diff --git a/.github/workflows/test-suite.yml b/.github/workflows/test-suite.yml
index a7e7792fe4..6761a59ea8 100644
--- a/.github/workflows/test-suite.yml
+++ b/.github/workflows/test-suite.yml
@@ -129,10 +129,6 @@ 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 network tests for all known forks 
       run: make test-network
   slasher-tests:
@@ -333,6 +329,7 @@ jobs:
     - name: Run cargo audit to identify known security vulnerabilities reported to the RustSec Advisory Database
       run:  make audit
 # TODO(sean): re-enable this when we can figure it out with c-kzg
+# Issue: https://github.com/sigp/lighthouse/issues/4440
 #  cargo-vendor:
 #    name: cargo-vendor
 #    runs-on: ubuntu-latest
diff --git a/Cargo.lock b/Cargo.lock
index b1369d21f1..5cfa03a9de 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2251,6 +2251,7 @@ dependencies = [
  "ssz_types",
  "store",
  "tokio",
+ "tree_hash",
  "types",
 ]
 
@@ -5237,6 +5238,7 @@ dependencies = [
  "derivative",
  "environment",
  "error-chain",
+ "eth2",
  "ethereum-types 0.14.1",
  "ethereum_ssz",
  "execution_layer",
diff --git a/beacon_node/beacon_chain/src/beacon_chain.rs b/beacon_node/beacon_chain/src/beacon_chain.rs
index e788ac8154..10a9ce2a4c 100644
--- a/beacon_node/beacon_chain/src/beacon_chain.rs
+++ b/beacon_node/beacon_chain/src/beacon_chain.rs
@@ -118,10 +118,10 @@ use store::{
 use task_executor::{ShutdownReason, TaskExecutor};
 use tokio_stream::Stream;
 use tree_hash::TreeHash;
-use types::beacon_block_body::{from_block_kzg_commitments, to_block_kzg_commitments};
+use types::beacon_block_body::from_block_kzg_commitments;
 use types::beacon_state::CloneConfig;
-use types::blob_sidecar::{BlobItems, BlobSidecarList, FixedBlobSidecarList};
-use types::consts::deneb::MIN_EPOCHS_FOR_BLOB_SIDECARS_REQUESTS;
+use types::blob_sidecar::{BlobSidecarList, FixedBlobSidecarList};
+use types::sidecar::BlobItems;
 use types::*;
 
 pub type ForkChoiceError = fork_choice::Error<crate::ForkChoiceStoreError>;
@@ -186,7 +186,7 @@ pub enum WhenSlotSkipped {
     Prev,
 }
 
-#[derive(Debug, PartialEq)]
+#[derive(Copy, Clone, Debug, PartialEq)]
 pub enum AvailabilityProcessingStatus {
     MissingComponents(Slot, Hash256),
     Imported(Hash256),
@@ -1175,17 +1175,8 @@ impl<T: BeaconChainTypes> BeaconChain<T> {
 
     /// Returns the blobs at the given root, if any.
     ///
-    /// Returns `Ok(None)` if the blobs and associated block are not found.
-    ///
-    /// If we can find the corresponding block in our database, we know whether we *should* have
-    /// blobs. If we should have blobs and no blobs are found, this will error. If we shouldn't,
-    /// this will reconstruct an empty `BlobsSidecar`.
-    ///
     /// ## Errors
-    /// - any database read errors
-    /// - block and blobs are inconsistent in the database
-    /// - this method is called with a pre-deneb block root
-    /// - this method is called for a blob that is beyond the prune depth
+    /// May return a database error.
     pub fn get_blobs(&self, block_root: &Hash256) -> Result<BlobSidecarList<T::EthSpec>, Error> {
         match self.store.get_blobs(block_root)? {
             Some(blobs) => Ok(blobs),
@@ -2017,7 +2008,14 @@ impl<T: BeaconChainTypes> BeaconChain<T> {
         blob_sidecar: SignedBlobSidecar<T::EthSpec>,
         subnet_id: u64,
     ) -> Result<GossipVerifiedBlob<T>, GossipBlobError<T::EthSpec>> {
-        blob_verification::validate_blob_sidecar_for_gossip(blob_sidecar, subnet_id, self)
+        metrics::inc_counter(&metrics::BLOBS_SIDECAR_PROCESSING_REQUESTS);
+        let _timer = metrics::start_timer(&metrics::BLOBS_SIDECAR_GOSSIP_VERIFICATION_TIMES);
+        blob_verification::validate_blob_sidecar_for_gossip(blob_sidecar, subnet_id, self).map(
+            |v| {
+                metrics::inc_counter(&metrics::BLOBS_SIDECAR_PROCESSING_SUCCESSES);
+                v
+            },
+        )
     }
 
     /// Accepts some 'LightClientOptimisticUpdate' from the network and attempts to verify it
@@ -2798,9 +2796,6 @@ impl<T: BeaconChainTypes> BeaconChain<T> {
     /// Returns `Ok(block_root)` if the given `unverified_block` was successfully verified and
     /// imported into the chain.
     ///
-    /// For post deneb blocks, this returns a `BlockError::AvailabilityPending` error
-    /// if the corresponding blobs are not in the required caches.
-    ///
     /// Items that implement `IntoExecutionPendingBlock` include:
     ///
     /// - `SignedBeaconBlock`
@@ -2824,26 +2819,80 @@ impl<T: BeaconChainTypes> BeaconChain<T> {
         // Increment the Prometheus counter for block processing requests.
         metrics::inc_counter(&metrics::BLOCK_PROCESSING_REQUESTS);
 
+        let block_slot = unverified_block.block().slot();
+
+        // A small closure to group the verification and import errors.
         let chain = self.clone();
+        let import_block = async move {
+            let execution_pending = unverified_block.into_execution_pending_block(
+                block_root,
+                &chain,
+                notify_execution_layer,
+            )?;
+            publish_fn()?;
+            let executed_block = chain.into_executed_block(execution_pending).await?;
+            match executed_block {
+                ExecutedBlock::Available(block) => {
+                    self.import_available_block(Box::new(block)).await
+                }
+                ExecutedBlock::AvailabilityPending(block) => {
+                    self.check_block_availability_and_import(block).await
+                }
+            }
+        };
 
-        let execution_pending = unverified_block.into_execution_pending_block(
-            block_root,
-            &chain,
-            notify_execution_layer,
-        )?;
+        // Verify and import the block.
+        match import_block.await {
+            // The block was successfully verified and imported. Yay.
+            Ok(status @ AvailabilityProcessingStatus::Imported(block_root)) => {
+                trace!(
+                    self.log,
+                    "Beacon block imported";
+                    "block_root" => ?block_root,
+                    "block_slot" => block_slot,
+                );
 
-        publish_fn()?;
+                // Increment the Prometheus counter for block processing successes.
+                metrics::inc_counter(&metrics::BLOCK_PROCESSING_SUCCESSES);
 
-        let executed_block = self
-            .clone()
-            .into_executed_block(execution_pending)
-            .await
-            .map_err(|e| self.handle_block_error(e))?;
+                Ok(status)
+            }
+            Ok(status @ AvailabilityProcessingStatus::MissingComponents(slot, block_root)) => {
+                trace!(
+                    self.log,
+                    "Beacon block awaiting blobs";
+                    "block_root" => ?block_root,
+                    "block_slot" => slot,
+                );
 
-        match executed_block {
-            ExecutedBlock::Available(block) => self.import_available_block(Box::new(block)).await,
-            ExecutedBlock::AvailabilityPending(block) => {
-                self.check_block_availability_and_import(block).await
+                Ok(status)
+            }
+            Err(e @ BlockError::BeaconChainError(BeaconChainError::TokioJoin(_))) => {
+                debug!(
+                    self.log,
+                    "Beacon block processing cancelled";
+                    "error" => ?e,
+                );
+                Err(e)
+            }
+            // There was an error whilst attempting to verify and import the block. The block might
+            // be partially verified or partially imported.
+            Err(BlockError::BeaconChainError(e)) => {
+                crit!(
+                    self.log,
+                    "Beacon block processing error";
+                    "error" => ?e,
+                );
+                Err(BlockError::BeaconChainError(e))
+            }
+            // The block failed verification.
+            Err(other) => {
+                debug!(
+                    self.log,
+                    "Beacon block rejected";
+                    "reason" => other.to_string(),
+                );
+                Err(other)
             }
         }
     }
@@ -2903,35 +2952,6 @@ impl<T: BeaconChainTypes> BeaconChain<T> {
         ))
     }
 
-    fn handle_block_error(&self, e: BlockError<T::EthSpec>) -> BlockError<T::EthSpec> {
-        match e {
-            e @ BlockError::BeaconChainError(BeaconChainError::TokioJoin(_)) => {
-                debug!(
-                    self.log,
-                    "Beacon block processing cancelled";
-                    "error" => ?e,
-                );
-                e
-            }
-            BlockError::BeaconChainError(e) => {
-                crit!(
-                    self.log,
-                    "Beacon block processing error";
-                    "error" => ?e,
-                );
-                BlockError::BeaconChainError(e)
-            }
-            other => {
-                trace!(
-                    self.log,
-                    "Beacon block rejected";
-                    "reason" => other.to_string(),
-                );
-                other
-            }
-        }
-    }
-
     /* Import methods */
 
     /// Checks if the block is available, and imports immediately if so, otherwise caches the block
@@ -3017,11 +3037,9 @@ impl<T: BeaconChainTypes> BeaconChain<T> {
             consensus_context,
         } = import_data;
 
-        let slot = block.slot();
-
         // import
         let chain = self.clone();
-        let result = self
+        let block_root = self
             .spawn_blocking_handle(
                 move || {
                     chain.import_block(
@@ -3037,29 +3055,8 @@ impl<T: BeaconChainTypes> BeaconChain<T> {
                 },
                 "payload_verification_handle",
             )
-            .await
-            .map_err(|e| {
-                let b = BlockError::from(e);
-                self.handle_block_error(b)
-            })?;
-
-        match result {
-            // The block was successfully verified and imported. Yay.
-            Ok(block_root) => {
-                trace!(
-                    self.log,
-                    "Beacon block imported";
-                    "block_root" => ?block_root,
-                     "block_slot" => slot,
-                );
-
-                // Increment the Prometheus counter for block processing successes.
-                metrics::inc_counter(&metrics::BLOCK_PROCESSING_SUCCESSES);
-
-                Ok(AvailabilityProcessingStatus::Imported(block_root))
-            }
-            Err(e) => Err(self.handle_block_error(e)),
-        }
+            .await??;
+        Ok(AvailabilityProcessingStatus::Imported(block_root))
     }
 
     /// Accepts a fully-verified and available block and imports it into the chain without performing any
@@ -3248,7 +3245,7 @@ impl<T: BeaconChainTypes> BeaconChain<T> {
 
         if let Some(blobs) = blobs {
             if !blobs.is_empty() {
-                info!(
+                debug!(
                     self.log, "Writing blobs to store";
                     "block_root" => %block_root,
                     "count" => blobs.len(),
@@ -4111,10 +4108,10 @@ impl<T: BeaconChainTypes> BeaconChain<T> {
         let proposal_epoch = proposal_slot.epoch(T::EthSpec::slots_per_epoch());
 
         let head_block_root = cached_head.head_block_root();
-        let parent_block_root = cached_head.parent_block_root();
+        let parent_beacon_block_root = cached_head.parent_block_root();
 
         // The proposer head must be equal to the canonical head or its parent.
-        if proposer_head != head_block_root && proposer_head != parent_block_root {
+        if proposer_head != head_block_root && proposer_head != parent_beacon_block_root {
             warn!(
                 self.log,
                 "Unable to compute payload attributes";
@@ -4193,7 +4190,7 @@ impl<T: BeaconChainTypes> BeaconChain<T> {
 
         // Get the `prev_randao` and parent block number.
         let head_block_number = cached_head.head_block_number()?;
-        let (prev_randao, parent_block_number) = if proposer_head == parent_block_root {
+        let (prev_randao, parent_block_number) = if proposer_head == parent_beacon_block_root {
             (
                 cached_head.parent_random()?,
                 head_block_number.saturating_sub(1),
@@ -4206,7 +4203,7 @@ impl<T: BeaconChainTypes> BeaconChain<T> {
             proposer_index,
             prev_randao,
             parent_block_number,
-            parent_beacon_block_root: parent_block_root,
+            parent_beacon_block_root,
         }))
     }
 
@@ -4926,7 +4923,6 @@ impl<T: BeaconChainTypes> BeaconChain<T> {
                                 .map_err(|_| BlockProductionError::InvalidPayloadFork)?,
                             bls_to_execution_changes: bls_to_execution_changes.into(),
                             blob_kzg_commitments: kzg_commitments
-                                .map(to_block_kzg_commitments::<T::EthSpec>)
                                 .ok_or(BlockProductionError::InvalidPayloadFork)?,
                         },
                     }),
@@ -6283,31 +6279,7 @@ impl<T: BeaconChainTypes> BeaconChain<T> {
     /// The epoch at which we require a data availability check in block processing.
     /// `None` if the `Deneb` fork is disabled.
     pub fn data_availability_boundary(&self) -> Option<Epoch> {
-        self.spec.deneb_fork_epoch.and_then(|fork_epoch| {
-            self.epoch().ok().map(|current_epoch| {
-                std::cmp::max(
-                    fork_epoch,
-                    current_epoch.saturating_sub(*MIN_EPOCHS_FOR_BLOB_SIDECARS_REQUESTS),
-                )
-            })
-        })
-    }
-
-    /// Returns true if the given epoch lies within the da boundary and false otherwise.
-    pub fn block_needs_da_check(&self, block_epoch: Epoch) -> bool {
-        self.data_availability_boundary()
-            .map_or(false, |da_epoch| block_epoch >= da_epoch)
-    }
-
-    /// Returns `true` if we are at or past the `Deneb` fork. This will always return `false` if
-    /// the `Deneb` fork is disabled.
-    pub fn is_data_availability_check_required(&self) -> Result<bool, Error> {
-        let current_epoch = self.epoch()?;
-        Ok(self
-            .spec
-            .deneb_fork_epoch
-            .map(|fork_epoch| fork_epoch <= current_epoch)
-            .unwrap_or(false))
+        self.data_availability_checker.data_availability_boundary()
     }
 }
 
diff --git a/beacon_node/beacon_chain/src/blob_verification.rs b/beacon_node/beacon_chain/src/blob_verification.rs
index 7c71e77ff7..70c2cec951 100644
--- a/beacon_node/beacon_chain/src/blob_verification.rs
+++ b/beacon_node/beacon_chain/src/blob_verification.rs
@@ -18,7 +18,7 @@ use std::borrow::Cow;
 use types::blob_sidecar::BlobIdentifier;
 use types::{
     BeaconState, BeaconStateError, BlobSidecar, BlobSidecarList, ChainSpec, CloneConfig, EthSpec,
-    Hash256, KzgCommitment, RelativeEpoch, SignedBlobSidecar, Slot,
+    Hash256, RelativeEpoch, SignedBlobSidecar, Slot,
 };
 
 /// An error occurred while validating a gossip blob.
@@ -172,6 +172,9 @@ impl<T: BeaconChainTypes> GossipVerifiedBlob<T> {
     pub fn slot(&self) -> Slot {
         self.blob.message.slot
     }
+    pub fn proposer_index(&self) -> u64 {
+        self.blob.message.proposer_index
+    }
 }
 
 pub fn validate_blob_sidecar_for_gossip<T: BeaconChainTypes>(
@@ -497,9 +500,6 @@ impl<T: EthSpec> KzgVerifiedBlob<T> {
     pub fn clone_blob(&self) -> Arc<BlobSidecar<T>> {
         self.blob.clone()
     }
-    pub fn kzg_commitment(&self) -> KzgCommitment {
-        self.blob.kzg_commitment
-    }
     pub fn block_root(&self) -> Hash256 {
         self.blob.block_root
     }
diff --git a/beacon_node/beacon_chain/src/block_verification_types.rs b/beacon_node/beacon_chain/src/block_verification_types.rs
index 0e56de7472..587fd2d1c5 100644
--- a/beacon_node/beacon_chain/src/block_verification_types.rs
+++ b/beacon_node/beacon_chain/src/block_verification_types.rs
@@ -162,6 +162,13 @@ impl<E: EthSpec> ExecutedBlock<E> {
             Self::AvailabilityPending(pending) => &pending.block,
         }
     }
+
+    pub fn block_root(&self) -> Hash256 {
+        match self {
+            ExecutedBlock::AvailabilityPending(pending) => pending.import_data.block_root,
+            ExecutedBlock::Available(available) => available.import_data.block_root,
+        }
+    }
 }
 
 /// A block that has completed all pre-deneb block processing checks including verification
diff --git a/beacon_node/beacon_chain/src/builder.rs b/beacon_node/beacon_chain/src/builder.rs
index 45c4f42411..1bdcc78a38 100644
--- a/beacon_node/beacon_chain/src/builder.rs
+++ b/beacon_node/beacon_chain/src/builder.rs
@@ -883,7 +883,6 @@ where
             slasher: self.slasher.clone(),
             validator_monitor: RwLock::new(validator_monitor),
             genesis_backfill_slot,
-            //TODO(sean) should we move kzg solely to the da checker?
             data_availability_checker: Arc::new(
                 DataAvailabilityChecker::new(slot_clock, kzg.clone(), store, self.spec)
                     .map_err(|e| format!("Error initializing DataAvailabiltyChecker: {:?}", e))?,
diff --git a/beacon_node/beacon_chain/src/data_availability_checker.rs b/beacon_node/beacon_chain/src/data_availability_checker.rs
index 353b26e036..8488b98ffe 100644
--- a/beacon_node/beacon_chain/src/data_availability_checker.rs
+++ b/beacon_node/beacon_chain/src/data_availability_checker.rs
@@ -24,9 +24,9 @@ use types::{BlobSidecarList, ChainSpec, Epoch, EthSpec, Hash256, SignedBeaconBlo
 mod overflow_lru_cache;
 
 /// The LRU Cache stores `PendingComponents` which can store up to
-/// `MAX_BLOBS_PER_BLOCK = 4` blobs each. A `BlobSidecar` is 0.131256 MB. So
-/// the maximum size of a `PendingComponents` is ~ 0.525024 MB. Setting this
-/// to 1024 means the maximum size of the cache is ~ 0.5 GB. But the cache
+/// `MAX_BLOBS_PER_BLOCK = 6` blobs each. A `BlobSidecar` is 0.131256 MB. So
+/// the maximum size of a `PendingComponents` is ~ 0.787536 MB. Setting this
+/// to 1024 means the maximum size of the cache is ~ 0.8 GB. But the cache
 /// will target a size of less than 75% of capacity.
 pub const OVERFLOW_LRU_CAPACITY: usize = 1024;
 
@@ -79,11 +79,10 @@ impl From<ssz::DecodeError> for AvailabilityCheckError {
     }
 }
 
-/// This cache contains
-///  - blobs that have been gossip verified
-///  - commitments for blocks that have been gossip verified, but the commitments themselves
-///    have not been verified against blobs
-///  - blocks that have been fully verified and only require a data availability check
+/// This includes a cache for any blocks or blobs that have been received over gossip or RPC
+/// and are awaiting more components before they can be imported. Additionally the
+/// `DataAvailabilityChecker` is responsible for KZG verification of block components as well as
+/// checking whether a "availability check" is required at all.
 pub struct DataAvailabilityChecker<T: BeaconChainTypes> {
     availability_cache: Arc<OverflowLRUCache<T>>,
     slot_clock: T::SlotClock,
@@ -112,18 +111,6 @@ impl<T: EthSpec> Debug for Availability<T> {
     }
 }
 
