epbs initial commit

.github/workflows/changelog.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout source code
-        uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744 # v3.6.0
+        uses: actions/checkout@v3
 
       - name: Download unclog binary
         uses: dsaltares/fetch-gh-release-asset@aa2ab1243d6e0d5b405b973c89fa4d06a2d0fff7 # 1.1.2
@@ -23,7 +23,7 @@ jobs:
 
       - name: Get new changelog files
         id: new-changelog-files
-        uses: OffchainLabs/gh-action-changed-files@9200e69727eb73eb060652b19946b8a2fdfb654b # v4.0.8
+        uses: tj-actions/changed-files@v45
         with:
           files: |
             changelog/**.md

api/client/beacon/BUILD.bazel

@@ -4,6 +4,7 @@ go_library(
     name = "go_default_library",
     srcs = [
         "client.go",
+        "client_epbs.go",
         "doc.go",
         "log.go",
         "template.go",

api/client/beacon/client.go

@@ -35,6 +35,7 @@ const (
 
 	GetNodeVersionPath      = "/eth/v1/node/version"
 	GetWeakSubjectivityPath = "/prysm/v1/beacon/weak_subjectivity"
+	getPayloadEnvelopePath  = "/eth/v1/beacon/execution_payload"
 )
 
 // StateOrBlockId represents the block_id / state_id parameters that several of the Eth Beacon API methods accept.

api/client/beacon/client_epbs.go

@@ -0,0 +1,22 @@
+package beacon
+
+import (
+	"context"
+
+	"github.com/OffchainLabs/prysm/v6/api/client"
+	"github.com/pkg/errors"
+)
+
+// GetExecutionPayload retrieves the SignedExecutionPayloadEnvelope for the given block id.
+// Block identifier can be one of: "head" (canonical head in node's view), "genesis", "finalized",
+// <slot>, <hex encoded blockRoot with 0x prefix>. Variables of type StateOrBlockId are exported by this package
+// for the named identifiers.
+// The return value contains the ssz-encoded bytes.
+func (c *Client) GetExecutionPayload(ctx context.Context, blockId StateOrBlockId) ([]byte, error) {
+	blockPath := RenderGetBlockPath(blockId)
+	b, err := c.Get(ctx, blockPath, client.WithSSZEncoding())
+	if err != nil {
+		return nil, errors.Wrapf(err, "error requesting execuction payload by id = %s", blockId)
+	}
+	return b, nil
+}

api/server/structs/BUILD.bazel

@@ -4,6 +4,7 @@ go_library(
     name = "go_default_library",
     srcs = [
         "block.go",
+        "block_epbs.go",
         "block_execution.go",
         "conversions.go",
         "conversions_blob.go",
@@ -11,6 +12,8 @@ go_library(
         "conversions_block_execution.go",
         "conversions_lightclient.go",
         "conversions_state.go",
+        "conversions_state_epbs.go",
+        "converstions_block_epbs.go",
         "endpoints_beacon.go",
         "endpoints_blob.go",
         "endpoints_builder.go",
@@ -23,6 +26,7 @@ go_library(
         "endpoints_validator.go",
         "other.go",
         "state.go",
+        "state_epbs.go",
     ],
     importpath = "github.com/OffchainLabs/prysm/v6/api/server/structs",
     visibility = ["//visibility:public"],

api/server/structs/block_epbs.go

@@ -0,0 +1,93 @@
+package structs
+
+import "encoding/json"
+
+// ----------------------------------------------------------------------------
+// Epbs
+// ----------------------------------------------------------------------------
+type SignedBeaconBlockEpbs struct {
+	Message   *BeaconBlockEpbs `json:"message"`
+	Signature string           `json:"signature"`
+}
+
+var _ SignedMessageJsoner = &SignedBeaconBlockElectra{}
+
+func (s *SignedBeaconBlockEpbs) MessageRawJson() ([]byte, error) {
+	return json.Marshal(s.Message)
+}
+
+func (s *SignedBeaconBlockEpbs) SigString() string {
+	return s.Signature
+}
+
+type BeaconBlockEpbs struct {
+	Slot          string               `json:"slot"`
+	ProposerIndex string               `json:"proposer_index"`
+	ParentRoot    string               `json:"parent_root"`
+	StateRoot     string               `json:"state_root"`
+	Body          *BeaconBlockBodyEpbs `json:"body"`
+}
+
+type BeaconBlockBodyEpbs struct {
+	RandaoReveal                 string                        `json:"randao_reveal"`
+	Eth1Data                     *Eth1Data                     `json:"eth1_data"`
+	Graffiti                     string                        `json:"graffiti"`
+	ProposerSlashings            []*ProposerSlashing           `json:"proposer_slashings"`
+	AttesterSlashings            []*AttesterSlashingElectra    `json:"attester_slashings"`
+	Attestations                 []*AttestationElectra         `json:"attestations"`
+	Deposits                     []*Deposit                    `json:"deposits"`
+	VoluntaryExits               []*SignedVoluntaryExit        `json:"voluntary_exits"`
+	SyncAggregate                *SyncAggregate                `json:"sync_aggregate"`
+	BLSToExecutionChanges        []*SignedBLSToExecutionChange `json:"bls_to_execution_changes"`
+	SignedExecutionPayloadHeader *SignedExecutionPayloadHeader `json:"signed_execution_payload_header"`
+	PayloadAttestations          []*PayloadAttestation         `json:"payload_attestations"`
+}
+
+type SignedExecutionPayloadEnvelope struct {
+	Message   *ExecutionPayloadEnvelope `json:"message"`
+	Signature string                    `json:"signature"`
+}
+
+type ExecutionPayloadEnvelope struct {
+	Payload            *ExecutionPayloadDeneb `json:"payload"`
+	ExecutionRequests  *ExecutionRequests     `json:"execution_requests"`
+	BuilderIndex       string                 `json:"builder_index"`
+	BeaconBlockRoot    string                 `json:"beacon_block_root"`
+	Slot               string                 `json:"slot"`
+	BlobKzgCommitments []string               `json:"blob_kzg_commitments"`
+	StateRoot          string                 `json:"state_root"`
+}
+type SignedExecutionPayloadHeader struct {
+	Message   *ExecutionPayloadHeaderEPBS `json:"message"`
+	Signature string                      `json:"signature"`
+}
+
+type ExecutionPayloadHeaderEPBS struct {
+	ParentBlockHash        string `json:"parent_block_hash"`
+	ParentBlockRoot        string `json:"parent_block_root"`
+	BlockHash              string `json:"block_hash"`
+	GasLimit               string `json:"gas_limit"`
+	BuilderIndex           string `json:"builder_index"`
+	Slot                   string `json:"slot"`
+	Value                  string `json:"value"`
+	BlobKzgCommitmentsRoot string `json:"blob_kzg_commitments_root"`
+}
+
+type PayloadAttestation struct {
+	AggregationBits string                  `json:"aggregation_bits"`
+	Data            *PayloadAttestationData `json:"data"`
+	Signature       string                  `json:"signature"`
+}
+
+type PayloadAttestationData struct {
+	BeaconBlockRoot string `json:"beacon_block_root"`
+	Slot            string `json:"slot"`
+	PayloadStatus   string `json:"payload_status"`
+}
+
+type GetExecutionPayloadV1Response struct {
+	Version             string                          `json:"version"`
+	ExecutionOptimistic bool                            `json:"execution_optimistic"`
+	Finalized           bool                            `json:"finalized"`
+	Data                *SignedExecutionPayloadEnvelope `json:"data"`
+}

api/server/structs/conversions_block.go

@@ -268,6 +268,8 @@ func SignedBeaconBlockMessageJsoner(block interfaces.ReadOnlySignedBeaconBlock)
 		return SignedBlindedBeaconBlockFuluFromConsensus(pbStruct)
 	case *eth.SignedBeaconBlockFulu:
 		return SignedBeaconBlockFuluFromConsensus(pbStruct)
+	case *eth.SignedBeaconBlockEpbs:
+		return SignedBeaconBlockEpbsFromConsensus(pbStruct)
 	default:
 		return nil, ErrUnsupportedConversion
 	}

api/server/structs/conversions_state_epbs.go

@@ -0,0 +1,202 @@
+package structs
+
+import (
+	"fmt"
+
+	beaconState "github.com/OffchainLabs/prysm/v6/beacon-chain/state"
+	"github.com/ethereum/go-ethereum/common/hexutil"
+)
+
+// ----------------------------------------------------------------------------
+// Fulu
+// ----------------------------------------------------------------------------
+
+func BeaconStateEPBSFromConsensus(st beaconState.BeaconState) (*BeaconStateEPBS, error) {
+	srcBr := st.BlockRoots()
+	br := make([]string, len(srcBr))
+	for i, r := range srcBr {
+		br[i] = hexutil.Encode(r)
+	}
+	srcSr := st.StateRoots()
+	sr := make([]string, len(srcSr))
+	for i, r := range srcSr {
+		sr[i] = hexutil.Encode(r)
+	}
+	srcHr := st.HistoricalRoots()
+	hr := make([]string, len(srcHr))
+	for i, r := range srcHr {
+		hr[i] = hexutil.Encode(r)
+	}
+	srcVotes := st.Eth1DataVotes()
+	votes := make([]*Eth1Data, len(srcVotes))
+	for i, e := range srcVotes {
+		votes[i] = Eth1DataFromConsensus(e)
+	}
+	srcVals := st.Validators()
+	vals := make([]*Validator, len(srcVals))
+	for i, v := range srcVals {
+		vals[i] = ValidatorFromConsensus(v)
+	}
+	srcBals := st.Balances()
+	bals := make([]string, len(srcBals))
+	for i, b := range srcBals {
+		bals[i] = fmt.Sprintf("%d", b)
+	}
+	srcRm := st.RandaoMixes()
+	rm := make([]string, len(srcRm))
+	for i, m := range srcRm {
+		rm[i] = hexutil.Encode(m)
+	}
+	srcSlashings := st.Slashings()
+	slashings := make([]string, len(srcSlashings))
+	for i, s := range srcSlashings {
+		slashings[i] = fmt.Sprintf("%d", s)
+	}
+	srcPrevPart, err := st.PreviousEpochParticipation()
+	if err != nil {
+		return nil, err
+	}
+	prevPart := make([]string, len(srcPrevPart))
+	for i, p := range srcPrevPart {
+		prevPart[i] = fmt.Sprintf("%d", p)
+	}
+	srcCurrPart, err := st.CurrentEpochParticipation()
+	if err != nil {
+		return nil, err
+	}
+	currPart := make([]string, len(srcCurrPart))
+	for i, p := range srcCurrPart {
+		currPart[i] = fmt.Sprintf("%d", p)
+	}
+	srcIs, err := st.InactivityScores()
+	if err != nil {
+		return nil, err
+	}
+	is := make([]string, len(srcIs))
+	for i, s := range srcIs {
+		is[i] = fmt.Sprintf("%d", s)
+	}
+	currSc, err := st.CurrentSyncCommittee()
+	if err != nil {
+		return nil, err
+	}
+	nextSc, err := st.NextSyncCommittee()
+	if err != nil {
+		return nil, err
+	}
+	srcPayload, err := st.LatestExecutionPayloadHeaderEPBS()
+	if err != nil {
+		return nil, err
+	}
+	payload, err := ExecutionPayloadHeaderEPBSFromConsensus(srcPayload)
+	if err != nil {
+		return nil, err
+	}
+	srcHs, err := st.HistoricalSummaries()
+	if err != nil {
+		return nil, err
+	}
+	hs := make([]*HistoricalSummary, len(srcHs))
+	for i, s := range srcHs {
+		hs[i] = HistoricalSummaryFromConsensus(s)
+	}
+	nwi, err := st.NextWithdrawalIndex()
+	if err != nil {
+		return nil, err
+	}
+	nwvi, err := st.NextWithdrawalValidatorIndex()
+	if err != nil {
+		return nil, err
+	}
+	drsi, err := st.DepositRequestsStartIndex()
+	if err != nil {
+		return nil, err
+	}
+	dbtc, err := st.DepositBalanceToConsume()
+	if err != nil {
+		return nil, err
+	}
+	ebtc, err := st.ExitBalanceToConsume()
+	if err != nil {
+		return nil, err
+	}
+	eee, err := st.EarliestExitEpoch()
+	if err != nil {
+		return nil, err
+	}
+	cbtc, err := st.ConsolidationBalanceToConsume()
+	if err != nil {
+		return nil, err
+	}
+	ece, err := st.EarliestConsolidationEpoch()
+	if err != nil {
+		return nil, err
+	}
+	pbd, err := st.PendingDeposits()
+	if err != nil {
+		return nil, err
+	}
+	ppw, err := st.PendingPartialWithdrawals()
+	if err != nil {
+		return nil, err
+	}
+	pc, err := st.PendingConsolidations()
+	if err != nil {
+		return nil, err
+	}
+	latestBlockHash, err := st.LatestBlockHash()
+	if err != nil {
+		return nil, err
+	}
+	latestFullSlot, err := st.LatestFullSlot()
+	if err != nil {
+		return nil, err
+	}
+	latestWithdrawalsRoot, err := st.LastWithdrawalsRoot()
+	if err != nil {
+		return nil, err
+	}
+
+	return &BeaconStateEPBS{
+		GenesisTime:                   fmt.Sprintf("%d", st.GenesisTime().Unix()),
+		GenesisValidatorsRoot:         hexutil.Encode(st.GenesisValidatorsRoot()),
+		Slot:                          fmt.Sprintf("%d", st.Slot()),
+		Fork:                          ForkFromConsensus(st.Fork()),
+		LatestBlockHeader:             BeaconBlockHeaderFromConsensus(st.LatestBlockHeader()),
+		BlockRoots:                    br,
+		StateRoots:                    sr,
+		HistoricalRoots:               hr,
+		Eth1Data:                      Eth1DataFromConsensus(st.Eth1Data()),
+		Eth1DataVotes:                 votes,
+		Eth1DepositIndex:              fmt.Sprintf("%d", st.Eth1DepositIndex()),
+		Validators:                    vals,
+		Balances:                      bals,
+		RandaoMixes:                   rm,
+		Slashings:                     slashings,
+		PreviousEpochParticipation:    prevPart,
+		CurrentEpochParticipation:     currPart,
+		JustificationBits:             hexutil.Encode(st.JustificationBits()),
+		PreviousJustifiedCheckpoint:   CheckpointFromConsensus(st.PreviousJustifiedCheckpoint()),
+		CurrentJustifiedCheckpoint:    CheckpointFromConsensus(st.CurrentJustifiedCheckpoint()),
+		FinalizedCheckpoint:           CheckpointFromConsensus(st.FinalizedCheckpoint()),
+		InactivityScores:              is,
+		CurrentSyncCommittee:          SyncCommitteeFromConsensus(currSc),
+		NextSyncCommittee:             SyncCommitteeFromConsensus(nextSc),
+		LatestExecutionPayloadHeader:  payload,
+		NextWithdrawalIndex:           fmt.Sprintf("%d", nwi),
+		NextWithdrawalValidatorIndex:  fmt.Sprintf("%d", nwvi),
+		HistoricalSummaries:           hs,
+		DepositRequestsStartIndex:     fmt.Sprintf("%d", drsi),
+		DepositBalanceToConsume:       fmt.Sprintf("%d", dbtc),
+		ExitBalanceToConsume:          fmt.Sprintf("%d", ebtc),
+		EarliestExitEpoch:             fmt.Sprintf("%d", eee),
+		ConsolidationBalanceToConsume: fmt.Sprintf("%d", cbtc),
+		EarliestConsolidationEpoch:    fmt.Sprintf("%d", ece),
+		PendingDeposits:               PendingDepositsFromConsensus(pbd),
+		PendingPartialWithdrawals:     PendingPartialWithdrawalsFromConsensus(ppw),
+		PendingConsolidations:         PendingConsolidationsFromConsensus(pc),
+		LatestBlockHash:               hexutil.Encode(latestBlockHash),
+		LatestFullSlot:                fmt.Sprintf("%d", latestFullSlot),
+		LatestWithdrawalsRoot:         hexutil.Encode(latestWithdrawalsRoot),
+	}, nil
+}

api/server/structs/converstions_block_epbs.go

@@ -0,0 +1,397 @@
+package structs
+
+import (
+	"fmt"
+	"strconv"
+
+	"github.com/OffchainLabs/prysm/v6/api/server"
+	fieldparams "github.com/OffchainLabs/prysm/v6/config/fieldparams"
+	"github.com/OffchainLabs/prysm/v6/consensus-types/primitives"
+	"github.com/OffchainLabs/prysm/v6/encoding/bytesutil"
+	enginev1 "github.com/OffchainLabs/prysm/v6/proto/engine/v1"
+	eth "github.com/OffchainLabs/prysm/v6/proto/prysm/v1alpha1"
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/common/hexutil"
+)
+
+// ----------------------------------------------------------------------------
+// Epbs
+// ----------------------------------------------------------------------------
+
+// nolint:gocognit
+func (b *BeaconBlockEpbs) ToConsensus() (*eth.BeaconBlockEpbs, error) {
+	if b == nil {
+		return nil, errNilValue
+	}
+	if b.Body == nil {
+		return nil, server.NewDecodeError(errNilValue, "Body")
+	}
+	if b.Body.Eth1Data == nil {
+		return nil, server.NewDecodeError(errNilValue, "Body.Eth1Data")
+	}
+	if b.Body.SyncAggregate == nil {
+		return nil, server.NewDecodeError(errNilValue, "Body.SyncAggregate")
+	}
+	slot, err := strconv.ParseUint(b.Slot, 10, 64)
+	if err != nil {
+		return nil, server.NewDecodeError(err, "Slot")
+	}
+	proposerIndex, err := strconv.ParseUint(b.ProposerIndex, 10, 64)
+	if err != nil {
+		return nil, server.NewDecodeError(err, "ProposerIndex")
+	}
+	parentRoot, err := bytesutil.DecodeHexWithLength(b.ParentRoot, fieldparams.RootLength)
+	if err != nil {
+		return nil, server.NewDecodeError(err, "ParentRoot")
+	}
+	stateRoot, err := bytesutil.DecodeHexWithLength(b.StateRoot, fieldparams.RootLength)
+	if err != nil {
+		return nil, server.NewDecodeError(err, "StateRoot")
+	}
+	randaoReveal, err := bytesutil.DecodeHexWithLength(b.Body.RandaoReveal, fieldparams.BLSSignatureLength)
+	if err != nil {
+		return nil, server.NewDecodeError(err, "Body.RandaoReveal")
+	}
+	depositRoot, err := bytesutil.DecodeHexWithLength(b.Body.Eth1Data.DepositRoot, fieldparams.RootLength)
+	if err != nil {
+		return nil, server.NewDecodeError(err, "Body.Eth1Data.DepositRoot")
+	}
+	depositCount, err := strconv.ParseUint(b.Body.Eth1Data.DepositCount, 10, 64)
+	if err != nil {
+		return nil, server.NewDecodeError(err, "Body.Eth1Data.DepositCount")
+	}
+	blockHash, err := bytesutil.DecodeHexWithLength(b.Body.Eth1Data.BlockHash, common.HashLength)
+	if err != nil {
+		return nil, server.NewDecodeError(err, "Body.Eth1Data.BlockHash")
+	}
+	graffiti, err := bytesutil.DecodeHexWithLength(b.Body.Graffiti, fieldparams.RootLength)
+	if err != nil {
+		return nil, server.NewDecodeError(err, "Body.Graffiti")
+	}
+	proposerSlashings, err := ProposerSlashingsToConsensus(b.Body.ProposerSlashings)
+	if err != nil {
+		return nil, server.NewDecodeError(err, "Body.ProposerSlashings")
+	}
+	attesterSlashings, err := AttesterSlashingsElectraToConsensus(b.Body.AttesterSlashings)
+	if err != nil {
+		return nil, server.NewDecodeError(err, "Body.AttesterSlashings")
+	}
+	atts, err := AttsElectraToConsensus(b.Body.Attestations)
+	if err != nil {
+		return nil, server.NewDecodeError(err, "Body.Attestations")
+	}
+	deposits, err := DepositsToConsensus(b.Body.Deposits)
+	if err != nil {
+		return nil, server.NewDecodeError(err, "Body.Deposits")
+	}
+	exits, err := SignedExitsToConsensus(b.Body.VoluntaryExits)
+	if err != nil {
+		return nil, server.NewDecodeError(err, "Body.VoluntaryExits")
+	}
+	syncCommitteeBits, err := bytesutil.DecodeHexWithLength(b.Body.SyncAggregate.SyncCommitteeBits, fieldparams.SyncAggregateSyncCommitteeBytesLength)
+	if err != nil {
+		return nil, server.NewDecodeError(err, "Body.SyncAggregate.SyncCommitteeBits")
+	}
+	syncCommitteeSig, err := bytesutil.DecodeHexWithLength(b.Body.SyncAggregate.SyncCommitteeSignature, fieldparams.BLSSignatureLength)
+	if err != nil {
+		return nil, server.NewDecodeError(err, "Body.SyncAggregate.SyncCommitteeSignature")
+	}
+	signedPayloadHeader, err := b.Body.SignedExecutionPayloadHeader.ToConsensus()
+	if err != nil {
+		return nil, server.NewDecodeError(err, "Body.SignedExecutionPayloadHeader")
+	}
+
+	blsChanges, err := SignedBLSChangesToConsensus(b.Body.BLSToExecutionChanges)
+	if err != nil {
+		return nil, server.NewDecodeError(err, "Body.BLSToExecutionChanges")
+	}
+	payloadAttestations := make([]*eth.PayloadAttestation, len(b.Body.PayloadAttestations))
+	for i, p := range b.Body.PayloadAttestations {
+		payloadAttestations[i], err = p.ToConsensus()
+		if err != nil {
+			return nil, server.NewDecodeError(err, fmt.Sprintf("Body.PayloadAttestations[%d]", i))
+		}
+	}
+
+	return &eth.BeaconBlockEpbs{
+		Slot:          primitives.Slot(slot),
+		ProposerIndex: primitives.ValidatorIndex(proposerIndex),
+		ParentRoot:    parentRoot,
+		StateRoot:     stateRoot,
+		Body: &eth.BeaconBlockBodyEpbs{
+			RandaoReveal: randaoReveal,
+			Eth1Data: &eth.Eth1Data{
+				DepositRoot:  depositRoot,
+				DepositCount: depositCount,
+				BlockHash:    blockHash,
+			},
+			Graffiti:          graffiti,
+			ProposerSlashings: proposerSlashings,
+			AttesterSlashings: attesterSlashings,
+			Attestations:      atts,
+			Deposits:          deposits,
+			VoluntaryExits:    exits,
+			SyncAggregate: &eth.SyncAggregate{
+				SyncCommitteeBits:      syncCommitteeBits,
+				SyncCommitteeSignature: syncCommitteeSig,
+			},
+			BlsToExecutionChanges:        blsChanges,
+			SignedExecutionPayloadHeader: signedPayloadHeader,
+			PayloadAttestations:          payloadAttestations,
+		},
+	}, nil
+}
+
+func (p *PayloadAttestation) ToConsensus() (*eth.PayloadAttestation, error) {
+	if p == nil {
+		return nil, errNilValue
+	}
+	aggregationBits, err := bytesutil.DecodeHexWithLength(p.AggregationBits, fieldparams.PTCSize/8)
+	if err != nil {
+		return nil, server.NewDecodeError(err, "AggregationBits")
+	}
+	data, err := p.Data.ToConsensus()
+	if err != nil {
+		return nil, server.NewDecodeError(err, "Data")
+	}
+	sig, err := bytesutil.DecodeHexWithLength(p.Signature, fieldparams.BLSSignatureLength)
+	if err != nil {
+		return nil, server.NewDecodeError(err, "Signature")
+	}
+	return &eth.PayloadAttestation{
+		AggregationBits: aggregationBits,
+		Data:            data,
+		Signature:       sig,
+	}, nil
+}
+
+func (p *PayloadAttestationData) ToConsensus() (*eth.PayloadAttestationData, error) {
+	if p == nil {
+		return nil, errNilValue
+	}
+	beaconBlockRoot, err := bytesutil.DecodeHexWithLength(p.BeaconBlockRoot, fieldparams.RootLength)
+	if err != nil {
+		return nil, server.NewDecodeError(err, "BeaconBlockRoot")
+	}
+	slot, err := strconv.ParseUint(p.Slot, 10, 64)
+	if err != nil {
+		return nil, server.NewDecodeError(err, "Slot")
+	}
+	payloadStatus, err := strconv.ParseUint(p.PayloadStatus, 10, 8)
+	if err != nil {
+		return nil, server.NewDecodeError(err, "PayloadStatus")
+	}
+	return &eth.PayloadAttestationData{
+		BeaconBlockRoot: beaconBlockRoot,
+		Slot:            primitives.Slot(slot),
+		PayloadStatus:   bytesutil.Bytes1(payloadStatus),
+	}, nil
+}
+
+func (p *SignedExecutionPayloadHeader) ToConsensus() (*enginev1.SignedExecutionPayloadHeader, error) {
+	if p == nil {
+		return nil, errNilValue
+	}
+	sig, err := bytesutil.DecodeHexWithLength(p.Signature, fieldparams.BLSSignatureLength)
+	if err != nil {
+		return nil, server.NewDecodeError(err, "Signature")
+	}
+	header, err := p.Message.ToConsensus()
+	if err != nil {
+		return nil, server.NewDecodeError(err, "Header")
+	}
+	return &enginev1.SignedExecutionPayloadHeader{
+		Message:   header,
+		Signature: sig,
+	}, nil
+}
+
+func (p *ExecutionPayloadHeaderEPBS) ToConsensus() (*enginev1.ExecutionPayloadHeaderEPBS, error) {
+	parentBlockHash, err := bytesutil.DecodeHexWithLength(p.ParentBlockHash, common.HashLength)
+	if err != nil {
+		return nil, server.NewDecodeError(err, "ParentBlockHash")
+	}
+	parentBlockRoot, err := bytesutil.DecodeHexWithLength(p.ParentBlockRoot, common.HashLength)
+	if err != nil {
+		return nil, server.NewDecodeError(err, "ParentBlockRoot")
+	}
+	blockHash, err := bytesutil.DecodeHexWithLength(p.BlockHash, common.HashLength)
+	if err != nil {
+		return nil, server.NewDecodeError(err, "BlockHash")
+	}
+	gasLimit, err := strconv.ParseUint(p.GasLimit, 10, 64)
+	if err != nil {
+		return nil, server.NewDecodeError(err, "GasLimit")
+	}
+	builderIndex, err := strconv.ParseUint(p.BuilderIndex, 10, 64)
+	if err != nil {
+		return nil, server.NewDecodeError(err, "BuilderIndex")
+	}
+	slot, err := strconv.ParseUint(p.Slot, 10, 64)
+	if err != nil {
+		return nil, server.NewDecodeError(err, "Slot")
+	}
+	value, err := strconv.ParseUint(p.Value, 10, 64)
+	if err != nil {
+		return nil, server.NewDecodeError(err, "Value")
+	}
+	blobKzgCommitmentsRoot, err := bytesutil.DecodeHexWithLength(p.BlobKzgCommitmentsRoot, fieldparams.RootLength)
+	if err != nil {
+		return nil, server.NewDecodeError(err, "BlobKzgCommitmentsRoot")
+	}
+	return &enginev1.ExecutionPayloadHeaderEPBS{
+		ParentBlockHash:        parentBlockHash,
+		ParentBlockRoot:        parentBlockRoot,
+		BlockHash:              blockHash,
+		GasLimit:               gasLimit,
+		BuilderIndex:           primitives.ValidatorIndex(builderIndex),
+		Slot:                   primitives.Slot(slot),
+		Value:                  value,
+		BlobKzgCommitmentsRoot: blobKzgCommitmentsRoot,
+	}, nil
+}
+
+func (b *SignedBeaconBlockEpbs) ToConsensus() (*eth.SignedBeaconBlockEpbs, error) {
+	if b == nil {
+		return nil, errNilValue
+	}
+
+	sig, err := bytesutil.DecodeHexWithLength(b.Signature, fieldparams.BLSSignatureLength)
+	if err != nil {
+		return nil, server.NewDecodeError(err, "Signature")
+	}
+	block, err := b.Message.ToConsensus()
+	if err != nil {
+		return nil, server.NewDecodeError(err, "Message")
+	}
+	return &eth.SignedBeaconBlockEpbs{
+		Block:     block,
+		Signature: sig,
+	}, nil
+}
+
+func BeaconBlockEpbsFromConsensus(b *eth.BeaconBlockEpbs) (*BeaconBlockEpbs, error) {
+	signedPayloadHeader, err := SignedExecutionPayloadHeaderFromConsensus(b.Body.SignedExecutionPayloadHeader)
+	if err != nil {
+		return nil, err
+	}
+	payloadAttestations, err := PayloadAttestationsFromConsensus(b.Body.PayloadAttestations)
+	if err != nil {
+		return nil, err
+	}
+	return &BeaconBlockEpbs{
+		Slot:          fmt.Sprintf("%d", b.Slot),
+		ProposerIndex: fmt.Sprintf("%d", b.ProposerIndex),
+		ParentRoot:    hexutil.Encode(b.ParentRoot),
+		StateRoot:     hexutil.Encode(b.StateRoot),
+		Body: &BeaconBlockBodyEpbs{
+			RandaoReveal:      hexutil.Encode(b.Body.RandaoReveal),
+			Eth1Data:          Eth1DataFromConsensus(b.Body.Eth1Data),
+			Graffiti:          hexutil.Encode(b.Body.Graffiti),
+			ProposerSlashings: ProposerSlashingsFromConsensus(b.Body.ProposerSlashings),
+			AttesterSlashings: AttesterSlashingsElectraFromConsensus(b.Body.AttesterSlashings),
+			Attestations:      AttsElectraFromConsensus(b.Body.Attestations),
+			Deposits:          DepositsFromConsensus(b.Body.Deposits),
+			VoluntaryExits:    SignedExitsFromConsensus(b.Body.VoluntaryExits),
+			SyncAggregate: &SyncAggregate{
+				SyncCommitteeBits:      hexutil.Encode(b.Body.SyncAggregate.SyncCommitteeBits),
+				SyncCommitteeSignature: hexutil.Encode(b.Body.SyncAggregate.SyncCommitteeSignature),
+			},
+			BLSToExecutionChanges:        SignedBLSChangesFromConsensus(b.Body.BlsToExecutionChanges),
+			SignedExecutionPayloadHeader: signedPayloadHeader,
+			PayloadAttestations:          payloadAttestations,
+		},
+	}, nil
+}
+
+func SignedExecutionPayloadEnvelopeFromConsensus(b *enginev1.SignedExecutionPayloadEnvelope) (*SignedExecutionPayloadEnvelope, error) {
+	payload, err := ExecutionPayloadEnvelopeFromConsensus(b.Message)
+	if err != nil {
+		return nil, err
+	}
+	return &SignedExecutionPayloadEnvelope{
+		Message:   payload,
+		Signature: hexutil.Encode(b.Signature),
+	}, nil
+}
+
+func ExecutionPayloadEnvelopeFromConsensus(b *enginev1.ExecutionPayloadEnvelope) (*ExecutionPayloadEnvelope, error) {
+	payload, err := ExecutionPayloadDenebFromConsensus(b.Payload)
+	if err != nil {
+		return nil, err
+	}
+	committments := make([]string, len(b.BlobKzgCommitments))
+	for i, c := range b.BlobKzgCommitments {
+		committments[i] = hexutil.Encode(c)
+	}
+
+	executionRequests := ExecutionRequestsFromConsensus(b.ExecutionRequests)
+	return &ExecutionPayloadEnvelope{
+		Payload:            payload,
+		ExecutionRequests:  executionRequests,
+		BuilderIndex:       fmt.Sprintf("%d", b.BuilderIndex),
+		BeaconBlockRoot:    hexutil.Encode(b.BeaconBlockRoot),
+		Slot:               fmt.Sprintf("%d", b.Slot),
+		BlobKzgCommitments: committments,
+		StateRoot:          hexutil.Encode(b.BeaconStateRoot),
+	}, nil
+}
+
+func SignedBeaconBlockEpbsFromConsensus(b *eth.SignedBeaconBlockEpbs) (*SignedBeaconBlockEpbs, error) {
+	block, err := BeaconBlockEpbsFromConsensus(b.Block)
+	if err != nil {
+		return nil, err
+	}
+	return &SignedBeaconBlockEpbs{
+		Message:   block,
+		Signature: hexutil.Encode(b.Signature),
+	}, nil
+}
+
+func SignedExecutionPayloadHeaderFromConsensus(b *enginev1.SignedExecutionPayloadHeader) (*SignedExecutionPayloadHeader, error) {
+	header, err := ExecutionPayloadHeaderEPBSFromConsensus(b.Message)
+	if err != nil {
+		return nil, err
+	}
+	return &SignedExecutionPayloadHeader{
+		Message:   header,
+		Signature: hexutil.Encode(b.Signature),
+	}, nil
+}
+
+func ExecutionPayloadHeaderEPBSFromConsensus(b *enginev1.ExecutionPayloadHeaderEPBS) (*ExecutionPayloadHeaderEPBS, error) {
+	return &ExecutionPayloadHeaderEPBS{
+		ParentBlockHash:        hexutil.Encode(b.ParentBlockHash),
+		ParentBlockRoot:        hexutil.Encode(b.ParentBlockRoot),
+		BlockHash:              hexutil.Encode(b.BlockHash),
+		GasLimit:               fmt.Sprintf("%d", b.GasLimit),
+		BuilderIndex:           fmt.Sprintf("%d", b.BuilderIndex),
+		Slot:                   fmt.Sprintf("%d", b.Slot),
+		Value:                  fmt.Sprintf("%d", b.Value),
+		BlobKzgCommitmentsRoot: hexutil.Encode(b.BlobKzgCommitmentsRoot),
+	}, nil
+}
+
+func PayloadAttestationsFromConsensus(b []*eth.PayloadAttestation) ([]*PayloadAttestation, error) {
+	payloadAttestations := make([]*PayloadAttestation, len(b))
+	for i, p := range b {
+		data, err := PayloadAttestationDataFromConsensus(p.Data)
+		if err != nil {
+			return nil, err
+		}
+		payloadAttestations[i] = &PayloadAttestation{
+			AggregationBits: hexutil.Encode(p.AggregationBits),
+			Data:            data,
+			Signature:       hexutil.Encode(p.Signature),
+		}
+	}
+	return payloadAttestations, nil
+}
+
+func PayloadAttestationDataFromConsensus(b *eth.PayloadAttestationData) (*PayloadAttestationData, error) {
+	return &PayloadAttestationData{
+		BeaconBlockRoot: hexutil.Encode(b.BeaconBlockRoot),
+		Slot:            fmt.Sprintf("%d", b.Slot),
+		PayloadStatus:   fmt.Sprintf("%d", b.PayloadStatus),
+	}, nil
+}

