade(&runtime);
-    runtime.block_on(async {
-        ApiTester::new(weak_runtime)
-            .await
-            .assert_enabled_validators_count(0)
-            .assert_validators_count(0)
-            .create_hd_validators(HdValidatorScenario {
-                count: 2,
-                specify_mnemonic: true,
-                key_derivation_path_offset: 0,
-                disabled: vec![],
-            })
-            .await
-            .assert_enabled_validators_count(2)
-            .assert_validators_count(2)
-            .create_hd_validators(HdValidatorScenario {
-                count: 1,
-                specify_mnemonic: false,
-                key_derivation_path_offset: 0,
-                disabled: vec![0],
-            })
-            .await
-            .assert_enabled_validators_count(2)
-            .assert_validators_count(3)
-            .create_hd_validators(HdValidatorScenario {
-                count: 0,
-                specify_mnemonic: true,
-                key_derivation_path_offset: 4,
-                disabled: vec![],
-            })
-            .await
-            .assert_enabled_validators_count(2)
-            .assert_validators_count(3);
-    });
+#[tokio::test]
+async fn hd_validator_creation() {
+    ApiTester::new()
+        .await
+        .assert_enabled_validators_count(0)
+        .assert_validators_count(0)
+        .create_hd_validators(HdValidatorScenario {
+            count: 2,
+            specify_mnemonic: true,
+            key_derivation_path_offset: 0,
+            disabled: vec![],
+        })
+        .await
+        .assert_enabled_validators_count(2)
+        .assert_validators_count(2)
+        .create_hd_validators(HdValidatorScenario {
+            count: 1,
+            specify_mnemonic: false,
+            key_derivation_path_offset: 0,
+            disabled: vec![0],
+        })
+        .await
+        .assert_enabled_validators_count(2)
+        .assert_validators_count(3)
+        .create_hd_validators(HdValidatorScenario {
+            count: 0,
+            specify_mnemonic: true,
+            key_derivation_path_offset: 4,
+            disabled: vec![],
+        })
+        .await
+        .assert_enabled_validators_count(2)
+        .assert_validators_count(3);
 }
 
-#[test]
-fn validator_exit() {
-    let runtime = build_runtime();
-    let weak_runtime = Arc::downgrade(&runtime);
-    runtime.block_on(async {
-        ApiTester::new(weak_runtime)
-            .await
-            .create_hd_validators(HdValidatorScenario {
-                count: 2,
-                specify_mnemonic: false,
-                key_derivation_path_offset: 0,
-                disabled: vec![],
-            })
-            .await
-            .assert_enabled_validators_count(2)
-            .assert_validators_count(2)
-            .test_sign_voluntary_exits(0, None)
-            .await
-            .test_sign_voluntary_exits(0, Some(Epoch::new(256)))
-            .await;
-    });
+#[tokio::test]
+async fn validator_exit() {
+    ApiTester::new()
+        .await
+        .create_hd_validators(HdValidatorScenario {
+            count: 2,
+            specify_mnemonic: false,
+            key_derivation_path_offset: 0,
+            disabled: vec![],
+        })
+        .await
+        .assert_enabled_validators_count(2)
+        .assert_validators_count(2)
+        .test_sign_voluntary_exits(0, None)
+        .await
+        .test_sign_voluntary_exits(0, Some(Epoch::new(256)))
+        .await;
 }
 
-#[test]
-fn validator_enabling() {
-    let runtime = build_runtime();
-    let weak_runtime = Arc::downgrade(&runtime);
-    runtime.block_on(async {
-        ApiTester::new(weak_runtime)
-            .await
-            .create_hd_validators(HdValidatorScenario {
-                count: 2,
-                specify_mnemonic: false,
-                key_derivation_path_offset: 0,
-                disabled: vec![],
-            })
-            .await
-            .assert_enabled_validators_count(2)
-            .assert_validators_count(2)
-            .set_validator_enabled(0, false)
-            .await
-            .assert_enabled_validators_count(1)
-            .assert_validators_count(2)
-            .set_validator_enabled(0, true)
-            .await
-            .assert_enabled_validators_count(2)
-            .assert_validators_count(2);
-    });
+#[tokio::test]
+async fn validator_enabling() {
+    ApiTester::new()
+        .await
+        .create_hd_validators(HdValidatorScenario {
+            count: 2,
+            specify_mnemonic: false,
+            key_derivation_path_offset: 0,
+            disabled: vec![],
+        })
+        .await
+        .assert_enabled_validators_count(2)
+        .assert_validators_count(2)
+        .set_validator_enabled(0, false)
+        .await
+        .assert_enabled_validators_count(1)
+        .assert_validators_count(2)
+        .set_validator_enabled(0, true)
+        .await
+        .assert_enabled_validators_count(2)
+        .assert_validators_count(2);
 }
 
-#[test]
-fn validator_gas_limit() {
-    let runtime = build_runtime();
-    let weak_runtime = Arc::downgrade(&runtime);
-    runtime.block_on(async {
-        ApiTester::new(weak_runtime)
-            .await
-            .create_hd_validators(HdValidatorScenario {
-                count: 2,
-                specify_mnemonic: false,
-                key_derivation_path_offset: 0,
-                disabled: vec![],
-            })
-            .await
-            .assert_enabled_validators_count(2)
-            .assert_validators_count(2)
-            .set_gas_limit(0, 500)
-            .await
-            .assert_gas_limit(0, 500)
-            .await
-            // Update gas limit while validator is disabled.
-            .set_validator_enabled(0, false)
-            .await
-            .assert_enabled_validators_count(1)
-            .assert_validators_count(2)
-            .set_gas_limit(0, 1000)
-            .await
-            .set_validator_enabled(0, true)
-            .await
-            .assert_enabled_validators_count(2)
-            .assert_gas_limit(0, 1000)
-            .await
-    });
+#[tokio::test]
+async fn validator_gas_limit() {
+    ApiTester::new()
+        .await
+        .create_hd_validators(HdValidatorScenario {
+            count: 2,
+            specify_mnemonic: false,
+            key_derivation_path_offset: 0,
+            disabled: vec![],
+        })
+        .await
+        .assert_enabled_validators_count(2)
+        .assert_validators_count(2)
+        .set_gas_limit(0, 500)
+        .await
+        .assert_gas_limit(0, 500)
+        .await
+        // Update gas limit while validator is disabled.
+        .set_validator_enabled(0, false)
+        .await
+        .assert_enabled_validators_count(1)
+        .assert_validators_count(2)
+        .set_gas_limit(0, 1000)
+        .await
+        .set_validator_enabled(0, true)
+        .await
+        .assert_enabled_validators_count(2)
+        .assert_gas_limit(0, 1000)
+        .await;
 }
 
-#[test]
-fn validator_builder_proposals() {
-    let runtime = build_runtime();
-    let weak_runtime = Arc::downgrade(&runtime);
-    runtime.block_on(async {
-        ApiTester::new(weak_runtime)
-            .await
-            .create_hd_validators(HdValidatorScenario {
-                count: 2,
-                specify_mnemonic: false,
-                key_derivation_path_offset: 0,
-                disabled: vec![],
-            })
-            .await
-            .assert_enabled_validators_count(2)
-            .assert_validators_count(2)
-            .set_builder_proposals(0, true)
-            .await
-            // Test setting builder proposals while the validator is disabled
-            .set_validator_enabled(0, false)
-            .await
-            .assert_enabled_validators_count(1)
-            .assert_validators_count(2)
-            .set_builder_proposals(0, false)
-            .await
-            .set_validator_enabled(0, true)
-            .await
-            .assert_enabled_validators_count(2)
-            .assert_builder_proposals(0, false)
-            .await
-    });
+#[tokio::test]
+async fn validator_builder_proposals() {
+    ApiTester::new()
+        .await
+        .create_hd_validators(HdValidatorScenario {
+            count: 2,
+            specify_mnemonic: false,
+            key_derivation_path_offset: 0,
+            disabled: vec![],
+        })
+        .await
+        .assert_enabled_validators_count(2)
+        .assert_validators_count(2)
+        .set_builder_proposals(0, true)
+        .await
+        // Test setting builder proposals while the validator is disabled
+        .set_validator_enabled(0, false)
+        .await
+        .assert_enabled_validators_count(1)
+        .assert_validators_count(2)
+        .set_builder_proposals(0, false)
+        .await
+        .set_validator_enabled(0, true)
+        .await
+        .assert_enabled_validators_count(2)
+        .assert_builder_proposals(0, false)
+        .await;
 }
 
-#[test]
-fn validator_graffiti() {
-    let runtime = build_runtime();
-    let weak_runtime = Arc::downgrade(&runtime);
-    runtime.block_on(async {
-        ApiTester::new(weak_runtime)
-            .await
-            .create_hd_validators(HdValidatorScenario {
-                count: 2,
-                specify_mnemonic: false,
-                key_derivation_path_offset: 0,
-                disabled: vec![],
-            })
-            .await
-            .assert_enabled_validators_count(2)
-            .assert_validators_count(2)
-            .set_graffiti(0, "Mr F was here")
-            .await
-            .assert_graffiti(0, "Mr F was here")
-            .await
-            // Test setting graffiti while the validator is disabled
-            .set_validator_enabled(0, false)
-            .await
-            .assert_enabled_validators_count(1)
-            .assert_validators_count(2)
-            .set_graffiti(0, "Mr F was here again")
-            .await
-            .set_validator_enabled(0, true)
-            .await
-            .assert_enabled_validators_count(2)
-            .assert_graffiti(0, "Mr F was here again")
-            .await
-    });
+#[tokio::test]
+async fn validator_graffiti() {
+    ApiTester::new()
+        .await
+        .create_hd_validators(HdValidatorScenario {
+            count: 2,
+            specify_mnemonic: false,
+            key_derivation_path_offset: 0,
+            disabled: vec![],
+        })
+        .await
+        .assert_enabled_validators_count(2)
+        .assert_validators_count(2)
+        .set_graffiti(0, "Mr F was here")
+        .await
+        .assert_graffiti(0, "Mr F was here")
+        .await
+        // Test setting graffiti while the validator is disabled
+        .set_validator_enabled(0, false)
+        .await
+        .assert_enabled_validators_count(1)
+        .assert_validators_count(2)
+        .set_graffiti(0, "Mr F was here again")
+        .await
+        .set_validator_enabled(0, true)
+        .await
+        .assert_enabled_validators_count(2)
+        .assert_graffiti(0, "Mr F was here again")
+        .await;
 }
 
-#[test]
-fn keystore_validator_creation() {
-    let runtime = build_runtime();
-    let weak_runtime = Arc::downgrade(&runtime);
-    runtime.block_on(async {
-        ApiTester::new(weak_runtime)
-            .await
-            .assert_enabled_validators_count(0)
-            .assert_validators_count(0)
-            .create_keystore_validators(KeystoreValidatorScenario {
-                correct_password: true,
-                enabled: true,
-            })
-            .await
-            .assert_enabled_validators_count(1)
-            .assert_validators_count(1)
-            .create_keystore_validators(KeystoreValidatorScenario {
-                correct_password: false,
-                enabled: true,
-            })
-            .await
-            .assert_enabled_validators_count(1)
-            .assert_validators_count(1)
-            .create_keystore_validators(KeystoreValidatorScenario {
-                correct_password: true,
-                enabled: false,
-            })
-            .await
-            .assert_enabled_validators_count(1)
-            .assert_validators_count(2);
-    });
+#[tokio::test]
+async fn keystore_validator_creation() {
+    ApiTester::new()
+        .await
+        .assert_enabled_validators_count(0)
+        .assert_validators_count(0)
+        .create_keystore_validators(KeystoreValidatorScenario {
+            correct_password: true,
+            enabled: true,
+        })
+        .await
+        .assert_enabled_validators_count(1)
+        .assert_validators_count(1)
+        .create_keystore_validators(KeystoreValidatorScenario {
+            correct_password: false,
+            enabled: true,
+        })
+        .await
+        .assert_enabled_validators_count(1)
+        .assert_validators_count(1)
+        .create_keystore_validators(KeystoreValidatorScenario {
+            correct_password: true,
+            enabled: false,
+        })
+        .await
+        .assert_enabled_validators_count(1)
+        .assert_validators_count(2);
 }
 
-#[test]
-fn web3signer_validator_creation() {
-    let runtime = build_runtime();
-    let weak_runtime = Arc::downgrade(&runtime);
-    runtime.block_on(async {
-        ApiTester::new(weak_runtime)
-            .await
-            .assert_enabled_validators_count(0)
-            .assert_validators_count(0)
-            .create_web3signer_validators(Web3SignerValidatorScenario {
-                count: 1,
-                enabled: true,
-            })
-            .await
-            .assert_enabled_validators_count(1)
-            .assert_validators_count(1);
-    });
+#[tokio::test]
+async fn web3signer_validator_creation() {
+    ApiTester::new()
+        .await
+        .assert_enabled_validators_count(0)
+        .assert_validators_count(0)
+        .create_web3signer_validators(Web3SignerValidatorScenario {
+            count: 1,
+            enabled: true,
+        })
+        .await
+        .assert_enabled_validators_count(1)
+        .assert_validators_count(1);
 }
diff --git a/validator_client/src/http_api/tests/keystores.rs b/validator_client/src/http_api/tests/keystores.rs
index 7120ee5f9f..d60872e497 100644
--- a/validator_client/src/http_api/tests/keystores.rs
+++ b/validator_client/src/http_api/tests/keystores.rs
@@ -12,6 +12,7 @@ use itertools::Itertools;
 use rand::{rngs::SmallRng, Rng, SeedableRng};
 use slashing_protection::interchange::{Interchange, InterchangeMetadata};
 use std::{collections::HashMap, path::Path};
+use tokio::runtime::Handle;
 use types::Address;
 
 fn new_keystore(password: ZeroizeString) -> Keystore {
@@ -64,31 +65,23 @@ fn remotekey_validator_with_pubkey(pubkey: PublicKey) -> SingleImportRemotekeysR
     }
 }
 
-fn run_test<F, V>(f: F)
+async fn run_test<F, V>(f: F)
 where
     F: FnOnce(ApiTester) -> V,
     V: Future<Output = ()>,
 {
-    let runtime = build_runtime();
-    let weak_runtime = Arc::downgrade(&runtime);
-    runtime.block_on(async {
-        let tester = ApiTester::new(weak_runtime).await;
-        f(tester).await
-    });
+    let tester = ApiTester::new().await;
+    f(tester).await
 }
 
-fn run_dual_vc_test<F, V>(f: F)
+async fn run_dual_vc_test<F, V>(f: F)
 where
     F: FnOnce(ApiTester, ApiTester) -> V,
     V: Future<Output = ()>,
 {
-    let runtime = build_runtime();
-    let weak_runtime = Arc::downgrade(&runtime);
-    runtime.block_on(async {
-        let tester1 = ApiTester::new(weak_runtime.clone()).await;
-        let tester2 = ApiTester::new(weak_runtime).await;
-        f(tester1, tester2).await
-    });
+    let tester1 = ApiTester::new().await;
+    let tester2 = ApiTester::new().await;
+    f(tester1, tester2).await
 }
 
 fn keystore_pubkey(keystore: &Keystore) -> PublicKeyBytes {
@@ -199,8 +192,8 @@ fn check_remotekey_delete_response(
     }
 }
 
-#[test]
-fn get_auth_no_token() {
+#[tokio::test]
+async fn get_auth_no_token() {
     run_test(|mut tester| async move {
         let _ = &tester;
         tester.client.send_authorization_header(false);
@@ -213,19 +206,21 @@ fn get_auth_no_token() {
         // The token should match the one that the client was originally initialised with.
         assert!(tester.client.api_token() == Some(&token));
     })
+    .await;
 }
 
-#[test]
-fn get_empty_keystores() {
+#[tokio::test]
+async fn get_empty_keystores() {
     run_test(|tester| async move {
         let _ = &tester;
         let res = tester.client.get_keystores().await.unwrap();
         assert_eq!(res, ListKeystoresResponse { data: vec![] });
     })
+    .await;
 }
 
-#[test]
-fn import_new_keystores() {
+#[tokio::test]
+async fn import_new_keystores() {
     run_test(|tester| async move {
         let _ = &tester;
         let password = random_password_string();
@@ -250,10 +245,11 @@ fn import_new_keystores() {
         let get_res = tester.client.get_keystores().await.unwrap();
         check_keystore_get_response(&get_res, &keystores);
     })
+    .await;
 }
 
-#[test]
-fn import_only_duplicate_keystores() {
+#[tokio::test]
+async fn import_only_duplicate_keystores() {
     run_test(|tester| async move {
         let _ = &tester;
         let password = random_password_string();
@@ -279,10 +275,11 @@ fn import_only_duplicate_keystores() {
         let get_res = tester.client.get_keystores().await.unwrap();
         check_keystore_get_response(&get_res, &keystores);
     })
+    .await;
 }
 
-#[test]
-fn import_some_duplicate_keystores() {
+#[tokio::test]
+async fn import_some_duplicate_keystores() {
     run_test(|tester| async move {
         let _ = &tester;
         let password = random_password_string();
@@ -330,10 +327,11 @@ fn import_some_duplicate_keystores() {
         let import_res = tester.client.post_keystores(&req2).await.unwrap();
         check_keystore_import_response(&import_res, expected);
     })
+    .await;
 }
 
-#[test]
-fn import_wrong_number_of_passwords() {
+#[tokio::test]
+async fn import_wrong_number_of_passwords() {
     run_test(|tester| async move {
         let _ = &tester;
         let password = random_password_string();
@@ -352,10 +350,11 @@ fn import_wrong_number_of_passwords() {
             .unwrap_err();
         assert_eq!(err.status().unwrap(), 400);
     })
+    .await;
 }
 
-#[test]
-fn get_web3_signer_keystores() {
+#[tokio::test]
+async fn get_web3_signer_keystores() {
     run_test(|tester| async move {
         let _ = &tester;
         let num_local = 3;
@@ -412,10 +411,11 @@ fn get_web3_signer_keystores() {
             assert!(get_res.data.contains(&response), "{:?}", response);
         }
     })
+    .await;
 }
 
-#[test]
-fn import_and_delete_conflicting_web3_signer_keystores() {
+#[tokio::test]
+async fn import_and_delete_conflicting_web3_signer_keystores() {
     run_test(|tester| async move {
         let _ = &tester;
         let num_keystores = 3;
@@ -477,10 +477,11 @@ fn import_and_delete_conflicting_web3_signer_keystores() {
         let delete_res = tester.client.delete_keystores(&delete_req).await.unwrap();
         check_keystore_delete_response(&delete_res, all_delete_error(keystores.len()));
     })
+    .await;
 }
 
-#[test]
-fn import_keystores_wrong_password() {
+#[tokio::test]
+async fn import_keystores_wrong_password() {
     run_test(|tester| async move {
         let _ = &tester;
         let num_keystores = 4;
@@ -551,11 +552,12 @@ fn import_keystores_wrong_password() {
             &import_res,
             (0..num_keystores).map(|_| ImportKeystoreStatus::Duplicate),
         );
-    });
+    })
+    .await;
 }
 
-#[test]
-fn import_invalid_slashing_protection() {
+#[tokio::test]
+async fn import_invalid_slashing_protection() {
     run_test(|tester| async move {
         let _ = &tester;
         let password = random_password_string();
@@ -589,10 +591,11 @@ fn import_invalid_slashing_protection() {
         let get_res = tester.client.get_keystores().await.unwrap();
         check_keystore_get_response(&get_res, &[]);
     })
+    .await;
 }
 
-#[test]
-fn check_get_set_fee_recipient() {
+#[tokio::test]
+async fn check_get_set_fee_recipient() {
     run_test(|tester: ApiTester| async move {
         let _ = &tester;
         let password = random_password_string();
@@ -768,10 +771,11 @@ fn check_get_set_fee_recipient() {
             );
         }
     })
+    .await;
 }
 
-#[test]
-fn check_get_set_gas_limit() {
+#[tokio::test]
+async fn check_get_set_gas_limit() {
     run_test(|tester: ApiTester| async move {
         let _ = &tester;
         let password = random_password_string();
@@ -943,14 +947,15 @@ fn check_get_set_gas_limit() {
             );
         }
     })
+    .await
 }
 
 fn all_indices(count: usize) -> Vec<usize> {
     (0..count).collect()
 }
 
-#[test]
-fn migrate_all_with_slashing_protection() {
+#[tokio::test]
+async fn migrate_all_with_slashing_protection() {
     let n = 3;
     generic_migration_test(
         n,
@@ -967,11 +972,12 @@ fn migrate_all_with_slashing_protection() {
             (1, make_attestation(2, 3), false),
             (2, make_attestation(1, 2), false),
         ],
-    );
+    )
+    .await;
 }
 
-#[test]
-fn migrate_some_with_slashing_protection() {
+#[tokio::test]
+async fn migrate_some_with_slashing_protection() {
     let n = 3;
     generic_migration_test(
         n,
@@ -989,11 +995,12 @@ fn migrate_some_with_slashing_protection() {
             (0, make_attestation(2, 3), true),
             (1, make_attestation(3, 4), true),
         ],
-    );
+    )
+    .await;
 }
 
-#[test]
-fn migrate_some_missing_slashing_protection() {
+#[tokio::test]
+async fn migrate_some_missing_slashing_protection() {
     let n = 3;
     generic_migration_test(
         n,
@@ -1010,11 +1017,12 @@ fn migrate_some_missing_slashing_protection() {
             (1, make_attestation(2, 3), true),
             (0, make_attestation(2, 3), true),
         ],
-    );
+    )
+    .await;
 }
 
-#[test]
-fn migrate_some_extra_slashing_protection() {
+#[tokio::test]
+async fn migrate_some_extra_slashing_protection() {
     let n = 3;
     generic_migration_test(
         n,
@@ -1033,7 +1041,8 @@ fn migrate_some_extra_slashing_protection() {
             (1, make_attestation(3, 4), true),
             (2, make_attestation(2, 3), false),
         ],
-    );
+    )
+    .await;
 }
 
 /// Run a test that creates some validators on one VC, and then migrates them to a second VC.
@@ -1051,7 +1060,7 @@ fn migrate_some_extra_slashing_protection() {
 /// - `import_indices`: validators to transfer. It needn't be a subset of `delete_indices`.
 /// - `second_vc_attestations`: attestations to sign on the second VC after the transfer. The bool
 ///   indicates whether the signing should be successful.
-fn generic_migration_test(
+async fn generic_migration_test(
     num_validators: usize,
     first_vc_attestations: Vec<(usize, Attestation<E>)>,
     delete_indices: Vec<usize>,
@@ -1169,11 +1178,12 @@ fn generic_migration_test(
                 Err(e) => assert!(!should_succeed, "{:?}", e),
             }
         }
-    });
+    })
+    .await
 }
 
-#[test]
-fn delete_keystores_twice() {
+#[tokio::test]
+async fn delete_keystores_twice() {
     run_test(|tester| async move {
         let _ = &tester;
         let password = random_password_string();
@@ -1201,10 +1211,11 @@ fn delete_keystores_twice() {
         let delete_res = tester.client.delete_keystores(&delete_req).await.unwrap();
         check_keystore_delete_response(&delete_res, all_not_active(keystores.len()));
     })
+    .await
 }
 
-#[test]
-fn delete_nonexistent_keystores() {
+#[tokio::test]
+async fn delete_nonexistent_keystores() {
     run_test(|tester| async move {
         let _ = &tester;
         let password = random_password_string();
@@ -1219,6 +1230,7 @@ fn delete_nonexistent_keystores() {
         let delete_res = tester.client.delete_keystores(&delete_req).await.unwrap();
         check_keystore_delete_response(&delete_res, all_not_found(keystores.len()));
     })
+    .await
 }
 
 fn make_attestation(source_epoch: u64, target_epoch: u64) -> Attestation<E> {
@@ -1242,9 +1254,9 @@ fn make_attestation(source_epoch: u64, target_epoch: u64) -> Attestation<E> {
     }
 }
 
-#[test]
-fn delete_concurrent_with_signing() {
-    let runtime = build_runtime();
+#[tokio::test]
+async fn delete_concurrent_with_signing() {
+    let handle = Handle::try_current().unwrap();
     let num_keys = 8;
     let num_signing_threads = 8;
     let num_attestations = 100;
@@ -1257,115 +1269,112 @@ fn delete_concurrent_with_signing() {
         "num_keys should be divisible by num threads for simplicity"
     );
 
-    let weak_runtime = Arc::downgrade(&runtime);
-    runtime.block_on(async {
-        let tester = ApiTester::new(weak_runtime).await;
+    let tester = ApiTester::new().await;
 
-        // Generate a lot of keys and import them.
-        let password = random_password_string();
-        let keystores = (0..num_keys)
-            .map(|_| new_keystore(password.clone()))
-            .collect::<Vec<_>>();
-        let all_pubkeys = keystores.iter().map(keystore_pubkey).collect::<Vec<_>>();
+    // Generate a lot of keys and import them.
+    let password = random_password_string();
+    let keystores = (0..num_keys)
+        .map(|_| new_keystore(password.clone()))
+        .collect::<Vec<_>>();
+    let all_pubkeys = keystores.iter().map(keystore_pubkey).collect::<Vec<_>>();
 
-        let import_res = tester
-            .client
-            .post_keystores(&ImportKeystoresRequest {
-                keystores: keystores.clone(),
-                passwords: vec![password.clone(); keystores.len()],
-                slashing_protection: None,
-            })
-            .await
-            .unwrap();
-        check_keystore_import_response(&import_res, all_imported(keystores.len()));
+    let import_res = tester
+        .client
+        .post_keystores(&ImportKeystoresRequest {
+            keystores: keystores.clone(),
+            passwords: vec![password.clone(); keystores.len()],
+            slashing_protection: None,
+        })
+        .await
+        .unwrap();
+    check_keystore_import_response(&import_res, all_imported(keystores.len()));
 
-        // Start several threads signing attestations at sequential epochs.
-        let mut join_handles = vec![];
+    // Start several threads signing attestations at sequential epochs.
+    let mut join_handles = vec![];
 