-impl<T: EthSpec> Availability<T> {
-    /// Returns all the blob identifiers associated with an  `AvailableBlock`.
-    /// Returns `None` if avaiability hasn't been fully satisfied yet.
-    pub fn get_available_blob_ids(&self) -> Option<Vec<BlobIdentifier>> {
-        if let Self::Available(block) = self {
-            Some(block.get_all_blob_ids())
-        } else {
-            None
-        }
-    }
-}
-
 impl<T: BeaconChainTypes> DataAvailabilityChecker<T> {
     pub fn new(
         slot_clock: T::SlotClock,
@@ -140,10 +127,13 @@ impl<T: BeaconChainTypes> DataAvailabilityChecker<T> {
         })
     }
 
+    /// Checks if the given block root is cached.
     pub fn has_block(&self, block_root: &Hash256) -> bool {
         self.availability_cache.has_block(block_root)
     }
 
+    /// Checks which blob ids are still required for a given block root, taking any cached
+    /// components into consideration.
     pub fn get_missing_blob_ids_checking_cache(
         &self,
         block_root: Hash256,
@@ -164,7 +154,7 @@ impl<T: BeaconChainTypes> DataAvailabilityChecker<T> {
     ) -> Option<Vec<BlobIdentifier>> {
         let epoch = self.slot_clock.now()?.epoch(T::EthSpec::slots_per_epoch());
 
-        self.da_check_required(epoch).then(|| {
+        self.da_check_required_for_epoch(epoch).then(|| {
             block_opt
                 .map(|block| {
                     block.get_filtered_blob_ids(Some(block_root), |i, _| {
@@ -194,6 +184,8 @@ impl<T: BeaconChainTypes> DataAvailabilityChecker<T> {
         self.availability_cache.peek_blob(blob_id)
     }
 
+    /// Put a list of blobs received via RPC into the availability cache. This performs KZG
+    /// verification on the blobs in the list.
     pub fn put_rpc_blobs(
         &self,
         block_root: Hash256,
@@ -232,8 +224,8 @@ impl<T: BeaconChainTypes> DataAvailabilityChecker<T> {
             .put_kzg_verified_blobs(kzg_verified_blob.block_root(), &[kzg_verified_blob])
     }
 
-    /// Check if we have all the blobs for a block. If we do, return the Availability variant that
-    /// triggers import of the block.
+    /// Check if we have all the blobs for a block. Returns `Availability` which has information
+    /// about whether all components have been received or more are required.
     pub fn put_pending_executed_block(
         &self,
         executed_block: AvailabilityPendingExecutedBlock<T::EthSpec>,
@@ -282,7 +274,7 @@ impl<T: BeaconChainTypes> DataAvailabilityChecker<T> {
     /// Determines the blob requirements for a block. Answers the question: "Does this block require
     /// blobs?".
     fn blobs_required_for_block(&self, block: &SignedBeaconBlock<T::EthSpec>) -> bool {
-        let block_within_da_period = self.da_check_required(block.epoch());
+        let block_within_da_period = self.da_check_required_for_epoch(block.epoch());
         let block_has_kzg_commitments = block
             .message()
             .body()
@@ -308,7 +300,7 @@ impl<T: BeaconChainTypes> DataAvailabilityChecker<T> {
     }
 
     /// Returns true if the given epoch lies within the da boundary and false otherwise.
-    pub fn da_check_required(&self, block_epoch: Epoch) -> bool {
+    pub fn da_check_required_for_epoch(&self, block_epoch: Epoch) -> bool {
         self.data_availability_boundary()
             .map_or(false, |da_epoch| block_epoch >= da_epoch)
     }
diff --git a/beacon_node/beacon_chain/src/errors.rs b/beacon_node/beacon_chain/src/errors.rs
index 8b4493d49d..683ec68c28 100644
--- a/beacon_node/beacon_chain/src/errors.rs
+++ b/beacon_node/beacon_chain/src/errors.rs
@@ -270,11 +270,6 @@ pub enum BlockProductionError {
     BlockingFailed(execution_layer::Error),
     TerminalPoWBlockLookupFailed(execution_layer::Error),
     GetPayloadFailed(execution_layer::Error),
-    GetBlobsFailed(execution_layer::Error),
-    BlobPayloadMismatch {
-        blob_block_hash: ExecutionBlockHash,
-        payload_block_hash: ExecutionBlockHash,
-    },
     FailedToReadFinalizedBlock(store::Error),
     MissingFinalizedBlock(Hash256),
     BlockTooLarge(usize),
@@ -283,8 +278,7 @@ pub enum BlockProductionError {
     MissingSyncAggregate,
     MissingExecutionPayload,
     MissingKzgCommitment(String),
-    MissingKzgProof(String),
-    TokioJoin(tokio::task::JoinError),
+    TokioJoin(JoinError),
     BeaconChain(BeaconChainError),
     InvalidPayloadFork,
     TrustedSetupNotInitialized,
diff --git a/beacon_node/beacon_chain/src/historical_blocks.rs b/beacon_node/beacon_chain/src/historical_blocks.rs
index 736a2b4f63..98aaf7015b 100644
--- a/beacon_node/beacon_chain/src/historical_blocks.rs
+++ b/beacon_node/beacon_chain/src/historical_blocks.rs
@@ -89,10 +89,10 @@ impl<T: BeaconChainTypes> BeaconChain<T> {
             return Ok(0);
         }
 
-        let n_blobs_to_import = blocks_to_import
+        let n_blobs_lists_to_import = blocks_to_import
             .iter()
-            .map(|available_block| available_block.blobs().map_or(0, |blobs| blobs.len()))
-            .sum::<usize>();
+            .filter(|available_block| available_block.blobs().is_some())
+            .count();
 
         let mut expected_block_root = anchor_info.oldest_block_parent;
         let mut prev_block_slot = anchor_info.oldest_block_slot;
@@ -100,7 +100,7 @@ impl<T: BeaconChainTypes> BeaconChain<T> {
             ChunkWriter::<BlockRoots, _, _>::new(&self.store.cold_db, prev_block_slot.as_usize())?;
 
         let mut cold_batch = Vec::with_capacity(blocks_to_import.len());
-        let mut hot_batch = Vec::with_capacity(blocks_to_import.len() + n_blobs_to_import);
+        let mut hot_batch = Vec::with_capacity(blocks_to_import.len() + n_blobs_lists_to_import);
         let mut signed_blocks = Vec::with_capacity(blocks_to_import.len());
 
         for available_block in blocks_to_import.into_iter().rev() {
diff --git a/beacon_node/beacon_chain/src/state_advance_timer.rs b/beacon_node/beacon_chain/src/state_advance_timer.rs
index 3d21a14c83..f73223fa54 100644
--- a/beacon_node/beacon_chain/src/state_advance_timer.rs
+++ b/beacon_node/beacon_chain/src/state_advance_timer.rs
@@ -186,7 +186,7 @@ async fn state_advance_timer<T: BeaconChainTypes>(
                             head_slot,
                         }) => debug!(
                             log,
-                            "Refused to advance head state. Chain may be syncing or lagging too far behind";
+                            "Refused to advance head state";
                             "head_slot" => head_slot,
                             "current_slot" => current_slot,
                         ),
diff --git a/beacon_node/beacon_processor/src/lib.rs b/beacon_node/beacon_processor/src/lib.rs
index 87a3ec3b58..7b993f3cba 100644
--- a/beacon_node/beacon_processor/src/lib.rs
+++ b/beacon_node/beacon_processor/src/lib.rs
@@ -60,6 +60,7 @@ use std::time::Duration;
 use task_executor::TaskExecutor;
 use tokio::sync::mpsc;
 use tokio::sync::mpsc::error::TrySendError;
+use types::consts::deneb::MAX_BLOBS_PER_BLOCK;
 use types::{Attestation, Hash256, SignedAggregateAndProof, SubnetId};
 use types::{EthSpec, Slot};
 use work_reprocessing_queue::IgnoredRpcBlock;
@@ -148,7 +149,10 @@ const MAX_SYNC_CONTRIBUTION_QUEUE_LEN: usize = 1024;
 /// The maximum number of queued `SignedBeaconBlock` objects received from the network RPC that
 /// will be stored before we start dropping them.
 const MAX_RPC_BLOCK_QUEUE_LEN: usize = 1_024;
-const MAX_RPC_BLOB_QUEUE_LEN: usize = 1_024 * 4;
+
+/// The maximum number of queued `BlobSidecar` objects received from the network RPC that
+/// will be stored before we start dropping them.
+const MAX_RPC_BLOB_QUEUE_LEN: usize = 1_024;
 
 /// The maximum number of queued `Vec<SignedBeaconBlock>` objects received during syncing that will
 /// be stored before we start dropping them.
@@ -162,13 +166,18 @@ const MAX_STATUS_QUEUE_LEN: usize = 1_024;
 /// will be stored before we start dropping them.
 const MAX_BLOCKS_BY_RANGE_QUEUE_LEN: usize = 1_024;
 
-const MAX_BLOBS_BY_RANGE_QUEUE_LEN: usize = 1_024;
+/// The maximum number of queued `BlobsByRangeRequest` objects received from the network RPC that
+/// will be stored before we start dropping them.
+const MAX_BLOBS_BY_RANGE_QUEUE_LEN: usize =
+    MAX_BLOCKS_BY_RANGE_QUEUE_LEN * MAX_BLOBS_PER_BLOCK as usize;
 
 /// The maximum number of queued `BlocksByRootRequest` objects received from the network RPC that
 /// will be stored before we start dropping them.
 const MAX_BLOCKS_BY_ROOTS_QUEUE_LEN: usize = 1_024;
 
-const MAX_BLOCK_AND_BLOBS_BY_ROOTS_QUEUE_LEN: usize = 1_024;
+/// The maximum number of queued `BlobsByRootRequest` objects received from the network RPC that
+/// will be stored before we start dropping them.
+const MAX_BLOBS_BY_ROOTS_QUEUE_LEN: usize = 1_024;
 
 /// Maximum number of `SignedBlsToExecutionChange` messages to queue before dropping them.
 ///
@@ -808,7 +817,7 @@ impl<E: EthSpec> BeaconProcessor<E> {
         let mut status_queue = FifoQueue::new(MAX_STATUS_QUEUE_LEN);
         let mut bbrange_queue = FifoQueue::new(MAX_BLOCKS_BY_RANGE_QUEUE_LEN);
         let mut bbroots_queue = FifoQueue::new(MAX_BLOCKS_BY_ROOTS_QUEUE_LEN);
-        let mut blbroots_queue = FifoQueue::new(MAX_BLOCK_AND_BLOBS_BY_ROOTS_QUEUE_LEN);
+        let mut blbroots_queue = FifoQueue::new(MAX_BLOBS_BY_ROOTS_QUEUE_LEN);
         let mut blbrange_queue = FifoQueue::new(MAX_BLOBS_BY_RANGE_QUEUE_LEN);
 
         let mut gossip_bls_to_execution_change_queue =
@@ -1294,6 +1303,10 @@ impl<E: EthSpec> BeaconProcessor<E> {
                     &metrics::BEACON_PROCESSOR_GOSSIP_BLOCK_QUEUE_TOTAL,
                     gossip_block_queue.len() as i64,
                 );
+                metrics::set_gauge(
+                    &metrics::BEACON_PROCESSOR_GOSSIP_BLOB_QUEUE_TOTAL,
+                    gossip_block_queue.len() as i64,
+                );
                 metrics::set_gauge(
                     &metrics::BEACON_PROCESSOR_RPC_BLOCK_QUEUE_TOTAL,
                     rpc_block_queue.len() as i64,
diff --git a/beacon_node/builder_client/src/lib.rs b/beacon_node/builder_client/src/lib.rs
index aebc3f5e2b..28cd1fe486 100644
--- a/beacon_node/builder_client/src/lib.rs
+++ b/beacon_node/builder_client/src/lib.rs
@@ -1,5 +1,5 @@
 use eth2::types::builder_bid::SignedBuilderBid;
-use eth2::types::payload::FullPayloadContents;
+use eth2::types::FullPayloadContents;
 use eth2::types::{
     BlindedPayload, EthSpec, ExecutionBlockHash, ForkVersionedResponse, PublicKeyBytes,
     SignedBlockContents, SignedValidatorRegistrationData, Slot,
diff --git a/beacon_node/client/src/config.rs b/beacon_node/client/src/config.rs
index a5d36e9436..72c918a289 100644
--- a/beacon_node/client/src/config.rs
+++ b/beacon_node/client/src/config.rs
@@ -51,11 +51,6 @@ pub struct Config {
     /// Path where the freezer database will be located.
     pub freezer_db_path: Option<PathBuf>,
     /// Path where the blobs database will be located if blobs should be in a separate database.
-    ///
-    /// The capacity this location should hold varies with the data availability boundary. It
-    /// should be able to store < 69 GB when [MIN_EPOCHS_FOR_BLOB_SIDECARS_REQUESTS](types::consts::deneb::MIN_EPOCHS_FOR_BLOB_SIDECARS_REQUESTS) is 4096
-    /// epochs of 32 slots (up to 131072 bytes data per blob and up to 4 blobs per block, 88 bytes
-    /// of [BlobsSidecar](types::BlobsSidecar) metadata per block).
     pub blobs_db_path: Option<PathBuf>,
     pub log_file: PathBuf,
     /// If true, the node will use co-ordinated junk for eth1 values.
diff --git a/beacon_node/execution_layer/src/block_hash.rs b/beacon_node/execution_layer/src/block_hash.rs
index 007fbfd76b..5ba61beafc 100644
--- a/beacon_node/execution_layer/src/block_hash.rs
+++ b/beacon_node/execution_layer/src/block_hash.rs
@@ -7,8 +7,8 @@ use ethers_core::utils::rlp::RlpStream;
 use keccak_hash::KECCAK_EMPTY_LIST_RLP;
 use triehash::ordered_trie_root;
 use types::{
-    map_execution_block_header_fields_except_withdrawals, Address, BeaconBlockRef, EthSpec,
-    ExecutionBlockHash, ExecutionBlockHeader, ExecutionPayloadRef, Hash256, Hash64, Uint256,
+    map_execution_block_header_fields_base, Address, BeaconBlockRef, EthSpec, ExecutionBlockHash,
+    ExecutionBlockHeader, ExecutionPayloadRef, Hash256, Hash64, Uint256,
 };
 
 impl<T: EthSpec> ExecutionLayer<T> {
@@ -104,7 +104,7 @@ pub fn rlp_encode_withdrawal(withdrawal: &JsonWithdrawal) -> Vec<u8> {
 pub fn rlp_encode_block_header(header: &ExecutionBlockHeader) -> Vec<u8> {
     let mut rlp_header_stream = RlpStream::new();
     rlp_header_stream.begin_unbounded_list();
-    map_execution_block_header_fields_except_withdrawals!(&header, |_, field| {
+    map_execution_block_header_fields_base!(&header, |_, field| {
         rlp_header_stream.append(field);
     });
     if let Some(withdrawals_root) = &header.withdrawals_root {
diff --git a/beacon_node/execution_layer/src/engine_api.rs b/beacon_node/execution_layer/src/engine_api.rs
index 8952b15ed0..5fd0610b37 100644
--- a/beacon_node/execution_layer/src/engine_api.rs
+++ b/beacon_node/execution_layer/src/engine_api.rs
@@ -5,18 +5,19 @@ use crate::http::{
     ENGINE_GET_PAYLOAD_V1, ENGINE_GET_PAYLOAD_V2, ENGINE_GET_PAYLOAD_V3, ENGINE_NEW_PAYLOAD_V1,
     ENGINE_NEW_PAYLOAD_V2, ENGINE_NEW_PAYLOAD_V3,
 };
-use crate::BlobTxConversionError;
 use eth2::types::{
-    SsePayloadAttributes, SsePayloadAttributesV1, SsePayloadAttributesV2, SsePayloadAttributesV3,
+    BlobsBundle, SsePayloadAttributes, SsePayloadAttributesV1, SsePayloadAttributesV2,
+    SsePayloadAttributesV3,
 };
 use ethers_core::types::Transaction;
-use ethers_core::utils::rlp::{self, Decodable, Rlp};
+use ethers_core::utils::rlp;
+use ethers_core::utils::rlp::{Decodable, Rlp};
 use http::deposit_methods::RpcError;
 pub use json_structures::{JsonWithdrawal, TransitionConfigurationV1};
 use pretty_reqwest_error::PrettyReqwestError;
 use reqwest::StatusCode;
 use serde::{Deserialize, Serialize};
-use state_processing::per_block_processing::deneb::deneb::kzg_commitment_to_versioned_hash;
+use state_processing::per_block_processing::deneb::kzg_commitment_to_versioned_hash;
 use std::convert::TryFrom;
 use strum::IntoStaticStr;
 use superstruct::superstruct;
@@ -26,8 +27,8 @@ pub use types::{
     Withdrawal, Withdrawals,
 };
 use types::{
-    BeaconStateError, BlobsBundle, ExecutionPayloadCapella, ExecutionPayloadDeneb,
-    ExecutionPayloadMerge, KzgProofs, VersionedHash,
+    BeaconStateError, ExecutionPayloadCapella, ExecutionPayloadDeneb, ExecutionPayloadMerge,
+    KzgProofs, VersionedHash,
 };
 
 pub mod auth;
@@ -63,7 +64,6 @@ pub enum Error {
     RequiredMethodUnsupported(&'static str),
     UnsupportedForkVariant(String),
     RlpDecoderError(rlp::DecoderError),
-    BlobTxConversionError(BlobTxConversionError),
 }
 
 impl From<reqwest::Error> for Error {
@@ -109,12 +109,6 @@ impl From<ssz_types::Error> for Error {
     }
 }
 