api/server/structs/endpoints_events.go

@@ -32,6 +32,13 @@ type DataColumnGossipEvent struct {
 	KzgCommitments []string `json:"kzg_commitments"`
 }
 
+type PayloadEvent struct {
+	Slot                string `json:"slot"`
+	BlockRoot           string `json:"block_root"`
+	ExecutionBlockHash  string `json:"execution_block_hash"`
+	ExecutionOptimistic bool   `json:"execution_optimistic"`
+}
+
 type AggregatedAttEventSource struct {
 	Aggregate *Attestation `json:"aggregate"`
 }

api/server/structs/state_epbs.go

@@ -0,0 +1,44 @@
+package structs
+
+type BeaconStateEPBS struct {
+	GenesisTime                   string                      `json:"genesis_time"`
+	GenesisValidatorsRoot         string                      `json:"genesis_validators_root"`
+	Slot                          string                      `json:"slot"`
+	Fork                          *Fork                       `json:"fork"`
+	LatestBlockHeader             *BeaconBlockHeader          `json:"latest_block_header"`
+	BlockRoots                    []string                    `json:"block_roots"`
+	StateRoots                    []string                    `json:"state_roots"`
+	HistoricalRoots               []string                    `json:"historical_roots"`
+	Eth1Data                      *Eth1Data                   `json:"eth1_data"`
+	Eth1DataVotes                 []*Eth1Data                 `json:"eth1_data_votes"`
+	Eth1DepositIndex              string                      `json:"eth1_deposit_index"`
+	Validators                    []*Validator                `json:"validators"`
+	Balances                      []string                    `json:"balances"`
+	RandaoMixes                   []string                    `json:"randao_mixes"`
+	Slashings                     []string                    `json:"slashings"`
+	PreviousEpochParticipation    []string                    `json:"previous_epoch_participation"`
+	CurrentEpochParticipation     []string                    `json:"current_epoch_participation"`
+	JustificationBits             string                      `json:"justification_bits"`
+	PreviousJustifiedCheckpoint   *Checkpoint                 `json:"previous_justified_checkpoint"`
+	CurrentJustifiedCheckpoint    *Checkpoint                 `json:"current_justified_checkpoint"`
+	FinalizedCheckpoint           *Checkpoint                 `json:"finalized_checkpoint"`
+	InactivityScores              []string                    `json:"inactivity_scores"`
+	CurrentSyncCommittee          *SyncCommittee              `json:"current_sync_committee"`
+	NextSyncCommittee             *SyncCommittee              `json:"next_sync_committee"`
+	LatestExecutionPayloadHeader  *ExecutionPayloadHeaderEPBS `json:"latest_execution_payload_header"`
+	NextWithdrawalIndex           string                      `json:"next_withdrawal_index"`
+	NextWithdrawalValidatorIndex  string                      `json:"next_withdrawal_validator_index"`
+	HistoricalSummaries           []*HistoricalSummary        `json:"historical_summaries"`
+	DepositRequestsStartIndex     string                      `json:"deposit_requests_start_index"`
+	DepositBalanceToConsume       string                      `json:"deposit_balance_to_consume"`
+	ExitBalanceToConsume          string                      `json:"exit_balance_to_consume"`
+	EarliestExitEpoch             string                      `json:"earliest_exit_epoch"`
+	ConsolidationBalanceToConsume string                      `json:"consolidation_balance_to_consume"`
+	EarliestConsolidationEpoch    string                      `json:"earliest_consolidation_epoch"`
+	PendingDeposits               []*PendingDeposit           `json:"pending_deposits"`
+	PendingPartialWithdrawals     []*PendingPartialWithdrawal `json:"pending_partial_withdrawals"`
+	PendingConsolidations         []*PendingConsolidation     `json:"pending_consolidations"`
+	LatestBlockHash               string                      `json:"latest_block_hash"`
+	LatestFullSlot                string                      `json:"latest_full_slot"`
+	LatestWithdrawalsRoot         string                      `json:"latest_withdrawals_root"`
+}

beacon-chain/blockchain/BUILD.bazel

@@ -6,9 +6,11 @@ go_library(
         "chain_info.go",
         "chain_info_forkchoice.go",
         "currently_syncing_block.go",
+        "currently_syncing_execution_payload_envelope.go",
         "defragment.go",
         "error.go",
         "execution_engine.go",
+        "execution_engine_epbs.go",
         "forkchoice_update_execution.go",
         "head.go",
         "head_sync_committee_info.go",
@@ -26,6 +28,8 @@ go_library(
         "receive_blob.go",
         "receive_block.go",
         "receive_data_column.go",
+        "receive_execution_payload_envelope.go",
+        "receive_payload_attestation_message.go",
         "service.go",
         "setup_forchoice.go",
         "tracked_proposer.go",
@@ -46,6 +50,7 @@ go_library(
         "//beacon-chain/core/altair:go_default_library",
         "//beacon-chain/core/blocks:go_default_library",
         "//beacon-chain/core/electra:go_default_library",
+        "//beacon-chain/core/epbs:go_default_library",
         "//beacon-chain/core/epoch/precompute:go_default_library",
         "//beacon-chain/core/feed:go_default_library",
         "//beacon-chain/core/feed/state:go_default_library",
@@ -102,6 +107,7 @@ go_library(
         "@com_github_prometheus_client_golang//prometheus/promauto:go_default_library",
         "@com_github_prysmaticlabs_go_bitfield//:go_default_library",
         "@com_github_sirupsen_logrus//:go_default_library",
+        "@io_opencensus_go//trace:go_default_library",
         "@org_golang_x_sync//errgroup:go_default_library",
     ],
 )
@@ -114,6 +120,7 @@ go_test(
         "chain_info_norace_test.go",
         "chain_info_test.go",
         "checktags_test.go",
+        "epbs_test.go",
         "error_test.go",
         "execution_engine_test.go",
         "forkchoice_update_execution_test.go",
@@ -129,6 +136,7 @@ go_test(
         "process_block_test.go",
         "receive_attestation_test.go",
         "receive_block_test.go",
+        "receive_execution_payload_envelope_test.go",
         "service_norace_test.go",
         "service_test.go",
         "setup_forkchoice_test.go",
@@ -188,6 +196,7 @@ go_test(
         "//testing/assert:go_default_library",
         "//testing/require:go_default_library",
         "//testing/util:go_default_library",
+        "//testing/util/random:go_default_library",
         "//time:go_default_library",
         "//time/slots:go_default_library",
         "@com_github_ethereum_go_ethereum//common:go_default_library",

beacon-chain/blockchain/chain_info.go

@@ -43,7 +43,7 @@ type ForkchoiceFetcher interface {
 	GetProposerHead() [32]byte
 	SetForkChoiceGenesisTime(time.Time)
 	UpdateHead(context.Context, primitives.Slot)
-	HighestReceivedBlockSlot() primitives.Slot
+	HighestReceivedBlockSlotRoot() (primitives.Slot, [32]byte)
 	ReceivedBlocksLastEpoch() (uint64, error)
 	InsertNode(context.Context, state.BeaconState, consensus_blocks.ROBlock) error
 	ForkChoiceDump(context.Context) (*forkchoice.Dump, error)
@@ -52,6 +52,8 @@ type ForkchoiceFetcher interface {
 	RecentBlockSlot(root [32]byte) (primitives.Slot, error)
 	IsCanonical(ctx context.Context, blockRoot [32]byte) (bool, error)
 	DependentRoot(primitives.Epoch) ([32]byte, error)
+	GetPTCVote(root [32]byte) primitives.PTCStatus
+	HashForBlockRoot(context.Context, [32]byte) ([]byte, error)
 }
 
 // TimeFetcher retrieves the Ethereum consensus data that's related to time.
@@ -120,6 +122,12 @@ type OptimisticModeFetcher interface {
 	IsOptimisticForRoot(ctx context.Context, root [32]byte) (bool, error)
 }
 
+// ExecutionPayloadFetcher defines a common interface that returns forkchoice
+// information about payload block hashes
+type ExecutionPayloadFetcher interface {
+	HashInForkchoice([32]byte) bool
+}
+
 // FinalizedCheckpt returns the latest finalized checkpoint from chain store.
 func (s *Service) FinalizedCheckpt() *ethpb.Checkpoint {
 	s.cfg.ForkChoiceStore.RLock()
@@ -401,6 +409,14 @@ func (s *Service) InForkchoice(root [32]byte) bool {
 	return s.cfg.ForkChoiceStore.HasNode(root)
 }
 
+// HashInForkchoice returns true if the given payload block hash is found in
+// forkchoice
+func (s *Service) HashInForkchoice(hash [32]byte) bool {
+	s.cfg.ForkChoiceStore.RLock()
+	defer s.cfg.ForkChoiceStore.RUnlock()
+	return s.cfg.ForkChoiceStore.HasHash(hash)
+}
+
 // IsOptimisticForRoot takes the root as argument instead of the current head
 // and returns true if it is optimistic.
 func (s *Service) IsOptimisticForRoot(ctx context.Context, root [32]byte) (bool, error) {
@@ -537,6 +553,12 @@ func (s *Service) BlockBeingSynced(root [32]byte) bool {
 	return s.blockBeingSynced.isSyncing(root)
 }
 
+// PayloadBeingSynced returns whether the block with the given root is currently being synced
+func (s *Service) PayloadBeingSynced(root [32]byte) bool {
+	_, syncing := s.payloadBeingSynced.isSyncing(root)
+	return syncing
+}
+
 // RecentBlockSlot returns block slot form fork choice store
 func (s *Service) RecentBlockSlot(root [32]byte) (primitives.Slot, error) {
 	s.cfg.ForkChoiceStore.RLock()

beacon-chain/blockchain/chain_info_forkchoice.go

@@ -7,6 +7,7 @@ import (
 	"github.com/OffchainLabs/prysm/v6/beacon-chain/state"
 	consensus_blocks "github.com/OffchainLabs/prysm/v6/consensus-types/blocks"
 	"github.com/OffchainLabs/prysm/v6/consensus-types/forkchoice"
+	"github.com/OffchainLabs/prysm/v6/consensus-types/interfaces"
 	"github.com/OffchainLabs/prysm/v6/consensus-types/primitives"
 	"github.com/OffchainLabs/prysm/v6/encoding/bytesutil"
 	"github.com/OffchainLabs/prysm/v6/runtime/version"
@@ -34,11 +35,11 @@ func (s *Service) SetForkChoiceGenesisTime(timestamp time.Time) {
 	s.cfg.ForkChoiceStore.SetGenesisTime(timestamp)
 }
 
-// HighestReceivedBlockSlot returns the corresponding value from forkchoice
-func (s *Service) HighestReceivedBlockSlot() primitives.Slot {
+// HighestReceivedBlockSlotRoot returns the corresponding value from forkchoice
+func (s *Service) HighestReceivedBlockSlotRoot() (primitives.Slot, [32]byte) {
 	s.cfg.ForkChoiceStore.RLock()
 	defer s.cfg.ForkChoiceStore.RUnlock()
-	return s.cfg.ForkChoiceStore.HighestReceivedBlockSlot()
+	return s.cfg.ForkChoiceStore.HighestReceivedBlockSlotRoot()
 }
 
 // ReceivedBlocksLastEpoch returns the corresponding value from forkchoice
@@ -121,6 +122,13 @@ func (s *Service) hashForGenesisBlock(ctx context.Context, root [32]byte) ([]byt
 	if st.Version() < version.Bellatrix {
 		return nil, nil
 	}
+	if st.Version() >= version.EPBS {
+		header, err := st.LatestExecutionPayloadHeaderEPBS()
+		if err != nil {
+			return nil, errors.Wrap(err, "could not get latest execution payload header")
+		}
+		return bytesutil.SafeCopyBytes(header.BlockHash), nil
+	}
 	header, err := st.LatestExecutionPayloadHeader()
 	if err != nil {
 		return nil, errors.Wrap(err, "could not get latest execution payload header")
@@ -134,3 +142,65 @@ func (s *Service) DependentRoot(epoch primitives.Epoch) ([32]byte, error) {
 	defer s.cfg.ForkChoiceStore.RUnlock()
 	return s.cfg.ForkChoiceStore.DependentRoot(epoch)
 }
+
+// HashForBlockRoot wraps a call to the corresponding method in forkchoice. If the hash is older it will grab it from DB
+func (s *Service) HashForBlockRoot(ctx context.Context, root [32]byte) ([]byte, error) {
+	s.cfg.ForkChoiceStore.RLock()
+	defer s.cfg.ForkChoiceStore.RUnlock()
+	hash := s.cfg.ForkChoiceStore.HashForBlockRoot(root)
+	if hash != [32]byte{} {
+		return hash[:], nil
+	}
+	blk, err := s.cfg.BeaconDB.Block(ctx, root)
+	if err != nil {
+		return nil, errors.Wrap(err, "failed to get block from DB and forkchoice")
+	}
+	// check for genesis block hash
+	genHash, err := s.hashForGenesisBlock(ctx, root)
+	if err == nil {
+		return genHash, nil
+	}
+	if !errors.Is(err, errNotGenesisRoot) {
+		return nil, errors.Wrap(err, "failed to get genesis block hash")
+	}
+	if blk.Version() < version.EPBS {
+		return nil, errors.New("block version is too old")
+	}
+	sh, err := blk.Block().Body().SignedExecutionPayloadHeader()
+	if err != nil {
+		return nil, errors.Wrap(err, "failed to get signed execution payload header")
+	}
+	h, err := sh.Header()
+	if err != nil {
+		return nil, errors.Wrap(err, "failed to get execution payload header")
+	}
+	hash = h.BlockHash()
+	return hash[:], nil
+}
+
+// GetPTCVote wraps a call to the corresponding method in forkchoice and checks
+// the currently syncing status
+// Warning: this method will return the current PTC status regardless of
+// timeliness. A client MUST call this method when about to submit a PTC
+// attestation, that is exactly at the threshold to submit the attestation.
+func (s *Service) GetPTCVote(root [32]byte) primitives.PTCStatus {
+	s.cfg.ForkChoiceStore.RLock()
+	f := s.cfg.ForkChoiceStore.GetPTCVote()
+	s.cfg.ForkChoiceStore.RUnlock()
+	if f != primitives.PAYLOAD_ABSENT {
+		return f
+	}
+	f, isSyncing := s.payloadBeingSynced.isSyncing(root)
+	if isSyncing {
+		return f
+	}
+	return primitives.PAYLOAD_ABSENT
+}
+
+// insertPayloadEnvelope wraps a locked call to the corresponding method in
+// forkchoice
+func (s *Service) insertPayloadEnvelope(envelope interfaces.ROExecutionPayloadEnvelope) error {
+	s.cfg.ForkChoiceStore.Lock()
+	defer s.cfg.ForkChoiceStore.Unlock()
+	return s.cfg.ForkChoiceStore.InsertPayloadEnvelope(envelope)
+}

beacon-chain/blockchain/currently_syncing_execution_payload_envelope.go

@@ -0,0 +1,32 @@
+package blockchain
+
+import (
+	"sync"
+
+	"github.com/OffchainLabs/prysm/v6/consensus-types/interfaces"
+	"github.com/OffchainLabs/prysm/v6/consensus-types/primitives"
+)
+
+type currentlySyncingPayload struct {
+	sync.Mutex
+	roots map[[32]byte]primitives.PTCStatus
+}
+
+func (b *currentlySyncingPayload) set(envelope interfaces.ROExecutionPayloadEnvelope) {
+	b.Lock()
+	defer b.Unlock()
+	b.roots[envelope.BeaconBlockRoot()] = primitives.PAYLOAD_PRESENT
+}
+
+func (b *currentlySyncingPayload) unset(root [32]byte) {
+	b.Lock()
+	defer b.Unlock()
+	delete(b.roots, root)
+}
+
+func (b *currentlySyncingPayload) isSyncing(root [32]byte) (status primitives.PTCStatus, isSyncing bool) {
+	b.Lock()
+	defer b.Unlock()
+	status, isSyncing = b.roots[root]
+	return
+}

beacon-chain/blockchain/epbs_test.go

@@ -0,0 +1,18 @@
+package blockchain
+
+import (
+	"testing"
+
+	doublylinkedtree "github.com/OffchainLabs/prysm/v6/beacon-chain/forkchoice/doubly-linked-tree"
+	"github.com/OffchainLabs/prysm/v6/consensus-types/primitives"
+	"github.com/OffchainLabs/prysm/v6/testing/require"
+)
+
+func TestServiceGetPTCVote(t *testing.T) {
+	c := &currentlySyncingPayload{roots: make(map[[32]byte]primitives.PTCStatus)}
+	s := &Service{cfg: &config{ForkChoiceStore: doublylinkedtree.New()}, payloadBeingSynced: c}
+	r := [32]byte{'r'}
+	require.Equal(t, primitives.PAYLOAD_ABSENT, s.GetPTCVote(r))
+	c.roots[r] = primitives.PAYLOAD_WITHHELD
+	require.Equal(t, primitives.PAYLOAD_WITHHELD, s.GetPTCVote(r))
+}

beacon-chain/blockchain/error.go

@@ -36,14 +36,17 @@ var (
 	ErrNotCheckpoint = errors.New("not a checkpoint in forkchoice")
 	// ErrNilHead is returned when no head is present in the blockchain service.
 	ErrNilHead = errors.New("nil head")
-	// errNotGenesisRoot is returned when the root is not the genesis block root.
-	errNotGenesisRoot = errors.New("root is not the genesis block root")
 	// errBlacklistedBlock is returned when a block is blacklisted as invalid.
 	errBlacklistedRoot = verification.AsVerificationFailure(errors.New("block root is blacklisted"))
 	// errMaxBlobsExceeded is returned when the number of blobs in a block exceeds the maximum allowed.
 	errMaxBlobsExceeded = verification.AsVerificationFailure(errors.New("expected commitments in block exceeds MAX_BLOBS_PER_BLOCK"))
 	// errMaxDataColumnsExceeded is returned when the number of data columns exceeds the maximum allowed.
 	errMaxDataColumnsExceeded = verification.AsVerificationFailure(errors.New("expected data columns for node exceeds NUMBER_OF_COLUMNS"))
+	// errInvalidValidatorIndex is returned when a validator index is
+	// invalid or unexpected
+	errInvalidValidatorIndex = errors.New("invalid validator index")
+	// errNotGenesisRoot is returned when the root is not the genesis block root.
+	errNotGenesisRoot = errors.New("root is not the genesis block root")
 )
 
 // An invalid block is the block that fails state transition based on the core protocol rules.

beacon-chain/blockchain/execution_engine.go

@@ -2,6 +2,7 @@ package blockchain
 
 import (
 	"context"
+	"crypto/sha256"
 	"fmt"
 
 	"github.com/OffchainLabs/prysm/v6/async/event"
@@ -30,6 +31,8 @@ import (
 	"github.com/sirupsen/logrus"
 )
 
+const blobCommitmentVersionKZG uint8 = 0x01
+
 var defaultLatestValidHash = bytesutil.PadTo([]byte{0xff}, 32)
 
 // notifyForkchoiceUpdate signals execution engine the fork choice updates. Execution engine should:
@@ -106,6 +109,14 @@ func (s *Service) notifyForkchoiceUpdate(ctx context.Context, arg *fcuConfig) (*
 				log.WithError(err).Error("Could not set head root to invalid")
 				return nil, nil
 			}
+			if len(invalidRoots) == 0 {
+				log.WithFields(logrus.Fields{
+					"slot":      headBlk.Slot(),
+					"blockRoot": fmt.Sprintf("%#x", bytesutil.Trunc(headRoot[:])),
+				}).Warn("Invalid payload")
+				return nil, nil
+			}
+
 			if err := s.removeInvalidBlockAndState(ctx, invalidRoots); err != nil {
 				log.WithError(err).Error("Could not remove invalid block and state")
 				return nil, nil
@@ -120,6 +131,7 @@ func (s *Service) notifyForkchoiceUpdate(ctx context.Context, arg *fcuConfig) (*
 				}).Warn("Pruned invalid blocks, could not update head root")
 				return nil, invalidBlock{error: ErrInvalidPayload, root: arg.headRoot, invalidAncestorRoots: invalidRoots}
 			}
+
 			b, err := s.getBlock(ctx, r)
 			if err != nil {
 				log.WithError(err).Error("Could not get head block")
@@ -454,7 +466,13 @@ func kzgCommitmentsToVersionedHashes(body interfaces.ReadOnlyBeaconBlockBody) ([
 
 	versionedHashes := make([]common.Hash, len(commitments))
 	for i, commitment := range commitments {
-		versionedHashes[i] = primitives.ConvertKzgCommitmentToVersionedHash(commitment)
+		versionedHashes[i] = ConvertKzgCommitmentToVersionedHash(commitment)
 	}
 	return versionedHashes, nil
 }
+
+func ConvertKzgCommitmentToVersionedHash(commitment []byte) common.Hash {
+	versionedHash := sha256.Sum256(commitment)
+	versionedHash[0] = blobCommitmentVersionKZG
+	return versionedHash
+}

beacon-chain/blockchain/execution_engine_epbs.go

@@ -0,0 +1,62 @@
+package blockchain
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/OffchainLabs/prysm/v6/beacon-chain/execution"
+	"github.com/OffchainLabs/prysm/v6/config/features"
+	payloadattribute "github.com/OffchainLabs/prysm/v6/consensus-types/payload-attribute"
+	"github.com/OffchainLabs/prysm/v6/encoding/bytesutil"
+	"github.com/OffchainLabs/prysm/v6/monitoring/tracing/trace"
+	enginev1 "github.com/OffchainLabs/prysm/v6/proto/engine/v1"
+	"github.com/OffchainLabs/prysm/v6/runtime/version"
+	"github.com/pkg/errors"
+	"github.com/sirupsen/logrus"
+)
+
+// notifyForkchoiceUpdate signals execution engine the fork choice updates. Execution engine should:
+// 1. Re-organizes the execution payload chain and corresponding state to make head_block_hash the head.
+// 2. Applies finality to the execution state: it irreversibly persists the chain of all execution payloads and corresponding state, up to and including finalized_block_hash.
+func (s *Service) notifyForkchoiceUpdateEPBS(ctx context.Context, blockhash [32]byte, attributes payloadattribute.Attributer) (*enginev1.PayloadIDBytes, error) {
+	ctx, span := trace.StartSpan(ctx, "blockChain.notifyForkchoiceUpdateEPBS")
+	defer span.End()
+
+	finalizedHash := s.cfg.ForkChoiceStore.FinalizedPayloadBlockHash()
+	justifiedHash := s.cfg.ForkChoiceStore.UnrealizedJustifiedPayloadBlockHash()
+	fcs := &enginev1.ForkchoiceState{
+		HeadBlockHash:      blockhash[:],
+		SafeBlockHash:      justifiedHash[:],
+		FinalizedBlockHash: finalizedHash[:],
+	}
+	if attributes == nil {
+		attributes = payloadattribute.EmptyWithVersion(version.EPBS)
+	}
+	payloadID, lastValidHash, err := s.cfg.ExecutionEngineCaller.ForkchoiceUpdated(ctx, fcs, attributes)
+	if err != nil {
+		switch {
+		case errors.Is(err, execution.ErrAcceptedSyncingPayloadStatus):
+			forkchoiceUpdatedOptimisticNodeCount.Inc()
+			log.WithFields(logrus.Fields{
+				"headPayloadBlockHash":      fmt.Sprintf("%#x", bytesutil.Trunc(blockhash[:])),
+				"finalizedPayloadBlockHash": fmt.Sprintf("%#x", bytesutil.Trunc(finalizedHash[:])),
+			}).Info("Called fork choice updated with optimistic block")
+			return payloadID, nil
+		case errors.Is(err, execution.ErrInvalidPayloadStatus):
+			log.WithError(err).Info("Forkchoice updated to invalid block")
+			return nil, invalidBlock{error: ErrInvalidPayload, root: [32]byte(lastValidHash)}
+		default:
+			log.WithError(err).Error(ErrUndefinedExecutionEngineError)
+			return nil, nil
+		}
+	}
+	forkchoiceUpdatedValidNodeCount.Inc()
+	// If the forkchoice update call has an attribute, update the payload ID cache.
+	hasAttr := attributes != nil && !attributes.IsEmpty()
+	if hasAttr && payloadID == nil && !features.Get().PrepareAllPayloads {
+		log.WithFields(logrus.Fields{
+			"blockHash": fmt.Sprintf("%#x", blockhash[:]),
+		}).Error("Received nil payload ID on VALID engine response")
+	}
+	return payloadID, nil
+}

beacon-chain/blockchain/execution_engine_test.go

@@ -46,13 +46,13 @@ func Test_NotifyForkchoiceUpdate_GetPayloadAttrErrorCanContinue(t *testing.T) {
 
 	ojc := &ethpb.Checkpoint{Root: params.BeaconConfig().ZeroHash[:]}
 	ofc := &ethpb.Checkpoint{Root: params.BeaconConfig().ZeroHash[:]}
-	state, blkRoot, err := prepareForkchoiceState(ctx, 0, [32]byte{}, [32]byte{}, params.BeaconConfig().ZeroHash, ojc, ofc)
+	state, blkRoot, err := prepareForkchoiceState(ctx, 0, [32]byte{}, [32]byte{}, params.BeaconConfig().ZeroHash, [32]byte{}, ojc, ofc)
 	require.NoError(t, err)
 	require.NoError(t, fcs.InsertNode(ctx, state, blkRoot))
-	state, blkRoot, err = prepareForkchoiceState(ctx, 1, altairBlkRoot, [32]byte{}, params.BeaconConfig().ZeroHash, ojc, ofc)
+	state, blkRoot, err = prepareForkchoiceState(ctx, 1, altairBlkRoot, [32]byte{}, [32]byte{'A'}, [32]byte{}, ojc, ofc)
 	require.NoError(t, err)
 	require.NoError(t, fcs.InsertNode(ctx, state, blkRoot))
-	state, blkRoot, err = prepareForkchoiceState(ctx, 2, bellatrixBlkRoot, altairBlkRoot, params.BeaconConfig().ZeroHash, ojc, ofc)
+	state, blkRoot, err = prepareForkchoiceState(ctx, 2, bellatrixBlkRoot, altairBlkRoot, [32]byte{'B'}, [32]byte{'A'}, ojc, ofc)
 	require.NoError(t, err)
 	require.NoError(t, fcs.InsertNode(ctx, state, blkRoot))
 
