EIP4844: crypto stubs

* boilerplate for block&block-by-root->blob-by-root

* add db interface to service and use in handler

* rm unused requestBlockAndSidecarByRoot

* add test for base case of sidecar by root

* test blob slot < min req epoch, other fixes

* cleaning up test mess

* rm unused func

* add BroadcastBlob method stubs to fix build

* handler name consistent with path

* initialize blob queue for test

* lint & gaz

* update mock to satisfy interface

* fix wrong sig for mock

* clean up min req epoch, no underflow, + tests

---------

Co-authored-by: kasey <kasey@users.noreply.github.com>

.golangci.yml

@@ -21,7 +21,7 @@ linters:
 linters-settings:
   gocognit:
     # TODO: We should target for < 50
-    min-complexity: 65
+    min-complexity: 69
 
 output:
   print-issued-lines: true

api/client/beacon/client.go

@@ -483,7 +483,7 @@ func (fsr *forkScheduleResponse) OrderedForkSchedule() (forks.OrderedSchedule, e
 		version := bytesutil.ToBytes4(vSlice)
 		ofs = append(ofs, forks.ForkScheduleEntry{
 			Version: version,
-			Epoch:   primitives.Epoch(uint64(epoch)),
+			Epoch:   primitives.Epoch(epoch),
 		})
 	}
 	sort.Sort(ofs)

beacon-chain/blockchain/execution_engine.go

@@ -301,7 +301,7 @@ func (s *Service) getPayloadAttribute(ctx context.Context, st state.BeaconState,
 
 	var attr payloadattribute.Attributer
 	switch st.Version() {
-	case version.Capella:
+	case version.Capella, version.Deneb:
 		withdrawals, err := st.ExpectedWithdrawals()
 		if err != nil {
 			log.WithError(err).Error("Could not get expected withdrawals to get payload attribute")

beacon-chain/blockchain/log.go

@@ -60,7 +60,13 @@ func logStateTransitionData(b interfaces.ReadOnlyBeaconBlock) error {
 			log = log.WithField("txCount", len(txs))
 			txsPerSlotCount.Set(float64(len(txs)))
 		}
-
+	}
+	if b.Version() >= version.Deneb {
+		k, err := b.Body().BlobKzgCommitments()
+		if err != nil {
+			return err
+		}
+		log = log.WithField("blobCount", len(k))
 	}
 	log.Info("Finished applying state transition")
 	return nil
@@ -96,6 +102,7 @@ func logBlockSyncStatus(block interfaces.ReadOnlyBeaconBlock, blockRoot [32]byte
 			"finalizedEpoch": finalized.Epoch,
 			"finalizedRoot":  fmt.Sprintf("0x%s...", hex.EncodeToString(finalized.Root)[:8]),
 			"epoch":          slots.ToEpoch(block.Slot()),
+			"version":        version.String(block.Version()),
 		}).Info("Synced new block")
 	}
 	return nil

beacon-chain/blockchain/process_block.go

@@ -715,3 +715,39 @@ func (s *Service) fillMissingBlockPayloadId(ctx context.Context) error {
 	})
 	return err
 }
+
+// validateBlobs validates the blobs with the kzg commitments in block.
+// Spec code:
+// def validate_blobs(expected_kzg_commitments: Sequence[KZGCommitment],
+//
+//	               blobs: Sequence[Blob],
+//	               proofs: Sequence[KZGProof]) -> None:
+//	assert len(expected_kzg_commitments) == len(blobs)
+//	assert len(blobs) == len(proofs)
+//
+//	assert verify_blob_kzg_proof_batch(blobs, expected_kzg_commitments, proofs)
+func (s *Service) validateBlobs(ctx context.Context, blk interfaces.ReadOnlyBeaconBlock) error {
+	if blk.Version() < version.Deneb {
+		return nil
+	}
+	comms, err := blk.Body().BlobKzgCommitments()
+	if err != nil {
+		return err
+	}
+	if len(comms) == 0 {
+		return nil
+	}
+	scs, err := s.cfg.BeaconDB.BlobSidecarsBySlot(ctx, blk.Slot()) // Also can use ByRoot here.
+	if err != nil {
+		return err
+	}
+	if len(scs.Sidecars) != len(comms) {
+		return fmt.Errorf("number of sidecars %d does not match number of commitments %d", len(scs.Sidecars), len(comms))
+	}
+	proofs := make([][]byte, len(comms))
+	for i, sc := range scs.Sidecars {
+		proofs[i] = sc.KzgProof
+	}
+	// TODO(Potuz):  assert verify_blob_kzg_proof_batch(blobs, expected_kzg_commitments, proofs)
+	return nil
+}

beacon-chain/blockchain/service_test.go

@@ -57,6 +57,11 @@ type mockBroadcaster struct {
 	broadcastCalled bool
 }
 
+func (mb *mockBroadcaster) BroadcastBlob(ctx context.Context, subnet uint64, blobSidecar *ethpb.SignedBlobSidecar) error {
+	//TODO implement me
+	panic("implement me")
+}
+
 func (mb *mockBroadcaster) Broadcast(_ context.Context, _ proto.Message) error {
 	mb.broadcastCalled = true
 	return nil

beacon-chain/core/capella/upgrade.go

@@ -9,6 +9,110 @@ import (
 	ethpb "github.com/prysmaticlabs/prysm/v4/proto/prysm/v1alpha1"
 )
 
+// UpgradeToDeneb updates inputs a generic state to return the version Deneb state.
+func UpgradeToDeneb(state state.BeaconState) (state.BeaconState, error) {
+	epoch := time.CurrentEpoch(state)
+
+	currentSyncCommittee, err := state.CurrentSyncCommittee()
+	if err != nil {
+		return nil, err
+	}
+	nextSyncCommittee, err := state.NextSyncCommittee()
+	if err != nil {
+		return nil, err
+	}
+	prevEpochParticipation, err := state.PreviousEpochParticipation()
+	if err != nil {
+		return nil, err
+	}
+	currentEpochParticipation, err := state.CurrentEpochParticipation()
+	if err != nil {
+		return nil, err
+	}
+	inactivityScores, err := state.InactivityScores()
+	if err != nil {
+		return nil, err
+	}
+	payloadHeader, err := state.LatestExecutionPayloadHeader()
+	if err != nil {
+		return nil, err
+	}
+	txRoot, err := payloadHeader.TransactionsRoot()
+	if err != nil {
+		return nil, err
+	}
+	wdRoot, err := payloadHeader.WithdrawalsRoot()
+	if err != nil {
+		return nil, err
+	}
+	wi, err := state.NextWithdrawalIndex()
+	if err != nil {
+		return nil, err
+	}
+	vi, err := state.NextWithdrawalValidatorIndex()
+	if err != nil {
+		return nil, err
+	}
+	summarires, err := state.HistoricalSummaries()
+	if err != nil {
+		return nil, err
+	}
+
+	s := &ethpb.BeaconStateDeneb{
+		GenesisTime:           state.GenesisTime(),
+		GenesisValidatorsRoot: state.GenesisValidatorsRoot(),
+		Slot:                  state.Slot(),
+		Fork: &ethpb.Fork{
+			PreviousVersion: state.Fork().CurrentVersion,
+			CurrentVersion:  params.BeaconConfig().DenebForkVersion,
+			Epoch:           epoch,
+		},
+		LatestBlockHeader:           state.LatestBlockHeader(),
+		BlockRoots:                  state.BlockRoots(),
+		StateRoots:                  state.StateRoots(),
+		HistoricalRoots:             [][]byte{},
+		Eth1Data:                    state.Eth1Data(),
+		Eth1DataVotes:               state.Eth1DataVotes(),
+		Eth1DepositIndex:            state.Eth1DepositIndex(),
+		Validators:                  state.Validators(),
+		Balances:                    state.Balances(),
+		RandaoMixes:                 state.RandaoMixes(),
+		Slashings:                   state.Slashings(),
+		PreviousEpochParticipation:  prevEpochParticipation,
+		CurrentEpochParticipation:   currentEpochParticipation,
+		JustificationBits:           state.JustificationBits(),
+		PreviousJustifiedCheckpoint: state.PreviousJustifiedCheckpoint(),
+		CurrentJustifiedCheckpoint:  state.CurrentJustifiedCheckpoint(),
+		FinalizedCheckpoint:         state.FinalizedCheckpoint(),
+		InactivityScores:            inactivityScores,
+		CurrentSyncCommittee:        currentSyncCommittee,
+		NextSyncCommittee:           nextSyncCommittee,
+		LatestExecutionPayloadHeader: &enginev1.ExecutionPayloadHeaderDeneb{
+			ParentHash:       payloadHeader.ParentHash(),
+			FeeRecipient:     payloadHeader.FeeRecipient(),
+			StateRoot:        payloadHeader.StateRoot(),
+			ReceiptsRoot:     payloadHeader.ReceiptsRoot(),
+			LogsBloom:        payloadHeader.LogsBloom(),
+			PrevRandao:       payloadHeader.PrevRandao(),
+			BlockNumber:      payloadHeader.BlockNumber(),
+			GasLimit:         payloadHeader.GasLimit(),
+			GasUsed:          payloadHeader.GasUsed(),
+			Timestamp:        payloadHeader.Timestamp(),
+			ExtraData:        payloadHeader.ExtraData(),
+			BaseFeePerGas:    payloadHeader.BaseFeePerGas(),
+			BlockHash:        payloadHeader.BlockHash(),
+			ExcessDataGas:    make([]byte, 32),
+			TransactionsRoot: txRoot,
+			WithdrawalsRoot:  wdRoot,
+		},
+		NextWithdrawalIndex:          wi,
+		NextWithdrawalValidatorIndex: vi,
+		HistoricalSummaries:          summarires,
+	}
+
+	return state_native.InitializeFromProtoUnsafeDeneb(s)
+}
+
 // UpgradeToCapella updates a generic state to return the version Capella state.
 func UpgradeToCapella(state state.BeaconState) (state.BeaconState, error) {
 	epoch := time.CurrentEpoch(state)

beacon-chain/core/epoch/epoch_processing.go

@@ -353,7 +353,7 @@ func ProcessRandaoMixesReset(state state.BeaconState) (state.BeaconState, error)
 }
 
 // ProcessHistoricalDataUpdate processes the updates to historical data during epoch processing.
-// From Capella onward, per spec,state's historical summaries are updated instead of historical roots.
+// From Capella onward, per spec, state's historical summaries are updated instead of historical roots.
 func ProcessHistoricalDataUpdate(state state.BeaconState) (state.BeaconState, error) {
 	currentEpoch := time.CurrentEpoch(state)
 	nextEpoch := currentEpoch + 1

beacon-chain/core/time/slot_epoch.go

@@ -81,6 +81,15 @@ func CanUpgradeToCapella(slot primitives.Slot) bool {
 	return epochStart && capellaEpoch
 }
 
+// CanUpgradeToDeneb returns true if the input `slot` can upgrade to Deneb.
+// Spec code:
+// If state.slot % SLOTS_PER_EPOCH == 0 and compute_epoch_at_slot(state.slot) == DENEB_FORK_EPOCH
+func CanUpgradeToDeneb(slot primitives.Slot) bool {
+	epochStart := slots.IsEpochStart(slot)
+	DenebEpoch := slots.ToEpoch(slot) == params.BeaconConfig().DenebForkEpoch
+	return epochStart && DenebEpoch
+}
+
 // CanProcessEpoch checks the eligibility to process epoch.
 // The epoch can be processed at the end of the last slot of every epoch.
 //

beacon-chain/core/transition/BUILD.bazel

@@ -23,7 +23,6 @@ go_library(
         "//beacon-chain/core/execution:go_default_library",
         "//beacon-chain/core/helpers:go_default_library",
         "//beacon-chain/core/time:go_default_library",
-        "//beacon-chain/core/transition/interop:go_default_library",
         "//beacon-chain/core/validators:go_default_library",
         "//beacon-chain/state:go_default_library",
         "//beacon-chain/state/state-native:go_default_library",
@@ -46,6 +45,7 @@ go_library(
         "@com_github_pkg_errors//:go_default_library",
         "@com_github_prometheus_client_golang//prometheus:go_default_library",
         "@com_github_prometheus_client_golang//prometheus/promauto:go_default_library",
+        "@com_github_protolambda_go_kzg//eth:go_default_library",
         "@com_github_sirupsen_logrus//:go_default_library",
         "@io_opencensus_go//trace:go_default_library",
     ],

beacon-chain/core/transition/transition.go

@@ -302,6 +302,14 @@ func ProcessSlots(ctx context.Context, state state.BeaconState, slot primitives.
 				return nil, err
 			}
 		}
+
+		if time.CanUpgradeToDeneb(state.Slot()) {
+			state, err = capella.UpgradeToDeneb(state)
+			if err != nil {
+				tracing.AnnotateError(span, err)
+				return nil, err
+			}
+		}
 	}
 
 	if highestSlot < state.Slot() {

beacon-chain/core/transition/transition_no_verify_sig.go

@@ -6,16 +6,18 @@ import (
 	"fmt"
 
 	"github.com/pkg/errors"
+	"github.com/protolambda/go-kzg/eth"
 	"github.com/prysmaticlabs/prysm/v4/beacon-chain/core/altair"
 	b "github.com/prysmaticlabs/prysm/v4/beacon-chain/core/blocks"
-	"github.com/prysmaticlabs/prysm/v4/beacon-chain/core/transition/interop"
 	v "github.com/prysmaticlabs/prysm/v4/beacon-chain/core/validators"
 	"github.com/prysmaticlabs/prysm/v4/beacon-chain/state"
 	"github.com/prysmaticlabs/prysm/v4/consensus-types/blocks"
 	"github.com/prysmaticlabs/prysm/v4/consensus-types/interfaces"
 	"github.com/prysmaticlabs/prysm/v4/crypto/bls"
+	"github.com/prysmaticlabs/prysm/v4/encoding/bytesutil"
 	"github.com/prysmaticlabs/prysm/v4/monitoring/tracing"
 	"github.com/prysmaticlabs/prysm/v4/runtime/version"
+
 	"go.opencensus.io/trace"
 )
 
@@ -57,9 +59,6 @@ func ExecuteStateTransitionNoVerifyAnySig(
 	defer span.End()
 	var err error
 
-	interop.WriteBlockToDisk(signed, false /* Has the block failed */)
-	interop.WriteStateToDisk(st)
-
 	parentRoot := signed.Block().ParentRoot()
 	st, err = ProcessSlotsUsingNextSlotCache(ctx, st, parentRoot[:], signed.Block().Slot())
 	if err != nil {
@@ -256,7 +255,7 @@ func ProcessOperationsNoVerifyAttsSigs(
 		if err != nil {
 			return nil, err
 		}
-	case version.Altair, version.Bellatrix, version.Capella:
+	case version.Altair, version.Bellatrix, version.Capella, version.Deneb:
 		state, err = altairOperations(ctx, state, signedBeaconBlock)
 		if err != nil {
 			return nil, err
@@ -356,9 +355,48 @@ func ProcessBlockForStateRoot(
 		return nil, errors.Wrap(err, "process_sync_aggregate failed")
 	}
 
+	if signed.Block().Version() == version.Deneb {
+		err := ValidateBlobKzgs(ctx, signed.Block().Body())
+		if err != nil {
+			return nil, errors.Wrap(err, "could not validate blob kzgs")
+		}
+	}
+
 	return state, nil
 }
 
+// ValidateBlobKzgs validates the blob kzgs in the beacon block.
+//
+// Spec code:
+// def process_blob_kzg_commitments(state: BeaconState, body: BeaconBlockBody):
+//
+//	assert verify_kzg_commitments_against_transactions(body.execution_payload.transactions, body.blob_kzg_commitments)
+func ValidateBlobKzgs(ctx context.Context, body interfaces.ReadOnlyBeaconBlockBody) error {
+	_, span := trace.StartSpan(ctx, "core.state.ValidateBlobKzgs")
+	defer span.End()
+
+	payload, err := body.Execution()
+	if err != nil {
+		return errors.Wrap(err, "could not get execution payload from block")
+	}
+	blkKzgs, err := body.BlobKzgCommitments()
+	if err != nil {
+		return errors.Wrap(err, "could not get blob kzg commitments from block")
+	}
+	kzgs := make(eth.KZGCommitmentSequenceImpl, len(blkKzgs))
+	for i := range blkKzgs {
+		kzgs[i] = bytesutil.ToBytes48(blkKzgs[i])
+	}
+	txs, err := payload.Transactions()
+	if err != nil {
+		return errors.Wrap(err, "could not get transactions from payload")
+	}
+	if err := eth.VerifyKZGCommitmentsAgainstTransactions(txs, kzgs); err != nil {
+		return err
+	}
+	return nil
+}
+
 // This calls altair block operations.
 func altairOperations(
 	ctx context.Context,

beacon-chain/db/iface/interface.go

@@ -54,6 +54,11 @@ type ReadOnlyDatabase interface {
 	// Fee recipients operations.
 	FeeRecipientByValidatorID(ctx context.Context, id primitives.ValidatorIndex) (common.Address, error)
 	RegistrationByValidatorID(ctx context.Context, id primitives.ValidatorIndex) (*ethpb.ValidatorRegistrationV1, error)
+
+	// Blob operations.
+	BlobSidecarsByRoot(ctx context.Context, beaconBlockRoot [32]byte) (*ethpb.BlobSidecars, error)
+	BlobSidecarsBySlot(ctx context.Context, slot primitives.Slot) (*ethpb.BlobSidecars, error)
+
 	// origin checkpoint sync support
 	OriginCheckpointBlockRoot(ctx context.Context) ([32]byte, error)
 	BackfillBlockRoot(ctx context.Context) ([32]byte, error)
@@ -89,6 +94,10 @@ type NoHeadAccessDatabase interface {
 	SaveFeeRecipientsByValidatorIDs(ctx context.Context, ids []primitives.ValidatorIndex, addrs []common.Address) error
 	SaveRegistrationsByValidatorIDs(ctx context.Context, ids []primitives.ValidatorIndex, regs []*ethpb.ValidatorRegistrationV1) error
 
+	// Blob operations.
+	SaveBlobSidecar(ctx context.Context, blobSidecars *ethpb.BlobSidecars) error
+	DeleteBlobSidecar(ctx context.Context, beaconBlockRoot [32]byte) error
+
 	CleanUpDirtyStates(ctx context.Context, slotsPerArchivedPoint primitives.Slot) error
 }
 

beacon-chain/db/kv/BUILD.bazel

@@ -5,6 +5,7 @@ go_library(
     srcs = [
         "archived_point.go",
         "backup.go",
+        "blob.go",
         "blocks.go",
         "checkpoint.go",
         "deposit_contract.go",
@@ -74,6 +75,7 @@ go_test(
     srcs = [
         "archived_point_test.go",
         "backup_test.go",
+        "blob_test.go",
         "blocks_test.go",
         "checkpoint_test.go",
         "deposit_contract_test.go",
@@ -107,6 +109,7 @@ go_test(
         "//consensus-types/interfaces:go_default_library",
         "//consensus-types/primitives:go_default_library",
         "//encoding/bytesutil:go_default_library",
+        "//proto/engine/v1:go_default_library",
         "//proto/prysm/v1alpha1:go_default_library",
         "//proto/testing:go_default_library",
         "//testing/assert:go_default_library",

beacon-chain/db/kv/blob.go

@@ -0,0 +1,155 @@
+package kv
+
+import (
+	"bytes"
+	"context"
+	"fmt"
+
+	"github.com/pkg/errors"
+	"github.com/prysmaticlabs/prysm/v4/config/params"
+	types "github.com/prysmaticlabs/prysm/v4/consensus-types/primitives"
+	"github.com/prysmaticlabs/prysm/v4/encoding/bytesutil"
+	ethpb "github.com/prysmaticlabs/prysm/v4/proto/prysm/v1alpha1"
+	bolt "go.etcd.io/bbolt"
+	"go.opencensus.io/trace"
+)
+
+// SaveBlobSidecar saves the blobs for a given epoch in the sidecar bucket. When we receive a blob:
+//
+//  1. Convert slot using a modulo operator to [0, maxSlots] where maxSlots = MAX_BLOB_EPOCHS*SLOTS_PER_EPOCH
+//
+//  2. Compute key for blob as bytes(slot_to_rotating_buffer(blob.slot)) ++ bytes(blob.slot) ++ blob.block_root
+//
+//  3. Begin the save algorithm:  If the incoming blob has a slot bigger than the saved slot at the spot
+//     in the rotating keys buffer, we overwrite all elements for that slot.
+func (s *Store) SaveBlobSidecar(ctx context.Context, blobSidecars *ethpb.BlobSidecars) error {
+	ctx, span := trace.StartSpan(ctx, "BeaconDB.SaveBlobSidecar")
+	defer span.End()
+
+	if blobSidecars == nil || len(blobSidecars.Sidecars) == 0 {
+		return errors.New("nil or empty blob sidecars")
+	}
+
+	return s.db.Update(func(tx *bolt.Tx) error {
+		encodedBlobSidecar, err := encode(ctx, blobSidecars)
+		if err != nil {
+			return err
+		}
+		bkt := tx.Bucket(blobsBucket)
+		c := bkt.Cursor()
+		newKey := blobSidecarKey(blobSidecars.Sidecars[0])
+		rotatingBufferPrefix := newKey[0:8]
+		var replacingKey []byte
+		for k, _ := c.Seek(rotatingBufferPrefix); bytes.HasPrefix(k, rotatingBufferPrefix); k, _ = c.Next() {
+			if len(k) != 0 {
+				replacingKey = k
+				oldSlotBytes := replacingKey[8:16]
+				oldSlot := bytesutil.BytesToSlotBigEndian(oldSlotBytes)
+				if oldSlot >= blobSidecars.Sidecars[0].Slot {
+					return fmt.Errorf("attempted to save blob with slot %d but already have older blob with slot %d", blobSidecars.Sidecars[0].Slot, oldSlot)
+				}
+				break
+			}
+		}
+		// If there is no element stored at blob.slot % MAX_SLOTS_TO_PERSIST_BLOBS, then we simply
+		// store the blob by key and exit early.
+		if len(replacingKey) == 0 {
+			return bkt.Put(newKey, encodedBlobSidecar)
+		}
+
+		if err := bkt.Delete(replacingKey); err != nil {
+			log.WithError(err).Warnf("Could not delete blob with key %#x", replacingKey)
+		}
+		return bkt.Put(newKey, encodedBlobSidecar)
+	})
+}
+
+// BlobSidecarsByRoot retrieves the blobs given a beacon block root.
+func (s *Store) BlobSidecarsByRoot(ctx context.Context, beaconBlockRoot [32]byte) (*ethpb.BlobSidecars, error) {
+	ctx, span := trace.StartSpan(ctx, "BeaconDB.BlobSidecarsByRoot")
+	defer span.End()
+
+	var enc []byte
+	if err := s.db.View(func(tx *bolt.Tx) error {
+		c := tx.Bucket(blobsBucket).Cursor()
+		// Bucket size is bounded and bolt cursors are fast. Moreover, a thin caching layer can be added.
+		for k, v := c.First(); k != nil; k, v = c.Next() {
+			if bytes.HasSuffix(k, beaconBlockRoot[:]) {
+				enc = v
+				break
+			}
+		}
+		return nil
+	}); err != nil {
+		return nil, err
+	}
+	if enc == nil {
+		return nil, nil
+	}
+	sidecars := &ethpb.BlobSidecars{}
+	if err := decode(ctx, enc, sidecars); err != nil {
+		return nil, err
+	}
+	return sidecars, nil
+}
+
+// BlobSidecarsBySlot retrieves sidecars from a slot.
+func (s *Store) BlobSidecarsBySlot(ctx context.Context, slot types.Slot) (*ethpb.BlobSidecars, error) {
+	ctx, span := trace.StartSpan(ctx, "BeaconDB.BlobSidecarsBySlot")
+	defer span.End()
+
+	var enc []byte
+	if err := s.db.View(func(tx *bolt.Tx) error {
+		c := tx.Bucket(blobsBucket).Cursor()
+		// Bucket size is bounded and bolt cursors are fast. Moreover, a thin caching layer can be added.
+		for k, v := c.First(); k != nil; k, v = c.Next() {
+			slotInKey := bytesutil.BytesToSlotBigEndian(k[8:16])
+			if slotInKey == slot {
+				enc = v
+				break
+			}
+		}
+		return nil
+	}); err != nil {
+		return nil, err
+	}
+	if enc == nil {
+		return nil, nil
+	}
+	sidecars := &ethpb.BlobSidecars{}
+	if err := decode(ctx, enc, sidecars); err != nil {
+		return nil, err
+	}
+	return sidecars, nil
+}
+
+// DeleteBlobSidecar returns true if the blobs are in the db.
+func (s *Store) DeleteBlobSidecar(ctx context.Context, beaconBlockRoot [32]byte) error {
+	ctx, span := trace.StartSpan(ctx, "BeaconDB.DeleteBlobSidecar")
+	defer span.End()
+	return s.db.Update(func(tx *bolt.Tx) error {
+		bkt := tx.Bucket(blobsBucket)
+		c := bkt.Cursor()
+		for k, _ := c.First(); k != nil; k, _ = c.Next() {
+			if bytes.HasSuffix(k, beaconBlockRoot[:]) {
+				if err := bkt.Delete(k); err != nil {
+					return err
+				}
+			}
+		}
+		return nil
+	})
+}
+
+// We define a blob sidecar key as: bytes(slot_to_rotating_buffer(blob.slot)) ++ bytes(blob.slot) ++ blob.block_root
+// where slot_to_rotating_buffer(slot) = slot % MAX_SLOTS_TO_PERSIST_BLOBS.
+func blobSidecarKey(blob *ethpb.BlobSidecar) []byte {
+	slotsPerEpoch := params.BeaconConfig().SlotsPerEpoch
+	maxEpochsToPersistBlobs := params.BeaconNetworkConfig().MinEpochsForBlobsSidecarsRequest
+	maxSlotsToPersistBlobs := types.Slot(maxEpochsToPersistBlobs.Mul(uint64(slotsPerEpoch)))
+	slotInRotatingBuffer := blob.Slot.ModSlot(maxSlotsToPersistBlobs)
+	key := bytesutil.SlotToBytesBigEndian(slotInRotatingBuffer)
+	key = append(key, bytesutil.SlotToBytesBigEndian(blob.Slot)...)
+	key = append(key, blob.BlockRoot...)
+	return key
+}

beacon-chain/db/kv/blob_test.go

@@ -0,0 +1,177 @@
+package kv
+
+import (
+	"context"
+	"crypto/rand"
+	"encoding/binary"
+	"testing"
+
+	"github.com/prysmaticlabs/prysm/v4/config/params"
+	"github.com/prysmaticlabs/prysm/v4/consensus-types/primitives"
+	"github.com/prysmaticlabs/prysm/v4/encoding/bytesutil"
+	enginev1 "github.com/prysmaticlabs/prysm/v4/proto/engine/v1"
+	ethpb "github.com/prysmaticlabs/prysm/v4/proto/prysm/v1alpha1"
+	"github.com/prysmaticlabs/prysm/v4/testing/require"
+)
+
+func TestStore_BlobSidecars(t *testing.T) {
+	ctx := context.Background()
+
+	t.Run("empty", func(t *testing.T) {
+		db := setupDB(t)
+		scs := generateBlobSidecars(t, 0)
+		require.ErrorContains(t, "nil or empty blob sidecars", db.SaveBlobSidecar(ctx, scs))
+	})
+	t.Run("empty by root", func(t *testing.T) {
+		db := setupDB(t)
+		got, err := db.BlobSidecarsByRoot(ctx, [32]byte{})
+		require.NoError(t, err)
+		require.DeepEqual(t, (*ethpb.BlobSidecars)(nil), got)
+	})
+	t.Run("empty by slot", func(t *testing.T) {
+		db := setupDB(t)
+		got, err := db.BlobSidecarsBySlot(ctx, 1)
+		require.NoError(t, err)
+		require.DeepEqual(t, (*ethpb.BlobSidecars)(nil), got)
+	})
+	t.Run("save and retrieve by root (one)", func(t *testing.T) {
+		db := setupDB(t)
+		scs := generateBlobSidecars(t, 1)
+		require.NoError(t, db.SaveBlobSidecar(ctx, scs))
+		require.Equal(t, 1, len(scs.Sidecars))
+		got, err := db.BlobSidecarsByRoot(ctx, bytesutil.ToBytes32(scs.Sidecars[0].BlockRoot))
+		require.NoError(t, err)
+		require.Equal(t, 1, len(got.Sidecars))
+		require.DeepEqual(t, scs, got)
+	})
+	t.Run("save and retrieve by root (max)", func(t *testing.T) {
+		db := setupDB(t)
+		scs := generateBlobSidecars(t, params.BeaconConfig().MaxBlobsPerBlock)
+		require.NoError(t, db.SaveBlobSidecar(ctx, scs))
+		require.Equal(t, int(params.BeaconConfig().MaxBlobsPerBlock), len(scs.Sidecars))
+		got, err := db.BlobSidecarsByRoot(ctx, bytesutil.ToBytes32(scs.Sidecars[0].BlockRoot))
+		require.NoError(t, err)
+		require.Equal(t, int(params.BeaconConfig().MaxBlobsPerBlock), len(got.Sidecars))
+		require.DeepEqual(t, scs, got)
+	})
+	t.Run("save and retrieve by slot (one)", func(t *testing.T) {
+		db := setupDB(t)
+		scs := generateBlobSidecars(t, 1)
+		require.NoError(t, db.SaveBlobSidecar(ctx, scs))
+		require.Equal(t, 1, len(scs.Sidecars))
+		got, err := db.BlobSidecarsBySlot(ctx, scs.Sidecars[0].Slot)
+		require.NoError(t, err)
+		require.Equal(t, 1, len(got.Sidecars))
+		require.DeepEqual(t, scs, got)
+	})
+	t.Run("save and retrieve by slot (max)", func(t *testing.T) {
+		db := setupDB(t)
+		scs := generateBlobSidecars(t, params.BeaconConfig().MaxBlobsPerBlock)
+		require.NoError(t, db.SaveBlobSidecar(ctx, scs))
+		require.Equal(t, int(params.BeaconConfig().MaxBlobsPerBlock), len(scs.Sidecars))
+		got, err := db.BlobSidecarsBySlot(ctx, scs.Sidecars[0].Slot)
+		require.NoError(t, err)
+		require.Equal(t, int(params.BeaconConfig().MaxBlobsPerBlock), len(got.Sidecars))
+		require.DeepEqual(t, scs, got)
+	})
+	t.Run("delete works", func(t *testing.T) {
+		db := setupDB(t)
+		scs := generateBlobSidecars(t, params.BeaconConfig().MaxBlobsPerBlock)
+		require.NoError(t, db.SaveBlobSidecar(ctx, scs))
+		require.Equal(t, int(params.BeaconConfig().MaxBlobsPerBlock), len(scs.Sidecars))
+		got, err := db.BlobSidecarsByRoot(ctx, bytesutil.ToBytes32(scs.Sidecars[0].BlockRoot))
+		require.NoError(t, err)
+		require.Equal(t, int(params.BeaconConfig().MaxBlobsPerBlock), len(got.Sidecars))
+		require.DeepEqual(t, scs, got)
+		require.NoError(t, db.DeleteBlobSidecar(ctx, bytesutil.ToBytes32(scs.Sidecars[0].BlockRoot)))
+		got, err = db.BlobSidecarsByRoot(ctx, bytesutil.ToBytes32(scs.Sidecars[0].BlockRoot))
+		require.NoError(t, err)
+		require.DeepEqual(t, (*ethpb.BlobSidecars)(nil), got)
+	})
+	t.Run("saving a blob with older slot", func(t *testing.T) {
+		db := setupDB(t)
+		scs := generateBlobSidecars(t, params.BeaconConfig().MaxBlobsPerBlock)
+		require.NoError(t, db.SaveBlobSidecar(ctx, scs))
+		require.Equal(t, int(params.BeaconConfig().MaxBlobsPerBlock), len(scs.Sidecars))
+		got, err := db.BlobSidecarsByRoot(ctx, bytesutil.ToBytes32(scs.Sidecars[0].BlockRoot))
+		require.NoError(t, err)
+		require.Equal(t, int(params.BeaconConfig().MaxBlobsPerBlock), len(got.Sidecars))
+		require.DeepEqual(t, scs, got)
+		require.ErrorContains(t, "but already have older blob with slot", db.SaveBlobSidecar(ctx, scs))
+	})
+	t.Run("saving a new blob for rotation", func(t *testing.T) {
+		db := setupDB(t)
+		scs := generateBlobSidecars(t, params.BeaconConfig().MaxBlobsPerBlock)
+		require.NoError(t, db.SaveBlobSidecar(ctx, scs))
+		require.Equal(t, int(params.BeaconConfig().MaxBlobsPerBlock), len(scs.Sidecars))
+		oldBlockRoot := scs.Sidecars[0].BlockRoot
+		got, err := db.BlobSidecarsByRoot(ctx, bytesutil.ToBytes32(scs.Sidecars[0].BlockRoot))
+		require.NoError(t, err)
+		require.Equal(t, int(params.BeaconConfig().MaxBlobsPerBlock), len(got.Sidecars))
+		require.DeepEqual(t, scs, got)
+
+		newScs := generateBlobSidecars(t, params.BeaconConfig().MaxBlobsPerBlock)
+		newRetentionSlot := primitives.Slot(params.BeaconNetworkConfig().MinEpochsForBlobsSidecarsRequest.Mul(uint64(params.BeaconConfig().SlotsPerEpoch)))
+		newScs.Sidecars[0].Slot = scs.Sidecars[0].Slot + newRetentionSlot
+		require.NoError(t, db.SaveBlobSidecar(ctx, newScs))
+
+		got, err = db.BlobSidecarsByRoot(ctx, bytesutil.ToBytes32(oldBlockRoot))
+		require.NoError(t, err)
+		require.DeepEqual(t, (*ethpb.BlobSidecars)(nil), got)
+
+		got, err = db.BlobSidecarsByRoot(ctx, bytesutil.ToBytes32(newScs.Sidecars[0].BlockRoot))
+		require.NoError(t, err)
+		require.DeepEqual(t, newScs, got)
+	})
+}
+
+func generateBlobSidecars(t *testing.T, n uint64) *ethpb.BlobSidecars {
+	blobSidecars := make([]*ethpb.BlobSidecar, n)
+	for i := uint64(0); i < n; i++ {
+		blobSidecars[i] = generateBlobSidecar(t)
+	}
+	return &ethpb.BlobSidecars{
+		Sidecars: blobSidecars,
+	}
+}
+
+func generateBlobSidecar(t *testing.T) *ethpb.BlobSidecar {
+	blockRoot := make([]byte, 32)
+	_, err := rand.Read(blockRoot)
+	require.NoError(t, err)
+	index := make([]byte, 8)
+	_, err = rand.Read(index)
+	require.NoError(t, err)
+	slot := make([]byte, 8)
+	_, err = rand.Read(slot)
+	require.NoError(t, err)
+	blockParentRoot := make([]byte, 32)
+	_, err = rand.Read(blockParentRoot)
+	require.NoError(t, err)
+	proposerIndex := make([]byte, 8)
+	_, err = rand.Read(proposerIndex)
+	require.NoError(t, err)
+	blobData := make([]byte, 131072)
+	_, err = rand.Read(blobData)
+	require.NoError(t, err)
+	blob := &enginev1.Blob{
+		Data: blobData,
+	}
+	kzgCommitment := make([]byte, 48)
+	_, err = rand.Read(kzgCommitment)
+	require.NoError(t, err)
+	kzgProof := make([]byte, 48)
+	_, err = rand.Read(kzgProof)
+	require.NoError(t, err)
+
+	return &ethpb.BlobSidecar{
+		BlockRoot:       blockRoot,
+		Index:           binary.LittleEndian.Uint64(index),
+		Slot:            primitives.Slot(binary.LittleEndian.Uint64(slot)),
+		BlockParentRoot: blockParentRoot,
+		ProposerIndex:   primitives.ValidatorIndex(binary.LittleEndian.Uint64(proposerIndex)),
+		Blob:            blob,
+		KzgCommitment:   kzgCommitment,
+		KzgProof:        kzgProof,
+	}
+}