-impl From<BlobTxConversionError> for Error {
-    fn from(e: BlobTxConversionError) -> Self {
-        Error::BlobTxConversionError(e)
-    }
-}
-
 #[derive(Clone, Copy, Debug, PartialEq, IntoStaticStr)]
 #[strum(serialize_all = "snake_case")]
 pub enum PayloadStatusV1Status {
@@ -223,7 +217,8 @@ impl<T: EthSpec> TryFrom<ExecutionPayload<T>> for ExecutionBlockWithTransactions
                     .transactions
                     .iter()
                     .map(|tx| Transaction::decode(&Rlp::new(tx)))
-                    .collect::<Result<Vec<_>, _>>()?,
+                    .collect::<Result<Vec<_>, _>>()
+                    .unwrap_or_else(|_| Vec::new()),
             }),
             ExecutionPayload::Capella(block) => {
                 Self::Capella(ExecutionBlockWithTransactionsCapella {
@@ -244,7 +239,8 @@ impl<T: EthSpec> TryFrom<ExecutionPayload<T>> for ExecutionBlockWithTransactions
                         .transactions
                         .iter()
                         .map(|tx| Transaction::decode(&Rlp::new(tx)))
-                        .collect::<Result<Vec<_>, _>>()?,
+                        .collect::<Result<Vec<_>, _>>()
+                        .unwrap_or_else(|_| Vec::new()),
                     withdrawals: Vec::from(block.withdrawals)
                         .into_iter()
                         .map(|withdrawal| withdrawal.into())
@@ -269,7 +265,8 @@ impl<T: EthSpec> TryFrom<ExecutionPayload<T>> for ExecutionBlockWithTransactions
                     .transactions
                     .iter()
                     .map(|tx| Transaction::decode(&Rlp::new(tx)))
-                    .collect::<Result<Vec<_>, _>>()?,
+                    .collect::<Result<Vec<_>, _>>()
+                    .unwrap_or_else(|_| Vec::new()),
                 withdrawals: Vec::from(block.withdrawals)
                     .into_iter()
                     .map(|withdrawal| withdrawal.into())
diff --git a/beacon_node/execution_layer/src/engine_api/http.rs b/beacon_node/execution_layer/src/engine_api/http.rs
index 3eb79d3163..c680617108 100644
--- a/beacon_node/execution_layer/src/engine_api/http.rs
+++ b/beacon_node/execution_layer/src/engine_api/http.rs
@@ -67,6 +67,7 @@ pub static LIGHTHOUSE_CAPABILITIES: &[&str] = &[
     ENGINE_GET_PAYLOAD_V3,
     ENGINE_FORKCHOICE_UPDATED_V1,
     ENGINE_FORKCHOICE_UPDATED_V2,
+    ENGINE_FORKCHOICE_UPDATED_V3,
     ENGINE_GET_PAYLOAD_BODIES_BY_HASH_V1,
     ENGINE_GET_PAYLOAD_BODIES_BY_RANGE_V1,
 ];
@@ -74,7 +75,6 @@ pub static LIGHTHOUSE_CAPABILITIES: &[&str] = &[
 /// This is necessary because a user might run a capella-enabled version of
 /// lighthouse before they update to a capella-enabled execution engine.
 // TODO (mark): rip this out once we are post-capella on mainnet
-// TODO (sean): do we similarly need something like this for 4844?
 pub static PRE_CAPELLA_ENGINE_CAPABILITIES: EngineCapabilities = EngineCapabilities {
     new_payload_v1: true,
     new_payload_v2: false,
diff --git a/beacon_node/execution_layer/src/engine_api/json_structures.rs b/beacon_node/execution_layer/src/engine_api/json_structures.rs
index 3f4f1eb96b..f35cc7dc57 100644
--- a/beacon_node/execution_layer/src/engine_api/json_structures.rs
+++ b/beacon_node/execution_layer/src/engine_api/json_structures.rs
@@ -2,12 +2,11 @@ use super::*;
 use serde::{Deserialize, Serialize};
 use strum::EnumString;
 use superstruct::superstruct;
-use types::beacon_block_body::KzgCommitments;
+use types::beacon_block_body::BuilderKzgCommitments;
 use types::blob_sidecar::BlobsList;
 use types::{
-    BlobsBundle, EthSpec, ExecutionBlockHash, ExecutionPayload, ExecutionPayloadCapella,
-    ExecutionPayloadDeneb, ExecutionPayloadMerge, FixedVector, Transactions, Unsigned,
-    VariableList, Withdrawal,
+    EthSpec, ExecutionBlockHash, ExecutionPayload, ExecutionPayloadCapella, ExecutionPayloadDeneb,
+    ExecutionPayloadMerge, FixedVector, Transactions, Unsigned, VariableList, Withdrawal,
 };
 
 #[derive(Debug, PartialEq, Serialize, Deserialize)]
@@ -439,7 +438,7 @@ impl From<JsonPayloadAttributes> for PayloadAttributes {
 #[derive(Debug, PartialEq, Serialize, Deserialize)]
 #[serde(bound = "E: EthSpec", rename_all = "camelCase")]
 pub struct JsonBlobsBundleV1<E: EthSpec> {
-    pub commitments: KzgCommitments<E>,
+    pub commitments: BuilderKzgCommitments<E>,
     pub proofs: KzgProofs<E>,
     #[serde(with = "ssz_types::serde_utils::list_of_hex_fixed_vec")]
     pub blobs: BlobsList<E>,
diff --git a/beacon_node/execution_layer/src/lib.rs b/beacon_node/execution_layer/src/lib.rs
index 9850bd2d0c..a6c9465e16 100644
--- a/beacon_node/execution_layer/src/lib.rs
+++ b/beacon_node/execution_layer/src/lib.rs
@@ -15,7 +15,6 @@ use engines::{Engine, EngineError};
 pub use engines::{EngineState, ForkchoiceState};
 use eth2::types::{builder_bid::SignedBuilderBid, BlobsBundle, ForkVersionedResponse};
 use eth2::types::{FullPayloadContents, SignedBlockContents};
-use ethers_core::abi::ethereum_types::FromStrRadixErr;
 use ethers_core::types::Transaction as EthersTransaction;
 use fork_choice::ForkchoiceUpdateParameters;
 use lru::LruCache;
@@ -40,14 +39,14 @@ use tokio::{
 };
 use tokio_stream::wrappers::WatchStream;
 use tree_hash::TreeHash;
-use types::beacon_block_body::KzgCommitments;
-use types::blob_sidecar::BlobItems;
+use types::beacon_block_body::{to_block_kzg_commitments, BlockBodyKzgCommitments};
 use types::builder_bid::BuilderBid;
+use types::sidecar::{BlobItems, Sidecar};
+use types::KzgProofs;
 use types::{
     AbstractExecPayload, BeaconStateError, BlindedPayload, BlockType, ChainSpec, Epoch,
     ExecPayload, ExecutionPayloadCapella, ExecutionPayloadDeneb, ExecutionPayloadMerge,
 };
-use types::{KzgProofs, Sidecar};
 use types::{ProposerPreparationData, PublicKeyBytes, Signature, Slot, Transaction};
 
 mod block_hash;
@@ -111,7 +110,9 @@ impl<E: EthSpec, Payload: AbstractExecPayload<E>> TryFrom<BuilderBid<E>>
                     .try_into()
                     .map_err(|_| Error::InvalidPayloadConversion)?,
                 block_value: builder_bid.value,
-                kzg_commitments: builder_bid.blinded_blobs_bundle.commitments,
+                kzg_commitments: to_block_kzg_commitments::<E>(
+                    builder_bid.blinded_blobs_bundle.commitments,
+                ),
                 blobs: BlobItems::try_from_blob_roots(builder_bid.blinded_blobs_bundle.blob_roots)
                     .map_err(Error::InvalidBlobConversion)?,
                 proofs: builder_bid.blinded_blobs_bundle.proofs,
@@ -167,7 +168,7 @@ pub enum BlockProposalContents<T: EthSpec, Payload: AbstractExecPayload<T>> {
     PayloadAndBlobs {
         payload: Payload,
         block_value: Uint256,
-        kzg_commitments: KzgCommitments<T>,
+        kzg_commitments: BlockBodyKzgCommitments<T>,
         blobs: <Payload::Sidecar as Sidecar<T>>::BlobItems,
         proofs: KzgProofs<T>,
     },
@@ -184,7 +185,7 @@ impl<E: EthSpec, Payload: AbstractExecPayload<E>> TryFrom<GetPayloadResponse<E>>
             Some(bundle) => Ok(Self::PayloadAndBlobs {
                 payload: execution_payload.into(),
                 block_value,
-                kzg_commitments: bundle.commitments,
+                kzg_commitments: to_block_kzg_commitments::<E>(bundle.commitments),
                 blobs: BlobItems::try_from_blobs(bundle.blobs)
                     .map_err(Error::InvalidBlobConversion)?,
                 proofs: bundle.proofs,
@@ -203,7 +204,7 @@ impl<T: EthSpec, Payload: AbstractExecPayload<T>> BlockProposalContents<T, Paylo
         self,
     ) -> (
         Payload,
-        Option<KzgCommitments<T>>,
+        Option<BlockBodyKzgCommitments<T>>,
         Option<<Payload::Sidecar as Sidecar<T>>::BlobItems>,
         Option<KzgProofs<T>>,
     ) {
@@ -1792,10 +1793,10 @@ impl<T: EthSpec> ExecutionLayer<T> {
             VariableList::new(
                 transactions
                     .into_iter()
-                    .map(ethers_tx_to_ssz::<T>)
-                    .collect::<Result<Vec<_>, BlobTxConversionError>>()?,
+                    .map(|tx| VariableList::new(tx.rlp().to_vec()))
+                    .collect::<Result<Vec<_>, ssz_types::Error>>()?,
             )
-            .map_err(BlobTxConversionError::SszError)
+            .map_err(ApiError::SszError)
         };
 
         let payload = match block {
@@ -2142,81 +2143,12 @@ fn timestamp_now() -> u64 {
         .as_secs()
 }
 
-#[derive(Debug)]
-pub enum BlobTxConversionError {
-    /// The transaction type was not set.
-    NoTransactionType,
-    /// The transaction chain ID was not set.
-    NoChainId,
-    /// The transaction nonce was too large to fit in a `u64`.
-    NonceTooLarge,
-    /// The transaction gas was too large to fit in a `u64`.
-    GasTooHigh,
-    /// Missing the `max_fee_per_gas` field.
-    MaxFeePerGasMissing,
-    /// Missing the `max_priority_fee_per_gas` field.
-    MaxPriorityFeePerGasMissing,
-    /// Missing the `access_list` field.
-    AccessListMissing,
-    /// Missing the `max_fee_per_data_gas` field.
-    MaxFeePerDataGasMissing,
-    /// Missing the `versioned_hashes` field.
-    VersionedHashesMissing,
-    /// `y_parity` field was greater than one.
-    InvalidYParity,
-    /// There was an error converting the transaction to SSZ.
-    SszError(ssz_types::Error),
-    /// There was an error converting the transaction from JSON.
-    SerdeJson(serde_json::Error),
-    /// There was an error converting the transaction from hex.
-    FromHex(String),
-    /// There was an error converting the transaction from hex.
-    FromStrRadix(FromStrRadixErr),
-    /// A `versioned_hash` did not contain 32 bytes.
-    InvalidVersionedHashBytesLen,
-}
-
-impl From<ssz_types::Error> for BlobTxConversionError {
-    fn from(value: ssz_types::Error) -> Self {
-        Self::SszError(value)
-    }
-}
-
-impl From<serde_json::Error> for BlobTxConversionError {
-    fn from(value: serde_json::Error) -> Self {
-        Self::SerdeJson(value)
-    }
-}
-
-fn random_valid_tx<T: EthSpec>(
-) -> Result<Transaction<T::MaxBytesPerTransaction>, BlobTxConversionError> {
-    // Calculate transaction bytes. We don't care about the contents of the transaction.
-    let transaction: EthersTransaction = serde_json::from_str(
-        r#"{
-            "blockHash":"0x1d59ff54b1eb26b013ce3cb5fc9dab3705b415a67127a003c3e61eb445bb8df2",
-            "blockNumber":"0x5daf3b",
-            "from":"0xa7d9ddbe1f17865597fbd27ec712455208b6b76d",
-            "gas":"0xc350",
-            "gasPrice":"0x4a817c800",
-            "hash":"0x88df016429689c079f3b2f6ad39fa052532c56795b733da78a91ebe6a713944b",
-            "input":"0x68656c6c6f21",
-            "nonce":"0x15",
-            "to":"0xf02c1c8e6114b1dbe8937a39260b5b0a374432bb",
-            "transactionIndex":"0x41",
-            "value":"0xf3dbb76162000",
-            "v":"0x25",
-            "r":"0x1b5e176d927f8e9ab405058b2d2457392da3e20f328b16ddabcebc33eaac5fea",
-            "s":"0x4ba69724e8f69de52f0125ad8b3c5c2cef33019bac3249e2c0a2192766d1721c"
-         }"#,
-    )
-    .unwrap();
-    ethers_tx_to_ssz::<T>(transaction)
-}
-
-fn ethers_tx_to_ssz<T: EthSpec>(
-    tx: EthersTransaction,
-) -> Result<Transaction<T::MaxBytesPerTransaction>, BlobTxConversionError> {
-    VariableList::new(tx.rlp().to_vec()).map_err(Into::into)
+fn static_valid_tx<T: EthSpec>() -> Result<Transaction<T::MaxBytesPerTransaction>, String> {
+    // This is a real transaction hex encoded, but we don't care about the contents of the transaction.
+    let bytes = hex::decode(
+        "b87502f872041a8459682f008459682f0d8252089461815774383099e24810ab832a5b2a5425c154d58829a2241af62c000080c001a059e6b67f48fb32e7e570dfb11e042b5ad2e55e3ce3ce9cd989c7e06e07feeafda0016b83f4f980694ed2eee4d10667242b1f40dc406901b34125b008d334d47469"
+    ).map_err(|e| format!("Failed to decode transaction bytes: {:?}", e))?;
+    VariableList::new(bytes).map_err(|e| format!("Failed to convert transaction to SSZ: {:?}", e))
 }
 
 fn noop<T: EthSpec>(
diff --git a/beacon_node/execution_layer/src/test_utils/execution_block_generator.rs b/beacon_node/execution_layer/src/test_utils/execution_block_generator.rs
index af9bc266aa..444f935331 100644
--- a/beacon_node/execution_layer/src/test_utils/execution_block_generator.rs
+++ b/beacon_node/execution_layer/src/test_utils/execution_block_generator.rs
@@ -6,8 +6,9 @@ use crate::{
         },
         ExecutionBlock, PayloadAttributes, PayloadId, PayloadStatusV1, PayloadStatusV1Status,
     },
-    random_valid_tx, ExecutionBlockWithTransactions,
+    static_valid_tx, ExecutionBlockWithTransactions,
 };
+use eth2::types::BlobsBundle;
 use kzg::Kzg;
 use rand::thread_rng;
 use serde::{Deserialize, Serialize};
@@ -16,9 +17,9 @@ use std::sync::Arc;
 use tree_hash::TreeHash;
 use tree_hash_derive::TreeHash;
 use types::{
-    BlobSidecar, BlobsBundle, ChainSpec, EthSpec, ExecutionBlockHash, ExecutionPayload,
-    ExecutionPayloadCapella, ExecutionPayloadDeneb, ExecutionPayloadHeader, ExecutionPayloadMerge,
-    ForkName, Hash256, Transactions, Uint256,
+    BlobSidecar, ChainSpec, EthSpec, ExecutionBlockHash, ExecutionPayload, ExecutionPayloadCapella,
+    ExecutionPayloadDeneb, ExecutionPayloadHeader, ExecutionPayloadMerge, ForkName, Hash256,
+    Transactions, Uint256,
 };
 
 use super::DEFAULT_TERMINAL_BLOCK;
@@ -643,7 +644,7 @@ pub fn generate_random_blobs<T: EthSpec>(
             ..
         } = random_valid_sidecar;
 
-        let tx = random_valid_tx::<T>()
+        let tx = static_valid_tx::<T>()
             .map_err(|e| format!("error creating valid tx SSZ bytes: {:?}", e))?;
 
         transactions.push(tx);
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 4c62e84abe..ee6854799e 100644
--- a/beacon_node/execution_layer/src/test_utils/mock_builder.rs
+++ b/beacon_node/execution_layer/src/test_utils/mock_builder.rs
@@ -1,7 +1,7 @@
 use crate::test_utils::{DEFAULT_BUILDER_PAYLOAD_VALUE_WEI, DEFAULT_JWT_SECRET};
 use crate::{Config, ExecutionLayer, PayloadAttributes};
 use async_trait::async_trait;
-use eth2::types::{BlockId, StateId, ValidatorId};
+use eth2::types::{BlobsBundle, BlockId, StateId, ValidatorId};
 use eth2::{BeaconNodeHttpClient, Timeouts};
 pub use ethereum_consensus::state_transition::Context;
 use ethereum_consensus::{
@@ -38,7 +38,7 @@ use tempfile::NamedTempFile;
 use tree_hash::TreeHash;
 use types::builder_bid::BlindedBlobsBundle;
 use types::{
-    Address, BeaconState, BlobsBundle, ChainSpec, EthSpec, ExecPayload, ExecutionPayload,
+    Address, BeaconState, ChainSpec, EthSpec, ExecPayload, ExecutionPayload,
     ExecutionPayloadHeader, ForkName, Hash256, Slot, Uint256,
 };
 
diff --git a/beacon_node/http_api/src/metrics.rs b/beacon_node/http_api/src/metrics.rs
index 32a4150365..26ee183c83 100644
--- a/beacon_node/http_api/src/metrics.rs
+++ b/beacon_node/http_api/src/metrics.rs
@@ -42,16 +42,4 @@ lazy_static::lazy_static! {
         "http_api_block_published_very_late_total",
         "The count of times a block was published beyond the attestation deadline"
     );
-    pub static ref HTTP_API_BLOB_BROADCAST_DELAY_TIMES: Result<Histogram> = try_create_histogram(
-        "http_api_blob_broadcast_delay_times",
-        "Time between start of the slot and when the blob was broadcast"
-    );
-    pub static ref HTTP_API_BLOB_PUBLISHED_LATE_TOTAL: Result<IntCounter> = try_create_int_counter(
-        "http_api_blob_published_late_total",
-        "The count of times a blob was published beyond more than half way to the attestation deadline"
-    );
-    pub static ref HTTP_API_BLOB_PUBLISHED_VERY_LATE_TOTAL: Result<IntCounter> = try_create_int_counter(
-        "http_api_blob_published_very_late_total",
-        "The count of times a blob was published beyond the attestation deadline"
-    );
 }
diff --git a/beacon_node/http_api/src/publish_blocks.rs b/beacon_node/http_api/src/publish_blocks.rs
index 3fe1f37c97..f8babd8f32 100644
--- a/beacon_node/http_api/src/publish_blocks.rs
+++ b/beacon_node/http_api/src/publish_blocks.rs
@@ -227,12 +227,16 @@ pub async fn publish_block<T: BeaconChainTypes, B: IntoGossipVerifiedBlockConten
         }
         Ok(AvailabilityProcessingStatus::MissingComponents(_, block_root)) => {
             let msg = format!("Missing parts of block with root {:?}", block_root);
-            error!(
-                log,
-                "Invalid block provided to HTTP API";
-                "reason" => &msg
-            );
-            Err(warp_utils::reject::broadcast_without_import(msg))
+            if let BroadcastValidation::Gossip = validation_level {
+                Err(warp_utils::reject::broadcast_without_import(msg))
+            } else {
+                error!(
+                    log,
+                    "Invalid block provided to HTTP API";
+                    "reason" => &msg
+                );
+                Err(warp_utils::reject::broadcast_without_import(msg))
+            }
         }
         Err(BlockError::BeaconChainError(BeaconChainError::UnableToPublish)) => {
             Err(warp_utils::reject::custom_server_error(
diff --git a/beacon_node/http_api/tests/status_tests.rs b/beacon_node/http_api/tests/status_tests.rs
index b3d1e9daa8..d37026d406 100644
--- a/beacon_node/http_api/tests/status_tests.rs
+++ b/beacon_node/http_api/tests/status_tests.rs
@@ -13,12 +13,7 @@ type E = MinimalEthSpec;
 /// Create a new test environment that is post-merge with `chain_depth` blocks.
 async fn post_merge_tester(chain_depth: u64, validator_count: u64) -> InteractiveTester<E> {
     // Test using latest fork so that we simulate conditions as similar to mainnet as possible.
-    // TODO(jimmy): We should change this back to `latest()`. These tests currently fail on Deneb because:
-    // 1. KZG library doesn't support Minimal spec, changing to Mainnet spec fixes some tests; BUT
-    // 2. `harness.process_block_result` in the test below panics due to
-    //    `AvailabilityProcessingStatus::PendingBlobs`, and there seems to be some race
-    //    condition going on, because the test passes if I step through the code in debug.
-    let mut spec = ForkName::Capella.make_genesis_spec(E::default_spec());
+    let mut spec = ForkName::latest().make_genesis_spec(E::default_spec());
     spec.terminal_total_difficulty = 1.into();
 
     let tester = InteractiveTester::<E>::new(Some(spec), validator_count as usize).await;
@@ -108,7 +103,7 @@ async fn el_error_on_new_payload() {
     let (block_contents, _) = harness
         .make_block(pre_state, Slot::new(num_blocks + 1))
         .await;
-    let block = block_contents.0;
+    let (block, blobs) = block_contents;
     let block_hash = block
         .message()
         .body()
@@ -124,7 +119,9 @@ async fn el_error_on_new_payload() {
     // Attempt to process the block, which should error.
     harness.advance_slot();
     assert!(matches!(
-        harness.process_block_result((block.clone(), None)).await,
+        harness
+            .process_block_result((block.clone(), blobs.clone()))
+            .await,
         Err(BlockError::ExecutionPayloadError(_))
     ));
 