@@ -104,13 +104,13 @@ func Test_NotifyForkchoiceUpdate(t *testing.T) {
 
 	ojc := &ethpb.Checkpoint{Root: params.BeaconConfig().ZeroHash[:]}
 	ofc := &ethpb.Checkpoint{Root: params.BeaconConfig().ZeroHash[:]}
-	state, blkRoot, err := prepareForkchoiceState(ctx, 0, [32]byte{}, [32]byte{}, params.BeaconConfig().ZeroHash, ojc, ofc)
+	state, blkRoot, err := prepareForkchoiceState(ctx, 0, [32]byte{}, [32]byte{}, params.BeaconConfig().ZeroHash, [32]byte{}, ojc, ofc)
 	require.NoError(t, err)
 	require.NoError(t, fcs.InsertNode(ctx, state, blkRoot))
-	state, blkRoot, err = prepareForkchoiceState(ctx, 1, altairBlkRoot, [32]byte{}, params.BeaconConfig().ZeroHash, ojc, ofc)
+	state, blkRoot, err = prepareForkchoiceState(ctx, 1, altairBlkRoot, [32]byte{}, [32]byte{'A'}, [32]byte{}, ojc, ofc)
 	require.NoError(t, err)
 	require.NoError(t, fcs.InsertNode(ctx, state, blkRoot))
-	state, blkRoot, err = prepareForkchoiceState(ctx, 2, bellatrixBlkRoot, altairBlkRoot, params.BeaconConfig().ZeroHash, ojc, ofc)
+	state, blkRoot, err = prepareForkchoiceState(ctx, 2, bellatrixBlkRoot, altairBlkRoot, [32]byte{'B'}, [32]byte{'A'}, ojc, ofc)
 	require.NoError(t, err)
 	require.NoError(t, fcs.InsertNode(ctx, state, blkRoot))
 	badHash := [32]byte{'h'}
@@ -288,16 +288,16 @@ func Test_NotifyForkchoiceUpdate_NIlLVH(t *testing.T) {
 	require.NoError(t, fcs.UpdateJustifiedCheckpoint(ctx, &forkchoicetypes.Checkpoint{}))
 	ojc := &ethpb.Checkpoint{Root: params.BeaconConfig().ZeroHash[:]}
 	ofc := &ethpb.Checkpoint{Root: params.BeaconConfig().ZeroHash[:]}
-	state, blkRoot, err := prepareForkchoiceState(ctx, 1, bra, [32]byte{}, [32]byte{'A'}, ojc, ofc)
+	state, blkRoot, err := prepareForkchoiceState(ctx, 1, bra, [32]byte{}, [32]byte{'A'}, [32]byte{}, ojc, ofc)
 	require.NoError(t, err)
 	require.NoError(t, fcs.InsertNode(ctx, state, blkRoot))
-	state, blkRoot, err = prepareForkchoiceState(ctx, 2, brb, bra, [32]byte{'B'}, ojc, ofc)
+	state, blkRoot, err = prepareForkchoiceState(ctx, 2, brb, bra, [32]byte{'B'}, [32]byte{'A'}, ojc, ofc)
 	require.NoError(t, err)
 	require.NoError(t, fcs.InsertNode(ctx, state, blkRoot))
-	state, blkRoot, err = prepareForkchoiceState(ctx, 3, brc, brb, [32]byte{'C'}, ojc, ofc)
+	state, blkRoot, err = prepareForkchoiceState(ctx, 3, brc, brb, [32]byte{'C'}, [32]byte{'B'}, ojc, ofc)
 	require.NoError(t, err)
 	require.NoError(t, fcs.InsertNode(ctx, state, blkRoot))
-	state, blkRoot, err = prepareForkchoiceState(ctx, 4, brd, brc, [32]byte{'D'}, ojc, ofc)
+	state, blkRoot, err = prepareForkchoiceState(ctx, 4, brd, brc, [32]byte{'D'}, [32]byte{'C'}, ojc, ofc)
 	require.NoError(t, err)
 	require.NoError(t, fcs.InsertNode(ctx, state, blkRoot))
 
@@ -317,10 +317,8 @@ func Test_NotifyForkchoiceUpdate_NIlLVH(t *testing.T) {
 		headRoot:  brd,
 	}
 	_, err = service.notifyForkchoiceUpdate(ctx, a)
-	require.Equal(t, true, IsInvalidBlock(err))
-	require.Equal(t, brd, InvalidBlockRoot(err))
-	require.Equal(t, brd, InvalidAncestorRoots(err)[0])
-	require.Equal(t, 1, len(InvalidAncestorRoots(err)))
+	// The incoming block is not invalid because the empty node is still valid on ePBS.
+	require.Equal(t, false, IsInvalidBlock(err))
 }
 
 //
@@ -399,28 +397,28 @@ func Test_NotifyForkchoiceUpdateRecursive_DoublyLinkedTree(t *testing.T) {
 	require.NoError(t, fcs.UpdateJustifiedCheckpoint(ctx, &forkchoicetypes.Checkpoint{}))
 	ojc := &ethpb.Checkpoint{Root: params.BeaconConfig().ZeroHash[:]}
 	ofc := &ethpb.Checkpoint{Root: params.BeaconConfig().ZeroHash[:]}
-	state, blkRoot, err := prepareForkchoiceState(ctx, 1, bra, [32]byte{}, [32]byte{'A'}, ojc, ofc)
+	state, blkRoot, err := prepareForkchoiceState(ctx, 1, bra, [32]byte{}, [32]byte{'A'}, [32]byte{}, ojc, ofc)
 	require.NoError(t, err)
 
 	bState, _ := util.DeterministicGenesisState(t, 10)
 	require.NoError(t, beaconDB.SaveState(ctx, bState, bra))
 	require.NoError(t, fcs.InsertNode(ctx, state, blkRoot))
-	state, blkRoot, err = prepareForkchoiceState(ctx, 2, brb, bra, [32]byte{'B'}, ojc, ofc)
+	state, blkRoot, err = prepareForkchoiceState(ctx, 2, brb, bra, [32]byte{'B'}, [32]byte{'A'}, ojc, ofc)
 	require.NoError(t, err)
 	require.NoError(t, fcs.InsertNode(ctx, state, blkRoot))
-	state, blkRoot, err = prepareForkchoiceState(ctx, 3, brc, brb, [32]byte{'C'}, ojc, ofc)
+	state, blkRoot, err = prepareForkchoiceState(ctx, 3, brc, brb, [32]byte{'C'}, [32]byte{'B'}, ojc, ofc)
 	require.NoError(t, err)
 	require.NoError(t, fcs.InsertNode(ctx, state, blkRoot))
-	state, blkRoot, err = prepareForkchoiceState(ctx, 4, brd, brc, [32]byte{'D'}, ojc, ofc)
+	state, blkRoot, err = prepareForkchoiceState(ctx, 4, brd, brc, [32]byte{'D'}, [32]byte{'C'}, ojc, ofc)
 	require.NoError(t, err)
 	require.NoError(t, fcs.InsertNode(ctx, state, blkRoot))
-	state, blkRoot, err = prepareForkchoiceState(ctx, 5, bre, brb, [32]byte{'E'}, ojc, ofc)
+	state, blkRoot, err = prepareForkchoiceState(ctx, 5, bre, brb, [32]byte{'E'}, [32]byte{'D'}, ojc, ofc)
 	require.NoError(t, err)
 	require.NoError(t, fcs.InsertNode(ctx, state, blkRoot))
-	state, blkRoot, err = prepareForkchoiceState(ctx, 6, brf, bre, [32]byte{'F'}, ojc, ofc)
+	state, blkRoot, err = prepareForkchoiceState(ctx, 6, brf, bre, [32]byte{'F'}, [32]byte{'E'}, ojc, ofc)
 	require.NoError(t, err)
 	require.NoError(t, fcs.InsertNode(ctx, state, blkRoot))
-	state, blkRoot, err = prepareForkchoiceState(ctx, 7, brg, bre, [32]byte{'G'}, ojc, ofc)
+	state, blkRoot, err = prepareForkchoiceState(ctx, 7, brg, bre, [32]byte{'G'}, [32]byte{'F'}, ojc, ofc)
 	require.NoError(t, err)
 	require.NoError(t, fcs.InsertNode(ctx, state, blkRoot))
 
@@ -513,10 +511,10 @@ func Test_NotifyNewPayload(t *testing.T) {
 	require.NoError(t, err)
 	ojc := &ethpb.Checkpoint{Root: params.BeaconConfig().ZeroHash[:]}
 	ofc := &ethpb.Checkpoint{Root: params.BeaconConfig().ZeroHash[:]}
-	state, blkRoot, err := prepareForkchoiceState(ctx, 0, [32]byte{}, [32]byte{}, params.BeaconConfig().ZeroHash, ojc, ofc)
+	state, blkRoot, err := prepareForkchoiceState(ctx, 0, [32]byte{}, [32]byte{}, params.BeaconConfig().ZeroHash, [32]byte{}, ojc, ofc)
 	require.NoError(t, err)
 	require.NoError(t, fcs.InsertNode(ctx, state, blkRoot))
-	state, blkRoot, err = prepareForkchoiceState(ctx, 1, r, [32]byte{}, params.BeaconConfig().ZeroHash, ojc, ofc)
+	state, blkRoot, err = prepareForkchoiceState(ctx, 1, r, [32]byte{}, [32]byte{'A'}, [32]byte{}, ojc, ofc)
 	require.NoError(t, err)
 	require.NoError(t, fcs.InsertNode(ctx, state, blkRoot))
 
@@ -693,7 +691,7 @@ func Test_NotifyNewPayload(t *testing.T) {
 			}
 			service.cfg.ExecutionEngineCaller = e
 			root := [32]byte{'a'}
-			state, blkRoot, err := prepareForkchoiceState(ctx, 0, root, [32]byte{}, params.BeaconConfig().ZeroHash, ojc, ofc)
+			state, blkRoot, err := prepareForkchoiceState(ctx, 0, root, [32]byte{}, params.BeaconConfig().ZeroHash, [32]byte{}, ojc, ofc)
 			require.NoError(t, err)
 			require.NoError(t, service.cfg.ForkChoiceStore.InsertNode(ctx, state, blkRoot))
 			postVersion, postHeader, err := getStateVersionAndPayload(tt.postState)
@@ -760,17 +758,17 @@ func Test_reportInvalidBlock(t *testing.T) {
 	service, tr := minimalTestService(t)
 	ctx, _, fcs := tr.ctx, tr.db, tr.fcs
 	jcp := &ethpb.Checkpoint{}
-	st, root, err := prepareForkchoiceState(ctx, 0, [32]byte{'A'}, [32]byte{}, [32]byte{'a'}, jcp, jcp)
+	st, root, err := prepareForkchoiceState(ctx, 0, [32]byte{'A'}, [32]byte{}, [32]byte{'a'}, [32]byte{}, jcp, jcp)
 	require.NoError(t, err)
 	require.NoError(t, fcs.InsertNode(ctx, st, root))
-	st, root, err = prepareForkchoiceState(ctx, 1, [32]byte{'B'}, [32]byte{'A'}, [32]byte{'b'}, jcp, jcp)
+	st, root, err = prepareForkchoiceState(ctx, 1, [32]byte{'B'}, [32]byte{'A'}, [32]byte{'b'}, [32]byte{'a'}, jcp, jcp)
 	require.NoError(t, err)
 	require.NoError(t, fcs.InsertNode(ctx, st, root))
-	st, root, err = prepareForkchoiceState(ctx, 2, [32]byte{'C'}, [32]byte{'B'}, [32]byte{'c'}, jcp, jcp)
+	st, root, err = prepareForkchoiceState(ctx, 2, [32]byte{'C'}, [32]byte{'B'}, [32]byte{'c'}, [32]byte{'b'}, jcp, jcp)
 	require.NoError(t, err)
 	require.NoError(t, fcs.InsertNode(ctx, st, root))
 
-	st, root, err = prepareForkchoiceState(ctx, 3, [32]byte{'D'}, [32]byte{'C'}, [32]byte{'d'}, jcp, jcp)
+	st, root, err = prepareForkchoiceState(ctx, 3, [32]byte{'D'}, [32]byte{'C'}, [32]byte{'d'}, [32]byte{'c'}, jcp, jcp)
 	require.NoError(t, err)
 	require.NoError(t, fcs.InsertNode(ctx, st, root))
 
@@ -932,7 +930,7 @@ func Test_UpdateLastValidatedCheckpoint(t *testing.T) {
 	fjc := &forkchoicetypes.Checkpoint{Epoch: 0, Root: params.BeaconConfig().ZeroHash}
 	require.NoError(t, fcs.UpdateJustifiedCheckpoint(ctx, fjc))
 	require.NoError(t, fcs.UpdateFinalizedCheckpoint(fjc))
-	state, blkRoot, err := prepareForkchoiceState(ctx, 0, genesisRoot, params.BeaconConfig().ZeroHash, params.BeaconConfig().ZeroHash, ojc, ofc)
+	state, blkRoot, err := prepareForkchoiceState(ctx, 0, genesisRoot, params.BeaconConfig().ZeroHash, params.BeaconConfig().ZeroHash, [32]byte{}, ojc, ofc)
 	require.NoError(t, err)
 	require.NoError(t, fcs.InsertNode(ctx, state, blkRoot))
 	fcs.SetOriginRoot(genesisRoot)
@@ -966,7 +964,7 @@ func Test_UpdateLastValidatedCheckpoint(t *testing.T) {
 	require.NoError(t, beaconDB.SaveStateSummary(ctx, opStateSummary))
 	tenjc := &ethpb.Checkpoint{Epoch: 10, Root: genesisRoot[:]}
 	tenfc := &ethpb.Checkpoint{Epoch: 10, Root: genesisRoot[:]}
-	state, blkRoot, err = prepareForkchoiceState(ctx, 320, opRoot, genesisRoot, params.BeaconConfig().ZeroHash, tenjc, tenfc)
+	state, blkRoot, err = prepareForkchoiceState(ctx, 320, opRoot, genesisRoot, params.BeaconConfig().ZeroHash, [32]byte{}, tenjc, tenfc)
 	require.NoError(t, err)
 	require.NoError(t, fcs.InsertNode(ctx, state, blkRoot))
 	assert.NoError(t, beaconDB.SaveGenesisBlockRoot(ctx, opRoot))
@@ -995,7 +993,7 @@ func Test_UpdateLastValidatedCheckpoint(t *testing.T) {
 	require.NoError(t, beaconDB.SaveStateSummary(ctx, validSummary))
 	twentyjc := &ethpb.Checkpoint{Epoch: 20, Root: validRoot[:]}
 	twentyfc := &ethpb.Checkpoint{Epoch: 20, Root: validRoot[:]}
-	state, blkRoot, err = prepareForkchoiceState(ctx, 640, validRoot, genesisRoot, params.BeaconConfig().ZeroHash, twentyjc, twentyfc)
+	state, blkRoot, err = prepareForkchoiceState(ctx, 640, validRoot, genesisRoot, params.BeaconConfig().ZeroHash, [32]byte{}, twentyjc, twentyfc)
 	require.NoError(t, err)
 	fcs.SetBalancesByRooter(func(_ context.Context, _ [32]byte) ([]uint64, error) { return []uint64{}, nil })
 	require.NoError(t, fcs.InsertNode(ctx, state, blkRoot))
@@ -1057,8 +1055,8 @@ func TestService_removeInvalidBlockAndState(t *testing.T) {
 
 	require.NoError(t, service.removeInvalidBlockAndState(ctx, [][32]byte{r1, r2}))
 
-	require.Equal(t, false, service.hasBlock(ctx, r1))
-	require.Equal(t, false, service.hasBlock(ctx, r2))
+	require.Equal(t, false, service.chainHasBlock(ctx, r1))
+	require.Equal(t, false, service.chainHasBlock(ctx, r2))
 	require.Equal(t, false, service.cfg.BeaconDB.HasStateSummary(ctx, r1))
 	require.Equal(t, false, service.cfg.BeaconDB.HasStateSummary(ctx, r2))
 	has, err := service.cfg.StateGen.HasState(ctx, r1)

beacon-chain/blockchain/forkchoice_update_execution_test.go

@@ -121,13 +121,13 @@ func TestService_forkchoiceUpdateWithExecution_SameHeadRootNewProposer(t *testin
 
 	ojc := &ethpb.Checkpoint{Root: params.BeaconConfig().ZeroHash[:]}
 	ofc := &ethpb.Checkpoint{Root: params.BeaconConfig().ZeroHash[:]}
-	state, blkRoot, err := prepareForkchoiceState(ctx, 0, [32]byte{}, [32]byte{}, params.BeaconConfig().ZeroHash, ojc, ofc)
+	state, blkRoot, err := prepareForkchoiceState(ctx, 0, [32]byte{}, [32]byte{}, params.BeaconConfig().ZeroHash, [32]byte{}, ojc, ofc)
 	require.NoError(t, err)
 	require.NoError(t, fcs.InsertNode(ctx, state, blkRoot))
-	state, blkRoot, err = prepareForkchoiceState(ctx, 1, altairBlkRoot, [32]byte{}, params.BeaconConfig().ZeroHash, ojc, ofc)
+	state, blkRoot, err = prepareForkchoiceState(ctx, 1, altairBlkRoot, [32]byte{}, params.BeaconConfig().ZeroHash, [32]byte{}, ojc, ofc)
 	require.NoError(t, err)
 	require.NoError(t, fcs.InsertNode(ctx, state, blkRoot))
-	state, blkRoot, err = prepareForkchoiceState(ctx, 2, bellatrixBlkRoot, altairBlkRoot, params.BeaconConfig().ZeroHash, ojc, ofc)
+	state, blkRoot, err = prepareForkchoiceState(ctx, 2, bellatrixBlkRoot, altairBlkRoot, params.BeaconConfig().ZeroHash, [32]byte{}, ojc, ofc)
 	require.NoError(t, err)
 	require.NoError(t, fcs.InsertNode(ctx, state, blkRoot))
 
@@ -164,10 +164,10 @@ func TestShouldOverrideFCU(t *testing.T) {
 	headRoot := [32]byte{'b'}
 	parentRoot := [32]byte{'a'}
 	ojc := &ethpb.Checkpoint{}
-	st, root, err := prepareForkchoiceState(ctx, 1, parentRoot, [32]byte{}, [32]byte{}, ojc, ojc)
+	st, root, err := prepareForkchoiceState(ctx, 1, parentRoot, [32]byte{}, [32]byte{}, [32]byte{}, ojc, ojc)
 	require.NoError(t, err)
 	require.NoError(t, fcs.InsertNode(ctx, st, root))
-	st, root, err = prepareForkchoiceState(ctx, 2, headRoot, parentRoot, [32]byte{}, ojc, ojc)
+	st, root, err = prepareForkchoiceState(ctx, 2, headRoot, parentRoot, [32]byte{}, [32]byte{}, ojc, ojc)
 	require.NoError(t, err)
 	require.NoError(t, fcs.InsertNode(ctx, st, root))
 

beacon-chain/blockchain/head_test.go

@@ -48,7 +48,7 @@ func TestSaveHead_Different(t *testing.T) {
 	require.NoError(t, err)
 	ojc := &ethpb.Checkpoint{Root: params.BeaconConfig().ZeroHash[:]}
 	ofc := &ethpb.Checkpoint{Root: params.BeaconConfig().ZeroHash[:]}
-	state, blkRoot, err := prepareForkchoiceState(ctx, oldBlock.Block().Slot(), oldRoot, oldBlock.Block().ParentRoot(), [32]byte{}, ojc, ofc)
+	state, blkRoot, err := prepareForkchoiceState(ctx, oldBlock.Block().Slot(), oldRoot, oldBlock.Block().ParentRoot(), [32]byte{}, [32]byte{}, ojc, ofc)
 	require.NoError(t, err)
 	require.NoError(t, service.cfg.ForkChoiceStore.InsertNode(ctx, state, blkRoot))
 	service.head = &head{
@@ -63,11 +63,11 @@ func TestSaveHead_Different(t *testing.T) {
 	wsb := util.SaveBlock(t, t.Context(), service.cfg.BeaconDB, newHeadSignedBlock)
 	newRoot, err := newHeadBlock.HashTreeRoot()
 	require.NoError(t, err)
-	state, blkRoot, err = prepareForkchoiceState(ctx, slots.PrevSlot(wsb.Block().Slot()), wsb.Block().ParentRoot(), service.cfg.ForkChoiceStore.CachedHeadRoot(), [32]byte{}, ojc, ofc)
+	state, blkRoot, err = prepareForkchoiceState(ctx, slots.PrevSlot(wsb.Block().Slot()), wsb.Block().ParentRoot(), service.cfg.ForkChoiceStore.CachedHeadRoot(), [32]byte{}, [32]byte{}, ojc, ofc)
 	require.NoError(t, err)
 	require.NoError(t, service.cfg.ForkChoiceStore.InsertNode(ctx, state, blkRoot))
 
-	state, blkRoot, err = prepareForkchoiceState(ctx, wsb.Block().Slot(), newRoot, wsb.Block().ParentRoot(), [32]byte{}, ojc, ofc)
+	state, blkRoot, err = prepareForkchoiceState(ctx, wsb.Block().Slot(), newRoot, wsb.Block().ParentRoot(), [32]byte{}, [32]byte{}, ojc, ofc)
 	require.NoError(t, err)
 	require.NoError(t, service.cfg.ForkChoiceStore.InsertNode(ctx, state, blkRoot))
 	headState, err := util.NewBeaconState()
@@ -101,7 +101,7 @@ func TestSaveHead_Different_Reorg(t *testing.T) {
 	require.NoError(t, err)
 	ojc := &ethpb.Checkpoint{Root: params.BeaconConfig().ZeroHash[:]}
 	ofc := &ethpb.Checkpoint{Root: params.BeaconConfig().ZeroHash[:]}
-	state, blkRoot, err := prepareForkchoiceState(ctx, oldBlock.Block().Slot(), oldRoot, oldBlock.Block().ParentRoot(), [32]byte{}, ojc, ofc)
+	state, blkRoot, err := prepareForkchoiceState(ctx, oldBlock.Block().Slot(), oldRoot, oldBlock.Block().ParentRoot(), [32]byte{}, [32]byte{}, ojc, ofc)
 	require.NoError(t, err)
 	require.NoError(t, service.cfg.ForkChoiceStore.InsertNode(ctx, state, blkRoot))
 	service.head = &head{
@@ -110,7 +110,7 @@ func TestSaveHead_Different_Reorg(t *testing.T) {
 	}
 
 	reorgChainParent := [32]byte{'B'}
-	state, blkRoot, err = prepareForkchoiceState(ctx, 0, reorgChainParent, oldRoot, oldBlock.Block().ParentRoot(), ojc, ofc)
+	state, blkRoot, err = prepareForkchoiceState(ctx, 0, reorgChainParent, oldRoot, oldBlock.Block().ParentRoot(), [32]byte{}, ojc, ofc)
 	require.NoError(t, err)
 	require.NoError(t, service.cfg.ForkChoiceStore.InsertNode(ctx, state, blkRoot))
 
@@ -122,7 +122,7 @@ func TestSaveHead_Different_Reorg(t *testing.T) {
 	wsb := util.SaveBlock(t, t.Context(), service.cfg.BeaconDB, newHeadSignedBlock)
 	newRoot, err := newHeadBlock.HashTreeRoot()
 	require.NoError(t, err)
-	state, blkRoot, err = prepareForkchoiceState(ctx, wsb.Block().Slot(), newRoot, wsb.Block().ParentRoot(), [32]byte{}, ojc, ofc)
+	state, blkRoot, err = prepareForkchoiceState(ctx, wsb.Block().Slot(), newRoot, wsb.Block().ParentRoot(), [32]byte{}, [32]byte{}, ojc, ofc)
 	require.NoError(t, err)
 	require.NoError(t, service.cfg.ForkChoiceStore.InsertNode(ctx, state, blkRoot))
 	headState, err := util.NewBeaconState()
@@ -237,11 +237,11 @@ func TestRetrieveHead_ReadOnly(t *testing.T) {
 	wsb := util.SaveBlock(t, t.Context(), service.cfg.BeaconDB, newHeadSignedBlock)
 	newRoot, err := newHeadBlock.HashTreeRoot()
 	require.NoError(t, err)
-	state, blkRoot, err := prepareForkchoiceState(ctx, slots.PrevSlot(wsb.Block().Slot()), wsb.Block().ParentRoot(), service.cfg.ForkChoiceStore.CachedHeadRoot(), [32]byte{}, ojc, ofc)
+	state, blkRoot, err := prepareForkchoiceState(ctx, slots.PrevSlot(wsb.Block().Slot()), wsb.Block().ParentRoot(), service.cfg.ForkChoiceStore.CachedHeadRoot(), [32]byte{}, [32]byte{}, ojc, ofc)
 	require.NoError(t, err)
 	require.NoError(t, service.cfg.ForkChoiceStore.InsertNode(ctx, state, blkRoot))
 
