Gloas publish data columns during local block building (#9182)

Make sure we are publishing columns during local block production


  


Co-Authored-By: Eitan Seri-Levi <eserilev@ucsc.edu>

Co-Authored-By: dapplion <35266934+dapplion@users.noreply.github.com>

beacon_node/beacon_chain/src/block_production/gloas.rs

@@ -35,6 +35,7 @@ use types::{
     SignedVoluntaryExit, Slot, SyncAggregate, Withdrawal, Withdrawals,
 };
 
+use crate::pending_payload_envelopes::PendingEnvelopeData;
 use crate::{
     BeaconChain, BeaconChainError, BeaconChainTypes, BlockProductionError,
     ProduceBlockVerification, block_production::BlockProductionState,
@@ -74,6 +75,7 @@ pub struct ExecutionPayloadData<E: types::EthSpec> {
     pub execution_requests: ExecutionRequests<E>,
     pub builder_index: BuilderIndex,
     pub slot: Slot,
+    pub blobs_and_proofs: (types::BlobsList<E>, types::KzgProofs<E>),
 }
 
 impl<T: BeaconChainTypes> BeaconChain<T> {
@@ -647,9 +649,14 @@ impl<T: BeaconChainTypes> BeaconChain<T> {
             let envelope_slot = payload_data.slot;
             // TODO(gloas) might be safer to cache by root instead of by slot.
             // We should revisit this once this code path + beacon api spec matures
-            self.pending_payload_envelopes
+            let (blobs, _) = payload_data.blobs_and_proofs;
-                .write()
+            self.pending_payload_envelopes.write().insert(
-                .insert(envelope_slot, signed_envelope.message);
+                envelope_slot,
+                PendingEnvelopeData {
+                    envelope: signed_envelope.message,
+                    blobs: Some(blobs),
+                },
+            );
 
             debug!(
                 %beacon_block_root,
@@ -769,7 +776,7 @@ impl<T: BeaconChainTypes> BeaconChain<T> {
             payload_value: _,
             execution_requests,
             blob_kzg_commitments,
-            blobs_and_proofs: _,
+            blobs_and_proofs,
         } = block_proposal_contents;
 
         // TODO(gloas) since we are defaulting to local building, execution payment is 0
@@ -795,6 +802,7 @@ impl<T: BeaconChainTypes> BeaconChain<T> {
             execution_requests,
             builder_index,
             slot: produce_at_slot,
+            blobs_and_proofs,
         };
 
         // TODO(gloas) this is only local building

beacon_node/beacon_chain/src/kzg_utils.rs

@@ -296,6 +296,35 @@ pub fn blobs_to_data_column_sidecars<E: EthSpec>(
     }
 }
 
+/// Build Gloas data column sidecars from blobs, computing cells and proofs locally.
+pub fn blobs_to_data_column_sidecars_gloas<E: EthSpec>(
+    blobs: &[&Blob<E>],
+    beacon_block_root: Hash256,
+    slot: Slot,
+    kzg: &Kzg,
+    spec: &ChainSpec,
+) -> Result<DataColumnSidecarList<E>, DataColumnSidecarError> {
+    if blobs.is_empty() {
+        return Ok(vec![]);
+    }
+
+    let blob_cells_and_proofs_vec = blobs
+        .into_par_iter()
+        .map(|blob| {
+            let blob = blob.as_ref().try_into().map_err(|e| {
+                KzgError::InconsistentArrayLength(format!(
+                    "blob should have a guaranteed size due to FixedVector: {e:?}"
+                ))
+            })?;
+
+            kzg.compute_cells_and_proofs(blob)
+        })
+        .collect::<Result<Vec<_>, KzgError>>()?;
+
+    build_data_column_sidecars_gloas(beacon_block_root, slot, blob_cells_and_proofs_vec, spec)
+        .map_err(DataColumnSidecarError::BuildSidecarFailed)
+}
+
 /// Build data column sidecars from a signed beacon block and its blobs.
 #[instrument(skip_all, level = "debug", fields(blob_count = blobs_and_proofs.len()))]
 pub fn blobs_to_partial_data_columns<E: EthSpec>(
@@ -728,8 +757,8 @@ pub fn reconstruct_data_columns<E: EthSpec>(
 #[cfg(test)]
 mod test {
     use crate::kzg_utils::{
-        blobs_to_data_column_sidecars, reconstruct_blobs, reconstruct_data_columns,
+        blobs_to_data_column_sidecars, blobs_to_data_column_sidecars_gloas, reconstruct_blobs,
-        validate_full_data_columns,
+        reconstruct_data_columns, validate_full_data_columns,
     };
     use bls::Signature;
     use eth2::types::BlobsBundle;
@@ -737,25 +766,30 @@ mod test {
     use kzg::{Kzg, KzgCommitment, trusted_setup::get_trusted_setup};
     use types::{
         BeaconBlock, BeaconBlockFulu, BlobsList, ChainSpec, EmptyBlock, EthSpec, ForkName,
-        FullPayload, KzgProofs, MainnetEthSpec, SignedBeaconBlock, kzg_ext::KzgCommitments,
+        FullPayload, Hash256, KzgProofs, MainnetEthSpec, SignedBeaconBlock, Slot,
+        kzg_ext::KzgCommitments,
     };
 