@@ -143,7 +140,7 @@ async fn el_error_on_new_payload() {
             validation_error: None,
         },
     );
-    harness.process_block_result((block, None)).await.unwrap();
+    harness.process_block_result((block, blobs)).await.unwrap();
 
     let api_response = tester.client.get_node_syncing().await.unwrap().data;
     assert_eq!(api_response.el_offline, Some(false));
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 fddf5ab842..7a4efb7389 100644
--- a/beacon_node/lighthouse_network/src/rpc/codec/ssz_snappy.rs
+++ b/beacon_node/lighthouse_network/src/rpc/codec/ssz_snappy.rs
@@ -73,7 +73,7 @@ impl<TSpec: EthSpec> Encoder<RPCCodedResponse<TSpec>> for SSZSnappyInboundCodec<
                 RPCResponse::BlocksByRange(res) => res.as_ssz_bytes(),
                 RPCResponse::BlocksByRoot(res) => res.as_ssz_bytes(),
                 RPCResponse::BlobsByRange(res) => res.as_ssz_bytes(),
-                RPCResponse::SidecarByRoot(res) => res.as_ssz_bytes(),
+                RPCResponse::BlobsByRoot(res) => res.as_ssz_bytes(),
                 RPCResponse::LightClientBootstrap(res) => res.as_ssz_bytes(),
                 RPCResponse::Pong(res) => res.data.as_ssz_bytes(),
                 RPCResponse::MetaData(res) =>
@@ -421,7 +421,7 @@ fn context_bytes<T: EthSpec>(
                     SignedBeaconBlock::Base { .. } => Some(fork_context.genesis_context_bytes()),
                 };
             }
-            if let RPCResponse::BlobsByRange(_) | RPCResponse::SidecarByRoot(_) = rpc_variant {
+            if let RPCResponse::BlobsByRange(_) | RPCResponse::BlobsByRoot(_) = rpc_variant {
                 return fork_context.to_context_bytes(ForkName::Deneb);
             }
         }
@@ -563,7 +563,7 @@ fn handle_rpc_response<T: EthSpec>(
             )),
         },
         SupportedProtocol::BlobsByRootV1 => match fork_name {
-            Some(ForkName::Deneb) => Ok(Some(RPCResponse::SidecarByRoot(Arc::new(
+            Some(ForkName::Deneb) => Ok(Some(RPCResponse::BlobsByRoot(Arc::new(
                 BlobSidecar::from_ssz_bytes(decoded_buffer)?,
             )))),
             Some(_) => Err(RPCError::ErrorResponse(
@@ -1058,11 +1058,11 @@ mod tests {
         assert_eq!(
             encode_then_decode_response(
                 SupportedProtocol::BlobsByRootV1,
-                RPCCodedResponse::Success(RPCResponse::SidecarByRoot(default_blob_sidecar())),
+                RPCCodedResponse::Success(RPCResponse::BlobsByRoot(default_blob_sidecar())),
                 ForkName::Deneb,
                 &chain_spec
             ),
-            Ok(Some(RPCResponse::SidecarByRoot(default_blob_sidecar()))),
+            Ok(Some(RPCResponse::BlobsByRoot(default_blob_sidecar()))),
         );
     }
 
diff --git a/beacon_node/lighthouse_network/src/rpc/methods.rs b/beacon_node/lighthouse_network/src/rpc/methods.rs
index 70fb94a66c..2148ece569 100644
--- a/beacon_node/lighthouse_network/src/rpc/methods.rs
+++ b/beacon_node/lighthouse_network/src/rpc/methods.rs
@@ -15,6 +15,7 @@ use std::sync::Arc;
 use strum::IntoStaticStr;
 use superstruct::superstruct;
 use types::blob_sidecar::BlobIdentifier;
+use types::consts::deneb::MAX_BLOBS_PER_BLOCK;
 use types::{
     blob_sidecar::BlobSidecar, light_client_bootstrap::LightClientBootstrap, Epoch, EthSpec,
     Hash256, SignedBeaconBlock, Slot,
@@ -31,12 +32,8 @@ pub const MAX_ERROR_LEN: u64 = 256;
 pub type MaxRequestBlocksDeneb = U128;
 pub const MAX_REQUEST_BLOCKS_DENEB: u64 = 128;
 
-// TODO: this is calculated as MAX_REQUEST_BLOCKS_DENEB * MAX_BLOBS_PER_BLOCK and
-// MAX_BLOBS_PER_BLOCK comes from the spec.
-// MAX_REQUEST_BLOCKS_DENEB = 128
-// MAX_BLOBS_PER_BLOCK = 6
 pub type MaxRequestBlobSidecars = U768;
-pub const MAX_REQUEST_BLOB_SIDECARS: u64 = 768;
+pub const MAX_REQUEST_BLOB_SIDECARS: u64 = MAX_REQUEST_BLOCKS_DENEB * MAX_BLOBS_PER_BLOCK;
 
 /// Wrapper over SSZ List to represent error message in rpc responses.
 #[derive(Debug, Clone)]
@@ -390,7 +387,7 @@ pub enum RPCResponse<T: EthSpec> {
     LightClientBootstrap(LightClientBootstrap<T>),
 
     /// A response to a get BLOBS_BY_ROOT request.
-    SidecarByRoot(Arc<BlobSidecar<T>>),
+    BlobsByRoot(Arc<BlobSidecar<T>>),
 
     /// A PONG response to a PING request.
     Pong(Ping),
@@ -483,7 +480,7 @@ impl<T: EthSpec> RPCCodedResponse<T> {
                 RPCResponse::BlocksByRange(_) => true,
                 RPCResponse::BlocksByRoot(_) => true,
                 RPCResponse::BlobsByRange(_) => true,
-                RPCResponse::SidecarByRoot(_) => true,
+                RPCResponse::BlobsByRoot(_) => true,
                 RPCResponse::Pong(_) => false,
                 RPCResponse::MetaData(_) => false,
                 RPCResponse::LightClientBootstrap(_) => false,
@@ -521,7 +518,7 @@ impl<T: EthSpec> RPCResponse<T> {
             RPCResponse::BlocksByRange(_) => Protocol::BlocksByRange,
             RPCResponse::BlocksByRoot(_) => Protocol::BlocksByRoot,
             RPCResponse::BlobsByRange(_) => Protocol::BlobsByRange,
-            RPCResponse::SidecarByRoot(_) => Protocol::BlobsByRoot,
+            RPCResponse::BlobsByRoot(_) => Protocol::BlobsByRoot,
             RPCResponse::Pong(_) => Protocol::Ping,
             RPCResponse::MetaData(_) => Protocol::MetaData,
             RPCResponse::LightClientBootstrap(_) => Protocol::LightClientBootstrap,
@@ -562,7 +559,7 @@ impl<T: EthSpec> std::fmt::Display for RPCResponse<T> {
             RPCResponse::BlobsByRange(blob) => {
                 write!(f, "BlobsByRange: Blob slot: {}", blob.slot)
             }
-            RPCResponse::SidecarByRoot(sidecar) => {
+            RPCResponse::BlobsByRoot(sidecar) => {
                 write!(f, "BlobsByRoot: Blob slot: {}", sidecar.slot)
             }
             RPCResponse::Pong(ping) => write!(f, "Pong: {}", ping.data),
diff --git a/beacon_node/lighthouse_network/src/rpc/protocol.rs b/beacon_node/lighthouse_network/src/rpc/protocol.rs
index c22a2d8b7a..cdc7e4d74d 100644
--- a/beacon_node/lighthouse_network/src/rpc/protocol.rs
+++ b/beacon_node/lighthouse_network/src/rpc/protocol.rs
@@ -277,8 +277,8 @@ impl SupportedProtocol {
         }
     }
 
-    fn currently_supported() -> Vec<ProtocolId> {
-        vec![
+    fn currently_supported(fork_context: &ForkContext) -> Vec<ProtocolId> {
+        let mut supported = vec![
             ProtocolId::new(Self::StatusV1, Encoding::SSZSnappy),
             ProtocolId::new(Self::GoodbyeV1, Encoding::SSZSnappy),
             // V2 variants have higher preference then V1
@@ -286,12 +286,17 @@ impl SupportedProtocol {
             ProtocolId::new(Self::BlocksByRangeV1, Encoding::SSZSnappy),
             ProtocolId::new(Self::BlocksByRootV2, Encoding::SSZSnappy),
             ProtocolId::new(Self::BlocksByRootV1, Encoding::SSZSnappy),
-            ProtocolId::new(Self::BlobsByRangeV1, Encoding::SSZSnappy),
-            ProtocolId::new(Self::BlobsByRootV1, Encoding::SSZSnappy),
             ProtocolId::new(Self::PingV1, Encoding::SSZSnappy),
             ProtocolId::new(Self::MetaDataV2, Encoding::SSZSnappy),
             ProtocolId::new(Self::MetaDataV1, Encoding::SSZSnappy),
-        ]
+        ];
+        if fork_context.fork_exists(ForkName::Deneb) {
+            supported.extend_from_slice(&[
+                ProtocolId::new(SupportedProtocol::BlobsByRootV1, Encoding::SSZSnappy),
+                ProtocolId::new(SupportedProtocol::BlobsByRangeV1, Encoding::SSZSnappy),
+            ]);
+        }
+        supported
     }
 }
 
@@ -319,14 +324,7 @@ impl<TSpec: EthSpec> UpgradeInfo for RPCProtocol<TSpec> {
 
     /// The list of supported RPC protocols for Lighthouse.
     fn protocol_info(&self) -> Self::InfoIter {
-        let mut supported_protocols = SupportedProtocol::currently_supported();
-
-        if let ForkName::Deneb = self.fork_context.current_fork() {
-            supported_protocols.extend_from_slice(&[
-                ProtocolId::new(SupportedProtocol::BlobsByRootV1, Encoding::SSZSnappy),
-                ProtocolId::new(SupportedProtocol::BlobsByRangeV1, Encoding::SSZSnappy),
-            ]);
-        }
+        let mut supported_protocols = SupportedProtocol::currently_supported(&self.fork_context);
         if self.enable_light_client_server {
             supported_protocols.push(ProtocolId::new(
                 SupportedProtocol::LightClientBootstrapV1,
diff --git a/beacon_node/lighthouse_network/src/service/api_types.rs b/beacon_node/lighthouse_network/src/service/api_types.rs
index b75dcc2a08..6ede0666a3 100644
--- a/beacon_node/lighthouse_network/src/service/api_types.rs
+++ b/beacon_node/lighthouse_network/src/service/api_types.rs
@@ -91,10 +91,10 @@ pub enum Response<TSpec: EthSpec> {
     BlobsByRange(Option<Arc<BlobSidecar<TSpec>>>),
     /// A response to a get BLOCKS_BY_ROOT request.
     BlocksByRoot(Option<Arc<SignedBeaconBlock<TSpec>>>),
-    /// A response to a LightClientUpdate request.
-    LightClientBootstrap(LightClientBootstrap<TSpec>),
     /// A response to a get BLOBS_BY_ROOT request.
     BlobsByRoot(Option<Arc<BlobSidecar<TSpec>>>),
+    /// A response to a LightClientUpdate request.
+    LightClientBootstrap(LightClientBootstrap<TSpec>),
 }
 
 impl<TSpec: EthSpec> std::convert::From<Response<TSpec>> for RPCCodedResponse<TSpec> {
@@ -109,7 +109,7 @@ impl<TSpec: EthSpec> std::convert::From<Response<TSpec>> for RPCCodedResponse<TS
                 None => RPCCodedResponse::StreamTermination(ResponseTermination::BlocksByRange),
             },
             Response::BlobsByRoot(r) => match r {
-                Some(b) => RPCCodedResponse::Success(RPCResponse::SidecarByRoot(b)),
+                Some(b) => RPCCodedResponse::Success(RPCResponse::BlobsByRoot(b)),
                 None => RPCCodedResponse::StreamTermination(ResponseTermination::BlobsByRoot),
             },
             Response::BlobsByRange(r) => match r {
diff --git a/beacon_node/lighthouse_network/src/service/mod.rs b/beacon_node/lighthouse_network/src/service/mod.rs
index ee03cc88a6..a97e09acd0 100644
--- a/beacon_node/lighthouse_network/src/service/mod.rs
+++ b/beacon_node/lighthouse_network/src/service/mod.rs
@@ -1356,7 +1356,7 @@ impl<AppReqId: ReqId, TSpec: EthSpec> Network<AppReqId, TSpec> {
                     RPCResponse::BlocksByRoot(resp) => {
                         self.build_response(id, peer_id, Response::BlocksByRoot(Some(resp)))
                     }
-                    RPCResponse::SidecarByRoot(resp) => {
+                    RPCResponse::BlobsByRoot(resp) => {
                         self.build_response(id, peer_id, Response::BlobsByRoot(Some(resp)))
                     }
                     // Should never be reached
diff --git a/beacon_node/network/Cargo.toml b/beacon_node/network/Cargo.toml
index 7e1dcca495..92ebbbea6f 100644
--- a/beacon_node/network/Cargo.toml
+++ b/beacon_node/network/Cargo.toml
@@ -11,6 +11,7 @@ matches = "0.1.8"
 exit-future = "0.2.0"
 slog-term = "2.6.0"
 slog-async = "2.5.0"
+eth2 = {path="../../common/eth2"}
 
 [dependencies]
 beacon_chain =  { path = "../beacon_chain" }
diff --git a/beacon_node/network/src/metrics.rs b/beacon_node/network/src/metrics.rs
index 73b98e210f..ee0d5e6234 100644
--- a/beacon_node/network/src/metrics.rs
+++ b/beacon_node/network/src/metrics.rs
@@ -71,10 +71,6 @@ lazy_static! {
         "beacon_processor_gossip_blob_verified_total",
         "Total number of gossip blob verified for propagation."
     );
-    pub static ref BEACON_PROCESSOR_GOSSIP_BLOB_IMPORTED_TOTAL: Result<IntCounter> = try_create_int_counter(
-        "beacon_processor_gossip_blob_imported_total",
-        "Total number of gossip blobs imported to fork choice, etc."
-    );
     // Gossip Exits.
     pub static ref BEACON_PROCESSOR_EXIT_VERIFIED_TOTAL: Result<IntCounter> = try_create_int_counter(
         "beacon_processor_exit_verified_total",
@@ -120,10 +116,6 @@ lazy_static! {
         "beacon_processor_rpc_block_imported_total",
         "Total number of gossip blocks imported to fork choice, etc."
     );
-    pub static ref BEACON_PROCESSOR_RPC_BLOB_IMPORTED_TOTAL: Result<IntCounter> = try_create_int_counter(
-        "beacon_processor_rpc_blob_imported_total",
-        "Total number of gossip blobs imported."
-    );
     // Chain segments.
     pub static ref BEACON_PROCESSOR_CHAIN_SEGMENT_SUCCESS_TOTAL: Result<IntCounter> = try_create_int_counter(
         "beacon_processor_chain_segment_success_total",
diff --git a/beacon_node/network/src/network_beacon_processor/gossip_methods.rs b/beacon_node/network/src/network_beacon_processor/gossip_methods.rs
index 4b2a11a567..2821498856 100644
--- a/beacon_node/network/src/network_beacon_processor/gossip_methods.rs
+++ b/beacon_node/network/src/network_beacon_processor/gossip_methods.rs
@@ -621,6 +621,20 @@ impl<T: BeaconChainTypes> NetworkBeaconProcessor<T> {
             .verify_blob_sidecar_for_gossip(signed_blob, blob_index)
         {
             Ok(gossip_verified_blob) => {
+                metrics::inc_counter(&metrics::BEACON_PROCESSOR_GOSSIP_BLOB_VERIFIED_TOTAL);
+
+                if delay >= self.chain.slot_clock.unagg_attestation_production_delay() {
+                    metrics::inc_counter(&metrics::BEACON_BLOB_GOSSIP_ARRIVED_LATE_TOTAL);
+                    debug!(
+                        self.log,
+                        "Gossip blob arrived late";
+                        "block_root" => ?gossip_verified_blob.block_root(),
+                        "proposer_index" => gossip_verified_blob.proposer_index(),
+                        "slot" => gossip_verified_blob.slot(),
+                        "delay" => ?delay,
+                    );
+                }
+
                 debug!(
                     self.log,
                     "Successfully verified gossip blob";
@@ -628,8 +642,20 @@ impl<T: BeaconChainTypes> NetworkBeaconProcessor<T> {
                             "root" => %root,
                             "index" => %index
                 );
-                metrics::inc_counter(&metrics::BEACON_PROCESSOR_GOSSIP_BLOB_VERIFIED_TOTAL);
+
                 self.propagate_validation_result(message_id, peer_id, MessageAcceptance::Accept);
+
+                // Log metrics to keep track of propagation delay times.
+                if let Some(duration) = SystemTime::now()
+                    .duration_since(UNIX_EPOCH)
+                    .ok()
+                    .and_then(|now| now.checked_sub(seen_duration))
+                {
+                    metrics::observe_duration(
+                        &metrics::BEACON_BLOB_GOSSIP_PROPAGATION_VERIFICATION_DELAY_TIME,
+                        duration,
+                    );
+                }
                 self.process_gossip_verified_blob(peer_id, gossip_verified_blob, seen_duration)
                     .await
             }
diff --git a/beacon_node/network/src/network_beacon_processor/rpc_methods.rs b/beacon_node/network/src/network_beacon_processor/rpc_methods.rs
index d70db92499..222b9c8fd4 100644
--- a/beacon_node/network/src/network_beacon_processor/rpc_methods.rs
+++ b/beacon_node/network/src/network_beacon_processor/rpc_methods.rs
@@ -18,7 +18,9 @@ use std::sync::Arc;
 use task_executor::TaskExecutor;
 use tokio_stream::StreamExt;
 use types::blob_sidecar::BlobIdentifier;
-use types::{light_client_bootstrap::LightClientBootstrap, Epoch, EthSpec, Hash256, Slot};
+use types::{
+    light_client_bootstrap::LightClientBootstrap, Epoch, EthSpec, ForkName, Hash256, Slot,
+};
 
 impl<T: BeaconChainTypes> NetworkBeaconProcessor<T> {
     /* Auxiliary functions */
@@ -376,13 +378,19 @@ impl<T: BeaconChainTypes> NetworkBeaconProcessor<T> {
         );
 