-	state, blkRoot, err = prepareForkchoiceState(ctx, wsb.Block().Slot(), newRoot, wsb.Block().ParentRoot(), [32]byte{}, ojc, ofc)
+	state, blkRoot, err = prepareForkchoiceState(ctx, wsb.Block().Slot(), newRoot, wsb.Block().ParentRoot(), [32]byte{}, [32]byte{}, ojc, ofc)
 	require.NoError(t, err)
 	require.NoError(t, service.cfg.ForkChoiceStore.InsertNode(ctx, state, blkRoot))
 	headState, err := util.NewBeaconState()
@@ -303,7 +303,7 @@ func TestSaveOrphanedAtts(t *testing.T) {
 	for _, blk := range []*ethpb.SignedBeaconBlock{blkG, blk1, blk2, blk3, blk4} {
 		r, err := blk.Block.HashTreeRoot()
 		require.NoError(t, err)
-		state, blkRoot, err := prepareForkchoiceState(ctx, blk.Block.Slot, r, bytesutil.ToBytes32(blk.Block.ParentRoot), [32]byte{}, ojc, ofc)
+		state, blkRoot, err := prepareForkchoiceState(ctx, blk.Block.Slot, r, bytesutil.ToBytes32(blk.Block.ParentRoot), [32]byte{}, [32]byte{}, ojc, ofc)
 		require.NoError(t, err)
 		require.NoError(t, service.cfg.ForkChoiceStore.InsertNode(ctx, state, blkRoot))
 		util.SaveBlock(t, ctx, beaconDB, blk)
@@ -446,7 +446,7 @@ func TestSaveOrphanedOps(t *testing.T) {
 	for _, blk := range []*ethpb.SignedBeaconBlock{blkG, blk1, blk2, blk3, blk4} {
 		r, err := blk.Block.HashTreeRoot()
 		require.NoError(t, err)
-		state, blkRoot, err := prepareForkchoiceState(ctx, blk.Block.Slot, r, bytesutil.ToBytes32(blk.Block.ParentRoot), [32]byte{}, ojc, ofc)
+		state, blkRoot, err := prepareForkchoiceState(ctx, blk.Block.Slot, r, bytesutil.ToBytes32(blk.Block.ParentRoot), [32]byte{}, [32]byte{}, ojc, ofc)
 		require.NoError(t, err)
 		require.NoError(t, service.cfg.ForkChoiceStore.InsertNode(ctx, state, blkRoot))
 		util.SaveBlock(t, ctx, beaconDB, blk)
@@ -516,7 +516,7 @@ func TestSaveOrphanedAtts_CanFilter(t *testing.T) {
 	for _, blk := range []*ethpb.SignedBeaconBlockCapella{blkG, blk1, blk2, blk4} {
 		r, err := blk.Block.HashTreeRoot()
 		require.NoError(t, err)
-		state, blkRoot, err := prepareForkchoiceState(ctx, blk.Block.Slot, r, bytesutil.ToBytes32(blk.Block.ParentRoot), [32]byte{}, ojc, ofc)
+		state, blkRoot, err := prepareForkchoiceState(ctx, blk.Block.Slot, r, bytesutil.ToBytes32(blk.Block.ParentRoot), [32]byte{}, [32]byte{}, ojc, ofc)
 		require.NoError(t, err)
 		require.NoError(t, service.cfg.ForkChoiceStore.InsertNode(ctx, state, blkRoot))
 		util.SaveBlock(t, ctx, beaconDB, blk)
@@ -574,7 +574,7 @@ func TestSaveOrphanedAtts_DoublyLinkedTrie(t *testing.T) {
 	for _, blk := range []*ethpb.SignedBeaconBlock{blkG, blk1, blk2, blk3, blk4} {
 		r, err := blk.Block.HashTreeRoot()
 		require.NoError(t, err)
-		state, blkRoot, err := prepareForkchoiceState(ctx, blk.Block.Slot, r, bytesutil.ToBytes32(blk.Block.ParentRoot), [32]byte{}, ojc, ofc)
+		state, blkRoot, err := prepareForkchoiceState(ctx, blk.Block.Slot, r, bytesutil.ToBytes32(blk.Block.ParentRoot), [32]byte{}, [32]byte{}, ojc, ofc)
 		require.NoError(t, err)
 		require.NoError(t, service.cfg.ForkChoiceStore.InsertNode(ctx, state, blkRoot))
 		util.SaveBlock(t, ctx, beaconDB, blk)
@@ -633,7 +633,7 @@ func TestSaveOrphanedAtts_CanFilter_DoublyLinkedTrie(t *testing.T) {
 	for _, blk := range []*ethpb.SignedBeaconBlock{blkG, blk1, blk2, blk4} {
 		r, err := blk.Block.HashTreeRoot()
 		require.NoError(t, err)
-		state, blkRoot, err := prepareForkchoiceState(ctx, blk.Block.Slot, r, bytesutil.ToBytes32(blk.Block.ParentRoot), [32]byte{}, ojc, ofc)
+		state, blkRoot, err := prepareForkchoiceState(ctx, blk.Block.Slot, r, bytesutil.ToBytes32(blk.Block.ParentRoot), [32]byte{}, [32]byte{}, ojc, ofc)
 		require.NoError(t, err)
 		require.NoError(t, service.cfg.ForkChoiceStore.InsertNode(ctx, state, blkRoot))
 		util.SaveBlock(t, ctx, beaconDB, blk)
@@ -648,7 +648,7 @@ func TestUpdateHead_noSavedChanges(t *testing.T) {
 	ctx, beaconDB, fcs := tr.ctx, tr.db, tr.fcs
 
 	ojp := &ethpb.Checkpoint{Root: params.BeaconConfig().ZeroHash[:]}
-	st, blkRoot, err := prepareForkchoiceState(ctx, 0, [32]byte{}, [32]byte{}, [32]byte{}, ojp, ojp)
+	st, blkRoot, err := prepareForkchoiceState(ctx, 0, [32]byte{}, [32]byte{}, [32]byte{}, [32]byte{}, ojp, ojp)
 	require.NoError(t, err)
 	require.NoError(t, fcs.InsertNode(ctx, st, blkRoot))
 
@@ -668,7 +668,7 @@ func TestUpdateHead_noSavedChanges(t *testing.T) {
 	headRoot := service.headRoot()
 	require.Equal(t, [32]byte{}, headRoot)
 
-	st, blkRoot, err = prepareForkchoiceState(ctx, 0, bellatrixBlkRoot, [32]byte{}, [32]byte{}, fcp, fcp)
+	st, blkRoot, err = prepareForkchoiceState(ctx, 0, bellatrixBlkRoot, [32]byte{}, [32]byte{}, [32]byte{}, fcp, fcp)
 	require.NoError(t, err)
 	require.NoError(t, fcs.InsertNode(ctx, st, blkRoot))
 	fcs.SetBalancesByRooter(func(context.Context, [32]byte) ([]uint64, error) { return []uint64{1, 2}, nil })

beacon-chain/blockchain/log.go

@@ -42,31 +42,47 @@ func logStateTransitionData(b interfaces.ReadOnlyBeaconBlock) error {
 		}
 		log = log.WithField("syncBitsCount", agg.SyncCommitteeBits.Count())
 	}
-	if b.Version() >= version.Bellatrix {
-		p, err := b.Body().Execution()
+	if b.Version() >= version.EPBS {
+		sh, err := b.Body().SignedExecutionPayloadHeader()
 		if err != nil {
 			return err
 		}
-		log = log.WithField("payloadHash", fmt.Sprintf("%#x", bytesutil.Trunc(p.BlockHash())))
-		txs, err := p.Transactions()
-		switch {
-		case errors.Is(err, consensus_types.ErrUnsupportedField):
-		case err != nil:
-			return err
-		default:
-			log = log.WithField("txCount", len(txs))
-			txsPerSlotCount.Set(float64(len(txs)))
-		}
-	}
-	if b.Version() >= version.Deneb {
-		kzgs, err := b.Body().BlobKzgCommitments()
+		header, err := sh.Header()
 		if err != nil {
-			log.WithError(err).Error("Failed to get blob KZG commitments")
-		} else if len(kzgs) > 0 {
-			log = log.WithField("kzgCommitmentCount", len(kzgs))
+			return err
+		}
+		log = log.WithFields(logrus.Fields{"payloadHash": fmt.Sprintf("%#x", header.BlockHash()),
+			"builderIndex":           header.BuilderIndex(),
+			"value":                  header.Value(),
+			"blobKzgCommitmentsRoot": fmt.Sprintf("%#x", header.BlobKzgCommitmentsRoot()),
+		})
+	} else {
+		if b.Version() >= version.Bellatrix {
+			p, err := b.Body().Execution()
+			if err != nil {
+				return err
+			}
+			log = log.WithField("payloadHash", fmt.Sprintf("%#x", bytesutil.Trunc(p.BlockHash())))
+			txs, err := p.Transactions()
+			switch {
+			case errors.Is(err, consensus_types.ErrUnsupportedField):
+			case err != nil:
+				return err
+			default:
+				log = log.WithField("txCount", len(txs))
+				txsPerSlotCount.Set(float64(len(txs)))
+			}
+		}
+		if b.Version() >= version.Deneb {
+			kzgs, err := b.Body().BlobKzgCommitments()
+			if err != nil {
+				log.WithError(err).Error("Failed to get blob KZG commitments")
+			} else if len(kzgs) > 0 {
+				log = log.WithField("kzgCommitmentCount", len(kzgs))
+			}
 		}
 	}
-	if b.Version() >= version.Electra {
+	if b.Version() >= version.Electra && b.Version() < version.EPBS {
 		eReqs, err := b.Body().ExecutionRequests()
 		if err != nil {
 			log.WithError(err).Error("Failed to get execution requests")
@@ -109,6 +125,18 @@ func logBlockSyncStatus(block interfaces.ReadOnlyBeaconBlock, blockRoot [32]byte
 			"chainServiceProcessedTime":  prysmTime.Now().Sub(receivedTime) - daWaitedTime,
 			"dataAvailabilityWaitedTime": daWaitedTime,
 		}
+		if block.Version() >= version.EPBS {
+			ph, err := block.Body().SignedExecutionPayloadHeader()
+			if err != nil {
+				return err
+			}
+			header, err := ph.Header()
+			if err != nil {
+				return err
+			}
+			hash := header.ParentBlockHash()
+			lf["parentHash"] = fmt.Sprintf("0x%s...", hex.EncodeToString(hash[:])[:8])
+		}
 		log.WithFields(lf).Debug("Synced new block")
 	} else {
 		log.WithFields(logrus.Fields{
@@ -124,6 +152,9 @@ func logBlockSyncStatus(block interfaces.ReadOnlyBeaconBlock, blockRoot [32]byte
 
 // logs payload related data every slot.
 func logPayload(block interfaces.ReadOnlyBeaconBlock) error {
+	if block.Version() >= version.EPBS {
+		return nil
+	}
 	isExecutionBlk, err := blocks.IsExecutionBlock(block.Body())
 	if err != nil {
 		return errors.Wrap(err, "could not determine if block is execution block")

beacon-chain/blockchain/metrics.go

@@ -182,6 +182,10 @@ var (
 		Name: "chain_service_processing_milliseconds",
 		Help: "Total time to call a chain service in ReceiveBlock()",
 	})
+	executionEngineProcessingTime = promauto.NewSummary(prometheus.SummaryOpts{
+		Name: "execution_engine_processing_milliseconds",
+		Help: "Total time to process an execution payload envelope in ReceiveExecutionPayloadEnvelope()",
+	})
 	dataAvailWaitedTime = promauto.NewSummary(prometheus.SummaryOpts{
 		Name: "da_waited_time_milliseconds",
 		Help: "Total time spent waiting for a data availability check in ReceiveBlock()",

beacon-chain/blockchain/options.go

@@ -1,6 +1,7 @@
 package blockchain
 
 import (
+	"sync"
 	"time"
 
 	"github.com/OffchainLabs/prysm/v6/async/event"
@@ -81,6 +82,22 @@ func WithDepositCache(c cache.DepositCache) Option {
 	}
 }
 
+// WithPayloadAttestationCache for payload attestation cache.
+func WithPayloadAttestationCache(c *cache.PayloadAttestationCache) Option {
+	return func(s *Service) error {
+		s.cfg.PayloadAttestationCache = c
+		return nil
+	}
+}
+
+// WithPayloadEnvelopeCache for payload envelope cache.
+func WithPayloadEnvelopeCache(c *sync.Map) Option {
+	return func(s *Service) error {
+		s.cfg.PayloadEnvelopeCache = c
+		return nil
+	}
+}
+
 // WithPayloadIDCache for payload ID cache.
 func WithPayloadIDCache(c *cache.PayloadIDCache) Option {
 	return func(s *Service) error {

beacon-chain/blockchain/process_attestation.go

@@ -96,7 +96,7 @@ func (s *Service) OnAttestation(ctx context.Context, a ethpb.Att, disparity time
 	// We assume trusted attestation in this function has verified signature.
 
 	// Update forkchoice store with the new attestation for updating weight.
-	s.cfg.ForkChoiceStore.ProcessAttestation(ctx, indexedAtt.GetAttestingIndices(), bytesutil.ToBytes32(a.GetData().BeaconBlockRoot), a.GetData().Target.Epoch)
+	s.cfg.ForkChoiceStore.ProcessAttestation(ctx, indexedAtt.GetAttestingIndices(), bytesutil.ToBytes32(a.GetData().BeaconBlockRoot), a.GetData().Slot)
 
 	return nil
 }

beacon-chain/blockchain/process_attestation_test.go

@@ -32,7 +32,7 @@ func TestStore_OnAttestation_ErrorConditions(t *testing.T) {
 	util.SaveBlock(t, ctx, beaconDB, blkWithoutState)
 
 	cp := &ethpb.Checkpoint{}
-	st, roblock, err := prepareForkchoiceState(ctx, 0, [32]byte{}, [32]byte{}, params.BeaconConfig().ZeroHash, cp, cp)
+	st, roblock, err := prepareForkchoiceState(ctx, 0, [32]byte{}, [32]byte{}, params.BeaconConfig().ZeroHash, [32]byte{}, cp, cp)
 	require.NoError(t, err)
 	require.NoError(t, service.cfg.ForkChoiceStore.InsertNode(ctx, st, roblock))
 
@@ -41,7 +41,7 @@ func TestStore_OnAttestation_ErrorConditions(t *testing.T) {
 	r, err := blkWithStateBadAtt.Block.HashTreeRoot()
 	require.NoError(t, err)
 	cp = &ethpb.Checkpoint{Root: r[:]}
-	st, roblock, err = prepareForkchoiceState(ctx, blkWithStateBadAtt.Block.Slot, r, [32]byte{}, params.BeaconConfig().ZeroHash, cp, cp)
+	st, roblock, err = prepareForkchoiceState(ctx, blkWithStateBadAtt.Block.Slot, r, [32]byte{}, params.BeaconConfig().ZeroHash, [32]byte{}, cp, cp)
 	require.NoError(t, err)
 	require.NoError(t, service.cfg.ForkChoiceStore.InsertNode(ctx, st, roblock))
 	util.SaveBlock(t, ctx, beaconDB, blkWithStateBadAtt)
@@ -139,7 +139,7 @@ func TestStore_OnAttestation_Ok_DoublyLinkedTree(t *testing.T) {
 		require.NoError(t, service.cfg.BeaconDB.SaveState(ctx, copied, tRoot))
 		ojc := &ethpb.Checkpoint{Epoch: 0, Root: tRoot[:]}
 		ofc := &ethpb.Checkpoint{Epoch: 0, Root: tRoot[:]}
-		state, roblock, err := prepareForkchoiceState(ctx, 0, tRoot, tRoot, params.BeaconConfig().ZeroHash, ojc, ofc)
+		state, roblock, err := prepareForkchoiceState(ctx, 0, tRoot, tRoot, params.BeaconConfig().ZeroHash, [32]byte{}, ojc, ofc)
 		require.NoError(t, err)
 		require.NoError(t, service.cfg.ForkChoiceStore.InsertNode(ctx, state, roblock))
 		require.NoError(t, service.OnAttestation(ctx, att[0], 0))
@@ -170,7 +170,7 @@ func TestService_GetRecentPreState(t *testing.T) {
 	err = s.SetFinalizedCheckpoint(cp0)
 	require.NoError(t, err)
 
-	st, root, err := prepareForkchoiceState(ctx, 31, [32]byte(ckRoot), [32]byte{}, [32]byte{'R'}, cp0, cp0)
+	st, root, err := prepareForkchoiceState(ctx, 31, [32]byte(ckRoot), [32]byte{}, [32]byte{'R'}, [32]byte{}, cp0, cp0)
 	require.NoError(t, err)
 	require.NoError(t, service.cfg.ForkChoiceStore.InsertNode(ctx, st, root))
 	service.head = &head{
@@ -202,7 +202,7 @@ func TestService_GetAttPreState_Concurrency(t *testing.T) {
 	require.NoError(t, service.cfg.BeaconDB.SaveState(ctx, s, bytesutil.ToBytes32([]byte{'A'})))
 	require.NoError(t, service.cfg.BeaconDB.SaveStateSummary(ctx, &ethpb.StateSummary{Root: ckRoot}))
 
-	st, root, err := prepareForkchoiceState(ctx, 100, [32]byte(cp1.Root), [32]byte{}, [32]byte{'R'}, cp1, cp1)
+	st, root, err := prepareForkchoiceState(ctx, 100, [32]byte(cp1.Root), [32]byte{}, [32]byte{'R'}, [32]byte{}, cp1, cp1)
 	require.NoError(t, err)
 	require.NoError(t, service.cfg.ForkChoiceStore.InsertNode(ctx, st, root))
 
@@ -259,7 +259,7 @@ func TestStore_SaveCheckpointState(t *testing.T) {
 	require.NoError(t, service.cfg.BeaconDB.SaveState(ctx, s, bytesutil.ToBytes32([]byte{'A'})))
 	require.NoError(t, service.cfg.BeaconDB.SaveStateSummary(ctx, &ethpb.StateSummary{Root: bytesutil.PadTo([]byte{'A'}, fieldparams.RootLength)}))
 
-	st, root, err := prepareForkchoiceState(ctx, 1, [32]byte(cp1.Root), [32]byte{}, [32]byte{'R'}, cp1, cp1)
+	st, root, err := prepareForkchoiceState(ctx, 1, [32]byte(cp1.Root), [32]byte{}, [32]byte{'R'}, [32]byte{}, cp1, cp1)
 	require.NoError(t, err)
 	require.NoError(t, service.cfg.ForkChoiceStore.InsertNode(ctx, st, root))
 	s1, err := service.getAttPreState(ctx, cp1)
@@ -273,7 +273,7 @@ func TestStore_SaveCheckpointState(t *testing.T) {
 	_, err = service.getAttPreState(ctx, cp2)
 	require.ErrorContains(t, "epoch 2 root 0x4200000000000000000000000000000000000000000000000000000000000000: not a checkpoint in forkchoice", err)
 
-	st, root, err = prepareForkchoiceState(ctx, 33, [32]byte(cp2.Root), [32]byte(cp1.Root), [32]byte{'R'}, cp2, cp2)
+	st, root, err = prepareForkchoiceState(ctx, 33, [32]byte(cp2.Root), [32]byte(cp1.Root), [32]byte{'R'}, [32]byte{}, cp2, cp2)
 	require.NoError(t, err)
 	require.NoError(t, service.cfg.ForkChoiceStore.InsertNode(ctx, st, root))
 
@@ -298,7 +298,7 @@ func TestStore_SaveCheckpointState(t *testing.T) {
 	cp3 := &ethpb.Checkpoint{Epoch: 1, Root: bytesutil.PadTo([]byte{'C'}, fieldparams.RootLength)}
 	require.NoError(t, service.cfg.BeaconDB.SaveState(ctx, s, bytesutil.ToBytes32([]byte{'C'})))
 	require.NoError(t, service.cfg.BeaconDB.SaveStateSummary(ctx, &ethpb.StateSummary{Root: bytesutil.PadTo([]byte{'C'}, fieldparams.RootLength)}))
-	st, root, err = prepareForkchoiceState(ctx, 31, [32]byte(cp3.Root), [32]byte(cp2.Root), [32]byte{'P'}, cp2, cp2)
+	st, root, err = prepareForkchoiceState(ctx, 31, [32]byte(cp3.Root), [32]byte(cp2.Root), [32]byte{'P'}, [32]byte{}, cp2, cp2)
 	require.NoError(t, err)
 	require.NoError(t, service.cfg.ForkChoiceStore.InsertNode(ctx, st, root))
 
@@ -318,7 +318,7 @@ func TestStore_UpdateCheckpointState(t *testing.T) {
 	require.NoError(t, err)
 	checkpoint := &ethpb.Checkpoint{Epoch: epoch, Root: r1[:]}
 	require.NoError(t, service.cfg.BeaconDB.SaveState(ctx, baseState, bytesutil.ToBytes32(checkpoint.Root)))
-	st, roblock, err := prepareForkchoiceState(ctx, blk.Block.Slot, r1, [32]byte{}, params.BeaconConfig().ZeroHash, checkpoint, checkpoint)
+	st, roblock, err := prepareForkchoiceState(ctx, blk.Block.Slot, r1, [32]byte{}, params.BeaconConfig().ZeroHash, [32]byte{}, checkpoint, checkpoint)
 	require.NoError(t, err)
 	require.NoError(t, service.cfg.ForkChoiceStore.InsertNode(ctx, st, roblock))
 	returned, err := service.getAttPreState(ctx, checkpoint)
@@ -336,7 +336,7 @@ func TestStore_UpdateCheckpointState(t *testing.T) {
 	require.NoError(t, err)
 	newCheckpoint := &ethpb.Checkpoint{Epoch: epoch, Root: r2[:]}
 	require.NoError(t, service.cfg.BeaconDB.SaveState(ctx, baseState, bytesutil.ToBytes32(newCheckpoint.Root)))
-	st, roblock, err = prepareForkchoiceState(ctx, blk.Block.Slot, r2, r1, params.BeaconConfig().ZeroHash, newCheckpoint, newCheckpoint)
+	st, roblock, err = prepareForkchoiceState(ctx, blk.Block.Slot, r2, r1, params.BeaconConfig().ZeroHash, [32]byte{}, newCheckpoint, newCheckpoint)
 	require.NoError(t, err)
 	require.NoError(t, service.cfg.ForkChoiceStore.InsertNode(ctx, st, roblock))
 	returned, err = service.getAttPreState(ctx, newCheckpoint)

beacon-chain/blockchain/process_block.go

@@ -68,7 +68,9 @@ func (s *Service) postBlockProcess(cfg *postBlockProcessConfig) error {
 	fcuArgs := &fcuConfig{}
 
 	if s.inRegularSync() {
-		defer s.handleSecondFCUCall(cfg, fcuArgs)
+		if cfg.roblock.Version() < version.EPBS {
+			defer s.handleSecondFCUCall(cfg, fcuArgs)
+		}
 	}
 	if features.Get().EnableLightClient && slots.ToEpoch(s.CurrentSlot()) >= params.BeaconConfig().AltairForkEpoch {
 		defer s.processLightClientUpdates(cfg)
@@ -104,6 +106,16 @@ func (s *Service) postBlockProcess(cfg *postBlockProcessConfig) error {
 		s.logNonCanonicalBlockReceived(cfg.roblock.Root(), cfg.headRoot)
 		return nil
 	}
+	if cfg.roblock.Version() >= version.EPBS {
+		if err := s.saveHead(ctx, cfg.headRoot, cfg.roblock, cfg.postState); err != nil {
+			log.WithError(err).Error("Could not save head")
+		}
+		s.pruneAttsFromPool(ctx, cfg.postState, cfg.roblock)
+
+		// update the NSC and handle epoch boundaries here since we do
+		// not send FCU at all
+		return s.updateCachesPostBlockProcessing(cfg)
+	}
 	if err := s.getFCUArgs(cfg, fcuArgs); err != nil {
 		log.WithError(err).Error("Could not get forkchoice update argument")
 		return nil
@@ -384,7 +396,7 @@ func (s *Service) handleBlockAttestations(ctx context.Context, blk interfaces.Re
 		}
 		r := bytesutil.ToBytes32(a.GetData().BeaconBlockRoot)
 		if s.cfg.ForkChoiceStore.HasNode(r) {
-			s.cfg.ForkChoiceStore.ProcessAttestation(ctx, indices, r, a.GetData().Target.Epoch)
+			s.cfg.ForkChoiceStore.ProcessAttestation(ctx, indices, r, a.GetData().Slot)
 		} else if features.Get().EnableExperimentalAttestationPool {
 			if err = s.cfg.AttestationCache.Add(a); err != nil {
 				return err
@@ -568,9 +580,15 @@ func (s *Service) runLateBlockTasks() {
 
 	attThreshold := params.BeaconConfig().SecondsPerSlot / 3
 	ticker := slots.NewSlotTickerWithOffset(s.genesisTime, time.Duration(attThreshold)*time.Second, params.BeaconConfig().SecondsPerSlot)
+	epbs := params.BeaconConfig().EPBSForkEpoch
 	for {
 		select {
-		case <-ticker.C():
+		case slot := <-ticker.C():
+			if slots.ToEpoch(slot) == epbs && slot%32 == 0 {
+				ticker.Done()
+				attThreshold := params.BeaconConfig().SecondsPerSlot / 4
+				ticker = slots.NewSlotTickerWithOffset(s.genesisTime, time.Duration(attThreshold)*time.Second, params.BeaconConfig().SecondsPerSlot)
+			}
 			s.lateBlockTasks(s.ctx)
 		case <-s.ctx.Done():
 			log.Debug("Context closed, exiting routine")
@@ -958,24 +976,36 @@ func (s *Service) lateBlockTasks(ctx context.Context) {
 		return
 	}
 
-	s.headLock.RLock()
-	headBlock, err := s.headBlock()
-	if err != nil {
+	if headState.Version() >= version.EPBS {
+		bh, err := headState.LatestBlockHash()
+		if err != nil {
+			log.WithError(err).Debug("could not perform late block tasks: failed to retrieve latest block hash")
+			return
+		}
+		_, err = s.notifyForkchoiceUpdateEPBS(ctx, [32]byte(bh), attribute)
+		if err != nil {
+			log.WithError(err).Debug("could not perform late block tasks: failed to update forkchoice with engine")
+		}
+	} else {
+		s.headLock.RLock()
+		headBlock, err := s.headBlock()
+		if err != nil {
+			s.headLock.RUnlock()
+			log.WithError(err).Debug("could not perform late block tasks: failed to retrieve head block")
+			return
+		}
 		s.headLock.RUnlock()
-		log.WithError(err).Debug("could not perform late block tasks: failed to retrieve head block")
-		return
-	}
-	s.headLock.RUnlock()
 
-	fcuArgs := &fcuConfig{
-		headState:  headState,
-		headRoot:   headRoot,
-		headBlock:  headBlock,
-		attributes: attribute,
-	}
-	_, err = s.notifyForkchoiceUpdate(ctx, fcuArgs)
-	if err != nil {
-		log.WithError(err).Debug("could not perform late block tasks: failed to update forkchoice with engine")
+		fcuArgs := &fcuConfig{
+			headState:  headState,
+			headRoot:   headRoot,
+			headBlock:  headBlock,
+			attributes: attribute,
+		}
+		_, err = s.notifyForkchoiceUpdate(ctx, fcuArgs)
+		if err != nil {
+			log.WithError(err).Debug("could not perform late block tasks: failed to update forkchoice with engine")
+		}
 	}
 }
 

beacon-chain/blockchain/process_block_helpers.go

@@ -338,7 +338,31 @@ func (s *Service) getBlockPreState(ctx context.Context, b interfaces.ReadOnlyBea
 		return nil, err
 	}
 
-	preState, err := s.cfg.StateGen.StateByRoot(ctx, b.ParentRoot())
+	parentRoot := b.ParentRoot()
+	s.ForkChoicer().RLock()
+	slot, err := s.ForkChoicer().Slot(parentRoot)
+	s.ForkChoicer().RUnlock()
+	if err != nil {
+		return nil, errors.Wrap(err, "could not get slot for parent root")
+	}
+	if slots.ToEpoch(slot) >= params.BeaconConfig().EPBSForkEpoch {
+		s.ForkChoicer().RLock()
+		parentHash := s.ForkChoicer().HashForBlockRoot(parentRoot)
+		s.ForkChoicer().RUnlock()
+		signedBid, err := b.Body().SignedExecutionPayloadHeader()
+		if err != nil {
+			return nil, errors.Wrap(err, "could not get signed execution payload header")
+		}
+		bid, err := signedBid.Header()
+		if err != nil {
+			return nil, errors.Wrap(err, "could not get execution payload header")
+		}
+		if parentHash == bid.ParentBlockHash() {
+			// It's based on full, use the state by hash
+			parentRoot = parentHash
+		}
+	}
+	preState, err := s.cfg.StateGen.StateByRoot(ctx, parentRoot)
 	if err != nil {
 		return nil, errors.Wrapf(err, "could not get pre state for slot %d", b.Slot())
 	}

beacon-chain/blockchain/process_block_test.go

@@ -232,7 +232,7 @@ func TestFillForkChoiceMissingBlocks_CanSave(t *testing.T) {
 	// the parent of the last block inserted is the tree node.
 	fcp := &ethpb.Checkpoint{Epoch: 0, Root: service.originBlockRoot[:]}
 	r0 := bytesutil.ToBytes32(roots[0])
-	state, blkRoot, err := prepareForkchoiceState(ctx, 0, r0, service.originBlockRoot, [32]byte{}, fcp, fcp)
+	state, blkRoot, err := prepareForkchoiceState(ctx, 0, r0, service.originBlockRoot, [32]byte{}, [32]byte{}, fcp, fcp)
 	require.NoError(t, err)
 	require.NoError(t, service.cfg.ForkChoiceStore.InsertNode(ctx, state, blkRoot))
 	fcp2 := &forkchoicetypes.Checkpoint{Epoch: 0, Root: r0}
@@ -274,7 +274,7 @@ func TestFillForkChoiceMissingBlocks_RootsMatch(t *testing.T) {
 	// the parent of the last block inserted is the tree node.
 	fcp := &ethpb.Checkpoint{Epoch: 0, Root: service.originBlockRoot[:]}
 	r0 := bytesutil.ToBytes32(roots[0])
-	state, blkRoot, err := prepareForkchoiceState(ctx, 0, r0, service.originBlockRoot, [32]byte{}, fcp, fcp)
+	state, blkRoot, err := prepareForkchoiceState(ctx, 0, r0, service.originBlockRoot, [32]byte{}, [32]byte{}, fcp, fcp)
 	require.NoError(t, err)
 	require.NoError(t, service.cfg.ForkChoiceStore.InsertNode(ctx, state, blkRoot))
 	fcp2 := &forkchoicetypes.Checkpoint{Epoch: 0, Root: r0}
@@ -555,7 +555,7 @@ func TestAncestor_CanUseForkchoice(t *testing.T) {
 		beaconBlock.Block.ParentRoot = bytesutil.PadTo(b.Block.ParentRoot, 32)
 		r, err := b.Block.HashTreeRoot()
 		require.NoError(t, err)
-		st, blkRoot, err := prepareForkchoiceState(t.Context(), b.Block.Slot, r, bytesutil.ToBytes32(b.Block.ParentRoot), params.BeaconConfig().ZeroHash, ojc, ofc)
+		st, blkRoot, err := prepareForkchoiceState(t.Context(), b.Block.Slot, r, bytesutil.ToBytes32(b.Block.ParentRoot), params.BeaconConfig().ZeroHash, [32]byte{}, ojc, ofc)
 		require.NoError(t, err)
 		require.NoError(t, service.cfg.ForkChoiceStore.InsertNode(ctx, st, blkRoot))
 	}
@@ -595,7 +595,7 @@ func TestAncestor_CanUseDB(t *testing.T) {
 		util.SaveBlock(t, t.Context(), beaconDB, beaconBlock)
 	}
 