beacon-chain/db/kv/blocks.go

@@ -818,6 +818,16 @@ func unmarshalBlock(_ context.Context, enc []byte) (interfaces.ReadOnlySignedBea
 		if err := rawBlock.UnmarshalSSZ(enc[len(capellaBlindKey):]); err != nil {
 			return nil, errors.Wrap(err, "could not unmarshal blinded Capella block")
 		}
+	case hasDenebKey(enc):
+		rawBlock = &ethpb.SignedBeaconBlockDeneb{}
+		if err := rawBlock.UnmarshalSSZ(enc[len(denebKey):]); err != nil {
+			return nil, err
+		}
+	case hasDenebBlindKey(enc):
+		rawBlock = &ethpb.SignedBlindedBeaconBlockDeneb{}
+		if err := rawBlock.UnmarshalSSZ(enc[len(denebBlindKey):]); err != nil {
+			return nil, errors.Wrap(err, "could not unmarshal blinded Deneb block")
+		}
 	default:
 		// Marshal block bytes to phase 0 beacon block.
 		rawBlock = &ethpb.SignedBeaconBlock{}
@@ -854,6 +864,8 @@ func marshalBlockFull(
 		return nil, err
 	}
 	switch blk.Version() {
+	case version.Deneb:
+		return snappy.Encode(nil, append(denebKey, encodedBlock...)), nil
 	case version.Capella:
 		return snappy.Encode(nil, append(capellaKey, encodedBlock...)), nil
 	case version.Bellatrix:
@@ -888,6 +900,8 @@ func marshalBlockBlinded(
 		return nil, errors.Wrap(err, "could not marshal blinded block")
 	}
 	switch blk.Version() {
+	case version.Deneb:
+		return snappy.Encode(nil, append(denebBlindKey, encodedBlock...)), nil
 	case version.Capella:
 		return snappy.Encode(nil, append(capellaBlindKey, encodedBlock...)), nil
 	case version.Bellatrix:

beacon-chain/db/kv/key.go

@@ -37,3 +37,17 @@ func hasCapellaBlindKey(enc []byte) bool {
 	}
 	return bytes.Equal(enc[:len(capellaBlindKey)], capellaBlindKey)
 }
+
+func hasDenebKey(enc []byte) bool {
+	if len(denebKey) >= len(enc) {
+		return false
+	}
+	return bytes.Equal(enc[:len(denebKey)], denebKey)
+}
+
+func hasDenebBlindKey(enc []byte) bool {
+	if len(denebBlindKey) >= len(enc) {
+		return false
+	}
+	return bytes.Equal(enc[:len(denebBlindKey)], denebBlindKey)
+}

beacon-chain/db/kv/kv.go

@@ -129,6 +129,8 @@ var Buckets = [][]byte{
 
 	feeRecipientBucket,
 	registrationBucket,
+
+	blobsBucket,
 }
 
 // NewKVStore initializes a new boltDB key-value store at the directory

beacon-chain/db/kv/schema.go

@@ -46,6 +46,7 @@ var (
 	finalizedCheckpointKey     = []byte("finalized-checkpoint")
 	powchainDataKey            = []byte("powchain-data")
 	lastValidatedCheckpointKey = []byte("last-validated-checkpoint")
+	blobsBucket                = []byte("blobs")
 
 	// Below keys are used to identify objects are to be fork compatible.
 	// Objects that are only compatible with specific forks should be prefixed with such keys.
@@ -55,6 +56,9 @@ var (
 	capellaKey                 = []byte("capella")
 	capellaBlindKey            = []byte("blind-capella")
 	saveBlindedBeaconBlocksKey = []byte("save-blinded-beacon-blocks")
+	denebKey                   = []byte("deneb")
+	denebBlindKey              = []byte("blind-deneb")
+
 	// block root included in the beacon state used by weak subjectivity initial sync
 	originCheckpointBlockRootKey = []byte("origin-checkpoint-block-root")
 	// block root tracking the progress of backfill, or pointing at genesis if backfill has not been initiated

beacon-chain/db/kv/state.go

@@ -473,6 +473,19 @@ func (s *Store) unmarshalState(_ context.Context, enc []byte, validatorEntries [
 	}
 
 	switch {
+	case hasDenebKey(enc):
+		protoState := &ethpb.BeaconStateDeneb{}
+		if err := protoState.UnmarshalSSZ(enc[len(denebKey):]); err != nil {
+			return nil, errors.Wrap(err, "failed to unmarshal encoding for Deneb")
+		}
+		ok, err := s.isStateValidatorMigrationOver()
+		if err != nil {
+			return nil, err
+		}
+		if ok {
+			protoState.Validators = validatorEntries
+		}
+		return statenative.InitializeFromProtoUnsafeDeneb(protoState)
 	case hasCapellaKey(enc):
 		// Marshal state bytes to capella beacon state.
 		protoState := &ethpb.BeaconStateCapella{}
@@ -580,6 +593,19 @@ func marshalState(ctx context.Context, st state.ReadOnlyBeaconState) ([]byte, er
 			return nil, err
 		}
 		return snappy.Encode(nil, append(capellaKey, rawObj...)), nil
+	case *ethpb.BeaconStateDeneb:
+		rState, ok := st.ToProtoUnsafe().(*ethpb.BeaconStateDeneb)
+		if !ok {
+			return nil, errors.New("non valid inner state")
+		}
+		if rState == nil {
+			return nil, errors.New("nil state")
+		}
+		rawObj, err := rState.MarshalSSZ()
+		if err != nil {
+			return nil, err
+		}
+		return snappy.Encode(nil, append(denebKey, rawObj...)), nil
 	default:
 		return nil, errors.New("invalid inner state")
 	}

beacon-chain/execution/engine_client.go

@@ -35,6 +35,7 @@ const (
 	NewPayloadMethod = "engine_newPayloadV1"
 	// NewPayloadMethodV2 v2 request string for JSON-RPC.
 	NewPayloadMethodV2 = "engine_newPayloadV2"
+	NewPayloadMethodV3 = "engine_newPayloadV3"
 	// ForkchoiceUpdatedMethod v1 request string for JSON-RPC.
 	ForkchoiceUpdatedMethod = "engine_forkchoiceUpdatedV1"
 	// ForkchoiceUpdatedMethodV2 v2 request string for JSON-RPC.
@@ -43,6 +44,9 @@ const (
 	GetPayloadMethod = "engine_getPayloadV1"
 	// GetPayloadMethodV2 v2 request string for JSON-RPC.
 	GetPayloadMethodV2 = "engine_getPayloadV2"
+	GetPayloadMethodV3 = "engine_getPayloadV3"
+	// GetBlobsBundleMethod v1 request string for JSON-RPC.
+	GetBlobsBundleMethod = "engine_getBlobsBundleV1"
 	// ExchangeTransitionConfigurationMethod v1 request string for JSON-RPC.
 	ExchangeTransitionConfigurationMethod = "engine_exchangeTransitionConfigurationV1"
 	// ExecutionBlockByHashMethod request string for JSON-RPC.
@@ -89,6 +93,7 @@ type EngineCaller interface {
 	) error
 	ExecutionBlockByHash(ctx context.Context, hash common.Hash, withTxs bool) (*pb.ExecutionBlock, error)
 	GetTerminalBlockHash(ctx context.Context, transitionTime uint64) ([]byte, bool, error)
+	GetBlobsBundle(ctx context.Context, payloadId [8]byte) (*pb.BlobsBundle, error)
 }
 
 var EmptyBlockHash = errors.New("Block hash is empty 0x0000...")
@@ -126,6 +131,15 @@ func (s *Service) NewPayload(ctx context.Context, payload interfaces.ExecutionDa
 		if err != nil {
 			return nil, handleRPCError(err)
 		}
+	case *pb.ExecutionPayloadDeneb:
+		payloadPb, ok := payload.Proto().(*pb.ExecutionPayloadDeneb)
+		if !ok {
+			return nil, errors.New("execution data must be a Deneb execution payload")
+		}
+		err := s.rpcClient.CallContext(ctx, result, NewPayloadMethodV3, payloadPb)
+		if err != nil {
+			return nil, handleRPCError(err)
+		}
 	default:
 		return nil, errors.New("unknown execution data type")
 	}
@@ -173,7 +187,7 @@ func (s *Service) ForkchoiceUpdated(
 		if err != nil {
 			return nil, nil, handleRPCError(err)
 		}
-	case version.Capella:
+	case version.Capella, version.Deneb:
 		a, err := attrs.PbV2()
 		if err != nil {
 			return nil, nil, err
@@ -215,6 +229,15 @@ func (s *Service) GetPayload(ctx context.Context, payloadId [8]byte, slot primit
 	ctx, cancel := context.WithDeadline(ctx, d)
 	defer cancel()
 
+	if slots.ToEpoch(slot) >= params.BeaconConfig().DenebForkEpoch {
+		result := &pb.ExecutionPayloadDenebWithValue{}
+		err := s.rpcClient.CallContext(ctx, result, GetPayloadMethodV3, pb.PayloadIDBytes(payloadId))
+		if err != nil {
+			return nil, handleRPCError(err)
+		}
+		return blocks.WrappedExecutionPayloadDeneb(result.Payload, big.NewInt(0).SetBytes(bytesutil.ReverseByteOrder(result.Value)))
+	}
+
 	if slots.ToEpoch(slot) >= params.BeaconConfig().CapellaForkEpoch {
 		result := &pb.ExecutionPayloadCapellaWithValue{}
 		err := s.rpcClient.CallContext(ctx, result, GetPayloadMethodV2, pb.PayloadIDBytes(payloadId))
@@ -422,6 +445,19 @@ func (s *Service) ExecutionBlocksByHashes(ctx context.Context, hashes []common.H
 	return execBlks, nil
 }
 
+// GetBlobsBundle calls the engine_getBlobsV1 method via JSON-RPC.
+func (s *Service) GetBlobsBundle(ctx context.Context, payloadId [8]byte) (*pb.BlobsBundle, error) {
+	ctx, span := trace.StartSpan(ctx, "powchain.engine-api-client.GetBlobsBundle")
+	defer span.End()
+
+	d := time.Now().Add(defaultEngineTimeout)
+	ctx, cancel := context.WithDeadline(ctx, d)
+	defer cancel()
+	result := &pb.BlobsBundle{}
+	err := s.rpcClient.CallContext(ctx, result, GetBlobsBundleMethod, pb.PayloadIDBytes(payloadId))
+	return result, handleRPCError(err)
+}
+
 // HeaderByHash returns the relevant header details for the provided block hash.
 func (s *Service) HeaderByHash(ctx context.Context, hash common.Hash) (*types.HeaderInfo, error) {
 	var hdr *types.HeaderInfo

beacon-chain/execution/rpc_connection.go

@@ -3,6 +3,7 @@ package execution
 import (
 	"context"
 	"fmt"
+	"net/http"
 	"net/url"
 	"strings"
 	"time"
@@ -14,7 +15,6 @@ import (
 	contracts "github.com/prysmaticlabs/prysm/v4/contracts/deposit"
 	"github.com/prysmaticlabs/prysm/v4/io/logs"
 	"github.com/prysmaticlabs/prysm/v4/network"
-	"github.com/prysmaticlabs/prysm/v4/network/authorization"
 )
 
 func (s *Service) setupExecutionClientConnections(ctx context.Context, currEndpoint network.Endpoint) error {
@@ -34,7 +34,7 @@ func (s *Service) setupExecutionClientConnections(ctx context.Context, currEndpo
 	}
 	s.depositContractCaller = depositContractCaller
 
-	// Ensure we have the correct chain and deposit IDs.
+	//Ensure we have the correct chain and deposit IDs.
 	if err := ensureCorrectExecutionChain(ctx, fetcher); err != nil {
 		client.Close()
 		errStr := err.Error()
@@ -113,9 +113,21 @@ func (s *Service) newRPCClientWithAuth(ctx context.Context, endpoint network.End
 	if err != nil {
 		return nil, err
 	}
+	headers := http.Header{}
+	for _, h := range s.cfg.headers {
+		if h == "" {
+			continue
+		}
+		keyValue := strings.Split(h, "=")
+		if len(keyValue) < 2 {
+			log.Warnf("Incorrect HTTP header flag format. Skipping %v", keyValue[0])
+			continue
+		}
+		headers.Set(keyValue[0], strings.Join(keyValue[1:], "="))
+	}
 	switch u.Scheme {
 	case "http", "https":
-		client, err = gethRPC.DialOptions(ctx, endpoint.Url, gethRPC.WithHTTPClient(endpoint.HttpClient()))
+		client, err = gethRPC.DialOptions(ctx, endpoint.Url, gethRPC.WithHTTPClient(endpoint.HttpClient()), gethRPC.WithHeaders(headers))
 		if err != nil {
 			return nil, err
 		}
@@ -127,13 +139,6 @@ func (s *Service) newRPCClientWithAuth(ctx context.Context, endpoint network.End
 	default:
 		return nil, fmt.Errorf("no known transport for URL scheme %q", u.Scheme)
 	}
-	if endpoint.Auth.Method != authorization.None {
-		header, err := endpoint.Auth.ToHeaderValue()
-		if err != nil {
-			return nil, err
-		}
-		client.SetHeader("Authorization", header)
-	}
 	for _, h := range s.cfg.headers {
 		if h != "" {
 			keyValue := strings.Split(h, "=")

beacon-chain/execution/testing/mock_engine_client.go

@@ -38,6 +38,7 @@ type EngineClient struct {
 	TerminalBlockHash           []byte
 	TerminalBlockHashExists     bool
 	OverrideValidHash           [32]byte
+	BlobsBundle                 *pb.BlobsBundle
 	BlockValue                  *big.Int
 }
 
@@ -172,3 +173,8 @@ func (e *EngineClient) GetTerminalBlockHash(ctx context.Context, transitionTime
 		blk = parentBlk
 	}
 }
+
+// GetBlobsBundle --
+func (e *EngineClient) GetBlobsBundle(ctx context.Context, payloadId [8]byte) (*pb.BlobsBundle, error) {
+	return e.BlobsBundle, nil
+}

beacon-chain/p2p/broadcaster.go

@@ -141,6 +141,57 @@ func (s *Service) broadcastAttestation(ctx context.Context, subnet uint64, att *
 	}
 }
 
+// BroadcastBlob broadcasts a blob to the p2p network, the message is assumed to be
+// broadcasted to the current fork and to the input subnet.
+func (s *Service) BroadcastBlob(ctx context.Context, subnet uint64, blob *ethpb.SignedBlobSidecar) error {
+	ctx, span := trace.StartSpan(ctx, "p2p.BroadcastBlob")
+	defer span.End()
+	forkDigest, err := s.currentForkDigest()
+	if err != nil {
+		err := errors.Wrap(err, "could not retrieve fork digest")
+		tracing.AnnotateError(span, err)
+		return err
+	}
+
+	// Non-blocking broadcast, with attempts to discover a subnet peer if none available.
+	go s.broadcastBlob(ctx, subnet, blob, forkDigest)
+
+	return nil
+}
+
+func (s *Service) broadcastBlob(ctx context.Context, subnet uint64, blobSidecar *ethpb.SignedBlobSidecar, forkDigest [4]byte) {
+	ctx, span := trace.StartSpan(ctx, "p2p.broadcastBlob")
+	defer span.End()
+	ctx = trace.NewContext(context.Background(), span) // clear parent context / deadline.
+
+	// Ensure we have peers with this subnet.
+	s.subnetLocker(subnet).RLock()
+	hasPeer := s.hasPeerWithSubnet(blobSubnetToTopic(subnet, forkDigest))
+	s.subnetLocker(subnet).RUnlock()
+
+	if !hasPeer {
+		if err := func() error {
+			s.subnetLocker(subnet).Lock()
+			defer s.subnetLocker(subnet).Unlock()
+			ok, err := s.FindPeersWithSubnet(ctx, blobSubnetToTopic(subnet, forkDigest), subnet, 1)
+			if err != nil {
+				return err
+			}
+			if ok {
+				return nil
+			}
+			return errors.New("failed to find peers for subnet")
+		}(); err != nil {
+			log.WithError(err).Error("Failed to find peers")
+		}
+	}
+
+	if err := s.broadcastObject(ctx, blobSidecar, blobSubnetToTopic(subnet, forkDigest)); err != nil {
+		log.WithError(err).Error("Failed to broadcast blob sidecar")
+		tracing.AnnotateError(span, err)
+	}
+}
+
 func (s *Service) broadcastSyncCommittee(ctx context.Context, subnet uint64, sMsg *ethpb.SyncCommitteeMessage, forkDigest [4]byte) {
 	ctx, span := trace.StartSpan(ctx, "p2p.broadcastSyncCommittee")
 	defer span.End()
@@ -232,3 +283,7 @@ func attestationToTopic(subnet uint64, forkDigest [4]byte) string {
 func syncCommitteeToTopic(subnet uint64, forkDigest [4]byte) string {
 	return fmt.Sprintf(SyncCommitteeSubnetTopicFormat, forkDigest, subnet)
 }
+
+func blobSubnetToTopic(subnet uint64, forkDigest [4]byte) string {
+	return fmt.Sprintf(BlobSubnetTopicFormat, forkDigest, subnet)
+}

beacon-chain/p2p/fork_watcher.go

@@ -17,7 +17,8 @@ func (s *Service) forkWatcher() {
 			currEpoch := slots.ToEpoch(currSlot)
 			if currEpoch == params.BeaconConfig().AltairForkEpoch ||
 				currEpoch == params.BeaconConfig().BellatrixForkEpoch ||
-				currEpoch == params.BeaconConfig().CapellaForkEpoch {
+				currEpoch == params.BeaconConfig().CapellaForkEpoch ||
+				currEpoch == params.BeaconConfig().DenebForkEpoch {
 				// If we are in the fork epoch, we update our enr with
 				// the updated fork digest. These repeatedly does
 				// this over the epoch, which might be slightly wasteful

beacon-chain/p2p/gossip_scoring_params.go

@@ -119,6 +119,9 @@ func (s *Service) topicScoreParams(topic string) (*pubsub.TopicScoreParams, erro
 		return defaultProposerSlashingTopicParams(), nil
 	case strings.Contains(topic, GossipAttesterSlashingMessage):
 		return defaultAttesterSlashingTopicParams(), nil
+	case strings.Contains(topic, GossipBlobSidecarMessage):
+		// TODO(Deneb): Using the default block scoring. But this should be updated.
+		return defaultBlockTopicParams(), nil
 	case strings.Contains(topic, GossipBlsToExecutionChangeMessage):
 		return defaultBlsToExecutionChangeTopicParams(), nil
 	default:

beacon-chain/p2p/gossip_topic_mappings.go

@@ -21,12 +21,16 @@ var gossipTopicMappings = map[string]proto.Message{
 	SyncContributionAndProofSubnetTopicFormat: &ethpb.SignedContributionAndProof{},
 	SyncCommitteeSubnetTopicFormat:            &ethpb.SyncCommitteeMessage{},
 	BlsToExecutionChangeSubnetTopicFormat:     &ethpb.SignedBLSToExecutionChange{},
+	BlobSubnetTopicFormat:                     &ethpb.SignedBlobSidecar{},
 }
 
 // GossipTopicMappings is a function to return the assigned data type
 // versioned by epoch.
 func GossipTopicMappings(topic string, epoch primitives.Epoch) proto.Message {
 	if topic == BlockSubnetTopicFormat {
+		if epoch >= params.BeaconConfig().DenebForkEpoch {
+			return &ethpb.SignedBeaconBlockDeneb{}
+		}
 		if epoch >= params.BeaconConfig().CapellaForkEpoch {
 			return &ethpb.SignedBeaconBlockCapella{}
 		}
@@ -64,4 +68,6 @@ func init() {
 	GossipTypeMapping[reflect.TypeOf(&ethpb.SignedBeaconBlockBellatrix{})] = BlockSubnetTopicFormat
 	// Specially handle Capella objects
 	GossipTypeMapping[reflect.TypeOf(&ethpb.SignedBeaconBlockCapella{})] = BlockSubnetTopicFormat
+	// Specially handle Deneb objects
+	GossipTypeMapping[reflect.TypeOf(&ethpb.SignedBeaconBlockDeneb{})] = BlockSubnetTopicFormat
 }

beacon-chain/p2p/interfaces.go

@@ -35,6 +35,7 @@ type Broadcaster interface {
 	Broadcast(context.Context, proto.Message) error
 	BroadcastAttestation(ctx context.Context, subnet uint64, att *ethpb.Attestation) error
 	BroadcastSyncCommitteeMessage(ctx context.Context, subnet uint64, sMsg *ethpb.SyncCommitteeMessage) error
+	BroadcastBlob(ctx context.Context, subnet uint64, blobSidecar *ethpb.SignedBlobSidecar) error
 }
 
 // SetStreamHandler configures p2p to handle streams of a certain topic ID.

beacon-chain/p2p/pubsub_filter.go

@@ -57,12 +57,17 @@ func (s *Service) CanSubscribe(topic string) bool {
 		log.WithError(err).Error("Could not determine Capella fork digest")
 		return false
 	}
-
+	denebForkDigest, err := forks.ForkDigestFromEpoch(params.BeaconConfig().DenebForkEpoch, s.genesisValidatorsRoot)
+	if err != nil {
+		log.WithError(err).Error("Could not determine Capella fork digest")
+		return false
+	}
 	switch parts[2] {
 	case fmt.Sprintf("%x", phase0ForkDigest):
 	case fmt.Sprintf("%x", altairForkDigest):
 	case fmt.Sprintf("%x", bellatrixForkDigest):
 	case fmt.Sprintf("%x", capellaForkDigest):
+	case fmt.Sprintf("%x", denebForkDigest):
 	default:
 		return false
 	}

beacon-chain/p2p/pubsub_filter_test.go

@@ -92,7 +92,7 @@ func TestService_CanSubscribe(t *testing.T) {
 		formatting := []interface{}{digest}
 
 		// Special case for attestation subnets which have a second formatting placeholder.
-		if topic == AttestationSubnetTopicFormat || topic == SyncCommitteeSubnetTopicFormat {
+		if topic == AttestationSubnetTopicFormat || topic == SyncCommitteeSubnetTopicFormat || topic == BlobSubnetTopicFormat {
 			formatting = append(formatting, 0 /* some subnet ID */)
 		}
 

beacon-chain/p2p/rpc_topic_mappings.go

@@ -37,6 +37,8 @@ const PingMessageName = "/ping"
 // MetadataMessageName specifies the name for the metadata message topic.
 const MetadataMessageName = "/metadata"
 
+const BlobSidecarsByRootName = "/blob_sidecars_by_root"
+
 const (
 	// V1 RPC Topics
 	// RPCStatusTopicV1 defines the v1 topic for the status rpc method.
@@ -51,6 +53,9 @@ const (
 	RPCPingTopicV1 = protocolPrefix + PingMessageName + SchemaVersionV1
 	// RPCMetaDataTopicV1 defines the v1 topic for the metadata rpc method.
 	RPCMetaDataTopicV1 = protocolPrefix + MetadataMessageName + SchemaVersionV1
+	// RPCBlobSidecarsByRootTopicV1 is a topic for requestion blob sidecars by their block root. New in deneb.
+	// /eth2/beacon_chain/req/blob_sidecars_by_root/1/
+	RPCBlobSidecarsByRootTopicV1 = protocolPrefix + BlobSidecarsByRootName + SchemaVersionV1
 
 	// V2 RPC Topics
 	// RPCBlocksByRangeTopicV2 defines v2 the topic for the blocks by range rpc method.
@@ -83,6 +88,8 @@ var RPCTopicMappings = map[string]interface{}{
 	// RPC Metadata Message
 	RPCMetaDataTopicV1: new(interface{}),
 	RPCMetaDataTopicV2: new(interface{}),
+	// RPC Blobs Sidecars By Root Message
+	RPCBlobSidecarsByRootTopicV1: new(p2ptypes.BlobSidecarsByRootReq),
 }
 
 // Maps all registered protocol prefixes.
@@ -99,6 +106,7 @@ var messageMapping = map[string]bool{
 	BeaconBlocksByRootsMessageName: true,
 	PingMessageName:                true,
 	MetadataMessageName:            true,
+	BlobSidecarsByRootName:         true,
 }
 
 // Maps all the RPC messages which are to updated in altair.
@@ -113,6 +121,16 @@ var versionMapping = map[string]bool{
 	SchemaVersionV2: true,
 }
 
+var PreAltairV1SchemaMapping = map[string]bool{
+	StatusMessageName:              true,
+	GoodbyeMessageName:             true,
+	BeaconBlocksByRangeMessageName: true,
+	BeaconBlocksByRootsMessageName: true,
+	PingMessageName:                true,
+	MetadataMessageName:            true,
+	BlobSidecarsByRootName:         false,
+}
+
 // VerifyTopicMapping verifies that the topic and its accompanying
 // message type is correct.
 func VerifyTopicMapping(topic string, msg interface{}) error {

beacon-chain/p2p/testing/fuzz_p2p.go

@@ -138,6 +138,11 @@ func (_ *FakeP2P) BroadcastAttestation(_ context.Context, _ uint64, _ *ethpb.Att
 	return nil
 }
 
+// BroadcastBlob -- fake.
+func (p *FakeP2P) BroadcastBlob(ctx context.Context, subnet uint64, blobSidecar *ethpb.SignedBlobSidecar) error {
+	return nil
+}
+
 // BroadcastSyncCommitteeMessage -- fake.
 func (_ *FakeP2P) BroadcastSyncCommitteeMessage(_ context.Context, _ uint64, _ *ethpb.SyncCommitteeMessage) error {
 	return nil

beacon-chain/p2p/testing/mock_broadcaster.go

@@ -33,3 +33,9 @@ func (m *MockBroadcaster) BroadcastSyncCommitteeMessage(_ context.Context, _ uin
 	m.BroadcastCalled = true
 	return nil
 }
+
+// BroadcastSyncCommitteeMessage records a broadcast occurred.
+func (m *MockBroadcaster) BroadcastBlob(ctx context.Context, subnet uint64, blob *ethpb.SignedBlobSidecar) error {
+	m.BroadcastCalled = true
+	return nil
+}

beacon-chain/p2p/testing/p2p.go

@@ -170,6 +170,11 @@ func (p *TestP2P) BroadcastAttestation(_ context.Context, _ uint64, _ *ethpb.Att
 	return nil
 }
 