         // Should not send more than max request blocks
-        // TODO: We should switch the limit to `MAX_REQUEST_BLOCKS` at the fork,
-        // or maybe consider switching the max value given the fork context.
-        if *req.count() > MAX_REQUEST_BLOCKS_DENEB {
+        let max_request_size = self.chain.epoch().map_or(MAX_REQUEST_BLOCKS, |epoch| {
+            match self.chain.spec.fork_name_at_epoch(epoch) {
+                ForkName::Deneb => MAX_REQUEST_BLOCKS_DENEB,
+                ForkName::Base | ForkName::Altair | ForkName::Merge | ForkName::Capella => {
+                    MAX_REQUEST_BLOCKS
+                }
+            }
+        });
+        if *req.count() > max_request_size {
             return self.send_error_response(
                 peer_id,
                 RPCResponseErrorCode::InvalidRequest,
-                "Request exceeded `MAX_REQUEST_BLOCKS_DENEB`".into(),
+                format!("Request exceeded max size {max_request_size}"),
                 request_id,
             );
         }
@@ -425,17 +433,7 @@ impl<T: BeaconChainTypes> NetworkBeaconProcessor<T> {
         };
 
         // Pick out the required blocks, ignoring skip-slots.
-        let mut last_block_root = req
-            .start_slot()
-            .checked_sub(1)
-            .map(|prev_slot| {
-                self.chain
-                    .block_root_at_slot(Slot::new(prev_slot), WhenSlotSkipped::Prev)
-            })
-            .transpose()
-            .ok()
-            .flatten()
-            .flatten();
+        let mut last_block_root = None;
         let maybe_block_roots = process_results(forwards_block_root_iter, |iter| {
             iter.take_while(|(_, slot)| {
                 slot.as_u64() < req.start_slot().saturating_add(*req.count())
@@ -714,17 +712,12 @@ impl<T: BeaconChainTypes> NetworkBeaconProcessor<T> {
             };
 
         // Pick out the required blocks, ignoring skip-slots.
-        let mut last_block_root = req
-            .start_slot
-            .checked_sub(1)
-            .map(|prev_slot| {
-                self.chain
-                    .block_root_at_slot(Slot::new(prev_slot), WhenSlotSkipped::Prev)
-            })
-            .transpose()
-            .ok()
-            .flatten()
-            .flatten();
+        let mut last_block_root = req.start_slot.checked_sub(1).and_then(|prev_slot| {
+            self.chain
+                .block_root_at_slot(Slot::new(prev_slot), WhenSlotSkipped::Prev)
+                .ok()
+                .flatten()
+        });
         let maybe_block_roots = process_results(forwards_block_root_iter, |iter| {
             iter.take_while(|(_, slot)| slot.as_u64() < req.start_slot.saturating_add(req.count))
                 // map skip slots to None
diff --git a/beacon_node/network/src/subnet_service/attestation_subnets.rs b/beacon_node/network/src/subnet_service/attestation_subnets.rs
index 02313efbf9..b4f52df39d 100644
--- a/beacon_node/network/src/subnet_service/attestation_subnets.rs
+++ b/beacon_node/network/src/subnet_service/attestation_subnets.rs
@@ -151,7 +151,7 @@ impl<T: BeaconChainTypes> AttestationService<T> {
     }
 
     /// Return count of all currently subscribed subnets (long-lived **and** short-lived).
-    #[cfg(all(test, feature = "spec-mainnet"))]
+    #[cfg(test)]
     pub fn subscription_count(&self) -> usize {
         if self.subscribe_all_subnets {
             self.beacon_chain.spec.attestation_subnet_count as usize
@@ -167,7 +167,7 @@ impl<T: BeaconChainTypes> AttestationService<T> {
     }
 
     /// Returns whether we are subscribed to a subnet for testing purposes.
-    #[cfg(all(test, feature = "spec-mainnet"))]
+    #[cfg(test)]
     pub(crate) fn is_subscribed(
         &self,
         subnet_id: &SubnetId,
@@ -179,7 +179,7 @@ impl<T: BeaconChainTypes> AttestationService<T> {
         }
     }
 
-    #[cfg(all(test, feature = "spec-mainnet"))]
+    #[cfg(test)]
     pub(crate) fn long_lived_subscriptions(&self) -> &HashSet<SubnetId> {
         &self.long_lived_subscriptions
     }
diff --git a/beacon_node/network/src/subnet_service/sync_subnets.rs b/beacon_node/network/src/subnet_service/sync_subnets.rs
index 982962b6ba..eda7ce8efb 100644
--- a/beacon_node/network/src/subnet_service/sync_subnets.rs
+++ b/beacon_node/network/src/subnet_service/sync_subnets.rs
@@ -91,7 +91,7 @@ impl<T: BeaconChainTypes> SyncCommitteeService<T> {
     }
 
     /// Return count of all currently subscribed subnets.
-    #[cfg(all(test, feature = "spec-mainnet"))]
+    #[cfg(test)]
     pub fn subscription_count(&self) -> usize {
         use types::consts::altair::SYNC_COMMITTEE_SUBNET_COUNT;
         if self.subscribe_all_subnets {
diff --git a/beacon_node/network/src/subnet_service/tests/mod.rs b/beacon_node/network/src/subnet_service/tests/mod.rs
index 58a882b4d8..3b8c89a442 100644
--- a/beacon_node/network/src/subnet_service/tests/mod.rs
+++ b/beacon_node/network/src/subnet_service/tests/mod.rs
@@ -1,4 +1,3 @@
-#![cfg(feature = "spec-mainnet")]
 use super::*;
 use beacon_chain::{
     builder::{BeaconChainBuilder, Witness},
diff --git a/beacon_node/network/src/sync/block_lookups/tests.rs b/beacon_node/network/src/sync/block_lookups/tests.rs
index 660e693d2e..ec88ffb162 100644
--- a/beacon_node/network/src/sync/block_lookups/tests.rs
+++ b/beacon_node/network/src/sync/block_lookups/tests.rs
@@ -21,8 +21,8 @@ use types::beacon_block_body::to_block_kzg_commitments;
 use types::{
     map_fork_name, map_fork_name_with,
     test_utils::{SeedableRng, TestRandom, XorShiftRng},
-    BeaconBlock, BlobSidecar, BlobsBundle, EthSpec, ForkName, FullPayloadDeneb,
-    MinimalEthSpec as E, SignedBeaconBlock,
+    BeaconBlock, BlobSidecar, EthSpec, ForkName, FullPayloadDeneb, MinimalEthSpec as E,
+    SignedBeaconBlock,
 };
 
 type T = Witness<ManualSlotClock, CachingEth1Backend<E>, E, MemoryStore<E>, MemoryStore<E>>;
@@ -127,7 +127,7 @@ impl TestRig {
             message.body.blob_kzg_commitments =
                 to_block_kzg_commitments::<E>(bundle.commitments.clone());
 
-            let BlobsBundle {
+            let eth2::types::BlobsBundle {
                 commitments,
                 proofs,
                 blobs,
diff --git a/beacon_node/network/src/sync/manager.rs b/beacon_node/network/src/sync/manager.rs
index dda30a1bf3..b68d054bb4 100644
--- a/beacon_node/network/src/sync/manager.rs
+++ b/beacon_node/network/src/sync/manager.rs
@@ -1108,8 +1108,12 @@ impl<T: BeaconChainTypes> SyncManager<T> {
                     self.log, "Blocks and blobs request for range received invalid data";
                     "peer_id" => %peer_id, "batch_id" => resp.batch_id, "error" => e
                     );
-                    // TODO: penalize the peer for being a bad boy
                     let id = RequestId::RangeBlockAndBlobs { id };
+                    self.network.report_peer(
+                        peer_id,
+                        PeerAction::MidToleranceError,
+                        "block_blob_faulty_batch",
+                    );
                     self.inject_error(peer_id, id, RPCError::InvalidData(e.into()))
                 }
             }
@@ -1160,8 +1164,12 @@ impl<T: BeaconChainTypes> SyncManager<T> {
                         self.log, "Blocks and blobs request for backfill received invalid data";
                         "peer_id" => %peer_id, "batch_id" => resp.batch_id, "error" => e
                     );
-                    // TODO: penalize the peer for being a bad boy
                     let id = RequestId::BackFillBlockAndBlobs { id };
+                    self.network.report_peer(
+                        peer_id,
+                        PeerAction::MidToleranceError,
+                        "block_blob_faulty_backfill_batch",
+                    );
                     self.inject_error(peer_id, id, RPCError::InvalidData(e.into()))
                 }
             }
diff --git a/beacon_node/network/src/sync/network_context.rs b/beacon_node/network/src/sync/network_context.rs
index 4b75f56815..f7779cb76d 100644
--- a/beacon_node/network/src/sync/network_context.rs
+++ b/beacon_node/network/src/sync/network_context.rs
@@ -537,7 +537,7 @@ impl<T: BeaconChainTypes> SyncNetworkContext<T> {
         &self.network_beacon_processor
     }
 
-    pub(crate) fn next_id(&mut self) -> Id {
+    pub fn next_id(&mut self) -> Id {
         let id = self.request_id;
         self.request_id += 1;
         id
@@ -545,7 +545,6 @@ impl<T: BeaconChainTypes> SyncNetworkContext<T> {
 
     /// Check whether a batch for this epoch (and only this epoch) should request just blocks or
     /// blocks and blobs.
-    #[allow(unused)]
     pub fn batch_type(&self, epoch: types::Epoch) -> ByRangeRequestType {
         // Induces a compile time panic if this doesn't hold true.
         #[allow(clippy::assertions_on_constants)]
@@ -555,12 +554,6 @@ impl<T: BeaconChainTypes> SyncNetworkContext<T> {
             "To deal with alignment with deneb boundaries, batches need to be of just one epoch"
         );
 
-        #[cfg(test)]
-        {
-            // Keep tests only for blocks.
-            ByRangeRequestType::Blocks
-        }
-        #[cfg(not(test))]
         if let Some(data_availability_boundary) = self.chain.data_availability_boundary() {
             if epoch >= data_availability_boundary {
                 ByRangeRequestType::BlocksAndBlobs
diff --git a/beacon_node/network/src/sync/range_sync/range.rs b/beacon_node/network/src/sync/range_sync/range.rs
index 4ca518f989..72bb4d3be7 100644
--- a/beacon_node/network/src/sync/range_sync/range.rs
+++ b/beacon_node/network/src/sync/range_sync/range.rs
@@ -384,14 +384,13 @@ mod tests {
     use crate::NetworkMessage;
 
     use super::*;
+    use crate::sync::network_context::BlockOrBlob;
     use beacon_chain::builder::Witness;
     use beacon_chain::eth1_chain::CachingEth1Backend;
     use beacon_chain::parking_lot::RwLock;
     use beacon_chain::test_utils::{BeaconChainHarness, EphemeralHarnessType};
     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 slot_clock::TestingSlotClock;
@@ -399,7 +398,7 @@ mod tests {
     use std::sync::Arc;
     use store::MemoryStore;
     use tokio::sync::mpsc;
-    use types::{Hash256, MinimalEthSpec as E};
+    use types::{ForkName, Hash256, MinimalEthSpec as E};
 
     #[derive(Debug)]
     struct FakeStorage {
@@ -515,18 +514,39 @@ mod tests {
 
         /// Reads an BlocksByRange request to a given peer from the network receiver channel.
         #[track_caller]
-        fn grab_request(&mut self, expected_peer: &PeerId) -> (RequestId, BlocksByRangeRequest) {
-            if let Ok(NetworkMessage::SendRequest {
+        fn grab_request(
+            &mut self,
+            expected_peer: &PeerId,
+            fork_name: ForkName,
+        ) -> (RequestId, Option<RequestId>) {
+            let block_req_id = if let Ok(NetworkMessage::SendRequest {
                 peer_id,
-                request: Request::BlocksByRange(request),
+                request: _,
                 request_id,
             }) = self.network_rx.try_recv()
             {
                 assert_eq!(&peer_id, expected_peer);
-                (request_id, request)
+                request_id
             } else {
                 panic!("Should have sent a batch request to the peer")
-            }
+            };
+            let blob_req_id = match fork_name {
+                ForkName::Deneb => {
+                    if let Ok(NetworkMessage::SendRequest {
+                        peer_id,
+                        request: _,
+                        request_id,
+                    }) = self.network_rx.try_recv()
+                    {
+                        assert_eq!(&peer_id, expected_peer);
+                        Some(request_id)
+                    } else {
+                        panic!("Should have sent a batch request to the peer")
+                    }
+                }
+                _ => None,
+            };
+            (block_req_id, blob_req_id)
         }
 
         /// Produce a head peer
@@ -646,8 +666,14 @@ mod tests {
         range.add_peer(&mut rig.cx, local_info, head_peer, remote_info);
         range.assert_state(RangeSyncType::Head);
 
+        let fork = rig
+            .cx
+            .chain
+            .spec
+            .fork_name_at_epoch(rig.cx.chain.epoch().unwrap());
+
         // Sync should have requested a batch, grab the request.
-        let _request = rig.grab_request(&head_peer);
+        let _ = rig.grab_request(&head_peer, fork);
 
         // Now get a peer with an advanced finalized epoch.
         let (finalized_peer, local_info, remote_info) = rig.finalized_peer();
@@ -655,7 +681,7 @@ mod tests {
         range.assert_state(RangeSyncType::Finalized);
 
         // Sync should have requested a batch, grab the request
-        let _second_request = rig.grab_request(&finalized_peer);
+        let _ = rig.grab_request(&finalized_peer, fork);
 
         // Fail the head chain by disconnecting the peer.
         range.remove_peer(&mut rig.cx, &head_peer);
@@ -673,8 +699,14 @@ mod tests {
         range.add_peer(&mut rig.cx, local_info, head_peer, head_info);
         range.assert_state(RangeSyncType::Head);
 
+        let fork = rig
+            .cx
+            .chain
+            .spec
+            .fork_name_at_epoch(rig.cx.chain.epoch().unwrap());
+
         // Sync should have requested a batch, grab the request.
-        let _request = rig.grab_request(&head_peer);
+        let _ = rig.grab_request(&head_peer, fork);
 
         // Now get a peer with an advanced finalized epoch.
         let (finalized_peer, local_info, remote_info) = rig.finalized_peer();
@@ -683,7 +715,7 @@ mod tests {
         range.assert_state(RangeSyncType::Finalized);
 
         // Sync should have requested a batch, grab the request
-        let _second_request = rig.grab_request(&finalized_peer);
+        let _ = rig.grab_request(&finalized_peer, fork);
 
         // Now the chain knows both chains target roots.
         rig.chain.remember_block(head_peer_root);
@@ -697,15 +729,39 @@ mod tests {
     #[test]
     fn pause_and_resume_on_ee_offline() {
         let (mut rig, mut range) = range(true);
+        let fork = rig
+            .cx
+            .chain
+            .spec
+            .fork_name_at_epoch(rig.cx.chain.epoch().unwrap());
 
         // add some peers
         let (peer1, local_info, head_info) = rig.head_peer();
         range.add_peer(&mut rig.cx, local_info, peer1, head_info);
-        let ((chain1, batch1), id1) = match rig.grab_request(&peer1).0 {
-            RequestId::Sync(crate::sync::manager::RequestId::RangeBlocks { id }) => {
-                (rig.cx.range_sync_block_only_response(id, true).unwrap(), id)
+        let (block_req, blob_req_opt) = rig.grab_request(&peer1, fork);
+
+        let (chain1, batch1, id1) = if blob_req_opt.is_some() {
+            match block_req {
+                RequestId::Sync(crate::sync::manager::RequestId::RangeBlockAndBlobs { id }) => {
+                    let _ = rig
+                        .cx
+                        .range_sync_block_and_blob_response(id, BlockOrBlob::Block(None));
+                    let (chain1, response) = rig
+                        .cx
+                        .range_sync_block_and_blob_response(id, BlockOrBlob::Blob(None))
+                        .unwrap();
+                    (chain1, response.batch_id, id)
+                }
+                other => panic!("unexpected request {:?}", other),
+            }
+        } else {
+            match block_req {
+                RequestId::Sync(crate::sync::manager::RequestId::RangeBlocks { id }) => {
+                    let (chain, batch) = rig.cx.range_sync_block_only_response(id, true).unwrap();
+                    (chain, batch, id)
+                }
+                other => panic!("unexpected request {:?}", other),
             }
-            other => panic!("unexpected request {:?}", other),
         };
 
         // make the ee offline
@@ -720,11 +776,30 @@ mod tests {
         // while the ee is offline, more peers might arrive. Add a new finalized peer.
         let (peer2, local_info, finalized_info) = rig.finalized_peer();
         range.add_peer(&mut rig.cx, local_info, peer2, finalized_info);
-        let ((chain2, batch2), id2) = match rig.grab_request(&peer2).0 {
-            RequestId::Sync(crate::sync::manager::RequestId::RangeBlocks { id }) => {
-                (rig.cx.range_sync_block_only_response(id, true).unwrap(), id)
+        let (block_req, blob_req_opt) = rig.grab_request(&peer2, fork);
+
+        let (chain2, batch2, id2) = if blob_req_opt.is_some() {
+            match block_req {
+                RequestId::Sync(crate::sync::manager::RequestId::RangeBlockAndBlobs { id }) => {
+                    let _ = rig
+                        .cx
+                        .range_sync_block_and_blob_response(id, BlockOrBlob::Block(None));
+                    let (chain2, response) = rig
+                        .cx
+                        .range_sync_block_and_blob_response(id, BlockOrBlob::Blob(None))
+                        .unwrap();
+                    (chain2, response.batch_id, id)
+                }
+                other => panic!("unexpected request {:?}", other),
+            }
+        } else {
+            match block_req {
+                RequestId::Sync(crate::sync::manager::RequestId::RangeBlocks { id }) => {
+                    let (chain, batch) = rig.cx.range_sync_block_only_response(id, true).unwrap();
+                    (chain, batch, id)
+                }
+                other => panic!("unexpected request {:?}", other),
             }
-            other => panic!("unexpected request {:?}", other),
         };
 
         // send the response to the request
diff --git a/beacon_node/src/cli.rs b/beacon_node/src/cli.rs
index c6d7da4e6a..f112bfa732 100644
--- a/beacon_node/src/cli.rs
+++ b/beacon_node/src/cli.rs
@@ -666,7 +666,7 @@ pub fn cli_app<'a, 'b>() -> App<'a, 'b> {
                 .default_value("1")
                 .takes_value(true)
         )
-        /* 4844 settings */
+        /* Deneb settings */
         .arg(
             Arg::with_name("trusted-setup-file-override")
                 .long("trusted-setup-file-override")
@@ -709,6 +709,7 @@ pub fn cli_app<'a, 'b>() -> App<'a, 'b> {
         .arg(
             Arg::with_name("prune-blobs")
                 .long("prune-blobs")
+                .value_name("BOOLEAN")
                 .help("Prune blobs from Lighthouse's database when they are older than the data \
                        data availability boundary relative to the current epoch.")
                 .takes_value(true)
@@ -717,6 +718,7 @@ pub fn cli_app<'a, 'b>() -> App<'a, 'b> {
         .arg(
             Arg::with_name("epochs-per-blob-prune")
                 .long("epochs-per-blob-prune")
+                .value_name("EPOCHS")
                 .help("The epoch interval with which to prune blobs from Lighthouse's \
                        database when they are older than the data availability boundary \
                        relative to the current epoch.")
@@ -726,6 +728,7 @@ pub fn cli_app<'a, 'b>() -> App<'a, 'b> {
         .arg(
             Arg::with_name("blob-prune-margin-epochs")
                 .long("blob-prune-margin-epochs")
+                .value_name("EPOCHS")
                 .help("The margin for blob pruning in epochs. The oldest blobs are pruned \
                        up until data_availability_boundary - blob_prune_margin_epochs.")
                 .takes_value(true)
diff --git a/beacon_node/store/src/config.rs b/beacon_node/store/src/config.rs
index 460084653b..2ff433f11b 100644
--- a/beacon_node/store/src/config.rs
+++ b/beacon_node/store/src/config.rs
@@ -8,7 +8,6 @@ pub const PREV_DEFAULT_SLOTS_PER_RESTORE_POINT: u64 = 2048;
 pub const DEFAULT_SLOTS_PER_RESTORE_POINT: u64 = 8192;
 pub const DEFAULT_BLOCK_CACHE_SIZE: usize = 5;
 pub const DEFAULT_HISTORIC_STATE_CACHE_SIZE: usize = 1;
-pub const DEFAULT_BLOB_CACHE_SIZE: usize = 5;
 pub const DEFAULT_EPOCHS_PER_BLOB_PRUNE: u64 = 1;
 pub const DEFAULT_BLOB_PUNE_MARGIN_EPOCHS: u64 = 0;
 