-	st, blkRoot, err := prepareForkchoiceState(t.Context(), 200, r200, r200, params.BeaconConfig().ZeroHash, ojc, ofc)
+	st, blkRoot, err := prepareForkchoiceState(t.Context(), 200, r200, r200, params.BeaconConfig().ZeroHash, [32]byte{}, ojc, ofc)
 	require.NoError(t, err)
 	require.NoError(t, service.cfg.ForkChoiceStore.InsertNode(ctx, st, blkRoot))
 
@@ -1247,7 +1247,7 @@ func TestOnBlock_ProcessBlocksParallel(t *testing.T) {
 	logHook := logTest.NewGlobal()
 	for i := 0; i < 10; i++ {
 		fc := &ethpb.Checkpoint{}
-		st, blkRoot, err := prepareForkchoiceState(ctx, 0, wsb1.Block().ParentRoot(), [32]byte{}, [32]byte{}, fc, fc)
+		st, blkRoot, err := prepareForkchoiceState(ctx, 0, wsb1.Block().ParentRoot(), [32]byte{}, [32]byte{}, [32]byte{}, fc, fc)
 		require.NoError(t, err)
 		require.NoError(t, service.cfg.ForkChoiceStore.InsertNode(ctx, st, blkRoot))
 		var wg sync.WaitGroup

beacon-chain/blockchain/receive_attestation.go

@@ -10,6 +10,7 @@ import (
 	"github.com/OffchainLabs/prysm/v6/beacon-chain/state"
 	"github.com/OffchainLabs/prysm/v6/config/features"
 	"github.com/OffchainLabs/prysm/v6/config/params"
+	payloadattribute "github.com/OffchainLabs/prysm/v6/consensus-types/payload-attribute"
 	"github.com/OffchainLabs/prysm/v6/consensus-types/primitives"
 	"github.com/OffchainLabs/prysm/v6/encoding/bytesutil"
 	"github.com/OffchainLabs/prysm/v6/monitoring/tracing/trace"
@@ -148,15 +149,33 @@ func (s *Service) UpdateHead(ctx context.Context, proposingSlot primitives.Slot)
 		return
 	}
 	newAttHeadElapsedTime.Observe(float64(time.Since(start).Milliseconds()))
+	var attributes payloadattribute.Attributer
+	if s.inRegularSync() {
+		attributes = s.getPayloadAttribute(ctx, headState, proposingSlot, newHeadRoot[:])
+	}
+	if headState.Version() >= version.EPBS {
+		bh, err := headState.LatestBlockHash()
+		if err != nil {
+			log.WithError(err).Error("Could not get latest block hash")
+			return
+		}
+		_, err = s.notifyForkchoiceUpdateEPBS(ctx, [32]byte(bh), attributes)
+		if err != nil {
+			log.WithError(err).Error("Could not notify forkchoice update")
+		}
+		if err := s.saveHead(ctx, newHeadRoot, headBlock, headState); err != nil {
+			log.WithError(err).Error("Could not save head")
+			return
+		}
+		s.pruneAttsFromPool(ctx, headState, headBlock)
+		return
+	}
 	fcuArgs := &fcuConfig{
 		headState:     headState,
 		headRoot:      newHeadRoot,
 		headBlock:     headBlock,
 		proposingSlot: proposingSlot,
 	}
-	if s.inRegularSync() {
-		fcuArgs.attributes = s.getPayloadAttribute(ctx, headState, proposingSlot, newHeadRoot[:])
-	}
 	if fcuArgs.attributes != nil && s.shouldOverrideFCU(newHeadRoot, proposingSlot) {
 		return
 	}
@@ -184,7 +203,7 @@ func (s *Service) processAttestations(ctx context.Context, disparity time.Durati
 		}
 
 		hasState := s.cfg.BeaconDB.HasStateSummary(ctx, bytesutil.ToBytes32(a.GetData().BeaconBlockRoot))
-		hasBlock := s.hasBlock(ctx, bytesutil.ToBytes32(a.GetData().BeaconBlockRoot))
+		hasBlock := s.chainHasBlock(ctx, bytesutil.ToBytes32(a.GetData().BeaconBlockRoot))
 		if !(hasState && hasBlock) {
 			continue
 		}

beacon-chain/blockchain/receive_attestation_test.go

@@ -41,11 +41,11 @@ func TestVerifyLMDFFGConsistent(t *testing.T) {
 
 	f := service.cfg.ForkChoiceStore
 	fc := &ethpb.Checkpoint{Root: params.BeaconConfig().ZeroHash[:]}
-	state, r32, err := prepareForkchoiceState(ctx, 32, [32]byte{'a'}, params.BeaconConfig().ZeroHash, params.BeaconConfig().ZeroHash, fc, fc)
+	state, r32, err := prepareForkchoiceState(ctx, 32, [32]byte{'a'}, params.BeaconConfig().ZeroHash, params.BeaconConfig().ZeroHash, [32]byte{}, fc, fc)
 	require.NoError(t, err)
 	require.NoError(t, f.InsertNode(ctx, state, r32))
 
-	state, r33, err := prepareForkchoiceState(ctx, 33, [32]byte{'b'}, r32.Root(), params.BeaconConfig().ZeroHash, fc, fc)
+	state, r33, err := prepareForkchoiceState(ctx, 33, [32]byte{'b'}, r32.Root(), params.BeaconConfig().ZeroHash, [32]byte{}, fc, fc)
 	require.NoError(t, err)
 	require.NoError(t, f.InsertNode(ctx, state, r33))
 
@@ -81,7 +81,7 @@ func TestProcessAttestations_Ok(t *testing.T) {
 	require.NoError(t, service.cfg.BeaconDB.SaveState(ctx, copied, tRoot))
 	ofc := &ethpb.Checkpoint{Root: params.BeaconConfig().ZeroHash[:]}
 	ojc := &ethpb.Checkpoint{Root: params.BeaconConfig().ZeroHash[:]}
-	state, blkRoot, err := prepareForkchoiceState(ctx, 0, tRoot, tRoot, params.BeaconConfig().ZeroHash, ojc, ofc)
+	state, blkRoot, err := prepareForkchoiceState(ctx, 0, tRoot, tRoot, params.BeaconConfig().ZeroHash, [32]byte{}, ojc, ofc)
 	require.NoError(t, err)
 	require.NoError(t, service.cfg.ForkChoiceStore.InsertNode(ctx, state, blkRoot))
 	attsToSave := make([]ethpb.Att, len(atts))
@@ -141,7 +141,7 @@ func TestService_ProcessAttestationsAndUpdateHead(t *testing.T) {
 	r, err := b.Block.HashTreeRoot()
 	require.NoError(t, err)
 	util.SaveBlock(t, ctx, service.cfg.BeaconDB, b)
-	state, blkRoot, err := prepareForkchoiceState(ctx, 2, r, service.originBlockRoot, [32]byte{'b'}, ojc, ojc)
+	state, blkRoot, err := prepareForkchoiceState(ctx, 2, r, service.originBlockRoot, [32]byte{'b'}, [32]byte{}, ojc, ojc)
 	require.NoError(t, err)
 	require.NoError(t, service.cfg.ForkChoiceStore.InsertNode(ctx, state, blkRoot))
 	require.Equal(t, 3, fcs.NodeCount())
@@ -190,7 +190,7 @@ func TestService_UpdateHead_NoAtts(t *testing.T) {
 	r, err := b.Block.HashTreeRoot()
 	require.NoError(t, err)
 	util.SaveBlock(t, ctx, service.cfg.BeaconDB, b)
-	state, blkRoot, err := prepareForkchoiceState(ctx, 2, r, service.originBlockRoot, [32]byte{'b'}, ojc, ojc)
+	state, blkRoot, err := prepareForkchoiceState(ctx, 2, r, service.originBlockRoot, [32]byte{'b'}, [32]byte{}, ojc, ojc)
 	require.NoError(t, err)
 	require.NoError(t, service.cfg.ForkChoiceStore.InsertNode(ctx, state, blkRoot))
 	require.Equal(t, 3, fcs.NodeCount())

beacon-chain/blockchain/receive_block.go

@@ -41,10 +41,18 @@ var epochsSinceFinalityExpandCache = primitives.Epoch(4)
 // BlockReceiver interface defines the methods of chain service for receiving and processing new blocks.
 type BlockReceiver interface {
 	ReceiveBlock(ctx context.Context, block interfaces.ReadOnlySignedBeaconBlock, blockRoot [32]byte, avs das.AvailabilityStore) error
+	ReceiveExecutionPayloadEnvelope(ctx context.Context, env interfaces.ROSignedExecutionPayloadEnvelope, avs das.AvailabilityStore) error
 	ReceiveBlockBatch(ctx context.Context, blocks []blocks.ROBlock, avs das.AvailabilityStore) error
 	HasBlock(ctx context.Context, root [32]byte) bool
 	RecentBlockSlot(root [32]byte) (primitives.Slot, error)
 	BlockBeingSynced([32]byte) bool
+	PayloadBeingSynced([32]byte) bool
+}
+
+// PayloadAttestationReceiver defines methods of the chain service for receiving
+// and processing new payload attestations and payload attestation messages
+type PayloadAttestationReceiver interface {
+	ReceivePayloadAttestationMessage(ctx context.Context, a *ethpb.PayloadAttestationMessage) error
 }
 
 // BlobReceiver interface defines the methods of chain service for receiving new
@@ -60,6 +68,11 @@ type DataColumnReceiver interface {
 	ReceiveDataColumns([]blocks.VerifiedRODataColumn) error
 }
 
+// ExecutionPayloadReceiver interface defines the methods of chain service for receiving `ROExecutionPayloadEnvelope`.
+type ExecutionPayloadReceiver interface {
+	ReceiveExecutionPayloadEnvelope(ctx context.Context, envelope interfaces.ROSignedExecutionPayloadEnvelope, _ das.AvailabilityStore) error
+}
+
 // SlashingReceiver interface defines the methods of chain service for receiving validated slashing over the wire.
 type SlashingReceiver interface {
 	ReceiveAttesterSlashing(ctx context.Context, slashing ethpb.AttSlashing)
@@ -103,14 +116,30 @@ func (s *Service) ReceiveBlock(ctx context.Context, block interfaces.ReadOnlySig
 		return err
 	}
 
-	postState, isValidPayload, err := s.validateExecutionAndConsensus(ctx, preState, roblock)
-	if err != nil {
-		return err
-	}
-
-	daWaitedTime, err := s.handleDA(ctx, blockCopy, blockRoot, avs)
-	if err != nil {
-		return err
+	var postState state.BeaconState
+	var isValidPayload bool
+	var daWaitedTime time.Duration
+	if blockCopy.Version() >= version.EPBS {
+		postState, err = s.validateStateTransition(ctx, preState, roblock)
+		if err != nil {
+			return errors.Wrap(err, "could not validate state transition")
+		}
+		optimistic, err := s.IsOptimisticForRoot(ctx, roblock.Block().ParentRoot())
+		if err != nil {
+			return errors.Wrap(err, "could not check if parent is optimistic")
+		}
+		// if the parent is not optimistic then we can set the block as
+		// not optimistic.
+		isValidPayload = !optimistic
+	} else {
+		postState, isValidPayload, err = s.validateExecutionAndConsensus(ctx, preState, roblock)
+		if err != nil {
+			return err
+		}
+		daWaitedTime, err = s.handleDA(ctx, blockCopy, blockRoot, avs)
+		if err != nil {
+			return err
+		}
 	}
 
 	// Defragment the state before continuing block processing.

beacon-chain/blockchain/receive_execution_payload_envelope.go

@@ -0,0 +1,255 @@
+package blockchain
+
+import (
+	"bytes"
+	"context"
+	"fmt"
+	"time"
+
+	"github.com/OffchainLabs/prysm/v6/beacon-chain/core/epbs"
+	"github.com/OffchainLabs/prysm/v6/beacon-chain/core/feed"
+	statefeed "github.com/OffchainLabs/prysm/v6/beacon-chain/core/feed/state"
+	"github.com/OffchainLabs/prysm/v6/beacon-chain/core/transition"
+	"github.com/OffchainLabs/prysm/v6/beacon-chain/das"
+	"github.com/OffchainLabs/prysm/v6/beacon-chain/execution"
+	"github.com/OffchainLabs/prysm/v6/beacon-chain/state"
+	"github.com/OffchainLabs/prysm/v6/consensus-types/interfaces"
+	"github.com/OffchainLabs/prysm/v6/encoding/bytesutil"
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/pkg/errors"
+	"github.com/sirupsen/logrus"
+	"go.opencensus.io/trace"
+	"golang.org/x/sync/errgroup"
+)
+
+// ReceiveExecutionPayloadEnvelope is a function that defines the operations (minus pubsub)
+// that are performed on a received execution payload envelope. The operations consist of:
+//  1. Validate the payload, apply state transition.
+//  2. Apply fork choice to the processed payload
+//  3. Save latest head info
+func (s *Service) ReceiveExecutionPayloadEnvelope(ctx context.Context, signed interfaces.ROSignedExecutionPayloadEnvelope, _ das.AvailabilityStore) error {
+	receivedTime := time.Now()
+	envelope, err := signed.Envelope()
+	if err != nil {
+		return err
+	}
+	root := envelope.BeaconBlockRoot()
+	s.payloadBeingSynced.set(envelope)
+	defer s.payloadBeingSynced.unset(root)
+
+	preState, err := s.getPayloadEnvelopePrestate(ctx, envelope)
+	if err != nil {
+		return errors.Wrap(err, "could not get prestate")
+	}
+
+	eg, _ := errgroup.WithContext(ctx)
+	eg.Go(func() error {
+		if err := epbs.ValidatePayloadStateTransition(ctx, preState, envelope); err != nil {
+			return errors.Wrap(err, "failed to validate consensus state transition function")
+		}
+		return nil
+	})
+	var isValidPayload bool
+	eg.Go(func() error {
+		var err error
+		isValidPayload, err = s.validateExecutionOnEnvelope(ctx, envelope)
+		if err != nil {
+			return errors.Wrap(err, "could not notify the engine of the new payload")
+		}
+		return nil
+	})
+
+	if err := eg.Wait(); err != nil {
+		return err
+	}
+	daStartTime := time.Now()
+	// TODO: Add DA check
+	daWaitedTime := time.Since(daStartTime)
+	dataAvailWaitedTime.Observe(float64(daWaitedTime.Milliseconds()))
+	if err := s.savePostPayload(ctx, signed, preState); err != nil {
+		return err
+	}
+	if err := s.insertPayloadEnvelope(envelope); err != nil {
+		return errors.Wrap(err, "could not insert payload to forkchoice")
+	}
+	if isValidPayload {
+		s.ForkChoicer().Lock()
+		if err := s.ForkChoicer().SetOptimisticToValid(ctx, root); err != nil {
+			s.ForkChoicer().Unlock()
+			return errors.Wrap(err, "could not set optimistic payload to valid")
+		}
+		s.ForkChoicer().Unlock()
+	}
+
+	headRoot, err := s.HeadRoot(ctx)
+	if err != nil {
+		log.WithError(err).Error("Could not get headroot to compute attributes")
+		return nil
+	}
+	execution, err := envelope.Execution()
+	if err != nil {
+		log.WithError(err).Error("Could not get execution data")
+		return nil
+	}
+	blockHash := [32]byte(execution.BlockHash())
+	if bytes.Equal(headRoot, root[:]) {
+		attr := s.getPayloadAttribute(ctx, preState, envelope.Slot()+1, headRoot)
+		payloadID, err := s.notifyForkchoiceUpdateEPBS(ctx, blockHash, attr)
+		if err != nil {
+			if IsInvalidBlock(err) {
+				// TODO handle the lvh here
+				return err
+			}
+			return nil
+		}
+		if attr != nil && !attr.IsEmpty() && payloadID != nil {
+			var pid [8]byte
+			copy(pid[:], payloadID[:])
+			log.WithFields(logrus.Fields{
+				"blockRoot": fmt.Sprintf("%#x", bytesutil.Trunc(headRoot)),
+				"headSlot":  envelope.Slot(),
+				"payloadID": fmt.Sprintf("%#x", bytesutil.Trunc(payloadID[:])),
+			}).Info("Forkchoice updated with payload attributes for proposal")
+			s.cfg.PayloadIDCache.Set(envelope.Slot()+1, root, pid)
+		}
+		// simply update the headstate in head
+		s.headLock.Lock()
+		s.head.state = preState.Copy()
+		s.headLock.Unlock()
+		// update the NSC with the hash for the full block, we use the block hash as the key
+		if err := transition.UpdateNextSlotCache(ctx, blockHash[:], preState); err != nil {
+			log.WithError(err).Error("Could not update next slot cache with payload")
+		}
+
+	}
+	timeWithoutDaWait := time.Since(receivedTime) - daWaitedTime
+	executionEngineProcessingTime.Observe(float64(timeWithoutDaWait.Milliseconds()))
+	ex, err := envelope.Execution()
+	if err != nil {
+		return errors.Wrap(err, "could not get execution data")
+	}
+	// Send feed event
+	// Send notification of the processed block to the state feed.
+	s.cfg.StateNotifier.StateFeed().Send(&feed.Event{
+		Type: statefeed.PayloadProcessed,
+		Data: &statefeed.PayloadProcessedData{
+			Slot:                envelope.Slot(),
+			BlockRoot:           root,
+			ExecutionBlockHash:  blockHash,
+			ExecutionOptimistic: !isValidPayload,
+		},
+	})
+
+	log.WithFields(logrus.Fields{
+		"slot":       envelope.Slot(),
+		"blockRoot":  fmt.Sprintf("%#x", bytesutil.Trunc(root[:])),
+		"blockHash":  fmt.Sprintf("%#x", bytesutil.Trunc(ex.BlockHash())),
+		"ParentHash": fmt.Sprintf("%#x", bytesutil.Trunc(ex.ParentHash())),
+	}).Info("Processed execution payload envelope")
+	return nil
+}
+
+// notifyNewPayload signals execution engine on a new payload.
+// It returns true if the EL has returned VALID for the block
+func (s *Service) notifyNewEnvelope(ctx context.Context, envelope interfaces.ROExecutionPayloadEnvelope) (bool, error) {
+	ctx, span := trace.StartSpan(ctx, "blockChain.notifyNewPayload")
+	defer span.End()
+
+	payload, err := envelope.Execution()
+	if err != nil {
+		return false, errors.Wrap(err, "could not get execution payload")
+	}
+
+	versionedHashes := envelope.VersionedHashes()
+	root := envelope.BeaconBlockRoot()
+	parentRoot, err := s.ParentRoot(root)
+	if err != nil {
+		return false, errors.Wrap(err, "could not get parent block root")
+	}
+	pr := common.Hash(parentRoot)
+	requests := envelope.ExecutionRequests()
+	lastValidHash, err := s.cfg.ExecutionEngineCaller.NewPayload(ctx, payload, versionedHashes, &pr, requests)
+	switch {
+	case err == nil:
+		newPayloadValidNodeCount.Inc()
+		return true, nil
+	case errors.Is(err, execution.ErrAcceptedSyncingPayloadStatus):
+		newPayloadOptimisticNodeCount.Inc()
+		log.WithFields(logrus.Fields{
+			"payloadBlockHash": fmt.Sprintf("%#x", bytesutil.Trunc(payload.BlockHash())),
+		}).Info("Called new payload with optimistic block")
+		return false, nil
+	case errors.Is(err, execution.ErrInvalidPayloadStatus):
+		lvh := bytesutil.ToBytes32(lastValidHash)
+		return false, invalidBlock{
+			error:         ErrInvalidPayload,
+			lastValidHash: lvh,
+		}
+	default:
+		return false, errors.WithMessage(ErrUndefinedExecutionEngineError, err.Error())
+	}
+}
+
+// validateExecutionOnEnvelope notifies the engine of the incoming execution payload and returns true if the payload is valid
+func (s *Service) validateExecutionOnEnvelope(ctx context.Context, e interfaces.ROExecutionPayloadEnvelope) (bool, error) {
+	isValidPayload, err := s.notifyNewEnvelope(ctx, e)
+	if err == nil {
+		return isValidPayload, nil
+	}
+	blockRoot := e.BeaconBlockRoot()
+	parentRoot, rootErr := s.ParentRoot(blockRoot)
+	if rootErr != nil {
+		return false, errors.Wrap(rootErr, "could not get parent block root")
+	}
+	s.cfg.ForkChoiceStore.Lock()
+	err = s.handleInvalidExecutionError(ctx, err, blockRoot, parentRoot)
+	s.cfg.ForkChoiceStore.Unlock()
+	return false, err
+}
+
+func (s *Service) getPayloadEnvelopePrestate(ctx context.Context, e interfaces.ROExecutionPayloadEnvelope) (state.BeaconState, error) {
+	ctx, span := trace.StartSpan(ctx, "blockChain.getPayloadEnvelopePreState")
+	defer span.End()
+
+	// Verify incoming payload has a valid pre state.
+	root := e.BeaconBlockRoot()
+	// Verify the referred block is known to forkchoice
+	if !s.InForkchoice(root) {
+		return nil, errors.New("Cannot import execution payload envelope for unknown block")
+	}
+	if err := s.verifyBlkPreState(ctx, root); err != nil {
+		return nil, errors.Wrap(err, "could not verify payload prestate")
+	}
+
+	preState, err := s.cfg.StateGen.StateByRoot(ctx, root)
+	if err != nil {
+		return nil, errors.Wrap(err, "could not get pre state")
+	}
+	if preState == nil || preState.IsNil() {
+		return nil, errors.Wrap(err, "nil pre state")
+	}
+	return preState, nil
+}
+
+func (s *Service) savePostPayload(ctx context.Context, signed interfaces.ROSignedExecutionPayloadEnvelope, st state.BeaconState) error {
+	if err := s.cfg.BeaconDB.SaveBlindPayloadEnvelope(ctx, signed); err != nil {
+		return err
+	}
+	envelope, err := signed.Envelope()
+	if err != nil {
+		return err
+	}
+	execution, err := envelope.Execution()
+	if err != nil {
+		return err
+	}
+	r := envelope.BeaconBlockRoot()
+	if err := s.cfg.StateGen.SaveState(ctx, [32]byte(execution.BlockHash()), st); err != nil {
+		log.Warnf("Rolling back insertion of block with root %#x", r)
+		if err := s.cfg.BeaconDB.DeleteBlock(ctx, r); err != nil {
+			log.WithError(err).Errorf("Could not delete block with block root %#x", r)
+		}
+		return errors.Wrap(err, "could not save state")
+	}
+	return nil
+}

beacon-chain/blockchain/receive_execution_payload_envelope_test.go

@@ -0,0 +1,103 @@
+package blockchain
+
+import (
+	"testing"
+
+	"github.com/OffchainLabs/prysm/v6/beacon-chain/cache"
+	"github.com/OffchainLabs/prysm/v6/beacon-chain/das"
+	mockExecution "github.com/OffchainLabs/prysm/v6/beacon-chain/execution/testing"
+	forkchoicetypes "github.com/OffchainLabs/prysm/v6/beacon-chain/forkchoice/types"
+	"github.com/OffchainLabs/prysm/v6/consensus-types/blocks"
+	enginev1 "github.com/OffchainLabs/prysm/v6/proto/engine/v1"
+	"github.com/OffchainLabs/prysm/v6/testing/require"
+	"github.com/OffchainLabs/prysm/v6/testing/util"
+	"github.com/OffchainLabs/prysm/v6/testing/util/random"
+)
+
+func Test_getPayloadEnvelopePrestate(t *testing.T) {
+	service, tr := minimalTestService(t)
+	ctx, fcs := tr.ctx, tr.fcs
+
+	gs, _ := util.DeterministicGenesisStateEpbs(t, 32)
+	require.NoError(t, service.saveGenesisData(ctx, gs))
+	require.NoError(t, fcs.UpdateFinalizedCheckpoint(&forkchoicetypes.Checkpoint{Root: service.originBlockRoot}))
+
+	p := random.ExecutionPayloadEnvelope(t)
+	p.BeaconBlockRoot = service.originBlockRoot[:]
+	e, err := blocks.WrappedROExecutionPayloadEnvelope(p)
+	require.NoError(t, err)
+
+	_, err = service.getPayloadEnvelopePrestate(ctx, e)
+	require.NoError(t, err)
+}
+
+func Test_notifyNewEnvelope(t *testing.T) {
+	service, tr := minimalTestService(t, WithPayloadIDCache(cache.NewPayloadIDCache()))
+	ctx, fcs := tr.ctx, tr.fcs
+	gs, _ := util.DeterministicGenesisStateEpbs(t, 32)
+	require.NoError(t, service.saveGenesisData(ctx, gs))
+	require.NoError(t, fcs.UpdateFinalizedCheckpoint(&forkchoicetypes.Checkpoint{Root: service.originBlockRoot}))
+	p := random.ExecutionPayloadEnvelope(t)
+	p.BeaconBlockRoot = service.originBlockRoot[:]
+	e, err := blocks.WrappedROExecutionPayloadEnvelope(p)
+	require.NoError(t, err)
+	engine := &mockExecution.EngineClient{}
+	service.cfg.ExecutionEngineCaller = engine
+	isValidPayload, err := service.notifyNewEnvelope(ctx, e)
+	require.NoError(t, err)
+	require.Equal(t, true, isValidPayload)
+}
+
+func Test_validateExecutionOnEnvelope(t *testing.T) {
+	service, tr := minimalTestService(t, WithPayloadIDCache(cache.NewPayloadIDCache()))
+	ctx, fcs := tr.ctx, tr.fcs
+	gs, _ := util.DeterministicGenesisStateEpbs(t, 32)
+	require.NoError(t, service.saveGenesisData(ctx, gs))
+	require.NoError(t, fcs.UpdateFinalizedCheckpoint(&forkchoicetypes.Checkpoint{Root: service.originBlockRoot}))
+	p := random.ExecutionPayloadEnvelope(t)
+	p.BeaconBlockRoot = service.originBlockRoot[:]
+	e, err := blocks.WrappedROExecutionPayloadEnvelope(p)
+	require.NoError(t, err)
+	engine := &mockExecution.EngineClient{}
+	service.cfg.ExecutionEngineCaller = engine
+	isValidPayload, err := service.validateExecutionOnEnvelope(ctx, e)
+	require.NoError(t, err)
+	require.Equal(t, true, isValidPayload)
+}
+
+func Test_ReceiveExecutionPayloadEnvelope(t *testing.T) {
+	service, tr := minimalTestService(t, WithPayloadIDCache(cache.NewPayloadIDCache()))
+	ctx, fcs := tr.ctx, tr.fcs
+	gs, _ := util.DeterministicGenesisStateEpbs(t, 32)
+	require.NoError(t, service.saveGenesisData(ctx, gs))
+	require.NoError(t, fcs.UpdateFinalizedCheckpoint(&forkchoicetypes.Checkpoint{Root: service.originBlockRoot}))
+	post := gs.Copy()
+	p := &enginev1.ExecutionPayloadEnvelope{
+		Payload: &enginev1.ExecutionPayloadDeneb{
+			ParentHash: make([]byte, 32),
+			BlockHash:  make([]byte, 32),
+		},
+		BeaconBlockRoot:    service.originBlockRoot[:],
+		BlobKzgCommitments: make([][]byte, 0),
+		BeaconStateRoot:    make([]byte, 32),
+		ExecutionRequests:  &enginev1.ExecutionRequests{},
+	}
+	sp := &enginev1.SignedExecutionPayloadEnvelope{
+		Message: p,
+	}
+	e, err := blocks.WrappedROSignedExecutionPayloadEnvelope(sp)
+	require.NoError(t, err)
+	das := &das.MockAvailabilityStore{}
+
+	blockHeader := post.LatestBlockHeader()
+	prevStateRoot, err := post.HashTreeRoot(ctx)
+	require.NoError(t, err)
+	blockHeader.StateRoot = prevStateRoot[:]
+	require.NoError(t, post.SetLatestBlockHeader(blockHeader))
+	stRoot, err := post.HashTreeRoot(ctx)
+	require.NoError(t, err)
+	p.BeaconStateRoot = stRoot[:]
+	engine := &mockExecution.EngineClient{}
+	service.cfg.ExecutionEngineCaller = engine
+	require.NoError(t, service.ReceiveExecutionPayloadEnvelope(ctx, e, das))
+}

beacon-chain/blockchain/receive_payload_attestation_message.go

@@ -0,0 +1,33 @@
+package blockchain
+
+import (
+	"context"
+	"slices"
+
+	"github.com/OffchainLabs/prysm/v6/beacon-chain/core/helpers"
+	"github.com/OffchainLabs/prysm/v6/consensus-types/primitives"
+	eth "github.com/OffchainLabs/prysm/v6/proto/prysm/v1alpha1"
+)
+
+func (s *Service) ReceivePayloadAttestationMessage(ctx context.Context, a *eth.PayloadAttestationMessage) error {
+	if err := helpers.ValidateNilPayloadAttestationMessage(a); err != nil {
+		return err
+	}
+	root := [32]byte(a.Data.BeaconBlockRoot)
+	st, err := s.HeadStateReadOnly(ctx)
+	if err != nil {
+		return err
+	}
+	ptc, err := helpers.GetPayloadTimelinessCommittee(ctx, st, a.Data.Slot)
+	if err != nil {
+		return err
+	}
+	idx := slices.Index(ptc, a.ValidatorIndex)
+	if idx == -1 {
+		return errInvalidValidatorIndex
+	}
+	if s.cfg.PayloadAttestationCache.Seen(root, uint64(primitives.ValidatorIndex(idx))) {
+		return nil
+	}
+	return s.cfg.PayloadAttestationCache.Add(a, uint64(idx))
+}

beacon-chain/blockchain/service.go

@@ -70,6 +70,7 @@ type Service struct {
 	lcStore                        *lightClient.Store
 	startWaitingDataColumnSidecars chan bool // for testing purposes only
 	syncCommitteeHeadState         *cache.SyncCommitteeHeadStateCache
+	payloadBeingSynced             *currentlySyncingPayload
 }
 