     type E = MainnetEthSpec;
 
     // Loading and initializing PeerDAS KZG is expensive and slow, so we group the tests together
     // only load it once.
-    // TODO(Gloas) make this generic over fulu/gloas, or write a separate function for Gloas
     #[test]
     fn test_build_data_columns_sidecars() {
-        let spec = ForkName::Fulu.make_genesis_spec(E::default_spec());
         let kzg = get_kzg();
-        test_build_data_columns_empty(&kzg, &spec);
+
-        test_build_data_columns_fulu(&kzg, &spec);
+        let fulu_spec = ForkName::Fulu.make_genesis_spec(E::default_spec());
-        test_reconstruct_data_columns(&kzg, &spec);
+        test_build_data_columns_empty(&kzg, &fulu_spec);
-        test_reconstruct_data_columns_unordered(&kzg, &spec);
+        test_build_data_columns_fulu(&kzg, &fulu_spec);
-        test_reconstruct_blobs_from_data_columns(&kzg, &spec);
+        test_reconstruct_data_columns(&kzg, &fulu_spec);
-        test_reconstruct_blobs_from_data_columns_unordered(&kzg, &spec);
+        test_reconstruct_data_columns_unordered(&kzg, &fulu_spec);
-        test_validate_data_columns(&kzg, &spec);
+        test_reconstruct_blobs_from_data_columns(&kzg, &fulu_spec);
+        test_reconstruct_blobs_from_data_columns_unordered(&kzg, &fulu_spec);
+        test_validate_data_columns(&kzg, &fulu_spec);
+
+        let gloas_spec = ForkName::Gloas.make_genesis_spec(E::default_spec());
+        test_build_data_columns_gloas(&kzg, &gloas_spec);
+        test_build_data_columns_gloas_empty(&kzg, &gloas_spec);
     }
 
     #[track_caller]
@@ -784,8 +818,49 @@ mod test {
         assert!(column_sidecars.is_empty());
     }
 
-    // TODO(gloas) create `test_build_data_columns_gloas` and make sure its called
+    #[track_caller]
-    // in the relevant places
+    fn test_build_data_columns_gloas(kzg: &Kzg, spec: &ChainSpec) {
+        let num_of_blobs = 2;
+        let (blobs, _proofs) = create_test_gloas_blobs::<E>(num_of_blobs);
+        let beacon_block_root = Hash256::random();
+        let slot = Slot::new(0);
+
+        let blob_refs: Vec<_> = blobs.iter().collect();
+        let column_sidecars = blobs_to_data_column_sidecars_gloas::<E>(
+            &blob_refs,
+            beacon_block_root,
+            slot,
+            kzg,
+            spec,
+        )
+        .unwrap();
+
+        assert_eq!(column_sidecars.len(), E::number_of_columns());
+        for (idx, col_sidecar) in column_sidecars.iter().enumerate() {
+            assert_eq!(*col_sidecar.index(), idx as u64);
+            assert_eq!(col_sidecar.column().len(), num_of_blobs);
+            assert_eq!(col_sidecar.kzg_proofs().len(), num_of_blobs);
+
+            let gloas_col = col_sidecar.as_gloas().expect("should be Gloas sidecar");
+            assert_eq!(gloas_col.beacon_block_root, beacon_block_root);
+            assert_eq!(gloas_col.slot, slot);
+        }
+    }
+
+    #[track_caller]
+    fn test_build_data_columns_gloas_empty(kzg: &Kzg, spec: &ChainSpec) {
+        let blob_refs: Vec<&types::Blob<E>> = vec![];
+        let column_sidecars = blobs_to_data_column_sidecars_gloas::<E>(
+            &blob_refs,
+            Hash256::random(),
+            Slot::new(0),
+            kzg,
+            spec,
+        )
+        .unwrap();
+        assert!(column_sidecars.is_empty());
+    }
+
     #[track_caller]
     fn test_build_data_columns_fulu(kzg: &Kzg, spec: &ChainSpec) {
         // Using at least 2 blobs to make sure we're arranging the data columns correctly.
@@ -974,4 +1049,9 @@ mod test {
 