@@ -23,8 +22,6 @@ pub struct StoreConfig {
     pub block_cache_size: usize,
     /// Maximum number of states from freezer database to store in the in-memory state cache.
     pub historic_state_cache_size: usize,
-    /// Maximum number of blobs to store in the in-memory blob cache.
-    pub blob_cache_size: usize,
     /// Whether to compact the database on initialization.
     pub compact_on_init: bool,
     /// Whether to compact the database during database pruning.
@@ -59,7 +56,6 @@ impl Default for StoreConfig {
             slots_per_restore_point_set_explicitly: false,
             block_cache_size: DEFAULT_BLOCK_CACHE_SIZE,
             historic_state_cache_size: DEFAULT_HISTORIC_STATE_CACHE_SIZE,
-            blob_cache_size: DEFAULT_BLOB_CACHE_SIZE,
             compact_on_init: false,
             compact_on_prune: true,
             prune_payloads: true,
diff --git a/beacon_node/store/src/errors.rs b/beacon_node/store/src/errors.rs
index c19ac03515..11cda6be0c 100644
--- a/beacon_node/store/src/errors.rs
+++ b/beacon_node/store/src/errors.rs
@@ -19,8 +19,6 @@ pub enum Error {
     },
     RlpError(String),
     BlockNotFound(Hash256),
-    /// The blobs sidecar mapping to this block root is older than the data availability boundary.
-    BlobsTooOld(Hash256, Slot),
     NoContinuationData,
     SplitPointModified(Slot, Slot),
     ConfigError(StoreConfigError),
diff --git a/beacon_node/store/src/hot_cold_store.rs b/beacon_node/store/src/hot_cold_store.rs
index 74d8e6fa18..a051966646 100644
--- a/beacon_node/store/src/hot_cold_store.rs
+++ b/beacon_node/store/src/hot_cold_store.rs
@@ -66,10 +66,8 @@ pub struct HotColdDB<E: EthSpec, Hot: ItemStore<E>, Cold: ItemStore<E>> {
     ///
     /// The hot database also contains all blocks.
     pub hot_db: Hot,
-    /// LRU cache of deserialized blobs. Updated whenever a blob is loaded.
-    blob_cache: Mutex<LruCache<Hash256, BlobSidecarList<E>>>,
-    /// LRU cache of deserialized blocks. Updated whenever a block is loaded.
-    block_cache: Mutex<LruCache<Hash256, SignedBeaconBlock<E>>>,
+    /// LRU cache of deserialized blocks and blobs. Updated whenever a block or blob is loaded.
+    block_cache: Mutex<BlockCache<E>>,
     /// LRU cache of replayed states.
     state_cache: Mutex<LruCache<Slot, BeaconState<E>>>,
     /// Chain spec.
@@ -80,6 +78,46 @@ pub struct HotColdDB<E: EthSpec, Hot: ItemStore<E>, Cold: ItemStore<E>> {
     _phantom: PhantomData<E>,
 }
 
+#[derive(Debug)]
+struct BlockCache<E: EthSpec> {
+    block_cache: LruCache<Hash256, SignedBeaconBlock<E>>,
+    blob_cache: LruCache<Hash256, BlobSidecarList<E>>,
+}
+
+impl<E: EthSpec> BlockCache<E> {
+    pub fn new(size: usize) -> Self {
+        Self {
+            block_cache: LruCache::new(size),
+            blob_cache: LruCache::new(size),
+        }
+    }
+    pub fn put_block(&mut self, block_root: Hash256, block: SignedBeaconBlock<E>) {
+        self.block_cache.put(block_root, block);
+    }
+    pub fn put_blobs(&mut self, block_root: Hash256, blobs: BlobSidecarList<E>) {
+        self.blob_cache.put(block_root, blobs);
+    }
+    pub fn get_block<'a>(
+        &'a mut self,
+        block_root: &Hash256,
+    ) -> Option<&'a SignedBeaconBlock<E, FullPayload<E>>> {
+        self.block_cache.get(block_root)
+    }
+    pub fn get_blobs<'a>(&'a mut self, block_root: &Hash256) -> Option<&'a BlobSidecarList<E>> {
+        self.blob_cache.get(block_root)
+    }
+    pub fn delete_block(&mut self, block_root: &Hash256) {
+        let _ = self.block_cache.pop(block_root);
+    }
+    pub fn delete_blobs(&mut self, block_root: &Hash256) {
+        let _ = self.blob_cache.pop(block_root);
+    }
+    pub fn delete(&mut self, block_root: &Hash256) {
+        let _ = self.block_cache.pop(block_root);
+        let _ = self.blob_cache.pop(block_root);
+    }
+}
+
 #[derive(Debug, PartialEq)]
 pub enum HotColdDBError {
     UnsupportedSchemaVersion {
@@ -144,9 +182,8 @@ impl<E: EthSpec> HotColdDB<E, MemoryStore<E>, MemoryStore<E>> {
             cold_db: MemoryStore::open(),
             blobs_db: Some(MemoryStore::open()),
             hot_db: MemoryStore::open(),
-            block_cache: Mutex::new(LruCache::new(config.block_cache_size)),
+            block_cache: Mutex::new(BlockCache::new(config.block_cache_size)),
             state_cache: Mutex::new(LruCache::new(config.historic_state_cache_size)),
-            blob_cache: Mutex::new(LruCache::new(config.blob_cache_size)),
             config,
             spec,
             log,
@@ -182,9 +219,8 @@ impl<E: EthSpec> HotColdDB<E, LevelDB<E>, LevelDB<E>> {
             cold_db: LevelDB::open(cold_path)?,
             blobs_db: None,
             hot_db: LevelDB::open(hot_path)?,
-            block_cache: Mutex::new(LruCache::new(config.block_cache_size)),
+            block_cache: Mutex::new(BlockCache::new(config.block_cache_size)),
             state_cache: Mutex::new(LruCache::new(config.historic_state_cache_size)),
-            blob_cache: Mutex::new(LruCache::new(config.blob_cache_size)),
             config,
             spec,
             log,
@@ -351,7 +387,7 @@ impl<E: EthSpec, Hot: ItemStore<E>, Cold: ItemStore<E>> HotColdDB<E, Hot, Cold>
         let block = self.block_as_kv_store_ops(block_root, block, &mut ops)?;
         self.hot_db.do_atomically(ops)?;
         // Update cache.
-        self.block_cache.lock().put(*block_root, block);
+        self.block_cache.lock().put_block(*block_root, block);
         Ok(())
     }
 
@@ -403,7 +439,7 @@ impl<E: EthSpec, Hot: ItemStore<E>, Cold: ItemStore<E>> HotColdDB<E, Hot, Cold>
         metrics::inc_counter(&metrics::BEACON_BLOCK_GET_COUNT);
 
         // Check the cache.
-        if let Some(block) = self.block_cache.lock().get(block_root) {
+        if let Some(block) = self.block_cache.lock().get_block(block_root) {
             metrics::inc_counter(&metrics::BEACON_BLOCK_CACHE_HIT_COUNT);
             return Ok(Some(DatabaseBlock::Full(block.clone())));
         }
@@ -428,7 +464,9 @@ impl<E: EthSpec, Hot: ItemStore<E>, Cold: ItemStore<E>> HotColdDB<E, Hot, Cold>
             let full_block = self.make_full_block(block_root, blinded_block)?;
 
             // Add to cache.
-            self.block_cache.lock().put(*block_root, full_block.clone());
+            self.block_cache
+                .lock()
+                .put_block(*block_root, full_block.clone());
 
             DatabaseBlock::Full(full_block)
         } else if !self.config.prune_payloads {
@@ -563,7 +601,7 @@ impl<E: EthSpec, Hot: ItemStore<E>, Cold: ItemStore<E>> HotColdDB<E, Hot, Cold>
 
     /// Delete a block from the store and the block cache.
     pub fn delete_block(&self, block_root: &Hash256) -> Result<(), Error> {
-        self.block_cache.lock().pop(block_root);
+        self.block_cache.lock().delete(block_root);
         self.hot_db
             .key_delete(DBColumn::BeaconBlock.into(), block_root.as_bytes())?;
         self.hot_db
@@ -579,7 +617,7 @@ impl<E: EthSpec, Hot: ItemStore<E>, Cold: ItemStore<E>> HotColdDB<E, Hot, Cold>
             block_root.as_bytes(),
             &blobs.as_ssz_bytes(),
         )?;
-        self.blob_cache.lock().push(*block_root, blobs);
+        self.block_cache.lock().put_blobs(*block_root, blobs);
         Ok(())
     }
 
@@ -913,7 +951,6 @@ impl<E: EthSpec, Hot: ItemStore<E>, Cold: ItemStore<E>> HotColdDB<E, Hot, Cold>
         // Update database whilst holding a lock on cache, to ensure that the cache updates
         // atomically with the database.
         let mut guard = self.block_cache.lock();
-        let mut guard_blob = self.blob_cache.lock();
 
         let blob_cache_ops = blobs_ops.clone();
         let blobs_db = self.blobs_db.as_ref().unwrap_or(&self.cold_db);
@@ -947,7 +984,7 @@ impl<E: EthSpec, Hot: ItemStore<E>, Cold: ItemStore<E>> HotColdDB<E, Hot, Cold>
         for op in hot_db_cache_ops {
             match op {
                 StoreOp::PutBlock(block_root, block) => {
-                    guard.put(block_root, (*block).clone());
+                    guard.put_block(block_root, (*block).clone());
                 }
 
                 StoreOp::PutBlobs(_, _) => (),
@@ -961,7 +998,7 @@ impl<E: EthSpec, Hot: ItemStore<E>, Cold: ItemStore<E>> HotColdDB<E, Hot, Cold>
                 StoreOp::DeleteStateTemporaryFlag(_) => (),
 
                 StoreOp::DeleteBlock(block_root) => {
-                    guard.pop(&block_root);
+                    guard.delete_block(&block_root);
                 }
 
                 StoreOp::DeleteBlobs(_) => (),
@@ -979,11 +1016,11 @@ impl<E: EthSpec, Hot: ItemStore<E>, Cold: ItemStore<E>> HotColdDB<E, Hot, Cold>
         for op in blob_cache_ops {
             match op {
                 StoreOp::PutBlobs(block_root, blobs) => {
-                    guard_blob.put(block_root, blobs);
+                    guard.put_blobs(block_root, blobs);
                 }
 
                 StoreOp::DeleteBlobs(block_root) => {
-                    guard_blob.pop(&block_root);
+                    guard.delete_blobs(&block_root);
                 }
 
                 _ => (),
@@ -991,7 +1028,6 @@ impl<E: EthSpec, Hot: ItemStore<E>, Cold: ItemStore<E>> HotColdDB<E, Hot, Cold>
         }
 
         drop(guard);
-        drop(guard_blob);
 
         Ok(())
     }
@@ -1360,12 +1396,18 @@ impl<E: EthSpec, Hot: ItemStore<E>, Cold: ItemStore<E>> HotColdDB<E, Hot, Cold>
     pub fn get_blobs(&self, block_root: &Hash256) -> Result<Option<BlobSidecarList<E>>, Error> {
         let blobs_db = self.blobs_db.as_ref().unwrap_or(&self.cold_db);
 
+        // Check the cache.
+        if let Some(blobs) = self.block_cache.lock().get_blobs(block_root) {
+            metrics::inc_counter(&metrics::BEACON_BLOBS_CACHE_HIT_COUNT);
+            return Ok(Some(blobs.clone()));
+        }
+
         match blobs_db.get_bytes(DBColumn::BeaconBlob.into(), block_root.as_bytes())? {
             Some(ref blobs_bytes) => {
                 let blobs = BlobSidecarList::from_ssz_bytes(blobs_bytes)?;
-                // FIXME(sean) I was attempting to use a blob cache here but was getting deadlocks,
-                // may want to attempt to use one again
-                self.blob_cache.lock().put(*block_root, blobs.clone());
+                self.block_cache
+                    .lock()
+                    .put_blobs(*block_root, blobs.clone());
                 Ok(Some(blobs))
             }
             None => Ok(None),
diff --git a/beacon_node/store/src/lib.rs b/beacon_node/store/src/lib.rs
index e6b6e730e4..074c05a9e1 100644
--- a/beacon_node/store/src/lib.rs
+++ b/beacon_node/store/src/lib.rs
@@ -7,7 +7,6 @@
 //!
 //! Provides a simple API for storing/retrieving all types that sometimes needs type-hints. See
 //! tests for implementation examples.
-#![allow(dead_code)]
 #[macro_use]
 extern crate lazy_static;
 
diff --git a/beacon_node/store/src/metrics.rs b/beacon_node/store/src/metrics.rs
index 72c5e61969..2d901fdd93 100644
--- a/beacon_node/store/src/metrics.rs
+++ b/beacon_node/store/src/metrics.rs
@@ -101,6 +101,10 @@ lazy_static! {
         "store_beacon_block_cache_hit_total",
         "Number of hits to the store's block cache"
     );
+    pub static ref BEACON_BLOBS_CACHE_HIT_COUNT: Result<IntCounter> = try_create_int_counter(
+        "store_beacon_blobs_cache_hit_total",
+        "Number of hits to the store's blob cache"
+    );
     pub static ref BEACON_BLOCK_READ_TIMES: Result<Histogram> = try_create_histogram(
         "store_beacon_block_read_overhead_seconds",
         "Overhead on reading a beacon block from the DB (e.g., decoding)"
diff --git a/common/eth2/Cargo.toml b/common/eth2/Cargo.toml
index d0cb62da29..4f050a01e4 100644
--- a/common/eth2/Cargo.toml
+++ b/common/eth2/Cargo.toml
@@ -10,6 +10,7 @@ edition = "2021"
 serde = { version = "1.0.116", features = ["derive"] }
 serde_json = "1.0.58"
 ssz_types = "0.5.4"
+tree_hash = "0.5.2"
 types = { path = "../../consensus/types" }
 reqwest = { version = "0.11.0", features = ["json", "stream"] }
 lighthouse_network = { path = "../../beacon_node/lighthouse_network" }
diff --git a/common/eth2/src/types.rs b/common/eth2/src/types.rs
index 0a61d075d4..5b113cac99 100644
--- a/common/eth2/src/types.rs
+++ b/common/eth2/src/types.rs
@@ -4,12 +4,16 @@
 use crate::Error as ServerError;
 use lighthouse_network::{ConnectionDirection, Enr, Multiaddr, PeerConnectionStatus};
 use mediatype::{names, MediaType, MediaTypeList};
-use serde::{Deserialize, Serialize};
+use serde::{Deserialize, Deserializer, Serialize};
+use serde_json::Value;
 use ssz_derive::Encode;
 use std::convert::TryFrom;
 use std::fmt::{self, Display};
 use std::str::{from_utf8, FromStr};
 use std::time::Duration;
+use tree_hash::TreeHash;
+use types::beacon_block_body::BuilderKzgCommitments;
+use types::builder_bid::BlindedBlobsBundle;
 pub use types::*;
 