-        for thread_index in 0..num_signing_threads {
-            let keys_per_thread = num_keys / num_signing_threads;
-            let validator_store = tester.validator_store.clone();
-            let thread_pubkeys = all_pubkeys
-                [thread_index * keys_per_thread..(thread_index + 1) * keys_per_thread]
-                .to_vec();
+    for thread_index in 0..num_signing_threads {
+        let keys_per_thread = num_keys / num_signing_threads;
+        let validator_store = tester.validator_store.clone();
+        let thread_pubkeys = all_pubkeys
+            [thread_index * keys_per_thread..(thread_index + 1) * keys_per_thread]
+            .to_vec();
 
-            let handle = runtime.spawn(async move {
-                for j in 0..num_attestations {
-                    let mut att = make_attestation(j, j + 1);
-                    for (_validator_id, public_key) in thread_pubkeys.iter().enumerate() {
-                        let _ = validator_store
-                            .sign_attestation(*public_key, 0, &mut att, Epoch::new(j + 1))
-                            .await;
-                    }
+        let handle = handle.spawn(async move {
+            for j in 0..num_attestations {
+                let mut att = make_attestation(j, j + 1);
+                for (_validator_id, public_key) in thread_pubkeys.iter().enumerate() {
+                    let _ = validator_store
+                        .sign_attestation(*public_key, 0, &mut att, Epoch::new(j + 1))
+                        .await;
                 }
-            });
-            join_handles.push(handle);
-        }
-
-        // Concurrently, delete each validator one at a time. Store the slashing protection
-        // data so we can ensure it doesn't change after a key is exported.
-        let mut delete_handles = vec![];
-        for _ in 0..num_delete_threads {
-            let client = tester.client.clone();
-            let all_pubkeys = all_pubkeys.clone();
-
-            let handle = runtime.spawn(async move {
-                let mut rng = SmallRng::from_entropy();
-
-                let mut slashing_protection = vec![];
-                for _ in 0..num_delete_attempts {
-                    let to_delete = all_pubkeys
-                        .iter()
-                        .filter(|_| rng.gen_bool(delete_prob))
-                        .copied()
-                        .collect::<Vec<_>>();
-
-                    if !to_delete.is_empty() {
-                        let delete_res = client
-                            .delete_keystores(&DeleteKeystoresRequest { pubkeys: to_delete })
-                            .await
-                            .unwrap();
-
-                        for status in delete_res.data.iter() {
-                            assert_ne!(status.status, DeleteKeystoreStatus::Error);
-                        }
-
-                        slashing_protection.push(delete_res.slashing_protection);
-                    }
-                }
-                slashing_protection
-            });
-
-            delete_handles.push(handle);
-        }
-
-        // Collect slashing protection.
-        let mut slashing_protection_map = HashMap::new();
-        let collected_slashing_protection = futures::future::join_all(delete_handles).await;
-
-        for interchange in collected_slashing_protection
-            .into_iter()
-            .flat_map(Result::unwrap)
-        {
-            for validator_data in interchange.data {
-                slashing_protection_map
-                    .entry(validator_data.pubkey)
-                    .and_modify(|existing| {
-                        assert_eq!(
-                            *existing, validator_data,
-                            "slashing protection data changed after first export"
-                        )
-                    })
-                    .or_insert(validator_data);
             }
-        }
+        });
+        join_handles.push(handle);
+    }
 
-        futures::future::join_all(join_handles).await
-    });
+    // Concurrently, delete each validator one at a time. Store the slashing protection
+    // data so we can ensure it doesn't change after a key is exported.
+    let mut delete_handles = vec![];
+    for _ in 0..num_delete_threads {
+        let client = tester.client.clone();
+        let all_pubkeys = all_pubkeys.clone();
+
+        let handle = handle.spawn(async move {
+            let mut rng = SmallRng::from_entropy();
+
+            let mut slashing_protection = vec![];
+            for _ in 0..num_delete_attempts {
+                let to_delete = all_pubkeys
+                    .iter()
+                    .filter(|_| rng.gen_bool(delete_prob))
+                    .copied()
+                    .collect::<Vec<_>>();
+
+                if !to_delete.is_empty() {
+                    let delete_res = client
+                        .delete_keystores(&DeleteKeystoresRequest { pubkeys: to_delete })
+                        .await
+                        .unwrap();
+
+                    for status in delete_res.data.iter() {
+                        assert_ne!(status.status, DeleteKeystoreStatus::Error);
+                    }
+
+                    slashing_protection.push(delete_res.slashing_protection);
+                }
+            }
+            slashing_protection
+        });
+
+        delete_handles.push(handle);
+    }
+
+    // Collect slashing protection.
+    let mut slashing_protection_map = HashMap::new();
+    let collected_slashing_protection = futures::future::join_all(delete_handles).await;
+
+    for interchange in collected_slashing_protection
+        .into_iter()
+        .flat_map(Result::unwrap)
+    {
+        for validator_data in interchange.data {
+            slashing_protection_map
+                .entry(validator_data.pubkey)
+                .and_modify(|existing| {
+                    assert_eq!(
+                        *existing, validator_data,
+                        "slashing protection data changed after first export"
+                    )
+                })
+                .or_insert(validator_data);
+        }
+    }
+
+    futures::future::join_all(join_handles).await;
 }
 
-#[test]
-fn delete_then_reimport() {
+#[tokio::test]
+async fn delete_then_reimport() {
     run_test(|tester| async move {
         let _ = &tester;
         let password = random_password_string();
@@ -1396,19 +1405,21 @@ fn delete_then_reimport() {
         let import_res = tester.client.post_keystores(&import_req).await.unwrap();
         check_keystore_import_response(&import_res, all_imported(keystores.len()));
     })
+    .await
 }
 
-#[test]
-fn get_empty_remotekeys() {
+#[tokio::test]
+async fn get_empty_remotekeys() {
     run_test(|tester| async move {
         let _ = &tester;
         let res = tester.client.get_remotekeys().await.unwrap();
         assert_eq!(res, ListRemotekeysResponse { data: vec![] });
     })
+    .await
 }
 
-#[test]
-fn import_new_remotekeys() {
+#[tokio::test]
+async fn import_new_remotekeys() {
     run_test(|tester| async move {
         let _ = &tester;
 
@@ -1443,10 +1454,11 @@ fn import_new_remotekeys() {
         let get_res = tester.client.get_remotekeys().await.unwrap();
         check_remotekey_get_response(&get_res, expected_responses);
     })
+    .await
 }
 
-#[test]
-fn import_same_remotekey_different_url() {
+#[tokio::test]
+async fn import_same_remotekey_different_url() {
     run_test(|tester| async move {
         let _ = &tester;
 
@@ -1485,10 +1497,11 @@ fn import_same_remotekey_different_url() {
             }],
         );
     })
+    .await
 }
 
-#[test]
-fn delete_remotekey_then_reimport_different_url() {
+#[tokio::test]
+async fn delete_remotekey_then_reimport_different_url() {
     run_test(|tester| async move {
         let _ = &tester;
 
@@ -1534,10 +1547,11 @@ fn delete_remotekey_then_reimport_different_url() {
             vec![ImportRemotekeyStatus::Imported].into_iter(),
         );
     })
+    .await
 }
 
-#[test]
-fn import_only_duplicate_remotekeys() {
+#[tokio::test]
+async fn import_only_duplicate_remotekeys() {
     run_test(|tester| async move {
         let _ = &tester;
         let remotekeys = (0..3)
@@ -1582,10 +1596,11 @@ fn import_only_duplicate_remotekeys() {
         let get_res = tester.client.get_remotekeys().await.unwrap();
         check_remotekey_get_response(&get_res, expected_responses);
     })
+    .await
 }
 
-#[test]
-fn import_some_duplicate_remotekeys() {
+#[tokio::test]
+async fn import_some_duplicate_remotekeys() {
     run_test(|tester| async move {
         let _ = &tester;
         let num_remotekeys = 5;
@@ -1649,10 +1664,11 @@ fn import_some_duplicate_remotekeys() {
         let get_res = tester.client.get_remotekeys().await.unwrap();
         check_remotekey_get_response(&get_res, expected_responses);
     })
+    .await
 }
 
-#[test]
-fn import_remote_and_local_keys() {
+#[tokio::test]
+async fn import_remote_and_local_keys() {
     run_test(|tester| async move {
         let _ = &tester;
         let num_local = 3;
@@ -1714,10 +1730,11 @@ fn import_remote_and_local_keys() {
             assert!(get_res.data.contains(&response), "{:?}", response);
         }
     })
+    .await
 }
 
-#[test]
-fn import_same_local_and_remote_keys() {
+#[tokio::test]
+async fn import_same_local_and_remote_keys() {
     run_test(|tester| async move {
         let _ = &tester;
         let num_local = 3;
@@ -1782,9 +1799,10 @@ fn import_same_local_and_remote_keys() {
             assert!(get_res.data.contains(&response), "{:?}", response);
         }
     })
+    .await
 }
-#[test]
-fn import_same_remote_and_local_keys() {
+#[tokio::test]
+async fn import_same_remote_and_local_keys() {
     run_test(|tester| async move {
         let _ = &tester;
         let num_local = 3;
@@ -1847,10 +1865,11 @@ fn import_same_remote_and_local_keys() {
         let get_res = tester.client.get_remotekeys().await.unwrap();
         check_remotekey_get_response(&get_res, expected_responses);
     })
+    .await
 }
 
-#[test]
-fn delete_remotekeys_twice() {
+#[tokio::test]
+async fn delete_remotekeys_twice() {
     run_test(|tester| async move {
         let _ = &tester;
 
@@ -1893,10 +1912,11 @@ fn delete_remotekeys_twice() {
         let get_res = tester.client.get_remotekeys().await.unwrap();
         check_remotekey_get_response(&get_res, Vec::new());
     })
+    .await
 }
 
-#[test]
-fn delete_nonexistent_remotekey() {
+#[tokio::test]
+async fn delete_nonexistent_remotekey() {
     run_test(|tester| async move {
         let _ = &tester;
 
@@ -1919,10 +1939,11 @@ fn delete_nonexistent_remotekey() {
         let get_res = tester.client.get_remotekeys().await.unwrap();
         check_remotekey_get_response(&get_res, Vec::new());
     })
+    .await
 }
 
-#[test]
-fn delete_then_reimport_remotekeys() {
+#[tokio::test]
+async fn delete_then_reimport_remotekeys() {
     run_test(|tester| async move {
         let _ = &tester;
 
@@ -1984,10 +2005,11 @@ fn delete_then_reimport_remotekeys() {
         let get_res = tester.client.get_remotekeys().await.unwrap();
         check_remotekey_get_response(&get_res, expected_responses);
     })
+    .await
 }
 
-#[test]
-fn import_remotekey_web3signer() {
+#[tokio::test]
+async fn import_remotekey_web3signer() {
     run_test(|tester| async move {
         let _ = &tester;
 
@@ -2043,10 +2065,11 @@ fn import_remotekey_web3signer() {
         let get_res = tester.client.get_remotekeys().await.unwrap();
         check_remotekey_get_response(&get_res, expected_responses);
     })
+    .await
 }
 
-#[test]
-fn import_remotekey_web3signer_disabled() {
+#[tokio::test]
+async fn import_remotekey_web3signer_disabled() {
     run_test(|tester| async move {
         let _ = &tester;
 
@@ -2096,10 +2119,11 @@ fn import_remotekey_web3signer_disabled() {
         let get_res = tester.client.get_remotekeys().await.unwrap();
         check_remotekey_get_response(&get_res, expected_responses);
     })
+    .await
 }
 
-#[test]
-fn import_remotekey_web3signer_enabled() {
+#[tokio::test]
+async fn import_remotekey_web3signer_enabled() {
     run_test(|tester| async move {
         let _ = &tester;
 
@@ -2156,4 +2180,5 @@ fn import_remotekey_web3signer_enabled() {
         let get_res = tester.client.get_remotekeys().await.unwrap();
         check_remotekey_get_response(&get_res, expected_responses);
     })
+    .await
 }
diff --git a/validator_client/src/http_metrics/metrics.rs b/validator_client/src/http_metrics/metrics.rs
index 8a52a4d35e..52b52126bd 100644
--- a/validator_client/src/http_metrics/metrics.rs
+++ b/validator_client/src/http_metrics/metrics.rs
@@ -29,6 +29,7 @@ pub const UPDATE_ATTESTERS_FETCH: &str = "update_attesters_fetch";
 pub const UPDATE_ATTESTERS_STORE: &str = "update_attesters_store";
 pub const ATTESTER_DUTIES_HTTP_POST: &str = "attester_duties_http_post";
 pub const PROPOSER_DUTIES_HTTP_GET: &str = "proposer_duties_http_get";
+pub const VALIDATOR_DUTIES_SYNC_HTTP_POST: &str = "validator_duties_sync_http_post";
 pub const VALIDATOR_ID_HTTP_GET: &str = "validator_id_http_get";
 pub const SUBSCRIPTIONS_HTTP_POST: &str = "subscriptions_http_post";
 pub const UPDATE_PROPOSERS: &str = "update_proposers";
diff --git a/validator_client/src/initialized_validators.rs b/validator_client/src/initialized_validators.rs
index 090acbe969..f15ea27c9b 100644
--- a/validator_client/src/initialized_validators.rs
+++ b/validator_client/src/initialized_validators.rs
@@ -8,7 +8,7 @@
 
 use crate::signing_method::SigningMethod;
 use account_utils::{
-    read_password, read_password_from_user,
+    read_password, read_password_from_user, read_password_string,
     validator_definitions::{
         self, SigningDefinition, ValidatorDefinition, ValidatorDefinitions, Web3SignerDefinition,
         CONFIG_FILENAME,
@@ -44,6 +44,19 @@ const DEFAULT_REMOTE_SIGNER_REQUEST_TIMEOUT: Duration = Duration::from_secs(12);
 // Use TTY instead of stdin to capture passwords from users.
 const USE_STDIN: bool = false;
 
+pub enum OnDecryptFailure {
+    /// If the key cache fails to decrypt, create a new cache.
+    CreateNew,
+    /// Return an error if the key cache fails to decrypt. This should only be
+    /// used in testing.
+    Error,
+}
+
+pub struct KeystoreAndPassword {
+    pub keystore: Keystore,
+    pub password: Option<ZeroizeString>,
+}
+
 #[derive(Debug)]
 pub enum Error {
     /// Refused to open a validator with an existing lockfile since that validator may be in-use by
@@ -98,6 +111,11 @@ pub enum Error {
     UnableToBuildWeb3SignerClient(ReqwestError),
     /// Unable to apply an action to a validator.
     InvalidActionOnValidator,
+    UnableToReadValidatorPassword(String),
+    UnableToReadKeystoreFile(eth2_keystore::Error),
+    UnableToSaveKeyCache(key_cache::Error),
+    UnableToDecryptKeyCache(key_cache::Error),
+    UnableToDeletePasswordFile(PathBuf, io::Error),
 }
 
 impl From<LockfileError> for Error {
@@ -539,33 +557,78 @@ impl InitializedValidators {
         &mut self,
         pubkey: &PublicKey,
         is_local_keystore: bool,
-    ) -> Result<(), Error> {
+    ) -> Result<Option<KeystoreAndPassword>, Error> {
         // 1. Disable the validator definition.
         //
         // We disable before removing so that in case of a crash the auto-discovery mechanism
         // won't re-activate the keystore.
-        if let Some(def) = self
+        let mut uuid_opt = None;
+        let mut password_path_opt = None;
+        let keystore_and_password = if let Some(def) = self
             .definitions
             .as_mut_slice()
             .iter_mut()
             .find(|def| &def.voting_public_key == pubkey)
         {
-            // Update definition for local keystore
-            if def.signing_definition.is_local_keystore() && is_local_keystore {
-                def.enabled = false;
-                self.definitions
-                    .save(&self.validators_dir)
-                    .map_err(Error::UnableToSaveDefinitions)?;
-            } else if !def.signing_definition.is_local_keystore() && !is_local_keystore {
-                def.enabled = false;
-            } else {
-                return Err(Error::InvalidActionOnValidator);
+            match &def.signing_definition {
+                SigningDefinition::LocalKeystore {
+                    voting_keystore_path,
+                    voting_keystore_password,
+                    voting_keystore_password_path,
+                    ..
+                } if is_local_keystore => {
+                    let password = match (voting_keystore_password, voting_keystore_password_path) {
+                        (Some(password), _) => Some(password.clone()),
+                        (_, Some(path)) => {
+                            password_path_opt = Some(path.clone());
+                            read_password_string(path)
+                                .map(Option::Some)
+                                .map_err(Error::UnableToReadValidatorPassword)?
+                        }
+                        (None, None) => None,
+                    };
+                    let keystore = Keystore::from_json_file(voting_keystore_path)
+                        .map_err(Error::UnableToReadKeystoreFile)?;
+                    uuid_opt = Some(*keystore.uuid());
+
+                    def.enabled = false;
+                    self.definitions
+                        .save(&self.validators_dir)
+                        .map_err(Error::UnableToSaveDefinitions)?;
+
+                    Some(KeystoreAndPassword { keystore, password })
+                }
+                SigningDefinition::Web3Signer(_) if !is_local_keystore => {
+                    def.enabled = false;
+                    None
+                }
+                _ => return Err(Error::InvalidActionOnValidator),
             }
         } else {
             return Err(Error::ValidatorNotInitialized(pubkey.clone()));
+        };
+
+        // 2. Remove the validator from the key cache. This ensures the key
+        // cache is consistent next time the VC starts.
+        //
+        // It's not a big deal if this succeeds and something fails later in
+        // this function because the VC will self-heal from a corrupt key cache.
+        //
+        // Do this before modifying `self.validators` or deleting anything from
+        // the filesystem.
+        if let Some(uuid) = uuid_opt {
+            let key_cache = KeyCache::open_or_create(&self.validators_dir)
+                .map_err(Error::UnableToOpenKeyCache)?;
+            let mut decrypted_key_cache = self
+                .decrypt_key_cache(key_cache, &mut <_>::default(), OnDecryptFailure::CreateNew)
+                .await?;
+            decrypted_key_cache.remove(&uuid);
+            decrypted_key_cache
+                .save(&self.validators_dir)
+                .map_err(Error::UnableToSaveKeyCache)?;
         }
 
-        // 2. Delete from `self.validators`, which holds the signing method.
+        // 3. Delete from `self.validators`, which holds the signing method.
         //    Delete the keystore files.
         if let Some(initialized_validator) = self.validators.remove(&pubkey.compress()) {
             if let SigningMethod::LocalKeystore {
@@ -583,14 +646,28 @@ impl InitializedValidators {
             }
         }
 
-        // 3. Delete from validator definitions entirely.
+        // 4. Delete from validator definitions entirely.
         self.definitions
             .retain(|def| &def.voting_public_key != pubkey);
         self.definitions
             .save(&self.validators_dir)
             .map_err(Error::UnableToSaveDefinitions)?;
 
-        Ok(())
+        // 5. Delete the keystore password if it's not being used by any definition.
+        if let Some(password_path) = password_path_opt.and_then(|p| p.canonicalize().ok()) {
+            if self
+                .definitions
+                .iter_voting_keystore_password_paths()
+                // Require canonicalized paths so we can do a true equality check.
+                .filter_map(|existing| existing.canonicalize().ok())
+                .all(|existing| existing != password_path)
+            {
+                fs::remove_file(&password_path)
+                    .map_err(|e| Error::UnableToDeletePasswordFile(password_path, e))?;
+            }
+        }
+
+        Ok(keystore_and_password)
     }
 
     /// Attempt to delete the voting keystore file, or its entire validator directory.
@@ -900,10 +977,11 @@ impl InitializedValidators {
     /// filesystem accesses for keystores that are already known. In the case that a keystore
     /// from the validator definitions is not yet in this map, it will be loaded from disk and
     /// inserted into the map.
-    async fn decrypt_key_cache(
+    pub async fn decrypt_key_cache(
         &self,
         mut cache: KeyCache,
         key_stores: &mut HashMap<PathBuf, Keystore>,
+        on_failure: OnDecryptFailure,
     ) -> Result<KeyCache, Error> {
         // Read relevant key stores from the filesystem.
         let mut definitions_map = HashMap::new();
@@ -971,11 +1049,13 @@ impl InitializedValidators {
 
         //decrypt
         tokio::task::spawn_blocking(move || match cache.decrypt(passwords, public_keys) {
-            Ok(_) | Err(key_cache::Error::AlreadyDecrypted) => cache,
-            _ => KeyCache::new(),
+            Ok(_) | Err(key_cache::Error::AlreadyDecrypted) => Ok(cache),
+            _ if matches!(on_failure, OnDecryptFailure::CreateNew) => Ok(KeyCache::new()),
+            Err(e) => Err(e),
         })
         .await
-        .map_err(Error::TokioJoin)
+        .map_err(Error::TokioJoin)?
+        .map_err(Error::UnableToDecryptKeyCache)
     }
 
     /// Scans `self.definitions` and attempts to initialize and validators which are not already
@@ -1013,7 +1093,8 @@ impl InitializedValidators {
         // Only decrypt cache when there is at least one local definition.
         // Decrypting cache is a very expensive operation which is never used for web3signer.
         let mut key_cache = if has_local_definitions {
-            self.decrypt_key_cache(cache, &mut key_stores).await?
+            self.decrypt_key_cache(cache, &mut key_stores, OnDecryptFailure::CreateNew)
+                .await?
         } else {
             // Assign an empty KeyCache if all definitions are of the Web3Signer type.
             KeyCache::new()
@@ -1191,4 +1272,41 @@ impl InitializedValidators {
             val.index = Some(index);
         }
     }
+
+    /// Deletes any passwords stored in the validator definitions file and
+    /// returns a map of pubkey to deleted password.
+    ///
+    /// This should only be used for testing, it's rather destructive.
+    pub fn delete_passwords_from_validator_definitions(
+        &mut self,
+    ) -> Result<HashMap<PublicKey, ZeroizeString>, Error> {
+        let mut passwords = HashMap::default();
+
+        for def in self.definitions.as_mut_slice() {
+            match &mut def.signing_definition {
+                SigningDefinition::LocalKeystore {
+                    ref mut voting_keystore_password,
+                    ..
+                } => {
+                    if let Some(password) = voting_keystore_password.take() {
+                        passwords.insert(def.voting_public_key.clone(), password);
+                    }
+                }
+                // Remote signers don't have passwords.
+                SigningDefinition::Web3Signer { .. } => (),
+            };
+        }
+
+        self.definitions
+            .save(&self.validators_dir)
+            .map_err(Error::UnableToSaveDefinitions)?;
+
+        Ok(passwords)
+    }
+
+    /// Prefer other methods in production. Arbitrarily modifying a validator
+    /// definition manually may result in inconsistencies.
+    pub fn as_mut_slice_testing_only(&mut self) -> &mut [ValidatorDefinition] {
+        self.definitions.as_mut_slice()
+    }
 }
diff --git a/validator_client/src/key_cache.rs b/validator_client/src/key_cache.rs
index b7abaaed06..c2dd7aa8fe 100644
--- a/validator_client/src/key_cache.rs
+++ b/validator_client/src/key_cache.rs
@@ -47,6 +47,12 @@ pub struct KeyCache {
 
 type SerializedKeyMap = HashMap<Uuid, ZeroizeHash>;
 
+impl Default for KeyCache {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl KeyCache {
     pub fn new() -> Self {
         KeyCache {
diff --git a/validator_client/src/lib.rs b/validator_client/src/lib.rs
index 60943a260c..6f071055a4 100644
--- a/validator_client/src/lib.rs
+++ b/validator_client/src/lib.rs
@@ -172,9 +172,12 @@ impl<T: EthSpec> ProductionValidatorClient<T> {
             let new_validators = validator_defs
                 .discover_local_keystores(&config.validator_dir, &config.secrets_dir, &log)
                 .map_err(|e| format!("Unable to discover local validator keystores: {:?}", e))?;
-            validator_defs
-                .save(&config.validator_dir)
-                .map_err(|e| format!("Unable to update validator definitions: {:?}", e))?;
+            validator_defs.save(&config.validator_dir).map_err(|e| {
+                format!(
+                    "Provide --suggested-fee-recipient or update validator definitions: {:?}",
+                    e
+                )
+            })?;
             info!(
                 log,
                 "Completed validator discovery";
@@ -521,7 +524,7 @@ impl<T: EthSpec> ProductionValidatorClient<T> {
 
     pub fn start_service(&mut self) -> Result<(), String> {
         // We use `SLOTS_PER_EPOCH` as the capacity of the block notification channel, because
-        // we don't except notifications to be delayed by more than a single slot, let alone a
+        // we don't expect notifications to be delayed by more than a single slot, let alone a
         // whole epoch!
         let channel_capacity = T::slots_per_epoch() as usize;
         let (block_service_tx, block_service_rx) = mpsc::channel(channel_capacity);
@@ -573,6 +576,7 @@ impl<T: EthSpec> ProductionValidatorClient<T> {
                 api_secret,
                 validator_store: Some(self.validator_store.clone()),
                 validator_dir: Some(self.config.validator_dir.clone()),
+                secrets_dir: Some(self.config.secrets_dir.clone()),
                 graffiti_file: self.config.graffiti_file.clone(),
                 graffiti_flag: self.config.graffiti,
                 spec: self.context.eth2_config.spec.clone(),
@@ -623,8 +627,8 @@ async fn init_from_beacon_node<E: EthSpec>(
         let num_available = beacon_nodes.num_available().await;
         let num_total = beacon_nodes.num_total();
 