 // config options for the service.
@@ -78,6 +79,8 @@ type config struct {
 	ChainStartFetcher       execution.ChainStartFetcher
 	BeaconDB                db.HeadAccessDatabase
 	DepositCache            cache.DepositCache
+	PayloadAttestationCache *cache.PayloadAttestationCache
+	PayloadEnvelopeCache    *sync.Map
 	PayloadIDCache          *cache.PayloadIDCache
 	TrackedValidatorsCache  *cache.TrackedValidatorsCache
 	AttestationCache        *cache.AttestationCache
@@ -190,6 +193,7 @@ func NewService(ctx context.Context, opts ...Option) (*Service, error) {
 		cfg:                    &config{},
 		blockBeingSynced:       &currentlySyncingBlock{roots: make(map[[32]byte]struct{})},
 		syncCommitteeHeadState: cache.NewSyncCommitteeHeadState(),
+		payloadBeingSynced:     &currentlySyncingPayload{roots: make(map[[32]byte]primitives.PTCStatus)},
 	}
 	for _, opt := range opts {
 		if err := opt(srv); err != nil {
@@ -504,7 +508,7 @@ func (s *Service) saveGenesisData(ctx context.Context, genesisState state.Beacon
 // 2.) Check DB.
 // Checking 1.) is ten times faster than checking 2.)
 // this function requires a lock in forkchoice
-func (s *Service) hasBlock(ctx context.Context, root [32]byte) bool {
+func (s *Service) chainHasBlock(ctx context.Context, root [32]byte) bool {
 	if s.cfg.ForkChoiceStore.HasNode(root) {
 		return true
 	}

beacon-chain/blockchain/service_test.go

@@ -379,8 +379,8 @@ func TestHasBlock_ForkChoiceAndDB_DoublyLinkedTree(t *testing.T) {
 	require.NoError(t, err)
 	require.NoError(t, s.cfg.ForkChoiceStore.InsertNode(ctx, beaconState, roblock))
 
-	assert.Equal(t, false, s.hasBlock(ctx, [32]byte{}), "Should not have block")
-	assert.Equal(t, true, s.hasBlock(ctx, r), "Should have block")
+	assert.Equal(t, false, s.chainHasBlock(ctx, [32]byte{}), "Should not have block")
+	assert.Equal(t, true, s.chainHasBlock(ctx, r), "Should have block")
 }
 
 func TestServiceStop_SaveCachedBlocks(t *testing.T) {

beacon-chain/blockchain/testing/BUILD.bazel

@@ -3,7 +3,10 @@ load("@prysm//tools/go:def.bzl", "go_library")
 go_library(
     name = "go_default_library",
     testonly = True,
-    srcs = ["mock.go"],
+    srcs = [
+        "mock.go",
+        "mock_epbs.go",
+    ],
     importpath = "github.com/OffchainLabs/prysm/v6/beacon-chain/blockchain/testing",
     visibility = [
         "//beacon-chain:__subpackages__",

beacon-chain/blockchain/testing/mock.go

@@ -37,47 +37,51 @@ var ErrNilState = errors.New("nil state")
 
 // ChainService defines the mock interface for testing
 type ChainService struct {
-	NotFinalized                bool
-	Optimistic                  bool
-	ValidAttestation            bool
-	ValidatorsRoot              [32]byte
-	PublicKey                   [fieldparams.BLSPubkeyLength]byte
-	FinalizedCheckPoint         *ethpb.Checkpoint
-	CurrentJustifiedCheckPoint  *ethpb.Checkpoint
-	PreviousJustifiedCheckPoint *ethpb.Checkpoint
-	Slot                        *primitives.Slot // Pointer because 0 is a useful value, so checking against it can be incorrect.
-	Balance                     *precompute.Balance
-	CanonicalRoots              map[[32]byte]bool
-	Fork                        *ethpb.Fork
-	ETH1Data                    *ethpb.Eth1Data
-	InitSyncBlockRoots          map[[32]byte]bool
-	DB                          db.Database
-	State                       state.BeaconState
-	HeadStateErr                error
-	Block                       interfaces.ReadOnlySignedBeaconBlock
-	VerifyBlkDescendantErr      error
-	stateNotifier               statefeed.Notifier
-	BlocksReceived              []interfaces.ReadOnlySignedBeaconBlock
-	SyncCommitteeIndices        []primitives.CommitteeIndex
-	blockNotifier               blockfeed.Notifier
-	opNotifier                  opfeed.Notifier
-	Root                        []byte
-	SyncCommitteeDomain         []byte
-	SyncSelectionProofDomain    []byte
-	SyncContributionProofDomain []byte
-	SyncCommitteePubkeys        [][]byte
-	Genesis                     time.Time
-	ForkChoiceStore             forkchoice.ForkChoicer
-	ReceiveBlockMockErr         error
-	OptimisticCheckRootReceived [32]byte
-	FinalizedRoots              map[[32]byte]bool
-	OptimisticRoots             map[[32]byte]bool
-	BlockSlot                   primitives.Slot
-	SyncingRoot                 [32]byte
-	Blobs                       []blocks.VerifiedROBlob
-	DataColumns                 []blocks.VerifiedRODataColumn
-	TargetRoot                  [32]byte
-	MockHeadSlot                *primitives.Slot
+	NotFinalized                        bool
+	Optimistic                          bool
+	ValidAttestation                    bool
+	ValidatorsRoot                      [32]byte
+	PublicKey                           [fieldparams.BLSPubkeyLength]byte
+	FinalizedCheckPoint                 *ethpb.Checkpoint
+	CurrentJustifiedCheckPoint          *ethpb.Checkpoint
+	PreviousJustifiedCheckPoint         *ethpb.Checkpoint
+	Slot                                *primitives.Slot // Pointer because 0 is a useful value, so checking against it can be incorrect.
+	Balance                             *precompute.Balance
+	CanonicalRoots                      map[[32]byte]bool
+	Fork                                *ethpb.Fork
+	ETH1Data                            *ethpb.Eth1Data
+	InitSyncBlockRoots                  map[[32]byte]bool
+	DB                                  db.Database
+	State                               state.BeaconState
+	HeadStateErr                        error
+	Block                               interfaces.ReadOnlySignedBeaconBlock
+	VerifyBlkDescendantErr              error
+	stateNotifier                       statefeed.Notifier
+	BlocksReceived                      []interfaces.ReadOnlySignedBeaconBlock
+	SyncCommitteeIndices                []primitives.CommitteeIndex
+	blockNotifier                       blockfeed.Notifier
+	opNotifier                          opfeed.Notifier
+	Root                                []byte
+	SyncCommitteeDomain                 []byte
+	SyncSelectionProofDomain            []byte
+	SyncContributionProofDomain         []byte
+	SyncCommitteePubkeys                [][]byte
+	Genesis                             time.Time
+	ForkChoiceStore                     forkchoice.ForkChoicer
+	ReceiveBlockMockErr                 error
+	OptimisticCheckRootReceived         [32]byte
+	FinalizedRoots                      map[[32]byte]bool
+	OptimisticRoots                     map[[32]byte]bool
+	BlockSlot                           primitives.Slot
+	SyncingRoot                         [32]byte
+	Blobs                               []blocks.VerifiedROBlob
+	DataColumns                         []blocks.VerifiedRODataColumn
+	TargetRoot                          [32]byte
+	MockHeadSlot                        *primitives.Slot
+	HighestReceivedSlot                 primitives.Slot
+	HighestReceivedRoot                 [32]byte
+	PayloadStatus                       primitives.PTCStatus
+	ReceivePayloadAttestationMessageErr error
 }
 
 func (s *ChainService) Ancestor(ctx context.Context, root []byte, slot primitives.Slot) ([]byte, error) {
@@ -655,12 +659,12 @@ func (s *ChainService) ReceivedBlocksLastEpoch() (uint64, error) {
 	return 0, nil
 }
 
-// HighestReceivedBlockSlot mocks the same method in the chain service
-func (s *ChainService) HighestReceivedBlockSlot() primitives.Slot {
+// HighestReceivedBlockSlotRoot mocks the same method in the chain service
+func (s *ChainService) HighestReceivedBlockSlotRoot() (primitives.Slot, [32]byte) {
 	if s.ForkChoiceStore != nil {
-		return s.ForkChoiceStore.HighestReceivedBlockSlot()
+		return s.ForkChoiceStore.HighestReceivedBlockSlotRoot()
 	}
-	return 0
+	return s.HighestReceivedSlot, s.HighestReceivedRoot
 }
 
 // InsertNode mocks the same method in the chain service
@@ -705,6 +709,11 @@ func (*ChainService) UnrealizedJustifiedPayloadBlockHash() [32]byte {
 	return [32]byte{}
 }
 
+// PayloadBeingSynced mocks the same method in the chain service
+func (c *ChainService) PayloadBeingSynced(root [32]byte) bool {
+	return root == c.SyncingRoot
+}
+
 // BlockBeingSynced mocks the same method in the chain service
 func (c *ChainService) BlockBeingSynced(root [32]byte) bool {
 	return root == c.SyncingRoot
@@ -742,3 +751,21 @@ type MockSyncChecker struct {
 func (m *MockSyncChecker) Synced() bool {
 	return m.synced
 }
+
+// HashInForkchoice mocks the same method in the chain service
+func (c *ChainService) HashInForkchoice([32]byte) bool {
+	return false
+}
+
+// ReceivePayloadAttestationMessage mocks the same method in the chain service
+func (c *ChainService) ReceivePayloadAttestationMessage(_ context.Context, _ *ethpb.PayloadAttestationMessage) error {
+	return c.ReceivePayloadAttestationMessageErr
+}
+
+func (c *ChainService) GetPTCVote(root [32]byte) primitives.PTCStatus {
+	return c.PayloadStatus
+}
+
+func (c *ChainService) HashForBlockRoot(_ context.Context, root [32]byte) ([]byte, error) {
+	return root[:], nil
+}

beacon-chain/blockchain/testing/mock_epbs.go

@@ -0,0 +1,30 @@
+package testing
+
+import (
+	"context"
+
+	"github.com/OffchainLabs/prysm/v6/beacon-chain/das"
+	"github.com/OffchainLabs/prysm/v6/consensus-types/interfaces"
+)
+
+// ReceiveExecutionPayloadEnvelope mocks the  method in chain service.
+func (s *ChainService) ReceiveExecutionPayloadEnvelope(ctx context.Context, env interfaces.ROSignedExecutionPayloadEnvelope, _ das.AvailabilityStore) error {
+	if s.ReceiveBlockMockErr != nil {
+		return s.ReceiveBlockMockErr
+	}
+	if s.State == nil {
+		return ErrNilState
+	}
+	e, err := env.Envelope()
+	if err != nil {
+		return err
+	}
+
+	if s.State.Slot() == e.Slot() {
+		if err := s.State.SetLatestFullSlot(s.State.Slot()); err != nil {
+			return err
+		}
+	}
+	s.ExecutionPayloadEnvelope = e
+	return nil
+}

beacon-chain/cache/BUILD.bazel

@@ -16,11 +16,13 @@ go_library(
         "doc.go",
         "error.go",
         "interfaces.go",
+        "payload_attestation.go",
         "payload_id.go",
         "proposer_indices.go",
         "proposer_indices_disabled.go",  # keep
         "proposer_indices_type.go",
         "registration.go",
+        "signed_execution_header.go",
         "skip_slot_cache.go",
         "subnet_ids.go",
         "sync_committee.go",
@@ -50,6 +52,7 @@ go_library(
         "//encoding/bytesutil:go_default_library",
         "//math:go_default_library",
         "//monitoring/tracing/trace:go_default_library",
+        "//proto/engine/v1:go_default_library",
         "//proto/prysm/v1alpha1:go_default_library",
         "//proto/prysm/v1alpha1/attestation:go_default_library",
         "//runtime/version:go_default_library",
@@ -75,10 +78,12 @@ go_test(
         "checkpoint_state_test.go",
         "committee_fuzz_test.go",
         "committee_test.go",
+        "payload_attestation_test.go",
         "payload_id_test.go",
         "private_access_test.go",
         "proposer_indices_test.go",
         "registration_test.go",
+        "signed_execution_header_test.go",
         "skip_slot_cache_test.go",
         "subnet_ids_test.go",
         "sync_committee_head_state_test.go",
@@ -94,8 +99,10 @@ go_test(
         "//config/fieldparams:go_default_library",
         "//config/params:go_default_library",
         "//consensus-types/primitives:go_default_library",
+        "//crypto/bls:go_default_library",
         "//crypto/bls/blst:go_default_library",
         "//encoding/bytesutil:go_default_library",
+        "//proto/engine/v1:go_default_library",
         "//proto/prysm/v1alpha1:go_default_library",
         "//proto/prysm/v1alpha1/attestation:go_default_library",
         "//testing/assert:go_default_library",

beacon-chain/cache/payload_attestation.go

@@ -0,0 +1,137 @@
+package cache
+
+import (
+	"errors"
+	"fmt"
+	"sync"
+
+	"github.com/OffchainLabs/prysm/v6/consensus-types/primitives"
+	"github.com/OffchainLabs/prysm/v6/crypto/bls"
+	"github.com/OffchainLabs/prysm/v6/encoding/bytesutil"
+	eth "github.com/OffchainLabs/prysm/v6/proto/prysm/v1alpha1"
+)
+
+var errNilPayloadAttestationMessage = errors.New("nil Payload Attestation Message")
+
+// PayloadAttestationCache keeps a map of all the PTC votes that were seen,
+// already aggregated. The key is the beacon block root.
+type PayloadAttestationCache struct {
+	root         [32]byte
+	attestations [primitives.PAYLOAD_INVALID_STATUS]*eth.PayloadAttestation
+	sync.Mutex
+}
+
+// Seen returns true if a vote for the given Beacon Block Root has already been processed
+// for this Payload Timeliness Committee index. This will return true even if
+// the Payload status differs.
+func (p *PayloadAttestationCache) Seen(root [32]byte, idx uint64) bool {
+	p.Lock()
+	defer p.Unlock()
+	if p.root != root {
+		return false
+	}
+	for _, agg := range p.attestations {
+		if agg == nil {
+			continue
+		}
+		if agg.AggregationBits.BitAt(idx) {
+			return true
+		}
+	}
+	return false
+}
+
+// messageToPayloadAttestation creates a PayloadAttestation with a single
+// aggregated bit from the passed PayloadAttestationMessage
+func messageToPayloadAttestation(att *eth.PayloadAttestationMessage, idx uint64) *eth.PayloadAttestation {
+	bits := primitives.NewPayloadAttestationAggregationBits()
+	bits.SetBitAt(idx, true)
+	data := &eth.PayloadAttestationData{
+		BeaconBlockRoot: bytesutil.SafeCopyBytes(att.Data.BeaconBlockRoot),
+		Slot:            att.Data.Slot,
+		PayloadStatus:   att.Data.PayloadStatus,
+	}
+	return &eth.PayloadAttestation{
+		AggregationBits: bits,
+		Data:            data,
+		Signature:       bytesutil.SafeCopyBytes(att.Signature),
+	}
+}
+
+// aggregateSigFromMessage returns the aggregated signature from a Payload
+// Attestation by adding the passed signature in the PayloadAttestationMessage,
+// no signature validation is performed.
+func aggregateSigFromMessage(aggregated *eth.PayloadAttestation, message *eth.PayloadAttestationMessage) ([]byte, error) {
+	aggSig, err := bls.SignatureFromBytesNoValidation(aggregated.Signature)
+	if err != nil {
+		return nil, err
+	}
+	sig, err := bls.SignatureFromBytesNoValidation(message.Signature)
+	if err != nil {
+		return nil, err
+	}
+	return bls.AggregateSignatures([]bls.Signature{aggSig, sig}).Marshal(), nil
+}
+
+// Add adds a PayloadAttestationMessage to the internal cache of aggregated
+// PayloadAttestations.
+// If the index has already been seen for this attestation status the function does nothing.
+// If the root is not the cached root, the function will clear the previous cache
+// This function assumes that the message has already been validated. In
+// particular that the signature is valid and that the block root corresponds to
+// the given slot in the attestation data.
+func (p *PayloadAttestationCache) Add(att *eth.PayloadAttestationMessage, idx uint64) error {
+	if att == nil || att.Data == nil || att.Data.BeaconBlockRoot == nil {
+		return errNilPayloadAttestationMessage
+	}
+	p.Lock()
+	defer p.Unlock()
+	root := [32]byte(att.Data.BeaconBlockRoot)
+	if p.root != root {
+		p.root = root
+		p.attestations = [primitives.PAYLOAD_INVALID_STATUS]*eth.PayloadAttestation{}
+	}
+	if len(att.Data.PayloadStatus) != 1 {
+		return fmt.Errorf("expected payload status length 1, got %d", len(att.Data.PayloadStatus))
+	}
+	status := uint64(att.Data.PayloadStatus[0])
+	agg := p.attestations[status]
+	if agg == nil {
+		p.attestations[status] = messageToPayloadAttestation(att, idx)
+		return nil
+	}
+	if agg.AggregationBits.BitAt(idx) {
+		return nil
+	}
+	sig, err := aggregateSigFromMessage(agg, att)
+	if err != nil {
+		return err
+	}
+	agg.Signature = sig
+	agg.AggregationBits.SetBitAt(idx, true)
+	return nil
+}
+
+// Get returns the aggregated PayloadAttestation for the given root and status
+// if the root doesn't exist or status is invalid, the function returns nil.
+func (p *PayloadAttestationCache) Get(root [32]byte, status primitives.PTCStatus) *eth.PayloadAttestation {
+	p.Lock()
+	defer p.Unlock()
+
+	if p.root != root {
+		return nil
+	}
+	if status >= primitives.PAYLOAD_INVALID_STATUS {
+		return nil
+	}
+
+	return eth.CopyPayloadAttestation(p.attestations[status])
+}
+
+// Clear clears the internal map
+func (p *PayloadAttestationCache) Clear() {
+	p.Lock()
+	defer p.Unlock()
+	p.root = [32]byte{}
+	p.attestations = [primitives.PAYLOAD_INVALID_STATUS]*eth.PayloadAttestation{}
+}

beacon-chain/cache/payload_attestation_test.go

@@ -0,0 +1,143 @@
+package cache
+
+import (
+	"testing"
+
+	"github.com/OffchainLabs/prysm/v6/consensus-types/primitives"
+	"github.com/OffchainLabs/prysm/v6/crypto/bls"
+	"github.com/OffchainLabs/prysm/v6/encoding/bytesutil"
+	eth "github.com/OffchainLabs/prysm/v6/proto/prysm/v1alpha1"
+	"github.com/OffchainLabs/prysm/v6/testing/require"
+)
+
+func TestPayloadAttestationCache(t *testing.T) {
+	p := &PayloadAttestationCache{}
+
+	//Test Has seen
+	root := [32]byte{'r'}
+	idx := uint64(5)
+	require.Equal(t, false, p.Seen(root, idx))
+
+	// Test Add
+	msg := &eth.PayloadAttestationMessage{
+		Signature: bls.NewAggregateSignature().Marshal(),
+		Data: &eth.PayloadAttestationData{
+			BeaconBlockRoot: root[:],
+			Slot:            1,
+			PayloadStatus:   primitives.PAYLOAD_PRESENT,
+		},
+	}
+
+	// Add new root
+	require.NoError(t, p.Add(msg, idx))
+	require.Equal(t, true, p.Seen(root, idx))
+	require.Equal(t, root, p.root)
+	att := p.attestations[primitives.PAYLOAD_PRESENT]
+	indices := att.AggregationBits.BitIndices()
+	require.DeepEqual(t, []int{int(idx)}, indices)
+	singleSig := bytesutil.SafeCopyBytes(msg.Signature)
+	require.DeepEqual(t, singleSig, att.Signature)
+
+	// Test Seen
+	require.Equal(t, true, p.Seen(root, idx))
+	require.Equal(t, false, p.Seen(root, idx+1))
+
+	// Add another attestation on the same data
+	msg2 := &eth.PayloadAttestationMessage{
+		Signature: bls.NewAggregateSignature().Marshal(),
+		Data:      att.Data,
+	}
+	idx2 := uint64(7)
+	require.NoError(t, p.Add(msg2, idx2))
+	att = p.attestations[primitives.PAYLOAD_PRESENT]
+	indices = att.AggregationBits.BitIndices()
+	require.DeepEqual(t, []int{int(idx), int(idx2)}, indices)
+	require.DeepNotEqual(t, att.Signature, msg.Signature)
+
+	// Try again the same index
+	require.NoError(t, p.Add(msg2, idx2))
+	att2 := p.attestations[primitives.PAYLOAD_PRESENT]
+	indices = att.AggregationBits.BitIndices()
+	require.DeepEqual(t, []int{int(idx), int(idx2)}, indices)
+	require.DeepEqual(t, att, att2)
+
+	// Test Seen
+	require.Equal(t, true, p.Seen(root, idx2))
+	require.Equal(t, false, p.Seen(root, idx2+1))
+
+	// Add another payload status for a different payload status
+	msg3 := &eth.PayloadAttestationMessage{
+		Signature: bls.NewAggregateSignature().Marshal(),
+		Data: &eth.PayloadAttestationData{
+			BeaconBlockRoot: root[:],
+			Slot:            1,
+			PayloadStatus:   primitives.PAYLOAD_WITHHELD,
+		},
+	}
+	idx3 := uint64(17)
+
+	require.NoError(t, p.Add(msg3, idx3))
+	att3 := p.attestations[primitives.PAYLOAD_WITHHELD]
+	indices3 := att3.AggregationBits.BitIndices()
+	require.DeepEqual(t, []int{int(idx3)}, indices3)
+	require.DeepEqual(t, singleSig, att3.Signature)
+
+	// Add a different root
+	root2 := [32]byte{'s'}
+	msg.Data.BeaconBlockRoot = root2[:]
+	require.NoError(t, p.Add(msg, idx))
+	require.Equal(t, root2, p.root)
+	require.Equal(t, true, p.Seen(root2, idx))
+	require.Equal(t, false, p.Seen(root, idx))
+	att = p.attestations[primitives.PAYLOAD_PRESENT]
+	indices = att.AggregationBits.BitIndices()
+	require.DeepEqual(t, []int{int(idx)}, indices)
+}
+
+func TestPayloadAttestationCache_Get(t *testing.T) {
+	root := [32]byte{1, 2, 3}
+	wrongRoot := [32]byte{4, 5, 6}
+	status := primitives.PAYLOAD_PRESENT
+	invalidStatus := primitives.PAYLOAD_INVALID_STATUS
+
+	cache := &PayloadAttestationCache{
+		root: root,
+		attestations: [primitives.PAYLOAD_INVALID_STATUS]*eth.PayloadAttestation{
+			{
+				Signature: []byte{1},
+			},
+			{
+				Signature: []byte{2},
+			},
+			{
+				Signature: []byte{3},
+			},
+		},
+	}
+
+	t.Run("valid root and status", func(t *testing.T) {
+		result := cache.Get(root, status)
+		require.NotNil(t, result, "Expected a non-nil result")
+		require.DeepEqual(t, cache.attestations[status], result)
+	})
+
+	t.Run("invalid root", func(t *testing.T) {
+		result := cache.Get(wrongRoot, status)
+		require.IsNil(t, result)
+	})
+
+	t.Run("status out of bound", func(t *testing.T) {
+		result := cache.Get(root, invalidStatus)
+		require.IsNil(t, result)
+	})
+
+	t.Run("no attestation", func(t *testing.T) {
+		emptyCache := &PayloadAttestationCache{
+			root:         root,
+			attestations: [primitives.PAYLOAD_INVALID_STATUS]*eth.PayloadAttestation{},
+		}
+
+		result := emptyCache.Get(root, status)
+		require.IsNil(t, result)
+	})
+}

beacon-chain/cache/signed_execution_header.go

@@ -0,0 +1,76 @@
+package cache
+
+import (
+	"bytes"
+	"sync"
+
+	"github.com/OffchainLabs/prysm/v6/consensus-types/primitives"
+	enginev1 "github.com/OffchainLabs/prysm/v6/proto/engine/v1"
+)
+
+// ExecutionPayloadHeaders is used  by the sync service to store signed execution payload headers after they pass validation,
+// and filter out subsequent headers with lower value.
+// The signed header from this cache could be used by the proposer when proposing the next slot.
+type ExecutionPayloadHeaders struct {
+	headers map[primitives.Slot][]*enginev1.SignedExecutionPayloadHeader
+	sync.RWMutex
+}
+
+func NewExecutionPayloadHeaders() *ExecutionPayloadHeaders {
+	return &ExecutionPayloadHeaders{
+		headers: make(map[primitives.Slot][]*enginev1.SignedExecutionPayloadHeader),
+	}
+}
+
+// SaveSignedExecutionPayloadHeader saves the signed execution payload header to the cache.
+// The cache stores headers for up to two slots. If the input slot is higher than the lowest slot
+// currently in the cache, the lowest slot is removed to make space for the new header.
+// Only the highest value header for a given parent block hash will be stored.
+// This function assumes caller already checks header's slot is current or next slot, it doesn't account for slot validation.
+func (c *ExecutionPayloadHeaders) SaveSignedExecutionPayloadHeader(header *enginev1.SignedExecutionPayloadHeader) {
+	c.Lock()
+	defer c.Unlock()
+
+	for s := range c.headers {
+		if s+1 < header.Message.Slot {
+			delete(c.headers, s)
+		}
+	}
+
+	// Add or update the header in the map
+	if _, ok := c.headers[header.Message.Slot]; !ok {
+		c.headers[header.Message.Slot] = []*enginev1.SignedExecutionPayloadHeader{header}
+	} else {
+		found := false
+		for i, h := range c.headers[header.Message.Slot] {
+			if bytes.Equal(h.Message.ParentBlockHash, header.Message.ParentBlockHash) && bytes.Equal(h.Message.ParentBlockRoot, header.Message.ParentBlockRoot) {
+				if header.Message.Value > h.Message.Value {
+					c.headers[header.Message.Slot][i] = header
+				}
+				found = true
+				break
+			}
+		}
+		if !found {
+			c.headers[header.Message.Slot] = append(c.headers[header.Message.Slot], header)
+		}
+	}
+}
+
+// SignedExecutionPayloadHeader returns the signed payload header for the given slot and parent block hash and block root.
+// Returns nil if the header is not found.
+// This should be used when the caller wants the header to match parent block hash and parent block root such as proposer choosing a header to propose.
+func (c *ExecutionPayloadHeaders) SignedExecutionPayloadHeader(slot primitives.Slot, parentBlockHash []byte, parentBlockRoot []byte) *enginev1.SignedExecutionPayloadHeader {
+	c.RLock()
+	defer c.RUnlock()
+
+	if headers, ok := c.headers[slot]; ok {
+		for _, header := range headers {
+			if bytes.Equal(header.Message.ParentBlockHash, parentBlockHash) && bytes.Equal(header.Message.ParentBlockRoot, parentBlockRoot) {
+				return header
+			}
+		}
+	}
+
+	return nil
+}