 #[cfg(feature = "lighthouse")]
@@ -1703,3 +1707,100 @@ impl<T: EthSpec, Payload: AbstractExecPayload<T>> ForkVersionDeserialize
         })
     }
 }
+
+#[derive(Clone, Debug, PartialEq, Serialize, Deserialize, Encode)]
+#[serde(untagged)]
+#[serde(bound = "E: EthSpec")]
+#[ssz(enum_behaviour = "transparent")]
+pub enum FullPayloadContents<E: EthSpec> {
+    Payload(ExecutionPayload<E>),
+    PayloadAndBlobs(ExecutionPayloadAndBlobs<E>),
+}
+
+impl<E: EthSpec> FullPayloadContents<E> {
+    pub fn new(
+        execution_payload: ExecutionPayload<E>,
+        maybe_blobs: Option<BlobsBundle<E>>,
+    ) -> Self {
+        match maybe_blobs {
+            None => Self::Payload(execution_payload),
+            Some(blobs_bundle) => Self::PayloadAndBlobs(ExecutionPayloadAndBlobs {
+                execution_payload,
+                blobs_bundle,
+            }),
+        }
+    }
+
+    pub fn payload_ref(&self) -> &ExecutionPayload<E> {
+        match self {
+            FullPayloadContents::Payload(payload) => payload,
+            FullPayloadContents::PayloadAndBlobs(payload_and_blobs) => {
+                &payload_and_blobs.execution_payload
+            }
+        }
+    }
+
+    pub fn block_hash(&self) -> ExecutionBlockHash {
+        self.payload_ref().block_hash()
+    }
+
+    pub fn deconstruct(self) -> (ExecutionPayload<E>, Option<BlobsBundle<E>>) {
+        match self {
+            FullPayloadContents::Payload(payload) => (payload, None),
+            FullPayloadContents::PayloadAndBlobs(payload_and_blobs) => (
+                payload_and_blobs.execution_payload,
+                Some(payload_and_blobs.blobs_bundle),
+            ),
+        }
+    }
+}
+
+impl<E: EthSpec> ForkVersionDeserialize for FullPayloadContents<E> {
+    fn deserialize_by_fork<'de, D: Deserializer<'de>>(
+        value: Value,
+        fork_name: ForkName,
+    ) -> Result<Self, D::Error> {
+        match fork_name {
+            ForkName::Merge | ForkName::Capella => serde_json::from_value(value)
+                .map(Self::Payload)
+                .map_err(serde::de::Error::custom),
+            ForkName::Deneb => serde_json::from_value(value)
+                .map(Self::PayloadAndBlobs)
+                .map_err(serde::de::Error::custom),
+            ForkName::Base | ForkName::Altair => Err(serde::de::Error::custom(format!(
+                "FullPayloadContents deserialization for {fork_name} not implemented"
+            ))),
+        }
+    }
+}
+
+#[derive(Clone, Debug, PartialEq, Serialize, Deserialize, Encode)]
+#[serde(bound = "E: EthSpec")]
+pub struct ExecutionPayloadAndBlobs<E: EthSpec> {
+    pub execution_payload: ExecutionPayload<E>,
+    pub blobs_bundle: BlobsBundle<E>,
+}
+
+#[derive(Clone, Debug, Default, PartialEq, Serialize, Deserialize, Encode)]
+#[serde(bound = "E: EthSpec")]
+pub struct BlobsBundle<E: EthSpec> {
+    pub commitments: BuilderKzgCommitments<E>,
+    pub proofs: KzgProofs<E>,
+    #[serde(with = "ssz_types::serde_utils::list_of_hex_fixed_vec")]
+    pub blobs: BlobsList<E>,
+}
+
+impl<E: EthSpec> Into<BlindedBlobsBundle<E>> for BlobsBundle<E> {
+    fn into(self) -> BlindedBlobsBundle<E> {
+        BlindedBlobsBundle {
+            commitments: self.commitments,
+            proofs: self.proofs,
+            blob_roots: self
+                .blobs
+                .into_iter()
+                .map(|blob| blob.tree_hash_root())
+                .collect::<Vec<_>>()
+                .into(),
+        }
+    }
+}
diff --git a/common/eth2_network_config/built_in_network_configs/deneb/boot_enr.yaml b/common/eth2_network_config/built_in_network_configs/deneb/boot_enr.yaml
deleted file mode 100644
index b4947f4288..0000000000
--- a/common/eth2_network_config/built_in_network_configs/deneb/boot_enr.yaml
+++ /dev/null
@@ -1 +0,0 @@
-- enr:-Iq4QAw-ZQb0IiosZgDDcK5ehLs1XmwT0BWU1E1W3ZnhlAAwAE3I46dgCsCbeB5QUwcpDmpFfveTfKF7-tiIg0KWGjqGAYXoIfe6gmlkgnY0gmlwhKEjXcqJc2VjcDI1NmsxoQN4HpB2GMFY2MzwO9hGFjqRG47OX4hGDliAG-mJNWkEr4N1ZHCCIyk
diff --git a/common/eth2_network_config/built_in_network_configs/deneb/config.yaml b/common/eth2_network_config/built_in_network_configs/deneb/config.yaml
deleted file mode 100644
index 350a06728b..0000000000
--- a/common/eth2_network_config/built_in_network_configs/deneb/config.yaml
+++ /dev/null
@@ -1,76 +0,0 @@
-# Extends the mainnet preset
-PRESET_BASE: 'mainnet'
-CONFIG_NAME: 'deneb' # needs to exist because of Prysm. Otherwise it conflicts with mainnet genesis and needs to match configuration in common_eth2_config/src/lib.rs to pass lh ci.
-
-# Genesis
-# ---------------------------------------------------------------
-# `2**14` (= 16,384)
-MIN_GENESIS_ACTIVE_VALIDATOR_COUNT: 9000
-# Mar-01-2021 08:53:32 AM +UTC
-# This is an invalid valid and should be updated when you create the genesis
-MIN_GENESIS_TIME: 1674639000
-GENESIS_FORK_VERSION: 0x10484404
-GENESIS_DELAY: 120
-
-
-# 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: 0x20484404
-ALTAIR_FORK_EPOCH: 0
-# Merge
-BELLATRIX_FORK_VERSION: 0x30484404
-BELLATRIX_FORK_EPOCH: 0
-TERMINAL_TOTAL_DIFFICULTY: 0
-TERMINAL_BLOCK_HASH: 0x0000000000000000000000000000000000000000000000000000000000000000
-TERMINAL_BLOCK_HASH_ACTIVATION_EPOCH: 18446744073709551615
-
-# Capella
-CAPELLA_FORK_VERSION: 0x40484404
-CAPELLA_FORK_EPOCH: 1
-
-# DENEB/Deneb
-DENEB_FORK_VERSION: 0x50484404
-DENEB_FORK_EPOCH: 5
-
-# Time parameters
-# ---------------------------------------------------------------
-# 12 seconds
-SECONDS_PER_SLOT: 12
-# 14 (estimate from Eth1 mainnet)
-SECONDS_PER_ETH1_BLOCK: 12
-# 2**0 (= 1) epochs ~1 hours
-MIN_VALIDATOR_WITHDRAWABILITY_DELAY: 1
-# 2**8 (= 256) epochs ~27 hours
-SHARD_COMMITTEE_PERIOD: 1
-# 2**11 (= 2,048) Eth1 blocks ~8 hours
-ETH1_FOLLOW_DISTANCE: 12
-
-
-# Validator cycle
-# ---------------------------------------------------------------
-# 2**2 (= 4)
-INACTIVITY_SCORE_BIAS: 4
-# 2**4 (= 16)
-INACTIVITY_SCORE_RECOVERY_RATE: 16
-# 2**4 * 10**9 (= 16,000,000,000) Gwei
-EJECTION_BALANCE: 31000000000
-# 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: 4844001004
-DEPOSIT_NETWORK_ID: 4844001004
-DEPOSIT_CONTRACT_ADDRESS: 0x4242424242424242424242424242424242424242
diff --git a/common/eth2_network_config/built_in_network_configs/deneb/genesis.ssz.zip b/common/eth2_network_config/built_in_network_configs/deneb/genesis.ssz.zip
deleted file mode 100644
index 0df154bbd7..0000000000
Binary files a/common/eth2_network_config/built_in_network_configs/deneb/genesis.ssz.zip and /dev/null differ
diff --git a/consensus/serde_utils/src/u256_hex_be_opt.rs b/consensus/serde_utils/src/u256_hex_be_opt.rs
deleted file mode 100644
index e69de29bb2..0000000000
diff --git a/consensus/state_processing/src/per_block_processing/deneb.rs b/consensus/state_processing/src/per_block_processing/deneb.rs
index 68d53da9d7..8f7cb0514f 100644
--- a/consensus/state_processing/src/per_block_processing/deneb.rs
+++ b/consensus/state_processing/src/per_block_processing/deneb.rs
@@ -1,2 +1,9 @@
-#[allow(clippy::module_inception)]
-pub mod deneb;
+use ethereum_hashing::hash_fixed;
+use types::consts::deneb::VERSIONED_HASH_VERSION_KZG;
+use types::{KzgCommitment, VersionedHash};
+
+pub fn kzg_commitment_to_versioned_hash(kzg_commitment: &KzgCommitment) -> VersionedHash {
+    let mut hashed_commitment = hash_fixed(&kzg_commitment.0);
+    hashed_commitment[0] = VERSIONED_HASH_VERSION_KZG;
+    VersionedHash::from(hashed_commitment)
+}
diff --git a/consensus/state_processing/src/per_block_processing/deneb/deneb.rs b/consensus/state_processing/src/per_block_processing/deneb/deneb.rs
deleted file mode 100644
index 8f7cb0514f..0000000000
--- a/consensus/state_processing/src/per_block_processing/deneb/deneb.rs
+++ /dev/null
@@ -1,9 +0,0 @@
-use ethereum_hashing::hash_fixed;
-use types::consts::deneb::VERSIONED_HASH_VERSION_KZG;
-use types::{KzgCommitment, VersionedHash};
-
-pub fn kzg_commitment_to_versioned_hash(kzg_commitment: &KzgCommitment) -> VersionedHash {
-    let mut hashed_commitment = hash_fixed(&kzg_commitment.0);
-    hashed_commitment[0] = VERSIONED_HASH_VERSION_KZG;
-    VersionedHash::from(hashed_commitment)
-}
diff --git a/consensus/state_processing/src/per_block_processing/errors.rs b/consensus/state_processing/src/per_block_processing/errors.rs
index 016460080d..de1c132951 100644
--- a/consensus/state_processing/src/per_block_processing/errors.rs
+++ b/consensus/state_processing/src/per_block_processing/errors.rs
@@ -88,18 +88,6 @@ pub enum BlockProcessingError {
         expected: Hash256,
         found: Hash256,
     },
-    BlobVersionHashMismatch,
-    /// The number of commitments in blob transactions in the payload does not match the number
-    /// of commitments in the block.
-    BlobNumCommitmentsMismatch {
-        commitments_processed_in_block: usize,
-        /// This number depic
-        commitments_processed_in_transactions: usize,
-    },
-    BlobVersionHashIndexOutOfBounds {
-        index: usize,
-        length: usize,
-    },
     WithdrawalCredentialsInvalid,
     ParticipationCacheError(ParticipationCacheError),
 }
diff --git a/consensus/types/src/beacon_block_body.rs b/consensus/types/src/beacon_block_body.rs
index 6c31e8cc1a..decccb1fbf 100644
--- a/consensus/types/src/beacon_block_body.rs
+++ b/consensus/types/src/beacon_block_body.rs
@@ -9,19 +9,21 @@ use superstruct::superstruct;
 use test_random_derive::TestRandom;
 use tree_hash_derive::TreeHash;
 
-pub type KzgCommitments<T> = VariableList<KzgCommitment, <T as EthSpec>::MaxBlobsPerBlock>;
+//TODO: Remove this type and use `BlockBodyKzgCommitments` everywhere when this PR is merged:
+// https://github.com/ethereum/builder-specs/pull/87
+pub type BuilderKzgCommitments<T> = VariableList<KzgCommitment, <T as EthSpec>::MaxBlobsPerBlock>;
 pub type BlockBodyKzgCommitments<T> =
     VariableList<KzgCommitment, <T as EthSpec>::MaxBlobCommitmentsPerBlock>;
 
 pub fn to_block_kzg_commitments<E: EthSpec>(
-    commitments: KzgCommitments<E>,
+    commitments: BuilderKzgCommitments<E>,
 ) -> BlockBodyKzgCommitments<E> {
     commitments.to_vec().into()
 }
 
 pub fn from_block_kzg_commitments<E: EthSpec>(
     commitments: &BlockBodyKzgCommitments<E>,
-) -> KzgCommitments<E> {
+) -> BuilderKzgCommitments<E> {
     commitments.to_vec().into()
 }
 
diff --git a/consensus/types/src/blob_sidecar.rs b/consensus/types/src/blob_sidecar.rs
index 4e29e7cd69..f19068edfb 100644
--- a/consensus/types/src/blob_sidecar.rs
+++ b/consensus/types/src/blob_sidecar.rs
@@ -1,112 +1,21 @@
+use crate::test_utils::TestRandom;
+use crate::{Blob, ChainSpec, Domain, EthSpec, Fork, Hash256, SignedBlobSidecar, SignedRoot, Slot};
+use bls::SecretKey;
+use derivative::Derivative;
+use kzg::{Kzg, KzgCommitment, KzgPreset, KzgProof};
+use rand::Rng;
+use serde_derive::{Deserialize, Serialize};
+use ssz::Encode;
+use ssz_derive::{Decode, Encode};
+use ssz_types::{FixedVector, VariableList};
 use std::fmt::Debug;
 use std::hash::Hash;
 use std::marker::PhantomData;
 use std::sync::Arc;
-
-use derivative::Derivative;
-use kzg::{Kzg, KzgCommitment, KzgPreset, KzgProof};
-use rand::Rng;
-use serde::de::DeserializeOwned;
-use serde_derive::{Deserialize, Serialize};
-use ssz::{Decode, Encode};
-use ssz_derive::{Decode, Encode};
-use ssz_types::{FixedVector, VariableList};
+use test_random_derive::TestRandom;
 use tree_hash::TreeHash;
 use tree_hash_derive::TreeHash;
 
-use bls::SecretKey;
-use test_random_derive::TestRandom;
-
-use crate::beacon_block_body::KzgCommitments;
-use crate::test_utils::TestRandom;
-use crate::{
-    AbstractExecPayload, BeaconBlock, Blob, ChainSpec, Domain, EthSpec, Fork, Hash256,
-    SignedBlobSidecar, SignedRoot, Slot,
-};
-
-pub trait Sidecar<E: EthSpec>:
-    serde::Serialize
-    + Clone
-    + DeserializeOwned
-    + Encode
-    + Decode
-    + Hash
-    + TreeHash
-    + TestRandom
-    + Debug
-    + SignedRoot
-    + Sync
-    + Send
-    + for<'a> arbitrary::Arbitrary<'a>
-{
-    type BlobItems: BlobItems<E>;
-    fn slot(&self) -> Slot;
-    fn build_sidecar<Payload: AbstractExecPayload<E>>(
-        blob_items: Self::BlobItems,
-        block: &BeaconBlock<E, Payload>,
-        expected_kzg_commitments: &KzgCommitments<E>,
-        kzg_proofs: Vec<KzgProof>,
-    ) -> Result<SidecarList<E, Self>, String>;
-}
-
-pub trait BlobItems<T: EthSpec>: Sync + Send + Sized {
-    fn try_from_blob_roots(roots: BlobRootsList<T>) -> Result<Self, String>;
-    fn try_from_blobs(blobs: BlobsList<T>) -> Result<Self, String>;
-    fn len(&self) -> usize;
-    fn is_empty(&self) -> bool;
-    fn blobs(&self) -> Option<&BlobsList<T>>;
-}
-
-impl<T: EthSpec> BlobItems<T> for BlobsList<T> {
-    fn try_from_blob_roots(_roots: BlobRootsList<T>) -> Result<Self, String> {
-        Err("Unexpected conversion from blob roots to blobs".to_string())
-    }
-
-    fn try_from_blobs(blobs: BlobsList<T>) -> Result<Self, String> {
-        Ok(blobs)
-    }
-
-    fn len(&self) -> usize {
-        VariableList::len(self)
-    }
-
-    fn is_empty(&self) -> bool {
-        VariableList::is_empty(self)
-    }
-
-    fn blobs(&self) -> Option<&BlobsList<T>> {
-        Some(self)
-    }
-}
-
-impl<T: EthSpec> BlobItems<T> for BlobRootsList<T> {
-    fn try_from_blob_roots(roots: BlobRootsList<T>) -> Result<Self, String> {
-        Ok(roots)
-    }
-
-    fn try_from_blobs(blobs: BlobsList<T>) -> Result<Self, String> {
-        VariableList::new(
-            blobs
-                .into_iter()
-                .map(|blob| blob.tree_hash_root())
-                .collect(),
-        )
-        .map_err(|e| format!("{e:?}"))
-    }
-
-    fn len(&self) -> usize {
-        VariableList::len(self)
-    }
-
-    fn is_empty(&self) -> bool {
-        VariableList::is_empty(self)
-    }
-
-    fn blobs(&self) -> Option<&BlobsList<T>> {
-        None
-    }
-}
-
 /// Container of the data that identifies an individual blob.
 #[derive(
     Serialize, Deserialize, Encode, Decode, TreeHash, Copy, Clone, Debug, PartialEq, Eq, Hash,
@@ -158,52 +67,6 @@ pub struct BlobSidecar<T: EthSpec> {
     pub kzg_proof: KzgProof,
 }
 
-impl<E: EthSpec> Sidecar<E> for BlobSidecar<E> {
-    type BlobItems = BlobsList<E>;
-
-    fn slot(&self) -> Slot {
-        self.slot
-    }
-
-    fn build_sidecar<Payload: AbstractExecPayload<E>>(
-        blobs: BlobsList<E>,
-        block: &BeaconBlock<E, Payload>,
-        expected_kzg_commitments: &KzgCommitments<E>,
-        kzg_proofs: Vec<KzgProof>,
-    ) -> Result<SidecarList<E, Self>, String> {
-        let beacon_block_root = block.canonical_root();
-        let slot = block.slot();
-        let blob_sidecars = BlobSidecarList::from(
-            blobs
-                .into_iter()
-                .enumerate()
-                .map(|(blob_index, blob)| {
-                    let kzg_commitment = expected_kzg_commitments
-                        .get(blob_index)
-                        .ok_or("KZG commitment should exist for blob")?;
-
-                    let kzg_proof = kzg_proofs
-                        .get(blob_index)
-                        .ok_or("KZG proof should exist for blob")?;
-
-                    Ok(Arc::new(BlobSidecar {
-                        block_root: beacon_block_root,
-                        index: blob_index as u64,
-                        slot,
-                        block_parent_root: block.parent_root(),
-                        proposer_index: block.proposer_index(),
-                        blob,
-                        kzg_commitment: *kzg_commitment,
-                        kzg_proof: *kzg_proof,
-                    }))
-                })
-                .collect::<Result<Vec<_>, String>>()?,
-        );
-
-        Ok(blob_sidecars)
-    }
-}
-
 impl<E: EthSpec> From<Arc<BlobSidecar<E>>> for BlindedBlobSidecar {
     fn from(blob_sidecar: Arc<BlobSidecar<E>>) -> Self {
         BlindedBlobSidecar {
@@ -353,54 +216,6 @@ pub struct BlindedBlobSidecar {
 
 impl SignedRoot for BlindedBlobSidecar {}
 
-impl<E: EthSpec> Sidecar<E> for BlindedBlobSidecar {
-    type BlobItems = BlobRootsList<E>;
-
-    fn slot(&self) -> Slot {
-        self.slot
-    }
-
-    fn build_sidecar<Payload: AbstractExecPayload<E>>(
-        blob_roots: BlobRootsList<E>,
-        block: &BeaconBlock<E, Payload>,
-        expected_kzg_commitments: &KzgCommitments<E>,
-        kzg_proofs: Vec<KzgProof>,
-    ) -> Result<SidecarList<E, BlindedBlobSidecar>, String> {
-        let beacon_block_root = block.canonical_root();
-        let slot = block.slot();
-
-        let blob_sidecars = BlindedBlobSidecarList::<E>::from(
-            blob_roots
-                .into_iter()
-                .enumerate()
-                .map(|(blob_index, blob_root)| {
-                    let kzg_commitment = expected_kzg_commitments
-                        .get(blob_index)
-                        .ok_or("KZG commitment should exist for blob")?;
-
-                    let kzg_proof = kzg_proofs.get(blob_index).ok_or(format!(
-                        "Missing KZG proof for slot {} blob index: {}",
-                        slot, blob_index
-                    ))?;
-
-                    Ok(Arc::new(BlindedBlobSidecar {
-                        block_root: beacon_block_root,
-                        index: blob_index as u64,
-                        slot,
-                        block_parent_root: block.parent_root(),
-                        proposer_index: block.proposer_index(),
-                        blob_root,
-                        kzg_commitment: *kzg_commitment,
-                        kzg_proof: *kzg_proof,
-                    }))
-                })
-                .collect::<Result<Vec<_>, String>>()?,
-        );
-
-        Ok(blob_sidecars)
-    }
-}
-
 pub type SidecarList<T, Sidecar> = VariableList<Arc<Sidecar>, <T as EthSpec>::MaxBlobsPerBlock>;
 pub type BlobSidecarList<T> = SidecarList<T, BlobSidecar<T>>;
 pub type BlindedBlobSidecarList<T> = SidecarList<T, BlindedBlobSidecar>;
diff --git a/consensus/types/src/builder_bid.rs b/consensus/types/src/builder_bid.rs
index bc358dc17f..cdd240716d 100644
--- a/consensus/types/src/builder_bid.rs
+++ b/consensus/types/src/builder_bid.rs
@@ -1,8 +1,8 @@
-use crate::beacon_block_body::KzgCommitments;
+use crate::beacon_block_body::BuilderKzgCommitments;
 use crate::{
-    BlobRootsList, BlobsBundle, ChainSpec, EthSpec, ExecutionPayloadHeaderCapella,
-    ExecutionPayloadHeaderDeneb, ExecutionPayloadHeaderMerge, ExecutionPayloadHeaderRef, ForkName,
-    ForkVersionDeserialize, KzgProofs, SignedRoot, Uint256,
+    BlobRootsList, ChainSpec, EthSpec, ExecutionPayloadHeaderCapella, ExecutionPayloadHeaderDeneb,
+    ExecutionPayloadHeaderMerge, ExecutionPayloadHeaderRef, ForkName, ForkVersionDeserialize,
+    KzgProofs, SignedRoot, Uint256,
 };
 use bls::PublicKeyBytes;
 use bls::Signature;
@@ -10,32 +10,16 @@ use serde::Deserializer;
 use serde_derive::{Deserialize, Serialize};
 use ssz_derive::Encode;
 use superstruct::superstruct;
-use tree_hash::TreeHash;
 use tree_hash_derive::TreeHash;
 