-        let proposer_available = beacon_nodes.num_available().await;
-        let proposer_total = beacon_nodes.num_total();
+        let proposer_available = proposer_nodes.num_available().await;
+        let proposer_total = proposer_nodes.num_total();
 
         if proposer_total > 0 && proposer_available == 0 {
             warn!(
diff --git a/validator_client/src/notifier.rs b/validator_client/src/notifier.rs
index 732ae68ff8..909e64a78a 100644
--- a/validator_client/src/notifier.rs
+++ b/validator_client/src/notifier.rs
@@ -94,8 +94,7 @@ async fn notify<T: SlotClock + 'static, E: EthSpec>(
             info!(
                 log,
                 "No validators present";
-                "msg" => "see `lighthouse account validator create --help` \
-                or the HTTP API documentation"
+                "msg" => "see `lighthouse vm create --help` or the HTTP API documentation"
             )
         } else if total_validators == attesting_validators {
             info!(
diff --git a/validator_client/src/preparation_service.rs b/validator_client/src/preparation_service.rs
index 7d6e1744c8..2d2221680f 100644
--- a/validator_client/src/preparation_service.rs
+++ b/validator_client/src/preparation_service.rs
@@ -1,5 +1,5 @@
 use crate::beacon_node_fallback::{BeaconNodeFallback, RequireSynced};
-use crate::validator_store::{DoppelgangerStatus, ValidatorStore};
+use crate::validator_store::{DoppelgangerStatus, Error as ValidatorStoreError, ValidatorStore};
 use crate::OfflineOnFailure;
 use bls::PublicKeyBytes;
 use environment::RuntimeContext;
@@ -442,8 +442,23 @@ impl<T: SlotClock + 'static, E: EthSpec> PreparationService<T, E> {
                     .await
                 {
                     Ok(data) => data,
+                    Err(ValidatorStoreError::UnknownPubkey(pubkey)) => {
+                        // A pubkey can be missing when a validator was recently
+                        // removed via the API.
+                        debug!(
+                            log,
+                            "Missing pubkey for registration data";
+                            "pubkey" => ?pubkey,
+                        );
+                        continue;
+                    }
                     Err(e) => {
-                        error!(log, "Unable to sign validator registration data"; "error" => ?e, "pubkey" => ?pubkey);
+                        error!(
+                            log,
+                            "Unable to sign validator registration data";
+                            "error" => ?e,
+                            "pubkey" => ?pubkey
+                        );
                         continue;
                     }
                 };
diff --git a/validator_client/src/sync_committee_service.rs b/validator_client/src/sync_committee_service.rs
index cc20cedfc6..e01bf09cf2 100644
--- a/validator_client/src/sync_committee_service.rs
+++ b/validator_client/src/sync_committee_service.rs
@@ -1,5 +1,9 @@
 use crate::beacon_node_fallback::{BeaconNodeFallback, RequireSynced};
-use crate::{duties_service::DutiesService, validator_store::ValidatorStore, OfflineOnFailure};
+use crate::{
+    duties_service::DutiesService,
+    validator_store::{Error as ValidatorStoreError, ValidatorStore},
+    OfflineOnFailure,
+};
 use environment::RuntimeContext;
 use eth2::types::BlockId;
 use futures::future::join_all;
@@ -264,6 +268,18 @@ impl<T: SlotClock + 'static, E: EthSpec> SyncCommitteeService<T, E> {
                 .await
             {
                 Ok(signature) => Some(signature),
+                Err(ValidatorStoreError::UnknownPubkey(pubkey)) => {
+                    // A pubkey can be missing when a validator was recently
+                    // removed via the API.
+                    debug!(
+                        log,
+                        "Missing pubkey for sync committee signature";
+                        "pubkey" => ?pubkey,
+                        "validator_index" => duty.validator_index,
+                        "slot" => slot,
+                    );
+                    None
+                }
                 Err(e) => {
                     crit!(
                         log,
@@ -405,6 +421,17 @@ impl<T: SlotClock + 'static, E: EthSpec> SyncCommitteeService<T, E> {
                     .await
                 {
                     Ok(signed_contribution) => Some(signed_contribution),
+                    Err(ValidatorStoreError::UnknownPubkey(pubkey)) => {
+                        // A pubkey can be missing when a validator was recently
+                        // removed via the API.
+                        debug!(
+                            log,
+                            "Missing pubkey for sync contribution";
+                            "pubkey" => ?pubkey,
+                            "slot" => slot,
+                        );
+                        None
+                    }
                     Err(e) => {
                         crit!(
                             log,
diff --git a/validator_client/src/validator_store.rs b/validator_client/src/validator_store.rs
index 73843579a2..365f7f7347 100644
--- a/validator_client/src/validator_store.rs
+++ b/validator_client/src/validator_store.rs
@@ -5,7 +5,7 @@ use crate::{
     signing_method::{Error as SigningError, SignableMessage, SigningContext, SigningMethod},
     Config,
 };
-use account_utils::{validator_definitions::ValidatorDefinition, ZeroizeString};
+use account_utils::validator_definitions::{PasswordStorage, ValidatorDefinition};
 use parking_lot::{Mutex, RwLock};
 use slashing_protection::{
     interchange::Interchange, InterchangeError, NotSafe, Safe, SlashingDatabase,
@@ -170,7 +170,7 @@ impl<T: SlotClock + 'static, E: EthSpec> ValidatorStore<T, E> {
     pub async fn add_validator_keystore<P: AsRef<Path>>(
         &self,
         voting_keystore_path: P,
-        password: ZeroizeString,
+        password_storage: PasswordStorage,
         enable: bool,
         graffiti: Option<GraffitiString>,
         suggested_fee_recipient: Option<Address>,
@@ -179,7 +179,7 @@ impl<T: SlotClock + 'static, E: EthSpec> ValidatorStore<T, E> {
     ) -> Result<ValidatorDefinition, String> {
         let mut validator_def = ValidatorDefinition::new_keystore_with_password(
             voting_keystore_path,
-            Some(password),
+            password_storage,
             graffiti.map(Into::into),
             suggested_fee_recipient,
             gas_limit,
diff --git a/validator_manager/Cargo.toml b/validator_manager/Cargo.toml
new file mode 100644
index 0000000000..851510820e
--- /dev/null
+++ b/validator_manager/Cargo.toml
@@ -0,0 +1,30 @@
+[package]
+name = "validator_manager"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+bls = { path = "../crypto/bls" }
+clap = "2.33.3"
+types = { path = "../consensus/types" }
+environment = { path = "../lighthouse/environment" }
+eth2_network_config = { path = "../common/eth2_network_config" }
+clap_utils = { path = "../common/clap_utils" }
+eth2_wallet = { path = "../crypto/eth2_wallet" }
+eth2_keystore = { path = "../crypto/eth2_keystore" }
+account_utils = { path = "../common/account_utils" }
+serde = { version = "1.0.116", features = ["derive"] }
+serde_json = "1.0.58"
+ethereum_serde_utils = "0.5.0"
+tree_hash = "0.5.0"
+eth2 = { path = "../common/eth2", features = ["lighthouse"]}
+hex = "0.4.2"
+tokio = { version = "1.14.0", features = ["time", "rt-multi-thread", "macros"] }
+
+[dev-dependencies]
+tempfile = "3.1.0"
+regex = "1.6.0"
+eth2_network_config = { path = "../common/eth2_network_config" }
+validator_client = { path = "../validator_client" }
diff --git a/validator_manager/src/common.rs b/validator_manager/src/common.rs
new file mode 100644
index 0000000000..6a3f93a3f7
--- /dev/null
+++ b/validator_manager/src/common.rs
@@ -0,0 +1,361 @@
+use account_utils::{strip_off_newlines, ZeroizeString};
+use eth2::lighthouse_vc::std_types::{InterchangeJsonStr, KeystoreJsonStr};
+use eth2::{
+    lighthouse_vc::{
+        http_client::ValidatorClientHttpClient,
+        std_types::{ImportKeystoreStatus, ImportKeystoresRequest, SingleKeystoreResponse, Status},
+        types::UpdateFeeRecipientRequest,
+    },
+    SensitiveUrl,
+};
+use serde::{Deserialize, Serialize};
+use std::fs;
+use std::path::{Path, PathBuf};
+use tree_hash::TreeHash;
+use types::*;
+
+pub const IGNORE_DUPLICATES_FLAG: &str = "ignore-duplicates";
+pub const STDIN_INPUTS_FLAG: &str = "stdin-inputs";
+pub const COUNT_FLAG: &str = "count";
+
+/// When the `ethereum/staking-deposit-cli` tool generates deposit data JSON, it adds a
+/// `deposit_cli_version` to protect the web-based "Launchpad" tool against a breaking change that
+/// was introduced in `ethereum/staking-deposit-cli`. Lighthouse don't really have a version that it
+/// can use here, so we choose a static string that is:
+///
+/// 1. High enough that it's accepted by Launchpad.
+/// 2. Weird enough to identify Lighthouse.
+const LIGHTHOUSE_DEPOSIT_CLI_VERSION: &str = "20.18.20";
+
+#[derive(Debug)]
+pub enum UploadError {
+    InvalidPublicKey,
+    DuplicateValidator(PublicKeyBytes),
+    FailedToListKeys(eth2::Error),
+    KeyUploadFailed(eth2::Error),
+    IncorrectStatusCount(usize),
+    FeeRecipientUpdateFailed(eth2::Error),
+    PatchValidatorFailed(eth2::Error),
+}
+
+#[derive(Clone, Serialize, Deserialize)]
+pub struct ValidatorSpecification {
+    pub voting_keystore: KeystoreJsonStr,
+    pub voting_keystore_password: ZeroizeString,
+    pub slashing_protection: Option<InterchangeJsonStr>,
+    pub fee_recipient: Option<Address>,
+    pub gas_limit: Option<u64>,
+    pub builder_proposals: Option<bool>,
+    pub enabled: Option<bool>,
+}
+
+impl ValidatorSpecification {
+    /// Upload the validator to a validator client via HTTP.
+    pub async fn upload(
+        self,
+        http_client: &ValidatorClientHttpClient,
+        ignore_duplicates: bool,
+    ) -> Result<Status<ImportKeystoreStatus>, UploadError> {
+        let ValidatorSpecification {
+            voting_keystore,
+            voting_keystore_password,
+            slashing_protection,
+            fee_recipient,
+            gas_limit,
+            builder_proposals,
+            enabled,
+        } = self;
+
+        let voting_public_key = voting_keystore
+            .public_key()
+            .ok_or(UploadError::InvalidPublicKey)?
+            .into();
+
+        let request = ImportKeystoresRequest {
+            keystores: vec![voting_keystore],
+            passwords: vec![voting_keystore_password],
+            slashing_protection,
+        };
+
+        // Check to see if this validator already exists on the remote validator.
+        match http_client.get_keystores().await {
+            Ok(response) => {
+                if response
+                    .data
+                    .iter()
+                    .any(|validator| validator.validating_pubkey == voting_public_key)
+                {
+                    if ignore_duplicates {
+                        eprintln!(
+                            "Duplicate validators are ignored, ignoring {:?} which exists \
+                            on the destination validator client",
+                            voting_public_key
+                        );
+                    } else {
+                        return Err(UploadError::DuplicateValidator(voting_public_key));
+                    }
+                }
+            }
+            Err(e) => {
+                return Err(UploadError::FailedToListKeys(e));
+            }
+        };
+
+        let mut statuses = http_client
+            .post_keystores(&request)
+            .await
+            .map_err(UploadError::KeyUploadFailed)?
+            .data;
+
+        let status = statuses.pop().ok_or(UploadError::IncorrectStatusCount(0))?;
+        if !statuses.is_empty() {
+            return Err(UploadError::IncorrectStatusCount(statuses.len() + 1));
+        }
+
+        // Exit early if there's an error uploading.
+        if status.status == ImportKeystoreStatus::Error {
+            return Ok(status);
+        }
+
+        if let Some(fee_recipient) = fee_recipient {
+            http_client
+                .post_fee_recipient(
+                    &voting_public_key,
+                    &UpdateFeeRecipientRequest {
+                        ethaddress: fee_recipient,
+                    },
+                )
+                .await
+                .map_err(UploadError::FeeRecipientUpdateFailed)?;
+        }
+
+        if gas_limit.is_some() || builder_proposals.is_some() || enabled.is_some() {
+            http_client
+                .patch_lighthouse_validators(
+                    &voting_public_key,
+                    enabled,
+                    gas_limit,
+                    builder_proposals,
+                    None, // Grafitti field is not maintained between validator moves.
+                )
+                .await
+                .map_err(UploadError::PatchValidatorFailed)?;
+        }
+
+        Ok(status)
+    }
+}
+
+#[derive(Serialize, Deserialize)]
+pub struct CreateSpec {
+    pub mnemonic: String,
+    pub validator_client_url: Option<SensitiveUrl>,
+    pub validator_client_token_path: Option<PathBuf>,
+    pub json_deposit_data_path: Option<PathBuf>,
+    pub ignore_duplicates: bool,
+    pub validators: Vec<ValidatorSpecification>,
+}
+
+/// The structure generated by the `staking-deposit-cli` which has become a quasi-standard for
+/// browser-based deposit submission tools (e.g., the Ethereum Launchpad and Lido).
+///
+/// We assume this code as the canonical definition:
+///
+/// https://github.com/ethereum/staking-deposit-cli/blob/76ed78224fdfe3daca788d12442b3d1a37978296/staking_deposit/credentials.py#L131-L144
+#[derive(Debug, PartialEq, Serialize, Deserialize)]
+pub struct StandardDepositDataJson {
+    #[serde(with = "public_key_bytes_without_0x_prefix")]
+    pub pubkey: PublicKeyBytes,
+    #[serde(with = "hash256_without_0x_prefix")]
+    pub withdrawal_credentials: Hash256,
+    /// The `amount` field is *not* quoted (i.e., a string) like most other `u64` fields in the
+    /// consensus specs, it's a simple integer.
+    pub amount: u64,
+    #[serde(with = "signature_bytes_without_0x_prefix")]
+    pub signature: SignatureBytes,
+    #[serde(with = "bytes_4_without_0x_prefix")]
+    pub fork_version: [u8; 4],
+    pub network_name: String,
+    #[serde(with = "hash256_without_0x_prefix")]
+    pub deposit_message_root: Hash256,
+    #[serde(with = "hash256_without_0x_prefix")]
+    pub deposit_data_root: Hash256,
+    pub deposit_cli_version: String,
+}
+
+impl StandardDepositDataJson {
+    pub fn new(
+        keypair: &Keypair,
+        withdrawal_credentials: Hash256,
+        amount: u64,
+        spec: &ChainSpec,
+    ) -> Result<Self, String> {
+        let deposit_data = {
+            let mut deposit_data = DepositData {
+                pubkey: keypair.pk.clone().into(),
+                withdrawal_credentials,
+                amount,
+                signature: SignatureBytes::empty(),
+            };
+            deposit_data.signature = deposit_data.create_signature(&keypair.sk, spec);
+            deposit_data
+        };
+
+        let deposit_message_root = deposit_data.as_deposit_message().tree_hash_root();
+        let deposit_data_root = deposit_data.tree_hash_root();
+
+        let DepositData {
+            pubkey,
+            withdrawal_credentials,
+            amount,
+            signature,
+        } = deposit_data;
+
+        Ok(Self {
+            pubkey,
+            withdrawal_credentials,
+            amount,
+            signature,
+            fork_version: spec.genesis_fork_version,
+            network_name: spec
+                .config_name
+                .clone()
+                .ok_or("The network specification does not have a CONFIG_NAME set")?,
+            deposit_message_root,
+            deposit_data_root,
+            deposit_cli_version: LIGHTHOUSE_DEPOSIT_CLI_VERSION.to_string(),
+        })
+    }
+}
+
+macro_rules! without_0x_prefix {
+    ($mod_name: ident, $type: ty) => {
+        pub mod $mod_name {
+            use super::*;
+            use std::str::FromStr;
+
+            struct Visitor;
+
+            impl<'de> serde::de::Visitor<'de> for Visitor {
+                type Value = $type;
+
+                fn expecting(&self, formatter: &mut std::fmt::Formatter) -> std::fmt::Result {
+                    formatter.write_str("ascii hex without a 0x prefix")
+                }
+
+                fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
+                where
+                    E: serde::de::Error,
+                {
+                    <$type>::from_str(&format!("0x{}", v)).map_err(serde::de::Error::custom)
+                }
+            }
+
+            /// Serialize with quotes.
+            pub fn serialize<S>(value: &$type, serializer: S) -> Result<S::Ok, S::Error>
+            where
+                S: serde::Serializer,
+            {
+                let with_prefix = format!("{:?}", value);
+                let without_prefix = with_prefix
+                    .strip_prefix("0x")
+                    .ok_or_else(|| serde::ser::Error::custom("serialization is missing 0x"))?;
+                serializer.serialize_str(&without_prefix)
+            }
+
+            /// Deserialize with quotes.
+            pub fn deserialize<'de, D>(deserializer: D) -> Result<$type, D::Error>
+            where
+                D: serde::Deserializer<'de>,
+            {
+                deserializer.deserialize_str(Visitor)
+            }
+        }
+    };
+}
+
+without_0x_prefix!(hash256_without_0x_prefix, Hash256);
+without_0x_prefix!(signature_bytes_without_0x_prefix, SignatureBytes);
+without_0x_prefix!(public_key_bytes_without_0x_prefix, PublicKeyBytes);
+
+mod bytes_4_without_0x_prefix {
+    use serde::de::Error;
+
+    const BYTES_LEN: usize = 4;
+
+    pub fn serialize<S>(bytes: &[u8; BYTES_LEN], serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: serde::Serializer,
+    {
+        let hex_string = &hex::encode(bytes);
+        serializer.serialize_str(hex_string)
+    }
+
+    pub fn deserialize<'de, D>(deserializer: D) -> Result<[u8; BYTES_LEN], D::Error>
+    where
+        D: serde::Deserializer<'de>,
+    {
+        let decoded = deserializer.deserialize_str(serde_utils::hex::HexVisitor)?;
+
+        if decoded.len() != BYTES_LEN {
+            return Err(D::Error::custom(format!(
+                "expected {} bytes for array, got {}",
+                BYTES_LEN,
+                decoded.len()
+            )));
+        }
+
+        let mut array = [0; BYTES_LEN];
+        array.copy_from_slice(&decoded);
+        Ok(array)
+    }
+}
+
+pub async fn vc_http_client<P: AsRef<Path>>(
+    url: SensitiveUrl,
+    token_path: P,
+) -> Result<(ValidatorClientHttpClient, Vec<SingleKeystoreResponse>), String> {
+    let token_path = token_path.as_ref();
+    let token_bytes =
+        fs::read(token_path).map_err(|e| format!("Failed to read {:?}: {:?}", token_path, e))?;
+    let token_string = String::from_utf8(strip_off_newlines(token_bytes))
+        .map_err(|e| format!("Failed to parse {:?} as utf8: {:?}", token_path, e))?;
+    let http_client = ValidatorClientHttpClient::new(url.clone(), token_string).map_err(|e| {
+        format!(
+            "Could not instantiate HTTP client from URL and secret: {:?}",
+            e
+        )
+    })?;
+
+    // Perform a request to check that the connection works
+    let remote_keystores = http_client
+        .get_keystores()
+        .await
+        .map_err(|e| format!("Failed to list keystores on VC: {:?}", e))?
+        .data;
+
+    eprintln!(
+        "Validator client is reachable at {} and reports {} validators",
+        url,
+        remote_keystores.len()
+    );
+
+    Ok((http_client, remote_keystores))
+}
+
+/// Write some object to a file as JSON.
+///
+/// The file must be created new, it must not already exist.
+pub fn write_to_json_file<P: AsRef<Path>, S: Serialize>(
+    path: P,
+    contents: &S,
+) -> Result<(), String> {
+    eprintln!("Writing {:?}", path.as_ref());
+    let mut file = fs::OpenOptions::new()
+        .write(true)
+        .create_new(true)
+        .open(&path)
+        .map_err(|e| format!("Failed to open {:?}: {:?}", path.as_ref(), e))?;
+    serde_json::to_writer(&mut file, contents)
+        .map_err(|e| format!("Failed to write JSON to {:?}: {:?}", path.as_ref(), e))
+}
diff --git a/validator_manager/src/create_validators.rs b/validator_manager/src/create_validators.rs
new file mode 100644
index 0000000000..8ea740ff5b
--- /dev/null
+++ b/validator_manager/src/create_validators.rs
@@ -0,0 +1,934 @@
+use super::common::*;
+use crate::DumpConfig;
+use account_utils::{random_password_string, read_mnemonic_from_cli, read_password_from_user};
+use clap::{App, Arg, ArgMatches};
+use eth2::{
+    lighthouse_vc::std_types::KeystoreJsonStr,
+    types::{StateId, ValidatorId},
+    BeaconNodeHttpClient, SensitiveUrl, Timeouts,
+};
+use eth2_wallet::WalletBuilder;
+use serde::{Deserialize, Serialize};
+use std::fs;
+use std::path::PathBuf;
+use std::time::Duration;
+use types::*;
+
+pub const CMD: &str = "create";
+pub const OUTPUT_PATH_FLAG: &str = "output-path";
+pub const DEPOSIT_GWEI_FLAG: &str = "deposit-gwei";
+pub const DISABLE_DEPOSITS_FLAG: &str = "disable-deposits";
+pub const FIRST_INDEX_FLAG: &str = "first-index";
+pub const MNEMONIC_FLAG: &str = "mnemonic-path";
+pub const SPECIFY_VOTING_KEYSTORE_PASSWORD_FLAG: &str = "specify-voting-keystore-password";
+pub const ETH1_WITHDRAWAL_ADDRESS_FLAG: &str = "eth1-withdrawal-address";
+pub const GAS_LIMIT_FLAG: &str = "gas-limit";
+pub const FEE_RECIPIENT_FLAG: &str = "suggested-fee-recipient";
+pub const BUILDER_PROPOSALS_FLAG: &str = "builder-proposals";
+pub const BEACON_NODE_FLAG: &str = "beacon-node";
+pub const FORCE_BLS_WITHDRAWAL_CREDENTIALS: &str = "force-bls-withdrawal-credentials";
+
+pub const VALIDATORS_FILENAME: &str = "validators.json";
+pub const DEPOSITS_FILENAME: &str = "deposits.json";
+
+const BEACON_NODE_HTTP_TIMEOUT: Duration = Duration::from_secs(2);
+
+pub fn cli_app<'a, 'b>() -> App<'a, 'b> {
+    App::new(CMD)
+        .about(
+            "Creates new validators from BIP-39 mnemonic. A JSON file will be created which \
+                contains all the validator keystores and other validator data. This file can then \
+                be imported to a validator client using the \"import-validators\" command. \
+                Another, optional JSON file is created which contains a list of validator \
+                deposits in the same format as the \"ethereum/staking-deposit-cli\" tool.",
+        )
+        .arg(
+            Arg::with_name(OUTPUT_PATH_FLAG)
+                .long(OUTPUT_PATH_FLAG)
+                .value_name("DIRECTORY")
+                .help(
+                    "The path to a directory where the validator and (optionally) deposits \
+                    files will be created. The directory will be created if it does not exist.",
+                )
+                .required(true)
+                .takes_value(true),
+        )
+        .arg(
+            Arg::with_name(DEPOSIT_GWEI_FLAG)
+                .long(DEPOSIT_GWEI_FLAG)
+                .value_name("DEPOSIT_GWEI")
+                .help(
+                    "The GWEI value of the deposit amount. Defaults to the minimum amount \
+                    required for an active validator (MAX_EFFECTIVE_BALANCE)",
+                )
+                .conflicts_with(DISABLE_DEPOSITS_FLAG)
+                .takes_value(true),
+        )
+        .arg(
+            Arg::with_name(FIRST_INDEX_FLAG)
+                .long(FIRST_INDEX_FLAG)
+                .value_name("FIRST_INDEX")
+                .help("The first of consecutive key indexes you wish to create.")
+                .takes_value(true)
+                .required(false)
+                .default_value("0"),
+        )
+        .arg(
+            Arg::with_name(COUNT_FLAG)
+                .long(COUNT_FLAG)
+                .value_name("VALIDATOR_COUNT")
+                .help("The number of validators to create, regardless of how many already exist")
+                .conflicts_with("at-most")
+                .takes_value(true),
+        )
+        .arg(
+            Arg::with_name(MNEMONIC_FLAG)
+                .long(MNEMONIC_FLAG)
+                .value_name("MNEMONIC_PATH")
+                .help("If present, the mnemonic will be read in from this file.")
+                .takes_value(true),
+        )
+        .arg(
+            Arg::with_name(STDIN_INPUTS_FLAG)
+                .takes_value(false)
+                .hidden(cfg!(windows))
+                .long(STDIN_INPUTS_FLAG)
+                .help("If present, read all user inputs from stdin instead of tty."),
+        )
+        .arg(
+            Arg::with_name(DISABLE_DEPOSITS_FLAG)
+                .long(DISABLE_DEPOSITS_FLAG)
+                .help(
+                    "When provided don't generate the deposits JSON file that is \
+                    commonly used for submitting validator deposits via a web UI. \
+                    Using this flag will save several seconds per validator if the \
+                    user has an alternate strategy for submitting deposits.",
+                ),
+        )
+        .arg(
+            Arg::with_name(SPECIFY_VOTING_KEYSTORE_PASSWORD_FLAG)
+                .long(SPECIFY_VOTING_KEYSTORE_PASSWORD_FLAG)
+                .help(
+                    "If present, the user will be prompted to enter the voting keystore \
+                    password that will be used to encrypt the voting keystores. If this \
+                    flag is not provided, a random password will be used. It is not \
+                    necessary to keep backups of voting keystore passwords if the \
+                    mnemonic is safely backed up.",
+                ),
+        )
+        .arg(
+            Arg::with_name(ETH1_WITHDRAWAL_ADDRESS_FLAG)
+                .long(ETH1_WITHDRAWAL_ADDRESS_FLAG)
+                .value_name("ETH1_ADDRESS")
+                .help(
+                    "If this field is set, the given eth1 address will be used to create the \
+                    withdrawal credentials. Otherwise, it will generate withdrawal credentials \
+                    with the mnemonic-derived withdrawal public key in EIP-2334 format.",
+                )
+                .conflicts_with(DISABLE_DEPOSITS_FLAG)
+                .takes_value(true),
+        )
+        .arg(
+            Arg::with_name(GAS_LIMIT_FLAG)
+                .long(GAS_LIMIT_FLAG)
+                .value_name("UINT64")
+                .help(
+                    "All created validators will use this gas limit. It is recommended \
+                    to leave this as the default value by not specifying this flag.",
+                )
+                .required(false)
+                .takes_value(true),
+        )
+        .arg(
+            Arg::with_name(FEE_RECIPIENT_FLAG)
+                .long(FEE_RECIPIENT_FLAG)
+                .value_name("ETH1_ADDRESS")
+                .help(
+                    "All created validators will use this value for the suggested \
+                    fee recipient. Omit this flag to use the default value from the VC.",
+                )
+                .required(false)
+                .takes_value(true),
+        )
+        .arg(
+            Arg::with_name(BUILDER_PROPOSALS_FLAG)
+                .long(BUILDER_PROPOSALS_FLAG)
+                .help(
+                    "When provided, all created validators will attempt to create \
+                    blocks via builder rather than the local EL.",
+                )
+                .required(false)
+                .possible_values(&["true", "false"])
+                .takes_value(true),
+        )
+        .arg(
+            Arg::with_name(BEACON_NODE_FLAG)
+                .long(BEACON_NODE_FLAG)
+                .value_name("HTTP_ADDRESS")
+                .help(
+                    "A HTTP(S) address of a beacon node using the beacon-API. \
+                    If this value is provided, an error will be raised if any validator \
+                    key here is already known as a validator by that beacon node. This helps \
+                    prevent the same validator being created twice and therefore slashable \
+                    conditions.",
+                )
+                .takes_value(true),
+        )
+        .arg(
+            Arg::with_name(FORCE_BLS_WITHDRAWAL_CREDENTIALS)
+                .takes_value(false)
+                .long(FORCE_BLS_WITHDRAWAL_CREDENTIALS)
+                .help(
+                    "If present, allows BLS withdrawal credentials rather than an execution \
+                    address. This is not recommended.",
+                ),
+        )
+}
+
+/// The CLI arguments are parsed into this struct before running the application. This step of
+/// indirection allows for testing the underlying logic without needing to parse CLI arguments.
+#[derive(Clone, PartialEq, Debug, Serialize, Deserialize)]
+pub struct CreateConfig {
+    pub output_path: PathBuf,
+    pub first_index: u32,
+    pub count: u32,
+    pub deposit_gwei: u64,
+    pub mnemonic_path: Option<PathBuf>,
+    pub stdin_inputs: bool,
+    pub disable_deposits: bool,
+    pub specify_voting_keystore_password: bool,
+    pub eth1_withdrawal_address: Option<Address>,
+    pub builder_proposals: Option<bool>,
+    pub fee_recipient: Option<Address>,
+    pub gas_limit: Option<u64>,
+    pub bn_url: Option<SensitiveUrl>,
+    pub force_bls_withdrawal_credentials: bool,
+}
+
+impl CreateConfig {
+    fn from_cli(matches: &ArgMatches, spec: &ChainSpec) -> Result<Self, String> {
+        Ok(Self {
+            output_path: clap_utils::parse_required(matches, OUTPUT_PATH_FLAG)?,
+            deposit_gwei: clap_utils::parse_optional(matches, DEPOSIT_GWEI_FLAG)?
+                .unwrap_or(spec.max_effective_balance),
+            first_index: clap_utils::parse_required(matches, FIRST_INDEX_FLAG)?,
+            count: clap_utils::parse_required(matches, COUNT_FLAG)?,
+            mnemonic_path: clap_utils::parse_optional(matches, MNEMONIC_FLAG)?,
+            stdin_inputs: cfg!(windows) || matches.is_present(STDIN_INPUTS_FLAG),
+            disable_deposits: matches.is_present(DISABLE_DEPOSITS_FLAG),
+            specify_voting_keystore_password: matches
+                .is_present(SPECIFY_VOTING_KEYSTORE_PASSWORD_FLAG),
+            eth1_withdrawal_address: clap_utils::parse_optional(
+                matches,
+                ETH1_WITHDRAWAL_ADDRESS_FLAG,
+            )?,
+            builder_proposals: clap_utils::parse_optional(matches, BUILDER_PROPOSALS_FLAG)?,
+            fee_recipient: clap_utils::parse_optional(matches, FEE_RECIPIENT_FLAG)?,
+            gas_limit: clap_utils::parse_optional(matches, GAS_LIMIT_FLAG)?,
+            bn_url: clap_utils::parse_optional(matches, BEACON_NODE_FLAG)?,
+            force_bls_withdrawal_credentials: matches.is_present(FORCE_BLS_WITHDRAWAL_CREDENTIALS),
+        })
+    }
+}
+
+struct ValidatorsAndDeposits {
+    validators: Vec<ValidatorSpecification>,
+    deposits: Option<Vec<StandardDepositDataJson>>,
+}
+
+impl ValidatorsAndDeposits {
+    async fn new<'a, T: EthSpec>(config: CreateConfig, spec: &ChainSpec) -> Result<Self, String> {
+        let CreateConfig {
+            // The output path is handled upstream.
+            output_path: _,
+            first_index,
+            count,
+            deposit_gwei,
+            mnemonic_path,
+            stdin_inputs,
+            disable_deposits,
+            specify_voting_keystore_password,
+            eth1_withdrawal_address,
+            builder_proposals,
+            fee_recipient,
+            gas_limit,
+            bn_url,
+            force_bls_withdrawal_credentials,
+        } = config;
+
+        // Since Capella, it really doesn't make much sense to use BLS
+        // withdrawal credentials. Try to guide users away from doing so.
+        if eth1_withdrawal_address.is_none() && !force_bls_withdrawal_credentials {
+            return Err(format!(
+                "--{ETH1_WITHDRAWAL_ADDRESS_FLAG} is required. See --help for more information."
+            ));
+        }
+
+        if count == 0 {
+            return Err(format!("--{} cannot be 0", COUNT_FLAG));
+        }
+
+        let bn_http_client = if let Some(bn_url) = bn_url {
+            let bn_http_client =
+                BeaconNodeHttpClient::new(bn_url, Timeouts::set_all(BEACON_NODE_HTTP_TIMEOUT));
+
+            /*
+             * Print the version of the remote beacon node.
+             */
+            let version = bn_http_client
+                .get_node_version()
+                .await
+                .map_err(|e| format!("Failed to test connection to beacon node: {:?}", e))?
+                .data
+                .version;
+            eprintln!("Connected to beacon node running version {}", version);
+
+            /*
+             * Attempt to ensure that the beacon node is on the same network.
+             */
+            let bn_config = bn_http_client
+                .get_config_spec::<types::Config>()
+                .await
+                .map_err(|e| format!("Failed to get spec from beacon node: {:?}", e))?
+                .data;
+            if let Some(config_name) = &bn_config.config_name {
+                eprintln!("Beacon node is on {} network", config_name)
+            }
+            let bn_spec = bn_config
+                .apply_to_chain_spec::<T>(&T::default_spec())
+                .ok_or("Beacon node appears to be on an incorrect network")?;
+            if bn_spec.genesis_fork_version != spec.genesis_fork_version {
+                if let Some(config_name) = bn_spec.config_name {
+                    eprintln!("Beacon node is on {} network", config_name)
+                }
+                return Err("Beacon node appears to be on the wrong network".to_string());
+            }
+
+            Some(bn_http_client)
+        } else {
+            None
+        };
+
+        let mnemonic = read_mnemonic_from_cli(mnemonic_path, stdin_inputs)?;
+        let voting_keystore_password = if specify_voting_keystore_password {
+            eprintln!("Please enter a voting keystore password when prompted.");
+            Some(read_password_from_user(stdin_inputs)?)
+        } else {
+            None
+        };
+
+        /*
+         * Generate a wallet to be used for HD key generation.
+         */
+
+        // A random password is always appropriate for the wallet since it is ephemeral.
+        let wallet_password = random_password_string();
+        // A random password is always appropriate for the withdrawal keystore since we don't ever store
+        // it anywhere.
+        let withdrawal_keystore_password = random_password_string();
+        let mut wallet =
+            WalletBuilder::from_mnemonic(&mnemonic, wallet_password.as_ref(), "".to_string())
+                .map_err(|e| format!("Unable create seed from mnemonic: {:?}", e))?
+                .build()
+                .map_err(|e| format!("Unable to create wallet: {:?}", e))?;
+
+        /*
+         * Start deriving individual validators.
+         */
+
+        eprintln!(
+            "Starting derivation of {} keystores. Each keystore may take several seconds.",
+            count
+        );
+
+        let mut validators = Vec::with_capacity(count as usize);
+        let mut deposits = (!disable_deposits).then(Vec::new);
+
+        for (i, derivation_index) in (first_index..first_index + count).enumerate() {
+            // If the voting keystore password was not provided by the user then use a unique random
+            // string for each validator.
+            let voting_keystore_password = voting_keystore_password
+                .clone()
+                .unwrap_or_else(random_password_string);
+
+            // Set the wallet to the appropriate derivation index.
+            wallet
+                .set_nextaccount(derivation_index)
+                .map_err(|e| format!("Failure to set validator derivation index: {:?}", e))?;
+
+            // Derive the keystore from the HD wallet.
+            let keystores = wallet
+                .next_validator(
+                    wallet_password.as_ref(),
+                    voting_keystore_password.as_ref(),
+                    withdrawal_keystore_password.as_ref(),
+                )
+                .map_err(|e| format!("Failed to derive keystore {}: {:?}", i, e))?;
+            let voting_keystore = keystores.voting;
+            let voting_public_key = voting_keystore
+                .public_key()
+                .ok_or_else(|| {
+                    format!("Validator keystore at index {} is missing a public key", i)
+                })?
+                .into();
+
+            // If the user has provided a beacon node URL, check that the validator doesn't already
+            // exist in the beacon chain.
+            if let Some(bn_http_client) = &bn_http_client {
+                match bn_http_client
+                    .get_beacon_states_validator_id(
+                        StateId::Head,
+                        &ValidatorId::PublicKey(voting_public_key),
+                    )
+                    .await
+                {
+                    Ok(Some(_)) => {
+                        return Err(format!(
+                            "Validator {:?} at derivation index {} already exists in the beacon chain. \
+                            This indicates a slashing risk, be sure to never run the same validator on two \
+                            different validator clients. If you understand the risks and are certain you \
+                            wish to generate this validator again, omit the --{} flag.",
+                            voting_public_key, derivation_index, BEACON_NODE_FLAG
+                        ))?
+                    }
+                    Ok(None) => eprintln!(
+                        "{:?} was not found in the beacon chain",
+                        voting_public_key
+                    ),
+                    Err(e) => {
+                        return Err(format!(
+                            "Error checking if validator exists in beacon chain: {:?}",
+                            e
+                        ))
+                    }
+                }
+            }
+
+            if let Some(deposits) = &mut deposits {
+                // Decrypt the voting keystore so a deposit message can be signed.
+                let voting_keypair = voting_keystore
+                    .decrypt_keypair(voting_keystore_password.as_ref())
+                    .map_err(|e| format!("Failed to decrypt voting keystore {}: {:?}", i, e))?;
+
+                // Sanity check to ensure the keystore is reporting the correct public key.