beacon-chain/cache/signed_execution_header_test.go

@@ -0,0 +1,243 @@
+package cache
+
+import (
+	"testing"
+
+	enginev1 "github.com/OffchainLabs/prysm/v6/proto/engine/v1"
+	"github.com/OffchainLabs/prysm/v6/testing/require"
+)
+
+func Test_SaveSignedExecutionPayloadHeader(t *testing.T) {
+	t.Run("First header should be added to cache", func(t *testing.T) {
+		c := NewExecutionPayloadHeaders()
+		header := &enginev1.SignedExecutionPayloadHeader{
+			Message: &enginev1.ExecutionPayloadHeaderEPBS{
+				Slot:            1,
+				ParentBlockHash: []byte("parent1"),
+				Value:           100,
+			},
+		}
+		c.SaveSignedExecutionPayloadHeader(header)
+		require.Equal(t, 1, len(c.headers))
+		require.Equal(t, header, c.headers[1][0])
+	})
+
+	t.Run("Second header with higher slot should be added, and both slots should be in cache", func(t *testing.T) {
+		c := NewExecutionPayloadHeaders()
+		header1 := &enginev1.SignedExecutionPayloadHeader{
+			Message: &enginev1.ExecutionPayloadHeaderEPBS{
+				Slot:            1,
+				ParentBlockHash: []byte("parent1"),
+				Value:           100,
+			},
+		}
+		header2 := &enginev1.SignedExecutionPayloadHeader{
+			Message: &enginev1.ExecutionPayloadHeaderEPBS{
+				Slot:            2,
+				ParentBlockHash: []byte("parent2"),
+				Value:           100,
+			},
+		}
+		c.SaveSignedExecutionPayloadHeader(header1)
+		c.SaveSignedExecutionPayloadHeader(header2)
+		require.Equal(t, 2, len(c.headers))
+		require.Equal(t, header1, c.headers[1][0])
+		require.Equal(t, header2, c.headers[2][0])
+	})
+
+	t.Run("Third header with higher slot should replace the oldest slot", func(t *testing.T) {
+		c := NewExecutionPayloadHeaders()
+		header1 := &enginev1.SignedExecutionPayloadHeader{
+			Message: &enginev1.ExecutionPayloadHeaderEPBS{
+				Slot:            1,
+				ParentBlockHash: []byte("parent1"),
+				Value:           100,
+			},
+		}
+		header2 := &enginev1.SignedExecutionPayloadHeader{
+			Message: &enginev1.ExecutionPayloadHeaderEPBS{
+				Slot:            2,
+				ParentBlockHash: []byte("parent2"),
+				Value:           100,
+			},
+		}
+		header3 := &enginev1.SignedExecutionPayloadHeader{
+			Message: &enginev1.ExecutionPayloadHeaderEPBS{
+				Slot:            3,
+				ParentBlockHash: []byte("parent3"),
+				Value:           100,
+			},
+		}
+		c.SaveSignedExecutionPayloadHeader(header1)
+		c.SaveSignedExecutionPayloadHeader(header2)
+		c.SaveSignedExecutionPayloadHeader(header3)
+		require.Equal(t, 2, len(c.headers))
+		require.Equal(t, header2, c.headers[2][0])
+		require.Equal(t, header3, c.headers[3][0])
+	})
+
+	t.Run("Header with same slot but higher value should replace the existing one", func(t *testing.T) {
+		c := NewExecutionPayloadHeaders()
+		header1 := &enginev1.SignedExecutionPayloadHeader{
+			Message: &enginev1.ExecutionPayloadHeaderEPBS{
+				Slot:            2,
+				ParentBlockHash: []byte("parent2"),
+				Value:           100,
+			},
+		}
+		header2 := &enginev1.SignedExecutionPayloadHeader{
+			Message: &enginev1.ExecutionPayloadHeaderEPBS{
+				Slot:            2,
+				ParentBlockHash: []byte("parent2"),
+				Value:           200,
+			},
+		}
+		c.SaveSignedExecutionPayloadHeader(header1)
+		c.SaveSignedExecutionPayloadHeader(header2)
+		require.Equal(t, 1, len(c.headers[2]))
+		require.Equal(t, header2, c.headers[2][0])
+	})
+
+	t.Run("Header with different parent block hash should be appended to the same slot", func(t *testing.T) {
+		c := NewExecutionPayloadHeaders()
+		header1 := &enginev1.SignedExecutionPayloadHeader{
+			Message: &enginev1.ExecutionPayloadHeaderEPBS{
+				Slot:            2,
+				ParentBlockHash: []byte("parent1"),
+				Value:           100,
+			},
+		}
+		header2 := &enginev1.SignedExecutionPayloadHeader{
+			Message: &enginev1.ExecutionPayloadHeaderEPBS{
+				Slot:            2,
+				ParentBlockHash: []byte("parent2"),
+				Value:           200,
+			},
+		}
+		c.SaveSignedExecutionPayloadHeader(header1)
+		c.SaveSignedExecutionPayloadHeader(header2)
+		require.Equal(t, 2, len(c.headers[2]))
+		require.Equal(t, header1, c.headers[2][0])
+		require.Equal(t, header2, c.headers[2][1])
+	})
+}
+
+func TestSignedExecutionPayloadHeader(t *testing.T) {
+	t.Run("Return header when slot and parentBlockHash match", func(t *testing.T) {
+		c := NewExecutionPayloadHeaders()
+		header := &enginev1.SignedExecutionPayloadHeader{
+			Message: &enginev1.ExecutionPayloadHeaderEPBS{
+				Slot:            1,
+				ParentBlockHash: []byte("parent1"),
+				ParentBlockRoot: []byte("root1"),
+				Value:           100,
+			},
+		}
+		c.SaveSignedExecutionPayloadHeader(header)
+		result := c.SignedExecutionPayloadHeader(1, []byte("parent1"), []byte("root1"))
+		require.NotNil(t, result)
+		require.Equal(t, header, result)
+	})
+
+	t.Run("Return nil when no matching slot and parentBlockHash", func(t *testing.T) {
+		c := NewExecutionPayloadHeaders()
+		header := &enginev1.SignedExecutionPayloadHeader{
+			Message: &enginev1.ExecutionPayloadHeaderEPBS{
+				Slot:            1,
+				ParentBlockHash: []byte("parent1"),
+				ParentBlockRoot: []byte("root1"),
+				Value:           100,
+			},
+		}
+		c.SaveSignedExecutionPayloadHeader(header)
+		result := c.SignedExecutionPayloadHeader(2, []byte("parent2"), []byte("root1"))
+		require.IsNil(t, result)
+	})
+
+	t.Run("Return nil when no matching slot and parentBlockRoot", func(t *testing.T) {
+		c := NewExecutionPayloadHeaders()
+		header := &enginev1.SignedExecutionPayloadHeader{
+			Message: &enginev1.ExecutionPayloadHeaderEPBS{
+				Slot:            1,
+				ParentBlockHash: []byte("parent1"),
+				ParentBlockRoot: []byte("root1"),
+				Value:           100,
+			},
+		}
+		c.SaveSignedExecutionPayloadHeader(header)
+		result := c.SignedExecutionPayloadHeader(2, []byte("parent1"), []byte("root2"))
+		require.IsNil(t, result)
+	})
+
+	t.Run("Return header when there are two slots in the cache and a match is found", func(t *testing.T) {
+		c := NewExecutionPayloadHeaders()
+		header1 := &enginev1.SignedExecutionPayloadHeader{
+			Message: &enginev1.ExecutionPayloadHeaderEPBS{
+				Slot:            1,
+				ParentBlockHash: []byte("parent1"),
+				Value:           100,
+			},
+		}
+		header2 := &enginev1.SignedExecutionPayloadHeader{
+			Message: &enginev1.ExecutionPayloadHeaderEPBS{
+				Slot:            2,
+				ParentBlockHash: []byte("parent2"),
+				Value:           200,
+			},
+		}
+		c.SaveSignedExecutionPayloadHeader(header1)
+		c.SaveSignedExecutionPayloadHeader(header2)
+
+		// Check for the first header
+		result1 := c.SignedExecutionPayloadHeader(1, []byte("parent1"), []byte{})
+		require.NotNil(t, result1)
+		require.Equal(t, header1, result1)
+
+		// Check for the second header
+		result2 := c.SignedExecutionPayloadHeader(2, []byte("parent2"), []byte{})
+		require.NotNil(t, result2)
+		require.Equal(t, header2, result2)
+	})
+
+	t.Run("Return nil when slot is evicted from cache", func(t *testing.T) {
+		c := NewExecutionPayloadHeaders()
+		header1 := &enginev1.SignedExecutionPayloadHeader{
+			Message: &enginev1.ExecutionPayloadHeaderEPBS{
+				Slot:            1,
+				ParentBlockHash: []byte("parent1"),
+				Value:           100,
+			},
+		}
+		header2 := &enginev1.SignedExecutionPayloadHeader{
+			Message: &enginev1.ExecutionPayloadHeaderEPBS{
+				Slot:            2,
+				ParentBlockHash: []byte("parent2"),
+				Value:           200,
+			},
+		}
+		header3 := &enginev1.SignedExecutionPayloadHeader{
+			Message: &enginev1.ExecutionPayloadHeaderEPBS{
+				Slot:            3,
+				ParentBlockHash: []byte("parent3"),
+				Value:           300,
+			},
+		}
+		c.SaveSignedExecutionPayloadHeader(header1)
+		c.SaveSignedExecutionPayloadHeader(header2)
+		c.SaveSignedExecutionPayloadHeader(header3)
+
+		// The first slot should be evicted, so result should be nil
+		result := c.SignedExecutionPayloadHeader(1, []byte("parent1"), []byte{})
+		require.IsNil(t, result)
+
+		// The second slot should still be present
+		result = c.SignedExecutionPayloadHeader(2, []byte("parent2"), []byte{})
+		require.NotNil(t, result)
+		require.Equal(t, header2, result)
+
+		// The third slot should be present
+		result = c.SignedExecutionPayloadHeader(3, []byte("parent3"), []byte{})
+		require.NotNil(t, result)
+		require.Equal(t, header3, result)
+	})
+}

beacon-chain/core/blocks/genesis.go

@@ -11,6 +11,7 @@ import (
 	"github.com/OffchainLabs/prysm/v6/consensus-types/blocks"
 	"github.com/OffchainLabs/prysm/v6/consensus-types/interfaces"
 	"github.com/OffchainLabs/prysm/v6/encoding/bytesutil"
+	"github.com/OffchainLabs/prysm/v6/encoding/ssz"
 	enginev1 "github.com/OffchainLabs/prysm/v6/proto/engine/v1"
 	ethpb "github.com/OffchainLabs/prysm/v6/proto/prysm/v1alpha1"
 	"github.com/pkg/errors"
@@ -222,6 +223,42 @@ func NewGenesisBlockForState(ctx context.Context, st state.BeaconState) (interfa
 			},
 			Signature: params.BeaconConfig().EmptySignature[:],
 		})
+	case *ethpb.BeaconStateEPBS:
+		kzgs := make([][]byte, 0)
+		kzgRoot, err := ssz.KzgCommitmentsRoot(kzgs)
+		if err != nil {
+			return nil, err
+		}
+		return blocks.NewSignedBeaconBlock(&ethpb.SignedBeaconBlockEpbs{
+			Block: &ethpb.BeaconBlockEpbs{
+				ParentRoot: params.BeaconConfig().ZeroHash[:],
+				StateRoot:  root[:],
+				Body: &ethpb.BeaconBlockBodyEpbs{
+					RandaoReveal: make([]byte, 96),
+					Eth1Data: &ethpb.Eth1Data{
+						DepositRoot: make([]byte, 32),
+						BlockHash:   make([]byte, 32),
+					},
+					Graffiti: make([]byte, 32),
+					SyncAggregate: &ethpb.SyncAggregate{
+						SyncCommitteeBits:      make([]byte, fieldparams.SyncCommitteeLength/8),
+						SyncCommitteeSignature: make([]byte, fieldparams.BLSSignatureLength),
+					},
+					SignedExecutionPayloadHeader: &enginev1.SignedExecutionPayloadHeader{
+						Message: &enginev1.ExecutionPayloadHeaderEPBS{
+							ParentBlockHash:        make([]byte, 32),
+							ParentBlockRoot:        make([]byte, 32),
+							BlockHash:              make([]byte, 32),
+							BlobKzgCommitmentsRoot: kzgRoot[:],
+						},
+						Signature: make([]byte, 96),
+					},
+					BlsToExecutionChanges: make([]*ethpb.SignedBLSToExecutionChange, 0),
+					PayloadAttestations:   make([]*ethpb.PayloadAttestation, 0),
+				},
+			},
+			Signature: params.BeaconConfig().EmptySignature[:],
+		})
 	default:
 		return nil, ErrUnrecognizedState
 	}

beacon-chain/core/blocks/payload.go

@@ -58,6 +58,9 @@ func IsMergeTransitionComplete(st state.BeaconState) (bool, error) {
 //
 //	return block.body.execution_payload != ExecutionPayload()
 func IsExecutionBlock(body interfaces.ReadOnlyBeaconBlockBody) (bool, error) {
+	if body.Version() >= version.Capella {
+		return true, nil
+	}
 	if body == nil {
 		return false, errors.New("nil block body")
 	}
@@ -93,6 +96,9 @@ func IsExecutionEnabled(st state.BeaconState, body interfaces.ReadOnlyBeaconBloc
 	if IsPreBellatrixVersion(st.Version()) {
 		return false, nil
 	}
+	if body.Version() >= version.Capella {
+		return true, nil
+	}
 	header, err := st.LatestExecutionPayloadHeader()
 	if err != nil {
 		return false, err

beacon-chain/core/blocks/withdrawals.go

@@ -13,8 +13,8 @@ import (
 	"github.com/OffchainLabs/prysm/v6/consensus-types/primitives"
 	"github.com/OffchainLabs/prysm/v6/crypto/bls"
 	"github.com/OffchainLabs/prysm/v6/crypto/hash"
-	"github.com/OffchainLabs/prysm/v6/encoding/bytesutil"
 	"github.com/OffchainLabs/prysm/v6/encoding/ssz"
+	enginev1 "github.com/OffchainLabs/prysm/v6/proto/engine/v1"
 	ethpb "github.com/OffchainLabs/prysm/v6/proto/prysm/v1alpha1"
 	"github.com/OffchainLabs/prysm/v6/runtime/version"
 	"github.com/pkg/errors"
@@ -118,14 +118,97 @@ func ValidateBLSToExecutionChange(st state.ReadOnlyBeaconState, signed *ethpb.Si
 	return val, nil
 }
 
+func checkWithdrawalsAgainstPayload(
+	executionData interfaces.ExecutionData,
+	numExpected int,
+	expectedRoot [32]byte,
+) error {
+	var wdRoot [32]byte
+	if executionData.IsBlinded() {
+		r, err := executionData.WithdrawalsRoot()
+		if err != nil {
+			return errors.Wrap(err, "could not get withdrawals root")
+		}
+		copy(wdRoot[:], r)
+	} else {
+		wds, err := executionData.Withdrawals()
+		if err != nil {
+			return errors.Wrap(err, "could not get withdrawals")
+		}
+
+		if len(wds) != numExpected {
+			return fmt.Errorf("execution payload header has %d withdrawals when %d were expected", len(wds), numExpected)
+		}
+
+		wdRoot, err = ssz.WithdrawalSliceRoot(wds, fieldparams.MaxWithdrawalsPerPayload)
+		if err != nil {
+			return errors.Wrap(err, "could not get withdrawals root")
+		}
+	}
+	if expectedRoot != wdRoot {
+		return fmt.Errorf("expected withdrawals root %#x, got %#x", expectedRoot, wdRoot)
+	}
+	return nil
+}
+
+func processWithdrawalStateTransition(
+	st state.BeaconState,
+	expectedWithdrawals []*enginev1.Withdrawal,
+	partialWithdrawalsCount uint64,
+) (err error) {
+	for _, withdrawal := range expectedWithdrawals {
+		err := helpers.DecreaseBalance(st, withdrawal.ValidatorIndex, withdrawal.Amount)
+		if err != nil {
+			return errors.Wrap(err, "could not decrease balance")
+		}
+	}
+	if st.Version() >= version.Electra {
+		if err := st.DequeuePendingPartialWithdrawals(partialWithdrawalsCount); err != nil {
+			return fmt.Errorf("unable to dequeue partial withdrawals from state: %w", err)
+		}
+	}
+
+	if len(expectedWithdrawals) > 0 {
+		if err := st.SetNextWithdrawalIndex(expectedWithdrawals[len(expectedWithdrawals)-1].Index + 1); err != nil {
+			return errors.Wrap(err, "could not set next withdrawal index")
+		}
+	}
+	var nextValidatorIndex primitives.ValidatorIndex
+	if uint64(len(expectedWithdrawals)) < params.BeaconConfig().MaxWithdrawalsPerPayload {
+		nextValidatorIndex, err = st.NextWithdrawalValidatorIndex()
+		if err != nil {
+			return errors.Wrap(err, "could not get next withdrawal validator index")
+		}
+		nextValidatorIndex += primitives.ValidatorIndex(params.BeaconConfig().MaxValidatorsPerWithdrawalsSweep)
+		nextValidatorIndex = nextValidatorIndex % primitives.ValidatorIndex(st.NumValidators())
+	} else {
+		nextValidatorIndex = expectedWithdrawals[len(expectedWithdrawals)-1].ValidatorIndex + 1
+		if nextValidatorIndex == primitives.ValidatorIndex(st.NumValidators()) {
+			nextValidatorIndex = 0
+		}
+	}
+	if err := st.SetNextWithdrawalValidatorIndex(nextValidatorIndex); err != nil {
+		return errors.Wrap(err, "could not set next withdrawal validator index")
+	}
+	return nil
+}
+
 // ProcessWithdrawals processes the validator withdrawals from the provided execution payload
 // into the beacon state.
 //
 // Spec pseudocode definition:
 //
-// def process_withdrawals(state: BeaconState, payload: ExecutionPayload) -> None:
+//	def process_withdrawals(state: BeaconState, payload: ExecutionPayload) -> None:
+//		if state.fork.current_version >= EIP7732_FORK_VERSION :
+//			if not is_parent_block_full(state): # [New in EIP-7732]
+//		 		return
 //
-//	expected_withdrawals, processed_partial_withdrawals_count = get_expected_withdrawals(state) # [Modified in Electra:EIP7251]
+//	    expected_withdrawals, partial_withdrawals_count = get_expected_withdrawals(state)  # [Modified in Electra:EIP7251]
+//
+//		if state.fork.current_version >= EIP7732_FORK_VERSION :
+//			state.latest_withdrawals_root = hash_tree_root(expected_withdrawals) # [New in EIP-7732]
+//		else :
+//	    	assert len(payload.withdrawals) == len(expected_withdrawals)
 //
 //	assert len(payload.withdrawals) == len(expected_withdrawals)
 //
@@ -152,76 +235,39 @@ func ValidateBLSToExecutionChange(st state.ReadOnlyBeaconState, signed *ethpb.Si
 //	    next_validator_index = ValidatorIndex(next_index % len(state.validators))
 //	    state.next_withdrawal_validator_index = next_validator_index
 func ProcessWithdrawals(st state.BeaconState, executionData interfaces.ExecutionData) (state.BeaconState, error) {
-	expectedWithdrawals, processedPartialWithdrawalsCount, err := st.ExpectedWithdrawals()
-	if err != nil {
-		return nil, errors.Wrap(err, "could not get expected withdrawals")
+	if st.Version() >= version.EPBS {
+		IsParentBlockFull, err := st.IsParentBlockFull()
+		if err != nil {
+			return nil, errors.Wrap(err, "could not check if parent block is full")
+		}
+
+		if !IsParentBlockFull {
+			return st, nil
+		}
 	}
 
-	var wdRoot [32]byte
-	if executionData.IsBlinded() {
-		r, err := executionData.WithdrawalsRoot()
-		if err != nil {
-			return nil, errors.Wrap(err, "could not get withdrawals root")
-		}
-		wdRoot = bytesutil.ToBytes32(r)
-	} else {
-		wds, err := executionData.Withdrawals()
-		if err != nil {
-			return nil, errors.Wrap(err, "could not get withdrawals")
-		}
-
-		if len(wds) != len(expectedWithdrawals) {
-			return nil, fmt.Errorf("execution payload header has %d withdrawals when %d were expected", len(wds), len(expectedWithdrawals))
-		}
-
-		wdRoot, err = ssz.WithdrawalSliceRoot(wds, fieldparams.MaxWithdrawalsPerPayload)
-		if err != nil {
-			return nil, errors.Wrap(err, "could not get withdrawals root")
-		}
+	expectedWithdrawals, partialWithdrawalsCount, err := st.ExpectedWithdrawals()
+	if err != nil {
+		return nil, errors.Wrap(err, "could not get expected withdrawals")
 	}
 
 	expectedRoot, err := ssz.WithdrawalSliceRoot(expectedWithdrawals, fieldparams.MaxWithdrawalsPerPayload)
 	if err != nil {
 		return nil, errors.Wrap(err, "could not get expected withdrawals root")
 	}
-	if expectedRoot != wdRoot {
-		return nil, fmt.Errorf("expected withdrawals root %#x, got %#x", expectedRoot, wdRoot)
-	}
 
-	for _, withdrawal := range expectedWithdrawals {
-		err := helpers.DecreaseBalance(st, withdrawal.ValidatorIndex, withdrawal.Amount)
+	if st.Version() >= version.EPBS {
+		err = st.SetLastWithdrawalsRoot(expectedRoot[:])
 		if err != nil {
-			return nil, errors.Wrap(err, "could not decrease balance")
+			return nil, errors.Wrap(err, "could not set withdrawals root")
 		}
-	}
-
-	if st.Version() >= version.Electra {
-		if err := st.DequeuePendingPartialWithdrawals(processedPartialWithdrawalsCount); err != nil {
-			return nil, fmt.Errorf("unable to dequeue partial withdrawals from state: %w", err)
-		}
-	}
-
-	if len(expectedWithdrawals) > 0 {
-		if err := st.SetNextWithdrawalIndex(expectedWithdrawals[len(expectedWithdrawals)-1].Index + 1); err != nil {
-			return nil, errors.Wrap(err, "could not set next withdrawal index")
-		}
-	}
-	var nextValidatorIndex primitives.ValidatorIndex
-	if uint64(len(expectedWithdrawals)) < params.BeaconConfig().MaxWithdrawalsPerPayload {
-		nextValidatorIndex, err = st.NextWithdrawalValidatorIndex()
-		if err != nil {
-			return nil, errors.Wrap(err, "could not get next withdrawal validator index")
-		}
-		nextValidatorIndex += primitives.ValidatorIndex(params.BeaconConfig().MaxValidatorsPerWithdrawalsSweep)
-		nextValidatorIndex = nextValidatorIndex % primitives.ValidatorIndex(st.NumValidators())
 	} else {
-		nextValidatorIndex = expectedWithdrawals[len(expectedWithdrawals)-1].ValidatorIndex + 1
-		if nextValidatorIndex == primitives.ValidatorIndex(st.NumValidators()) {
-			nextValidatorIndex = 0
+		if err := checkWithdrawalsAgainstPayload(executionData, len(expectedWithdrawals), expectedRoot); err != nil {
+			return nil, err
 		}
 	}
-	if err := st.SetNextWithdrawalValidatorIndex(nextValidatorIndex); err != nil {
-		return nil, errors.Wrap(err, "could not set next withdrawal validator index")
+	if err := processWithdrawalStateTransition(st, expectedWithdrawals, partialWithdrawalsCount); err != nil {
+		return nil, err
 	}
 	return st, nil
 }

beacon-chain/core/blocks/withdrawals_test.go

@@ -1167,13 +1167,407 @@ func TestProcessWithdrawals(t *testing.T) {
 						checkPostState(t, test.Control, post)
 					}
 					params.BeaconConfig().MaxValidatorsPerWithdrawalsSweep = saved
-
 				})
 			}
 		})
 	}
 }
 