         (signed_block, blobs, proofs)
     }
+
+    fn create_test_gloas_blobs<E: EthSpec>(num_of_blobs: usize) -> (BlobsList<E>, KzgProofs<E>) {
+        let (blobs_bundle, _) = generate_blobs::<E>(num_of_blobs, ForkName::Gloas).unwrap();
+        (blobs_bundle.blobs, blobs_bundle.proofs)
+    }
 }

beacon_node/beacon_chain/src/pending_payload_envelopes.rs

@@ -6,7 +6,12 @@
 //! and publishes the payload.
 
 use std::collections::HashMap;
-use types::{EthSpec, ExecutionPayloadEnvelope, Slot};
+use types::{BlobsList, EthSpec, ExecutionPayloadEnvelope, Slot};
+
+pub struct PendingEnvelopeData<E: EthSpec> {
+    pub envelope: ExecutionPayloadEnvelope<E>,
+    pub blobs: Option<BlobsList<E>>,
+}
 
 /// Cache for pending execution payload envelopes awaiting publishing.
 ///
@@ -16,7 +21,7 @@ pub struct PendingPayloadEnvelopes<E: EthSpec> {
     /// Maximum number of slots to keep envelopes before pruning.
     max_slot_age: u64,
     /// The envelopes, keyed by slot.
-    envelopes: HashMap<Slot, ExecutionPayloadEnvelope<E>>,
+    envelopes: HashMap<Slot, PendingEnvelopeData<E>>,
 }
 
 impl<E: EthSpec> Default for PendingPayloadEnvelopes<E> {
@@ -38,19 +43,24 @@ impl<E: EthSpec> PendingPayloadEnvelopes<E> {
     }
 
     /// Insert a pending envelope into the cache.
-    pub fn insert(&mut self, slot: Slot, envelope: ExecutionPayloadEnvelope<E>) {
+    pub fn insert(&mut self, slot: Slot, data: PendingEnvelopeData<E>) {
         // TODO(gloas): we may want to check for duplicates here, which shouldn't be allowed
-        self.envelopes.insert(slot, envelope);
+        self.envelopes.insert(slot, data);
     }
 
     /// Get a pending envelope by slot.
     pub fn get(&self, slot: Slot) -> Option<&ExecutionPayloadEnvelope<E>> {
-        self.envelopes.get(&slot)
+        self.envelopes.get(&slot).map(|d| &d.envelope)
+    }
+
+    /// Remove and return the blobs and proofs for a slot, leaving the envelope in place.
+    pub fn take_blobs(&mut self, slot: Slot) -> Option<BlobsList<E>> {
+        self.envelopes.get_mut(&slot).and_then(|d| d.blobs.take())
     }
 
     /// Remove and return a pending envelope by slot.
     pub fn remove(&mut self, slot: Slot) -> Option<ExecutionPayloadEnvelope<E>> {
-        self.envelopes.remove(&slot)
+        self.envelopes.remove(&slot).map(|d| d.envelope)
     }
 
     /// Check if an envelope exists for the given slot.
@@ -85,8 +95,9 @@ mod tests {
 
     type E = MainnetEthSpec;
 
-    fn make_envelope(slot: Slot) -> ExecutionPayloadEnvelope<E> {
+    fn make_envelope(slot: Slot) -> PendingEnvelopeData<E> {
-        ExecutionPayloadEnvelope {
+        PendingEnvelopeData {
+            envelope: ExecutionPayloadEnvelope {
                 payload: ExecutionPayloadGloas {
                     slot_number: slot,
                     ..ExecutionPayloadGloas::default()
@@ -94,6 +105,8 @@ mod tests {
                 execution_requests: ExecutionRequests::default(),
                 builder_index: 0,
                 beacon_block_root: Hash256::ZERO,
+            },
+            blobs: None,
         }
     }
 