+func (p *TestP2P) BroadcastBlob(ctx context.Context, subnet uint64, blobSidecar *ethpb.SignedBlobSidecar) error {
+	p.BroadcastCalled = true
+	return nil
+}
+
 // BroadcastSyncCommitteeMessage broadcasts a sync committee message.
 func (p *TestP2P) BroadcastSyncCommitteeMessage(_ context.Context, _ uint64, _ *ethpb.SyncCommitteeMessage) error {
 	p.BroadcastCalled = true

beacon-chain/p2p/topics.go

@@ -28,6 +28,8 @@ const (
 	GossipContributionAndProofMessage = "sync_committee_contribution_and_proof"
 	// GossipBlsToExecutionChangeMessage is the name for the bls to execution change message type.
 	GossipBlsToExecutionChangeMessage = "bls_to_execution_change"
+	// GossipBlobSidecarMessage is the name for the blob sidecar message type.
+	GossipBlobSidecarMessage = "blob_sidecar"
 
 	// Topic Formats
 	//
@@ -49,4 +51,6 @@ const (
 	SyncContributionAndProofSubnetTopicFormat = GossipProtocolAndDigest + GossipContributionAndProofMessage
 	// BlsToExecutionChangeSubnetTopicFormat is the topic format for the bls to execution change subnet.
 	BlsToExecutionChangeSubnetTopicFormat = GossipProtocolAndDigest + GossipBlsToExecutionChangeMessage
+	// BlobSubnetTopicFormat is the topic format for the blob subnet.
+	BlobSubnetTopicFormat = GossipProtocolAndDigest + GossipBlobSidecarMessage + "_%d"
 )

beacon-chain/p2p/types/object_mapping.go

@@ -53,6 +53,11 @@ func InitializeDataMaps() {
 				&ethpb.SignedBeaconBlockCapella{Block: &ethpb.BeaconBlockCapella{Body: &ethpb.BeaconBlockBodyCapella{}}},
 			)
 		},
+		bytesutil.ToBytes4(params.BeaconConfig().DenebForkVersion): func() (interfaces.ReadOnlySignedBeaconBlock, error) {
+			return blocks.NewSignedBeaconBlock(
+				&ethpb.SignedBeaconBlockDeneb{Block: &ethpb.BeaconBlockDeneb{Body: &ethpb.BeaconBlockBodyDeneb{}}},
+			)
+		},
 	}
 
 	// Reset our metadata map.
@@ -69,5 +74,8 @@ func InitializeDataMaps() {
 		bytesutil.ToBytes4(params.BeaconConfig().CapellaForkVersion): func() metadata.Metadata {
 			return wrapper.WrappedMetadataV1(&ethpb.MetaDataV1{})
 		},
+		bytesutil.ToBytes4(params.BeaconConfig().DenebForkVersion): func() metadata.Metadata {
+			return wrapper.WrappedMetadataV1(&ethpb.MetaDataV1{})
+		},
 	}
 }

beacon-chain/p2p/types/rpc_errors.go

@@ -12,4 +12,5 @@ var (
 	ErrRateLimited            = errors.New("rate limited")
 	ErrIODeadline             = errors.New("i/o deadline exceeded")
 	ErrInvalidRequest         = errors.New("invalid range, step or count")
+	ErrBlobLTMinRequest       = errors.New("blob slot < minimum_request_epoch")
 )

beacon-chain/p2p/types/types.go

@@ -7,6 +7,7 @@ import (
 	"github.com/pkg/errors"
 	ssz "github.com/prysmaticlabs/fastssz"
 	"github.com/prysmaticlabs/prysm/v4/config/params"
+	eth "github.com/prysmaticlabs/prysm/v4/proto/prysm/v1alpha1"
 )
 
 const rootLength = 32
@@ -31,6 +32,7 @@ func (b *SSZBytes) HashTreeRootWith(hh *ssz.Hasher) error {
 
 // BeaconBlockByRootsReq specifies the block by roots request type.
 type BeaconBlockByRootsReq [][rootLength]byte
+type BlobSidecarsByRootReq []*eth.BlobIdentifier
 
 // MarshalSSZTo marshals the block by roots request with the provided byte slice.
 func (r *BeaconBlockByRootsReq) MarshalSSZTo(dst []byte) ([]byte, error) {

beacon-chain/rpc/apimiddleware/custom_hooks.go

@@ -503,6 +503,13 @@ type capellaBlockResponseJson struct {
 	Finalized           bool                                   `json:"finalized"`
 }
 
+type denebBlockResponseJson struct {
+	Version             string                               `json:"version"`
+	Data                *SignedBeaconBlockDenebContainerJson `json:"data"`
+	ExecutionOptimistic bool                                 `json:"execution_optimistic"`
+	Finalized           bool                                 `json:"finalized"`
+}
+
 type bellatrixBlindedBlockResponseJson struct {
 	Version             string                                          `json:"version" enum:"true"`
 	Data                *SignedBlindedBeaconBlockBellatrixContainerJson `json:"data"`
@@ -517,6 +524,12 @@ type capellaBlindedBlockResponseJson struct {
 	Finalized           bool                                          `json:"finalized"`
 }
 
+type denebBlindedBlockResponseJson struct {
+	Version             string                                      `json:"version"`
+	Data                *SignedBlindedBeaconBlockDenebContainerJson `json:"data"`
+	ExecutionOptimistic bool                                        `json:"execution_optimistic"`
+}
+
 func serializeV2Block(response interface{}) (apimiddleware.RunDefault, []byte, apimiddleware.ErrorJson) {
 	respContainer, ok := response.(*BlockV2ResponseJson)
 	if !ok {
@@ -565,6 +578,16 @@ func serializeV2Block(response interface{}) (apimiddleware.RunDefault, []byte, a
 			ExecutionOptimistic: respContainer.ExecutionOptimistic,
 			Finalized:           respContainer.Finalized,
 		}
+	case strings.EqualFold(respContainer.Version, strings.ToLower(ethpbv2.Version_Deneb.String())):
+		actualRespContainer = &denebBlockResponseJson{
+			Version: respContainer.Version,
+			Data: &SignedBeaconBlockDenebContainerJson{
+				Message:   respContainer.Data.DenebBlock,
+				Signature: respContainer.Data.Signature,
+			},
+			ExecutionOptimistic: respContainer.ExecutionOptimistic,
+			Finalized:           respContainer.Finalized,
+		}
 	default:
 		return false, nil, apimiddleware.InternalServerError(fmt.Errorf("unsupported block version '%s'", respContainer.Version))
 	}
@@ -624,6 +647,15 @@ func serializeBlindedBlock(response interface{}) (apimiddleware.RunDefault, []by
 			ExecutionOptimistic: respContainer.ExecutionOptimistic,
 			Finalized:           respContainer.Finalized,
 		}
+	case strings.EqualFold(respContainer.Version, strings.ToLower(ethpbv2.Version_Deneb.String())):
+		actualRespContainer = &denebBlindedBlockResponseJson{
+			Version: respContainer.Version,
+			Data: &SignedBlindedBeaconBlockDenebContainerJson{
+				Message:   respContainer.Data.DenebBlock,
+				Signature: respContainer.Data.Signature,
+			},
+			ExecutionOptimistic: respContainer.ExecutionOptimistic,
+		}
 	default:
 		return false, nil, apimiddleware.InternalServerError(fmt.Errorf("unsupported block version '%s'", respContainer.Version))
 	}
@@ -655,6 +687,11 @@ type capellaStateResponseJson struct {
 	Data    *BeaconStateCapellaJson `json:"data"`
 }
 
+type denebStateResponseJson struct {
+	Version string                `json:"version"`
+	Data    *BeaconStateDenebJson `json:"data"`
+}
+
 func serializeV2State(response interface{}) (apimiddleware.RunDefault, []byte, apimiddleware.ErrorJson) {
 	respContainer, ok := response.(*BeaconStateV2ResponseJson)
 	if !ok {
@@ -683,6 +720,11 @@ func serializeV2State(response interface{}) (apimiddleware.RunDefault, []byte, a
 			Version: respContainer.Version,
 			Data:    respContainer.Data.CapellaState,
 		}
+	case strings.EqualFold(respContainer.Version, strings.ToLower(ethpbv2.Version_Deneb.String())):
+		actualRespContainer = &denebStateResponseJson{
+			Version: respContainer.Version,
+			Data:    respContainer.Data.DenebState,
+		}
 	default:
 		return false, nil, apimiddleware.InternalServerError(fmt.Errorf("unsupported state version '%s'", respContainer.Version))
 	}

beacon-chain/rpc/apimiddleware/structs.go

@@ -395,6 +395,7 @@ type SignedBeaconBlockContainerV2Json struct {
 	AltairBlock    *BeaconBlockAltairJson    `json:"altair_block"`
 	BellatrixBlock *BeaconBlockBellatrixJson `json:"bellatrix_block"`
 	CapellaBlock   *BeaconBlockCapellaJson   `json:"capella_block"`
+	DenebBlock     *BeaconBlockDenebJson     `json:"deneb_block"`
 	Signature      string                    `json:"signature" hex:"true"`
 }
 
@@ -403,6 +404,7 @@ type SignedBlindedBeaconBlockContainerJson struct {
 	AltairBlock    *BeaconBlockAltairJson           `json:"altair_block"`
 	BellatrixBlock *BlindedBeaconBlockBellatrixJson `json:"bellatrix_block"`
 	CapellaBlock   *BlindedBeaconBlockCapellaJson   `json:"capella_block"`
+	DenebBlock     *BlindedBeaconBlockDenebJson     `json:"deneb_block"`
 	Signature      string                           `json:"signature" hex:"true"`
 }
 
@@ -411,6 +413,7 @@ type BeaconBlockContainerV2Json struct {
 	AltairBlock    *BeaconBlockAltairJson    `json:"altair_block"`
 	BellatrixBlock *BeaconBlockBellatrixJson `json:"bellatrix_block"`
 	CapellaBlock   *BeaconBlockCapellaJson   `json:"capella_block"`
+	DenebBlock     *BeaconBlockDenebJson     `json:"deneb_block"`
 }
 
 type BlindedBeaconBlockContainerJson struct {
@@ -418,6 +421,7 @@ type BlindedBeaconBlockContainerJson struct {
 	AltairBlock    *BeaconBlockAltairJson           `json:"altair_block"`
 	BellatrixBlock *BlindedBeaconBlockBellatrixJson `json:"bellatrix_block"`
 	CapellaBlock   *BlindedBeaconBlockCapellaJson   `json:"capella_block"`
+	DenebBlock     *BlindedBeaconBlockDenebJson     `json:"deneb_block"`
 }
 
 type SignedBeaconBlockAltairContainerJson struct {
@@ -435,6 +439,11 @@ type SignedBeaconBlockCapellaContainerJson struct {
 	Signature string                  `json:"signature" hex:"true"`
 }
 
+type SignedBeaconBlockDenebContainerJson struct {
+	Message   *BeaconBlockDenebJson `json:"message"`
+	Signature string                `json:"signature" hex:"true"`
+}
+
 type SignedBlindedBeaconBlockBellatrixContainerJson struct {
 	Message   *BlindedBeaconBlockBellatrixJson `json:"message"`
 	Signature string                           `json:"signature" hex:"true"`
@@ -445,6 +454,11 @@ type SignedBlindedBeaconBlockCapellaContainerJson struct {
 	Signature string                         `json:"signature" hex:"true"`
 }
 
+type SignedBlindedBeaconBlockDenebContainerJson struct {
+	Message   *BlindedBeaconBlockDenebJson `json:"message"`
+	Signature string                       `json:"signature" hex:"true"`
+}
+
 type BeaconBlockAltairJson struct {
 	Slot          string                     `json:"slot"`
 	ProposerIndex string                     `json:"proposer_index"`
@@ -469,6 +483,14 @@ type BeaconBlockCapellaJson struct {
 	Body          *BeaconBlockBodyCapellaJson `json:"body"`
 }
 
+type BeaconBlockDenebJson struct {
+	Slot          string                    `json:"slot"`
+	ProposerIndex string                    `json:"proposer_index"`
+	ParentRoot    string                    `json:"parent_root" hex:"true"`
+	StateRoot     string                    `json:"state_root" hex:"true"`
+	Body          *BeaconBlockBodyDenebJson `json:"body"`
+}
+
 type BlindedBeaconBlockBellatrixJson struct {
 	Slot          string                               `json:"slot"`
 	ProposerIndex string                               `json:"proposer_index"`
@@ -485,6 +507,14 @@ type BlindedBeaconBlockCapellaJson struct {
 	Body          *BlindedBeaconBlockBodyCapellaJson `json:"body"`
 }
 
+type BlindedBeaconBlockDenebJson struct {
+	Slot          string                           `json:"slot"`
+	ProposerIndex string                           `json:"proposer_index"`
+	ParentRoot    string                           `json:"parent_root" hex:"true"`
+	StateRoot     string                           `json:"state_root" hex:"true"`
+	Body          *BlindedBeaconBlockBodyDenebJson `json:"body"`
+}
+
 type BeaconBlockBodyAltairJson struct {
 	RandaoReveal      string                     `json:"randao_reveal" hex:"true"`
 	Eth1Data          *Eth1DataJson              `json:"eth1_data"`
@@ -524,6 +554,21 @@ type BeaconBlockBodyCapellaJson struct {
 	BLSToExecutionChanges []*SignedBLSToExecutionChangeJson `json:"bls_to_execution_changes"`
 }
 
+type BeaconBlockBodyDenebJson struct {
+	RandaoReveal          string                            `json:"randao_reveal" hex:"true"`
+	Eth1Data              *Eth1DataJson                     `json:"eth1_data"`
+	Graffiti              string                            `json:"graffiti" hex:"true"`
+	ProposerSlashings     []*ProposerSlashingJson           `json:"proposer_slashings"`
+	AttesterSlashings     []*AttesterSlashingJson           `json:"attester_slashings"`
+	Attestations          []*AttestationJson                `json:"attestations"`
+	Deposits              []*DepositJson                    `json:"deposits"`
+	VoluntaryExits        []*SignedVoluntaryExitJson        `json:"voluntary_exits"`
+	SyncAggregate         *SyncAggregateJson                `json:"sync_aggregate"`
+	ExecutionPayload      *ExecutionPayloadDenebJson        `json:"execution_payload"`
+	BLSToExecutionChanges []*SignedBLSToExecutionChangeJson `json:"bls_to_execution_changes"`
+	BlobKzgCommitments    []string                          `json:"blob_kzg_commitments" hex:"true"`
+}
+
 type BlindedBeaconBlockBodyBellatrixJson struct {
 	RandaoReveal           string                      `json:"randao_reveal" hex:"true"`
 	Eth1Data               *Eth1DataJson               `json:"eth1_data"`
@@ -551,6 +596,21 @@ type BlindedBeaconBlockBodyCapellaJson struct {
 	BLSToExecutionChanges  []*SignedBLSToExecutionChangeJson  `json:"bls_to_execution_changes"`
 }
 
+type BlindedBeaconBlockBodyDenebJson struct {
+	RandaoReveal           string                            `json:"randao_reveal" hex:"true"`
+	Eth1Data               *Eth1DataJson                     `json:"eth1_data"`
+	Graffiti               string                            `json:"graffiti" hex:"true"`
+	ProposerSlashings      []*ProposerSlashingJson           `json:"proposer_slashings"`
+	AttesterSlashings      []*AttesterSlashingJson           `json:"attester_slashings"`
+	Attestations           []*AttestationJson                `json:"attestations"`
+	Deposits               []*DepositJson                    `json:"deposits"`
+	VoluntaryExits         []*SignedVoluntaryExitJson        `json:"voluntary_exits"`
+	SyncAggregate          *SyncAggregateJson                `json:"sync_aggregate"`
+	ExecutionPayloadHeader *ExecutionPayloadHeaderDenebJson  `json:"execution_payload_header"`
+	BLSToExecutionChanges  []*SignedBLSToExecutionChangeJson `json:"bls_to_execution_changes"`
+	BlobKzgCommitments     []string                          `json:"blob_kzg_commitments" hex:"true"`
+}
+
 type ExecutionPayloadJson struct {
 	ParentHash    string   `json:"parent_hash" hex:"true"`
 	FeeRecipient  string   `json:"fee_recipient" hex:"true"`
@@ -586,6 +646,25 @@ type ExecutionPayloadCapellaJson struct {
 	Withdrawals   []*WithdrawalJson `json:"withdrawals"`
 }
 
+type ExecutionPayloadDenebJson struct {
+	ParentHash    string            `json:"parent_hash" hex:"true"`
+	FeeRecipient  string            `json:"fee_recipient" hex:"true"`
+	StateRoot     string            `json:"state_root" hex:"true"`
+	ReceiptsRoot  string            `json:"receipts_root" hex:"true"`
+	LogsBloom     string            `json:"logs_bloom" hex:"true"`
+	PrevRandao    string            `json:"prev_randao" hex:"true"`
+	BlockNumber   string            `json:"block_number"`
+	GasLimit      string            `json:"gas_limit"`
+	GasUsed       string            `json:"gas_used"`
+	TimeStamp     string            `json:"timestamp"`
+	ExtraData     string            `json:"extra_data" hex:"true"`
+	BaseFeePerGas string            `json:"base_fee_per_gas" uint256:"true"`
+	ExcessDataGas string            `json:"excess_data_gas" uint256:"true"`
+	BlockHash     string            `json:"block_hash" hex:"true"`
+	Transactions  []string          `json:"transactions" hex:"true"`
+	Withdrawals   []*WithdrawalJson `json:"withdrawals"`
+}
+
 type ExecutionPayloadHeaderJson struct {
 	ParentHash       string `json:"parent_hash" hex:"true"`
 	FeeRecipient     string `json:"fee_recipient" hex:"true"`
@@ -621,6 +700,25 @@ type ExecutionPayloadHeaderCapellaJson struct {
 	WithdrawalsRoot  string `json:"withdrawals_root" hex:"true"`
 }
 
+type ExecutionPayloadHeaderDenebJson struct {
+	ParentHash       string `json:"parent_hash" hex:"true"`
+	FeeRecipient     string `json:"fee_recipient" hex:"true"`
+	StateRoot        string `json:"state_root" hex:"true"`
+	ReceiptsRoot     string `json:"receipts_root" hex:"true"`
+	LogsBloom        string `json:"logs_bloom" hex:"true"`
+	PrevRandao       string `json:"prev_randao" hex:"true"`
+	BlockNumber      string `json:"block_number"`
+	GasLimit         string `json:"gas_limit"`
+	GasUsed          string `json:"gas_used"`
+	TimeStamp        string `json:"timestamp"`
+	ExtraData        string `json:"extra_data" hex:"true"`
+	BaseFeePerGas    string `json:"base_fee_per_gas" uint256:"true"`
+	ExcessDataGas    string `json:"excess_data_gas" uint256:"true"`
+	BlockHash        string `json:"block_hash" hex:"true"`
+	TransactionsRoot string `json:"transactions_root" hex:"true"`
+	WithdrawalsRoot  string `json:"withdrawals_root" hex:"true"`
+}
+
 type SyncAggregateJson struct {
 	SyncCommitteeBits      string `json:"sync_committee_bits" hex:"true"`
 	SyncCommitteeSignature string `json:"sync_committee_signature" hex:"true"`
@@ -877,11 +975,42 @@ type BeaconStateCapellaJson struct {
 	HistoricalSummaries          []*HistoricalSummaryJson           `json:"historical_summaries"`
 }
 
+type BeaconStateDenebJson struct {
+	GenesisTime                  string                           `json:"genesis_time"`
+	GenesisValidatorsRoot        string                           `json:"genesis_validators_root" hex:"true"`
+	Slot                         string                           `json:"slot"`
+	Fork                         *ForkJson                        `json:"fork"`
+	LatestBlockHeader            *BeaconBlockHeaderJson           `json:"latest_block_header"`
+	BlockRoots                   []string                         `json:"block_roots" hex:"true"`
+	StateRoots                   []string                         `json:"state_roots" hex:"true"`
+	HistoricalRoots              []string                         `json:"historical_roots" hex:"true"`
+	Eth1Data                     *Eth1DataJson                    `json:"eth1_data"`
+	Eth1DataVotes                []*Eth1DataJson                  `json:"eth1_data_votes"`
+	Eth1DepositIndex             string                           `json:"eth1_deposit_index"`
+	Validators                   []*ValidatorJson                 `json:"validators"`
+	Balances                     []string                         `json:"balances"`
+	RandaoMixes                  []string                         `json:"randao_mixes" hex:"true"`
+	Slashings                    []string                         `json:"slashings"`
+	PreviousEpochParticipation   EpochParticipation               `json:"previous_epoch_participation"`
+	CurrentEpochParticipation    EpochParticipation               `json:"current_epoch_participation"`
+	JustificationBits            string                           `json:"justification_bits" hex:"true"`
+	PreviousJustifiedCheckpoint  *CheckpointJson                  `json:"previous_justified_checkpoint"`
+	CurrentJustifiedCheckpoint   *CheckpointJson                  `json:"current_justified_checkpoint"`
+	FinalizedCheckpoint          *CheckpointJson                  `json:"finalized_checkpoint"`
+	InactivityScores             []string                         `json:"inactivity_scores"`
+	CurrentSyncCommittee         *SyncCommitteeJson               `json:"current_sync_committee"`
+	NextSyncCommittee            *SyncCommitteeJson               `json:"next_sync_committee"`
+	LatestExecutionPayloadHeader *ExecutionPayloadHeaderDenebJson `json:"latest_execution_payload_header"`
+	NextWithdrawalIndex          string                           `json:"next_withdrawal_index"`
+	NextWithdrawalValidatorIndex string                           `json:"next_withdrawal_validator_index"`
+}
+
 type BeaconStateContainerV2Json struct {
 	Phase0State    *BeaconStateJson          `json:"phase0_state"`
 	AltairState    *BeaconStateAltairJson    `json:"altair_state"`
 	BellatrixState *BeaconStateBellatrixJson `json:"bellatrix_state"`
 	CapellaState   *BeaconStateCapellaJson   `json:"capella_state"`
+	DenebState     *BeaconStateDenebJson     `json:"deneb_state"`
 }
 
 type ForkJson struct {

beacon-chain/rpc/eth/beacon/blocks.go

@@ -382,6 +382,14 @@ func (bs *Server) GetBlockV2(ctx context.Context, req *ethpbv2.BlockRequestV2) (
 	if !errors.Is(err, blocks.ErrUnsupportedGetter) {
 		return nil, status.Errorf(codes.Internal, "Could not get signed beacon block: %v", err)
 	}
+	result, err = bs.getBlockDeneb(ctx, blk)
+	if result != nil {
+		return result, nil
+	}
+	// ErrUnsupportedGetter means that we have another block type
+	if !errors.Is(err, blocks.ErrUnsupportedGetter) {
+		return nil, status.Errorf(codes.Internal, "Could not get signed beacon block: %v", err)
+	}
 	return nil, status.Errorf(codes.Internal, "Unknown block type %T", blk)
 }
 
@@ -436,6 +444,14 @@ func (bs *Server) GetBlockSSZV2(ctx context.Context, req *ethpbv2.BlockRequestV2
 	if !errors.Is(err, blocks.ErrUnsupportedGetter) {
 		return nil, status.Errorf(codes.Internal, "Could not get signed beacon block: %v", err)
 	}
+	result, err = bs.getSSZBlockDeneb(ctx, blk)
+	if result != nil {
+		return result, nil
+	}
+	// ErrUnsupportedGetter means that we have another block type
+	if !errors.Is(err, blocks.ErrUnsupportedGetter) {
+		return nil, status.Errorf(codes.Internal, "Could not get signed beacon block: %v", err)
+	}
 
 	return nil, status.Errorf(codes.Internal, "Unknown block type %T", blk)
 }
@@ -817,6 +833,76 @@ func (bs *Server) getBlockCapella(ctx context.Context, blk interfaces.ReadOnlySi
 	}, nil
 }
 
+func (bs *Server) getBlockDeneb(ctx context.Context, blk interfaces.ReadOnlySignedBeaconBlock) (*ethpbv2.BlockResponseV2, error) {
+	denebBlk, err := blk.PbDenebBlock()
+	if err != nil {
+		// ErrUnsupportedGetter means that we have another block type
+		if errors.Is(err, blocks.ErrUnsupportedGetter) {
+			if blindedDenebBlk, err := blk.PbBlindedDenebBlock(); err == nil {
+				if blindedDenebBlk == nil {
+					return nil, errNilBlock
+				}
+				signedFullBlock, err := bs.ExecutionPayloadReconstructor.ReconstructFullBlock(ctx, blk)
+				if err != nil {
+					return nil, errors.Wrapf(err, "could not reconstruct full execution payload to create signed beacon block")
+				}
+				denebBlk, err = signedFullBlock.PbDenebBlock()
+				if err != nil {
+					return nil, errors.Wrapf(err, "could not get signed beacon block")
+				}
+				v2Blk, err := migration.V1Alpha1BeaconBlockDenebToV2(denebBlk.Block)
+				if err != nil {
+					return nil, errors.Wrapf(err, "could not convert beacon block")
+				}
+				root, err := blk.Block().HashTreeRoot()
+				if err != nil {
+					return nil, errors.Wrapf(err, "could not get block root")
+				}
+				isOptimistic, err := bs.OptimisticModeFetcher.IsOptimisticForRoot(ctx, root)
+				if err != nil {
+					return nil, errors.Wrapf(err, "could not check if block is optimistic")
+				}
+				sig := blk.Signature()
+				return &ethpbv2.BlockResponseV2{
+					Version: ethpbv2.Version_Deneb,
+					Data: &ethpbv2.SignedBeaconBlockContainer{
+						Message:   &ethpbv2.SignedBeaconBlockContainer_DenebBlock{DenebBlock: v2Blk},
+						Signature: sig[:],
+					},
+					ExecutionOptimistic: isOptimistic,
+				}, nil
+			}
+			return nil, err
+		}
+		return nil, err
+	}
+
+	if denebBlk == nil {
+		return nil, errNilBlock
+	}
+	v2Blk, err := migration.V1Alpha1BeaconBlockDenebToV2(denebBlk.Block)
+	if err != nil {
+		return nil, errors.Wrapf(err, "could not convert beacon block")
+	}
+	root, err := blk.Block().HashTreeRoot()
+	if err != nil {
+		return nil, errors.Wrapf(err, "could not get block root")
+	}
+	isOptimistic, err := bs.OptimisticModeFetcher.IsOptimisticForRoot(ctx, root)
+	if err != nil {
+		return nil, errors.Wrapf(err, "could not check if block is optimistic")
+	}
+	sig := blk.Signature()
+	return &ethpbv2.BlockResponseV2{
+		Version: ethpbv2.Version_Deneb,
+		Data: &ethpbv2.SignedBeaconBlockContainer{
+			Message:   &ethpbv2.SignedBeaconBlockContainer_DenebBlock{DenebBlock: v2Blk},
+			Signature: sig[:],
+		},
+		ExecutionOptimistic: isOptimistic,
+	}, nil
+}
+
 func getSSZBlockPhase0(blk interfaces.ReadOnlySignedBeaconBlock) (*ethpbv2.SSZContainer, error) {
 	phase0Blk, err := blk.PbPhase0Block()
 	if err != nil {
@@ -1012,6 +1098,82 @@ func (bs *Server) getSSZBlockCapella(ctx context.Context, blk interfaces.ReadOnl
 	return &ethpbv2.SSZContainer{Version: ethpbv2.Version_CAPELLA, ExecutionOptimistic: isOptimistic, Data: sszData}, nil
 }
 
+func (bs *Server) getSSZBlockDeneb(ctx context.Context, blk interfaces.ReadOnlySignedBeaconBlock) (*ethpbv2.SSZContainer, error) {
+	denebBlk, err := blk.PbDenebBlock()
+	if err != nil {
+		// ErrUnsupportedGetter means that we have another block type
+		if errors.Is(err, blocks.ErrUnsupportedGetter) {
+			if blindedDenebBlk, err := blk.PbBlindedDenebBlock(); err == nil {
+				if blindedDenebBlk == nil {
+					return nil, errNilBlock
+				}
+				signedFullBlock, err := bs.ExecutionPayloadReconstructor.ReconstructFullBlock(ctx, blk)
+				if err != nil {
+					return nil, errors.Wrapf(err, "could not reconstruct full execution payload to create signed beacon block")
+				}
+				denebBlk, err = signedFullBlock.PbDenebBlock()
+				if err != nil {
+					return nil, errors.Wrapf(err, "could not get signed beacon block")
+				}
+				v2Blk, err := migration.V1Alpha1BeaconBlockDenebToV2(denebBlk.Block)
+				if err != nil {
+					return nil, errors.Wrapf(err, "could not convert signed beacon block")
+				}
+				root, err := blk.Block().HashTreeRoot()
+				if err != nil {
+					return nil, errors.Wrapf(err, "could not get block root")
+				}
+				isOptimistic, err := bs.OptimisticModeFetcher.IsOptimisticForRoot(ctx, root)
+				if err != nil {
+					return nil, errors.Wrapf(err, "could not check if block is optimistic")
+				}
+				sig := blk.Signature()
+				data := &ethpbv2.SignedBeaconBlockDeneb{
+					Message:   v2Blk,
+					Signature: sig[:],
+				}
+				sszData, err := data.MarshalSSZ()
+				if err != nil {
+					return nil, errors.Wrapf(err, "could not marshal block into SSZ")
+				}
+				return &ethpbv2.SSZContainer{
+					Version:             ethpbv2.Version_Deneb,
+					ExecutionOptimistic: isOptimistic,
+					Data:                sszData,
+				}, nil
+			}
+			return nil, err
+		}
+		return nil, err
+	}
+
+	if denebBlk == nil {
+		return nil, errNilBlock
+	}
+	v2Blk, err := migration.V1Alpha1BeaconBlockDenebToV2(denebBlk.Block)
+	if err != nil {
+		return nil, errors.Wrapf(err, "could not convert signed beacon block")
+	}
+	root, err := blk.Block().HashTreeRoot()
+	if err != nil {
+		return nil, errors.Wrapf(err, "could not get block root")
+	}
+	isOptimistic, err := bs.OptimisticModeFetcher.IsOptimisticForRoot(ctx, root)
+	if err != nil {
+		return nil, errors.Wrapf(err, "could not check if block is optimistic")
+	}
+	sig := blk.Signature()
+	data := &ethpbv2.SignedBeaconBlockDeneb{
+		Message:   v2Blk,
+		Signature: sig[:],
+	}
+	sszData, err := data.MarshalSSZ()
+	if err != nil {
+		return nil, errors.Wrapf(err, "could not marshal block into SSZ")
+	}
+	return &ethpbv2.SSZContainer{Version: ethpbv2.Version_Deneb, ExecutionOptimistic: isOptimistic, Data: sszData}, nil
+}
+
 func (bs *Server) submitPhase0Block(ctx context.Context, phase0Blk *ethpbv1.BeaconBlock, sig []byte) error {
 	v1alpha1Blk, err := migration.V1ToV1Alpha1SignedBlock(&ethpbv1.SignedBeaconBlock{Block: phase0Blk, Signature: sig})
 	if err != nil {

beacon-chain/rpc/eth/beacon/config_test.go

@@ -104,6 +104,8 @@ func TestGetSpec(t *testing.T) {
 	config.MaxWithdrawalsPerPayload = 74
 	config.MaxBlsToExecutionChanges = 75
 	config.MaxValidatorsPerWithdrawalsSweep = 76
+	config.DenebForkEpoch = 77
+	config.DenebForkVersion = []byte("DenebForkVersion")
 
 	var dbp [4]byte
 	copy(dbp[:], []byte{'0', '0', '0', '1'})
@@ -129,6 +131,9 @@ func TestGetSpec(t *testing.T) {
 	var dam [4]byte
 	copy(dam[:], []byte{'1', '0', '0', '0'})
 	config.DomainApplicationMask = dam
+	var dbs [4]byte
+	copy(dbs[:], []byte{'0', '0', '0', '8'})
+	config.DomainBlobSidecar = dbs
 
 	params.OverrideBeaconConfig(config)
 