+                if PublicKeyBytes::from(voting_keypair.pk.clone()) != voting_public_key {
+                    return Err(format!(
+                        "Mismatch for keystore public key and derived public key \
+                        for derivation index {}",
+                        derivation_index
+                    ));
+                }
+
+                let withdrawal_credentials =
+                    if let Some(eth1_withdrawal_address) = eth1_withdrawal_address {
+                        WithdrawalCredentials::eth1(eth1_withdrawal_address, spec)
+                    } else {
+                        // Decrypt the withdrawal keystore so withdrawal credentials can be created. It's
+                        // not strictly necessary to decrypt the keystore since we can read the pubkey
+                        // directly from the keystore. However we decrypt the keystore to be more certain
+                        // that we have access to the withdrawal keys.
+                        let withdrawal_keypair = keystores
+                            .withdrawal
+                            .decrypt_keypair(withdrawal_keystore_password.as_ref())
+                            .map_err(|e| {
+                                format!("Failed to decrypt withdrawal keystore {}: {:?}", i, e)
+                            })?;
+                        WithdrawalCredentials::bls(&withdrawal_keypair.pk, spec)
+                    };
+
+                // Create a JSON structure equivalent to the one generated by
+                // `ethereum/staking-deposit-cli`.
+                let json_deposit = StandardDepositDataJson::new(
+                    &voting_keypair,
+                    withdrawal_credentials.into(),
+                    deposit_gwei,
+                    spec,
+                )?;
+
+                deposits.push(json_deposit);
+            }
+
+            let validator = ValidatorSpecification {
+                voting_keystore: KeystoreJsonStr(voting_keystore),
+                voting_keystore_password: voting_keystore_password.clone(),
+                // New validators have no slashing protection history.
+                slashing_protection: None,
+                fee_recipient,
+                gas_limit,
+                builder_proposals,
+                // Allow the VC to choose a default "enabled" state. Since "enabled" is not part of
+                // the standard API, leaving this as `None` means we are not forced to use the
+                // non-standard API.
+                enabled: None,
+            };
+
+            eprintln!(
+                "Completed {}/{}: {:?}",
+                i.saturating_add(1),
+                count,
+                voting_public_key
+            );
+
+            validators.push(validator);
+        }
+
+        Ok(Self {
+            validators,
+            deposits,
+        })
+    }
+}
+
+pub async fn cli_run<'a, T: EthSpec>(
+    matches: &'a ArgMatches<'a>,
+    spec: &ChainSpec,
+    dump_config: DumpConfig,
+) -> Result<(), String> {
+    let config = CreateConfig::from_cli(matches, spec)?;
+    if dump_config.should_exit_early(&config)? {
+        Ok(())
+    } else {
+        run::<T>(config, spec).await
+    }
+}
+
+async fn run<'a, T: EthSpec>(config: CreateConfig, spec: &ChainSpec) -> Result<(), String> {
+    let output_path = config.output_path.clone();
+
+    if !output_path.exists() {
+        fs::create_dir(&output_path)
+            .map_err(|e| format!("Failed to create {:?} directory: {:?}", output_path, e))?;
+    } else if !output_path.is_dir() {
+        return Err(format!("{:?} must be a directory", output_path));
+    }
+
+    let validators_path = output_path.join(VALIDATORS_FILENAME);
+    if validators_path.exists() {
+        return Err(format!(
+            "{:?} already exists, refusing to overwrite",
+            validators_path
+        ));
+    }
+    let deposits_path = output_path.join(DEPOSITS_FILENAME);
+    if deposits_path.exists() {
+        return Err(format!(
+            "{:?} already exists, refusing to overwrite",
+            deposits_path
+        ));
+    }
+
+    let validators_and_deposits = ValidatorsAndDeposits::new::<T>(config, spec).await?;
+
+    eprintln!("Keystore generation complete");
+
+    write_to_json_file(&validators_path, &validators_and_deposits.validators)?;
+
+    if let Some(deposits) = &validators_and_deposits.deposits {
+        write_to_json_file(&deposits_path, deposits)?;
+    }
+
+    Ok(())
+}
+
+// The tests use crypto and are too slow in debug.
+#[cfg(not(debug_assertions))]
+#[cfg(test)]
+pub mod tests {
+    use super::*;
+    use eth2_network_config::Eth2NetworkConfig;
+    use regex::Regex;
+    use std::path::Path;
+    use std::str::FromStr;
+    use tempfile::{tempdir, TempDir};
+    use tree_hash::TreeHash;
+
+    type E = MainnetEthSpec;
+
+    const TEST_VECTOR_DEPOSIT_CLI_VERSION: &str = "2.3.0";
+
+    fn junk_execution_address() -> Option<Address> {
+        Some(Address::from_str("0x0f51bb10119727a7e5ea3538074fb341f56b09ad").unwrap())
+    }
+
+    pub struct TestBuilder {
+        spec: ChainSpec,
+        output_dir: TempDir,
+        mnemonic_dir: TempDir,
+        config: CreateConfig,
+    }
+
+    impl Default for TestBuilder {
+        fn default() -> Self {
+            Self::new(E::default_spec())
+        }
+    }
+
+    impl TestBuilder {
+        pub fn new(spec: ChainSpec) -> Self {
+            let output_dir = tempdir().unwrap();
+            let mnemonic_dir = tempdir().unwrap();
+            let mnemonic_path = mnemonic_dir.path().join("mnemonic");
+            fs::write(
+                &mnemonic_path,
+                "test test test test test test test test test test test waste",
+            )
+            .unwrap();
+
+            let config = CreateConfig {
+                output_path: output_dir.path().into(),
+                first_index: 0,
+                count: 1,
+                deposit_gwei: spec.max_effective_balance,
+                mnemonic_path: Some(mnemonic_path),
+                stdin_inputs: false,
+                disable_deposits: false,
+                specify_voting_keystore_password: false,
+                eth1_withdrawal_address: junk_execution_address(),
+                builder_proposals: None,
+                fee_recipient: None,
+                gas_limit: None,
+                bn_url: None,
+                force_bls_withdrawal_credentials: false,
+            };
+
+            Self {
+                spec,
+                output_dir,
+                mnemonic_dir,
+                config,
+            }
+        }
+
+        pub fn mutate_config<F: Fn(&mut CreateConfig)>(mut self, func: F) -> Self {
+            func(&mut self.config);
+            self
+        }
+
+        pub async fn run_test(self) -> TestResult {
+            let Self {
+                spec,
+                output_dir,
+                mnemonic_dir,
+                config,
+            } = self;
+
+            let result = run::<E>(config.clone(), &spec).await;
+
+            if result.is_ok() {
+                let validators_file_contents =
+                    fs::read_to_string(output_dir.path().join(VALIDATORS_FILENAME)).unwrap();
+                let validators: Vec<ValidatorSpecification> =
+                    serde_json::from_str(&validators_file_contents).unwrap();
+
+                assert_eq!(validators.len(), config.count as usize);
+
+                for (i, validator) in validators.iter().enumerate() {
+                    let voting_keystore = &validator.voting_keystore.0;
+                    let keypair = voting_keystore
+                        .decrypt_keypair(validator.voting_keystore_password.as_ref())
+                        .unwrap();
+                    assert_eq!(keypair.pk, voting_keystore.public_key().unwrap());
+                    assert_eq!(
+                        voting_keystore.path().unwrap(),
+                        format!("m/12381/3600/{}/0/0", config.first_index as usize + i)
+                    );
+                    assert!(validator.slashing_protection.is_none());
+                    assert_eq!(validator.fee_recipient, config.fee_recipient);
+                    assert_eq!(validator.gas_limit, config.gas_limit);
+                    assert_eq!(validator.builder_proposals, config.builder_proposals);
+                    assert_eq!(validator.enabled, None);
+                }
+
+                let deposits_path = output_dir.path().join(DEPOSITS_FILENAME);
+                if config.disable_deposits {
+                    assert!(!deposits_path.exists());
+                } else {
+                    let deposits_file_contents = fs::read_to_string(&deposits_path).unwrap();
+                    let deposits: Vec<StandardDepositDataJson> =
+                        serde_json::from_str(&deposits_file_contents).unwrap();
+
+                    assert_eq!(deposits.len(), config.count as usize);
+
+                    for (validator, deposit) in validators.iter().zip(deposits.iter()) {
+                        let validator_pubkey = validator.voting_keystore.0.public_key().unwrap();
+                        assert_eq!(deposit.pubkey, validator_pubkey.clone().into());
+                        if let Some(address) = config.eth1_withdrawal_address {
+                            assert_eq!(
+                                deposit.withdrawal_credentials.as_bytes()[0],
+                                spec.eth1_address_withdrawal_prefix_byte
+                            );
+                            assert_eq!(
+                                &deposit.withdrawal_credentials.as_bytes()[12..],
+                                address.as_bytes()
+                            );
+                        } else {
+                            assert_eq!(
+                                deposit.withdrawal_credentials.as_bytes()[0],
+                                spec.bls_withdrawal_prefix_byte
+                            );
+                        }
+                        assert_eq!(deposit.amount, config.deposit_gwei);
+                        let deposit_message = DepositData {
+                            pubkey: deposit.pubkey,
+                            withdrawal_credentials: deposit.withdrawal_credentials,
+                            amount: deposit.amount,
+                            signature: SignatureBytes::empty(),
+                        }
+                        .as_deposit_message();
+                        assert!(deposit.signature.decompress().unwrap().verify(
+                            &validator_pubkey,
+                            deposit_message.signing_root(spec.get_deposit_domain())
+                        ));
+                        assert_eq!(deposit.fork_version, spec.genesis_fork_version);
+                        assert_eq!(&deposit.network_name, spec.config_name.as_ref().unwrap());
+                        assert_eq!(
+                            deposit.deposit_message_root,
+                            deposit_message.tree_hash_root()
+                        );
+                        assert_eq!(
+                            deposit.deposit_data_root,
+                            DepositData {
+                                pubkey: deposit.pubkey,
+                                withdrawal_credentials: deposit.withdrawal_credentials,
+                                amount: deposit.amount,
+                                signature: deposit.signature.clone()
+                            }
+                            .tree_hash_root()
+                        );
+                    }
+                }
+            }
+
+            // The directory containing the mnemonic can now be removed.
+            drop(mnemonic_dir);
+
+            TestResult { result, output_dir }
+        }
+    }
+
+    #[must_use] // Use the `assert_ok` or `assert_err` fns to "use" this value.
+    pub struct TestResult {
+        pub result: Result<(), String>,
+        pub output_dir: TempDir,
+    }
+
+    impl TestResult {
+        pub fn validators_file_path(&self) -> PathBuf {
+            self.output_dir.path().join(VALIDATORS_FILENAME)
+        }
+
+        pub fn validators(&self) -> Vec<ValidatorSpecification> {
+            let contents = fs::read_to_string(self.validators_file_path()).unwrap();
+            serde_json::from_str(&contents).unwrap()
+        }
+
+        fn assert_ok(self) {
+            assert_eq!(self.result, Ok(()))
+        }
+
+        fn assert_err(self) {
+            assert!(self.result.is_err())
+        }
+    }
+
+    #[tokio::test]
+    async fn default_test_values() {
+        TestBuilder::default().run_test().await.assert_ok();
+    }
+
+    #[tokio::test]
+    async fn no_eth1_address_without_force() {
+        TestBuilder::default()
+            .mutate_config(|config| {
+                config.eth1_withdrawal_address = None;
+                config.force_bls_withdrawal_credentials = false
+            })
+            .run_test()
+            .await
+            .assert_err();
+    }
+
+    #[tokio::test]
+    async fn bls_withdrawal_credentials() {
+        TestBuilder::default()
+            .mutate_config(|config| {
+                config.eth1_withdrawal_address = None;
+                config.force_bls_withdrawal_credentials = true
+            })
+            .run_test()
+            .await
+            .assert_ok();
+    }
+
+    #[tokio::test]
+    async fn default_test_values_deposits_disabled() {
+        TestBuilder::default()
+            .mutate_config(|config| config.disable_deposits = true)
+            .run_test()
+            .await
+            .assert_ok();
+    }
+
+    #[tokio::test]
+    async fn count_is_zero() {
+        TestBuilder::default()
+            .mutate_config(|config| config.count = 0)
+            .run_test()
+            .await
+            .assert_err();
+    }
+
+    #[tokio::test]
+    async fn eth1_withdrawal_addresses() {
+        TestBuilder::default()
+            .mutate_config(|config| {
+                config.count = 2;
+                config.eth1_withdrawal_address = junk_execution_address();
+            })
+            .run_test()
+            .await
+            .assert_ok();
+    }
+
+    #[tokio::test]
+    async fn non_zero_first_index() {
+        TestBuilder::default()
+            .mutate_config(|config| {
+                config.first_index = 2;
+                config.count = 2;
+            })
+            .run_test()
+            .await
+            .assert_ok();
+    }
+
+    #[tokio::test]
+    async fn misc_modifications() {
+        TestBuilder::default()
+            .mutate_config(|config| {
+                config.deposit_gwei = 42;
+                config.builder_proposals = Some(true);
+                config.gas_limit = Some(1337);
+            })
+            .run_test()
+            .await
+            .assert_ok();
+    }
+
+    #[tokio::test]
+    async fn bogus_bn_url() {
+        TestBuilder::default()
+            .mutate_config(|config| {
+                config.bn_url =
+                    Some(SensitiveUrl::from_str("http://sdjfvwfhsdhfschwkeyfwhwlga.com").unwrap());
+            })
+            .run_test()
+            .await
+            .assert_err();
+    }
+
+    #[tokio::test]
+    async fn staking_deposit_cli_vectors() {
+        let vectors_dir = PathBuf::from(env!("CARGO_MANIFEST_DIR"))
+            .join("test_vectors")
+            .join("vectors");
+        for entry in fs::read_dir(vectors_dir).unwrap() {
+            let entry = entry.unwrap();
+            let file_name = entry.file_name();
+            let vector_name = file_name.to_str().unwrap();
+            let path = entry.path();
+            // Leave this `println!` so we can tell which test fails.
+            println!("Running test {}", vector_name);
+            run_test_vector(vector_name, &path).await;
+        }
+    }
+
+    async fn run_test_vector<P: AsRef<Path>>(name: &str, vectors_path: P) {
+        /*
+         * Parse the test vector name into a set of test parameters.
+         */
+        let re = Regex::new(r"(.*)_(.*)_(.*)_(.*)_(.*)_(.*)_(.*)").unwrap();
+        let capture = re.captures_iter(name).next().unwrap();
+        let network = capture.get(1).unwrap().as_str();
+        let first = u32::from_str(capture.get(3).unwrap().as_str()).unwrap();
+        let count = u32::from_str(capture.get(5).unwrap().as_str()).unwrap();
+        let uses_eth1 = bool::from_str(capture.get(7).unwrap().as_str()).unwrap();
+
+        /*
+         * Use the test parameters to generate equivalent files "locally" (i.e., with our code).
+         */
+
+        let spec = Eth2NetworkConfig::constant(network)
+            .unwrap()
+            .unwrap()
+            .chain_spec::<E>()
+            .unwrap();
+
+        let test_result = TestBuilder::new(spec)
+            .mutate_config(|config| {
+                config.first_index = first;
+                config.count = count;
+                if uses_eth1 {
+                    config.eth1_withdrawal_address = Some(
+                        Address::from_str("0x0f51bb10119727a7e5ea3538074fb341f56b09ad").unwrap(),
+                    );
+                } else {
+                    config.eth1_withdrawal_address = None;
+                    config.force_bls_withdrawal_credentials = true;
+                }
+            })
+            .run_test()
+            .await;
+        let TestResult { result, output_dir } = test_result;
+        result.expect("local generation should succeed");
+
+        /*
+         * Ensure the deposit data is identical when parsed as JSON.
+         */
+
+        let local_deposits = {
+            let path = output_dir.path().join(DEPOSITS_FILENAME);
+            let contents = fs::read_to_string(&path).unwrap();
+            let mut deposits: Vec<StandardDepositDataJson> =
+                serde_json::from_str(&contents).unwrap();
+            for deposit in &mut deposits {
+                // Ensures we can match test vectors.
+                deposit.deposit_cli_version = TEST_VECTOR_DEPOSIT_CLI_VERSION.to_string();
+
+                // We use "prater" and the vectors use "goerli" now. The two names refer to the same
+                // network so there should be no issue here.
+                if deposit.network_name == "prater" {
+                    deposit.network_name = "goerli".to_string();
+                }
+            }
+            deposits
+        };
+        let vector_deposits: Vec<StandardDepositDataJson> = {
+            let path = fs::read_dir(vectors_path.as_ref().join("validator_keys"))
+                .unwrap()
+                .find_map(|entry| {
+                    let entry = entry.unwrap();
+                    let file_name = entry.file_name();
+                    if file_name.to_str().unwrap().starts_with("deposit_data") {
+                        Some(entry.path())
+                    } else {
+                        None
+                    }
+                })
+                .unwrap();
+            let contents = fs::read_to_string(path).unwrap();
+            serde_json::from_str(&contents).unwrap()
+        };
+
+        assert_eq!(local_deposits, vector_deposits);
+
+        /*
+         * Note: we don't check the keystores generated by the deposit-cli since there is little
+         * value in this.
+         *
+         * If we check the deposits then we are verifying the signature across the deposit message.
+         * This implicitly verifies that the keypair generated by the deposit-cli is identical to
+         * the one created by Lighthouse.
+         */
+    }
+}
diff --git a/validator_manager/src/import_validators.rs b/validator_manager/src/import_validators.rs
new file mode 100644
index 0000000000..4b924189f2
--- /dev/null
+++ b/validator_manager/src/import_validators.rs
@@ -0,0 +1,436 @@
+use super::common::*;
+use crate::DumpConfig;
+use clap::{App, Arg, ArgMatches};
+use eth2::{lighthouse_vc::std_types::ImportKeystoreStatus, SensitiveUrl};
+use serde::{Deserialize, Serialize};
+use std::fs;
+use std::path::PathBuf;
+
+pub const CMD: &str = "import";
+pub const VALIDATORS_FILE_FLAG: &str = "validators-file";
+pub const VC_URL_FLAG: &str = "vc-url";
+pub const VC_TOKEN_FLAG: &str = "vc-token";
+
+pub const DETECTED_DUPLICATE_MESSAGE: &str = "Duplicate validator detected!";
+
+pub fn cli_app<'a, 'b>() -> App<'a, 'b> {
+    App::new(CMD)
+        .about(
+            "Uploads validators to a validator client using the HTTP API. The validators \
+                are defined in a JSON file which can be generated using the \"create-validators\" \
+                command.",
+        )
+        .arg(
+            Arg::with_name(VALIDATORS_FILE_FLAG)
+                .long(VALIDATORS_FILE_FLAG)
+                .value_name("PATH_TO_JSON_FILE")
+                .help(
+                    "The path to a JSON file containing a list of validators to be \
+                    imported to the validator client. This file is usually named \
+                    \"validators.json\".",
+                )
+                .required(true)
+                .takes_value(true),
+        )
+        .arg(
+            Arg::with_name(VC_URL_FLAG)
+                .long(VC_URL_FLAG)
+                .value_name("HTTP_ADDRESS")
+                .help(
+                    "A HTTP(S) address of a validator client using the keymanager-API. \
+                    If this value is not supplied then a 'dry run' will be conducted where \
+                    no changes are made to the validator client.",
+                )
+                .default_value("http://localhost:5062")
+                .requires(VC_TOKEN_FLAG)
+                .takes_value(true),
+        )
+        .arg(
+            Arg::with_name(VC_TOKEN_FLAG)
+                .long(VC_TOKEN_FLAG)
+                .value_name("PATH")
+                .help("The file containing a token required by the validator client.")
+                .takes_value(true),
+        )
+        .arg(
+            Arg::with_name(IGNORE_DUPLICATES_FLAG)
+                .takes_value(false)
+                .long(IGNORE_DUPLICATES_FLAG)
+                .help(
+                    "If present, ignore any validators which already exist on the VC. \
+                    Without this flag, the process will terminate without making any changes. \
+                    This flag should be used with caution, whilst it does not directly cause \
+                    slashable conditions, it might be an indicator that something is amiss. \
+                    Users should also be careful to avoid submitting duplicate deposits for \
+                    validators that already exist on the VC.",
+                ),
+        )
+}
+
+#[derive(Clone, PartialEq, Debug, Serialize, Deserialize)]
+pub struct ImportConfig {
+    pub validators_file_path: PathBuf,
+    pub vc_url: SensitiveUrl,
+    pub vc_token_path: PathBuf,
+    pub ignore_duplicates: bool,
+}
+
+impl ImportConfig {
+    fn from_cli(matches: &ArgMatches) -> Result<Self, String> {
+        Ok(Self {
+            validators_file_path: clap_utils::parse_required(matches, VALIDATORS_FILE_FLAG)?,
+            vc_url: clap_utils::parse_required(matches, VC_URL_FLAG)?,
+            vc_token_path: clap_utils::parse_required(matches, VC_TOKEN_FLAG)?,
+            ignore_duplicates: matches.is_present(IGNORE_DUPLICATES_FLAG),
+        })
+    }
+}
+
+pub async fn cli_run<'a>(
+    matches: &'a ArgMatches<'a>,
+    dump_config: DumpConfig,
+) -> Result<(), String> {
+    let config = ImportConfig::from_cli(matches)?;
+    if dump_config.should_exit_early(&config)? {
+        Ok(())
+    } else {
+        run(config).await
+    }
+}
+
+async fn run<'a>(config: ImportConfig) -> Result<(), String> {
+    let ImportConfig {
+        validators_file_path,
+        vc_url,
+        vc_token_path,
+        ignore_duplicates,
+    } = config;
+
+    if !validators_file_path.exists() {
+        return Err(format!("Unable to find file at {:?}", validators_file_path));
+    }
+
+    let validators_file = fs::OpenOptions::new()
+        .read(true)
+        .create(false)
+        .open(&validators_file_path)
+        .map_err(|e| format!("Unable to open {:?}: {:?}", validators_file_path, e))?;
+    let validators: Vec<ValidatorSpecification> = serde_json::from_reader(&validators_file)
+        .map_err(|e| {
+            format!(
+                "Unable to parse JSON in {:?}: {:?}",
+                validators_file_path, e
+            )
+        })?;
+
+    let count = validators.len();
+
+    let (http_client, _keystores) = vc_http_client(vc_url.clone(), &vc_token_path).await?;
+
+    eprintln!(
+        "Starting to submit {} validators to VC, each validator may take several seconds",
+        count
+    );
+
+    for (i, validator) in validators.into_iter().enumerate() {
+        match validator.upload(&http_client, ignore_duplicates).await {
+            Ok(status) => {
+                match status.status {
+                    ImportKeystoreStatus::Imported => {
+                        eprintln!("Uploaded keystore {} of {} to the VC", i + 1, count)
+                    }
+                    ImportKeystoreStatus::Duplicate => {
+                        if ignore_duplicates {
+                            eprintln!("Re-uploaded keystore {} of {} to the VC", i + 1, count)
+                        } else {
+                            eprintln!(
+                                "Keystore {} of {} was uploaded to the VC, but it was a duplicate. \
+                                Exiting now, use --{} to allow duplicates.",
+                                i + 1, count, IGNORE_DUPLICATES_FLAG
+                            );
+                            return Err(DETECTED_DUPLICATE_MESSAGE.to_string());
+                        }
+                    }
+                    ImportKeystoreStatus::Error => {
+                        eprintln!(
+                            "Upload of keystore {} of {} failed with message: {:?}. \
+                                A potential solution is run this command again \
+                                using the --{} flag, however care should be taken to ensure \
+                                that there are no duplicate deposits submitted.",
+                            i + 1,
+                            count,
+                            status.message,
+                            IGNORE_DUPLICATES_FLAG
+                        );
+                        return Err(format!("Upload failed with {:?}", status.message));
+                    }
+                }
+            }
+            e @ Err(UploadError::InvalidPublicKey) => {
+                eprintln!("Validator {} has an invalid public key", i);
+                return Err(format!("{:?}", e));
+            }
+            ref e @ Err(UploadError::DuplicateValidator(voting_public_key)) => {
+                eprintln!(
+                    "Duplicate validator {:?} already exists on the destination validator client. \
+                    This may indicate that some validators are running in two places at once, which \
+                    can lead to slashing. If you are certain that there is no risk, add the --{} flag.",
+                    voting_public_key, IGNORE_DUPLICATES_FLAG
+                );
+                return Err(format!("{:?}", e));
+            }
+            Err(UploadError::FailedToListKeys(e)) => {
+                eprintln!(
+                    "Failed to list keystores. Some keys may have been imported whilst \
+                    others may not have been imported. A potential solution is run this command again \
+                    using the --{} flag, however care should be taken to ensure that there are no \
+                    duplicate deposits submitted.",
+                    IGNORE_DUPLICATES_FLAG
+                );
+                return Err(format!("{:?}", e));
+            }
+            Err(UploadError::KeyUploadFailed(e)) => {
+                eprintln!(
+                    "Failed to upload keystore. Some keys may have been imported whilst \
+                    others may not have been imported. A potential solution is run this command again \
+                    using the --{} flag, however care should be taken to ensure that there are no \
+                    duplicate deposits submitted.",
+                    IGNORE_DUPLICATES_FLAG
+                );
+                return Err(format!("{:?}", e));
+            }
+            Err(UploadError::IncorrectStatusCount(count)) => {
+                eprintln!(
+                    "Keystore was uploaded, however the validator client returned an invalid response. \
+                    A potential solution is run this command again using the --{} flag, however care \
+                    should be taken to ensure that there are no duplicate deposits submitted.",
+                    IGNORE_DUPLICATES_FLAG
+                );
+                return Err(format!(
+                    "Invalid status count in import response: {}",
+                    count
+                ));
+            }
+            Err(UploadError::FeeRecipientUpdateFailed(e)) => {
+                eprintln!(
+                    "Failed to set fee recipient for validator {}. This value may need \
+                    to be set manually. Continuing with other validators. Error was {:?}",
+                    i, e
+                );
+            }
+            Err(UploadError::PatchValidatorFailed(e)) => {
+                eprintln!(
+                    "Failed to set some values on validator {} (e.g., builder, enabled or gas limit. \
+                    These values value may need to be set manually. Continuing with other validators. \
+                    Error was {:?}",
+                    i, e
+                );
+            }
+        }
+    }
+
+    Ok(())
+}
+
+// The tests use crypto and are too slow in debug.
+#[cfg(not(debug_assertions))]
+#[cfg(test)]
+pub mod tests {
+    use super::*;
+    use crate::create_validators::tests::TestBuilder as CreateTestBuilder;
+    use std::fs;
+    use tempfile::{tempdir, TempDir};
+    use validator_client::http_api::{test_utils::ApiTester, Config as HttpConfig};
+
+    const VC_TOKEN_FILE_NAME: &str = "vc_token.json";
+
+    pub struct TestBuilder {
+        import_config: ImportConfig,
+        pub vc: ApiTester,
+        /// Holds the temp directory owned by the `CreateTestBuilder` so it doesn't get cleaned-up
+        /// before we can read it.
+        create_dir: Option<TempDir>,
+        _dir: TempDir,
+    }
+
+    impl TestBuilder {
+        pub async fn new() -> Self {
+            Self::new_with_http_config(ApiTester::default_http_config()).await
+        }
+
+        pub async fn new_with_http_config(http_config: HttpConfig) -> Self {
+            let dir = tempdir().unwrap();
+            let vc = ApiTester::new_with_http_config(http_config).await;
+            let vc_token_path = dir.path().join(VC_TOKEN_FILE_NAME);
+            fs::write(&vc_token_path, &vc.api_token).unwrap();
+
+            Self {
+                import_config: ImportConfig {
+                    // This field will be overwritten later on.
+                    validators_file_path: dir.path().into(),
+                    vc_url: vc.url.clone(),
+                    vc_token_path,
+                    ignore_duplicates: false,
+                },
+                vc,
+                create_dir: None,
+                _dir: dir,
+            }
+        }
+
+        pub fn mutate_import_config<F: Fn(&mut ImportConfig)>(mut self, func: F) -> Self {
+            func(&mut self.import_config);
+            self
+        }
+
+        pub async fn create_validators(mut self, count: u32, first_index: u32) -> Self {
+            let create_result = CreateTestBuilder::default()
+                .mutate_config(|config| {
+                    config.count = count;
+                    config.first_index = first_index;
+                })
+                .run_test()
+                .await;
+            assert!(
+                create_result.result.is_ok(),
+                "precondition: validators are created"
+            );
+            self.import_config.validators_file_path = create_result.validators_file_path();
+            self.create_dir = Some(create_result.output_dir);
+            self
+        }
+
+        /// Imports validators without running the entire test suite in `Self::run_test`. This is
+        /// useful for simulating duplicate imports.
+        pub async fn import_validators_without_checks(self) -> Self {
+            run(self.import_config.clone()).await.unwrap();
+            self
+        }
+
+        pub async fn run_test(self) -> TestResult {
+            let result = run(self.import_config.clone()).await;
+
+            if result.is_ok() {
+                self.vc.ensure_key_cache_consistency().await;
+
+                let local_validators: Vec<ValidatorSpecification> = {
+                    let contents =
+                        fs::read_to_string(&self.import_config.validators_file_path).unwrap();
+                    serde_json::from_str(&contents).unwrap()
+                };
+                let list_keystores_response = self.vc.client.get_keystores().await.unwrap().data;
+
+                assert_eq!(
+                    local_validators.len(),
+                    list_keystores_response.len(),
+                    "vc should have exactly the number of validators imported"
+                );
+
+                for local_validator in &local_validators {
+                    let local_keystore = &local_validator.voting_keystore.0;
+                    let local_pubkey = local_keystore.public_key().unwrap().into();
+                    let remote_validator = list_keystores_response
+                        .iter()
+                        .find(|validator| validator.validating_pubkey == local_pubkey)
+                        .expect("validator must exist on VC");
+                    assert_eq!(&remote_validator.derivation_path, &local_keystore.path());
+                    assert_eq!(remote_validator.readonly, Some(false));
+                }
+            }
+
+            TestResult {
+                result,
+                vc: self.vc,
+            }
+        }
+    }
+
+    #[must_use] // Use the `assert_ok` or `assert_err` fns to "use" this value.
+    pub struct TestResult {
+        pub result: Result<(), String>,
+        pub vc: ApiTester,
+    }
+
+    impl TestResult {
+        fn assert_ok(self) {
+            assert_eq!(self.result, Ok(()))
+        }
+
+        fn assert_err_contains(self, msg: &str) {
+            assert!(self.result.unwrap_err().contains(msg))
+        }
+    }
+
+    #[tokio::test]
+    async fn create_one_validator() {
+        TestBuilder::new()
+            .await
+            .create_validators(1, 0)
+            .await
+            .run_test()
+            .await
+            .assert_ok();
+    }
+
+    #[tokio::test]
+    async fn create_three_validators() {
+        TestBuilder::new()
+            .await
+            .create_validators(3, 0)
+            .await
+            .run_test()
+            .await
+            .assert_ok();
+    }
+
+    #[tokio::test]
+    async fn create_one_validator_with_offset() {
+        TestBuilder::new()
+            .await
+            .create_validators(1, 42)
+            .await
+            .run_test()
+            .await
+            .assert_ok();
+    }
+
+    #[tokio::test]
+    async fn create_three_validators_with_offset() {
+        TestBuilder::new()
+            .await
+            .create_validators(3, 1337)
+            .await
+            .run_test()
+            .await
+            .assert_ok();
+    }
+
+    #[tokio::test]
+    async fn import_duplicates_when_disallowed() {
+        TestBuilder::new()
+            .await
+            .create_validators(1, 0)
+            .await
+            .import_validators_without_checks()
+            .await
+            .run_test()
+            .await
+            .assert_err_contains("DuplicateValidator");
+    }
+
+    #[tokio::test]
+    async fn import_duplicates_when_allowed() {
+        TestBuilder::new()
+            .await
+            .mutate_import_config(|config| {
+                config.ignore_duplicates = true;
+            })
+            .create_validators(1, 0)
+            .await
+            .import_validators_without_checks()
+            .await
+            .run_test()
+            .await
+            .assert_ok();
+    }
+}
diff --git a/validator_manager/src/lib.rs b/validator_manager/src/lib.rs
new file mode 100644
index 0000000000..6889ee79d2
--- /dev/null
+++ b/validator_manager/src/lib.rs
@@ -0,0 +1,85 @@
+use clap::App;
+use clap::ArgMatches;
+use common::write_to_json_file;
+use environment::Environment;
+use serde::Serialize;
+use std::path::PathBuf;
+use types::EthSpec;
+
+pub mod common;
+pub mod create_validators;
+pub mod import_validators;
+pub mod move_validators;
+
+pub const CMD: &str = "validator_manager";
+
+/// This flag is on the top-level `lighthouse` binary.
+const DUMP_CONFIGS_FLAG: &str = "dump-config";
+
+/// Used only in testing, this allows a command to dump its configuration to a file and then exit
+/// successfully. This allows for testing how the CLI arguments translate to some configuration.
+pub enum DumpConfig {
+    Disabled,
+    Enabled(PathBuf),
+}
+
+impl DumpConfig {
+    /// Returns `Ok(true)` if the configuration was successfully written to a file and the
+    /// application should exit successfully without doing anything else.
+    pub fn should_exit_early<T: Serialize>(&self, config: &T) -> Result<bool, String> {
+        match self {
+            DumpConfig::Disabled => Ok(false),
+            DumpConfig::Enabled(dump_path) => {
+                dbg!(dump_path);
+                write_to_json_file(dump_path, config)?;
+                Ok(true)
+            }
+        }
+    }
+}
+
+pub fn cli_app<'a, 'b>() -> App<'a, 'b> {
+    App::new(CMD)
+        .visible_aliases(&["vm", "validator-manager", CMD])
+        .about("Utilities for managing a Lighthouse validator client via the HTTP API.")
+        .subcommand(create_validators::cli_app())
+        .subcommand(import_validators::cli_app())
+        .subcommand(move_validators::cli_app())
+}
+
+/// Run the account manager, returning an error if the operation did not succeed.
+pub fn run<'a, T: EthSpec>(matches: &'a ArgMatches<'a>, env: Environment<T>) -> Result<(), String> {
+    let context = env.core_context();
+    let spec = context.eth2_config.spec;
+    let dump_config = clap_utils::parse_optional(matches, DUMP_CONFIGS_FLAG)?
+        .map(DumpConfig::Enabled)
+        .unwrap_or_else(|| DumpConfig::Disabled);
+
+    context
+        .executor
+        // This `block_on_dangerous` call reasonable since it is at the very highest level of the