@@ -101,33 +114,73 @@ mod tests {
     fn insert_and_get() {
         let mut cache = PendingPayloadEnvelopes::<E>::default();
         let slot = Slot::new(1);
-        let envelope = make_envelope(slot);
+        let data = make_envelope(slot);
+        let expected_envelope = data.envelope.clone();
 
         assert!(!cache.contains(slot));
         assert_eq!(cache.len(), 0);
 
-        cache.insert(slot, envelope.clone());
+        cache.insert(slot, data);
 
         assert!(cache.contains(slot));
         assert_eq!(cache.len(), 1);
-        assert_eq!(cache.get(slot), Some(&envelope));
+        assert_eq!(cache.get(slot), Some(&expected_envelope));
     }
 
     #[test]
     fn remove() {
         let mut cache = PendingPayloadEnvelopes::<E>::default();
         let slot = Slot::new(1);
-        let envelope = make_envelope(slot);
+        let data = make_envelope(slot);
+        let expected_envelope = data.envelope.clone();
 
-        cache.insert(slot, envelope.clone());
+        cache.insert(slot, data);
         assert!(cache.contains(slot));
 
         let removed = cache.remove(slot);
-        assert_eq!(removed, Some(envelope));
+        assert_eq!(removed, Some(expected_envelope));
         assert!(!cache.contains(slot));
         assert_eq!(cache.len(), 0);
     }
 
+    #[test]
+    fn take_blobs_returns_once() {
+        let mut cache = PendingPayloadEnvelopes::<E>::default();
+        let slot = Slot::new(1);
+
+        let blobs = BlobsList::<E>::default();
+        let data = PendingEnvelopeData {
+            envelope: make_envelope(slot).envelope,
+            blobs: Some(blobs),
+        };
+        cache.insert(slot, data);
+
+        // First take returns the blobs
+        let taken = cache.take_blobs(slot);
+        assert!(taken.is_some());
+
+        // Second take returns None — blobs are consumed
+        let taken_again = cache.take_blobs(slot);
+        assert!(taken_again.is_none());
+
+        // Envelope is still in the cache
+        assert!(cache.contains(slot));
+        assert!(cache.get(slot).is_some());
+    }
+
+    #[test]
+    fn take_blobs_returns_none_when_absent() {
+        let mut cache = PendingPayloadEnvelopes::<E>::default();
+        let slot = Slot::new(1);
+
+        // Insert with no blobs
+        cache.insert(slot, make_envelope(slot));
+        assert!(cache.take_blobs(slot).is_none());
+
+        // Non-existent slot
+        assert!(cache.take_blobs(Slot::new(99)).is_none());
+    }
+
     #[test]
     fn prune_old_envelopes() {
         let mut cache = PendingPayloadEnvelopes::<E>::new(2);

beacon_node/beacon_chain/src/test_utils.rs

@@ -86,6 +86,8 @@ pub const FORK_NAME_ENV_VAR: &str = "FORK_NAME";
 // `beacon_node/execution_layer/src/test_utils/fixtures/mainnet/test_blobs_bundle.ssz`
 pub const TEST_DATA_COLUMN_SIDECARS_SSZ: &[u8] =
     include_bytes!("test_utils/fixtures/test_data_column_sidecars.ssz");
+pub const TEST_DATA_COLUMN_SIDECARS_GLOAS_SSZ: &[u8] =
+    include_bytes!("test_utils/fixtures/test_data_column_sidecars_gloas.ssz");
 
 // Default target aggregators to set during testing, this ensures an aggregator at each slot.
 //
@@ -3789,24 +3791,24 @@ pub fn generate_data_column_sidecars_from_block<E: EthSpec>(
     block: &SignedBeaconBlock<E>,
     spec: &ChainSpec,
 ) -> DataColumnSidecarList<E> {
-    let kzg_commitments = block.message().body().blob_kzg_commitments().unwrap();
-    if kzg_commitments.is_empty() {
-        return vec![];
-    }
-
-    let kzg_commitments_inclusion_proof = block
-        .message()
-        .body()
-        .kzg_commitments_merkle_proof()
-        .unwrap();
-    let signed_block_header = block.signed_block_header();
-
     // Load the precomputed column sidecar to avoid computing them for every block in the tests.
     // Then repeat the cells and proofs for every blob
     if block.fork_name_unchecked().gloas_enabled() {
+        let kzg_commitments = &block
+            .message()
+            .body()
+            .signed_execution_payload_bid()
+            .expect("Gloas block should have a payload bid")
+            .message
+            .blob_kzg_commitments;
+        if kzg_commitments.is_empty() {
+            return vec![];
+        }
+        let num_blobs = kzg_commitments.len();
+        let signed_block_header = block.signed_block_header();
         let template_data_columns =
             RuntimeVariableList::<DataColumnSidecarGloas<E>>::from_ssz_bytes(
-                TEST_DATA_COLUMN_SIDECARS_SSZ,
+                TEST_DATA_COLUMN_SIDECARS_GLOAS_SSZ,
                 E::number_of_columns(),
             )
             .unwrap();
@@ -3826,7 +3828,7 @@ pub fn generate_data_column_sidecars_from_block<E: EthSpec>(
             .collect::<(Vec<_>, Vec<_>)>();
 