@@ -136,7 +141,7 @@ func TestGetSpec(t *testing.T) {
 	resp, err := server.GetSpec(context.Background(), &emptypb.Empty{})
 	require.NoError(t, err)
 
-	assert.Equal(t, 105, len(resp.Data))
+	assert.Equal(t, 108, len(resp.Data))
 	for k, v := range resp.Data {
 		switch k {
 		case "CONFIG_NAME":
@@ -362,8 +367,14 @@ func TestGetSpec(t *testing.T) {
 		case "REORG_WEIGHT_THRESHOLD":
 			assert.Equal(t, "20", v)
 		case "SAFE_SLOTS_TO_IMPORT_OPTIMISTICALLY":
+		case "DENEB_FORK_EPOCH":
+			assert.Equal(t, "77", v)
+		case "DENEB_FORK_VERSION":
+			assert.Equal(t, "0x"+hex.EncodeToString([]byte("DenebForkVersion")), v)
+		case "DOMAIN_BLOB_SIDECAR":
+			assert.Equal(t, "0x30303038", v)
 		default:
-			t.Errorf("Incorrect key: %s", k)
+			t.Errorf("Unknown key: %s", k)
 		}
 	}
 }

beacon-chain/rpc/eth/debug/debug.go

@@ -104,6 +104,19 @@ func (ds *Server) GetBeaconStateV2(ctx context.Context, req *ethpbv2.BeaconState
 			ExecutionOptimistic: isOptimistic,
 			Finalized:           isFinalized,
 		}, nil
+	case version.Deneb:
+		protoState, err := migration.BeaconStateDenebToProto(beaconSt)
+		if err != nil {
+			return nil, status.Errorf(codes.Internal, "Could not convert state to proto: %v", err)
+		}
+		return &ethpbv2.BeaconStateResponseV2{
+			Version: ethpbv2.Version_Deneb,
+			Data: &ethpbv2.BeaconStateContainer{
+				State: &ethpbv2.BeaconStateContainer_DenebState{DenebState: protoState},
+			},
+			ExecutionOptimistic: isOptimistic,
+		}, nil
+
 	default:
 		return nil, status.Error(codes.Internal, "Unsupported state version")
 	}
@@ -133,6 +146,8 @@ func (ds *Server) GetBeaconStateSSZV2(ctx context.Context, req *ethpbv2.BeaconSt
 		ver = ethpbv2.Version_BELLATRIX
 	case version.Capella:
 		ver = ethpbv2.Version_CAPELLA
+	case version.Deneb:
+		ver = ethpbv2.Version_Deneb
 	default:
 		return nil, status.Error(codes.Internal, "Unsupported state version")
 	}

beacon-chain/rpc/eth/validator/BUILD.bazel

@@ -16,6 +16,7 @@ go_library(
         "//beacon-chain/db:go_default_library",
         "//beacon-chain/db/kv:go_default_library",
         "//beacon-chain/operations/attestations:go_default_library",
+        "//beacon-chain/operations/blstoexec:go_default_library",
         "//beacon-chain/operations/synccommittee:go_default_library",
         "//beacon-chain/p2p:go_default_library",
         "//beacon-chain/rpc/eth/helpers:go_default_library",

beacon-chain/rpc/eth/validator/server.go

@@ -5,6 +5,7 @@ import (
 	"github.com/prysmaticlabs/prysm/v4/beacon-chain/cache"
 	"github.com/prysmaticlabs/prysm/v4/beacon-chain/db"
 	"github.com/prysmaticlabs/prysm/v4/beacon-chain/operations/attestations"
+	"github.com/prysmaticlabs/prysm/v4/beacon-chain/operations/blstoexec"
 	"github.com/prysmaticlabs/prysm/v4/beacon-chain/operations/synccommittee"
 	"github.com/prysmaticlabs/prysm/v4/beacon-chain/p2p"
 	v1alpha1validator "github.com/prysmaticlabs/prysm/v4/beacon-chain/rpc/prysm/v1alpha1/validator"
@@ -25,6 +26,7 @@ type Server struct {
 	StateFetcher           statefetcher.Fetcher
 	OptimisticModeFetcher  blockchain.OptimisticModeFetcher
 	SyncCommitteePool      synccommittee.Pool
+	BLSChangesPool         blstoexec.PoolManager
 	V1Alpha1Server         *v1alpha1validator.Server
 	ProposerSlotIndexCache *cache.ProposerPayloadIDsCache
 	ChainInfoFetcher       blockchain.ChainInfoFetcher

beacon-chain/rpc/prysm/v1alpha1/beacon/blocks.go

@@ -122,7 +122,7 @@ func convertToBlockContainer(blk interfaces.ReadOnlySignedBeaconBlock, root [32]
 			}
 			ctr.Block = &ethpb.BeaconBlockContainer_BellatrixBlock{BellatrixBlock: rBlk}
 		}
-	case version.Capella:
+	case version.Capella, version.Deneb:
 		if blk.IsBlinded() {
 			rBlk, err := blk.PbBlindedCapellaBlock()
 			if err != nil {

beacon-chain/rpc/prysm/v1alpha1/validator/BUILD.bazel

@@ -45,6 +45,7 @@ go_library(
         "//beacon-chain/core/signing:go_default_library",
         "//beacon-chain/core/time:go_default_library",
         "//beacon-chain/core/transition:go_default_library",
+        "//beacon-chain/core/transition/interop:go_default_library",
         "//beacon-chain/core/validators:go_default_library",
         "//beacon-chain/db:go_default_library",
         "//beacon-chain/db/kv:go_default_library",
@@ -85,6 +86,7 @@ go_library(
         "//time/slots:go_default_library",
         "@com_github_ethereum_go_ethereum//common:go_default_library",
         "@com_github_ethereum_go_ethereum//common/hexutil:go_default_library",
+        "@com_github_ethereum_go_ethereum//core/types:go_default_library",
         "@com_github_pkg_errors//:go_default_library",
         "@com_github_prometheus_client_golang//prometheus:go_default_library",
         "@com_github_prometheus_client_golang//prometheus/promauto:go_default_library",

beacon-chain/rpc/prysm/v1alpha1/validator/blocks.go

@@ -100,6 +100,17 @@ func sendVerifiedBlocks(stream ethpb.BeaconNodeValidator_StreamBlocksAltairServe
 			return nil
 		}
 		b.Block = &ethpb.StreamBlocksResponse_CapellaBlock{CapellaBlock: phBlk}
+	case version.Deneb:
+		pb, err := data.SignedBlock.Proto()
+		if err != nil {
+			return errors.Wrap(err, "could not get protobuf block")
+		}
+		phBlk, ok := pb.(*ethpb.SignedBeaconBlockDeneb)
+		if !ok {
+			log.Warn("Mismatch between version and block type, was expecting SignedBeaconBlockDeneb")
+			return nil
+		}
+		b.Block = &ethpb.StreamBlocksResponse_DenebBlock{DenebBlock: phBlk}
 	}
 
 	if err := stream.Send(b); err != nil {
@@ -149,6 +160,8 @@ func (vs *Server) sendBlocks(stream ethpb.BeaconNodeValidator_StreamBlocksAltair
 		b.Block = &ethpb.StreamBlocksResponse_BellatrixBlock{BellatrixBlock: p}
 	case *ethpb.SignedBeaconBlockCapella:
 		b.Block = &ethpb.StreamBlocksResponse_CapellaBlock{CapellaBlock: p}
+	case *ethpb.SignedBeaconBlockDeneb:
+		b.Block = &ethpb.StreamBlocksResponse_DenebBlock{DenebBlock: p}
 	default:
 		log.Errorf("Unknown block type %T", p)
 	}

beacon-chain/rpc/prysm/v1alpha1/validator/proposer.go

@@ -9,6 +9,7 @@ import (
 
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/common/hexutil"
+	"github.com/ethereum/go-ethereum/core/types"
 	emptypb "github.com/golang/protobuf/ptypes/empty"
 	"github.com/pkg/errors"
 	"github.com/prysmaticlabs/prysm/v4/beacon-chain/blockchain"
@@ -17,6 +18,7 @@ import (
 	blockfeed "github.com/prysmaticlabs/prysm/v4/beacon-chain/core/feed/block"
 	"github.com/prysmaticlabs/prysm/v4/beacon-chain/core/helpers"
 	"github.com/prysmaticlabs/prysm/v4/beacon-chain/core/transition"
+	"github.com/prysmaticlabs/prysm/v4/beacon-chain/core/transition/interop"
 	"github.com/prysmaticlabs/prysm/v4/beacon-chain/db/kv"
 	"github.com/prysmaticlabs/prysm/v4/config/params"
 	"github.com/prysmaticlabs/prysm/v4/consensus-types/blocks"
@@ -24,6 +26,7 @@ import (
 	"github.com/prysmaticlabs/prysm/v4/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/v4/encoding/bytesutil"
 	ethpb "github.com/prysmaticlabs/prysm/v4/proto/prysm/v1alpha1"
+	"github.com/prysmaticlabs/prysm/v4/runtime/version"
 	"github.com/prysmaticlabs/prysm/v4/time/slots"
 	"github.com/sirupsen/logrus"
 	"go.opencensus.io/trace"
@@ -122,7 +125,8 @@ func (vs *Server) GetBeaconBlock(ctx context.Context, req *ethpb.BlockRequest) (
 	vs.setSyncAggregate(ctx, sBlk)
 
 	// Set execution data. New in Bellatrix.
-	if err := vs.setExecutionData(ctx, sBlk, head); err != nil {
+	blobs, err := vs.setExecutionData(ctx, sBlk, head)
+	if err != nil {
 		return nil, status.Errorf(codes.Internal, "Could not set execution data: %v", err)
 	}
 
@@ -131,6 +135,7 @@ func (vs *Server) GetBeaconBlock(ctx context.Context, req *ethpb.BlockRequest) (
 
 	sr, err := vs.computeStateRoot(ctx, sBlk)
 	if err != nil {
+		interop.WriteBlockToDisk(sBlk, true /*failed*/)
 		return nil, status.Errorf(codes.Internal, "Could not compute state root: %v", err)
 	}
 	sBlk.SetStateRoot(sr)
@@ -139,6 +144,50 @@ func (vs *Server) GetBeaconBlock(ctx context.Context, req *ethpb.BlockRequest) (
 	if err != nil {
 		return nil, status.Errorf(codes.Internal, "Could not convert block to proto: %v", err)
 	}
+	if slots.ToEpoch(req.Slot) >= params.BeaconConfig().DenebForkEpoch {
+		blk, ok := pb.(*ethpb.BeaconBlockDeneb)
+		if !ok {
+			return nil, status.Errorf(codes.Internal, "Could not cast block to BeaconBlockDeneb")
+		}
+		br, err := blk.HashTreeRoot()
+		if err != nil {
+			return nil, status.Errorf(codes.Internal, "Could not get block root: %v", err)
+		}
+
+		validatorBlobs := make([]*ethpb.BlobSidecar, len(blk.Body.BlobKzgCommitments))
+		var gethBlobs types.Blobs
+		for _, b := range blobs {
+			var gethBlob types.Blob
+			copy(gethBlob[:], b.Data)
+			gethBlobs = append(gethBlobs, gethBlob)
+		}
+
+		// TODO(Potuz):
+		// - Currently using `ComputeCommitmentsAndProofs` from Geth. Is this ok?
+		// - Add a defensive check if block's kzg commitments align with blobs. If fails, we continue and skip blob.
+
+		commitments, _, proofs, err := gethBlobs.ComputeCommitmentsAndProofs()
+		if err != nil {
+			return nil, status.Errorf(codes.Internal, "Could not compute commitments and proofs: %v", err)
+		}
+		for i, b := range blobs {
+			validatorBlobs[i] = &ethpb.BlobSidecar{
+				BlockRoot:       br[:],
+				Index:           uint64(i),
+				Slot:            blk.Slot,
+				BlockParentRoot: blk.ParentRoot,
+				ProposerIndex:   blk.ProposerIndex,
+				Blob:            b,
+				KzgCommitment:   commitments[i][:],
+				KzgProof:        proofs[i][:],
+			}
+		}
+		blkAndBlobs := &ethpb.BeaconBlockDenebAndBlobs{
+			Block: blk,
+			Blobs: validatorBlobs,
+		}
+		return &ethpb.GenericBeaconBlock{Block: &ethpb.GenericBeaconBlock_Deneb{Deneb: blkAndBlobs}}, nil
+	}
 	if slots.ToEpoch(req.Slot) >= params.BeaconConfig().CapellaForkEpoch {
 		if sBlk.IsBlinded() {
 			return &ethpb.GenericBeaconBlock{Block: &ethpb.GenericBeaconBlock_BlindedCapella{BlindedCapella: pb.(*ethpb.BlindedBeaconBlockCapella)}}, nil
@@ -162,11 +211,7 @@ func (vs *Server) GetBeaconBlock(ctx context.Context, req *ethpb.BlockRequest) (
 func (vs *Server) ProposeBeaconBlock(ctx context.Context, req *ethpb.GenericSignedBeaconBlock) (*ethpb.ProposeResponse, error) {
 	ctx, span := trace.StartSpan(ctx, "ProposerServer.ProposeBeaconBlock")
 	defer span.End()
-	blk, err := blocks.NewSignedBeaconBlock(req.Block)
-	if err != nil {
-		return nil, status.Errorf(codes.InvalidArgument, "Could not decode block: %v", err)
-	}
-	return vs.proposeGenericBeaconBlock(ctx, blk)
+	return vs.proposeGenericBeaconBlock(ctx, req)
 }
 
 // PrepareBeaconProposer caches and updates the fee recipient for the given proposer.
@@ -249,9 +294,15 @@ func (vs *Server) GetFeeRecipientByPubKey(ctx context.Context, request *ethpb.Fe
 	}, nil
 }
 
-func (vs *Server) proposeGenericBeaconBlock(ctx context.Context, blk interfaces.ReadOnlySignedBeaconBlock) (*ethpb.ProposeResponse, error) {
+func (vs *Server) proposeGenericBeaconBlock(ctx context.Context, req *ethpb.GenericSignedBeaconBlock) (*ethpb.ProposeResponse, error) {
 	ctx, span := trace.StartSpan(ctx, "ProposerServer.proposeGenericBeaconBlock")
 	defer span.End()
+
+	blk, err := blocks.NewSignedBeaconBlock(req.Block)
+	if err != nil {
+		return nil, status.Errorf(codes.InvalidArgument, "Could not decode block: %v", err)
+	}
+
 	root, err := blk.Block().HashTreeRoot()
 	if err != nil {
 		return nil, fmt.Errorf("could not tree hash block: %v", err)
@@ -269,16 +320,6 @@ func (vs *Server) proposeGenericBeaconBlock(ctx context.Context, blk interfaces.
 		}
 	}
 
-	// Do not block proposal critical path with debug logging or block feed updates.
-	defer func() {
-		log.WithField("blockRoot", fmt.Sprintf("%#x", bytesutil.Trunc(root[:]))).Debugf(
-			"Block proposal received via RPC")
-		vs.BlockNotifier.BlockFeed().Send(&feed.Event{
-			Type: blockfeed.ReceivedBlock,
-			Data: &blockfeed.ReceivedBlockData{SignedBlock: blk},
-		})
-	}()
-
 	// Broadcast the new block to the network.
 	blkPb, err := blk.Proto()
 	if err != nil {
@@ -295,6 +336,28 @@ func (vs *Server) proposeGenericBeaconBlock(ctx context.Context, blk interfaces.
 		return nil, fmt.Errorf("could not process beacon block: %v", err)
 	}
 
+	if blk.Version() >= version.Deneb {
+		b, ok := req.GetBlock().(*ethpb.GenericSignedBeaconBlock_Deneb)
+		if !ok {
+			return nil, status.Error(codes.Internal, "Could not cast block to Deneb")
+		}
+		for _, sidecar := range b.Deneb.Blobs {
+			if err := vs.P2P.BroadcastBlob(ctx, sidecar.Message.Index, sidecar); err != nil {
+				return nil, errors.Wrap(err, "could not broadcast blob sidecar")
+			}
+		}
+	}
+
+	// Do not block proposal critical path with debug logging or block feed updates.
+	defer func() {
+		log.WithField("blockRoot", fmt.Sprintf("%#x", bytesutil.Trunc(root[:]))).Debugf(
+			"Block proposal received via RPC")
+		vs.BlockNotifier.BlockFeed().Send(&feed.Event{
+			Type: blockfeed.ReceivedBlock,
+			Data: &blockfeed.ReceivedBlockData{SignedBlock: blk},
+		})
+	}()
+
 	return &ethpb.ProposeResponse{
 		BlockRoot: root[:],
 	}, nil

beacon-chain/rpc/prysm/v1alpha1/validator/proposer_attestations.go

@@ -80,7 +80,7 @@ func (vs *Server) packAttestations(ctx context.Context, latestState state.Beacon
 // filter separates attestation list into two groups: valid and invalid attestations.
 // The first group passes the all the required checks for attestation to be considered for proposing.
 // And attestations from the second group should be deleted.
-func (a proposerAtts) filter(ctx context.Context, st state.BeaconState) (proposerAtts, proposerAtts) {
+func (a proposerAtts) filter(ctx context.Context, st state.BeaconState) (proposerAtts, proposerAtts, error) {
 	validAtts := make([]*ethpb.Attestation, 0, len(a))
 	invalidAtts := make([]*ethpb.Attestation, 0, len(a))
 	var attestationProcessor func(context.Context, state.BeaconState, *ethpb.Attestation) (state.BeaconState, error)
@@ -98,7 +98,7 @@ func (a proposerAtts) filter(ctx context.Context, st state.BeaconState) (propose
 		}
 	} else {
 		// Exit early if there is an unknown state type.
-		return validAtts, invalidAtts
+		return validAtts, invalidAtts, errors.Errorf("unknown state type: %v", st.Version())
 	}
 
 	for _, att := range a {
@@ -108,7 +108,7 @@ func (a proposerAtts) filter(ctx context.Context, st state.BeaconState) (propose
 		}
 		invalidAtts = append(invalidAtts, att)
 	}
-	return validAtts, invalidAtts
+	return validAtts, invalidAtts, nil
 }
 
 // sortByProfitability orders attestations by highest slot and by highest aggregation bit count.
@@ -247,7 +247,10 @@ func (vs *Server) validateAndDeleteAttsInPool(ctx context.Context, st state.Beac
 	ctx, span := trace.StartSpan(ctx, "ProposerServer.validateAndDeleteAttsInPool")
 	defer span.End()
 
-	validAtts, invalidAtts := proposerAtts(atts).filter(ctx, st)
+	validAtts, invalidAtts, err := proposerAtts(atts).filter(ctx, st)
+	if err != nil {
+		return nil, err
+	}
 	if err := vs.deleteAttsInPool(ctx, invalidAtts); err != nil {
 		return nil, err
 	}

beacon-chain/rpc/prysm/v1alpha1/validator/proposer_bellatrix.go

@@ -37,11 +37,11 @@ var builderGetPayloadMissCount = promauto.NewCounter(prometheus.CounterOpts{
 const blockBuilderTimeout = 1 * time.Second
 
 // Sets the execution data for the block. Execution data can come from local EL client or remote builder depends on validator registration and circuit breaker conditions.
-func (vs *Server) setExecutionData(ctx context.Context, blk interfaces.SignedBeaconBlock, headState state.BeaconState) error {
+func (vs *Server) setExecutionData(ctx context.Context, blk interfaces.SignedBeaconBlock, headState state.BeaconState) ([]*enginev1.Blob, error) {
 	idx := blk.Block().ProposerIndex()
 	slot := blk.Block().Slot()
 	if slots.ToEpoch(slot) < params.BeaconConfig().BellatrixForkEpoch {
-		return nil
+		return nil, nil
 	}
 
 	canUseBuilder, err := vs.canUseBuilder(ctx, slot, idx)
@@ -55,14 +55,14 @@ func (vs *Server) setExecutionData(ctx context.Context, blk interfaces.SignedBea
 		} else {
 			switch {
 			case blk.Version() >= version.Capella:
-				localPayload, err := vs.getExecutionPayload(ctx, slot, idx, blk.Block().ParentRoot(), headState)
+				localPayload, _, err := vs.getExecutionPayload(ctx, slot, idx, blk.Block().ParentRoot(), headState)
 				if err != nil {
-					return errors.Wrap(err, "failed to get execution payload")
+					return nil, errors.Wrap(err, "failed to get execution payload")
 				}
 				// Compare payload values between local and builder. Default to the local value if it is higher.
 				localValue, err := localPayload.Value()
 				if err != nil {
-					return errors.Wrap(err, "failed to get local payload value")
+					return nil, errors.Wrap(err, "failed to get local payload value")
 				}
 				builderValue, err := builderPayload.Value()
 				if err != nil {
@@ -71,7 +71,7 @@ func (vs *Server) setExecutionData(ctx context.Context, blk interfaces.SignedBea
 
 				withdrawalsMatched, err := matchingWithdrawalsRoot(localPayload, builderPayload)
 				if err != nil {
-					return errors.Wrap(err, "failed to match withdrawals root")
+					return nil, errors.Wrap(err, "failed to match withdrawals root")
 				}
 				// If we can't get the builder value, just use local block.
 				if builderValue.Cmp(localValue) > 0 && withdrawalsMatched { // Builder value is higher and withdrawals match.
@@ -79,31 +79,38 @@ func (vs *Server) setExecutionData(ctx context.Context, blk interfaces.SignedBea
 					if err := blk.SetExecution(builderPayload); err != nil {
 						log.WithError(err).Warn("Proposer: failed to set builder payload")
 					} else {
-						return nil
+						return nil, nil
 					}
 				}
 				log.WithFields(logrus.Fields{
 					"localValue":   localValue,
 					"builderValue": builderValue,
 				}).Warn("Proposer: using local execution payload because higher value")
-				return blk.SetExecution(localPayload)
+				return nil, blk.SetExecution(localPayload)
 			default: // Bellatrix case.
 				blk.SetBlinded(true)
 				if err := blk.SetExecution(builderPayload); err != nil {
 					log.WithError(err).Warn("Proposer: failed to set builder payload")
 				} else {
-					return nil
+					return nil, nil
 				}
 			}
 		}
-
 	}
 
-	executionData, err := vs.getExecutionPayload(ctx, slot, idx, blk.Block().ParentRoot(), headState)
+	executionData, blobsBundle, err := vs.getExecutionPayload(ctx, slot, idx, blk.Block().ParentRoot(), headState)
 	if err != nil {
-		return errors.Wrap(err, "failed to get execution payload")
+		return nil, errors.Wrap(err, "failed to get execution payload")
 	}
-	return blk.SetExecution(executionData)
+	if slots.ToEpoch(slot) >= params.BeaconConfig().DenebForkEpoch && len(blobsBundle.KzgCommitments) > 0 {
+		// TODO: check block hash matches blob bundle hash
+		if err := blk.SetBlobKzgCommitments(blobsBundle.KzgCommitments); err != nil {
+			return nil, errors.Wrap(err, "could not set blob kzg commitments")
+		}
+		return blobsBundle.Blobs, blk.SetExecution(executionData)
+	}
+
+	return nil, blk.SetExecution(executionData)
 }
 
 // This function retrieves the payload header given the slot number and the validator index.
@@ -187,17 +194,17 @@ func (vs *Server) getPayloadHeaderFromBuilder(ctx context.Context, slot primitiv
 		"builderPubKey": fmt.Sprintf("%#x", bid.Pubkey()),
 		"blockHash":     fmt.Sprintf("%#x", header.BlockHash()),
 	}).Info("Received header with bid")
+
 	return header, nil
 }
 
 // This function retrieves the full payload block using the input blind block. This input must be versioned as
 // bellatrix blind block. The output block will contain the full payload. The original header block
 // will be returned the block builder is not configured.
-func (vs *Server) unblindBuilderBlock(ctx context.Context, b interfaces.ReadOnlySignedBeaconBlock) (interfaces.ReadOnlySignedBeaconBlock, error) {
+func (vs *Server) unblindBuilderBlock(ctx context.Context, b interfaces.SignedBeaconBlock) (interfaces.SignedBeaconBlock, error) {
 	if err := consensusblocks.BeaconBlockIsNil(b); err != nil {
 		return nil, err
 	}
-
 	// No-op if the input block is not version blind and bellatrix.
 	if b.Version() != version.Bellatrix || !b.IsBlinded() {
 		return b, nil

beacon-chain/rpc/prysm/v1alpha1/validator/proposer_bellatrix_test.go

@@ -70,7 +70,8 @@ func TestServer_setExecutionData(t *testing.T) {
 	t.Run("No builder configured. Use local block", func(t *testing.T) {
 		blk, err := blocks.NewSignedBeaconBlock(util.NewBeaconBlockCapella())
 		require.NoError(t, err)
-		require.NoError(t, vs.setExecutionData(context.Background(), blk, capellaTransitionState))
+		_, err = vs.setExecutionData(context.Background(), blk, capellaTransitionState)
+		require.NoError(t, err)
 		e, err := blk.Block().Body().Execution()
 		require.NoError(t, err)
 		require.Equal(t, uint64(1), e.BlockNumber()) // Local block
@@ -121,7 +122,8 @@ func TestServer_setExecutionData(t *testing.T) {
 		vs.ForkFetcher.ForkChoicer().SetGenesisTime(uint64(time.Now().Unix()))
 		vs.TimeFetcher = chain
 		vs.HeadFetcher = chain
-		require.NoError(t, vs.setExecutionData(context.Background(), blk, capellaTransitionState))
+		_, err = vs.setExecutionData(context.Background(), blk, capellaTransitionState)
+		require.NoError(t, err)
 		e, err := blk.Block().Body().Execution()
 		require.NoError(t, err)
 		require.Equal(t, uint64(1), e.BlockNumber()) // Local block because incorrect withdrawals
@@ -174,7 +176,8 @@ func TestServer_setExecutionData(t *testing.T) {
 		vs.ForkFetcher.ForkChoicer().SetGenesisTime(uint64(time.Now().Unix()))
 		vs.TimeFetcher = chain
 		vs.HeadFetcher = chain
-		require.NoError(t, vs.setExecutionData(context.Background(), blk, capellaTransitionState))
+		_, err = vs.setExecutionData(context.Background(), blk, capellaTransitionState)
+		require.NoError(t, err)
 		e, err := blk.Block().Body().Execution()
 		require.NoError(t, err)
 		require.Equal(t, uint64(2), e.BlockNumber()) // Builder block
@@ -183,7 +186,8 @@ func TestServer_setExecutionData(t *testing.T) {
 		blk, err := blocks.NewSignedBeaconBlock(util.NewBeaconBlockCapella())
 		require.NoError(t, err)
 		vs.ExecutionEngineCaller = &powtesting.EngineClient{PayloadIDBytes: id, ExecutionPayloadCapella: &v1.ExecutionPayloadCapella{BlockNumber: 3}, BlockValue: big.NewInt(3)}
-		require.NoError(t, vs.setExecutionData(context.Background(), blk, capellaTransitionState))
+		_, err = vs.setExecutionData(context.Background(), blk, capellaTransitionState)
+		require.NoError(t, err)
 		e, err := blk.Block().Body().Execution()
 		require.NoError(t, err)
 		require.Equal(t, uint64(3), e.BlockNumber()) // Local block
@@ -195,7 +199,8 @@ func TestServer_setExecutionData(t *testing.T) {
 			ErrGetHeader: errors.New("fault"),
 		}
 		vs.ExecutionEngineCaller = &powtesting.EngineClient{PayloadIDBytes: id, ExecutionPayloadCapella: &v1.ExecutionPayloadCapella{BlockNumber: 4}, BlockValue: big.NewInt(0)}
-		require.NoError(t, vs.setExecutionData(context.Background(), blk, capellaTransitionState))
+		_, err = vs.setExecutionData(context.Background(), blk, capellaTransitionState)
+		require.NoError(t, err)
 		e, err := blk.Block().Body().Execution()
 		require.NoError(t, err)
 		require.Equal(t, uint64(4), e.BlockNumber()) // Local block
@@ -366,10 +371,10 @@ func TestServer_getBuilderBlock(t *testing.T) {
 
 	tests := []struct {
 		name        string
-		blk         interfaces.ReadOnlySignedBeaconBlock
+		blk         interfaces.SignedBeaconBlock
 		mock        *builderTest.MockBuilderService
 		err         string
-		returnedBlk interfaces.ReadOnlySignedBeaconBlock
+		returnedBlk interfaces.SignedBeaconBlock
 	}{
 		{
 			name: "nil block",
@@ -378,12 +383,12 @@ func TestServer_getBuilderBlock(t *testing.T) {
 		},
 		{
 			name: "old block version",
-			blk: func() interfaces.ReadOnlySignedBeaconBlock {
+			blk: func() interfaces.SignedBeaconBlock {
 				wb, err := blocks.NewSignedBeaconBlock(util.NewBeaconBlock())
 				require.NoError(t, err)
 				return wb
 			}(),
-			returnedBlk: func() interfaces.ReadOnlySignedBeaconBlock {
+			returnedBlk: func() interfaces.SignedBeaconBlock {
 				wb, err := blocks.NewSignedBeaconBlock(util.NewBeaconBlock())
 				require.NoError(t, err)
 				return wb
@@ -391,7 +396,7 @@ func TestServer_getBuilderBlock(t *testing.T) {
 		},
 		{
 			name: "not configured",
-			blk: func() interfaces.ReadOnlySignedBeaconBlock {
+			blk: func() interfaces.SignedBeaconBlock {
 				wb, err := blocks.NewSignedBeaconBlock(util.NewBlindedBeaconBlockBellatrix())
 				require.NoError(t, err)
 				return wb
@@ -399,7 +404,7 @@ func TestServer_getBuilderBlock(t *testing.T) {
 			mock: &builderTest.MockBuilderService{
 				HasConfigured: false,
 			},
-			returnedBlk: func() interfaces.ReadOnlySignedBeaconBlock {
+			returnedBlk: func() interfaces.SignedBeaconBlock {
 				wb, err := blocks.NewSignedBeaconBlock(util.NewBlindedBeaconBlockBellatrix())
 				require.NoError(t, err)
 				return wb
@@ -407,7 +412,7 @@ func TestServer_getBuilderBlock(t *testing.T) {
 		},
 		{
 			name: "submit blind block error",
-			blk: func() interfaces.ReadOnlySignedBeaconBlock {
+			blk: func() interfaces.SignedBeaconBlock {
 				b := util.NewBlindedBeaconBlockBellatrix()
 				b.Block.Slot = 1
 				b.Block.ProposerIndex = 2
@@ -424,7 +429,7 @@ func TestServer_getBuilderBlock(t *testing.T) {
 		},
 		{
 			name: "head and payload root mismatch",
-			blk: func() interfaces.ReadOnlySignedBeaconBlock {
+			blk: func() interfaces.SignedBeaconBlock {
 				b := util.NewBlindedBeaconBlockBellatrix()
 				b.Block.Slot = 1
 				b.Block.ProposerIndex = 2
@@ -436,7 +441,7 @@ func TestServer_getBuilderBlock(t *testing.T) {
 				HasConfigured: true,
 				Payload:       p,
 			},
-			returnedBlk: func() interfaces.ReadOnlySignedBeaconBlock {
+			returnedBlk: func() interfaces.SignedBeaconBlock {
 				b := util.NewBeaconBlockBellatrix()
 				b.Block.Slot = 1
 				b.Block.ProposerIndex = 2
@@ -449,7 +454,7 @@ func TestServer_getBuilderBlock(t *testing.T) {
 		},
 		{
 			name: "can get payload",
-			blk: func() interfaces.ReadOnlySignedBeaconBlock {
+			blk: func() interfaces.SignedBeaconBlock {
 				b := util.NewBlindedBeaconBlockBellatrix()
 				b.Block.Slot = 1
 				b.Block.ProposerIndex = 2
@@ -475,7 +480,7 @@ func TestServer_getBuilderBlock(t *testing.T) {
 				HasConfigured: true,
 				Payload:       p,
 			},
-			returnedBlk: func() interfaces.ReadOnlySignedBeaconBlock {
+			returnedBlk: func() interfaces.SignedBeaconBlock {
 				b := util.NewBeaconBlockBellatrix()
 				b.Block.Slot = 1
 				b.Block.ProposerIndex = 2

beacon-chain/rpc/prysm/v1alpha1/validator/proposer_capella.go

@@ -35,7 +35,7 @@ func (vs *Server) setBlsToExecData(blk interfaces.SignedBeaconBlock, headState s
 	}
 }
 