+        // application, the rest of which is all async. All other functions below this should be
+        // async and should never call `block_on_dangerous` themselves.
+        .block_on_dangerous(
+            async {
+                match matches.subcommand() {
+                    (create_validators::CMD, Some(matches)) => {
+                        create_validators::cli_run::<T>(matches, &spec, dump_config).await
+                    }
+                    (import_validators::CMD, Some(matches)) => {
+                        import_validators::cli_run(matches, dump_config).await
+                    }
+                    (move_validators::CMD, Some(matches)) => {
+                        move_validators::cli_run(matches, dump_config).await
+                    }
+                    ("", _) => Err("No command supplied. See --help.".to_string()),
+                    (unknown, _) => Err(format!(
+                        "{} is not a valid {} command. See --help.",
+                        unknown, CMD
+                    )),
+                }
+            },
+            "validator_manager",
+        )
+        .ok_or("Shutting down")?
+}
diff --git a/validator_manager/src/move_validators.rs b/validator_manager/src/move_validators.rs
new file mode 100644
index 0000000000..fa886e8f94
--- /dev/null
+++ b/validator_manager/src/move_validators.rs
@@ -0,0 +1,1253 @@
+use super::common::*;
+use crate::DumpConfig;
+use account_utils::{read_password_from_user, ZeroizeString};
+use clap::{App, Arg, ArgMatches};
+use eth2::{
+    lighthouse_vc::{
+        std_types::{
+            DeleteKeystoreStatus, DeleteKeystoresRequest, ImportKeystoreStatus, InterchangeJsonStr,
+            Status,
+        },
+        types::{ExportKeystoresResponse, SingleExportKeystoresResponse},
+    },
+    SensitiveUrl,
+};
+use serde::{Deserialize, Serialize};
+use std::collections::{HashMap, HashSet};
+use std::path::PathBuf;
+use std::str::FromStr;
+use std::time::Duration;
+use tokio::time::sleep;
+use types::{Address, PublicKeyBytes};
+
+pub const MOVE_DIR_NAME: &str = "lighthouse-validator-move";
+pub const VALIDATOR_SPECIFICATION_FILE: &str = "validator-specification.json";
+
+pub const CMD: &str = "move";
+pub const SRC_VC_URL_FLAG: &str = "src-vc-url";
+pub const SRC_VC_TOKEN_FLAG: &str = "src-vc-token";
+pub const DEST_VC_URL_FLAG: &str = "dest-vc-url";
+pub const DEST_VC_TOKEN_FLAG: &str = "dest-vc-token";
+pub const VALIDATORS_FLAG: &str = "validators";
+pub const GAS_LIMIT_FLAG: &str = "gas-limit";
+pub const FEE_RECIPIENT_FLAG: &str = "suggested-fee-recipient";
+pub const BUILDER_PROPOSALS_FLAG: &str = "builder-proposals";
+
+const NO_VALIDATORS_MSG: &str = "No validators present on source validator client";
+
+const UPLOAD_RETRY_WAIT: Duration = Duration::from_secs(5);
+
+#[derive(Clone, PartialEq, Debug, Serialize, Deserialize)]
+pub enum PasswordSource {
+    /// Reads the password from the user via the terminal.
+    Interactive { stdin_inputs: bool },
+    /// This variant is panic-y and should only be used during testing.
+    Testing(HashMap<PublicKeyBytes, Vec<String>>),
+}
+
+impl PasswordSource {
+    fn read_password(&mut self, pubkey: &PublicKeyBytes) -> Result<ZeroizeString, String> {
+        match self {
+            PasswordSource::Interactive { stdin_inputs } => {
+                eprintln!("Please enter a password for keystore {:?}:", pubkey);
+                read_password_from_user(*stdin_inputs)
+            }
+            // This path with panic if the password list is empty. Since the
+            // password prompt will just keep retrying on a failed password, the
+            // panic helps us break the loop if we misconfigure the test.
+            PasswordSource::Testing(passwords) => Ok(passwords
+                .get_mut(pubkey)
+                .expect("pubkey should be known")
+                .remove(0)
+                .into()),
+        }
+    }
+}
+
+pub fn cli_app<'a, 'b>() -> App<'a, 'b> {
+    App::new(CMD)
+        .about(
+            "Uploads validators to a validator client using the HTTP API. The validators \
+                are defined in a JSON file which can be generated using the \"create-validators\" \
+                command. This command only supports validators signing via a keystore on the local \
+                file system (i.e., not Web3Signer validators).",
+        )
+        .arg(
+            Arg::with_name(SRC_VC_URL_FLAG)
+                .long(SRC_VC_URL_FLAG)
+                .value_name("HTTP_ADDRESS")
+                .help(
+                    "A HTTP(S) address of a validator client using the keymanager-API. \
+                    This validator client is the \"source\" and contains the validators \
+                    that are to be moved.",
+                )
+                .required(true)
+                .requires(SRC_VC_TOKEN_FLAG)
+                .takes_value(true),
+        )
+        .arg(
+            Arg::with_name(SRC_VC_TOKEN_FLAG)
+                .long(SRC_VC_TOKEN_FLAG)
+                .value_name("PATH")
+                .help("The file containing a token required by the source validator client.")
+                .takes_value(true),
+        )
+        .arg(
+            Arg::with_name(DEST_VC_URL_FLAG)
+                .long(DEST_VC_URL_FLAG)
+                .value_name("HTTP_ADDRESS")
+                .help(
+                    "A HTTP(S) address of a validator client using the keymanager-API. \
+                    This validator client is the \"destination\" and will have new validators \
+                    added as they are removed from the \"source\" validator client.",
+                )
+                .required(true)
+                .requires(DEST_VC_TOKEN_FLAG)
+                .takes_value(true),
+        )
+        .arg(
+            Arg::with_name(DEST_VC_TOKEN_FLAG)
+                .long(DEST_VC_TOKEN_FLAG)
+                .value_name("PATH")
+                .help("The file containing a token required by the destination validator client.")
+                .takes_value(true),
+        )
+        .arg(
+            Arg::with_name(VALIDATORS_FLAG)
+                .long(VALIDATORS_FLAG)
+                .value_name("STRING")
+                .help(
+                    "The validators to be moved. Either a list of 0x-prefixed \
+                    validator pubkeys or the keyword \"all\".",
+                )
+                .takes_value(true),
+        )
+        .arg(
+            Arg::with_name(COUNT_FLAG)
+                .long(COUNT_FLAG)
+                .value_name("VALIDATOR_COUNT")
+                .help("The number of validators to move.")
+                .conflicts_with(VALIDATORS_FLAG)
+                .takes_value(true),
+        )
+        .arg(
+            Arg::with_name(GAS_LIMIT_FLAG)
+                .long(GAS_LIMIT_FLAG)
+                .value_name("UINT64")
+                .help(
+                    "All created validators will use this gas limit. It is recommended \
+                    to leave this as the default value by not specifying this flag.",
+                )
+                .required(false)
+                .takes_value(true),
+        )
+        .arg(
+            Arg::with_name(FEE_RECIPIENT_FLAG)
+                .long(FEE_RECIPIENT_FLAG)
+                .value_name("ETH1_ADDRESS")
+                .help(
+                    "All created validators will use this value for the suggested \
+                    fee recipient. Omit this flag to use the default value from the VC.",
+                )
+                .required(false)
+                .takes_value(true),
+        )
+        .arg(
+            Arg::with_name(BUILDER_PROPOSALS_FLAG)
+                .long(BUILDER_PROPOSALS_FLAG)
+                .help(
+                    "When provided, all created validators will attempt to create \
+                    blocks via builder rather than the local EL.",
+                )
+                .required(false)
+                .possible_values(&["true", "false"])
+                .takes_value(true),
+        )
+        .arg(
+            Arg::with_name(STDIN_INPUTS_FLAG)
+                .takes_value(false)
+                .hidden(cfg!(windows))
+                .long(STDIN_INPUTS_FLAG)
+                .help("If present, read all user inputs from stdin instead of tty."),
+        )
+}
+
+#[derive(Clone, PartialEq, Debug, Serialize, Deserialize)]
+pub enum Validators {
+    All,
+    Count(usize),
+    Specific(Vec<PublicKeyBytes>),
+}
+
+#[derive(Clone, PartialEq, Debug, Serialize, Deserialize)]
+pub struct MoveConfig {
+    pub src_vc_url: SensitiveUrl,
+    pub src_vc_token_path: PathBuf,
+    pub dest_vc_url: SensitiveUrl,
+    pub dest_vc_token_path: PathBuf,
+    pub validators: Validators,
+    pub builder_proposals: Option<bool>,
+    pub fee_recipient: Option<Address>,
+    pub gas_limit: Option<u64>,
+    pub password_source: PasswordSource,
+}
+
+impl MoveConfig {
+    fn from_cli(matches: &ArgMatches) -> Result<Self, String> {
+        let count_flag = clap_utils::parse_optional(matches, COUNT_FLAG)?;
+        let validators_flag = matches.value_of(VALIDATORS_FLAG);
+        let validators = match (count_flag, validators_flag) {
+            (Some(count), None) => Validators::Count(count),
+            (None, Some(string)) => match string {
+                "all" => Validators::All,
+                pubkeys => pubkeys
+                    .split(',')
+                    .map(PublicKeyBytes::from_str)
+                    .collect::<Result<Vec<_>, _>>()
+                    .map(Validators::Specific)?,
+            },
+            (None, None) => Err(format!(
+                "Must supply either --{VALIDATORS_FLAG} or --{COUNT_FLAG}."
+            ))?,
+            (Some(_), Some(_)) => {
+                Err("Cannot supply both --{VALIDATORS_FLAG} and --{COUNT_FLAG}.")?
+            }
+        };
+
+        Ok(Self {
+            src_vc_url: clap_utils::parse_required(matches, SRC_VC_URL_FLAG)?,
+            src_vc_token_path: clap_utils::parse_required(matches, SRC_VC_TOKEN_FLAG)?,
+            dest_vc_url: clap_utils::parse_required(matches, DEST_VC_URL_FLAG)?,
+            dest_vc_token_path: clap_utils::parse_required(matches, DEST_VC_TOKEN_FLAG)?,
+            validators,
+            builder_proposals: clap_utils::parse_optional(matches, BUILDER_PROPOSALS_FLAG)?,
+            fee_recipient: clap_utils::parse_optional(matches, FEE_RECIPIENT_FLAG)?,
+            gas_limit: clap_utils::parse_optional(matches, GAS_LIMIT_FLAG)?,
+            password_source: PasswordSource::Interactive {
+                stdin_inputs: cfg!(windows) || matches.is_present(STDIN_INPUTS_FLAG),
+            },
+        })
+    }
+}
+
+pub async fn cli_run<'a>(
+    matches: &'a ArgMatches<'a>,
+    dump_config: DumpConfig,
+) -> Result<(), String> {
+    let config = MoveConfig::from_cli(matches)?;
+    if dump_config.should_exit_early(&config)? {
+        Ok(())
+    } else {
+        run(config).await
+    }
+}
+
+async fn run<'a>(config: MoveConfig) -> Result<(), String> {
+    let MoveConfig {
+        src_vc_url,
+        src_vc_token_path,
+        dest_vc_url,
+        dest_vc_token_path,
+        validators,
+        builder_proposals,
+        fee_recipient,
+        gas_limit,
+        mut password_source,
+    } = config;
+
+    // Moving validators between the same VC is unlikely to be useful and probably indicates a user
+    // error.
+    if src_vc_url == dest_vc_url {
+        return Err(format!(
+            "--{} and --{} must be different",
+            SRC_VC_URL_FLAG, DEST_VC_URL_FLAG
+        ));
+    }
+
+    let (src_http_client, src_keystores) =
+        vc_http_client(src_vc_url.clone(), &src_vc_token_path).await?;
+    let (dest_http_client, _dest_keystores) =
+        vc_http_client(dest_vc_url.clone(), &dest_vc_token_path).await?;
+
+    if src_keystores.is_empty() {
+        return Err(NO_VALIDATORS_MSG.to_string());
+    }
+
+    let pubkeys_to_move = match validators {
+        Validators::All => src_keystores.iter().map(|v| v.validating_pubkey).collect(),
+        Validators::Count(count) => {
+            let mut viable_pubkeys: Vec<_> = src_keystores
+                .iter()
+                .filter(|v| !v.readonly.unwrap_or(true))
+                .map(|v| v.validating_pubkey)
+                .collect();
+            viable_pubkeys.sort_unstable_by_key(PublicKeyBytes::serialize);
+            viable_pubkeys
+                .get(0..count)
+                .ok_or_else(|| {
+                    format!(
+                        "Cannot move {} keystores since source validator client only has {} \
+                        keystores which are able to be moved (not read-only).",
+                        count,
+                        viable_pubkeys.len()
+                    )
+                })?
+                .to_vec()
+        }
+        Validators::Specific(request_pubkeys) => {
+            let request_pubkeys_set: HashSet<_> = request_pubkeys.iter().collect();
+            let src_pubkeys_set: HashSet<_> =
+                src_keystores.iter().map(|v| &v.validating_pubkey).collect();
+            let difference = request_pubkeys_set
+                .difference(&src_pubkeys_set)
+                .collect::<Vec<_>>();
+            if !difference.is_empty() {
+                for pk in &difference {
+                    eprintln!("{:?} is not present on {:?}", pk, src_vc_url);
+                }
+                return Err(format!(
+                    "{} validators not found on {:?}",
+                    difference.len(),
+                    src_vc_url
+                ));
+            }
+            request_pubkeys
+        }
+    };
+
+    let src_keystores_map: HashMap<_, _> = src_keystores
+        .iter()
+        .map(|k| (k.validating_pubkey, k))
+        .collect();
+
+    let count = pubkeys_to_move.len();
+    for (i, &pubkey_to_move) in pubkeys_to_move.iter().enumerate() {
+        // Skip read-only validators rather than exiting. This makes it a bit easier to use the
+        // "all" flag.
+        if src_keystores_map
+            .get(&pubkey_to_move)
+            .ok_or("Inconsistent src keystore map")?
+            .readonly
+            .unwrap_or(true)
+        {
+            eprintln!("Skipping read-only validator {:?}", pubkey_to_move);
+        }
+
+        let request = DeleteKeystoresRequest {
+            pubkeys: vec![pubkey_to_move],
+        };
+        let deleted = match src_http_client.delete_lighthouse_keystores(&request).await {
+            Ok(deleted) => deleted,
+            Err(e) => {
+                match src_http_client.get_keystores().await {
+                    Ok(response) => {
+                        if response
+                            .data
+                            .iter()
+                            .any(|v| v.validating_pubkey == pubkey_to_move)
+                        {
+                            eprintln!(
+                                "There was an error removing a validator, however the validator \
+                            is still present on the source validator client. The recommended \
+                            solution is to run this command again."
+                            );
+                        }
+                    }
+                    Err(_) => {
+                        eprintln!(
+                            "There was an error removing a validator and it's unclear if \
+                            the validator was removed or not. Manual user intervention is \
+                            required."
+                        );
+                    }
+                };
+
+                return Err(format!("Deleting {:?} failed with {:?}", pubkey_to_move, e));
+            }
+        };
+
+        let ExportKeystoresResponse {
+            mut data,
+            slashing_protection,
+        } = deleted;
+
+        if data.len() != 1 {
+            return Err(format!(
+                "Too many deleted validators from VC: {}",
+                data.len()
+            ));
+        }
+
+        let exported_validator = data
+            .pop()
+            .ok_or("VC responded with zero deleted validators")?;
+
+        let (voting_keystore, voting_keystore_password) = match exported_validator {
+            SingleExportKeystoresResponse {
+                status:
+                    Status {
+                        status: DeleteKeystoreStatus::Deleted,
+                        message: _,
+                    },
+                validating_keystore,
+                validating_keystore_password,
+            } => match (validating_keystore, validating_keystore_password) {
+                (Some(keystore), Some(password)) => (keystore, password),
+                (Some(keystore), None) => {
+                    eprintln!(
+                        "Validator {:?} requires a password, please provide it to continue \
+                            moving validators. \
+                            The dest VC will store this password on its filesystem and the password \
+                            will not be required next time the dest VC starts. \
+                            If the provided password is incorrect the user will \
+                            be asked to provide another password. \
+                            Failing to provide the correct password now will \
+                            result in the keystore being deleted from the src VC \
+                            without being transfered to the dest VC. \
+                            It is strongly recommend to provide a password now rather than exiting.",
+                        pubkey_to_move
+                    );
+
+                    // Read the password from the user, retrying if the password is incorrect.
+                    loop {
+                        match password_source.read_password(&pubkey_to_move) {
+                            Ok(password) => {
+                                if let Err(e) = keystore.decrypt_keypair(password.as_ref()) {
+                                    eprintln!("Failed to decrypt keystore: {:?}", e);
+                                } else {
+                                    break (keystore, password);
+                                }
+                            }
+                            Err(e) => {
+                                eprintln!(
+                                    "Retrying after error: {:?}. If this error persists the user will need to \
+                                        manually recover their keystore for validator {:?} from the mnemonic."
+                                    ,
+                                    e, pubkey_to_move
+                                );
+                            }
+                        }
+
+                        // Add a sleep here to prevent spamming the console.
+                        sleep(Duration::from_secs(1)).await;
+                    }
+                }
+                (None, password_opt) => {
+                    eprintln!(
+                        "Validator {:?} was not moved since the validator client did \
+                            not return a keystore. It is likely that the \
+                            validator has been deleted from the source validator client \
+                            without being moved to the destination validator client. \
+                            This validator will most likely need to be manually recovered \
+                            from a mnemonic or backup.",
+                        pubkey_to_move
+                    );
+                    return Err(format!(
+                        "VC returned deleted but keystore not present (password {})",
+                        password_opt.is_some()
+                    ));
+                }
+            },
+            SingleExportKeystoresResponse {
+                status: Status { status, .. },
+                ..
+            } if matches!(
+                status,
+                DeleteKeystoreStatus::NotFound | DeleteKeystoreStatus::NotActive
+            ) =>
+            {
+                eprintln!(
+                    "Validator {:?} was not moved since it was not found or not active. This scenario \
+                    is unexpected and might indicate that another process is also performing \
+                    an export from the source validator client. Exiting now for safety. \
+                    If there is definitely no other process exporting validators then it \
+                    may be safe to run this command again.",
+                    pubkey_to_move
+                );
+                return Err(format!(
+                    "VC indicated that a previously known validator was {:?}",
+                    status,
+                ));
+            }
+            SingleExportKeystoresResponse {
+                status: Status { status, message },
+                ..
+            } => {
+                eprintln!(
+                    "Validator {:?} was not moved because the source validator client \
+                    indicated there was an error disabling it. Manual intervention is \
+                    required to recover from this scenario.",
+                    pubkey_to_move
+                );
+                return Err(format!(
+                    "VC returned status {:?} with message {:?}",
+                    status, message
+                ));
+            }
+        };
+
+        let keystore_derivation_path = voting_keystore.0.path();
+
+        let validator_specification = ValidatorSpecification {
+            voting_keystore,
+            voting_keystore_password,
+            slashing_protection: Some(InterchangeJsonStr(slashing_protection)),
+            fee_recipient,
+            gas_limit,
+            builder_proposals,
+            // Allow the VC to choose a default "enabled" state. Since "enabled" is not part of
+            // the standard API, leaving this as `None` means we are not forced to use the
+            // non-standard API.
+            enabled: None,
+        };
+
+        // We might as well just ignore validators that already exist on the destination machine,
+        // there doesn't appear to be much harm just adding them again and removing them from the
+        // source VC is an improvement.
+        let ignore_duplicates = true;
+
+        loop {
+            match validator_specification
+                .clone()
+                .upload(&dest_http_client, ignore_duplicates)
+                .await
+            {
+                Ok(status) => {
+                    match status.status {
+                        ImportKeystoreStatus::Imported => {
+                            eprintln!("Moved keystore {} of {}", i + 1, count);
+                            break;
+                        }
+                        ImportKeystoreStatus::Duplicate => {
+                            eprintln!("Moved duplicate keystore {} of {} to the VC", i + 1, count);
+                            break;
+                        }
+                        ImportKeystoreStatus::Error => {
+                            eprintln!(
+                                "Upload of keystore {} of {} failed with message: {:?}.",
+                                i + 1,
+                                count,
+                                status.message,
+                            );
+                            // Retry uploading this validator.
+                            sleep_with_retry_message(
+                                &pubkey_to_move,
+                                keystore_derivation_path.as_deref(),
+                            )
+                            .await;
+                        }
+                    }
+                }
+                e @ Err(UploadError::InvalidPublicKey) => {
+                    eprintln!("Validator {} has an invalid public key", i);
+                    return Err(format!("{:?}", e));
+                }
+                Err(UploadError::DuplicateValidator(_)) => {
+                    return Err(
+                        "Duplicate validator detected when duplicates are ignored".to_string()
+                    );
+                }
+                Err(UploadError::FailedToListKeys(e)) => {
+                    eprintln!(
+                        "Failed to list keystores. Some keys may have been moved whilst \
+                        others may not. Error was {:?}",
+                        e
+                    );
+                    // Retry uploading this validator.
+                    sleep_with_retry_message(&pubkey_to_move, keystore_derivation_path.as_deref())
+                        .await;
+                }
+                Err(UploadError::KeyUploadFailed(e)) => {
+                    eprintln!(
+                        "Failed to upload keystore. Some keys may have been moved whilst \
+                        others may not. Error was {:?}",
+                        e
+                    );
+                    // Retry uploading this validator.
+                    sleep_with_retry_message(&pubkey_to_move, keystore_derivation_path.as_deref())
+                        .await;
+                }
+                Err(UploadError::IncorrectStatusCount(count)) => {
+                    eprintln!(
+                        "Keystore was uploaded, however the validator client returned an invalid response."
+                    );
+                    return Err(format!(
+                        "Invalid status count in import response: {}",
+                        count
+                    ));
+                }
+                Err(UploadError::FeeRecipientUpdateFailed(e)) => {
+                    eprintln!(
+                        "Failed to set fee recipient for validator {}. This value may need \
+                        to be set manually. Continuing with other validators. Error was {:?}",
+                        i, e
+                    );
+                    // Continue onto the next validator.
+                    break;
+                }
+                Err(UploadError::PatchValidatorFailed(e)) => {
+                    eprintln!(
+                        "Failed to set some values on validator {} (e.g., builder, enabled or gas limit). \
+                        These values value may need to be set manually. Continuing with other validators. \
+                        Error was {:?}",
+                        i, e
+                    );
+                    // Continue onto the next validator.
+                    break;
+                }
+            }
+            eprintln!(
+                "Uploaded keystore {} of {} to the destination VC",
+                i + 1,
+                count
+            );
+        }
+    }
+
+    eprintln!("Done.");
+
+    Ok(())
+}
+
+async fn sleep_with_retry_message(pubkey: &PublicKeyBytes, path: Option<&str>) {
+    let path = path.unwrap_or("<unspecified>");
+    eprintln!(
+        "Sleeping for {:?} before retrying. Exiting the application before it completes \
+        may result in the loss of a validator keystore. The keystore would need to be \
+        restored from a backup or mnemonic. The keystore which may be lost has a public \
+        key of {:?} and a derivation path of {}",
+        UPLOAD_RETRY_WAIT, pubkey, path
+    );
+    sleep(UPLOAD_RETRY_WAIT).await
+}
+
+// The tests use crypto and are too slow in debug.
+#[cfg(not(debug_assertions))]
+#[cfg(test)]
+mod test {
+    use super::*;
+    use crate::import_validators::tests::TestBuilder as ImportTestBuilder;
+    use account_utils::validator_definitions::SigningDefinition;
+    use std::fs;
+    use tempfile::{tempdir, TempDir};
+    use validator_client::http_api::{test_utils::ApiTester, Config as HttpConfig};
+
+    const SRC_VC_TOKEN_FILE_NAME: &str = "src_vc_token.json";
+    const DEST_VC_TOKEN_FILE_NAME: &str = "dest_vc_token.json";
+
+    type MutatePasswordFn = Box<dyn Fn(&mut HashMap<PublicKeyBytes, Vec<String>>)>;
+
+    struct TestBuilder {
+        src_import_builder: Option<ImportTestBuilder>,
+        dest_import_builder: Option<ImportTestBuilder>,
+        http_config: HttpConfig,
+        duplicates: usize,
+        dir: TempDir,
+        move_back_again: bool,
+        remove_passwords_from_src_vc: bool,
+        mutate_passwords: Option<MutatePasswordFn>,
+        passwords: HashMap<PublicKeyBytes, Vec<String>>,
+        use_password_files: bool,
+        reuse_password_files: Option<usize>,
+    }
+
+    impl TestBuilder {
+        async fn new() -> Self {
+            let dir = tempdir().unwrap();
+            Self {
+                src_import_builder: None,
+                dest_import_builder: None,
+                http_config: ApiTester::default_http_config(),
+                duplicates: 0,
+                dir,
+                move_back_again: false,
+                remove_passwords_from_src_vc: false,
+                mutate_passwords: None,
+                passwords: <_>::default(),
+                use_password_files: false,
+                reuse_password_files: None,
+            }
+        }
+
+        fn move_back_again(mut self) -> Self {
+            self.move_back_again = true;
+            self
+        }
+
+        fn use_password_files(mut self) -> Self {
+            self.use_password_files = true;
+            self.http_config.store_passwords_in_secrets_dir = true;
+            self
+        }
+
+        fn reuse_password_files(mut self, index: usize) -> Self {
+            self.reuse_password_files = Some(index);
+            self
+        }
+
+        async fn with_src_validators(mut self, count: u32, first_index: u32) -> Self {
+            let builder = ImportTestBuilder::new_with_http_config(self.http_config.clone())
+                .await
+                .create_validators(count, first_index)
+                .await;
+            self.src_import_builder = Some(builder);
+            self
+        }
+
+        async fn with_dest_validators(mut self, count: u32, first_index: u32) -> Self {
+            let builder = ImportTestBuilder::new_with_http_config(self.http_config.clone())
+                .await
+                .create_validators(count, first_index)
+                .await;
+            self.dest_import_builder = Some(builder);
+            self
+        }
+
+        fn register_duplicates(mut self, num_duplicates: usize) -> Self {
+            self.duplicates = num_duplicates;
+            self
+        }
+
+        fn remove_passwords_from_src_vc(mut self) -> Self {
+            self.remove_passwords_from_src_vc = true;
+            self
+        }
+
+        fn mutate_passwords<F: Fn(&mut HashMap<PublicKeyBytes, Vec<String>>) + 'static>(
+            mut self,
+            func: F,
+        ) -> Self {
+            self.mutate_passwords = Some(Box::new(func));
+            self
+        }
+
+        async fn move_validators<F>(
+            &self,
+            gen_validators_enum: F,
+            src_vc: &ApiTester,
+            dest_vc: &ApiTester,
+        ) -> Result<(), String>
+        where
+            F: Fn(&[PublicKeyBytes]) -> Validators,
+        {
+            let src_vc_token_path = self.dir.path().join(SRC_VC_TOKEN_FILE_NAME);
+            fs::write(&src_vc_token_path, &src_vc.api_token).unwrap();
+            let (src_vc_client, src_vc_initial_keystores) =
+                vc_http_client(src_vc.url.clone(), &src_vc_token_path)
+                    .await
+                    .unwrap();
+
+            let src_vc_initial_pubkeys: Vec<_> = src_vc_initial_keystores
+                .iter()
+                .map(|k| k.validating_pubkey)
+                .collect();
+            let validators = gen_validators_enum(&src_vc_initial_pubkeys);
+
+            let dest_vc_token_path = self.dir.path().join(DEST_VC_TOKEN_FILE_NAME);
+            fs::write(&dest_vc_token_path, &dest_vc.api_token).unwrap();
+
+            let (dest_vc_client, dest_vc_initial_keystores) =
+                vc_http_client(dest_vc.url.clone(), &dest_vc_token_path)
+                    .await
+                    .unwrap();
+
+            let move_config = MoveConfig {
+                src_vc_url: src_vc.url.clone(),
+                src_vc_token_path,
+                dest_vc_url: dest_vc.url.clone(),
+                dest_vc_token_path: dest_vc_token_path.clone(),
+                validators: validators.clone(),
+                builder_proposals: None,
+                fee_recipient: None,
+                gas_limit: None,
+                password_source: PasswordSource::Testing(self.passwords.clone()),
+            };
+
+            let result = run(move_config).await;
+
+            if result.is_ok() {
+                let src_vc_final_keystores = src_vc_client.get_keystores().await.unwrap().data;
+                let dest_vc_final_keystores = dest_vc_client.get_keystores().await.unwrap().data;
+
+                src_vc.ensure_key_cache_consistency().await;
+                dest_vc.ensure_key_cache_consistency().await;
+
+                match validators {
+                    Validators::All => {
+                        assert!(
+                            src_vc_final_keystores.is_empty(),
+                            "all keystores should be removed from source vc"
+                        );
+                        assert_eq!(
+                            dest_vc_final_keystores.len(),
+                            dest_vc_initial_keystores.len() + src_vc_initial_keystores.len()
+                                - self.duplicates,
+                            "the correct count of keystores should have been moved to the dest"
+                        );
+                        for initial_keystore in &src_vc_initial_keystores {
+                            assert!(
+                                dest_vc_final_keystores.contains(initial_keystore),
+                                "the source keystore should be present at the dest"
+                            );
+                            assert!(
+                                !src_vc
+                                    .secrets_dir
+                                    .path()
+                                    .join(format!("{:?}", initial_keystore.validating_pubkey))
+                                    .exists(),
+                                "the source password file should be deleted"
+                            )
+                        }
+                    }
+                    Validators::Count(count) => {
+                        assert_eq!(
+                            src_vc_final_keystores.len(),
+                            src_vc_initial_keystores.len() - count,
+                            "keystores should be removed from source vc"
+                        );
+                        assert_eq!(
+                            dest_vc_final_keystores.len(),
+                            dest_vc_initial_keystores.len() + count - self.duplicates,
+                            "the correct count of keystores should have been moved to the dest"
+                        );
+                        let moved_keystores: Vec<_> = {
+                            let initial_set: HashSet<_> = src_vc_initial_keystores.iter().collect();
+                            let final_set: HashSet<_> = src_vc_final_keystores.iter().collect();
+                            initial_set.difference(&final_set).cloned().collect()
+                        };
+                        assert_eq!(moved_keystores.len(), count);
+                        for moved_keystore in &moved_keystores {
+                            assert!(
+                                dest_vc_final_keystores.contains(moved_keystore),
+                                "the moved keystore should be present at the dest"
+                            );
+                            assert!(
+                                !src_vc
+                                    .secrets_dir
+                                    .path()
+                                    .join(format!("{:?}", moved_keystore.validating_pubkey))
+                                    .exists(),
+                                "the source password file should be deleted"
+                            )
+                        }
+                    }
+                    Validators::Specific(pubkeys) => {
+                        assert_eq!(
+                            src_vc_final_keystores.len(),
+                            src_vc_initial_keystores
+                                .len()
+                                .checked_sub(pubkeys.len())
+                                .unwrap(),
+                            "the correct count of validators should have been removed from the src"
+                        );
+                        assert_eq!(
+                            dest_vc_final_keystores.len(),
+                            dest_vc_initial_keystores.len() + pubkeys.len() - self.duplicates,
+                            "the correct count of keystores should have been moved to the dest"
+                        );
+                        for pubkey in pubkeys {
+                            let initial_keystore = src_vc_initial_keystores
+                                .iter()
+                                .find(|k| k.validating_pubkey == pubkey)
+                                .unwrap();
+                            assert!(
+                                !src_vc_final_keystores.contains(initial_keystore),
+                                "the keystore should not be present at the source"
+                            );
+                            assert!(
+                                dest_vc_final_keystores.contains(initial_keystore),
+                                "the keystore should be present at the dest"
+                            );
+                            if self.reuse_password_files.is_some() {
+                                assert!(
+                                src_vc
+                                    .secrets_dir
+                                    .path()
+                                    .join(format!("{:?}", pubkey))
+                                    .exists(),
+                                "the source password file was used by another validator and should not be deleted"
+                            )
+                            } else {
+                                assert!(
+                                    !src_vc
+                                        .secrets_dir
+                                        .path()
+                                        .join(format!("{:?}", pubkey))
+                                        .exists(),
+                                    "the source password file should be deleted"
+                                )
+                            }
+                        }