 #[derive(PartialEq, Debug, Default, Serialize, Deserialize, TreeHash, Clone, Encode)]
 #[serde(bound = "E: EthSpec")]
 pub struct BlindedBlobsBundle<E: EthSpec> {
-    pub commitments: KzgCommitments<E>,
+    pub commitments: BuilderKzgCommitments<E>,
     pub proofs: KzgProofs<E>,
     pub blob_roots: BlobRootsList<E>,
 }
 
-impl<E: EthSpec> From<BlobsBundle<E>> for BlindedBlobsBundle<E> {
-    fn from(blobs_bundle: BlobsBundle<E>) -> Self {
-        BlindedBlobsBundle {
-            commitments: blobs_bundle.commitments,
-            proofs: blobs_bundle.proofs,
-            blob_roots: blobs_bundle
-                .blobs
-                .into_iter()
-                .map(|blob| blob.tree_hash_root())
-                .collect::<Vec<_>>()
-                .into(),
-        }
-    }
-}
-
 #[superstruct(
     variants(Merge, Capella, Deneb),
     variant_attributes(
diff --git a/consensus/types/src/consts.rs b/consensus/types/src/consts.rs
index cdeff2cbd5..7fa03dc5f8 100644
--- a/consensus/types/src/consts.rs
+++ b/consensus/types/src/consts.rs
@@ -36,4 +36,5 @@ pub mod deneb {
     }
     pub const VERSIONED_HASH_VERSION_KZG: u8 = 1;
     pub const BLOB_SIDECAR_SUBNET_COUNT: u64 = 6;
+    pub const MAX_BLOBS_PER_BLOCK: u64 = BLOB_SIDECAR_SUBNET_COUNT;
 }
diff --git a/consensus/types/src/execution_block_header.rs b/consensus/types/src/execution_block_header.rs
index 5ec5484cab..945222a925 100644
--- a/consensus/types/src/execution_block_header.rs
+++ b/consensus/types/src/execution_block_header.rs
@@ -24,7 +24,7 @@ use metastruct::metastruct;
 ///
 /// Credit to Reth for the type definition.
 #[derive(Debug, Clone, PartialEq, Eq, Hash)]
-#[metastruct(mappings(map_execution_block_header_fields_except_withdrawals(exclude(
+#[metastruct(mappings(map_execution_block_header_fields_base(exclude(
     withdrawals_root,
     blob_gas_used,
     excess_blob_gas,
diff --git a/consensus/types/src/lib.rs b/consensus/types/src/lib.rs
index 5008bdf632..470e6acc18 100644
--- a/consensus/types/src/lib.rs
+++ b/consensus/types/src/lib.rs
@@ -99,6 +99,7 @@ pub mod slot_data;
 pub mod sqlite;
 
 pub mod blob_sidecar;
+pub mod sidecar;
 pub mod signed_blob;
 
 use ethereum_types::{H160, H256};
@@ -121,7 +122,7 @@ pub use crate::beacon_committee::{BeaconCommittee, OwnedBeaconCommittee};
 pub use crate::beacon_state::{BeaconTreeHashCache, Error as BeaconStateError, *};
 pub use crate::blob_sidecar::{
     BlindedBlobSidecar, BlindedBlobSidecarList, BlobRootsList, BlobSidecar, BlobSidecarList,
-    BlobsList, Sidecar, SidecarList,
+    BlobsList, SidecarList,
 };
 pub use crate::bls_to_execution_change::BlsToExecutionChange;
 pub use crate::chain_spec::{ChainSpec, Config, Domain};
@@ -161,9 +162,8 @@ pub use crate::participation_flags::ParticipationFlags;
 pub use crate::participation_list::ParticipationList;
 pub use crate::payload::{
     AbstractExecPayload, BlindedPayload, BlindedPayloadCapella, BlindedPayloadDeneb,
-    BlindedPayloadMerge, BlindedPayloadRef, BlobsBundle, BlockType, ExecPayload,
-    ExecutionPayloadAndBlobs, FullPayload, FullPayloadCapella, FullPayloadContents,
-    FullPayloadDeneb, FullPayloadMerge, FullPayloadRef, OwnedExecPayload,
+    BlindedPayloadMerge, BlindedPayloadRef, BlockType, ExecPayload, FullPayload,
+    FullPayloadCapella, FullPayloadDeneb, FullPayloadMerge, FullPayloadRef, OwnedExecPayload,
 };
 pub use crate::pending_attestation::PendingAttestation;
 pub use crate::preset::{AltairPreset, BasePreset, BellatrixPreset, CapellaPreset};
@@ -221,5 +221,6 @@ pub use bls::{
 
 pub use kzg::{KzgCommitment, KzgProof};
 
+pub use sidecar::Sidecar;
 pub use ssz_types::{typenum, typenum::Unsigned, BitList, BitVector, FixedVector, VariableList};
 pub use superstruct::superstruct;
diff --git a/consensus/types/src/payload.rs b/consensus/types/src/payload.rs
index a1b513d3fa..f89e325986 100644
--- a/consensus/types/src/payload.rs
+++ b/consensus/types/src/payload.rs
@@ -1,9 +1,7 @@
-use crate::beacon_block_body::KzgCommitments;
 use crate::{test_utils::TestRandom, *};
 use derivative::Derivative;
 use serde::de::DeserializeOwned;
-use serde::{Deserialize, Deserializer, Serialize};
-use serde_json::Value;
+use serde::{Deserialize, Serialize};
 use ssz::{Decode, Encode};
 use ssz_derive::{Decode, Encode};
 use std::borrow::Cow;
@@ -971,85 +969,3 @@ impl<T: EthSpec> From<BlindedPayload<T>> for ExecutionPayloadHeader<T> {
         }
     }
 }
-
-#[derive(Clone, Debug, PartialEq, Serialize, Deserialize, Encode)]
-#[serde(untagged)]
-#[serde(bound = "E: EthSpec")]
-#[ssz(enum_behaviour = "transparent")]
-pub enum FullPayloadContents<E: EthSpec> {
-    Payload(ExecutionPayload<E>),
-    PayloadAndBlobs(ExecutionPayloadAndBlobs<E>),
-}
-
-impl<E: EthSpec> FullPayloadContents<E> {
-    pub fn new(
-        execution_payload: ExecutionPayload<E>,
-        maybe_blobs: Option<BlobsBundle<E>>,
-    ) -> Self {
-        match maybe_blobs {
-            None => Self::Payload(execution_payload),
-            Some(blobs_bundle) => Self::PayloadAndBlobs(ExecutionPayloadAndBlobs {
-                execution_payload,
-                blobs_bundle,
-            }),
-        }
-    }
-
-    pub fn payload_ref(&self) -> &ExecutionPayload<E> {
-        match self {
-            FullPayloadContents::Payload(payload) => payload,
-            FullPayloadContents::PayloadAndBlobs(payload_and_blobs) => {
-                &payload_and_blobs.execution_payload
-            }
-        }
-    }
-
-    pub fn block_hash(&self) -> ExecutionBlockHash {
-        self.payload_ref().block_hash()
-    }
-
-    pub fn deconstruct(self) -> (ExecutionPayload<E>, Option<BlobsBundle<E>>) {
-        match self {
-            FullPayloadContents::Payload(payload) => (payload, None),
-            FullPayloadContents::PayloadAndBlobs(payload_and_blobs) => (
-                payload_and_blobs.execution_payload,
-                Some(payload_and_blobs.blobs_bundle),
-            ),
-        }
-    }
-}
-
-impl<E: EthSpec> ForkVersionDeserialize for FullPayloadContents<E> {
-    fn deserialize_by_fork<'de, D: Deserializer<'de>>(
-        value: Value,
-        fork_name: ForkName,
-    ) -> Result<Self, D::Error> {
-        match fork_name {
-            ForkName::Merge | ForkName::Capella => serde_json::from_value(value)
-                .map(Self::Payload)
-                .map_err(serde::de::Error::custom),
-            ForkName::Deneb => serde_json::from_value(value)
-                .map(Self::PayloadAndBlobs)
-                .map_err(serde::de::Error::custom),
-            ForkName::Base | ForkName::Altair => Err(serde::de::Error::custom(format!(
-                "FullPayloadContents deserialization for {fork_name} not implemented"
-            ))),
-        }
-    }
-}
-
-#[derive(Clone, Debug, PartialEq, Serialize, Deserialize, Encode)]
-#[serde(bound = "E: EthSpec")]
-pub struct ExecutionPayloadAndBlobs<E: EthSpec> {
-    pub execution_payload: ExecutionPayload<E>,
-    pub blobs_bundle: BlobsBundle<E>,
-}
-
-#[derive(Clone, Debug, Default, PartialEq, Serialize, Deserialize, Encode)]
-#[serde(bound = "E: EthSpec")]
-pub struct BlobsBundle<E: EthSpec> {
-    pub commitments: KzgCommitments<E>,
-    pub proofs: KzgProofs<E>,
-    #[serde(with = "ssz_types::serde_utils::list_of_hex_fixed_vec")]
-    pub blobs: BlobsList<E>,
-}
diff --git a/consensus/types/src/sidecar.rs b/consensus/types/src/sidecar.rs
new file mode 100644
index 0000000000..7feb85ce8f
--- /dev/null
+++ b/consensus/types/src/sidecar.rs
@@ -0,0 +1,191 @@
+use crate::beacon_block_body::BuilderKzgCommitments;
+use crate::test_utils::TestRandom;
+use crate::{
+    AbstractExecPayload, BeaconBlock, BlindedBlobSidecar, BlindedBlobSidecarList, BlobRootsList,
+    BlobSidecar, BlobSidecarList, BlobsList, EthSpec, SidecarList, SignedRoot, Slot,
+};
+use kzg::KzgProof;
+use serde::de::DeserializeOwned;
+use ssz::{Decode, Encode};
+use ssz_types::VariableList;
+use std::fmt::Debug;
+use std::hash::Hash;
+use std::sync::Arc;
+use tree_hash::TreeHash;
+
+pub trait Sidecar<E: EthSpec>:
+    serde::Serialize
+    + Clone
+    + DeserializeOwned
+    + Encode
+    + Decode
+    + Hash
+    + TreeHash
+    + TestRandom
+    + Debug
+    + SignedRoot
+    + Sync
+    + Send
+    + for<'a> arbitrary::Arbitrary<'a>
+{
+    type BlobItems: BlobItems<E>;
+    fn slot(&self) -> Slot;
+    fn build_sidecar<Payload: AbstractExecPayload<E>>(
+        blob_items: Self::BlobItems,
+        block: &BeaconBlock<E, Payload>,
+        expected_kzg_commitments: &BuilderKzgCommitments<E>,
+        kzg_proofs: Vec<KzgProof>,
+    ) -> Result<SidecarList<E, Self>, String>;
+}
+
+pub trait BlobItems<T: EthSpec>: Sync + Send + Sized {
+    fn try_from_blob_roots(roots: BlobRootsList<T>) -> Result<Self, String>;
+    fn try_from_blobs(blobs: BlobsList<T>) -> Result<Self, String>;
+    fn len(&self) -> usize;
+    fn is_empty(&self) -> bool;
+    fn blobs(&self) -> Option<&BlobsList<T>>;
+}
+
+impl<T: EthSpec> BlobItems<T> for BlobsList<T> {
+    fn try_from_blob_roots(_roots: BlobRootsList<T>) -> Result<Self, String> {
+        Err("Unexpected conversion from blob roots to blobs".to_string())
+    }
+
+    fn try_from_blobs(blobs: BlobsList<T>) -> Result<Self, String> {
+        Ok(blobs)
+    }
+
+    fn len(&self) -> usize {
+        VariableList::len(self)
+    }
+
+    fn is_empty(&self) -> bool {
+        VariableList::is_empty(self)
+    }
+
+    fn blobs(&self) -> Option<&BlobsList<T>> {
+        Some(self)
+    }
+}
+
+impl<T: EthSpec> BlobItems<T> for BlobRootsList<T> {
+    fn try_from_blob_roots(roots: BlobRootsList<T>) -> Result<Self, String> {
+        Ok(roots)
+    }
+
+    fn try_from_blobs(blobs: BlobsList<T>) -> Result<Self, String> {
+        VariableList::new(
+            blobs
+                .into_iter()
+                .map(|blob| blob.tree_hash_root())
+                .collect(),
+        )
+        .map_err(|e| format!("{e:?}"))
+    }
+
+    fn len(&self) -> usize {
+        VariableList::len(self)
+    }
+
+    fn is_empty(&self) -> bool {
+        VariableList::is_empty(self)
+    }
+
+    fn blobs(&self) -> Option<&BlobsList<T>> {
+        None
+    }
+}
+
+impl<E: EthSpec> Sidecar<E> for BlobSidecar<E> {
+    type BlobItems = BlobsList<E>;
+
+    fn slot(&self) -> Slot {
+        self.slot
+    }
+
+    fn build_sidecar<Payload: AbstractExecPayload<E>>(
+        blobs: BlobsList<E>,
+        block: &BeaconBlock<E, Payload>,
+        expected_kzg_commitments: &BuilderKzgCommitments<E>,
+        kzg_proofs: Vec<KzgProof>,
+    ) -> Result<SidecarList<E, Self>, String> {
+        let beacon_block_root = block.canonical_root();
+        let slot = block.slot();
+        let blob_sidecars = BlobSidecarList::from(
+            blobs
+                .into_iter()
+                .enumerate()
+                .map(|(blob_index, blob)| {
+                    let kzg_commitment = expected_kzg_commitments
+                        .get(blob_index)
+                        .ok_or("KZG commitment should exist for blob")?;
+
+                    let kzg_proof = kzg_proofs
+                        .get(blob_index)
+                        .ok_or("KZG proof should exist for blob")?;
+
+                    Ok(Arc::new(BlobSidecar {
+                        block_root: beacon_block_root,
+                        index: blob_index as u64,
+                        slot,
+                        block_parent_root: block.parent_root(),
+                        proposer_index: block.proposer_index(),
+                        blob,
+                        kzg_commitment: *kzg_commitment,
+                        kzg_proof: *kzg_proof,
+                    }))
+                })
+                .collect::<Result<Vec<_>, String>>()?,
+        );
+
+        Ok(blob_sidecars)
+    }
+}
+
+impl<E: EthSpec> Sidecar<E> for BlindedBlobSidecar {
+    type BlobItems = BlobRootsList<E>;
+
+    fn slot(&self) -> Slot {
+        self.slot
+    }
+
+    fn build_sidecar<Payload: AbstractExecPayload<E>>(
+        blob_roots: BlobRootsList<E>,
+        block: &BeaconBlock<E, Payload>,
+        expected_kzg_commitments: &BuilderKzgCommitments<E>,
+        kzg_proofs: Vec<KzgProof>,
+    ) -> Result<SidecarList<E, BlindedBlobSidecar>, String> {
+        let beacon_block_root = block.canonical_root();
+        let slot = block.slot();
+
+        let blob_sidecars = BlindedBlobSidecarList::<E>::from(
+            blob_roots
+                .into_iter()
+                .enumerate()
+                .map(|(blob_index, blob_root)| {
+                    let kzg_commitment = expected_kzg_commitments
+                        .get(blob_index)
+                        .ok_or("KZG commitment should exist for blob")?;
+
+                    let kzg_proof = kzg_proofs.get(blob_index).ok_or(format!(
+                        "Missing KZG proof for slot {} blob index: {}",
+                        slot, blob_index
+                    ))?;
+
+                    Ok(Arc::new(BlindedBlobSidecar {
+                        block_root: beacon_block_root,
+                        index: blob_index as u64,
+                        slot,
+                        block_parent_root: block.parent_root(),
+                        proposer_index: block.proposer_index(),
+                        blob_root,
+                        kzg_commitment: *kzg_commitment,
+                        kzg_proof: *kzg_proof,
+                    }))
+                })
+                .collect::<Result<Vec<_>, String>>()?,
+        );
+
+        Ok(blob_sidecars)
+    }
+}
diff --git a/consensus/types/src/signed_blob.rs b/consensus/types/src/signed_blob.rs
index ff3daa29ac..e960558a3e 100644
--- a/consensus/types/src/signed_blob.rs
+++ b/consensus/types/src/signed_blob.rs
@@ -1,6 +1,7 @@
+use crate::sidecar::Sidecar;
 use crate::{
     test_utils::TestRandom, BlindedBlobSidecar, Blob, BlobSidecar, ChainSpec, Domain, EthSpec,
-    Fork, Hash256, Sidecar, Signature, SignedRoot, SigningData,
+    Fork, Hash256, Signature, SignedRoot, SigningData,
 };
 use bls::PublicKey;
 use derivative::Derivative;
diff --git a/database_manager/src/lib.rs b/database_manager/src/lib.rs
index 2428fa5262..184ba69438 100644
--- a/database_manager/src/lib.rs
+++ b/database_manager/src/lib.rs
@@ -107,6 +107,7 @@ pub fn cli_app<'a, 'b>() -> App<'a, 'b> {
         .arg(
             Arg::with_name("blob-prune-margin-epochs")
                 .long("blob-prune-margin-epochs")
+                .value_name("EPOCHS")
                 .help(
                     "The margin for blob pruning in epochs. The oldest blobs are pruned \
                        up until data_availability_boundary - blob_prune_margin_epochs.",
diff --git a/testing/ef_tests/check_all_files_accessed.py b/testing/ef_tests/check_all_files_accessed.py
index 7c30029f38..a5ab897c33 100755
--- a/testing/ef_tests/check_all_files_accessed.py
+++ b/testing/ef_tests/check_all_files_accessed.py
@@ -51,9 +51,6 @@ excluded_paths = [
     "bls12-381-tests/deserialization_G1",
     "bls12-381-tests/deserialization_G2",
     "bls12-381-tests/hash_to_G2",
-    # FIXME(sean)
-    "tests/mainnet/capella/light_client/single_merkle_proof/BeaconBlockBody/*",
-    "tests/mainnet/deneb/light_client/single_merkle_proof/BeaconBlockBody/*",
     "tests/.*/eip6110"
 ]
 
diff --git a/validator_client/src/validator_store.rs b/validator_client/src/validator_store.rs
index ffe7fd0832..612dd96bcd 100644
--- a/validator_client/src/validator_store.rs
+++ b/validator_client/src/validator_store.rs
@@ -18,11 +18,12 @@ use std::marker::PhantomData;
 use std::path::Path;
 use std::sync::Arc;
 use task_executor::TaskExecutor;
+use types::sidecar::Sidecar;
 use types::{
     attestation::Error as AttestationError, graffiti::GraffitiString, AbstractExecPayload, Address,
     AggregateAndProof, Attestation, BeaconBlock, BlindedPayload, ChainSpec, ContributionAndProof,
     Domain, Epoch, EthSpec, Fork, ForkName, Graffiti, Hash256, Keypair, PublicKeyBytes,
-    SelectionProof, Sidecar, SidecarList, Signature, SignedAggregateAndProof, SignedBeaconBlock,
+    SelectionProof, SidecarList, Signature, SignedAggregateAndProof, SignedBeaconBlock,
     SignedContributionAndProof, SignedRoot, SignedSidecar, SignedSidecarList,
     SignedValidatorRegistrationData, SignedVoluntaryExit, Slot, SyncAggregatorSelectionData,
     SyncCommitteeContribution, SyncCommitteeMessage, SyncSelectionProof, SyncSubnetId,