-func (vs *Server) unblindBuilderBlockCapella(ctx context.Context, b interfaces.ReadOnlySignedBeaconBlock) (interfaces.ReadOnlySignedBeaconBlock, error) {
+func (vs *Server) unblindBuilderBlockCapella(ctx context.Context, b interfaces.SignedBeaconBlock) (interfaces.SignedBeaconBlock, error) {
 	if err := consensusblocks.BeaconBlockIsNil(b); err != nil {
 		return nil, errors.Wrap(err, "block is nil")
 	}

beacon-chain/rpc/prysm/v1alpha1/validator/proposer_capella_test.go

@@ -21,10 +21,10 @@ func TestServer_unblindBuilderCapellaBlock(t *testing.T) {
 
 	tests := []struct {
 		name        string
-		blk         interfaces.ReadOnlySignedBeaconBlock
+		blk         interfaces.SignedBeaconBlock
 		mock        *builderTest.MockBuilderService
 		err         string
-		returnedBlk interfaces.ReadOnlySignedBeaconBlock
+		returnedBlk interfaces.SignedBeaconBlock
 	}{
 		{
 			name: "nil block",
@@ -33,12 +33,12 @@ func TestServer_unblindBuilderCapellaBlock(t *testing.T) {
 		},
 		{
 			name: "old block version",
-			blk: func() interfaces.ReadOnlySignedBeaconBlock {
+			blk: func() interfaces.SignedBeaconBlock {
 				wb, err := blocks.NewSignedBeaconBlock(util.NewBeaconBlock())
 				require.NoError(t, err)
 				return wb
 			}(),
-			returnedBlk: func() interfaces.ReadOnlySignedBeaconBlock {
+			returnedBlk: func() interfaces.SignedBeaconBlock {
 				wb, err := blocks.NewSignedBeaconBlock(util.NewBeaconBlock())
 				require.NoError(t, err)
 				return wb
@@ -46,7 +46,7 @@ func TestServer_unblindBuilderCapellaBlock(t *testing.T) {
 		},
 		{
 			name: "not configured",
-			blk: func() interfaces.ReadOnlySignedBeaconBlock {
+			blk: func() interfaces.SignedBeaconBlock {
 				wb, err := blocks.NewSignedBeaconBlock(util.NewBlindedBeaconBlockBellatrix())
 				require.NoError(t, err)
 				return wb
@@ -54,7 +54,7 @@ func TestServer_unblindBuilderCapellaBlock(t *testing.T) {
 			mock: &builderTest.MockBuilderService{
 				HasConfigured: false,
 			},
-			returnedBlk: func() interfaces.ReadOnlySignedBeaconBlock {
+			returnedBlk: func() interfaces.SignedBeaconBlock {
 				wb, err := blocks.NewSignedBeaconBlock(util.NewBlindedBeaconBlockBellatrix())
 				require.NoError(t, err)
 				return wb
@@ -62,7 +62,7 @@ func TestServer_unblindBuilderCapellaBlock(t *testing.T) {
 		},
 		{
 			name: "submit blind block error",
-			blk: func() interfaces.ReadOnlySignedBeaconBlock {
+			blk: func() interfaces.SignedBeaconBlock {
 				b := util.NewBlindedBeaconBlockCapella()
 				b.Block.Slot = 1
 				b.Block.ProposerIndex = 2
@@ -79,7 +79,7 @@ func TestServer_unblindBuilderCapellaBlock(t *testing.T) {
 		},
 		{
 			name: "can get payload",
-			blk: func() interfaces.ReadOnlySignedBeaconBlock {
+			blk: func() interfaces.SignedBeaconBlock {
 				b := util.NewBlindedBeaconBlockCapella()
 				b.Block.Slot = 1
 				b.Block.ProposerIndex = 2
@@ -108,7 +108,7 @@ func TestServer_unblindBuilderCapellaBlock(t *testing.T) {
 				HasConfigured:  true,
 				PayloadCapella: p,
 			},
-			returnedBlk: func() interfaces.ReadOnlySignedBeaconBlock {
+			returnedBlk: func() interfaces.SignedBeaconBlock {
 				b := util.NewBeaconBlockCapella()
 				b.Block.Slot = 1
 				b.Block.ProposerIndex = 2

beacon-chain/rpc/prysm/v1alpha1/validator/proposer_empty_block.go

@@ -30,11 +30,16 @@ func getEmptyBlock(slot primitives.Slot) (interfaces.SignedBeaconBlock, error) {
 		if err != nil {
 			return nil, status.Errorf(codes.Internal, "Could not initialize block for proposal: %v", err)
 		}
-	default:
+	case slots.ToEpoch(slot) < params.BeaconConfig().DenebForkEpoch:
 		sBlk, err = blocks.NewSignedBeaconBlock(&ethpb.SignedBeaconBlockCapella{Block: &ethpb.BeaconBlockCapella{Body: &ethpb.BeaconBlockBodyCapella{}}})
 		if err != nil {
 			return nil, status.Errorf(codes.Internal, "Could not initialize block for proposal: %v", err)
 		}
+	default:
+		sBlk, err = blocks.NewSignedBeaconBlock(&ethpb.SignedBeaconBlockDeneb{Block: &ethpb.BeaconBlockDeneb{Body: &ethpb.BeaconBlockBodyDeneb{}}})
+		if err != nil {
+			return nil, status.Errorf(codes.Internal, "Could not initialize block for proposal: %v", err)
+		}
 	}
 	return sBlk, err
 }

beacon-chain/rpc/prysm/v1alpha1/validator/proposer_execution_payload.go

@@ -40,9 +40,10 @@ var (
 	})
 )
 
-// This returns the execution payload of a given slot. The function has full awareness of pre and post merge.
+// This returns the execution payload of a given slot.
+// The function has full awareness of pre and post merge.
 // The payload is computed given the respected time of merge.
-func (vs *Server) getExecutionPayload(ctx context.Context, slot primitives.Slot, vIdx primitives.ValidatorIndex, headRoot [32]byte, st state.BeaconState) (interfaces.ExecutionData, error) {
+func (vs *Server) getExecutionPayload(ctx context.Context, slot primitives.Slot, vIdx primitives.ValidatorIndex, headRoot [32]byte, st state.BeaconState) (interfaces.ExecutionData, *enginev1.BlobsBundle, error) {
 	proposerID, payloadId, ok := vs.ProposerSlotIndexCache.GetProposerPayloadIDs(slot, headRoot)
 	feeRecipient := params.BeaconConfig().DefaultFeeRecipient
 	recipient, err := vs.BeaconDB.FeeRecipientByValidatorID(ctx, vIdx)
@@ -62,7 +63,7 @@ func (vs *Server) getExecutionPayload(ctx context.Context, slot primitives.Slot,
 				"Please refer to our documentation for instructions")
 		}
 	default:
-		return nil, errors.Wrap(err, "could not get fee recipient in db")
+		return nil, nil, errors.Wrap(err, "could not get fee recipient in db")
 	}
 
 	if ok && proposerID == vIdx && payloadId != [8]byte{} { // Payload ID is cache hit. Return the cached payload ID.
@@ -73,10 +74,17 @@ func (vs *Server) getExecutionPayload(ctx context.Context, slot primitives.Slot,
 		switch {
 		case err == nil:
 			warnIfFeeRecipientDiffers(payload, feeRecipient)
-			return payload, nil
+			if slots.ToEpoch(slot) >= params.BeaconConfig().DenebForkEpoch {
+				sc, err := vs.ExecutionEngineCaller.GetBlobsBundle(ctx, pid)
+				if err != nil {
+					return nil, nil, errors.Wrap(err, "could not get blobs bundle from execution client")
+				}
+				return payload, sc, nil
+			}
+			return payload, nil, nil
 		case errors.Is(err, context.DeadlineExceeded):
 		default:
-			return nil, errors.Wrap(err, "could not get cached payload from execution client")
+			return nil, nil, errors.Wrap(err, "could not get cached payload from execution client")
 		}
 	}
 
@@ -84,53 +92,61 @@ func (vs *Server) getExecutionPayload(ctx context.Context, slot primitives.Slot,
 	var hasTerminalBlock bool
 	mergeComplete, err := blocks.IsMergeTransitionComplete(st)
 	if err != nil {
-		return nil, err
+		return nil, nil, err
 	}
 
 	t, err := slots.ToTime(st.GenesisTime(), slot)
 	if err != nil {
-		return nil, err
+		return nil, nil, err
 	}
 	if mergeComplete {
 		header, err := st.LatestExecutionPayloadHeader()
 		if err != nil {
-			return nil, err
+			return nil, nil, err
 		}
 		parentHash = header.BlockHash()
 	} else {
 		if activationEpochNotReached(slot) {
-			return consensusblocks.WrappedExecutionPayload(emptyPayload())
+			p, err := consensusblocks.WrappedExecutionPayload(emptyPayload())
+			if err != nil {
+				return nil, nil, err
+			}
+			return p, nil, nil
 		}
 		parentHash, hasTerminalBlock, err = vs.getTerminalBlockHashIfExists(ctx, uint64(t.Unix()))
 		if err != nil {
-			return nil, err
+			return nil, nil, err
 		}
 		if !hasTerminalBlock {
-			return consensusblocks.WrappedExecutionPayload(emptyPayload())
+			p, err := consensusblocks.WrappedExecutionPayload(emptyPayload())
+			if err != nil {
+				return nil, nil, err
+			}
+			return p, nil, nil
 		}
 	}
 	payloadIDCacheMiss.Inc()
 
 	random, err := helpers.RandaoMix(st, time.CurrentEpoch(st))
 	if err != nil {
-		return nil, err
+		return nil, nil, err
 	}
 	finalizedBlockHash := params.BeaconConfig().ZeroHash[:]
 	finalizedRoot := bytesutil.ToBytes32(st.FinalizedCheckpoint().Root)
 	if finalizedRoot != [32]byte{} { // finalized root could be zeros before the first finalized block.
 		finalizedBlock, err := vs.BeaconDB.Block(ctx, bytesutil.ToBytes32(st.FinalizedCheckpoint().Root))
 		if err != nil {
-			return nil, err
+			return nil, nil, err
 		}
 		if err := consensusblocks.BeaconBlockIsNil(finalizedBlock); err != nil {
-			return nil, err
+			return nil, nil, err
 		}
 		switch finalizedBlock.Version() {
 		case version.Phase0, version.Altair: // Blocks before Bellatrix don't have execution payloads. Use zeros as the hash.
 		default:
 			finalizedPayload, err := finalizedBlock.Block().Body().Execution()
 			if err != nil {
-				return nil, err
+				return nil, nil, err
 			}
 			finalizedBlockHash = finalizedPayload.BlockHash()
 		}
@@ -143,10 +159,10 @@ func (vs *Server) getExecutionPayload(ctx context.Context, slot primitives.Slot,
 	}
 	var attr payloadattribute.Attributer
 	switch st.Version() {
-	case version.Capella:
+	case version.Capella, version.Deneb:
 		withdrawals, err := st.ExpectedWithdrawals()
 		if err != nil {
-			return nil, err
+			return nil, nil, err
 		}
 		attr, err = payloadattribute.New(&enginev1.PayloadAttributesV2{
 			Timestamp:             uint64(t.Unix()),
@@ -155,7 +171,7 @@ func (vs *Server) getExecutionPayload(ctx context.Context, slot primitives.Slot,
 			Withdrawals:           withdrawals,
 		})
 		if err != nil {
-			return nil, err
+			return nil, nil, err
 		}
 	case version.Bellatrix:
 		attr, err = payloadattribute.New(&enginev1.PayloadAttributes{
@@ -164,25 +180,32 @@ func (vs *Server) getExecutionPayload(ctx context.Context, slot primitives.Slot,
 			SuggestedFeeRecipient: feeRecipient.Bytes(),
 		})
 		if err != nil {
-			return nil, err
+			return nil, nil, err
 		}
 	default:
-		return nil, errors.New("unknown beacon state version")
+		return nil, nil, errors.New("unknown beacon state version")
 	}
 
 	payloadID, _, err := vs.ExecutionEngineCaller.ForkchoiceUpdated(ctx, f, attr)
 	if err != nil {
-		return nil, errors.Wrap(err, "could not prepare payload")
+		return nil, nil, errors.Wrap(err, "could not prepare payload")
 	}
 	if payloadID == nil {
-		return nil, fmt.Errorf("nil payload with block hash: %#x", parentHash)
+		return nil, nil, fmt.Errorf("nil payload with block hash: %#x", parentHash)
 	}
 	payload, err := vs.ExecutionEngineCaller.GetPayload(ctx, *payloadID, slot)
 	if err != nil {
-		return nil, err
+		return nil, nil, err
 	}
 	warnIfFeeRecipientDiffers(payload, feeRecipient)
-	return payload, nil
+	if slots.ToEpoch(slot) >= params.BeaconConfig().DenebForkEpoch {
+		sc, err := vs.ExecutionEngineCaller.GetBlobsBundle(ctx, *payloadID)
+		if err != nil {
+			return nil, nil, errors.Wrap(err, "could not get blobs bundle from execution client")
+		}
+		return payload, sc, nil
+	}
+	return payload, nil, nil
 }
 
 // warnIfFeeRecipientDiffers logs a warning if the fee recipient in the included payload does not

beacon-chain/rpc/prysm/v1alpha1/validator/proposer_execution_payload_test.go

@@ -143,7 +143,7 @@ func TestServer_getExecutionPayload(t *testing.T) {
 				ProposerSlotIndexCache: cache.NewProposerPayloadIDsCache(),
 			}
 			vs.ProposerSlotIndexCache.SetProposerAndPayloadIDs(tt.st.Slot(), 100, [8]byte{100}, [32]byte{'a'})
-			_, err := vs.getExecutionPayload(context.Background(), tt.st.Slot(), tt.validatorIndx, [32]byte{'a'}, tt.st)
+			_, _, err := vs.getExecutionPayload(context.Background(), tt.st.Slot(), tt.validatorIndx, [32]byte{'a'}, tt.st)
 			if tt.errString != "" {
 				require.ErrorContains(t, tt.errString, err)
 			} else {
@@ -179,7 +179,7 @@ func TestServer_getExecutionPayloadContextTimeout(t *testing.T) {
 	}
 	vs.ProposerSlotIndexCache.SetProposerAndPayloadIDs(nonTransitionSt.Slot(), 100, [8]byte{100}, [32]byte{'a'})
 
-	_, err = vs.getExecutionPayload(context.Background(), nonTransitionSt.Slot(), 100, [32]byte{'a'}, nonTransitionSt)
+	_, _, err = vs.getExecutionPayload(context.Background(), nonTransitionSt.Slot(), 100, [32]byte{'a'}, nonTransitionSt)
 	require.NoError(t, err)
 }
 
@@ -224,7 +224,7 @@ func TestServer_getExecutionPayload_UnexpectedFeeRecipient(t *testing.T) {
 		BeaconDB:               beaconDB,
 		ProposerSlotIndexCache: cache.NewProposerPayloadIDsCache(),
 	}
-	gotPayload, err := vs.getExecutionPayload(context.Background(), transitionSt.Slot(), 0, [32]byte{}, transitionSt)
+	gotPayload, _, err := vs.getExecutionPayload(context.Background(), transitionSt.Slot(), 0, [32]byte{}, transitionSt)
 	require.NoError(t, err)
 	require.NotNil(t, gotPayload)
 
@@ -236,7 +236,7 @@ func TestServer_getExecutionPayload_UnexpectedFeeRecipient(t *testing.T) {
 	payload.FeeRecipient = evilRecipientAddress[:]
 	vs.ProposerSlotIndexCache = cache.NewProposerPayloadIDsCache()
 
-	gotPayload, err = vs.getExecutionPayload(context.Background(), transitionSt.Slot(), 0, [32]byte{}, transitionSt)
+	gotPayload, _, err = vs.getExecutionPayload(context.Background(), transitionSt.Slot(), 0, [32]byte{}, transitionSt)
 	require.NoError(t, err)
 	require.NotNil(t, gotPayload)
 

beacon-chain/state/state-native/beacon_state_mainnet.go

@@ -48,6 +48,7 @@ type BeaconState struct {
 	nextSyncCommittee                   *ethpb.SyncCommittee
 	latestExecutionPayloadHeader        *enginev1.ExecutionPayloadHeader
 	latestExecutionPayloadHeaderCapella *enginev1.ExecutionPayloadHeaderCapella
+	latestExecutionPayloadHeaderDeneb   *enginev1.ExecutionPayloadHeaderDeneb
 	nextWithdrawalIndex                 uint64
 	nextWithdrawalValidatorIndex        primitives.ValidatorIndex
 

beacon-chain/state/state-native/beacon_state_minimal.go

@@ -48,6 +48,7 @@ type BeaconState struct {
 	nextSyncCommittee                   *ethpb.SyncCommittee
 	latestExecutionPayloadHeader        *enginev1.ExecutionPayloadHeader
 	latestExecutionPayloadHeaderCapella *enginev1.ExecutionPayloadHeaderCapella
+	latestExecutionPayloadHeaderDeneb   *enginev1.ExecutionPayloadHeaderDeneb
 	nextWithdrawalIndex                 uint64
 	nextWithdrawalValidatorIndex        primitives.ValidatorIndex
 

beacon-chain/state/state-native/getters_payload_header.go

@@ -22,7 +22,12 @@ func (b *BeaconState) LatestExecutionPayloadHeader() (interfaces.ExecutionData,
 	if b.version == version.Bellatrix {
 		return blocks.WrappedExecutionPayloadHeader(b.latestExecutionPayloadHeaderVal())
 	}
-	return blocks.WrappedExecutionPayloadHeaderCapella(b.latestExecutionPayloadHeaderCapellaVal(), big.NewInt(0))
+
+	if b.version == version.Capella {
+		return blocks.WrappedExecutionPayloadHeaderCapella(b.latestExecutionPayloadHeaderCapellaVal(), big.NewInt(0))
+	}
+
+	return blocks.WrappedExecutionPayloadHeaderDeneb(b.latestExecutionPayloadHeaderDenebVal(), big.NewInt(0))
 }
 
 // latestExecutionPayloadHeaderVal of the beacon state.
@@ -36,3 +41,7 @@ func (b *BeaconState) latestExecutionPayloadHeaderVal() *enginev1.ExecutionPaylo
 func (b *BeaconState) latestExecutionPayloadHeaderCapellaVal() *enginev1.ExecutionPayloadHeaderCapella {
 	return ethpb.CopyExecutionPayloadHeaderCapella(b.latestExecutionPayloadHeaderCapella)
 }
+
+func (b *BeaconState) latestExecutionPayloadHeaderDenebVal() *enginev1.ExecutionPayloadHeaderDeneb {
+	return ethpb.CopyExecutionPayloadHeaderDeneb(b.latestExecutionPayloadHeaderDeneb)
+}

beacon-chain/state/state-native/getters_state.go

@@ -128,6 +128,37 @@ func (b *BeaconState) ToProtoUnsafe() interface{} {
 			NextWithdrawalValidatorIndex: b.nextWithdrawalValidatorIndex,
 			HistoricalSummaries:          b.historicalSummaries,
 		}
+	case version.Deneb:
+		return &ethpb.BeaconStateDeneb{
+			GenesisTime:                  b.genesisTime,
+			GenesisValidatorsRoot:        gvrCopy[:],
+			Slot:                         b.slot,
+			Fork:                         b.fork,
+			LatestBlockHeader:            b.latestBlockHeader,
+			BlockRoots:                   b.blockRoots.Slice(),
+			StateRoots:                   b.stateRoots.Slice(),
+			HistoricalRoots:              b.historicalRoots.Slice(),
+			Eth1Data:                     b.eth1Data,
+			Eth1DataVotes:                b.eth1DataVotes,
+			Eth1DepositIndex:             b.eth1DepositIndex,
+			Validators:                   b.validators,
+			Balances:                     b.balances,
+			RandaoMixes:                  b.randaoMixes.Slice(),
+			Slashings:                    b.slashings,
+			PreviousEpochParticipation:   b.previousEpochParticipation,
+			CurrentEpochParticipation:    b.currentEpochParticipation,
+			JustificationBits:            b.justificationBits,
+			PreviousJustifiedCheckpoint:  b.previousJustifiedCheckpoint,
+			CurrentJustifiedCheckpoint:   b.currentJustifiedCheckpoint,
+			FinalizedCheckpoint:          b.finalizedCheckpoint,
+			InactivityScores:             b.inactivityScores,
+			CurrentSyncCommittee:         b.currentSyncCommittee,
+			NextSyncCommittee:            b.nextSyncCommittee,
+			LatestExecutionPayloadHeader: b.latestExecutionPayloadHeaderDeneb,
+			NextWithdrawalIndex:          b.nextWithdrawalIndex,
+			NextWithdrawalValidatorIndex: b.nextWithdrawalValidatorIndex,
+			HistoricalSummaries:          b.historicalSummaries,
+		}
 	default:
 		return nil
 	}
@@ -255,6 +286,37 @@ func (b *BeaconState) ToProto() interface{} {
 			NextWithdrawalValidatorIndex: b.nextWithdrawalValidatorIndex,
 			HistoricalSummaries:          b.historicalSummariesVal(),
 		}
+	case version.Deneb:
+		return &ethpb.BeaconStateDeneb{
+			GenesisTime:                  b.genesisTime,
+			GenesisValidatorsRoot:        gvrCopy[:],
+			Slot:                         b.slot,
+			Fork:                         b.forkVal(),
+			LatestBlockHeader:            b.latestBlockHeaderVal(),
+			BlockRoots:                   b.blockRoots.Slice(),
+			StateRoots:                   b.stateRoots.Slice(),
+			HistoricalRoots:              b.historicalRoots.Slice(),
+			Eth1Data:                     b.eth1DataVal(),
+			Eth1DataVotes:                b.eth1DataVotesVal(),
+			Eth1DepositIndex:             b.eth1DepositIndex,
+			Validators:                   b.validatorsVal(),
+			Balances:                     b.balancesVal(),
+			RandaoMixes:                  b.randaoMixes.Slice(),
+			Slashings:                    b.slashingsVal(),
+			PreviousEpochParticipation:   b.previousEpochParticipationVal(),
+			CurrentEpochParticipation:    b.currentEpochParticipationVal(),
+			JustificationBits:            b.justificationBitsVal(),
+			PreviousJustifiedCheckpoint:  b.previousJustifiedCheckpointVal(),
+			CurrentJustifiedCheckpoint:   b.currentJustifiedCheckpointVal(),
+			FinalizedCheckpoint:          b.finalizedCheckpointVal(),
+			InactivityScores:             b.inactivityScoresVal(),
+			CurrentSyncCommittee:         b.currentSyncCommitteeVal(),
+			NextSyncCommittee:            b.nextSyncCommitteeVal(),
+			LatestExecutionPayloadHeader: b.latestExecutionPayloadHeaderDenebVal(),
+			NextWithdrawalIndex:          b.nextWithdrawalIndex,
+			NextWithdrawalValidatorIndex: b.nextWithdrawalValidatorIndex,
+			HistoricalSummaries:          b.historicalSummariesVal(),
+		}
 	default:
 		return nil
 	}
@@ -338,3 +400,11 @@ func ProtobufBeaconStateCapella(s interface{}) (*ethpb.BeaconStateCapella, error
 	}
 	return pbState, nil
 }
+
+func ProtobufBeaconStateDeneb(s interface{}) (*ethpb.BeaconStateDeneb, error) {
+	pbState, ok := s.(*ethpb.BeaconStateDeneb)
+	if !ok {
+		return nil, errors.New("input is not type pb.BeaconStateCapella")
+	}
+	return pbState, nil
+}

beacon-chain/state/state-native/hasher.go

@@ -35,6 +35,8 @@ func ComputeFieldRootsWithHasher(ctx context.Context, state *BeaconState) ([][]b
 		fieldRoots = make([][]byte, params.BeaconConfig().BeaconStateBellatrixFieldCount)
 	case version.Capella:
 		fieldRoots = make([][]byte, params.BeaconConfig().BeaconStateCapellaFieldCount)
+	case version.Deneb:
+		fieldRoots = make([][]byte, params.BeaconConfig().BeaconStateCapellaFieldCount)
 	}
 
 	// Genesis time root.
@@ -264,5 +266,31 @@ func ComputeFieldRootsWithHasher(ctx context.Context, state *BeaconState) ([][]b
 		fieldRoots[types.HistoricalSummaries.RealPosition()] = historicalSummaryRoot[:]
 	}
 
+	if state.version == version.Deneb {
+		// Execution payload root.
+		executionPayloadRoot, err := state.latestExecutionPayloadHeaderDeneb.HashTreeRoot()
+		if err != nil {
+			return nil, err
+		}
+		fieldRoots[types.LatestExecutionPayloadHeaderDeneb.RealPosition()] = executionPayloadRoot[:]
+
+		// Next withdrawal index root.
+		nextWithdrawalIndexRoot := make([]byte, 32)
+		binary.LittleEndian.PutUint64(nextWithdrawalIndexRoot, state.nextWithdrawalIndex)
+		fieldRoots[types.NextWithdrawalIndex.RealPosition()] = nextWithdrawalIndexRoot
+
+		// Next partial withdrawal validator index root.
+		nextWithdrawalValidatorIndexRoot := make([]byte, 32)
+		binary.LittleEndian.PutUint64(nextWithdrawalValidatorIndexRoot, uint64(state.nextWithdrawalValidatorIndex))
+		fieldRoots[types.NextWithdrawalValidatorIndex.RealPosition()] = nextWithdrawalValidatorIndexRoot
+
+		// Historical summary root.
+		historicalSummaryRoot, err := stateutil.HistoricalSummariesRoot(state.historicalSummaries)
+		if err != nil {
+			return nil, errors.Wrap(err, "could not compute historical summary merkleization")
+		}
+		fieldRoots[types.HistoricalSummaries.RealPosition()] = historicalSummaryRoot[:]
+	}
+
 	return fieldRoots, nil
 }

beacon-chain/state/state-native/setters_payload_header.go

@@ -36,6 +36,14 @@ func (b *BeaconState) SetLatestExecutionPayloadHeader(val interfaces.ExecutionDa
 		b.latestExecutionPayloadHeaderCapella = latest
 		b.markFieldAsDirty(types.LatestExecutionPayloadHeaderCapella)
 		return nil
+	case *enginev1.ExecutionPayloadDeneb:
+		latest, err := consensusblocks.PayloadToHeaderDeneb(val)
+		if err != nil {
+			return errors.Wrap(err, "could not convert payload to header")
+		}
+		b.latestExecutionPayloadHeaderDeneb = latest
+		b.markFieldAsDirty(types.LatestExecutionPayloadHeaderDeneb)
+		return nil
 	case *enginev1.ExecutionPayloadHeader:
 		b.latestExecutionPayloadHeader = header
 		b.markFieldAsDirty(types.LatestExecutionPayloadHeader)
@@ -44,6 +52,10 @@ func (b *BeaconState) SetLatestExecutionPayloadHeader(val interfaces.ExecutionDa
 		b.latestExecutionPayloadHeaderCapella = header
 		b.markFieldAsDirty(types.LatestExecutionPayloadHeaderCapella)
 		return nil
+	case *enginev1.ExecutionPayloadHeaderDeneb:
+		b.latestExecutionPayloadHeaderDeneb = header
+		b.markFieldAsDirty(types.LatestExecutionPayloadHeaderDeneb)
+		return nil
 	default:
 		return errors.New("value must be an execution payload header")
 	}

beacon-chain/state/state-native/spec_parameters.go

@@ -7,7 +7,7 @@ import (
 
 func (b *BeaconState) ProportionalSlashingMultiplier() (uint64, error) {
 	switch b.version {
-	case version.Bellatrix, version.Capella:
+	case version.Bellatrix, version.Capella, version.Deneb:
 		return params.BeaconConfig().ProportionalSlashingMultiplierBellatrix, nil
 	case version.Altair:
 		return params.BeaconConfig().ProportionalSlashingMultiplierAltair, nil
@@ -19,7 +19,7 @@ func (b *BeaconState) ProportionalSlashingMultiplier() (uint64, error) {
 
 func (b *BeaconState) InactivityPenaltyQuotient() (uint64, error) {
 	switch b.version {
-	case version.Bellatrix, version.Capella:
+	case version.Bellatrix, version.Capella, version.Deneb:
 		return params.BeaconConfig().InactivityPenaltyQuotientBellatrix, nil
 	case version.Altair:
 		return params.BeaconConfig().InactivityPenaltyQuotientAltair, nil

beacon-chain/state/state-native/state_trie.go

@@ -84,10 +84,19 @@ var capellaFields = append(
 	types.HistoricalSummaries,
 )
 
+var denebFields = append(
+	altairFields,
+	types.LatestExecutionPayloadHeaderDeneb,
+	types.NextWithdrawalIndex,
+	types.NextWithdrawalValidatorIndex,
+	types.HistoricalSummaries,
+)
+
 const (
 	phase0SharedFieldRefCount    = 10
 	altairSharedFieldRefCount    = 11
 	bellatrixSharedFieldRefCount = 12
+	denebSharedFieldRefCount     = 14
 	capellaSharedFieldRefCount   = 14
 )
 
@@ -111,6 +120,11 @@ func InitializeFromProtoCapella(st *ethpb.BeaconStateCapella) (state.BeaconState
 	return InitializeFromProtoUnsafeCapella(proto.Clone(st).(*ethpb.BeaconStateCapella))
 }
 
+// InitializeFromProtoDeneb the beacon state from a protobuf representation.
+func InitializeFromProtoDeneb(st *ethpb.BeaconStateDeneb) (state.BeaconState, error) {
+	return InitializeFromProtoUnsafeDeneb(proto.Clone(st).(*ethpb.BeaconStateDeneb))
+}
+
 // InitializeFromProtoUnsafePhase0 directly uses the beacon state protobuf fields
 // and sets them as fields of the BeaconState type.
 func InitializeFromProtoUnsafePhase0(st *ethpb.BeaconState) (state.BeaconState, error) {
@@ -475,6 +489,102 @@ func InitializeFromProtoUnsafeCapella(st *ethpb.BeaconStateCapella) (state.Beaco
 	return b, nil
 }
 