         let blob_cells_and_proofs_vec =
-            vec![(cells.try_into().unwrap(), proofs.try_into().unwrap()); kzg_commitments.len()];
+            vec![(cells.try_into().unwrap(), proofs.try_into().unwrap()); num_blobs];
 
         build_data_column_sidecars_gloas(
             signed_block_header.message.tree_hash_root(),
@@ -3836,6 +3838,18 @@ pub fn generate_data_column_sidecars_from_block<E: EthSpec>(
         )
         .unwrap()
     } else {
+        let kzg_commitments = block.message().body().blob_kzg_commitments().unwrap();
+        if kzg_commitments.is_empty() {
+            return vec![];
+        }
+
+        let kzg_commitments_inclusion_proof = block
+            .message()
+            .body()
+            .kzg_commitments_merkle_proof()
+            .unwrap();
+        let signed_block_header = block.signed_block_header();
+
         // load the precomputed column sidecar to avoid computing them for every block in the tests.
         let template_data_columns =
             RuntimeVariableList::<DataColumnSidecarFulu<E>>::from_ssz_bytes(

beacon_node/beacon_chain/tests/column_verification.rs

@@ -115,6 +115,78 @@ async fn rpc_columns_with_invalid_header_signature() {
     ));
 }
 
+/// Test that Gloas block production caches blobs alongside the envelope, and that
+/// data columns can be built from those cached blobs.
+#[tokio::test]
+async fn gloas_envelope_blobs_produce_valid_columns() {
+    let spec = Arc::new(test_spec::<E>());
+    if !spec.is_gloas_scheduled() {
+        return;
+    }
+
+    let harness = get_harness(VALIDATOR_COUNT, spec.clone(), NodeCustodyType::Supernode);
+    harness.execution_block_generator().set_min_blob_count(1);
+
+    // Build some chain depth.
+    let num_blocks = E::slots_per_epoch() as usize;
+    harness
+        .extend_chain(
+            num_blocks,
+            BlockStrategy::OnCanonicalHead,
+            AttestationStrategy::AllValidators,
+        )
+        .await;
+
+    harness.advance_slot();
+    let slot = harness.get_current_slot();
+
+    // Produce a Gloas block via the harness. This caches envelope + blobs.
+    let state = harness.get_current_state();
+    let (block_contents, opt_envelope, _post_state) =
+        harness.make_block_with_envelope(state, slot).await;
+    let signed_block = &block_contents.0;
+
+    assert!(
+        opt_envelope.is_some(),
+        "Gloas block production should produce an envelope"
+    );
+
+    // Verify the block has blob commitments in the bid.
+    let bid = signed_block
+        .message()
+        .body()
+        .signed_execution_payload_bid()
+        .expect("Gloas block should have a payload bid");
+    assert!(
+        !bid.message.blob_kzg_commitments.is_empty(),
+        "Block should have blob KZG commitments"
+    );
+
+    // Generate data columns from the block (using test fixtures, same as the harness does).
+    let data_column_sidecars =
+        generate_data_column_sidecars_from_block(signed_block, &harness.chain.spec);
+    assert_eq!(
+        data_column_sidecars.len(),
+        E::number_of_columns(),
+        "Should produce the correct number of data columns"
+    );
+
+    // Verify all columns are Gloas-format.
+    for col in &data_column_sidecars {
+        assert!(
+            col.as_gloas().is_ok(),
+            "Data column sidecar should be Gloas variant"
+        );
+        let gloas_col = col.as_gloas().expect("should be Gloas sidecar");
+        assert_eq!(gloas_col.beacon_block_root, signed_block.canonical_root());
+        assert_eq!(gloas_col.slot, slot);
+    }
+
+    // End-to-end DA flow (process_block → process_envelope → process_rpc_custody_columns)
+    // is not exercised here: Gloas blocks are not gated on columns at block-import time
+    // and the envelope/column gating belongs in a dedicated test once the DA path matures.
+}
+
 // Regression test for verify_header_signature bug: it uses head_fork() which is wrong for fork blocks
 #[tokio::test]
 async fn verify_header_signature_fork_block_bug() {