+                    }
+                }
+
+                // If enabled, check that all VCs still have the password files for their validators.
+                if self.use_password_files {
+                    src_vc_final_keystores
+                        .iter()
+                        .map(|keystore| (&src_vc, keystore))
+                        .chain(
+                            dest_vc_final_keystores
+                                .iter()
+                                .map(|keystore| (&dest_vc, keystore)),
+                        )
+                        .for_each(|(vc, keystore)| {
+                            assert!(
+                                vc.secrets_dir
+                                    .path()
+                                    .join(format!("{:?}", keystore.validating_pubkey))
+                                    .exists(),
+                                "the password file should exist"
+                            )
+                        });
+                }
+            }
+
+            result
+        }
+
+        async fn run_test<F>(mut self, gen_validators_enum: F) -> TestResult
+        where
+            F: Fn(&[PublicKeyBytes]) -> Validators + Copy,
+        {
+            let src_vc = if let Some(import_builder) = self.src_import_builder.take() {
+                let import_test_result = import_builder.run_test().await;
+                assert!(import_test_result.result.is_ok());
+                import_test_result.vc
+            } else {
+                ApiTester::new_with_http_config(self.http_config.clone()).await
+            };
+
+            // If enabled, set all the validator definitions on the src_vc to
+            // use the same password path as the given `master_index`. This
+            // helps test that we don't delete a password file if it's in use by
+            // another validator.
+            if let Some(primary_index) = self.reuse_password_files {
+                let mut initialized_validators = src_vc.initialized_validators.write();
+                let definitions = initialized_validators.as_mut_slice_testing_only();
+                // Find the path of the "primary" definition.
+                let primary_path = definitions
+                    .get(primary_index)
+                    .map(|def| match &def.signing_definition {
+                        SigningDefinition::LocalKeystore {
+                            voting_keystore_password_path: Some(path),
+                            ..
+                        } => path.clone(),
+                        _ => panic!("primary index does not have password path"),
+                    })
+                    .unwrap();
+                // Set all definitions to use the same password path as the primary.
+                definitions.iter_mut().enumerate().for_each(|(_, def)| {
+                    match &mut def.signing_definition {
+                        SigningDefinition::LocalKeystore {
+                            voting_keystore_password_path: Some(path),
+                            ..
+                        } => *path = primary_path.clone(),
+                        _ => (),
+                    }
+                })
+            }
+
+            let dest_vc = if let Some(import_builder) = self.dest_import_builder.take() {
+                let import_test_result = import_builder.run_test().await;
+                assert!(import_test_result.result.is_ok());
+                import_test_result.vc
+            } else {
+                ApiTester::new_with_http_config(self.http_config.clone()).await
+            };
+
+            if self.remove_passwords_from_src_vc {
+                let passwords = src_vc
+                    .initialized_validators
+                    .write()
+                    .delete_passwords_from_validator_definitions()
+                    .unwrap();
+
+                self.passwords = passwords
+                    .into_iter()
+                    .map(|(pubkey, password)| {
+                        (
+                            PublicKeyBytes::from(&pubkey),
+                            vec![password.as_str().to_string()],
+                        )
+                    })
+                    .collect();
+
+                if let Some(func) = self.mutate_passwords.take() {
+                    func(&mut self.passwords)
+                }
+            }
+
+            let result = self
+                .move_validators(gen_validators_enum, &src_vc, &dest_vc)
+                .await;
+
+            if self.move_back_again {
+                self.move_validators(gen_validators_enum, &dest_vc, &src_vc)
+                    .await
+                    .unwrap();
+            }
+
+            TestResult { result }
+        }
+    }
+
+    #[must_use] // Use the `assert_ok` or `assert_err` fns to "use" this value.
+    struct TestResult {
+        result: Result<(), String>,
+    }
+
+    impl TestResult {
+        fn assert_ok(self) {
+            assert_eq!(self.result, Ok(()))
+        }
+
+        fn assert_err(self) {
+            assert!(self.result.is_err())
+        }
+
+        fn assert_err_is(self, msg: String) {
+            assert_eq!(self.result, Err(msg))
+        }
+    }
+
+    #[tokio::test]
+    async fn no_validators() {
+        TestBuilder::new()
+            .await
+            .run_test(|_| Validators::All)
+            .await
+            .assert_err_is(NO_VALIDATORS_MSG.to_string());
+    }
+
+    #[tokio::test]
+    async fn one_validator_move_all() {
+        TestBuilder::new()
+            .await
+            .with_src_validators(1, 0)
+            .await
+            .run_test(|_| Validators::All)
+            .await
+            .assert_ok();
+    }
+
+    #[tokio::test]
+    async fn one_validator_move_one() {
+        TestBuilder::new()
+            .await
+            .with_src_validators(1, 0)
+            .await
+            .run_test(|pubkeys| Validators::Specific(pubkeys.to_vec()))
+            .await
+            .assert_ok();
+    }
+
+    #[tokio::test]
+    async fn one_validator_to_non_empty_dest() {
+        TestBuilder::new()
+            .await
+            .with_src_validators(1, 0)
+            .await
+            .with_dest_validators(1, 10)
+            .await
+            .run_test(|_| Validators::All)
+            .await
+            .assert_ok();
+    }
+
+    #[tokio::test]
+    async fn two_validators_move_all_where_one_is_a_duplicate() {
+        TestBuilder::new()
+            .await
+            .with_src_validators(2, 0)
+            .await
+            .with_dest_validators(1, 1)
+            .await
+            .register_duplicates(1)
+            .run_test(|_| Validators::All)
+            .await
+            .assert_ok();
+    }
+
+    #[tokio::test]
+    async fn two_validators_move_one_where_one_is_a_duplicate() {
+        TestBuilder::new()
+            .await
+            .with_src_validators(2, 0)
+            .await
+            .with_dest_validators(2, 0)
+            .await
+            .register_duplicates(1)
+            .run_test(|pubkeys| Validators::Specific(pubkeys[0..1].to_vec()))
+            .await
+            .assert_ok();
+    }
+
+    #[tokio::test]
+    async fn three_validators_move_all() {
+        TestBuilder::new()
+            .await
+            .with_src_validators(3, 0)
+            .await
+            .run_test(|_| Validators::All)
+            .await
+            .assert_ok();
+    }
+
+    #[tokio::test]
+    async fn three_validators_move_one() {
+        TestBuilder::new()
+            .await
+            .with_src_validators(3, 0)
+            .await
+            .run_test(|pubkeys| Validators::Specific(pubkeys[0..1].to_vec()))
+            .await
+            .assert_ok();
+    }
+
+    #[tokio::test]
+    async fn three_validators_move_two() {
+        TestBuilder::new()
+            .await
+            .with_src_validators(3, 0)
+            .await
+            .run_test(|pubkeys| Validators::Specific(pubkeys[0..2].to_vec()))
+            .await
+            .assert_ok();
+    }
+
+    #[tokio::test]
+    async fn three_validators_move_three() {
+        TestBuilder::new()
+            .await
+            .with_src_validators(3, 42)
+            .await
+            .run_test(|pubkeys| Validators::Specific(pubkeys.to_vec()))
+            .await
+            .assert_ok();
+    }
+
+    #[tokio::test]
+    async fn three_validators_move_one_by_count() {
+        TestBuilder::new()
+            .await
+            .with_src_validators(3, 0)
+            .await
+            .run_test(|_| Validators::Count(1))
+            .await
+            .assert_ok();
+    }
+
+    #[tokio::test]
+    async fn three_validators_move_two_by_count() {
+        TestBuilder::new()
+            .await
+            .with_src_validators(3, 0)
+            .await
+            .run_test(|_| Validators::Count(2))
+            .await
+            .assert_ok();
+    }
+
+    #[tokio::test]
+    async fn one_validators_move_two_by_count() {
+        TestBuilder::new()
+            .await
+            .with_src_validators(1, 0)
+            .await
+            .run_test(|_| Validators::Count(2))
+            .await
+            .assert_err();
+    }
+
+    #[tokio::test]
+    async fn two_validator_move_all_and_back_again() {
+        TestBuilder::new()
+            .await
+            .with_src_validators(2, 0)
+            .await
+            .move_back_again()
+            .run_test(|_| Validators::All)
+            .await
+            .assert_ok();
+    }
+
+    #[tokio::test]
+    async fn two_validator_move_all_passwords_removed() {
+        TestBuilder::new()
+            .await
+            .with_src_validators(2, 0)
+            .await
+            .remove_passwords_from_src_vc()
+            .run_test(|_| Validators::All)
+            .await
+            .assert_ok();
+    }
+
+    /// This test simulates a src VC that doesn't know the keystore passwords
+    /// and provide the wrong password before providing the correct password.
+    #[tokio::test]
+    async fn two_validator_move_all_passwords_removed_failed_password_attempt() {
+        TestBuilder::new()
+            .await
+            .with_src_validators(2, 0)
+            .await
+            .remove_passwords_from_src_vc()
+            .mutate_passwords(|passwords| {
+                passwords.iter_mut().for_each(|(_, passwords)| {
+                    passwords.insert(0, "wrong-password".to_string());
+                    passwords.push("wrong-password".to_string());
+                })
+            })
+            .run_test(|_| Validators::All)
+            .await
+            .assert_ok();
+    }
+
+    /// This test simulates a src VC that doesn't know the keystore passwords
+    /// and we have not provided the correct password.
+    #[should_panic]
+    #[tokio::test]
+    async fn two_validator_move_all_passwords_removed_without_correct_password() {
+        TestBuilder::new()
+            .await
+            .with_src_validators(2, 0)
+            .await
+            .remove_passwords_from_src_vc()
+            .mutate_passwords(|passwords| {
+                passwords
+                    .iter_mut()
+                    .for_each(|(_, passwords)| *passwords = vec!["wrong-password".to_string()])
+            })
+            .run_test(|_| Validators::All)
+            .await
+            .assert_ok();
+    }
+
+    #[tokio::test]
+    async fn one_validator_move_all_with_password_files() {
+        TestBuilder::new()
+            .await
+            .use_password_files()
+            .with_src_validators(1, 0)
+            .await
+            .run_test(|_| Validators::All)
+            .await
+            .assert_ok();
+    }
+
+    #[tokio::test]
+    async fn two_validators_move_one_with_identical_password_files() {
+        TestBuilder::new()
+            .await
+            .use_password_files()
+            // The password file for validator 0 will be shared with other
+            // validators on the src vc.
+            .reuse_password_files(0)
+            .with_src_validators(2, 0)
+            .await
+            .run_test(|validators| Validators::Specific(validators[0..1].to_vec()))
+            .await
+            .assert_ok();
+    }
+}
diff --git a/validator_manager/test_vectors/.gitignore b/validator_manager/test_vectors/.gitignore
new file mode 100644
index 0000000000..3fec32c842
--- /dev/null
+++ b/validator_manager/test_vectors/.gitignore
@@ -0,0 +1 @@
+tmp/
diff --git a/validator_manager/test_vectors/generate.py b/validator_manager/test_vectors/generate.py
new file mode 100644
index 0000000000..722414de73
--- /dev/null
+++ b/validator_manager/test_vectors/generate.py
@@ -0,0 +1,123 @@
+# This script uses the `ethereum/staking-deposit-cli` tool to generate
+# deposit data files which are then used for testing by Lighthouse.
+#
+# To generate vectors, simply run this Python script:
+#
+# `python generate.py`
+#
+import os
+import sys
+import shutil
+import subprocess
+from subprocess import Popen, PIPE, STDOUT
+
+
+NUM_VALIDATORS=3
+TEST_MNEMONIC = "test test test test test test test test test test test waste"
+WALLET_NAME="test_wallet"
+
+
+tmp_dir = os.path.join(".", "tmp")
+mnemonic_path = os.path.join(tmp_dir, "mnemonic.txt")
+sdc_dir = os.path.join(tmp_dir, "sdc")
+sdc_git_dir = os.path.join(sdc_dir, "staking-deposit-cli")
+vectors_dir = os.path.join(".", "vectors")
+
+
+def setup():
+    cleanup()
+
+    if os.path.exists(vectors_dir):
+        shutil.rmtree(vectors_dir)
+
+    os.mkdir(tmp_dir)
+    os.mkdir(sdc_dir)
+    os.mkdir(vectors_dir)
+
+    setup_sdc()
+    with open(mnemonic_path, "x") as file:
+        file.write(TEST_MNEMONIC)
+
+
+def cleanup():
+    if os.path.exists(tmp_dir):
+        shutil.rmtree(tmp_dir)
+
+    # Remove all the keystores since we don't use them in testing.
+    if os.path.exists(vectors_dir):
+        for root, dirs, files in os.walk(vectors_dir):
+            for file in files:
+                if file.startswith("keystore"):
+                    os.remove(os.path.join(root, file))
+
+
+def setup_sdc():
+    result = subprocess.run([
+        "git",
+        "clone",
+        "--single-branch",
+        "https://github.com/ethereum/staking-deposit-cli.git",
+        str(sdc_git_dir)
+    ])
+    assert(result.returncode == 0)
+    result = subprocess.run([
+        "pip",
+        "install",
+        "-r",
+        "requirements.txt",
+    ], cwd=sdc_git_dir)
+    assert(result.returncode == 0)
+    result = subprocess.run([
+        "python",
+        "setup.py",
+        "install",
+    ], cwd=sdc_git_dir)
+    assert(result.returncode == 0)
+
+
+def sdc_generate(network, first_index, count, eth1_withdrawal_address=None):
+    if eth1_withdrawal_address is not None:
+        eth1_flags = ['--eth1_withdrawal_address', eth1_withdrawal_address]
+        uses_eth1 = True
+    else:
+        eth1_flags = []
+        uses_eth1 = False
+
+    test_name = "{}_first_{}_count_{}_eth1_{}".format(network, first_index, count,
+                                                      str(uses_eth1).lower())
+    output_dir = os.path.join(vectors_dir, test_name)
+    os.mkdir(output_dir)
+
+    command = [
+        '/bin/sh',
+        'deposit.sh',
+        '--language', 'english',
+        '--non_interactive',
+        'existing-mnemonic',
+        '--validator_start_index', str(first_index),
+        '--num_validators', str(count),
+        '--mnemonic', TEST_MNEMONIC,
+        '--chain', network,
+        '--keystore_password', 'MyPassword',
+        '--folder', os.path.abspath(output_dir),
+    ] + eth1_flags
+
+    print("Running " + test_name)
+    process = Popen(command, cwd=sdc_git_dir, text=True, stdin = PIPE)
+    process.wait()
+
+
+def test_network(network):
+    sdc_generate(network, first_index=0, count=1)
+    sdc_generate(network, first_index=0, count=2)
+    sdc_generate(network, first_index=12, count=1)
+    sdc_generate(network, first_index=99, count=2)
+    sdc_generate(network, first_index=1024, count=3)
+    sdc_generate(network, first_index=0, count=2,
+                 eth1_withdrawal_address="0x0f51bb10119727a7e5ea3538074fb341f56b09ad")
+
+
+setup()
+test_network("mainnet")
+test_network("prater")
+cleanup()
diff --git a/validator_manager/test_vectors/vectors/mainnet_first_0_count_1_eth1_false/validator_keys/deposit_data-1660803666.json b/validator_manager/test_vectors/vectors/mainnet_first_0_count_1_eth1_false/validator_keys/deposit_data-1660803666.json
new file mode 100644
index 0000000000..31c00c57f2
--- /dev/null
+++ b/validator_manager/test_vectors/vectors/mainnet_first_0_count_1_eth1_false/validator_keys/deposit_data-1660803666.json
@@ -0,0 +1 @@
+[{"pubkey": "88b6b3a9b391fa5593e8bce8d06102df1a56248368086929709fbb4a8570dc6a560febeef8159b19789e9c1fd13572f0", "withdrawal_credentials": "0049b6188ed20314309f617dd4030b8ddfac3c6e65759a03c226a13b2fe4cc72", "amount": 32000000000, "signature": "8ac88247c1b431a2d1eb2c5f00e7b8467bc21d6dc267f1af9ef727a12e32b4299e3b289ae5734a328b3202478dd746a80bf9e15a2217240dca1fc1b91a6b7ff7a0f5830d9a2610c1c30f19912346271357c21bd9af35a74097ebbdda2ddaf491", "deposit_message_root": "a9bc1d21cc009d9b10782a07213e37592c0d235463ed0117dec755758da90d51", "deposit_data_root": "807a20b2801eabfd9065c1b74ed6ae3e991a1ab770e4eaf268f30b37cfd2cbd7", "fork_version": "00000000", "network_name": "mainnet", "deposit_cli_version": "2.3.0"}]
\ No newline at end of file
diff --git a/validator_manager/test_vectors/vectors/mainnet_first_0_count_2_eth1_false/validator_keys/deposit_data-1660803669.json b/validator_manager/test_vectors/vectors/mainnet_first_0_count_2_eth1_false/validator_keys/deposit_data-1660803669.json
new file mode 100644
index 0000000000..2880b7724c
--- /dev/null
+++ b/validator_manager/test_vectors/vectors/mainnet_first_0_count_2_eth1_false/validator_keys/deposit_data-1660803669.json
@@ -0,0 +1 @@
+[{"pubkey": "88b6b3a9b391fa5593e8bce8d06102df1a56248368086929709fbb4a8570dc6a560febeef8159b19789e9c1fd13572f0", "withdrawal_credentials": "0049b6188ed20314309f617dd4030b8ddfac3c6e65759a03c226a13b2fe4cc72", "amount": 32000000000, "signature": "8ac88247c1b431a2d1eb2c5f00e7b8467bc21d6dc267f1af9ef727a12e32b4299e3b289ae5734a328b3202478dd746a80bf9e15a2217240dca1fc1b91a6b7ff7a0f5830d9a2610c1c30f19912346271357c21bd9af35a74097ebbdda2ddaf491", "deposit_message_root": "a9bc1d21cc009d9b10782a07213e37592c0d235463ed0117dec755758da90d51", "deposit_data_root": "807a20b2801eabfd9065c1b74ed6ae3e991a1ab770e4eaf268f30b37cfd2cbd7", "fork_version": "00000000", "network_name": "mainnet", "deposit_cli_version": "2.3.0"}, {"pubkey": "a33ab9d93fb53c4f027944aaa11a13be0c150b7cc2e379d85d1ed4db38d178b4e4ebeae05832158b8c746c1961da00ce", "withdrawal_credentials": "00ad3748cbd1adc855c2bdab431f7e755a21663f4f6447ac888e5855c588af5a", "amount": 32000000000, "signature": "84b9fc8f260a1488c4c9a438f875edfa2bac964d651b2bc886d8442829b13f89752e807c8ca9bae9d50b1b506d3a64730015dd7f91e271ff9c1757d1996dcf6082fe5205cf6329fa2b6be303c21b66d75be608757a123da6ee4a4f14c01716d7", "deposit_message_root": "c5271aba974c802ff5b02b11fa33b545d7f430ff3b85c0f9eeef4cd59d83abf3", "deposit_data_root": "cd991ea8ff32e6b3940aed43b476c720fc1abd3040893b77a8a3efb306320d4c", "fork_version": "00000000", "network_name": "mainnet", "deposit_cli_version": "2.3.0"}]
\ No newline at end of file
diff --git a/validator_manager/test_vectors/vectors/mainnet_first_0_count_2_eth1_true/validator_keys/deposit_data-1660803684.json b/validator_manager/test_vectors/vectors/mainnet_first_0_count_2_eth1_true/validator_keys/deposit_data-1660803684.json
new file mode 100644
index 0000000000..da92a1d0d9
--- /dev/null
+++ b/validator_manager/test_vectors/vectors/mainnet_first_0_count_2_eth1_true/validator_keys/deposit_data-1660803684.json
@@ -0,0 +1 @@
+[{"pubkey": "88b6b3a9b391fa5593e8bce8d06102df1a56248368086929709fbb4a8570dc6a560febeef8159b19789e9c1fd13572f0", "withdrawal_credentials": "0100000000000000000000000f51bb10119727a7e5ea3538074fb341f56b09ad", "amount": 32000000000, "signature": "a8461b58a5a5a0573c4af37da6ee4ba63e35894cffad6797d4a2c80f8f2c79d2c30c0de0299d8edde76e0c3f3e6d4f1e03cc377969f56d8760717d6e86f9316da9375573ce7bb87a8520daedb13c49284377f7a4f64a70aa2ca44b1581d47e20", "deposit_message_root": "62967565d11471da4af7769911926cd1826124048036b25616216f99bc320f13", "deposit_data_root": "d26d642a880ff8a109260fe69681840f6e1868c8c1cd2163a1db5a094e8db03a", "fork_version": "00000000", "network_name": "mainnet", "deposit_cli_version": "2.3.0"}, {"pubkey": "a33ab9d93fb53c4f027944aaa11a13be0c150b7cc2e379d85d1ed4db38d178b4e4ebeae05832158b8c746c1961da00ce", "withdrawal_credentials": "0100000000000000000000000f51bb10119727a7e5ea3538074fb341f56b09ad", "amount": 32000000000, "signature": "93a398c09143203beb94c9223c7e18f36e5ea36090875284b222c2fcb16982e6f2e26f27ca9d30e3c6f6b5ad44857fc50f531925f4736810712f68a9d7a9c0eb664a851180f3b7d2e44a35717d43b3d3e4fd555354fa1dfa92f451870f36084d", "deposit_message_root": "ce110433298ffb78d827d67dcc13655344a139cb7e3ce10b341937c0a76b25b7", "deposit_data_root": "7c7617a2c11870ec49e975b3691b9f822d63938df38555161e23aa245b150c66", "fork_version": "00000000", "network_name": "mainnet", "deposit_cli_version": "2.3.0"}]
\ No newline at end of file
diff --git a/validator_manager/test_vectors/vectors/mainnet_first_1024_count_3_eth1_false/validator_keys/deposit_data-1660803679.json b/validator_manager/test_vectors/vectors/mainnet_first_1024_count_3_eth1_false/validator_keys/deposit_data-1660803679.json
new file mode 100644
index 0000000000..9cc01dc0df
--- /dev/null
+++ b/validator_manager/test_vectors/vectors/mainnet_first_1024_count_3_eth1_false/validator_keys/deposit_data-1660803679.json
@@ -0,0 +1 @@
+[{"pubkey": "92ca8dddba4ae7ada6584c377fc53fb978ad9d5ee8db585b18e226c27682b326b3c68e10f5d99a453e233268c144e0ef", "withdrawal_credentials": "00dd4f8bfd1a48be288c2af8bb7315f6198900b5b3f56df010420d5328e682cb", "amount": 32000000000, "signature": "a0a96851892b257c032284928641021e58e0bcd277c3da5a2c41bcce6633d144781e4761261138277b5a8cf0ead59cce073e5a3bbc4704a37abf8cd1e290dc52e56cb0c334303945ebbb79be453c8177937e44e08f980679f1a2997fe58d2d86", "deposit_message_root": "5421d9177b4d035e6525506509ab702c5f458c53458dad437097b37cb8209b43", "deposit_data_root": "2bedaf48f8315d8631defc97c1c4c05a8152e2dc3fe779fc8e800dd67bd839a2", "fork_version": "00000000", "network_name": "mainnet", "deposit_cli_version": "2.3.0"}, {"pubkey": "86474cd2874663445ef0ee02aca81b2b942a383fd4c7085fa675388e26c67afc0fef44a8666d46f571723e349ae4a0cb", "withdrawal_credentials": "001c31aa161ed1d3c481c1ee8f3ad1853217296a15877917fe3c2f680580ac01", "amount": 32000000000, "signature": "b469179ad8ba9d6ad71b99a3c7ae662d9b77cca3ee53b20ab2eb20beee31874ad47224e94e75578fa6ecd30c1d40a0b300053817f934169d84425691edf13216445fbc6dd9b0953ad3af20c834fba63c1f50c0b0f92dd8bf383cd2cc8e0431f1", "deposit_message_root": "279271f7065c83868c37021c32c014516b21e6188fb2cee4e8543c5d38427698", "deposit_data_root": "69862477671957ab0b3f1167c5cd550c107132a0079eb70eaa4bc5c5fe06b5a0", "fork_version": "00000000", "network_name": "mainnet", "deposit_cli_version": "2.3.0"}, {"pubkey": "997e27aa262238beb01464434694a466321b5270297bdfdb944b65a3b6617b6ce2613628ac35a8f4cf2e9b4b55c46ef8", "withdrawal_credentials": "0097fffee9cf9fd91a6fa89af90e73f1cb8b8a043e742afaeb2e57b83b0845fe", "amount": 32000000000, "signature": "a8b05626657ce5b1801e0824aaeb21de2e1a11bc16cad6100ac911bcb873aaf7e7282f1f8465df4aaea998a1a4e1645f075e7e65f8c6b8688b0162f86be2128541f91fc9feb628bcab3b4afec1f7aeccaba04aaa54dc17c738233d360f94b97e", "deposit_message_root": "187e177721bfdd8ea13cb52c8de2dead29164a0e093efb640457a0e6ac918191", "deposit_data_root": "34ef32901d793cd9a0a3d93e7ee40e7be9abe6fb26f0b49a86b8ff29dc649930", "fork_version": "00000000", "network_name": "mainnet", "deposit_cli_version": "2.3.0"}]
\ No newline at end of file
diff --git a/validator_manager/test_vectors/vectors/mainnet_first_12_count_1_eth1_false/validator_keys/deposit_data-1660803672.json b/validator_manager/test_vectors/vectors/mainnet_first_12_count_1_eth1_false/validator_keys/deposit_data-1660803672.json
new file mode 100644
index 0000000000..3a971d0959
--- /dev/null
+++ b/validator_manager/test_vectors/vectors/mainnet_first_12_count_1_eth1_false/validator_keys/deposit_data-1660803672.json
@@ -0,0 +1 @@
+[{"pubkey": "8b181759a027c09a409ef24f6b35db213982c2474e2017f3851d76b1c4e560a4238072f67a0c22cb667f940da4ea9ec9", "withdrawal_credentials": "00cbec90e8570679f565bd4645f73a078981067a705564283e61c93c81707842", "amount": 32000000000, "signature": "a57299cde3c2ea8dc17ad3ce5a38a5f6de69d198599150dc4df02624ba1d8672440d02c0d27c3dc3b8c9f86c679571ab14c798426acd9b059895f1f5887bdee805fb4e31bd8f93ec9e78403c23d7924f23eae6af056154f35fee03bf9ffe0e98", "deposit_message_root": "fcdf3d94740766299a95b3e477e64abadff6ab8978400578f241c93eb367b938", "deposit_data_root": "246619823b45d80f53a30404542ec4be447d4e268cc0afcdf480e6a846d58411", "fork_version": "00000000", "network_name": "mainnet", "deposit_cli_version": "2.3.0"}]
\ No newline at end of file
diff --git a/validator_manager/test_vectors/vectors/mainnet_first_99_count_2_eth1_false/validator_keys/deposit_data-1660803675.json b/validator_manager/test_vectors/vectors/mainnet_first_99_count_2_eth1_false/validator_keys/deposit_data-1660803675.json
new file mode 100644
index 0000000000..2efa5c4ec8
--- /dev/null
+++ b/validator_manager/test_vectors/vectors/mainnet_first_99_count_2_eth1_false/validator_keys/deposit_data-1660803675.json
@@ -0,0 +1 @@
+[{"pubkey": "a57a4ed429e415b862cc758e75c93936e3f6339640d0763b969ba133a82c03717827fbdd8ec42fc862ed50e3b5b528dc", "withdrawal_credentials": "00864081ef2f5aec1aa667872615e25027f1fdc256a4948b6318cf75a8d635a3", "amount": 32000000000, "signature": "8ca8a6f30b4346d7b9912e3dcd820652bc472511f89d91fd102acfb0c8df1cfc7a2629f44170727e126e88f2847fe5c9081b13fb0838a2b2343a95cabf16f57708fc0cf846bc5307209ae976c34500cc826ff48ab64169d8bebec99dded5dd1d", "deposit_message_root": "c08d0ecd085bc0f50c35f1b34d8b8937b2b9c8a172a9808de70f8d448c526f07", "deposit_data_root": "c0c6cd40b43ea0fe7fcc284de9acd9c1bd001bb88c059c155393af22a6c85d46", "fork_version": "00000000", "network_name": "mainnet", "deposit_cli_version": "2.3.0"}, {"pubkey": "a2801622bc391724989004b5de78cb85746f85a303572691ecc945d9f5c61ec512127e58482e0dfcb4de77be3294ab01", "withdrawal_credentials": "00edff674c66a7f58285554e700183aeee5e740691de8087f7ce4d81f3597108", "amount": 32000000000, "signature": "8c0784645c611b4f514a6519b737f2d02df3eba0e04cd30efebffcca769af8cc599ce28e4421cefe665ec31d3c34e44c174e0cca4891d8196796085e712459b45e411efecd07cf3258f1d6309a07a6dd52a0ae186e6184d37bf11cee36ec84e8", "deposit_message_root": "f5a530bee9698c2447961ecd210184fbb130bbb8e8916988d802d47e3b147842", "deposit_data_root": "c57790b77ef97318d4ec7b97ea07ea458d08209ba372bfe76171e2ece22d6130", "fork_version": "00000000", "network_name": "mainnet", "deposit_cli_version": "2.3.0"}]
\ No newline at end of file
diff --git a/validator_manager/test_vectors/vectors/prater_first_0_count_1_eth1_false/validator_keys/deposit_data-1660803687.json b/validator_manager/test_vectors/vectors/prater_first_0_count_1_eth1_false/validator_keys/deposit_data-1660803687.json
new file mode 100644
index 0000000000..c736d75b7e
--- /dev/null
+++ b/validator_manager/test_vectors/vectors/prater_first_0_count_1_eth1_false/validator_keys/deposit_data-1660803687.json
@@ -0,0 +1 @@
+[{"pubkey": "88b6b3a9b391fa5593e8bce8d06102df1a56248368086929709fbb4a8570dc6a560febeef8159b19789e9c1fd13572f0", "withdrawal_credentials": "0049b6188ed20314309f617dd4030b8ddfac3c6e65759a03c226a13b2fe4cc72", "amount": 32000000000, "signature": "a940e0142ad9b56a1310326137347d1ada275b31b3748af4accc63bd189573376615be8e8ae047766c6d10864e54b2e7098177598edf3a043eb560bbdf1a1c12588375a054d1323a0900e2286d0993cde9675e5b74523e6e8e03715cc96b3ce5", "deposit_message_root": "a9bc1d21cc009d9b10782a07213e37592c0d235463ed0117dec755758da90d51", "deposit_data_root": "28484efb20c961a1354689a556d4c352fe9deb24684efdb32d22e1af17e2a45d", "fork_version": "00001020", "network_name": "goerli", "deposit_cli_version": "2.3.0"}]
\ No newline at end of file
diff --git a/validator_manager/test_vectors/vectors/prater_first_0_count_2_eth1_false/validator_keys/deposit_data-1660803690.json b/validator_manager/test_vectors/vectors/prater_first_0_count_2_eth1_false/validator_keys/deposit_data-1660803690.json
new file mode 100644
index 0000000000..e86500d14f
--- /dev/null
+++ b/validator_manager/test_vectors/vectors/prater_first_0_count_2_eth1_false/validator_keys/deposit_data-1660803690.json
@@ -0,0 +1 @@
+[{"pubkey": "88b6b3a9b391fa5593e8bce8d06102df1a56248368086929709fbb4a8570dc6a560febeef8159b19789e9c1fd13572f0", "withdrawal_credentials": "0049b6188ed20314309f617dd4030b8ddfac3c6e65759a03c226a13b2fe4cc72", "amount": 32000000000, "signature": "a940e0142ad9b56a1310326137347d1ada275b31b3748af4accc63bd189573376615be8e8ae047766c6d10864e54b2e7098177598edf3a043eb560bbdf1a1c12588375a054d1323a0900e2286d0993cde9675e5b74523e6e8e03715cc96b3ce5", "deposit_message_root": "a9bc1d21cc009d9b10782a07213e37592c0d235463ed0117dec755758da90d51", "deposit_data_root": "28484efb20c961a1354689a556d4c352fe9deb24684efdb32d22e1af17e2a45d", "fork_version": "00001020", "network_name": "goerli", "deposit_cli_version": "2.3.0"}, {"pubkey": "a33ab9d93fb53c4f027944aaa11a13be0c150b7cc2e379d85d1ed4db38d178b4e4ebeae05832158b8c746c1961da00ce", "withdrawal_credentials": "00ad3748cbd1adc855c2bdab431f7e755a21663f4f6447ac888e5855c588af5a", "amount": 32000000000, "signature": "87b4b4e9c923aa9e1687219e9df0e838956ee6e15b7ab18142467430d00940dc7aa243c9996e85125dfe72d9dbdb00a30a36e16a2003ee0c86f29c9f5d74f12bfe5b7f62693dbf5187a093555ae8d6b48acd075788549c4b6a249b397af24cd0", "deposit_message_root": "c5271aba974c802ff5b02b11fa33b545d7f430ff3b85c0f9eeef4cd59d83abf3", "deposit_data_root": "ea80b639356a03f6f58e4acbe881fabefc9d8b93375a6aa7e530c77d7e45d3e4", "fork_version": "00001020", "network_name": "goerli", "deposit_cli_version": "2.3.0"}]
\ No newline at end of file
diff --git a/validator_manager/test_vectors/vectors/prater_first_0_count_2_eth1_true/validator_keys/deposit_data-1660803705.json b/validator_manager/test_vectors/vectors/prater_first_0_count_2_eth1_true/validator_keys/deposit_data-1660803705.json
new file mode 100644
index 0000000000..c79ae5a4fc
--- /dev/null
+++ b/validator_manager/test_vectors/vectors/prater_first_0_count_2_eth1_true/validator_keys/deposit_data-1660803705.json
@@ -0,0 +1 @@
+[{"pubkey": "88b6b3a9b391fa5593e8bce8d06102df1a56248368086929709fbb4a8570dc6a560febeef8159b19789e9c1fd13572f0", "withdrawal_credentials": "0100000000000000000000000f51bb10119727a7e5ea3538074fb341f56b09ad", "amount": 32000000000, "signature": "ab32595d8201c2b4e8173aece9151fdc15f4d2ad36008462d0416598ddbf0f37ed0877f06d284a9669e73dbc0885bd2207fe64385e95a4488dc2bcb2c324d5c20da3248a6244463583dfbba8db20805765421e59cb56b0bc3ee6d24a9218216d", "deposit_message_root": "62967565d11471da4af7769911926cd1826124048036b25616216f99bc320f13", "deposit_data_root": "b4df3a3a26dd5f6eb32999d8a7051a7d1a8573a16553d4b45ee706a0d59c1066", "fork_version": "00001020", "network_name": "goerli", "deposit_cli_version": "2.3.0"}, {"pubkey": "a33ab9d93fb53c4f027944aaa11a13be0c150b7cc2e379d85d1ed4db38d178b4e4ebeae05832158b8c746c1961da00ce", "withdrawal_credentials": "0100000000000000000000000f51bb10119727a7e5ea3538074fb341f56b09ad", "amount": 32000000000, "signature": "9655e195eda5517efe6f36bcebd45250c889a4177d7bf5fcd59598d2d03f37f038b5ee2ec079a30a8382ea42f351943f08a6f006bab9c2130db2742bd7315c8ad5aa1f03a0801c26d4c9efdef71c4c59c449c7f9b21fa62600ab8f5f1e2b938a", "deposit_message_root": "ce110433298ffb78d827d67dcc13655344a139cb7e3ce10b341937c0a76b25b7", "deposit_data_root": "7661474fba11bfb453274f62df022cab3c0b6f4a58af4400f6bce83c9cb5fcb8", "fork_version": "00001020", "network_name": "goerli", "deposit_cli_version": "2.3.0"}]
\ No newline at end of file
diff --git a/validator_manager/test_vectors/vectors/prater_first_1024_count_3_eth1_false/validator_keys/deposit_data-1660803701.json b/validator_manager/test_vectors/vectors/prater_first_1024_count_3_eth1_false/validator_keys/deposit_data-1660803701.json
new file mode 100644
index 0000000000..136dc38554
--- /dev/null
+++ b/validator_manager/test_vectors/vectors/prater_first_1024_count_3_eth1_false/validator_keys/deposit_data-1660803701.json
@@ -0,0 +1 @@
+[{"pubkey": "92ca8dddba4ae7ada6584c377fc53fb978ad9d5ee8db585b18e226c27682b326b3c68e10f5d99a453e233268c144e0ef", "withdrawal_credentials": "00dd4f8bfd1a48be288c2af8bb7315f6198900b5b3f56df010420d5328e682cb", "amount": 32000000000, "signature": "b5dae79ce8f3d7326b46f93182981c5f3d64257a457f038caa78ec8e5cc25a9fdac52c7beb221ab2a3205404131366ad18e1e13801393b3d486819e8cca96128bf1244884a91d05dced092c74bc1e7259788f30dd3432df15f3d2f629645f345", "deposit_message_root": "5421d9177b4d035e6525506509ab702c5f458c53458dad437097b37cb8209b43", "deposit_data_root": "94213d76aba9e6a434589d4939dd3764e0832df78f66d30db22a760c14ba1b89", "fork_version": "00001020", "network_name": "goerli", "deposit_cli_version": "2.3.0"}, {"pubkey": "86474cd2874663445ef0ee02aca81b2b942a383fd4c7085fa675388e26c67afc0fef44a8666d46f571723e349ae4a0cb", "withdrawal_credentials": "001c31aa161ed1d3c481c1ee8f3ad1853217296a15877917fe3c2f680580ac01", "amount": 32000000000, "signature": "816f38a321c4f84ad5187eda58f6d9c1fd1e81c860ed1722bdb76b920fdd430a1e814b9bb893837ae3b38ad738684fbf1795fa687f617c52121472b1ac8d2e34e5c1127186233a8833ffb54c509d9e52cb7242c6c6a65b5e496296b3caa90d89", "deposit_message_root": "279271f7065c83868c37021c32c014516b21e6188fb2cee4e8543c5d38427698", "deposit_data_root": "7ad1d059d69794680a1deef5e72c33827f0c449a5f0917095821c0343572789d", "fork_version": "00001020", "network_name": "goerli", "deposit_cli_version": "2.3.0"}, {"pubkey": "997e27aa262238beb01464434694a466321b5270297bdfdb944b65a3b6617b6ce2613628ac35a8f4cf2e9b4b55c46ef8", "withdrawal_credentials": "0097fffee9cf9fd91a6fa89af90e73f1cb8b8a043e742afaeb2e57b83b0845fe", "amount": 32000000000, "signature": "95d20c35484dea6b2a0bd7c2da2d2e810d7829e14c03657b2524adfc2111aa5ed95908ecb975ff75ff742c68ce8df417016c048959b0f807675430f6d981478e26d48e594e0830a0406da9817f8a1ecb94bd8be1f9281eeb5e952a82173c72bb", "deposit_message_root": "187e177721bfdd8ea13cb52c8de2dead29164a0e093efb640457a0e6ac918191", "deposit_data_root": "83abfb2a166f7af708526a9bdd2767c4be3cd231c9bc4e2f047a80df88a2860c", "fork_version": "00001020", "network_name": "goerli", "deposit_cli_version": "2.3.0"}]
\ No newline at end of file
diff --git a/validator_manager/test_vectors/vectors/prater_first_12_count_1_eth1_false/validator_keys/deposit_data-1660803693.json b/validator_manager/test_vectors/vectors/prater_first_12_count_1_eth1_false/validator_keys/deposit_data-1660803693.json
new file mode 100644
index 0000000000..ccd2ece069
--- /dev/null
+++ b/validator_manager/test_vectors/vectors/prater_first_12_count_1_eth1_false/validator_keys/deposit_data-1660803693.json
@@ -0,0 +1 @@
+[{"pubkey": "8b181759a027c09a409ef24f6b35db213982c2474e2017f3851d76b1c4e560a4238072f67a0c22cb667f940da4ea9ec9", "withdrawal_credentials": "00cbec90e8570679f565bd4645f73a078981067a705564283e61c93c81707842", "amount": 32000000000, "signature": "8f75836ceb390dd4fc8c16bc4be52ca09b9c5aa0ab5bc16dcfdb344787b29ddfd76d877b0a2330bc8e904b233397c6bd124845d1b868e4951cb6daacea023c986bdf0c6ac28d73f65681d941ea96623bc23acc7c84dcfc1304686240d9171cfc", "deposit_message_root": "fcdf3d94740766299a95b3e477e64abadff6ab8978400578f241c93eb367b938", "deposit_data_root": "3011f5cac32f13e86ecc061e89ed6675c27a46ab6ecb1ec6f6e5f133ae1d0287", "fork_version": "00001020", "network_name": "goerli", "deposit_cli_version": "2.3.0"}]
\ No newline at end of file
diff --git a/validator_manager/test_vectors/vectors/prater_first_99_count_2_eth1_false/validator_keys/deposit_data-1660803696.json b/validator_manager/test_vectors/vectors/prater_first_99_count_2_eth1_false/validator_keys/deposit_data-1660803696.json
new file mode 100644
index 0000000000..2ab5908307
--- /dev/null
+++ b/validator_manager/test_vectors/vectors/prater_first_99_count_2_eth1_false/validator_keys/deposit_data-1660803696.json
@@ -0,0 +1 @@
+[{"pubkey": "a57a4ed429e415b862cc758e75c93936e3f6339640d0763b969ba133a82c03717827fbdd8ec42fc862ed50e3b5b528dc", "withdrawal_credentials": "00864081ef2f5aec1aa667872615e25027f1fdc256a4948b6318cf75a8d635a3", "amount": 32000000000, "signature": "a7706e102bfb0b986a5c8050044f7e221919463149771a92c3ca46ff7d4564867db48eaf89b5237fed8db2cdb9c9c057099d0982bbdb3fbfcbe0ab7259ad3f31f7713692b78ee25e6251982e7081d049804632b70b8a24d8c3e59b624a0bd221", "deposit_message_root": "c08d0ecd085bc0f50c35f1b34d8b8937b2b9c8a172a9808de70f8d448c526f07", "deposit_data_root": "8a26fbee0c3a99fe090af1fce68afc525b4e7efa70df72abaa91f29148b2f672", "fork_version": "00001020", "network_name": "goerli", "deposit_cli_version": "2.3.0"}, {"pubkey": "a2801622bc391724989004b5de78cb85746f85a303572691ecc945d9f5c61ec512127e58482e0dfcb4de77be3294ab01", "withdrawal_credentials": "00edff674c66a7f58285554e700183aeee5e740691de8087f7ce4d81f3597108", "amount": 32000000000, "signature": "8b7aa5b0e97d15ec8c2281b919fde9e064f6ac064b163445ea99441ab063f9d10534bfde861b5606021ae46614ff075e0c2305ce5a6cbcc9f0bc8e7df1a177c4d969a5ed4ac062b0ea959bdac963fe206b73565a1a3937adcca736c6117c15f0", "deposit_message_root": "f5a530bee9698c2447961ecd210184fbb130bbb8e8916988d802d47e3b147842", "deposit_data_root": "d38575167a94b516455c5b7e36d24310a612fa0f4580446c5f9d45e4e94f0642", "fork_version": "00001020", "network_name": "goerli", "deposit_cli_version": "2.3.0"}]
\ No newline at end of file
diff --git a/watch/Cargo.toml b/watch/Cargo.toml
index d1793a9d06..3dc3b7c190 100644
--- a/watch/Cargo.toml
+++ b/watch/Cargo.toml
@@ -21,7 +21,7 @@ types = { path = "../consensus/types" }
 eth2 = { path = "../common/eth2" }
 beacon_node = { path = "../beacon_node"}
 tokio = { version = "1.14.0", features = ["time"] }
-axum = "0.5.15"
+axum = "0.6.18"
 hyper = "0.14.20"
 serde = "1.0.116"
 serde_json = "1.0.58"
@@ -41,5 +41,8 @@ tokio-postgres = "0.7.5"
 http_api = { path = "../beacon_node/http_api" }
 beacon_chain = { path = "../beacon_node/beacon_chain" }
 network = { path = "../beacon_node/network" }
-testcontainers = "0.14.0"
+# TODO: update to 0.15 when released: https://github.com/testcontainers/testcontainers-rs/issues/497
+testcontainers = { git = "https://github.com/testcontainers/testcontainers-rs/", rev = "0f2c9851" }
 unused_port = { path = "../common/unused_port" }
+task_executor = { path = "../common/task_executor" }
+logging = { path = "../common/logging" }
diff --git a/watch/src/server/mod.rs b/watch/src/server/mod.rs
index 09d5ec6aac..d8ae0eb6c6 100644
--- a/watch/src/server/mod.rs
+++ b/watch/src/server/mod.rs
@@ -5,7 +5,6 @@ use crate::config::Config as FullConfig;
 use crate::database::{self, PgPool};
 use crate::suboptimal_attestations::{attestation_routes, blockprint_attestation_routes};
 use axum::{
-    handler::Handler,
     http::{StatusCode, Uri},
     routing::get,
     Extension, Json, Router,
@@ -104,7 +103,7 @@ pub fn start_server(
     }
 