+// InitializeFromProtoUnsafeDeneb directly uses the beacon state protobuf fields
+// and sets them as fields of the BeaconState type.
+func InitializeFromProtoUnsafeDeneb(st *ethpb.BeaconStateDeneb) (state.BeaconState, error) {
+	if st == nil {
+		return nil, errors.New("received nil state")
+	}
+
+	var bRoots customtypes.BlockRoots
+	for i, r := range st.BlockRoots {
+		bRoots[i] = bytesutil.ToBytes32(r)
+	}
+	var sRoots customtypes.StateRoots
+	for i, r := range st.StateRoots {
+		sRoots[i] = bytesutil.ToBytes32(r)
+	}
+	hRoots := customtypes.HistoricalRoots(make([][32]byte, len(st.HistoricalRoots)))
+	for i, r := range st.HistoricalRoots {
+		hRoots[i] = bytesutil.ToBytes32(r)
+	}
+	var mixes customtypes.RandaoMixes
+	for i, m := range st.RandaoMixes {
+		mixes[i] = bytesutil.ToBytes32(m)
+	}
+
+	fieldCount := params.BeaconConfig().BeaconStateCapellaFieldCount
+	b := &BeaconState{
+		version:                           version.Deneb,
+		genesisTime:                       st.GenesisTime,
+		genesisValidatorsRoot:             bytesutil.ToBytes32(st.GenesisValidatorsRoot),
+		slot:                              st.Slot,
+		fork:                              st.Fork,
+		latestBlockHeader:                 st.LatestBlockHeader,
+		blockRoots:                        &bRoots,
+		stateRoots:                        &sRoots,
+		historicalRoots:                   hRoots,
+		eth1Data:                          st.Eth1Data,
+		eth1DataVotes:                     st.Eth1DataVotes,
+		eth1DepositIndex:                  st.Eth1DepositIndex,
+		validators:                        st.Validators,
+		balances:                          st.Balances,
+		randaoMixes:                       &mixes,
+		slashings:                         st.Slashings,
+		previousEpochParticipation:        st.PreviousEpochParticipation,
+		currentEpochParticipation:         st.CurrentEpochParticipation,
+		justificationBits:                 st.JustificationBits,
+		previousJustifiedCheckpoint:       st.PreviousJustifiedCheckpoint,
+		currentJustifiedCheckpoint:        st.CurrentJustifiedCheckpoint,
+		finalizedCheckpoint:               st.FinalizedCheckpoint,
+		inactivityScores:                  st.InactivityScores,
+		currentSyncCommittee:              st.CurrentSyncCommittee,
+		nextSyncCommittee:                 st.NextSyncCommittee,
+		latestExecutionPayloadHeaderDeneb: st.LatestExecutionPayloadHeader,
+		nextWithdrawalIndex:               st.NextWithdrawalIndex,
+		nextWithdrawalValidatorIndex:      st.NextWithdrawalValidatorIndex,
+		historicalSummaries:               st.HistoricalSummaries,
+
+		dirtyFields:           make(map[types.FieldIndex]bool, fieldCount),
+		dirtyIndices:          make(map[types.FieldIndex][]uint64, fieldCount),
+		stateFieldLeaves:      make(map[types.FieldIndex]*fieldtrie.FieldTrie, fieldCount),
+		sharedFieldReferences: make(map[types.FieldIndex]*stateutil.Reference, capellaSharedFieldRefCount),
+		rebuildTrie:           make(map[types.FieldIndex]bool, fieldCount),
+		valMapHandler:         stateutil.NewValMapHandler(st.Validators),
+	}
+
+	for _, f := range denebFields {
+		b.dirtyFields[f] = true
+		b.rebuildTrie[f] = true
+		b.dirtyIndices[f] = []uint64{}
+		trie, err := fieldtrie.NewFieldTrie(f, types.BasicArray, nil, 0)
+		if err != nil {
+			return nil, err
+		}
+		b.stateFieldLeaves[f] = trie
+	}
+
+	// Initialize field reference tracking for shared data.
+	b.sharedFieldReferences[types.BlockRoots] = stateutil.NewRef(1)
+	b.sharedFieldReferences[types.StateRoots] = stateutil.NewRef(1)
+	b.sharedFieldReferences[types.HistoricalRoots] = stateutil.NewRef(1)
+	b.sharedFieldReferences[types.Eth1DataVotes] = stateutil.NewRef(1)
+	b.sharedFieldReferences[types.Validators] = stateutil.NewRef(1)
+	b.sharedFieldReferences[types.Balances] = stateutil.NewRef(1)
+	b.sharedFieldReferences[types.RandaoMixes] = stateutil.NewRef(1)
+	b.sharedFieldReferences[types.Slashings] = stateutil.NewRef(1)
+	b.sharedFieldReferences[types.PreviousEpochParticipationBits] = stateutil.NewRef(1)
+	b.sharedFieldReferences[types.CurrentEpochParticipationBits] = stateutil.NewRef(1)
+	b.sharedFieldReferences[types.InactivityScores] = stateutil.NewRef(1)
+	b.sharedFieldReferences[types.LatestExecutionPayloadHeaderDeneb] = stateutil.NewRef(1) // New in Deneb.
+	b.sharedFieldReferences[types.HistoricalSummaries] = stateutil.NewRef(1)               // New in Capella.
+
+	state.StateCount.Inc()
+	// Finalizer runs when dst is being destroyed in garbage collection.
+	runtime.SetFinalizer(b, finalizerCleanup)
+	return b, nil
+}
+
 // Copy returns a deep copy of the beacon state.
 func (b *BeaconState) Copy() state.BeaconState {
 	b.lock.RLock()
@@ -490,6 +600,8 @@ func (b *BeaconState) Copy() state.BeaconState {
 		fieldCount = params.BeaconConfig().BeaconStateBellatrixFieldCount
 	case version.Capella:
 		fieldCount = params.BeaconConfig().BeaconStateCapellaFieldCount
+	case version.Deneb:
+		fieldCount = params.BeaconConfig().BeaconStateCapellaFieldCount
 	}
 
 	dst := &BeaconState{
@@ -533,6 +645,7 @@ func (b *BeaconState) Copy() state.BeaconState {
 		nextSyncCommittee:                   b.nextSyncCommitteeVal(),
 		latestExecutionPayloadHeader:        b.latestExecutionPayloadHeaderVal(),
 		latestExecutionPayloadHeaderCapella: b.latestExecutionPayloadHeaderCapellaVal(),
+		latestExecutionPayloadHeaderDeneb:   b.latestExecutionPayloadHeaderDenebVal(),
 
 		dirtyFields:      make(map[types.FieldIndex]bool, fieldCount),
 		dirtyIndices:     make(map[types.FieldIndex][]uint64, fieldCount),
@@ -552,6 +665,8 @@ func (b *BeaconState) Copy() state.BeaconState {
 		dst.sharedFieldReferences = make(map[types.FieldIndex]*stateutil.Reference, bellatrixSharedFieldRefCount)
 	case version.Capella:
 		dst.sharedFieldReferences = make(map[types.FieldIndex]*stateutil.Reference, capellaSharedFieldRefCount)
+	case version.Deneb:
+		dst.sharedFieldReferences = make(map[types.FieldIndex]*stateutil.Reference, denebSharedFieldRefCount)
 	}
 
 	for field, ref := range b.sharedFieldReferences {
@@ -641,6 +756,8 @@ func (b *BeaconState) initializeMerkleLayers(ctx context.Context) error {
 		b.dirtyFields = make(map[types.FieldIndex]bool, params.BeaconConfig().BeaconStateBellatrixFieldCount)
 	case version.Capella:
 		b.dirtyFields = make(map[types.FieldIndex]bool, params.BeaconConfig().BeaconStateCapellaFieldCount)
+	case version.Deneb:
+		b.dirtyFields = make(map[types.FieldIndex]bool, params.BeaconConfig().BeaconStateCapellaFieldCount)
 	}
 
 	return nil
@@ -832,6 +949,8 @@ func (b *BeaconState) rootSelector(ctx context.Context, field types.FieldIndex)
 		return b.latestExecutionPayloadHeader.HashTreeRoot()
 	case types.LatestExecutionPayloadHeaderCapella:
 		return b.latestExecutionPayloadHeaderCapella.HashTreeRoot()
+	case types.LatestExecutionPayloadHeaderDeneb:
+		return b.latestExecutionPayloadHeaderDeneb.HashTreeRoot()
 	case types.NextWithdrawalIndex:
 		return ssz.Uint64Root(b.nextWithdrawalIndex), nil
 	case types.NextWithdrawalValidatorIndex:

beacon-chain/state/state-native/types/types.go

@@ -146,7 +146,7 @@ func (f FieldIndex) RealPosition() int {
 		return 22
 	case NextSyncCommittee:
 		return 23
-	case LatestExecutionPayloadHeader, LatestExecutionPayloadHeaderCapella:
+	case LatestExecutionPayloadHeader, LatestExecutionPayloadHeaderCapella, LatestExecutionPayloadHeaderDeneb:
 		return 24
 	case NextWithdrawalIndex:
 		return 25
@@ -205,6 +205,7 @@ const (
 	NextSyncCommittee
 	LatestExecutionPayloadHeader
 	LatestExecutionPayloadHeaderCapella
+	LatestExecutionPayloadHeaderDeneb
 	NextWithdrawalIndex
 	NextWithdrawalValidatorIndex
 	HistoricalSummaries

beacon-chain/state/stategen/replay.go

@@ -205,7 +205,7 @@ func ReplayProcessSlots(ctx context.Context, state state.BeaconState, slot primi
 					tracing.AnnotateError(span, err)
 					return nil, errors.Wrap(err, "could not process epoch with optimizations")
 				}
-			case version.Altair, version.Bellatrix, version.Capella:
+			case version.Altair, version.Bellatrix, version.Capella, version.Deneb:
 				state, err = altair.ProcessEpoch(ctx, state)
 				if err != nil {
 					tracing.AnnotateError(span, err)
@@ -243,6 +243,14 @@ func ReplayProcessSlots(ctx context.Context, state state.BeaconState, slot primi
 				return nil, err
 			}
 		}
+
+		if prysmtime.CanUpgradeToDeneb(state.Slot()) {
+			state, err = capella.UpgradeToDeneb(state)
+			if err != nil {
+				tracing.AnnotateError(span, err)
+				return nil, err
+			}
+		}
 	}
 
 	return state, nil

beacon-chain/sync/BUILD.bazel

@@ -4,8 +4,10 @@ go_library(
     name = "go_default_library",
     srcs = [
         "batch_verifier.go",
+        "block_and_blob_queue.go",
         "broadcast_bls_changes.go",
         "context.go",
+        "database.go",
         "deadlines.go",
         "decode_pubsub.go",
         "doc.go",
@@ -21,6 +23,7 @@ go_library(
         "rpc.go",
         "rpc_beacon_blocks_by_range.go",
         "rpc_beacon_blocks_by_root.go",
+        "rpc_blob_sidecars_by_root.go",
         "rpc_chunked_response.go",
         "rpc_goodbye.go",
         "rpc_metadata.go",
@@ -32,6 +35,7 @@ go_library(
         "subscriber_beacon_aggregate_proof.go",
         "subscriber_beacon_attestation.go",
         "subscriber_beacon_blocks.go",
+        "subscriber_blob_sidecar.go",
         "subscriber_bls_to_execution_change.go",
         "subscriber_handlers.go",
         "subscriber_sync_committee_message.go",
@@ -42,6 +46,7 @@ go_library(
         "validate_attester_slashing.go",
         "validate_beacon_attestation.go",
         "validate_beacon_blocks.go",
+        "validate_blob.go",
         "validate_bls_to_execution_change.go",
         "validate_proposer_slashing.go",
         "validate_sync_committee_message.go",
@@ -69,7 +74,6 @@ go_library(
         "//beacon-chain/core/helpers:go_default_library",
         "//beacon-chain/core/signing:go_default_library",
         "//beacon-chain/core/transition:go_default_library",
-        "//beacon-chain/core/transition/interop:go_default_library",
         "//beacon-chain/db:go_default_library",
         "//beacon-chain/db/filters:go_default_library",
         "//beacon-chain/execution:go_default_library",
@@ -109,6 +113,7 @@ go_library(
         "//time:go_default_library",
         "//time/slots:go_default_library",
         "@com_github_ethereum_go_ethereum//common/hexutil:go_default_library",
+        "@com_github_ethereum_go_ethereum//params:go_default_library",
         "@com_github_hashicorp_golang_lru//:go_default_library",
         "@com_github_libp2p_go_libp2p//core:go_default_library",
         "@com_github_libp2p_go_libp2p//core/host:go_default_library",
@@ -134,8 +139,10 @@ go_test(
     size = "small",
     srcs = [
         "batch_verifier_test.go",
+        "block_and_blob_queue_test.go",
         "broadcast_bls_changes_test.go",
         "context_test.go",
+        "database_test.go",
         "decode_pubsub_test.go",
         "error_test.go",
         "fork_watcher_test.go",
@@ -144,6 +151,7 @@ go_test(
         "rate_limiter_test.go",
         "rpc_beacon_blocks_by_range_test.go",
         "rpc_beacon_blocks_by_root_test.go",
+        "rpc_blob_sidecars_by_root_test.go",
         "rpc_chunked_response_test.go",
         "rpc_goodbye_test.go",
         "rpc_metadata_test.go",
@@ -238,6 +246,7 @@ go_test(
         "@com_github_libp2p_go_libp2p_pubsub//pb:go_default_library",
         "@com_github_patrickmn_go_cache//:go_default_library",
         "@com_github_pkg_errors//:go_default_library",
+        "@com_github_prysmaticlabs_fastssz//:go_default_library",
         "@com_github_prysmaticlabs_go_bitfield//:go_default_library",
         "@com_github_sirupsen_logrus//:go_default_library",
         "@com_github_sirupsen_logrus//hooks/test:go_default_library",

beacon-chain/sync/block_and_blob_queue.go

@@ -0,0 +1,136 @@
+package sync
+
+import (
+	"sync"
+
+	"github.com/ethereum/go-ethereum/params"
+	"github.com/pkg/errors"
+	"github.com/prysmaticlabs/prysm/v4/consensus-types/interfaces"
+	"github.com/prysmaticlabs/prysm/v4/encoding/bytesutil"
+	eth "github.com/prysmaticlabs/prysm/v4/proto/prysm/v1alpha1"
+	"github.com/prysmaticlabs/prysm/v4/runtime/version"
+)
+
+type blockAndBlobs struct {
+	blk   interfaces.ReadOnlySignedBeaconBlock
+	blobs []*eth.BlobSidecar
+}
+
+type blockAndBlocksQueue struct {
+	lock  sync.RWMutex
+	queue map[[32]byte]blockAndBlobs
+}
+
+func newBlockAndBlobs() *blockAndBlocksQueue {
+	return &blockAndBlocksQueue{
+		queue: make(map[[32]byte]blockAndBlobs),
+	}
+}
+
+func (q *blockAndBlocksQueue) addBlock(b interfaces.ReadOnlySignedBeaconBlock) error {
+	q.lock.Lock()
+	defer q.lock.Unlock()
+
+	if b.Version() < version.Deneb {
+		return errors.New("block version is not supported")
+	}
+
+	r, err := b.Block().HashTreeRoot()
+	if err != nil {
+		return err
+	}
+	bnb, ok := q.queue[r]
+	if !ok {
+		q.queue[r] = blockAndBlobs{
+			blk:   b,
+			blobs: make([]*eth.BlobSidecar, 0, 4),
+		}
+		return nil
+	}
+	bnb.blk = b
+	q.queue[r] = bnb
+
+	return nil
+}
+
+func (q *blockAndBlocksQueue) addBlob(b *eth.BlobSidecar) error {
+	q.lock.Lock()
+	defer q.lock.Unlock()
+	r := bytesutil.ToBytes32(b.BlockRoot)
+
+	bnb, ok := q.queue[r]
+	if !ok {
+		q.queue[r] = blockAndBlobs{
+			blobs: make([]*eth.BlobSidecar, 0, 4),
+		}
+		bnb = q.queue[r]
+	}
+	bnb.blobs = append(bnb.blobs, b)
+	q.queue[r] = bnb
+
+	return nil
+}
+
+func (q *blockAndBlocksQueue) getBlock(r [32]byte) (interfaces.ReadOnlySignedBeaconBlock, error) {
+	q.lock.RLock()
+	defer q.lock.RUnlock()
+
+	bnb, ok := q.queue[r]
+	if !ok {
+		return nil, errors.New("block does not exist")
+	}
+	if bnb.blk == nil {
+		return nil, errors.New("block does not exist")
+	}
+	return bnb.blk, nil
+}
+
+func (q *blockAndBlocksQueue) getBlob(r [32]byte, i uint64) (*eth.BlobSidecar, error) {
+	q.lock.RLock()
+	defer q.lock.RUnlock()
+
+	if i >= params.MaxBlobsPerBlock {
+		return nil, errors.New("request out of bounds")
+	}
+
+	bnb, ok := q.queue[r]
+	if !ok {
+		return nil, errors.New("blob does not exist")
+	}
+	for _, blob := range bnb.blobs {
+		if i == blob.Index {
+			return blob, nil
+		}
+	}
+	return nil, errors.New("blob does not exist")
+}
+
+func (q *blockAndBlocksQueue) delete(r [32]byte) {
+	q.lock.Lock()
+	defer q.lock.Unlock()
+
+	delete(q.queue, r)
+}
+
+func (q *blockAndBlocksQueue) canImport(r [32]byte) (bool, error) {
+	q.lock.RLock()
+	defer q.lock.RUnlock()
+
+	bnb, ok := q.queue[r]
+	if !ok {
+		return false, nil
+	}
+
+	if bnb.blk == nil || bnb.blk.IsNil() {
+		return false, nil
+	}
+
+	commitments, err := bnb.blk.Block().Body().BlobKzgCommitments()
+	if err != nil {
+		return false, err
+	}
+
+	// TODO: enhance check to ensure that block commitments match blob
+
+	return len(commitments) == len(bnb.blobs), nil
+}

beacon-chain/sync/block_and_blob_queue_test.go

@@ -0,0 +1,108 @@
+package sync
+
+import (
+	"testing"
+
+	"github.com/prysmaticlabs/prysm/v4/consensus-types/blocks"
+	"github.com/prysmaticlabs/prysm/v4/encoding/bytesutil"
+	eth "github.com/prysmaticlabs/prysm/v4/proto/prysm/v1alpha1"
+	"github.com/prysmaticlabs/prysm/v4/testing/require"
+	"github.com/prysmaticlabs/prysm/v4/testing/util"
+)
+
+func Test_blockAndBlocksQueue(t *testing.T) {
+	t.Run("no block", func(t *testing.T) {
+		q := newBlockAndBlobs()
+		_, err := q.getBlock([32]byte{})
+		require.ErrorContains(t, "block does not exist", err)
+		canImport, err := q.canImport([32]byte{})
+		require.NoError(t, err)
+		require.Equal(t, false, canImport)
+	})
+	t.Run("no blob", func(t *testing.T) {
+		q := newBlockAndBlobs()
+		_, err := q.getBlob([32]byte{}, 0)
+		require.ErrorContains(t, "blob does not exist", err)
+		canImport, err := q.canImport([32]byte{})
+		require.NoError(t, err)
+		require.Equal(t, false, canImport)
+	})
+	t.Run("has block, no blob", func(t *testing.T) {
+		q := newBlockAndBlobs()
+		sb, err := blocks.NewSignedBeaconBlock(util.HydrateSignedBeaconBlockDeneb(&eth.SignedBeaconBlockDeneb{}))
+		require.NoError(t, err)
+		require.NoError(t, q.addBlock(sb))
+		_, err = q.getBlob([32]byte{}, 0)
+		require.ErrorContains(t, "blob does not exist", err)
+		canImport, err := q.canImport([32]byte{})
+		require.NoError(t, err)
+		require.Equal(t, false, canImport)
+	})
+	t.Run("has one blob, no block", func(t *testing.T) {
+		q := newBlockAndBlobs()
+		require.NoError(t, q.addBlob(&eth.BlobSidecar{Index: 1}))
+		_, err := q.getBlock([32]byte{})
+		require.ErrorContains(t, "block does not exist", err)
+		_, err = q.getBlob([32]byte{}, 0)
+		require.ErrorContains(t, "blob does not exist", err)
+		_, err = q.getBlob([32]byte{}, 2)
+		require.ErrorContains(t, "blob does not exist", err)
+		_, err = q.getBlob([32]byte{}, 3)
+		require.ErrorContains(t, "blob does not exist", err)
+		canImport, err := q.canImport([32]byte{})
+		require.NoError(t, err)
+		require.Equal(t, false, canImport)
+	})
+	t.Run("has everything", func(t *testing.T) {
+		q := newBlockAndBlobs()
+		sb, err := blocks.NewSignedBeaconBlock(util.HydrateSignedBeaconBlockDeneb(&eth.SignedBeaconBlockDeneb{Block: &eth.BeaconBlockDeneb{}}))
+		require.NoError(t, err)
+		b := bytesutil.PadTo([]byte("kzg"), 48)
+		require.NoError(t, sb.SetBlobKzgCommitments([][]byte{b, b, b}))
+		r, err := sb.Block().HashTreeRoot()
+		require.NoError(t, err)
+		require.NoError(t, q.addBlock(sb))
+		require.NoError(t, q.addBlob(&eth.BlobSidecar{BlockRoot: r[:], Index: 0}))
+		require.NoError(t, q.addBlob(&eth.BlobSidecar{BlockRoot: r[:], Index: 1}))
+		require.NoError(t, q.addBlob(&eth.BlobSidecar{BlockRoot: r[:], Index: 2}))
+		blk, err := q.getBlock(r)
+		require.NoError(t, err)
+		require.DeepEqual(t, sb, blk)
+		blob, err := q.getBlob(r, 0)
+		require.NoError(t, err)
+		require.Equal(t, uint64(0), blob.Index)
+		blob, err = q.getBlob(r, 1)
+		require.NoError(t, err)
+		require.Equal(t, uint64(1), blob.Index)
+		blob, err = q.getBlob(r, 2)
+		require.NoError(t, err)
+		require.Equal(t, uint64(2), blob.Index)
+		canImport, err := q.canImport(r)
+		require.NoError(t, err)
+		require.Equal(t, true, canImport)
+	})
+	t.Run("only has higher index", func(t *testing.T) {
+		q := newBlockAndBlobs()
+		sb, err := blocks.NewSignedBeaconBlock(util.HydrateSignedBeaconBlockDeneb(&eth.SignedBeaconBlockDeneb{Block: &eth.BeaconBlockDeneb{}}))
+		require.NoError(t, err)
+		b := bytesutil.PadTo([]byte("kzg"), 48)
+		require.NoError(t, sb.SetBlobKzgCommitments([][]byte{b, b, b}))
+		r, err := sb.Block().HashTreeRoot()
+		require.NoError(t, err)
+		require.NoError(t, q.addBlock(sb))
+		require.NoError(t, q.addBlob(&eth.BlobSidecar{BlockRoot: r[:], Index: 2}))
+		blk, err := q.getBlock(r)
+		require.NoError(t, err)
+		require.DeepEqual(t, sb, blk)
+		_, err = q.getBlob(r, 0)
+		require.ErrorContains(t, "blob does not exist", err)
+		_, err = q.getBlob(r, 1)
+		require.ErrorContains(t, "blob does not exist", err)
+		blob, err := q.getBlob(r, 2)
+		require.NoError(t, err)
+		require.Equal(t, uint64(2), blob.Index)
+		canImport, err := q.canImport(r)
+		require.NoError(t, err)
+		require.Equal(t, false, canImport)
+	})
+}

beacon-chain/sync/context.go

@@ -52,25 +52,33 @@ func readContextFromStream(stream network.Stream, chain blockchain.ForkFetcher)
 
 // retrieve expected context depending on rpc topic schema version.
 func rpcContext(stream network.Stream, chain blockchain.ForkFetcher) ([]byte, error) {
-	_, _, version, err := p2p.TopicDeconstructor(string(stream.Protocol()))
+	_, message, version, err := p2p.TopicDeconstructor(string(stream.Protocol()))
 	if err != nil {
 		return nil, err
 	}
+
+	var provideCtx bool
 	switch version {
 	case p2p.SchemaVersionV1:
-		// Return empty context for a v1 method.
-		return []byte{}, nil
+		// and if it doesn't exist then we assume it's a new topic introduced after altair
+		provideCtx = !p2p.PreAltairV1SchemaMapping[message]
 	case p2p.SchemaVersionV2:
-		currFork := chain.CurrentFork()
-		genRoot := chain.GenesisValidatorsRoot()
-		digest, err := signing.ComputeForkDigest(currFork.CurrentVersion, genRoot[:])
-		if err != nil {
-			return nil, err
-		}
-		return digest[:], nil
+		provideCtx = true
 	default:
 		return nil, errors.New("invalid version of %s registered for topic: %s")
 	}
+
+	if !provideCtx {
+		return []byte{}, nil
+	}
+	currFork := chain.CurrentFork()
+	genRoot := chain.GenesisValidatorsRoot()
+	digest, err := signing.ComputeForkDigest(currFork.CurrentVersion, genRoot[:])
+	if err != nil {
+		return nil, err
+	}
+	return digest[:], nil
+
 }
 
 // Minimal interface for a stream with a protocol.

beacon-chain/sync/database.go

@@ -0,0 +1,16 @@
+package sync
+
+import eth "github.com/prysmaticlabs/prysm/v4/proto/prysm/v1alpha1"
+
+type BlobSidecarGetter interface {
+	BlobSidecar(blockRoot [32]byte, index uint64) (*eth.BlobSidecar, error)
+}
+
+type BlobSidecarWriter interface {
+	WriteBlobSidecar(blockRoot [32]byte, index uint64, sidecar *eth.BlobSidecar) error
+}
+
+type BlobDB interface {
+	BlobSidecarGetter
+	BlobSidecarWriter
+}

beacon-chain/sync/database_test.go

@@ -0,0 +1,34 @@
+package sync
+
+import (
+	"github.com/pkg/errors"
+	"github.com/prysmaticlabs/prysm/v4/beacon-chain/db"
+	ethpb "github.com/prysmaticlabs/prysm/v4/proto/prysm/v1alpha1"
+)
+
+type mockSidecarId struct {
+	r [32]byte
+	i uint64
+}
+
+type MockBlobDB struct {
+	storage map[mockSidecarId]*ethpb.BlobSidecar
+}
+
+func (m *MockBlobDB) BlobSidecar(r [32]byte, idx uint64) (*ethpb.BlobSidecar, error) {
+	sc, ok := m.storage[mockSidecarId{r, idx}]
+	if !ok {
+		return nil, errors.Wrapf(db.ErrNotFound, "MockBlobsDB.storage does not contain blob: root=%#x, idx=%d", r, idx)
+	}
+	return sc, nil
+}
+
+func (m *MockBlobDB) WriteBlobSidecar(r [32]byte, idx uint64, s *ethpb.BlobSidecar) error {
+	if m.storage == nil {
+		m.storage = make(map[mockSidecarId]*ethpb.BlobSidecar)
+	}
+	m.storage[mockSidecarId{r, idx}] = s
+	return nil
+}
+
+var _ BlobDB = &MockBlobDB{}

beacon-chain/sync/decode_pubsub.go

@@ -37,6 +37,8 @@ func (s *Service) decodePubsubMessage(msg *pubsub.Message) (ssz.Unmarshaler, err
 		// differentiate them below.
 	case strings.Contains(topic, p2p.GossipSyncCommitteeMessage) && !strings.Contains(topic, p2p.SyncContributionAndProofSubnetTopicFormat):
 		topic = p2p.GossipTypeMapping[reflect.TypeOf(&ethpb.SyncCommitteeMessage{})]
+	case strings.Contains(topic, p2p.GossipBlobSidecarMessage):
+		topic = p2p.GossipTypeMapping[reflect.TypeOf(&ethpb.SignedBlobSidecar{})]
 	}
 
 	base := p2p.GossipTopicMappings(topic, 0)

beacon-chain/sync/error.go

@@ -16,6 +16,7 @@ import (
 var responseCodeSuccess = byte(0x00)
 var responseCodeInvalidRequest = byte(0x01)
 var responseCodeServerError = byte(0x02)
+var responseCodeResourceUnavailable = byte(0x03)
 
 func (s *Service) generateErrorResponse(code byte, reason string) ([]byte, error) {
 	return createErrorResponse(code, reason, s.cfg.p2p)

beacon-chain/sync/fork_watcher.go

@@ -63,6 +63,9 @@ func (s *Service) registerForUpcomingFork(currEpoch primitives.Epoch) error {
 		if nextEpoch == params.BeaconConfig().AltairForkEpoch {
 			s.registerRPCHandlersAltair()
 		}
+		if nextEpoch == params.BeaconConfig().DenebForkEpoch {
+			s.registerRPCHandlersDeneb()
+		}
 	}
 	return nil
 }

beacon-chain/sync/initial-sync/round_robin.go

@@ -81,6 +81,9 @@ func (s *Service) syncToFinalizedEpoch(ctx context.Context, genesis time.Time) e
 	}
 
 	for data := range queue.fetchedData {
+		// If blobs are available. Verify blobs and blocks are consistence.
+		// We can't import a block if there's no associated blob within DA bound.
+		// The blob has to pass aggregated proof check.
 		s.processFetchedData(ctx, genesis, s.cfg.Chain.HeadSlot(), data)
 	}
 

beacon-chain/sync/initial-sync/service.go

@@ -35,7 +35,7 @@ type blockchainService interface {
 // Config to set up the initial sync service.
 type Config struct {
 	P2P           p2p.P2P
-	DB            db.ReadOnlyDatabase
+	DB            db.NoHeadAccessDatabase
 	Chain         blockchainService
 	StateNotifier statefeed.Notifier
 	BlockNotifier blockfeed.Notifier

beacon-chain/sync/options.go

@@ -18,6 +18,13 @@ import (
 
 type Option func(s *Service) error
 
+func WithBlobDB(bdb BlobDB) Option {
+	return func(s *Service) error {
+		s.blobs = bdb
+		return nil
+	}
+}
+
 func WithAttestationNotifier(notifier operation.Notifier) Option {
 	return func(s *Service) error {
 		s.cfg.attestationNotifier = notifier

beacon-chain/sync/pending_blocks_queue.go

@@ -9,7 +9,6 @@ import (
 
 	"github.com/pkg/errors"
 	"github.com/prysmaticlabs/prysm/v4/async"
-	"github.com/prysmaticlabs/prysm/v4/beacon-chain/blockchain"
 	p2ptypes "github.com/prysmaticlabs/prysm/v4/beacon-chain/p2p/types"
 	"github.com/prysmaticlabs/prysm/v4/config/params"
 	"github.com/prysmaticlabs/prysm/v4/consensus-types/blocks"
@@ -19,6 +18,7 @@ import (
 	"github.com/prysmaticlabs/prysm/v4/encoding/bytesutil"
 	"github.com/prysmaticlabs/prysm/v4/encoding/ssz/equality"
 	"github.com/prysmaticlabs/prysm/v4/monitoring/tracing"
+	"github.com/prysmaticlabs/prysm/v4/runtime/version"
 	"github.com/prysmaticlabs/prysm/v4/time/slots"
 	"github.com/sirupsen/logrus"
 	"github.com/trailofbits/go-mutexasserts"
@@ -159,21 +159,20 @@ func (s *Service) processPendingBlocks(ctx context.Context) error {
 			default:
 			}
 