beacon_node/beacon_chain/tests/prepare_payload.rs

@@ -573,3 +573,121 @@ async fn prepare_payload_on_fork_boundary(
          advanced state"
     );
 }
+
+#[tokio::test]
+async fn gloas_block_production_caches_blobs_for_column_publishing() {
+    use beacon_chain::ProduceBlockVerification;
+    use beacon_chain::graffiti_calculator::GraffitiSettings;
+    use eth2::types::GraffitiPolicy;
+
+    let spec = Arc::new(test_spec::<E>());
+    if !spec.fork_name_at_slot::<E>(Slot::new(0)).gloas_enabled() {
+        return;
+    }
+
+    let db_path = tempdir().unwrap();
+    let store = get_store(&db_path, spec.clone());
+    let harness = get_harness(store.clone(), LOW_VALIDATOR_COUNT);
+
+    // Configure the mock EL to produce at least 1 blob per block.
+    harness.execution_block_generator().set_min_blob_count(1);
+
+    // Extend the chain a few slots to get past genesis.
+    harness
+        .extend_chain(
+            (E::slots_per_epoch() as usize) + 1,
+            BlockStrategy::OnCanonicalHead,
+            AttestationStrategy::AllValidators,
+        )
+        .await;
+
+    harness.advance_slot();
+    let slot = harness.get_current_slot();
+
+    // Produce a Gloas block directly via produce_block_on_state_gloas so we can
+    // inspect the pending cache before it's consumed.
+    let mut state = harness.get_current_state();
+    complete_state_advance(&mut state, None, slot, &spec).unwrap();
+    state.build_caches(&spec).unwrap();
+
+    let proposer_index = state.get_beacon_proposer_index(slot, &spec).unwrap();
+    let randao_reveal = harness.sign_randao_reveal(&state, proposer_index, slot);
+
+    let (parent_payload_status, parent_envelope) = {
+        let head = harness.chain.canonical_head.cached_head();
+        (
+            head.head_payload_status(),
+            head.snapshot.execution_envelope.clone(),
+        )
+    };
+
+    let graffiti_settings = GraffitiSettings::new(
+        Some(Graffiti::default()),
+        Some(GraffitiPolicy::PreserveUserGraffiti),
+    );
+
+    let (_block, _post_state, _value) = harness
+        .chain
+        .produce_block_on_state_gloas(
+            state,
+            None,
+            parent_payload_status,
+            parent_envelope,
+            slot,
+            randao_reveal,
+            graffiti_settings,
+            ProduceBlockVerification::VerifyRandao,
+        )
+        .await
+        .unwrap();
+
+    // The envelope + blobs should now be in the pending cache.
+    assert!(
+        harness
+            .chain
+            .pending_payload_envelopes
+            .read()
+            .contains(slot),
+        "Pending cache should contain an envelope for the produced slot"
+    );
+
+    // Take the blobs from the cache — this is what publish_execution_payload_envelope does.
+    let blobs = harness
+        .chain
+        .pending_payload_envelopes
+        .write()
+        .take_blobs(slot);
+
+    assert!(
+        blobs.is_some(),
+        "Blobs should be cached alongside the envelope"
+    );
+
+    let blobs = blobs.unwrap();
+    assert!(
+        !blobs.is_empty(),
+        "Blobs should be non-empty when min_blob_count >= 1"
+    );
+
+    // Verify take_blobs is consume-once.
+    let second_take = harness
+        .chain
+        .pending_payload_envelopes
+        .write()
+        .take_blobs(slot);
+    assert!(
+        second_take.is_none(),
+        "Blobs should only be consumable once"
+    );
+
+    // The envelope should still be in the cache after taking blobs.
+    assert!(
+        harness
+            .chain
+            .pending_payload_envelopes
+            .read()
+            .get(slot)
+            .is_some(),
+        "Envelope should remain in cache after taking blobs"
+    );
+}