     let app = routes
-        .fallback(route_not_found.into_service())
+        .fallback(route_not_found)
         .layer(Extension(pool))
         .layer(Extension(slots_per_epoch));
 
diff --git a/watch/tests/tests.rs b/watch/tests/tests.rs
index acdda8c306..dc0b8af6e3 100644
--- a/watch/tests/tests.rs
+++ b/watch/tests/tests.rs
@@ -1,17 +1,27 @@
 #![recursion_limit = "256"]
 #![cfg(unix)]
 
-use beacon_chain::test_utils::{
-    AttestationStrategy, BeaconChainHarness, BlockStrategy, EphemeralHarnessType,
+use beacon_chain::{
+    test_utils::{AttestationStrategy, BeaconChainHarness, BlockStrategy, EphemeralHarnessType},
+    ChainConfig,
 };
 use eth2::{types::BlockId, BeaconNodeHttpClient, SensitiveUrl, Timeouts};
 use http_api::test_utils::{create_api_server, ApiServer};
+use log::error;
+use logging::test_logger;
 use network::NetworkReceivers;
-
 use rand::distributions::Alphanumeric;
 use rand::{thread_rng, Rng};
+use std::collections::HashMap;
+use std::env;
+use std::net::SocketAddr;
+use std::time::Duration;
+use testcontainers::{clients::Cli, core::WaitFor, Image, RunnableImage};
 use tokio::sync::oneshot;
+use tokio::{runtime, task::JoinHandle};
+use tokio_postgres::{config::Config as PostgresConfig, Client, NoTls};
 use types::{Hash256, MainnetEthSpec, Slot};
+use unused_port::unused_tcp4_port;
 use url::Url;
 use watch::{
     client::WatchHttpClient,
@@ -21,14 +31,40 @@ use watch::{
     updater::{handler::*, run_updater, Config as UpdaterConfig, WatchSpec},
 };
 