-			if err := s.cfg.chain.ReceiveBlock(ctx, b, blkRoot); err != nil {
-				if blockchain.IsInvalidBlock(err) {
-					r := blockchain.InvalidBlockRoot(err)
-					if r != [32]byte{} {
-						s.setBadBlock(ctx, r) // Setting head block as bad.
-					} else {
-						s.setBadBlock(ctx, blkRoot)
-					}
+			if b.Version() >= version.Deneb {
+				if err = s.blockAndBlobs.addBlock(b); err != nil {
+					log.WithError(err).Error("Could not add block to block and blobs pool")
+					continue
+				}
+				if err = s.importBlockAndBlobs(ctx, blkRoot); err != nil {
+					log.WithError(err).Error("Could not import block and blobs")
+					continue
+				}
+			} else {
+				if err = s.receiveBlock(ctx, b, blkRoot); err != nil {
+					log.WithError(err).WithField("slot", b.Block().Slot()).Debug("Could not process block")
+					continue
 				}
-				log.WithError(err).WithField("slot", b.Block().Slot()).Debug("Could not process block")
-
-				// In the next iteration of the queue, this block will be removed from
-				// the pending queue as it has been marked as a 'bad' block.
-				span.End()
-				continue
 			}
 
 			s.setSeenBlockIndexSlot(b.Block().Slot(), b.Block().ProposerIndex())
@@ -182,10 +181,9 @@ func (s *Service) processPendingBlocks(ctx context.Context) error {
 			pb, err := b.Proto()
 			if err != nil {
 				log.WithError(err).Debug("Could not get protobuf block")
-			} else {
-				if err := s.cfg.p2p.Broadcast(ctx, pb); err != nil {
-					log.WithError(err).Debug("Could not broadcast block")
-				}
+			}
+			if err := s.cfg.p2p.Broadcast(ctx, pb); err != nil {
+				log.WithError(err).Debug("Could not broadcast block")
 			}
 
 			s.pendingQueueLock.Lock()
@@ -257,10 +255,11 @@ func (s *Service) sendBatchRootRequest(ctx context.Context, roots [][32]byte, ra
 		if len(roots) > int(params.BeaconNetworkConfig().MaxRequestBlocks) {
 			req = roots[:params.BeaconNetworkConfig().MaxRequestBlocks]
 		}
-		if err := s.sendRecentBeaconBlocksRequest(ctx, &req, pid); err != nil {
+		if err := s.sendRecentBeaconBlocksAndBlobsRequest(ctx, &req, pid); err != nil {
 			tracing.AnnotateError(span, err)
 			log.WithError(err).Debug("Could not send recent block request")
 		}
+
 		newRoots := make([][32]byte, 0, len(roots))
 		s.pendingQueueLock.RLock()
 		for _, rt := range roots {
@@ -286,15 +285,16 @@ func (s *Service) sortedPendingSlots() []primitives.Slot {
 
 	items := s.slotToPendingBlocks.Items()
 
-	ss := make([]primitives.Slot, 0, len(items))
+	ss1 := make([]primitives.Slot, 0, len(items))
 	for k := range items {
 		slot := cacheKeyToSlot(k)
-		ss = append(ss, slot)
+		ss1 = append(ss1, slot)
 	}
-	sort.Slice(ss, func(i, j int) bool {
-		return ss[i] < ss[j]
+	sort.Slice(ss1, func(i, j int) bool {
+		return ss1[i] < ss1[j]
 	})
-	return ss
+
+	return ss1
 }
 
 // validatePendingSlots validates the pending blocks
@@ -311,9 +311,11 @@ func (s *Service) validatePendingSlots() error {
 		return errors.New("slotToPendingBlocks cache can't be nil")
 	}
 	items := s.slotToPendingBlocks.Items()
+
 	for k := range items {
 		slot := cacheKeyToSlot(k)
 		blks := s.pendingBlocksInCache(slot)
+
 		for _, b := range blks {
 			epoch := slots.ToEpoch(slot)
 			// remove all descendant blocks of old blocks
@@ -392,7 +394,9 @@ func (s *Service) deleteBlockFromPendingQueue(slot primitives.Slot, b interfaces
 	if err := s.slotToPendingBlocks.Replace(slotToCacheKey(slot), newBlks, d); err != nil {
 		return err
 	}
+
 	delete(s.seenPendingBlocks, r)
+
 	return nil
 }
 

beacon-chain/sync/pending_blocks_queue_test.go

@@ -830,6 +830,7 @@ func TestService_ProcessBadPendingBlocks(t *testing.T) {
 	bA, err := blocks.NewSignedBeaconBlock(b)
 	assert.NoError(t, err)
 
+	// TODO: using the old deprecated type here because that's what the code expects, will get fixed with new sync queue
 	// Add block1 for slot 55
 	require.NoError(t, r.insertBlockToPendingQueue(b.Block.Slot, bA, b1Root))
 	bB, err := blocks.NewSignedBeaconBlock(util.NewBeaconBlock())

beacon-chain/sync/rate_limiter.go

@@ -20,7 +20,7 @@ const defaultBurstLimit = 5
 const leakyBucketPeriod = 1 * time.Second
 
 // Only allow in 2 batches per minute.
-const blockBucketPeriod = 30 * time.Second
+const blockBucketPeriod = 5 * time.Second
 
 // Dummy topic to validate all incoming rpc requests.
 const rpcLimiterTopic = "rpc-limiter-topic"
@@ -59,9 +59,12 @@ func newRateLimiter(p2pProvider p2p.P2P) *limiter {
 	// Collector for V2
 	blockCollectorV2 := leakybucket.NewCollector(allowedBlocksPerSecond, allowedBlocksBurst, blockBucketPeriod, false /* deleteEmptyBuckets */)
 
+	blobCollector := leakybucket.NewCollector(allowedBlocksPerSecond, allowedBlocksBurst, blockBucketPeriod, false /* deleteEmptyBuckets */)
+
 	// BlocksByRoots requests
 	topicMap[addEncoding(p2p.RPCBlocksByRootTopicV1)] = blockCollector
 	topicMap[addEncoding(p2p.RPCBlocksByRootTopicV2)] = blockCollectorV2
+	topicMap[addEncoding(p2p.RPCBlobSidecarsByRootTopicV1)] = blobCollector
 
 	// BlockByRange requests
 	topicMap[addEncoding(p2p.RPCBlocksByRangeTopicV1)] = blockCollector

beacon-chain/sync/rate_limiter_test.go

@@ -18,7 +18,7 @@ import (
 
 func TestNewRateLimiter(t *testing.T) {
 	rlimiter := newRateLimiter(mockp2p.NewTestP2P(t))
-	assert.Equal(t, len(rlimiter.limiterMap), 10, "correct number of topics not registered")
+	assert.Equal(t, len(rlimiter.limiterMap), 12, "correct number of topics not registered")
 }
 
 func TestNewRateLimiter_FreeCorrectly(t *testing.T) {

beacon-chain/sync/rpc.go

@@ -49,6 +49,9 @@ func (s *Service) registerRPCHandlers() {
 			s.pingHandler,
 		)
 		s.registerRPCHandlersAltair()
+		if currEpoch >= params.BeaconConfig().DenebForkEpoch {
+			s.registerRPCHandlersDeneb()
+		}
 		return
 	}
 	s.registerRPC(
@@ -83,6 +86,7 @@ func (s *Service) registerRPCHandlersAltair() {
 		p2p.RPCBlocksByRangeTopicV2,
 		s.beaconBlocksByRangeRPCHandler,
 	)
+	// TODO(Deneb): Unregister this post Deneb fork epoch.
 	s.registerRPC(
 		p2p.RPCBlocksByRootTopicV2,
 		s.beaconBlocksRootRPCHandler,
@@ -93,6 +97,13 @@ func (s *Service) registerRPCHandlersAltair() {
 	)
 }
 
+func (s *Service) registerRPCHandlersDeneb() {
+	s.registerRPC(
+		p2p.RPCBlobSidecarsByRootTopicV1,
+		s.blobSidecarByRootRPCHandler,
+	)
+}
+
 // Remove all v1 Stream handlers that are no longer supported
 // from altair onwards.
 func (s *Service) unregisterPhase0Handlers() {

beacon-chain/sync/rpc_beacon_blocks_by_root.go

@@ -11,14 +11,17 @@ import (
 	"github.com/prysmaticlabs/prysm/v4/config/params"
 	"github.com/prysmaticlabs/prysm/v4/consensus-types/blocks"
 	"github.com/prysmaticlabs/prysm/v4/consensus-types/interfaces"
+	eth "github.com/prysmaticlabs/prysm/v4/proto/prysm/v1alpha1"
+	"github.com/prysmaticlabs/prysm/v4/runtime/version"
 )
 
-// sendRecentBeaconBlocksRequest sends a recent beacon blocks request to a peer to get
+// sendRecentBeaconBlocksAndBlobsRequest sends a recent beacon blocks request to a peer to get
 // those corresponding blocks from that peer.
-func (s *Service) sendRecentBeaconBlocksRequest(ctx context.Context, blockRoots *types.BeaconBlockByRootsReq, id peer.ID) error {
+func (s *Service) sendRecentBeaconBlocksAndBlobsRequest(ctx context.Context, blockRoots *types.BeaconBlockByRootsReq, id peer.ID) error {
 	ctx, cancel := context.WithTimeout(ctx, respTimeout)
 	defer cancel()
 
+	var requestBlobs map[[32]byte]int
 	_, err := SendBeaconBlocksByRootRequest(ctx, s.cfg.chain, s.cfg.p2p, id, blockRoots, func(blk interfaces.ReadOnlySignedBeaconBlock) error {
 		blkRoot, err := blk.Block().HashTreeRoot()
 		if err != nil {
@@ -29,8 +32,44 @@ func (s *Service) sendRecentBeaconBlocksRequest(ctx context.Context, blockRoots
 		if err := s.insertBlockToPendingQueue(blk.Block().Slot(), blk, blkRoot); err != nil {
 			return err
 		}
+		if blk.Version() >= version.Deneb {
+			kzgs, err := blk.Block().Body().BlobKzgCommitments()
+			if err != nil {
+				return err
+			}
+			requestBlobs[blkRoot] = len(kzgs)
+		}
 		return nil
 	})
+	if err != nil {
+		return err
+	}
+
+	var reqs []*eth.BlobIdentifier
+	for root, count := range requestBlobs {
+		for i := 0; i < count; i++ {
+			reqs = append(reqs, &eth.BlobIdentifier{
+				BlockRoot: root[:],
+				Index:     uint64(i),
+			})
+		}
+	}
+	if len(reqs) == 0 {
+		return nil
+	}
+
+	blobs, err := SendBlobSidecarByRoot(ctx, s.cfg.chain, s.cfg.p2p, id, reqs)
+	if err != nil {
+		return err
+	}
+
+	// TODO: validate blobs
+	for _, blob := range blobs {
+		if err = s.blockAndBlobs.addBlob(blob); err != nil {
+			return err
+		}
+	}
+
 	return err
 }
 

beacon-chain/sync/rpc_beacon_blocks_by_root_test.go

@@ -244,7 +244,7 @@ func TestRecentBeaconBlocks_RPCRequestSent(t *testing.T) {
 	})
 
 	p1.Connect(p2)
-	require.NoError(t, r.sendRecentBeaconBlocksRequest(context.Background(), &expectedRoots, p2.PeerID()))
+	require.NoError(t, r.sendRecentBeaconBlocksAndBlobsRequest(context.Background(), &expectedRoots, p2.PeerID()))
 
 	if util.WaitTimeout(&wg, 1*time.Second) {
 		t.Fatal("Did not receive stream within 1 sec")

beacon-chain/sync/rpc_blob_sidecars_by_root.go

@@ -0,0 +1,80 @@
+package sync
+
+import (
+	"context"
+
+	libp2pcore "github.com/libp2p/go-libp2p/core"
+	"github.com/pkg/errors"
+	"github.com/prysmaticlabs/prysm/v4/beacon-chain/db"
+	"github.com/prysmaticlabs/prysm/v4/beacon-chain/p2p"
+	"github.com/prysmaticlabs/prysm/v4/beacon-chain/p2p/types"
+	"github.com/prysmaticlabs/prysm/v4/config/params"
+	"github.com/prysmaticlabs/prysm/v4/consensus-types/primitives"
+	"github.com/prysmaticlabs/prysm/v4/encoding/bytesutil"
+	"github.com/prysmaticlabs/prysm/v4/monitoring/tracing"
+	"github.com/prysmaticlabs/prysm/v4/time/slots"
+	"go.opencensus.io/trace"
+)
+
+func blobMinReqEpoch(finalized, current primitives.Epoch) primitives.Epoch {
+	// max(finalized_epoch, current_epoch - MIN_EPOCHS_FOR_BLOB_SIDECARS_REQUESTS, DENEB_FORK_EPOCH)
+	denebFork := params.BeaconConfig().DenebForkEpoch
+	var reqWindow primitives.Epoch
+	if current > params.BeaconNetworkConfig().MinEpochsForBlobsSidecarsRequest {
+		reqWindow = current - params.BeaconNetworkConfig().MinEpochsForBlobsSidecarsRequest
+	}
+	if finalized >= reqWindow && finalized > denebFork {
+		return finalized
+	}
+	if reqWindow >= finalized && reqWindow > denebFork {
+		return reqWindow
+	}
+	return denebFork
+}
+
+// blobSidecarByRootRPCHandler handles the /eth2/beacon_chain/req/blob_sidecars_by_root/1/ RPC request.
+// spec: https://github.com/ethereum/consensus-specs/blob/a7e45db9ac2b60a33e144444969ad3ac0aae3d4c/specs/deneb/p2p-interface.md#blobsidecarsbyroot-v1
+func (s *Service) blobSidecarByRootRPCHandler(ctx context.Context, msg interface{}, stream libp2pcore.Stream) error {
+	ctx, span := trace.StartSpan(ctx, "sync.blobSidecarByRootRPCHandler")
+	defer span.End()
+	ctx, cancel := context.WithTimeout(ctx, ttfbTimeout)
+	defer cancel()
+	SetRPCStreamDeadlines(stream)
+	log := log.WithField("handler", p2p.BlobSidecarsByRootName[1:]) // slice the leading slash off the name var
+	ref, ok := msg.(*types.BlobSidecarsByRootReq)
+	if !ok {
+		return errors.New("message is not type BeaconBlockByRootsReq")
+	}
+	minReqEpoch := blobMinReqEpoch(s.cfg.chain.FinalizedCheckpt().Epoch, slots.ToEpoch(s.cfg.chain.CurrentSlot()))
+	blobIdents := *ref
+	for i := range blobIdents {
+		root, idx := bytesutil.ToBytes32(blobIdents[i].BlockRoot), blobIdents[i].Index
+		sc, err := s.blobs.BlobSidecar(root, idx)
+		if err != nil {
+			if errors.Is(err, db.ErrNotFound) {
+				continue
+			}
+			log.WithError(err).Debugf("error retrieving BlobSidecar, root=%x, idnex=%d", root, idx)
+			s.writeErrorResponseToStream(responseCodeServerError, types.ErrGeneric.Error(), stream)
+			return err
+		}
+
+		// If any root in the request content references a block earlier than minimum_request_epoch,
+		// peers MAY respond with error code 3: ResourceUnavailable or not include the blob in the response.
+		if slots.ToEpoch(sc.Slot) < minReqEpoch {
+			s.writeErrorResponseToStream(responseCodeResourceUnavailable, types.ErrBlobLTMinRequest.Error(), stream)
+			log.WithError(types.ErrBlobLTMinRequest).
+				Debugf("requested blob for block %#x before minimum_request_epoch", blobIdents[i].BlockRoot)
+			return types.ErrBlobLTMinRequest
+		}
+		SetStreamWriteDeadline(stream, defaultWriteDuration)
+		if chunkErr := WriteBlobSidecarChunk(stream, s.cfg.chain, s.cfg.p2p.Encoding(), sc); chunkErr != nil {
+			log.WithError(chunkErr).Debug("Could not send a chunked response")
+			s.writeErrorResponseToStream(responseCodeServerError, types.ErrGeneric.Error(), stream)
+			tracing.AnnotateError(span, chunkErr)
+			return chunkErr
+		}
+		s.rateLimiter.add(stream, 1)
+	}
+	return nil
+}

beacon-chain/sync/rpc_blob_sidecars_by_root_test.go

@@ -0,0 +1,441 @@
+package sync
+
+import (
+	"context"
+	"encoding/binary"
+	"io"
+	"math"
+	"math/big"
+	"testing"
+	"time"
+
+	"github.com/ethereum/go-ethereum/common"
+	gethTypes "github.com/ethereum/go-ethereum/core/types"
+	"github.com/libp2p/go-libp2p/core/network"
+	"github.com/libp2p/go-libp2p/core/protocol"
+	ssz "github.com/prysmaticlabs/fastssz"
+	mock "github.com/prysmaticlabs/prysm/v4/beacon-chain/blockchain/testing"
+	"github.com/prysmaticlabs/prysm/v4/beacon-chain/p2p"
+	"github.com/prysmaticlabs/prysm/v4/beacon-chain/p2p/encoder"
+	p2ptest "github.com/prysmaticlabs/prysm/v4/beacon-chain/p2p/testing"
+	p2pTypes "github.com/prysmaticlabs/prysm/v4/beacon-chain/p2p/types"
+	fieldparams "github.com/prysmaticlabs/prysm/v4/config/fieldparams"
+	"github.com/prysmaticlabs/prysm/v4/config/params"
+	types "github.com/prysmaticlabs/prysm/v4/consensus-types/primitives"
+	leakybucket "github.com/prysmaticlabs/prysm/v4/container/leaky-bucket"
+	"github.com/prysmaticlabs/prysm/v4/encoding/bytesutil"
+	"github.com/prysmaticlabs/prysm/v4/network/forks"
+	enginev1 "github.com/prysmaticlabs/prysm/v4/proto/engine/v1"
+	ethpb "github.com/prysmaticlabs/prysm/v4/proto/prysm/v1alpha1"
+	"github.com/prysmaticlabs/prysm/v4/testing/require"
+	"github.com/prysmaticlabs/prysm/v4/testing/util"
+	"github.com/prysmaticlabs/prysm/v4/time/slots"
+)
+
+type sidecarsTestCase struct {
+	name    string
+	nblocks int                  // how many blocks to loop through in setting up test fixtures & requests
+	missing map[int]map[int]bool // skip this blob index, so that we can test different custody scenarios
+	expired map[int]bool         // mark block expired to test scenarios where requests are outside retention window
+	chain   *mock.ChainService   // allow tests to control retention window via current slot and finalized checkpoint
+	total   *int                 // allow a test to specify the total number of responses received
+	err     error
+}
+
+func generateTestBlock(t *testing.T, slot types.Slot) *ethpb.SignedBeaconBlockDeneb {
+	// Start service with 160 as allowed blocks capacity (and almost zero capacity recovery).
+	parent := bytesutil.PadTo([]byte("parentHash"), fieldparams.RootLength)
+	stateRoot := bytesutil.PadTo([]byte("stateRoot"), fieldparams.RootLength)
+	receiptsRoot := bytesutil.PadTo([]byte("receiptsRoot"), fieldparams.RootLength)
+	logsBloom := bytesutil.PadTo([]byte("logs"), fieldparams.LogsBloomLength)
+	tx := gethTypes.NewTransaction(
+		0,
+		common.HexToAddress("095e7baea6a6c7c4c2dfeb977efac326af552d87"),
+		big.NewInt(0), 0, big.NewInt(0),
+		nil,
+	)
+	txs := []*gethTypes.Transaction{tx}
+	encodedBinaryTxs := make([][]byte, 1)
+	var err error
+	encodedBinaryTxs[0], err = txs[0].MarshalBinary()
+	require.NoError(t, err)
+	blockHash := bytesutil.ToBytes32([]byte("foo"))
+	payload := &enginev1.ExecutionPayloadDeneb{
+		ParentHash:    parent,
+		FeeRecipient:  make([]byte, fieldparams.FeeRecipientLength),
+		StateRoot:     stateRoot,
+		ReceiptsRoot:  receiptsRoot,
+		LogsBloom:     logsBloom,
+		PrevRandao:    blockHash[:],
+		BlockNumber:   0,
+		GasLimit:      0,
+		GasUsed:       0,
+		Timestamp:     0,
+		ExtraData:     make([]byte, 0),
+		BaseFeePerGas: bytesutil.PadTo([]byte("baseFeePerGas"), fieldparams.RootLength),
+		ExcessDataGas: bytesutil.PadTo([]byte("excessDataGas"), fieldparams.RootLength),
+		BlockHash:     blockHash[:],
+		Transactions:  encodedBinaryTxs,
+	}
+	block := util.NewBeaconBlockDeneb()
+	block.Block.Body.ExecutionPayload = payload
+	block.Block.Slot = slot
+	return block
+}
+
+func generateTestSidecar(root [32]byte, block *ethpb.SignedBeaconBlockDeneb, index int) *ethpb.BlobSidecar {
+	blob := &enginev1.Blob{
+		Data: make([]byte, fieldparams.BlobSize),
+	}
+	binary.LittleEndian.PutUint64(blob.Data, uint64(index))
+	return &ethpb.BlobSidecar{
+		BlockRoot:       root[:],
+		Index:           uint64(index),
+		Slot:            block.Block.Slot,
+		BlockParentRoot: block.Block.ParentRoot,
+		ProposerIndex:   block.Block.ProposerIndex,
+		Blob:            blob,
+		KzgCommitment:   make([]byte, 48),
+		KzgProof:        make([]byte, 48),
+	}
+}
+
+type expectedResponse struct {
+	skipped bool
+	code    uint8
+	sidecar *ethpb.BlobSidecar
+	message string
+}
+
+type streamDecoder func(io.Reader, ssz.Unmarshaler) error
+
+func (r *expectedResponse) requireExpected(t *testing.T, d streamDecoder, stream network.Stream) {
+	if r.skipped {
+		return
+	}
+	code, _, err := ReadStatusCode(stream, &encoder.SszNetworkEncoder{})
+	require.NoError(t, err)
+	require.Equal(t, r.code, code, "unexpected response code")
+	//require.Equal(t, r.message, msg, "unexpected error message")
+	if r.sidecar == nil {
+		return
+	}
+	sc := &ethpb.BlobSidecar{}
+	require.NoError(t, d(stream, sc))
+	require.Equal(t, bytesutil.ToBytes32(sc.BlockRoot), bytesutil.ToBytes32(r.sidecar.BlockRoot))
+	require.Equal(t, sc.Index, r.sidecar.Index)
+}
+
+func (c sidecarsTestCase) run(t *testing.T) {
+	cfg := params.BeaconConfig()
+	repositionFutureEpochs(cfg)
+	undo, err := params.SetActiveWithUndo(cfg)
+	require.NoError(t, err)
+	defer func() {
+		require.NoError(t, undo())
+	}()
+	maxBlobs := int(params.BeaconConfig().MaxBlobsPerBlock)
+	if c.chain == nil {
+		c.chain = defaultMockChain(t)
+	}
+
+	db := &MockBlobDB{}
+	var req p2pTypes.BlobSidecarsByRootReq
+	var expect []*expectedResponse
+	oldest, err := slots.EpochStart(blobMinReqEpoch(c.chain.FinalizedCheckPoint.Epoch, slots.ToEpoch(c.chain.CurrentSlot())))
+	require.NoError(t, err)
+	streamTerminated := false
+	for i := 0; i < c.nblocks; i++ {
+		// check if there is a slot override for this index
+		// ie to create a block outside the minimum_request_epoch
+		var bs types.Slot
+		if c.expired[i] {
+			// the lowest possible bound of the retention period is the deneb epoch, so make sure
+			// the slot of an expired block is at least one slot less than the deneb epoch.
+			bs = oldest - 1 - types.Slot(i)
+		} else {
+			bs = oldest + types.Slot(i)
+		}
+		block := generateTestBlock(t, bs+types.Slot(i))
+		root, err := block.HashTreeRoot()
+		require.NoError(t, err)
+		binary.LittleEndian.PutUint64(root[:], uint64(i))
+		for bi := 0; bi < maxBlobs; bi++ {
+			ubi := uint64(bi)
+			req = append(req, &ethpb.BlobIdentifier{BlockRoot: root[:], Index: ubi})
+
+			if streamTerminated {
+				// once we know there is a bad response in the sequence, we want to filter out any subsequent
+				// expected responses, because an error response terminates the stream.
+				continue
+			}
+			// skip sidecars that are supposed to be missing
+			if missed, ok := c.missing[i]; ok && missed[bi] {
+				continue
+			}
+			sc := generateTestSidecar(root, block, bi)
+			require.NoError(t, db.WriteBlobSidecar(root, ubi, sc))
+			// if a sidecar is expired, we'll expect an error for the *first* index, and after that
+			// we'll expect no further chunks in the stream, so filter out any further expected responses.
+			// we don't need to check what index this is because we work through them in order and the first one
+			// will set streamTerminated = true and skip everything else in the test case.
+			if c.expired[i] {
+				expect = append(expect, &expectedResponse{
+					code:    responseCodeResourceUnavailable,
+					message: p2pTypes.ErrBlobLTMinRequest.Error(),
+				})
+				streamTerminated = true
+				continue
+			}
+
+			expect = append(expect, &expectedResponse{
+				sidecar: sc,
+				code:    responseCodeSuccess,
+				message: "",
+			})
+		}
+	}
+	rate := params.BeaconNetworkConfig().MaxRequestBlobsSidecars * params.BeaconConfig().MaxBlobsPerBlock
+	client := p2ptest.NewTestP2P(t)
+	s := &Service{
+		cfg:         &config{p2p: client, chain: c.chain},
+		blobs:       db,
+		rateLimiter: newRateLimiter(client)}
+	s.setRateCollector(p2p.RPCBlobSidecarsByRootTopicV1, leakybucket.NewCollector(0.000001, int64(rate), time.Second, false))
+
+	dec := s.cfg.p2p.Encoding().DecodeWithMaxLength
+	if c.total != nil {
+		require.Equal(t, *c.total, len(expect))
+	}
+	nh := func(stream network.Stream) {
+		for _, ex := range expect {
+			ex.requireExpected(t, dec, stream)
+		}
+	}
+	rht := &rpcHandlerTest{t: t, client: client, topic: p2p.RPCBlocksByRootTopicV1, timeout: time.Second * 10, err: c.err}
+	rht.testHandler(nh, s.blobSidecarByRootRPCHandler, &req)
+}
+
+type rpcHandlerTest struct {
+	t       *testing.T
+	client  *p2ptest.TestP2P
+	topic   protocol.ID
+	timeout time.Duration
+	err     error
+}
+
+func (rt *rpcHandlerTest) testHandler(nh network.StreamHandler, rh rpcHandler, rhi interface{}) {
+	ctx, cancel := context.WithTimeout(context.Background(), rt.timeout)
+	defer func() {
+		cancel()
+	}()
+
+	w := util.NewWaiter()
+	server := p2ptest.NewTestP2P(rt.t)
+	rt.client.Connect(server)
+	defer func() {
+		require.NoError(rt.t, rt.client.Disconnect(server.PeerID()))
+	}()
+	require.Equal(rt.t, 1, len(rt.client.BHost.Network().Peers()), "Expected peers to be connected")
+	h := func(stream network.Stream) {
+		defer w.Done()
+		nh(stream)
+	}
+	server.BHost.SetStreamHandler(protocol.ID(rt.topic), h)
+	stream, err := rt.client.BHost.NewStream(ctx, server.BHost.ID(), protocol.ID(rt.topic))
+	require.NoError(rt.t, err)
+
+	err = rh(ctx, rhi, stream)
+	if rt.err == nil {
+		require.NoError(rt.t, err)
+	} else {
+		require.ErrorIs(rt.t, err, rt.err)
+	}
+
+	w.RequireDoneBeforeCancel(rt.t, ctx)
+}
+
+// we use max uints for future forks, but this causes overflows when computing slots
+// so it is helpful in tests to temporarily reposition the epochs to give room for some math.
+func repositionFutureEpochs(cfg *params.BeaconChainConfig) {
+	if cfg.CapellaForkEpoch == math.MaxUint64 {
+		cfg.CapellaForkEpoch = cfg.BellatrixForkEpoch + 100
+	}
+	if cfg.DenebForkEpoch == math.MaxUint64 {
+		cfg.DenebForkEpoch = cfg.CapellaForkEpoch + 100
+	}
+}
+
+func defaultMockChain(t *testing.T) *mock.ChainService {
+	df, err := forks.Fork(params.BeaconConfig().DenebForkEpoch)
+	require.NoError(t, err)
+	ce := params.BeaconConfig().DenebForkEpoch + params.BeaconNetworkConfig().MinEpochsForBlobsSidecarsRequest
+	fe := ce - 2
+	cs, err := slots.EpochStart(ce)
+	require.NoError(t, err)
+
+	return &mock.ChainService{
+		ValidatorsRoot:      [32]byte{},
+		Slot:                &cs,
+		FinalizedCheckPoint: &ethpb.Checkpoint{Epoch: fe},
+		Fork:                df}
+}
+
+func TestSidecarByRootValidation(t *testing.T) {
+	cfg := params.BeaconConfig()
+	repositionFutureEpochs(cfg)
+	undo, err := params.SetActiveWithUndo(cfg)
+	require.NoError(t, err)
+	defer func() {
+		require.NoError(t, undo())
+	}()
+	capellaSlot, err := slots.EpochStart(params.BeaconConfig().CapellaForkEpoch)
+	require.NoError(t, err)
+	dmc := defaultMockChain(t)
+	dmc.Slot = &capellaSlot
+	dmc.FinalizedCheckPoint = &ethpb.Checkpoint{Epoch: params.BeaconConfig().CapellaForkEpoch}
+	cases := []sidecarsTestCase{
+		{
+			name:    "block before minimum_request_epoch",
+			nblocks: 1,
+			expired: map[int]bool{0: true},
+			chain:   dmc,
+			err:     p2pTypes.ErrBlobLTMinRequest,
+		},
+		{
+			name:    "blocks before and after minimum_request_epoch",
+			nblocks: 2,
+			expired: map[int]bool{0: true},
+			chain:   dmc,
+			err:     p2pTypes.ErrBlobLTMinRequest,
+		},
+		{
+			name:    "one after minimum_request_epoch then one before",
+			nblocks: 2,
+			expired: map[int]bool{1: true},
+			chain:   dmc,
+			err:     p2pTypes.ErrBlobLTMinRequest,
+		},
+		{
+			name:    "one missing index, one after minimum_request_epoch then one before",
+			nblocks: 3,
+			missing: map[int]map[int]bool{0: map[int]bool{0: true}},
+			expired: map[int]bool{1: true},
+			chain:   dmc,
+			err:     p2pTypes.ErrBlobLTMinRequest,
+		},
+		{
+			name:    "2 missing indices from 2 different blocks",
+			nblocks: 3,
+			missing: map[int]map[int]bool{0: map[int]bool{0: true}, 2: map[int]bool{3: true}},
+			total:   func(i int) *int { return &i }(3*int(params.BeaconConfig().MaxBlobsPerBlock) - 2), // aka 10
+		},
+		{
+			name:    "all indices missing",
+			nblocks: 1,
+			missing: map[int]map[int]bool{0: map[int]bool{0: true, 1: true, 2: true, 3: true}},
+			total:   func(i int) *int { return &i }(0), // aka 10
+		},
+		{
+			name:    "block with all indices missing between 2 full blocks",
+			nblocks: 3,
+			missing: map[int]map[int]bool{1: map[int]bool{0: true, 1: true, 2: true, 3: true}},
+			total:   func(i int) *int { return &i }(8), // aka 10
+		},
+	}
+	for _, c := range cases {
+		t.Run(c.name, func(t *testing.T) {
+			c.run(t)
+		})
+	}
+}
+
+func TestSidecarsByRootOK(t *testing.T) {
+	cases := []sidecarsTestCase{
+		{
+			name:    "0 blob",
+			nblocks: 0,
+		},
+		{
+			name:    "1 blob",
+			nblocks: 1,
+		},
+		{
+			name:    "2 blob",
+			nblocks: 2,
+		},
+	}
+	for _, c := range cases {
+		t.Run(c.name, func(t *testing.T) {
+			c.run(t)
+		})
+	}
+}
+
+func TestBlobMinReqEpoch(t *testing.T) {
+	winMin := params.BeaconNetworkConfig().MinEpochsForBlobsSidecarsRequest
+	cases := []struct {
+		name      string
+		finalized types.Epoch
+		current   types.Epoch
+		deneb     types.Epoch
+		expected  types.Epoch
+	}{
+		{
+			name:      "testnet genesis",
+			deneb:     100,
+			current:   0,
+			finalized: 0,
+			expected:  100,
+		},
+		{
+			name:      "underflow averted",
+			deneb:     100,
+			current:   winMin - 1,
+			finalized: 0,
+			expected:  100,
+		},
+		{
+			name:      "underflow averted - finalized is higher",
+			deneb:     100,
+			current:   winMin - 1,
+			finalized: winMin - 2,
+			expected:  winMin - 2,
+		},
+		{
+			name:      "underflow averted - genesis at deneb",
+			deneb:     0,
+			current:   winMin - 1,
+			finalized: 0,
+			expected:  0,
+		},
+		{
+			name:      "max is finalized",
+			deneb:     100,
+			current:   99 + winMin,
+			finalized: 101,
+			expected:  101,
+		},
+		{
+			name:      "reqWindow > finalized, reqWindow < deneb",
+			deneb:     100,
+			current:   99 + winMin,
+			finalized: 98,
+			expected:  100,
+		},
+	}
+	for _, c := range cases {
+		t.Run(c.name, func(t *testing.T) {
+			cfg := params.BeaconConfig()
+			repositionFutureEpochs(cfg)
+			cfg.DenebForkEpoch = c.deneb
+			undo, err := params.SetActiveWithUndo(cfg)
+			require.NoError(t, err)
+			defer func() {
+				require.NoError(t, undo())
+			}()
+			ep := blobMinReqEpoch(c.finalized, c.current)
+			require.Equal(t, c.expected, ep)
+		})
+	}
+}

beacon-chain/sync/rpc_chunked_response.go

@@ -12,7 +12,9 @@ import (
 	"github.com/prysmaticlabs/prysm/v4/consensus-types/interfaces"
 	"github.com/prysmaticlabs/prysm/v4/encoding/bytesutil"
 	"github.com/prysmaticlabs/prysm/v4/network/forks"
+	ethpb "github.com/prysmaticlabs/prysm/v4/proto/prysm/v1alpha1"
 	"github.com/prysmaticlabs/prysm/v4/runtime/version"
+	"github.com/prysmaticlabs/prysm/v4/time/slots"
 )
 