beacon_node/http_api/src/beacon/execution_payload_envelope.rs

@@ -1,10 +1,12 @@
 use crate::block_id::BlockId;
+use crate::publish_blocks::publish_column_sidecars;
 use crate::task_spawner::{Priority, TaskSpawner};
 use crate::utils::{ChainFilter, EthV1Filter, NetworkTxFilter, ResponseFilter, TaskSpawnerFilter};
 use crate::version::{
     ResponseIncludesVersion, add_consensus_version_header, add_ssz_content_type_header,
     execution_optimistic_finalized_beacon_response,
 };
+use beacon_chain::data_column_verification::{GossipDataColumnError, GossipVerifiedDataColumn};
 use beacon_chain::{BeaconChain, BeaconChainTypes};
 use bytes::Bytes;
 use eth2::types as api_types;
@@ -12,10 +14,11 @@ use eth2::{CONTENT_TYPE_HEADER, SSZ_CONTENT_TYPE_HEADER};
 use lighthouse_network::PubsubMessage;
 use network::NetworkMessage;
 use ssz::{Decode, Encode};
+use std::future::Future;
 use std::sync::Arc;
 use tokio::sync::mpsc::UnboundedSender;
-use tracing::{info, warn};
+use tracing::{debug, error, info, warn};
-use types::SignedExecutionPayloadEnvelope;
+use types::{EthSpec, SignedExecutionPayloadEnvelope};
 use warp::{
     Filter, Rejection, Reply,
     hyper::{Body, Response},
@@ -85,7 +88,9 @@ pub(crate) fn post_beacon_execution_payload_envelope<T: BeaconChainTypes>(
         )
         .boxed()
 }
-/// Publishes a signed execution payload envelope to the network.
+/// Publishes a signed execution payload envelope to the network. Implements
+/// `POST /eth/v1/beacon/execution_payload_envelope` per the in-flight beacon-APIs PR
+/// <https://github.com/ethereum/beacon-APIs/pull/580>.
 pub async fn publish_execution_payload_envelope<T: BeaconChainTypes>(
     envelope: SignedExecutionPayloadEnvelope<T::EthSpec>,
     chain: Arc<BeaconChain<T>>,
@@ -109,7 +114,24 @@ pub async fn publish_execution_payload_envelope<T: BeaconChainTypes>(
         "Publishing signed execution payload envelope to network"
     );
 
-    // Publish to the network
+    let blobs_and_proofs = chain.pending_payload_envelopes.write().take_blobs(slot);
+
+    // Spawn the column-build task (CPU-bound KZG cell-and-proof computation) before
+    // publishing the envelope so it runs in parallel with envelope gossip, narrowing
+    // the window in which peers see envelope-without-columns. If envelope publication
+    // fails below, dropping this future drops the spawned `JoinHandle` (the running
+    // closure on the blocking pool finishes and is then discarded — no work cancellation).
+    let column_build_future = match blobs_and_proofs {
+        Some(blobs) if !blobs.is_empty() => Some(spawn_build_gloas_data_columns_task(
+            &chain,
+            beacon_block_root,
+            slot,
+            blobs,
+        )?),
+        _ => None,
+    };
+
+    // Publish the envelope to the network.
     crate::utils::publish_pubsub_message(
         network_tx,
         PubsubMessage::ExecutionPayload(Box::new(envelope)),
@@ -121,9 +143,130 @@ pub async fn publish_execution_payload_envelope<T: BeaconChainTypes>(
         )
     })?;
 
+    // From here on the envelope is on the wire. `take_blobs` already consumed the cache
+    // entry, so a retry would not republish columns; returning Err would mislead the
+    // caller. Log column-build/publish failures and fall through to `Ok`.
+    if let Some(column_build_future) = column_build_future {
+        let gossip_verified_columns = match column_build_future.await {
+            Ok(columns) => columns,
+            Err(e) => {
+                error!(
+                    %slot,
+                    error = ?e,
+                    "Failed to build data columns after envelope publication"
+                );
+                return Ok(warp::reply().into_response());
+            }
+        };
+
+        if !gossip_verified_columns.is_empty() {
+            if let Err(e) = publish_column_sidecars(network_tx, &gossip_verified_columns, &chain) {
+                error!(
+                    %slot,
+                    error = ?e,
+                    "Failed to publish data column sidecars after envelope publication"
+                );
+                return Ok(warp::reply().into_response());
+            }
+
+            let epoch = slot.epoch(T::EthSpec::slots_per_epoch());
+            let sampling_column_indices = chain.sampling_columns_for_epoch(epoch);
+            let sampling_columns = gossip_verified_columns
+                .into_iter()
+                .filter(|col| sampling_column_indices.contains(&col.index()))
+                .collect::<Vec<_>>();
+
+            // Local processing only — envelope already broadcast, so log and fall through.
+            if !sampling_columns.is_empty()
+                && let Err(e) =
+                    Box::pin(chain.process_gossip_data_columns(sampling_columns, || Ok(()))).await
+            {
+                error!(
+                    %slot,
+                    error = ?e,
+                    "Failed to process sampling data columns during envelope publication"
+                );
+            }
+        }
+    }
+
     Ok(warp::reply().into_response())
 }
 