-use log::error;
-use std::net::SocketAddr;
-use std::time::Duration;
-use tokio::{runtime, task::JoinHandle};
-use tokio_postgres::{config::Config as PostgresConfig, Client, NoTls};
-use unused_port::unused_tcp4_port;
+#[derive(Debug)]
+pub struct Postgres(HashMap<String, String>);
 
-use testcontainers::{clients::Cli, images::postgres::Postgres, RunnableImage};
+impl Default for Postgres {
+    fn default() -> Self {
+        let mut env_vars = HashMap::new();
+        env_vars.insert("POSTGRES_DB".to_owned(), "postgres".to_owned());
+        env_vars.insert("POSTGRES_HOST_AUTH_METHOD".into(), "trust".into());
+
+        Self(env_vars)
+    }
+}
+
+impl Image for Postgres {
+    type Args = ();
+
+    fn name(&self) -> String {
+        "postgres".to_owned()
+    }
+
+    fn tag(&self) -> String {
+        "11-alpine".to_owned()
+    }
+
+    fn ready_conditions(&self) -> Vec<WaitFor> {
+        vec![WaitFor::message_on_stderr(
+            "database system is ready to accept connections",
+        )]
+    }
+
+    fn env_vars(&self) -> Box<dyn Iterator<Item = (&String, &String)> + '_> {
+        Box::new(self.0.iter())
+    }
+}
 
 type E = MainnetEthSpec;
 
@@ -36,6 +72,11 @@ const VALIDATOR_COUNT: usize = 32;
 const SLOTS_PER_EPOCH: u64 = 32;
 const DEFAULT_TIMEOUT: Duration = Duration::from_secs(5);
 
+/// Set this environment variable to use a different hostname for connecting to
+/// the database. Can be set to `host.docker.internal` for docker-in-docker
+/// setups.
+const WATCH_HOST_ENV_VARIABLE: &str = "WATCH_HOST";
+
 fn build_test_config(config: &DatabaseConfig) -> PostgresConfig {
     let mut postgres_config = PostgresConfig::new();
     postgres_config
@@ -71,17 +112,25 @@ pub async fn create_test_database(config: &DatabaseConfig) {
         .expect("Database creation failed");
 }
 
+pub fn get_host_from_env() -> String {
+    env::var(WATCH_HOST_ENV_VARIABLE).unwrap_or_else(|_| "localhost".to_string())
+}
+
 struct TesterBuilder {
     pub harness: BeaconChainHarness<EphemeralHarnessType<E>>,
     pub config: Config,
     _bn_network_rx: NetworkReceivers<E>,
-    _bn_api_shutdown_tx: oneshot::Sender<()>,
 }
 
 impl TesterBuilder {
     pub async fn new() -> TesterBuilder {
         let harness = BeaconChainHarness::builder(E::default())
             .default_spec()
+            .chain_config(ChainConfig {
+                reconstruct_historic_states: true,
+                ..ChainConfig::default()
+            })
+            .logger(test_logger())
             .deterministic_keypairs(VALIDATOR_COUNT)
             .fresh_ephemeral_store()
             .build();
@@ -92,10 +141,14 @@ impl TesterBuilder {
         let ApiServer {
             server,
             listening_socket: bn_api_listening_socket,
-            shutdown_tx: _bn_api_shutdown_tx,
             network_rx: _bn_network_rx,
             ..
-        } = create_api_server(harness.chain.clone(), harness.logger().clone()).await;
+        } = create_api_server(
+            harness.chain.clone(),
+            &harness.runtime,
+            harness.logger().clone(),
+        )
+        .await;
         tokio::spawn(server);
 
         /*
@@ -107,6 +160,7 @@ impl TesterBuilder {
             database: DatabaseConfig {
                 dbname: random_dbname(),
                 port: database_port,
+                host: get_host_from_env(),
                 ..Default::default()
             },
             server: ServerConfig {
@@ -128,7 +182,6 @@ impl TesterBuilder {
             harness,
             config,
             _bn_network_rx,
-            _bn_api_shutdown_tx,
         }
     }
     pub async fn build(self, pool: PgPool) -> Tester {
@@ -175,7 +228,6 @@ impl TesterBuilder {
             config: self.config,
             updater,
             _bn_network_rx: self._bn_network_rx,
-            _bn_api_shutdown_tx: self._bn_api_shutdown_tx,
             _watch_shutdown_tx,
         }
     }
@@ -193,7 +245,6 @@ struct Tester {
     pub config: Config,
     pub updater: UpdateHandler<E>,
     _bn_network_rx: NetworkReceivers<E>,
-    _bn_api_shutdown_tx: oneshot::Sender<()>,
     _watch_shutdown_tx: oneshot::Sender<()>,
 }