 // chunkBlockWriter writes the given message as a chunked response to the given network
@@ -53,6 +55,20 @@ func WriteBlockChunk(stream libp2pcore.Stream, chain blockchain.ChainInfoFetcher
 			return err
 		}
 		obtainedCtx = digest[:]
+	case version.Capella:
+		valRoot := chain.GenesisValidatorsRoot()
+		digest, err := forks.ForkDigestFromEpoch(params.BeaconConfig().CapellaForkEpoch, valRoot[:])
+		if err != nil {
+			return err
+		}
+		obtainedCtx = digest[:]
+	case version.Deneb:
+		valRoot := chain.GenesisValidatorsRoot()
+		digest, err := forks.ForkDigestFromEpoch(params.BeaconConfig().DenebForkEpoch, valRoot[:])
+		if err != nil {
+			return err
+		}
+		obtainedCtx = digest[:]
 	}
 
 	if err := writeContextToStream(obtainedCtx, stream, chain); err != nil {
@@ -73,6 +89,25 @@ func ReadChunkedBlock(stream libp2pcore.Stream, chain blockchain.ForkFetcher, p2
 	return readResponseChunk(stream, chain, p2p)
 }
 
+// WriteBlobSidecarChunk writes blob chunk object to stream.
+// response_chunk  ::= <result> | <context-bytes> | <encoding-dependent-header> | <encoded-payload>
+func WriteBlobSidecarChunk(stream libp2pcore.Stream, chain blockchain.ChainInfoFetcher, encoding encoder.NetworkEncoding, sidecar *ethpb.BlobSidecar) error {
+	if _, err := stream.Write([]byte{responseCodeSuccess}); err != nil {
+		return err
+	}
+	valRoot := chain.GenesisValidatorsRoot()
+	ctxBytes, err := forks.ForkDigestFromEpoch(slots.ToEpoch(sidecar.GetSlot()), valRoot[:])
+	if err != nil {
+		return err
+	}
+
+	if err := writeContextToStream(ctxBytes[:], stream, chain); err != nil {
+		return err
+	}
+	_, err = encoding.EncodeWithMaxLength(stream, sidecar)
+	return err
+}
+
 // readFirstChunkedBlock reads the first chunked block and applies the appropriate deadlines to
 // it.
 func readFirstChunkedBlock(stream libp2pcore.Stream, chain blockchain.ForkFetcher, p2p p2p.EncodingProvider) (interfaces.ReadOnlySignedBeaconBlock, error) {

beacon-chain/sync/rpc_send_request.go

@@ -129,3 +129,30 @@ func SendBeaconBlocksByRootRequest(
 	}
 	return blocks, nil
 }
+
+func SendBlobSidecarByRoot(
+	ctx context.Context, ci blockchain.ChainInfoFetcher, p2pApi p2p.P2P, pid peer.ID,
+	req p2ptypes.BlobSidecarsByRootReq,
+) ([]*pb.BlobSidecar, error) {
+	topic, err := p2p.TopicFromMessage(p2p.BlobSidecarsByRootName, slots.ToEpoch(ci.CurrentSlot()))
+	if err != nil {
+		return nil, err
+	}
+	stream, err := p2pApi.Send(ctx, req, topic, pid)
+	if err != nil {
+		return nil, err
+	}
+	defer closeStream(stream, log)
+
+	sidecars := make([]*pb.BlobSidecar, 0, len(req))
+
+	max := params.BeaconNetworkConfig().MaxRequestBlobsSidecars * params.BeaconConfig().MaxBlobsPerBlock
+	for i := 0; i < len(req); i++ {
+		// Exit if peer sends more than MAX_REQUEST_BLOBS_SIDECARS.
+		if uint64(i) >= max {
+			break
+		}
+		// TODO: Read sidecar
+	}
+	return sidecars, nil
+}

beacon-chain/sync/service.go

@@ -34,6 +34,7 @@ import (
 	"github.com/prysmaticlabs/prysm/v4/beacon-chain/state/stategen"
 	lruwrpr "github.com/prysmaticlabs/prysm/v4/cache/lru"
 	"github.com/prysmaticlabs/prysm/v4/config/params"
+	leakybucket "github.com/prysmaticlabs/prysm/v4/container/leaky-bucket"
 	ethpb "github.com/prysmaticlabs/prysm/v4/proto/prysm/v1alpha1"
 	"github.com/prysmaticlabs/prysm/v4/runtime"
 	prysmTime "github.com/prysmaticlabs/prysm/v4/time"
@@ -139,6 +140,8 @@ type Service struct {
 	syncContributionBitsOverlapLock  sync.RWMutex
 	syncContributionBitsOverlapCache *lru.Cache
 	signatureChan                    chan *signatureVerifier
+	blobs                            BlobDB
+	blockAndBlobs                    *blockAndBlocksQueue
 }
 
 // NewService initializes new regular sync service.
@@ -154,6 +157,7 @@ func NewService(ctx context.Context, opts ...Option) *Service {
 		seenPendingBlocks:    make(map[[32]byte]bool),
 		blkRootToPendingAtts: make(map[[32]byte][]*ethpb.SignedAggregateAttestationAndProof),
 		signatureChan:        make(chan *signatureVerifier, verifierLimit),
+		blockAndBlobs:        newBlockAndBlobs(),
 	}
 	for _, opt := range opts {
 		if err := opt(r); err != nil {
@@ -287,6 +291,10 @@ func (s *Service) registerHandlers() {
 	}
 }
 
+func (s *Service) setRateCollector(topic string, c *leakybucket.Collector) {
+	s.rateLimiter.limiterMap[topic] = c
+}
+
 // marks the chain as having started.
 func (s *Service) markForChainStart() {
 	s.chainStarted.Set()

beacon-chain/sync/subscriber.go

@@ -87,6 +87,7 @@ func (s *Service) registerSubscribers(epoch primitives.Epoch, digest [4]byte) {
 			s.validateCommitteeIndexBeaconAttestation,   /* validator */
 			s.committeeIndexBeaconAttestationSubscriber, /* message handler */
 			digest,
+			params.BeaconNetworkConfig().AttestationSubnetCount,
 		)
 	} else {
 		s.subscribeDynamicWithSubnets(
@@ -130,6 +131,17 @@ func (s *Service) registerSubscribers(epoch primitives.Epoch, digest [4]byte) {
 			digest,
 		)
 	}
+
+	// New Gossip Topic in Deneb
+	if epoch >= params.BeaconConfig().DenebForkEpoch {
+		s.subscribeStaticWithSubnets(
+			p2p.BlobSubnetTopicFormat,
+			s.validateBlob,   /* validator */
+			s.blobSubscriber, /* message handler */
+			digest,
+			params.BeaconNetworkConfig().BlobSubnetCount,
+		)
+	}
 }
 
 // subscribe to a given topic with a given validator and subscription handler.
@@ -300,7 +312,7 @@ func (s *Service) wrapAndReportValidation(topic string, v wrappedVal) (string, p
 
 // subscribe to a static subnet  with the given topic and index.A given validator and subscription handler is
 // used to handle messages from the subnet. The base protobuf message is used to initialize new messages for decoding.
-func (s *Service) subscribeStaticWithSubnets(topic string, validator wrappedVal, handle subHandler, digest [4]byte) {
+func (s *Service) subscribeStaticWithSubnets(topic string, validator wrappedVal, handle subHandler, digest [4]byte, subnetCount uint64) {
 	genRoot := s.cfg.chain.GenesisValidatorsRoot()
 	_, e, err := forks.RetrieveForkDataFromDigest(digest, genRoot[:])
 	if err != nil {
@@ -312,7 +324,7 @@ func (s *Service) subscribeStaticWithSubnets(topic string, validator wrappedVal,
 		// Impossible condition as it would mean topic does not exist.
 		panic(fmt.Sprintf("%s is not mapped to any message in GossipTopicMappings", topic))
 	}
-	for i := uint64(0); i < params.BeaconNetworkConfig().AttestationSubnetCount; i++ {
+	for i := uint64(0); i < subnetCount; i++ {
 		s.subscribeWithBase(s.addDigestAndIndexToTopic(topic, digest, i), validator, handle)
 	}
 	genesis := s.cfg.chain.GenesisTime()
@@ -336,7 +348,7 @@ func (s *Service) subscribeStaticWithSubnets(topic string, validator wrappedVal,
 				if !valid {
 					log.Warnf("Attestation subnets with digest %#x are no longer valid, unsubscribing from all of them.", digest)
 					// Unsubscribes from all our current subnets.
-					for i := uint64(0); i < params.BeaconNetworkConfig().AttestationSubnetCount; i++ {
+					for i := uint64(0); i < subnetCount; i++ {
 						fullTopic := fmt.Sprintf(topic, digest, i) + s.cfg.p2p.Encoding().ProtocolSuffix()
 						s.unSubscribeFromTopic(fullTopic)
 					}
@@ -344,7 +356,7 @@ func (s *Service) subscribeStaticWithSubnets(topic string, validator wrappedVal,
 					return
 				}
 				// Check every slot that there are enough peers
-				for i := uint64(0); i < params.BeaconNetworkConfig().AttestationSubnetCount; i++ {
+				for i := uint64(0); i < subnetCount; i++ {
 					if !s.validPeersExist(s.addDigestAndIndexToTopic(topic, digest, i)) {
 						log.Debugf("No peers found subscribed to attestation gossip subnet with "+
 							"committee index %d. Searching network for peers subscribed to the subnet.", i)

beacon-chain/sync/subscriber_beacon_blocks.go

@@ -3,9 +3,11 @@ package sync
 import (
 	"context"
 
+	"github.com/pkg/errors"
 	"github.com/prysmaticlabs/prysm/v4/beacon-chain/blockchain"
-	"github.com/prysmaticlabs/prysm/v4/beacon-chain/core/transition/interop"
 	"github.com/prysmaticlabs/prysm/v4/consensus-types/blocks"
+	"github.com/prysmaticlabs/prysm/v4/consensus-types/interfaces"
+	"github.com/prysmaticlabs/prysm/v4/runtime/version"
 	"google.golang.org/protobuf/proto"
 )
 
@@ -27,13 +29,64 @@ func (s *Service) beaconBlockSubscriber(ctx context.Context, msg proto.Message)
 		return err
 	}
 
+	if block.Version() >= version.Deneb {
+		if err := s.blockAndBlobs.addBlock(signed); err != nil {
+			return err
+		}
+		if err := s.importBlockAndBlobs(ctx, root); err != nil {
+			return errors.Wrap(err, "could not import block and blobs")
+		}
+	}
+
+	return s.receiveBlock(ctx, signed, root)
+}
+
+func (s *Service) importBlockAndBlobs(ctx context.Context, root [32]byte) error {
+	canImport, err := s.blockAndBlobs.canImport(root)
+	if err != nil {
+		return err
+	}
+	if !canImport {
+		return nil
+	}
+	return s.receiveBlockAndBlobs(ctx, root)
+}
+
+func (s *Service) receiveBlockAndBlobs(ctx context.Context, root [32]byte) error {
+	signed, err := s.blockAndBlobs.getBlock(root)
+	if err != nil {
+		return err
+	}
+	if err = s.receiveBlock(ctx, signed, root); err != nil {
+		return err
+	}
+	kzgs, err := signed.Block().Body().BlobKzgCommitments()
+	if err != nil {
+		return err
+	}
+	for i := 0; i < len(kzgs); i++ {
+		index := uint64(i)
+		sb, err := s.blockAndBlobs.getBlob(root, index)
+		if err != nil {
+			return err
+		}
+		if err := s.blobs.WriteBlobSidecar(root, index, sb); err != nil {
+			return err
+		}
+	}
+
+	s.blockAndBlobs.delete(root)
+
+	return nil
+}
+
+func (s *Service) receiveBlock(ctx context.Context, signed interfaces.ReadOnlySignedBeaconBlock, root [32]byte) error {
 	if err := s.cfg.chain.ReceiveBlock(ctx, signed, root); err != nil {
 		if blockchain.IsInvalidBlock(err) {
 			r := blockchain.InvalidBlockRoot(err)
 			if r != [32]byte{} {
 				s.setBadBlock(ctx, r) // Setting head block as bad.
 			} else {
-				interop.WriteBlockToDisk(signed, true /*failed*/)
 				s.setBadBlock(ctx, root)
 			}
 		}
@@ -43,5 +96,5 @@ func (s *Service) beaconBlockSubscriber(ctx context.Context, msg proto.Message)
 		}
 		return err
 	}
-	return err
+	return nil
 }

beacon-chain/sync/subscriber_blob_sidecar.go

@@ -0,0 +1,28 @@
+package sync
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/pkg/errors"
+	"github.com/prysmaticlabs/prysm/v4/encoding/bytesutil"
+	eth "github.com/prysmaticlabs/prysm/v4/proto/prysm/v1alpha1"
+	"google.golang.org/protobuf/proto"
+)
+
+func (s *Service) blobSubscriber(ctx context.Context, msg proto.Message) error {
+	b, ok := msg.(*eth.SignedBlobSidecar)
+	if !ok {
+		return fmt.Errorf("message was not type *eth.Attestation, type=%T", msg)
+	}
+
+	if err := s.blockAndBlobs.addBlob(b.Message); err != nil {
+		return errors.Wrap(err, "could not add blob to queue")
+	}
+
+	if err := s.importBlockAndBlobs(ctx, bytesutil.ToBytes32(b.Message.BlockRoot)); err != nil {
+		return errors.Wrap(err, "could not import block and blobs")
+	}
+
+	return nil
+}

beacon-chain/sync/subscriber_test.go

@@ -318,7 +318,7 @@ func TestStaticSubnets(t *testing.T) {
 	r.subscribeStaticWithSubnets(defaultTopic, r.noopValidator, func(_ context.Context, msg proto.Message) error {
 		// no-op
 		return nil
-	}, d)
+	}, d, 64)
 	topics := r.cfg.p2p.PubSub().GetTopics()
 	if uint64(len(topics)) != params.BeaconNetworkConfig().AttestationSubnetCount {
 		t.Errorf("Wanted the number of subnet topics registered to be %d but got %d", params.BeaconNetworkConfig().AttestationSubnetCount, len(topics))

beacon-chain/sync/validate_blob.go

@@ -0,0 +1,174 @@
+package sync
+
+import (
+	"context"
+	"fmt"
+	"strings"
+
+	pubsub "github.com/libp2p/go-libp2p-pubsub"
+	"github.com/libp2p/go-libp2p/core/peer"
+	"github.com/prysmaticlabs/prysm/v4/beacon-chain/core/helpers"
+	"github.com/prysmaticlabs/prysm/v4/beacon-chain/core/signing"
+	"github.com/prysmaticlabs/prysm/v4/beacon-chain/core/transition"
+	"github.com/prysmaticlabs/prysm/v4/beacon-chain/state"
+	"github.com/prysmaticlabs/prysm/v4/config/params"
+	"github.com/prysmaticlabs/prysm/v4/crypto/bls"
+	"github.com/prysmaticlabs/prysm/v4/encoding/bytesutil"
+	"github.com/prysmaticlabs/prysm/v4/network/forks"
+	eth "github.com/prysmaticlabs/prysm/v4/proto/prysm/v1alpha1"
+	"github.com/prysmaticlabs/prysm/v4/time/slots"
+	"github.com/sirupsen/logrus"
+)
+
+func (s *Service) validateBlob(ctx context.Context, pid peer.ID, msg *pubsub.Message) (pubsub.ValidationResult, error) {
+	if pid == s.cfg.p2p.PeerID() {
+		return pubsub.ValidationAccept, nil
+	}
+	if s.cfg.initialSync.Syncing() {
+		return pubsub.ValidationIgnore, nil
+	}
+	if msg.Topic == nil {
+		return pubsub.ValidationReject, errInvalidTopic
+	}
+	m, err := s.decodePubsubMessage(msg)
+	if err != nil {
+		return pubsub.ValidationReject, err
+	}
+
+	sBlob, ok := m.(*eth.SignedBlobSidecar)
+	if !ok {
+		return pubsub.ValidationReject, errWrongMessage
+	}
+	blob := sBlob.Message
+
+	// [REJECT] The sidecar is for the correct topic -- i.e. sidecar.index matches the topic {index}.
+	want := fmt.Sprintf("blob_sidecar_%d", blob.Index)
+	if !strings.Contains(*msg.Topic, want) {
+		log.WithFields(blobFields(blob)).Error("Sidecar blob does not match topic")
+		return pubsub.ValidationReject, fmt.Errorf("wrong topic name: %s", *msg.Topic)
+	}
+
+	// [IGNORE] The sidecar is not from a future slot (with a MAXIMUM_GOSSIP_CLOCK_DISPARITY allowance) --
+	// i.e. validate that sidecar.slot <= current_slot (a client MAY queue future blocks for processing at the appropriate slot).
+	genesisTime := uint64(s.cfg.chain.GenesisTime().Unix())
+	if err := slots.VerifyTime(genesisTime, blob.Slot, earlyBlockProcessingTolerance); err != nil {
+		log.WithError(err).WithFields(blobFields(blob)).Error("Ignored blob: too far into future")
+		return pubsub.ValidationIgnore, err
+	}
+
+	// [IGNORE] The sidecar is from a slot greater than the latest finalized slot --
+	// i.e. validate that sidecar.slot > compute_start_slot_at_epoch(state.finalized_checkpoint.epoch)
+	startSlot, err := slots.EpochStart(s.cfg.chain.FinalizedCheckpt().Epoch)
+	if err != nil {
+		log.WithError(err).WithFields(blobFields(blob)).Error("Ignored block: could not calculate epoch start slot")
+		return pubsub.ValidationIgnore, err
+	}
+	if startSlot >= blob.Slot {
+		err := fmt.Errorf("finalized slot %d greater or equal to blob slot %d", startSlot, blob.Slot)
+		log.WithFields(blobFields(blob)).Debug(err)
+		return pubsub.ValidationIgnore, err
+	}
+
+	// [IGNORE] The blob's block's parent (defined by sidecar.block_parent_root) has been seen (via both gossip and non-gossip sources)
+	parentRoot := bytesutil.ToBytes32(blob.BlockParentRoot)
+	if !s.cfg.chain.HasBlock(ctx, parentRoot) {
+		if err := s.blockAndBlobs.addBlob(sBlob.Message); err != nil {
+			log.WithError(err).WithFields(blobFields(blob)).Error("Failed to add blob to queue")
+			return pubsub.ValidationIgnore, err
+		}
+		log.WithFields(blobFields(blob)).Warn("Ignored blob: parent block not found")
+		return pubsub.ValidationIgnore, nil
+	}
+
+	// [REJECT] The sidecar's block's parent (defined by sidecar.block_parent_root) passes validation.
+	// TODO: I'm not sure how to deal with this special case.
+
+	// [REJECT] The sidecar is from a higher slot than the sidecar's block's parent (defined by sidecar.block_parent_root).
+	blk, err := s.cfg.beaconDB.Block(ctx, parentRoot)
+	if err != nil {
+		log.WithError(err).WithFields(blobFields(blob)).Error("Failed to get parent block")
+		return pubsub.ValidationIgnore, err
+	}
+	if blk.Block().Slot() >= blob.Slot {
+		err := fmt.Errorf("parent block slot %d greater or equal to blob slot %d", blk.Block().Slot(), blob.Slot)
+		log.WithFields(blobFields(blob)).Debug(err)
+		return pubsub.ValidationReject, err
+	}
+
+	// [REJECT] The proposer signature, signed_blob_sidecar.signature,
+	// is valid with respect to the sidecar.proposer_index pubkey.
+	parentState, err := s.cfg.stateGen.StateByRoot(ctx, parentRoot)
+	if err != nil {
+		return pubsub.ValidationIgnore, err
+	}
+	if err := verifyBlobSignature(parentState, sBlob); err != nil {
+		log.WithError(err).WithFields(blobFields(blob)).Error("Failed to verify blob signature")
+		return pubsub.ValidationReject, err
+	}
+
+	// [IGNORE] The sidecar is the only sidecar with valid signature received for the tuple (sidecar.block_root, sidecar.index).
+	blockRoot := bytesutil.ToBytes32(blob.BlockRoot)
+	b, err := s.blockAndBlobs.getBlob(blockRoot, blob.Index)
+	if err == nil || b != nil {
+		log.WithFields(blobFields(blob)).Warn("Ignored blob: blob already exists")
+		return pubsub.ValidationIgnore, nil
+	}
+
+	// [REJECT] The sidecar is proposed by the expected proposer_index for the block's slot in the context of the current shuffling (defined by block_parent_root/slot)
+	parentState, err = transition.ProcessSlotsUsingNextSlotCache(ctx, parentState, parentRoot[:], blob.Slot)
+	if err != nil {
+		return pubsub.ValidationIgnore, err
+	}
+	idx, err := helpers.BeaconProposerIndex(ctx, parentState)
+	if err != nil {
+		return pubsub.ValidationIgnore, err
+	}
+	if blob.ProposerIndex != idx {
+		err := fmt.Errorf("expected proposer index %d, got %d", idx, blob.ProposerIndex)
+		log.WithFields(blobFields(blob)).Error(err)
+		return pubsub.ValidationReject, err
+	}
+
+	return pubsub.ValidationAccept, nil
+}
+
+func verifyBlobSignature(st state.BeaconState, blob *eth.SignedBlobSidecar) error {
+	currentEpoch := slots.ToEpoch(blob.Message.Slot)
+	fork, err := forks.Fork(currentEpoch)
+	if err != nil {
+		return err
+	}
+	domain, err := signing.Domain(fork, currentEpoch, params.BeaconConfig().DomainBeaconProposer, st.GenesisValidatorsRoot())
+	if err != nil {
+		return err
+	}
+	proposer, err := st.ValidatorAtIndex(blob.Message.ProposerIndex)
+	if err != nil {
+		return err
+	}
+	pb, err := bls.PublicKeyFromBytes(proposer.PublicKey)
+	if err != nil {
+		return err
+	}
+	sig, err := bls.SignatureFromBytes(blob.Signature)
+	if err != nil {
+		return err
+	}
+	sr, err := signing.ComputeSigningRoot(blob.Message, domain)
+	if err != nil {
+		return err
+	}
+	if !sig.Verify(pb, sr[:]) {
+		return signing.ErrSigFailedToVerify
+	}
+	return nil
+}
+
+func blobFields(b *eth.BlobSidecar) logrus.Fields {
+	return logrus.Fields{
+		"slot":          b.Slot,
+		"proposerIndex": b.ProposerIndex,
+		"blockRoot":     fmt.Sprintf("%#x", b.BlockRoot),
+		"index":         b.Index,
+	}
+}

config/fieldparams/mainnet.go

@@ -26,4 +26,5 @@ const (
 	SyncCommitteeAggregationBytesLength   = 16            // SyncCommitteeAggregationBytesLength defines the length of sync committee aggregate bytes.
 	SyncAggregateSyncCommitteeBytesLength = 64            // SyncAggregateSyncCommitteeBytesLength defines the length of sync committee bytes in a sync aggregate.
 	MaxWithdrawalsPerPayload              = 16            // MaxWithdrawalsPerPayloadLength defines the maximum number of withdrawals that can be included in a payload.
+	BlobSize                              = 131072        // defined to match blobs.size in bazel ssz codegen
 )

config/fieldparams/minimal.go

@@ -26,4 +26,5 @@ const (
 	SyncCommitteeAggregationBytesLength   = 1             // SyncCommitteeAggregationBytesLength defines the sync committee aggregate bytes.
 	SyncAggregateSyncCommitteeBytesLength = 4             // SyncAggregateSyncCommitteeBytesLength defines the length of sync committee bytes in a sync aggregate.
 	MaxWithdrawalsPerPayload              = 4             // MaxWithdrawalsPerPayloadLength defines the maximum number of withdrawals that can be included in a payload.
+	BlobSize                              = 131072        // defined to match blobs.size in bazel ssz codegen
 )

config/params/config.go

@@ -119,6 +119,7 @@ type BeaconChainConfig struct {
 	DomainApplicationMask             [4]byte `yaml:"DOMAIN_APPLICATION_MASK" spec:"true"`               // DomainApplicationMask defines the BLS signature domain for application mask.
 	DomainApplicationBuilder          [4]byte // DomainApplicationBuilder defines the BLS signature domain for application builder.
 	DomainBLSToExecutionChange        [4]byte // DomainBLSToExecutionChange defines the BLS signature domain to change withdrawal addresses to ETH1 prefix
+	DomainBlobSidecar                 [4]byte `yaml:"DOMAIN_BLOB_SIDECAR" spec:"true"` // DomainBlobSidecar defines the BLS signature domain for blob sidecar.
 
 	// Prysm constants.
 	GweiPerEth                     uint64          // GweiPerEth is the amount of gwei corresponding to 1 eth.
@@ -153,6 +154,8 @@ type BeaconChainConfig struct {
 	BellatrixForkEpoch   primitives.Epoch `yaml:"BELLATRIX_FORK_EPOCH" spec:"true"`   // BellatrixForkEpoch is used to represent the assigned fork epoch for bellatrix.
 	CapellaForkVersion   []byte           `yaml:"CAPELLA_FORK_VERSION" spec:"true"`   // CapellaForkVersion is used to represent the fork version for capella.
 	CapellaForkEpoch     primitives.Epoch `yaml:"CAPELLA_FORK_EPOCH" spec:"true"`     // CapellaForkEpoch is used to represent the assigned fork epoch for capella.
+	DenebForkVersion     []byte           `yaml:"DENEB_FORK_VERSION" spec:"true"`     // DenebForkVersion is used to represent the fork version for Deneb.
+	DenebForkEpoch       primitives.Epoch `yaml:"DENEB_FORK_EPOCH" spec:"true"`       // DenebForkEpoch is used to represent the assigned fork epoch for Deneb.
 
 	ForkVersionSchedule map[[fieldparams.VersionLength]byte]primitives.Epoch // Schedule of fork epochs by version.
 	ForkVersionNames    map[[fieldparams.VersionLength]byte]string           // Human-readable names of fork versions.
@@ -210,6 +213,9 @@ type BeaconChainConfig struct {
 
 	// Execution engine timeout value
 	ExecutionEngineTimeoutValue uint64 // ExecutionEngineTimeoutValue defines the seconds to wait before timing out engine endpoints with execution payload execution semantics (newPayload, forkchoiceUpdated).
+
+	// Deneb presets
+	MaxBlobsPerBlock uint64
 }
 
 // InitializeForkSchedule initializes the schedules forks baked into the config.
@@ -224,7 +230,10 @@ func configForkSchedule(b *BeaconChainConfig) map[[fieldparams.VersionLength]byt
 	fvs[bytesutil.ToBytes4(b.GenesisForkVersion)] = b.GenesisEpoch
 	fvs[bytesutil.ToBytes4(b.AltairForkVersion)] = b.AltairForkEpoch
 	fvs[bytesutil.ToBytes4(b.BellatrixForkVersion)] = b.BellatrixForkEpoch
+	// Set Capella fork data.
 	fvs[bytesutil.ToBytes4(b.CapellaForkVersion)] = b.CapellaForkEpoch
+	// Set Deneb fork data.
+	fvs[bytesutil.ToBytes4(b.DenebForkVersion)] = b.DenebForkEpoch
 	return fvs
 }
 
@@ -233,7 +242,10 @@ func configForkNames(b *BeaconChainConfig) map[[fieldparams.VersionLength]byte]s
 	fvn[bytesutil.ToBytes4(b.GenesisForkVersion)] = "phase0"
 	fvn[bytesutil.ToBytes4(b.AltairForkVersion)] = "altair"
 	fvn[bytesutil.ToBytes4(b.BellatrixForkVersion)] = "bellatrix"
+	// Set Capella fork data.
 	fvn[bytesutil.ToBytes4(b.CapellaForkVersion)] = "capella"
+	// Set Deneb fork data.
+	fvn[bytesutil.ToBytes4(b.DenebForkVersion)] = "deneb"
 	return fvn
 }