+fn spawn_build_gloas_data_columns_task<T: BeaconChainTypes>(
+    chain: &Arc<BeaconChain<T>>,
+    beacon_block_root: types::Hash256,
+    slot: types::Slot,
+    blobs: types::BlobsList<T::EthSpec>,
+) -> Result<impl Future<Output = Result<Vec<GossipVerifiedDataColumn<T>>, Rejection>>, Rejection> {
+    let chain_for_build = chain.clone();
+    let handle = chain
+        .task_executor
+        .spawn_blocking_handle(
+            move || build_gloas_data_columns(&chain_for_build, beacon_block_root, slot, &blobs),
+            "build_gloas_data_columns",
+        )
+        .ok_or_else(|| warp_utils::reject::custom_server_error("runtime shutdown".to_string()))?;
+
+    Ok(async move {
+        handle
+            .await
+            .map_err(|_| warp_utils::reject::custom_server_error("join error".to_string()))?
+    })
+}
+
+fn build_gloas_data_columns<T: BeaconChainTypes>(
+    chain: &BeaconChain<T>,
+    beacon_block_root: types::Hash256,
+    slot: types::Slot,
+    blobs: &types::BlobsList<T::EthSpec>,
+) -> Result<Vec<GossipVerifiedDataColumn<T>>, Rejection> {
+    let blob_refs: Vec<_> = blobs.iter().collect();
+    let data_column_sidecars = beacon_chain::kzg_utils::blobs_to_data_column_sidecars_gloas(
+        &blob_refs,
+        beacon_block_root,
+        slot,
+        &chain.kzg,
+        &chain.spec,
+    )
+    .map_err(|e| {
+        error!(
+            error = ?e,
+            %slot,
+            "Failed to build data column sidecars for envelope"
+        );
+        warp_utils::reject::custom_server_error(format!("{e:?}"))
+    })?;
+
+    let gossip_verified_columns = data_column_sidecars
+        .into_iter()
+        .filter_map(|col| {
+            let index = *col.index();
+            match GossipVerifiedDataColumn::new_for_block_publishing(col, chain) {
+                Ok(verified) => Some(verified),
+                Err(GossipDataColumnError::PriorKnownUnpublished) => None,
+                Err(e) => {
+                    warn!(
+                        %slot,
+                        column_index = index,
+                        error = ?e,
+                        "Locally-built data column failed gossip verification"
+                    );
+                    None
+                }
+            }
+        })
+        .collect::<Vec<_>>();
+
+    debug!(
+        %slot,
+        column_count = gossip_verified_columns.len(),
+        "Built data columns for envelope publication"
+    );
+
+    Ok(gossip_verified_columns)
+}
+
 // TODO(gloas): add tests for this endpoint once we support importing payloads into the db
 // GET beacon/execution_payload_envelope/{block_id}
 pub(crate) fn get_beacon_execution_payload_envelope<T: BeaconChainTypes>(

beacon_node/http_api/src/publish_blocks.rs

@@ -494,7 +494,7 @@ fn publish_blob_sidecars<T: BeaconChainTypes>(
         .map_err(|_| BlockError::BeaconChainError(Box::new(BeaconChainError::UnableToPublish)))
 }
 
-fn publish_column_sidecars<T: BeaconChainTypes>(
+pub(crate) fn publish_column_sidecars<T: BeaconChainTypes>(
     sender_clone: &UnboundedSender<NetworkMessage<T::EthSpec>>,
     data_column_sidecars: &[GossipVerifiedDataColumn<T>],
     chain: &BeaconChain<T>,