+func TestProcessWithdrawalsEPBS(t *testing.T) {
+	const (
+		currentEpoch             = primitives.Epoch(10)
+		epochInFuture            = primitives.Epoch(12)
+		epochInPast              = primitives.Epoch(8)
+		numValidators            = 128
+		notWithdrawableIndex     = 127
+		notPartiallyWithdrawable = 126
+		maxSweep                 = uint64(80)
+	)
+	maxEffectiveBalance := params.BeaconConfig().MaxEffectiveBalance
+
+	type args struct {
+		Name                            string
+		NextWithdrawalValidatorIndex    primitives.ValidatorIndex
+		NextWithdrawalIndex             uint64
+		FullWithdrawalIndices           []primitives.ValidatorIndex
+		PendingPartialWithdrawalIndices []primitives.ValidatorIndex
+		Withdrawals                     []*enginev1.Withdrawal
+		PendingPartialWithdrawals       []*ethpb.PendingPartialWithdrawal // Electra
+		LatestBlockHash                 []byte                            // EIP-7732
+	}
+	type control struct {
+		NextWithdrawalValidatorIndex primitives.ValidatorIndex
+		NextWithdrawalIndex          uint64
+		Balances                     map[uint64]uint64
+	}
+	type Test struct {
+		Args    args
+		Control control
+	}
+	executionAddress := func(i primitives.ValidatorIndex) []byte {
+		wc := make([]byte, 20)
+		wc[19] = byte(i)
+		return wc
+	}
+	withdrawalAmount := func(i primitives.ValidatorIndex) uint64 {
+		return maxEffectiveBalance + uint64(i)*100000
+	}
+	fullWithdrawal := func(i primitives.ValidatorIndex, idx uint64) *enginev1.Withdrawal {
+		return &enginev1.Withdrawal{
+			Index:          idx,
+			ValidatorIndex: i,
+			Address:        executionAddress(i),
+			Amount:         withdrawalAmount(i),
+		}
+	}
+	PendingPartialWithdrawal := func(i primitives.ValidatorIndex, idx uint64) *enginev1.Withdrawal {
+		return &enginev1.Withdrawal{
+			Index:          idx,
+			ValidatorIndex: i,
+			Address:        executionAddress(i),
+			Amount:         withdrawalAmount(i) - maxEffectiveBalance,
+		}
+	}
+	tests := []Test{
+		{
+			Args: args{
+				Name:                         "success no withdrawals",
+				NextWithdrawalValidatorIndex: 10,
+				NextWithdrawalIndex:          3,
+			},
+			Control: control{
+				NextWithdrawalValidatorIndex: 90,
+				NextWithdrawalIndex:          3,
+			},
+		},
+		{
+			Args: args{
+				Name:                         "success one full withdrawal",
+				NextWithdrawalIndex:          3,
+				NextWithdrawalValidatorIndex: 5,
+				FullWithdrawalIndices:        []primitives.ValidatorIndex{70},
+				Withdrawals: []*enginev1.Withdrawal{
+					fullWithdrawal(70, 3),
+				},
+			},
+			Control: control{
+				NextWithdrawalValidatorIndex: 85,
+				NextWithdrawalIndex:          4,
+				Balances:                     map[uint64]uint64{70: 0},
+			},
+		},
+		{
+			Args: args{
+				Name:                            "success one partial withdrawal",
+				NextWithdrawalIndex:             21,
+				NextWithdrawalValidatorIndex:    120,
+				PendingPartialWithdrawalIndices: []primitives.ValidatorIndex{7},
+				Withdrawals: []*enginev1.Withdrawal{
+					PendingPartialWithdrawal(7, 21),
+				},
+			},
+			Control: control{
+				NextWithdrawalValidatorIndex: 72,
+				NextWithdrawalIndex:          22,
+				Balances:                     map[uint64]uint64{7: maxEffectiveBalance},
+			},
+		},
+		{
+			Args: args{
+				Name:                         "success many full withdrawals",
+				NextWithdrawalIndex:          22,
+				NextWithdrawalValidatorIndex: 4,
+				FullWithdrawalIndices:        []primitives.ValidatorIndex{7, 19, 28, 1},
+				Withdrawals: []*enginev1.Withdrawal{
+					fullWithdrawal(7, 22), fullWithdrawal(19, 23), fullWithdrawal(28, 24),
+				},
+			},
+			Control: control{
+				NextWithdrawalValidatorIndex: 84,
+				NextWithdrawalIndex:          25,
+				Balances:                     map[uint64]uint64{7: 0, 19: 0, 28: 0},
+			},
+		},
+		{
+			Args: args{
+				Name:                         "less than max sweep at end",
+				NextWithdrawalIndex:          22,
+				NextWithdrawalValidatorIndex: 4,
+				FullWithdrawalIndices:        []primitives.ValidatorIndex{80, 81, 82, 83},
+				Withdrawals: []*enginev1.Withdrawal{
+					fullWithdrawal(80, 22), fullWithdrawal(81, 23), fullWithdrawal(82, 24),
+					fullWithdrawal(83, 25),
+				},
+			},
+			Control: control{
+				NextWithdrawalValidatorIndex: 84,
+				NextWithdrawalIndex:          26,
+				Balances:                     map[uint64]uint64{80: 0, 81: 0, 82: 0, 83: 0},
+			},
+		},
+		{
+			Args: args{
+				Name:                         "less than max sweep and beginning",
+				NextWithdrawalIndex:          22,
+				NextWithdrawalValidatorIndex: 4,
+				FullWithdrawalIndices:        []primitives.ValidatorIndex{4, 5, 6},
+				Withdrawals: []*enginev1.Withdrawal{
+					fullWithdrawal(4, 22), fullWithdrawal(5, 23), fullWithdrawal(6, 24),
+				},
+			},
+			Control: control{
+				NextWithdrawalValidatorIndex: 84,
+				NextWithdrawalIndex:          25,
+				Balances:                     map[uint64]uint64{4: 0, 5: 0, 6: 0},
+			},
+		},
+		{
+			Args: args{
+				Name:                            "success many partial withdrawals",
+				NextWithdrawalIndex:             22,
+				NextWithdrawalValidatorIndex:    4,
+				PendingPartialWithdrawalIndices: []primitives.ValidatorIndex{7, 19, 28},
+				Withdrawals: []*enginev1.Withdrawal{
+					PendingPartialWithdrawal(7, 22), PendingPartialWithdrawal(19, 23), PendingPartialWithdrawal(28, 24),
+				},
+			},
+			Control: control{
+				NextWithdrawalValidatorIndex: 84,
+				NextWithdrawalIndex:          25,
+				Balances: map[uint64]uint64{
+					7:  maxEffectiveBalance,
+					19: maxEffectiveBalance,
+					28: maxEffectiveBalance,
+				},
+			},
+		},
+		{
+			Args: args{
+				Name:                            "success many withdrawals",
+				NextWithdrawalIndex:             22,
+				NextWithdrawalValidatorIndex:    88,
+				FullWithdrawalIndices:           []primitives.ValidatorIndex{7, 19, 28},
+				PendingPartialWithdrawalIndices: []primitives.ValidatorIndex{2, 1, 89, 15},
+				Withdrawals: []*enginev1.Withdrawal{
+					PendingPartialWithdrawal(89, 22), PendingPartialWithdrawal(1, 23), PendingPartialWithdrawal(2, 24),
+					fullWithdrawal(7, 25), PendingPartialWithdrawal(15, 26), fullWithdrawal(19, 27),
+					fullWithdrawal(28, 28),
+				},
+			},
+			Control: control{
+				NextWithdrawalValidatorIndex: 40,
+				NextWithdrawalIndex:          29,
+				Balances: map[uint64]uint64{
+					7: 0, 19: 0, 28: 0,
+					2: maxEffectiveBalance, 1: maxEffectiveBalance, 89: maxEffectiveBalance,
+					15: maxEffectiveBalance,
+				},
+			},
+		},
+		{
+			Args: args{
+				Name:                            "success many withdrawals with pending partial withdrawals in state",
+				NextWithdrawalIndex:             22,
+				NextWithdrawalValidatorIndex:    88,
+				FullWithdrawalIndices:           []primitives.ValidatorIndex{7, 19, 28},
+				PendingPartialWithdrawalIndices: []primitives.ValidatorIndex{2, 1, 89, 15},
+				Withdrawals: []*enginev1.Withdrawal{
+					PendingPartialWithdrawal(89, 22), PendingPartialWithdrawal(1, 23), PendingPartialWithdrawal(2, 24),
+					fullWithdrawal(7, 25), PendingPartialWithdrawal(15, 26), fullWithdrawal(19, 27),
+					fullWithdrawal(28, 28),
+				},
+				PendingPartialWithdrawals: []*ethpb.PendingPartialWithdrawal{
+					{
+						Index:  11,
+						Amount: withdrawalAmount(11) - maxEffectiveBalance,
+					},
+				},
+			},
+			Control: control{
+				NextWithdrawalValidatorIndex: 40,
+				NextWithdrawalIndex:          29,
+				Balances: map[uint64]uint64{
+					7: 0, 19: 0, 28: 0,
+					2: maxEffectiveBalance, 1: maxEffectiveBalance, 89: maxEffectiveBalance,
+					15: maxEffectiveBalance,
+				},
+			},
+		},
+
+		{
+			Args: args{
+				Name:                         "success more than max fully withdrawals",
+				NextWithdrawalIndex:          22,
+				NextWithdrawalValidatorIndex: 0,
+				FullWithdrawalIndices:        []primitives.ValidatorIndex{1, 2, 3, 4, 5, 6, 7, 8, 9, 21, 22, 23, 24, 25, 26, 27, 29, 35, 89},
+				Withdrawals: []*enginev1.Withdrawal{
+					fullWithdrawal(1, 22), fullWithdrawal(2, 23), fullWithdrawal(3, 24),
+					fullWithdrawal(4, 25), fullWithdrawal(5, 26), fullWithdrawal(6, 27),
+					fullWithdrawal(7, 28), fullWithdrawal(8, 29), fullWithdrawal(9, 30),
+					fullWithdrawal(21, 31), fullWithdrawal(22, 32), fullWithdrawal(23, 33),
+					fullWithdrawal(24, 34), fullWithdrawal(25, 35), fullWithdrawal(26, 36),
+					fullWithdrawal(27, 37),
+				},
+			},
+			Control: control{
+				NextWithdrawalValidatorIndex: 28,
+				NextWithdrawalIndex:          38,
+				Balances: map[uint64]uint64{
+					1: 0, 2: 0, 3: 0, 4: 0, 5: 0, 6: 0, 7: 0, 8: 0, 9: 0,
+					21: 0, 22: 0, 23: 0, 24: 0, 25: 0, 26: 0, 27: 0,
+				},
+			},
+		},
+		{
+			Args: args{
+				Name:                            "success more than max partially withdrawals",
+				NextWithdrawalIndex:             22,
+				NextWithdrawalValidatorIndex:    0,
+				PendingPartialWithdrawalIndices: []primitives.ValidatorIndex{1, 2, 3, 4, 5, 6, 7, 8, 9, 21, 22, 23, 24, 25, 26, 27, 29, 35, 89},
+				Withdrawals: []*enginev1.Withdrawal{
+					PendingPartialWithdrawal(1, 22), PendingPartialWithdrawal(2, 23), PendingPartialWithdrawal(3, 24),
+					PendingPartialWithdrawal(4, 25), PendingPartialWithdrawal(5, 26), PendingPartialWithdrawal(6, 27),
+					PendingPartialWithdrawal(7, 28), PendingPartialWithdrawal(8, 29), PendingPartialWithdrawal(9, 30),
+					PendingPartialWithdrawal(21, 31), PendingPartialWithdrawal(22, 32), PendingPartialWithdrawal(23, 33),
+					PendingPartialWithdrawal(24, 34), PendingPartialWithdrawal(25, 35), PendingPartialWithdrawal(26, 36),
+					PendingPartialWithdrawal(27, 37),
+				},
+			},
+			Control: control{
+				NextWithdrawalValidatorIndex: 28,
+				NextWithdrawalIndex:          38,
+				Balances: map[uint64]uint64{
+					1:  maxEffectiveBalance,
+					2:  maxEffectiveBalance,
+					3:  maxEffectiveBalance,
+					4:  maxEffectiveBalance,
+					5:  maxEffectiveBalance,
+					6:  maxEffectiveBalance,
+					7:  maxEffectiveBalance,
+					8:  maxEffectiveBalance,
+					9:  maxEffectiveBalance,
+					21: maxEffectiveBalance,
+					22: maxEffectiveBalance,
+					23: maxEffectiveBalance,
+					24: maxEffectiveBalance,
+					25: maxEffectiveBalance,
+					26: maxEffectiveBalance,
+					27: maxEffectiveBalance,
+				},
+			},
+		},
+		{
+			Args: args{
+				Name:                         "Parent Node is not full",
+				NextWithdrawalIndex:          22,
+				NextWithdrawalValidatorIndex: 4,
+				FullWithdrawalIndices:        []primitives.ValidatorIndex{7, 19, 28, 1},
+				Withdrawals: []*enginev1.Withdrawal{
+					fullWithdrawal(7, 22), fullWithdrawal(19, 23), fullWithdrawal(28, 24),
+				},
+				LatestBlockHash: []byte{1, 2, 3},
+			},
+		},
+	}
+
+	checkPostState := func(t *testing.T, expected control, st state.BeaconState) {
+		l, err := st.NextWithdrawalValidatorIndex()
+		require.NoError(t, err)
+		require.Equal(t, expected.NextWithdrawalValidatorIndex, l)
+
+		n, err := st.NextWithdrawalIndex()
+		require.NoError(t, err)
+		require.Equal(t, expected.NextWithdrawalIndex, n)
+		balances := st.Balances()
+		for idx, bal := range expected.Balances {
+			require.Equal(t, bal, balances[idx])
+		}
+	}
+
+	prepareValidators := func(st state.BeaconState, arguments args) error {
+		validators := make([]*ethpb.Validator, numValidators)
+		if err := st.SetBalances(make([]uint64, numValidators)); err != nil {
+			return err
+		}
+		for i := range validators {
+			v := &ethpb.Validator{}
+			v.EffectiveBalance = maxEffectiveBalance
+			v.WithdrawableEpoch = epochInFuture
+			v.WithdrawalCredentials = make([]byte, 32)
+			v.WithdrawalCredentials[31] = byte(i)
+			if err := st.UpdateBalancesAtIndex(primitives.ValidatorIndex(i), v.EffectiveBalance-uint64(rand.Intn(1000))); err != nil {
+				return err
+			}
+			validators[i] = v
+		}
+		for _, idx := range arguments.FullWithdrawalIndices {
+			if idx != notWithdrawableIndex {
+				validators[idx].WithdrawableEpoch = epochInPast
+			}
+			if err := st.UpdateBalancesAtIndex(idx, withdrawalAmount(idx)); err != nil {
+				return err
+			}
+			validators[idx].WithdrawalCredentials[0] = params.BeaconConfig().ETH1AddressWithdrawalPrefixByte
+		}
+		for _, idx := range arguments.PendingPartialWithdrawalIndices {
+			validators[idx].WithdrawalCredentials[0] = params.BeaconConfig().ETH1AddressWithdrawalPrefixByte
+			if err := st.UpdateBalancesAtIndex(idx, withdrawalAmount(idx)); err != nil {
+				return err
+			}
+		}
+		return st.SetValidators(validators)
+	}
+
+	for _, test := range tests {
+		t.Run(test.Args.Name, func(t *testing.T) {
+			saved := params.BeaconConfig().MaxValidatorsPerWithdrawalsSweep
+			params.BeaconConfig().MaxValidatorsPerWithdrawalsSweep = maxSweep
+			if test.Args.Withdrawals == nil {
+				test.Args.Withdrawals = make([]*enginev1.Withdrawal, 0)
+			}
+			if test.Args.FullWithdrawalIndices == nil {
+				test.Args.FullWithdrawalIndices = make([]primitives.ValidatorIndex, 0)
+			}
+			if test.Args.PendingPartialWithdrawalIndices == nil {
+				test.Args.PendingPartialWithdrawalIndices = make([]primitives.ValidatorIndex, 0)
+			}
+			slot, err := slots.EpochStart(currentEpoch)
+			require.NoError(t, err)
+			var st state.BeaconState
+			var p interfaces.ExecutionData
+			spb := &ethpb.BeaconStateEPBS{
+				Slot:                         slot,
+				NextWithdrawalValidatorIndex: test.Args.NextWithdrawalValidatorIndex,
+				NextWithdrawalIndex:          test.Args.NextWithdrawalIndex,
+				PendingPartialWithdrawals:    test.Args.PendingPartialWithdrawals,
+				LatestExecutionPayloadHeader: &enginev1.ExecutionPayloadHeaderEPBS{
+					BlockHash: []byte{},
+				},
+				LatestBlockHash: test.Args.LatestBlockHash,
+			}
+			st, err = state_native.InitializeFromProtoUnsafeEpbs(spb)
+			require.NoError(t, err)
+			env := random.ExecutionPayloadEnvelope(t)
+			env.Payload.Withdrawals = test.Args.Withdrawals
+			wp, err := consensusblocks.WrappedROExecutionPayloadEnvelope(env)
+			require.NoError(t, err)
+			p, err = wp.Execution()
+			require.NoError(t, err)
+			err = prepareValidators(st, test.Args)
+			require.NoError(t, err)
+			post, err := blocks.ProcessWithdrawals(st, p)
+			if test.Args.Name == "Parent Node is not full" {
+				require.DeepEqual(t, post, st)
+				require.IsNil(t, err)
+			} else {
+				require.NoError(t, err)
+				checkPostState(t, test.Control, post)
+			}
+			params.BeaconConfig().MaxValidatorsPerWithdrawalsSweep = saved
+		})
+	}
+}
+
 func TestProcessBLSToExecutionChanges(t *testing.T) {
 	spb := &ethpb.BeaconStateCapella{
 		Fork: &ethpb.Fork{

beacon-chain/core/electra/BUILD.bazel

@@ -11,7 +11,6 @@ go_library(
         "error.go",
         "registry_updates.go",
         "transition.go",
-        "transition_no_verify_sig.go",
         "upgrade.go",
         "validator.go",
         "withdrawals.go",

beacon-chain/core/epbs/BUILD.bazel

@@ -0,0 +1,62 @@
+load("@prysm//tools/go:def.bzl", "go_library", "go_test")
+
+go_library(
+    name = "go_default_library",
+    srcs = [
+        "attestation.go",
+        "error.go",
+        "execution_payload_envelope.go",
+        "execution_payload_header.go",
+        "operations.go",
+        "payload_attestation.go",
+        "upgrade.go",
+    ],
+    importpath = "github.com/OffchainLabs/prysm/v6/beacon-chain/core/epbs",
+    visibility = ["//visibility:public"],
+    deps = [
+        "//beacon-chain/core/altair:go_default_library",
+        "//beacon-chain/core/blocks:go_default_library",
+        "//beacon-chain/core/electra:go_default_library",
+        "//beacon-chain/core/helpers:go_default_library",
+        "//beacon-chain/core/signing:go_default_library",
+        "//beacon-chain/core/time:go_default_library",
+        "//beacon-chain/core/validators:go_default_library",
+        "//beacon-chain/state:go_default_library",
+        "//beacon-chain/state/state-native:go_default_library",
+        "//config/params:go_default_library",
+        "//consensus-types/interfaces:go_default_library",
+        "//consensus-types/primitives:go_default_library",
+        "//crypto/bls:go_default_library",
+        "//network/forks:go_default_library",
+        "//proto/engine/v1:go_default_library",
+        "//proto/prysm/v1alpha1:go_default_library",
+        "//runtime/version:go_default_library",
+        "//time/slots:go_default_library",
+        "@com_github_pkg_errors//:go_default_library",
+    ],
+)
+
+go_test(
+    name = "go_default_test",
+    srcs = [
+        "attestation_test.go",
+        "execution_payload_envelope_test.go",
+        "upgrade_test.go",
+    ],
+    deps = [
+        ":go_default_library",
+        "//beacon-chain/core/altair:go_default_library",
+        "//beacon-chain/core/helpers:go_default_library",
+        "//beacon-chain/core/time:go_default_library",
+        "//beacon-chain/state/state-native:go_default_library",
+        "//config/params:go_default_library",
+        "//consensus-types/blocks:go_default_library",
+        "//consensus-types/primitives:go_default_library",
+        "//proto/engine/v1:go_default_library",
+        "//proto/prysm/v1alpha1:go_default_library",
+        "//testing/require:go_default_library",
+        "//testing/util:go_default_library",
+        "//testing/util/random:go_default_library",
+        "//time/slots:go_default_library",
+    ],
+)

beacon-chain/core/epbs/attestation.go

@@ -0,0 +1,13 @@
+package epbs
+
+import (
+	"fmt"
+)
+
+// RemoveValidatorFlag removes validator flag from existing one.
+func RemoveValidatorFlag(flag, flagPosition uint8) (uint8, error) {
+	if flagPosition > 7 {
+		return flag, fmt.Errorf("flag position %d exceeds length", flagPosition)
+	}
+	return flag & ^(1 << flagPosition), nil
+}

beacon-chain/core/epbs/attestation_test.go

@@ -0,0 +1,93 @@
+package epbs_test
+
+import (
+	"testing"
+
+	"github.com/OffchainLabs/prysm/v6/beacon-chain/core/altair"
+	"github.com/OffchainLabs/prysm/v6/beacon-chain/core/epbs"
+	"github.com/OffchainLabs/prysm/v6/config/params"
+	"github.com/OffchainLabs/prysm/v6/testing/require"
+)
+
+func TestValidatorFlag_Remove(t *testing.T) {
+	tests := []struct {
+		name          string
+		add           []uint8
+		remove        []uint8
+		expectedTrue  []uint8
+		expectedFalse []uint8
+	}{
+		{
+			name:          "none",
+			add:           []uint8{},
+			remove:        []uint8{},
+			expectedTrue:  []uint8{},
+			expectedFalse: []uint8{params.BeaconConfig().TimelySourceFlagIndex, params.BeaconConfig().TimelyTargetFlagIndex, params.BeaconConfig().TimelyHeadFlagIndex},
+		},
+		{
+			name:          "source",
+			add:           []uint8{params.BeaconConfig().TimelySourceFlagIndex},
+			remove:        []uint8{params.BeaconConfig().TimelySourceFlagIndex},
+			expectedTrue:  []uint8{},
+			expectedFalse: []uint8{params.BeaconConfig().TimelySourceFlagIndex, params.BeaconConfig().TimelyTargetFlagIndex, params.BeaconConfig().TimelyHeadFlagIndex},
+		},
+		{
+			name:          "source, target",
+			add:           []uint8{params.BeaconConfig().TimelySourceFlagIndex, params.BeaconConfig().TimelyTargetFlagIndex},
+			remove:        []uint8{params.BeaconConfig().TimelySourceFlagIndex},
+			expectedTrue:  []uint8{params.BeaconConfig().TimelyTargetFlagIndex},
+			expectedFalse: []uint8{params.BeaconConfig().TimelySourceFlagIndex, params.BeaconConfig().TimelyHeadFlagIndex},
+		},
+		{
+			name:          "source, target, head",
+			add:           []uint8{params.BeaconConfig().TimelySourceFlagIndex, params.BeaconConfig().TimelyTargetFlagIndex, params.BeaconConfig().TimelyHeadFlagIndex},
+			remove:        []uint8{params.BeaconConfig().TimelyTargetFlagIndex, params.BeaconConfig().TimelyHeadFlagIndex},
+			expectedTrue:  []uint8{params.BeaconConfig().TimelySourceFlagIndex},
+			expectedFalse: []uint8{params.BeaconConfig().TimelyTargetFlagIndex, params.BeaconConfig().TimelyHeadFlagIndex},
+		},
+	}
+	var err error
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			flag := uint8(0)
+
+			// Add flags.
+			for _, flagPosition := range test.add {
+				flag, err = altair.AddValidatorFlag(flag, flagPosition)
+				require.NoError(t, err)
+
+				has, err := altair.HasValidatorFlag(flag, flagPosition)
+				require.NoError(t, err)
+				require.Equal(t, true, has)
+			}
+
+			// Remove flags.
+			for _, flagPosition := range test.remove {
+				flag, err = epbs.RemoveValidatorFlag(flag, flagPosition)
+				require.NoError(t, err)
+			}
+
+			// Check if flags are set correctly.
+			for _, flagPosition := range test.expectedTrue {
+				has, err := altair.HasValidatorFlag(flag, flagPosition)
+				require.NoError(t, err)
+				require.Equal(t, true, has)
+			}
+			for _, flagPosition := range test.expectedFalse {
+				has, err := altair.HasValidatorFlag(flag, flagPosition)
+				require.NoError(t, err)
+				require.Equal(t, false, has)
+			}
+		})
+	}
+}
+
+func TestValidatorFlag_Remove_ExceedsLength(t *testing.T) {
+	_, err := epbs.RemoveValidatorFlag(0, 8)
+	require.ErrorContains(t, "flag position 8 exceeds length", err)
+}
+
+func TestValidatorFlag_Remove_NotSet(t *testing.T) {
+	_, err := epbs.RemoveValidatorFlag(0, 1)
+	require.NoError(t, err)
+}

beacon-chain/core/epbs/error.go

@@ -0,0 +1,16 @@
+package epbs
+
+import "github.com/pkg/errors"
+
+type execReqErr struct {
+	error
+}
+
+// IsExecutionRequestError returns true if the error has `execReqErr`.
+func IsExecutionRequestError(e error) bool {
+	if e == nil {
+		return false
+	}
+	var d execReqErr
+	return errors.As(e, &d)
+}

beacon-chain/core/epbs/execution_payload_envelope.go

@@ -0,0 +1,126 @@
+package epbs
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/OffchainLabs/prysm/v6/beacon-chain/core/electra"
+	"github.com/OffchainLabs/prysm/v6/beacon-chain/state"
+	"github.com/OffchainLabs/prysm/v6/consensus-types/interfaces"
+	enginev1 "github.com/OffchainLabs/prysm/v6/proto/engine/v1"
+	"github.com/pkg/errors"
+)
+
+// ValidatePayloadStateTransition performs the process_execution_payload
+// function.
+func ValidatePayloadStateTransition(
+	ctx context.Context,
+	preState state.BeaconState,
+	envelope interfaces.ROExecutionPayloadEnvelope,
+) error {
+	if err := UpdateHeaderAndVerify(ctx, preState, envelope); err != nil {
+		return err
+	}
+	committedHeader, err := preState.LatestExecutionPayloadHeaderEPBS()
+	if err != nil {
+		return err
+	}
+	if err := ValidateAgainstCommittedBid(committedHeader, envelope); err != nil {
+		return err
+	}
+	if err := ProcessPayloadStateTransition(ctx, preState, envelope); err != nil {
+		return err
+	}
+	return CheckPostStateRoot(ctx, preState, envelope)
+}
+
+func ProcessPayloadStateTransition(
+	ctx context.Context,
+	preState state.BeaconState,
+	envelope interfaces.ROExecutionPayloadEnvelope,
+) error {
+	er := envelope.ExecutionRequests()
+	preState, err := electra.ProcessDepositRequests(ctx, preState, er.Deposits)
+	if err != nil {
+		return errors.Wrap(err, "could not process deposit receipts")
+	}
+	preState, err = electra.ProcessWithdrawalRequests(ctx, preState, er.Withdrawals)
+	if err != nil {
+		return errors.Wrap(err, "could not process ercution layer withdrawal requests")
+	}
+	if err := electra.ProcessConsolidationRequests(ctx, preState, er.Consolidations); err != nil {
+		return errors.Wrap(err, "could not process consolidation requests")
+	}
+	payload, err := envelope.Execution()
+	if err != nil {
+		return errors.Wrap(err, "could not get execution payload")
+	}
+	if err := preState.SetLatestBlockHash(payload.BlockHash()); err != nil {
+		return err
+	}
+	return preState.SetLatestFullSlot(preState.Slot())
+}
+
+func UpdateHeaderAndVerify(
+	ctx context.Context,
+	preState state.BeaconState,
+	envelope interfaces.ROExecutionPayloadEnvelope,
+) error {
+	blockHeader := preState.LatestBlockHeader()
+	if blockHeader == nil {
+		return errors.New("invalid nil latest block header")
+	}
+	if len(blockHeader.StateRoot) == 0 || [32]byte(blockHeader.StateRoot) == [32]byte{} {
+		prevStateRoot, err := preState.HashTreeRoot(ctx)
+		if err != nil {
+			return errors.Wrap(err, "could not compute previous state root")
+		}
+		blockHeader.StateRoot = prevStateRoot[:]
+		if err := preState.SetLatestBlockHeader(blockHeader); err != nil {
+			return errors.Wrap(err, "could not set latest block header")
+		}
+	}
+	blockHeaderRoot, err := blockHeader.HashTreeRoot()
+	if err != nil {
+		return err
+	}
+	beaconBlockRoot := envelope.BeaconBlockRoot()
+	if blockHeaderRoot != beaconBlockRoot {
+		return fmt.Errorf("beacon block root does not match previous header, got: %#x wanted: %#x", beaconBlockRoot, blockHeaderRoot)
+	}
+	return nil
+}
+
+func ValidateAgainstCommittedBid(
+	committedHeader *enginev1.ExecutionPayloadHeaderEPBS,
+	envelope interfaces.ROExecutionPayloadEnvelope,
+) error {
+	builderIndex := envelope.BuilderIndex()
+	if committedHeader.BuilderIndex != builderIndex {
+		return errors.New("builder index does not match committed header")
+	}
+	kzgRoot, err := envelope.BlobKzgCommitmentsRoot()
+	if err != nil {
+		return err
+	}
+	if [32]byte(committedHeader.BlobKzgCommitmentsRoot) != kzgRoot {
+		return errors.New("blob KZG commitments root does not match committed header")
+	}
+	return nil
+}
+
+func CheckPostStateRoot(
+	ctx context.Context,
+	preState state.BeaconState,
+	envelope interfaces.ROExecutionPayloadEnvelope,
+) error {
+	stateRoot, err := preState.HashTreeRoot(ctx)
+	if err != nil {
+		return err
+	}
+	envelopeStateRoot := envelope.StateRoot()
+	if stateRoot != envelopeStateRoot {
+		return errors.New("state root mismatch")
+	}
+	return nil
+}

beacon-chain/core/epbs/execution_payload_envelope_test.go

@@ -0,0 +1,110 @@
+package epbs_test
+
+import (
+	"context"
+	"testing"
+
+	"github.com/OffchainLabs/prysm/v6/beacon-chain/core/epbs"
+	state_native "github.com/OffchainLabs/prysm/v6/beacon-chain/state/state-native"
+	"github.com/OffchainLabs/prysm/v6/consensus-types/blocks"
+	enginev1 "github.com/OffchainLabs/prysm/v6/proto/engine/v1"
+	ethpb "github.com/OffchainLabs/prysm/v6/proto/prysm/v1alpha1"
+	"github.com/OffchainLabs/prysm/v6/testing/require"
+	"github.com/OffchainLabs/prysm/v6/testing/util"
+	"github.com/OffchainLabs/prysm/v6/testing/util/random"
+)
+
+func TestProcessPayloadStateTransition(t *testing.T) {
+	bh := [32]byte{'h'}
+	p := random.ExecutionPayloadEnvelope(t)
+	p.Payload.BlockHash = bh[:]
+	p.ExecutionRequests = &enginev1.ExecutionRequests{}
+	e, err := blocks.WrappedROExecutionPayloadEnvelope(p)
+	require.NoError(t, err)
+	validators := make([]*ethpb.Validator, 0)
+	stpb := &ethpb.BeaconStateEPBS{Slot: 3, Validators: validators}
+	st, err := state_native.InitializeFromProtoUnsafeEpbs(stpb)
+	require.NoError(t, err)
+	ctx := context.Background()
+
+	lbh, err := st.LatestBlockHash()
+	require.NoError(t, err)
+	require.Equal(t, [32]byte{}, [32]byte(lbh))
+
+	require.NoError(t, epbs.ProcessPayloadStateTransition(ctx, st, e))
+
+	lbh, err = st.LatestBlockHash()
+	require.NoError(t, err)
+	require.Equal(t, bh, [32]byte(lbh))
+
+	lfs, err := st.LatestFullSlot()
+	require.NoError(t, err)
+	require.Equal(t, lfs, st.Slot())
+}
+
+func Test_validateAgainstHeader(t *testing.T) {
+	bh := [32]byte{'h'}
+	payload := &enginev1.ExecutionPayloadDeneb{BlockHash: bh[:]}
+	p := random.ExecutionPayloadEnvelope(t)
+	p.Payload = payload
+	e, err := blocks.WrappedROExecutionPayloadEnvelope(p)
+	require.NoError(t, err)
+	stpb := &ethpb.BeaconStateEPBS{Slot: 3}
+	st, err := state_native.InitializeFromProtoUnsafeEpbs(stpb)
+	require.NoError(t, err)
+	ctx := context.Background()
+	require.ErrorContains(t, "invalid nil latest block header", epbs.UpdateHeaderAndVerify(ctx, st, e))
+
+	prest, _ := util.DeterministicGenesisStateEpbs(t, 64)
+	br := [32]byte{'r'}
+	p.BeaconBlockRoot = br[:]
+	require.ErrorContains(t, "beacon block root does not match previous header", epbs.UpdateHeaderAndVerify(ctx, prest, e))
+
+	header := prest.LatestBlockHeader()
+	require.NoError(t, err)
+	headerRoot, err := header.HashTreeRoot()
+	require.NoError(t, err)
+	p.BeaconBlockRoot = headerRoot[:]
+	require.NoError(t, epbs.UpdateHeaderAndVerify(ctx, prest, e))
+}
+
+func Test_validateAgainstCommittedBid(t *testing.T) {
+	payload := &enginev1.ExecutionPayloadDeneb{}
+	p := random.ExecutionPayloadEnvelope(t)
+	p.Payload = payload
+	p.BuilderIndex = 1
+	e, err := blocks.WrappedROExecutionPayloadEnvelope(p)
+	require.NoError(t, err)
+	h := &enginev1.ExecutionPayloadHeaderEPBS{}
+	require.ErrorContains(t, "builder index does not match committed header", epbs.ValidateAgainstCommittedBid(h, e))
+
+	h.BuilderIndex = 1
+	p.BlobKzgCommitments = make([][]byte, 6)
+	for i := range p.BlobKzgCommitments {
+		p.BlobKzgCommitments[i] = make([]byte, 48)
+	}
+	h.BlobKzgCommitmentsRoot = make([]byte, 32)
+	require.ErrorContains(t, "blob KZG commitments root does not match committed header", epbs.ValidateAgainstCommittedBid(h, e))
+
+	root, err := e.BlobKzgCommitmentsRoot()
+	require.NoError(t, err)
+	h.BlobKzgCommitmentsRoot = root[:]
+	require.NoError(t, epbs.ValidateAgainstCommittedBid(h, e))
+}
+
+func TestCheckPostStateRoot(t *testing.T) {
+	payload := &enginev1.ExecutionPayloadDeneb{}
+	p := random.ExecutionPayloadEnvelope(t)
+	p.Payload = payload
+	p.BuilderIndex = 1
+	e, err := blocks.WrappedROExecutionPayloadEnvelope(p)
+	require.NoError(t, err)
+	ctx := context.Background()
+	st, _ := util.DeterministicGenesisStateEpbs(t, 64)
+	p.BeaconStateRoot = make([]byte, 32)
+	require.ErrorContains(t, "state root mismatch", epbs.CheckPostStateRoot(ctx, st, e))
+	root, err := st.HashTreeRoot(ctx)
+	require.NoError(t, err)
+	p.BeaconStateRoot = root[:]
+	require.NoError(t, epbs.CheckPostStateRoot(ctx, st, e))
+}

beacon-chain/core/epbs/execution_payload_header.go

@@ -0,0 +1,50 @@
+package epbs
+
+import (
+	"github.com/OffchainLabs/prysm/v6/beacon-chain/core/signing"
+	"github.com/OffchainLabs/prysm/v6/beacon-chain/state"
+	"github.com/OffchainLabs/prysm/v6/config/params"
+	"github.com/OffchainLabs/prysm/v6/consensus-types/interfaces"
+	"github.com/OffchainLabs/prysm/v6/crypto/bls"
+	"github.com/OffchainLabs/prysm/v6/network/forks"
+	"github.com/OffchainLabs/prysm/v6/time/slots"
+)
+
+// ValidatePayloadHeaderSignature validates the signature of the execution payload header.
+func ValidatePayloadHeaderSignature(st state.ReadOnlyBeaconState, sh interfaces.ROSignedExecutionPayloadHeader) error {
+	h, err := sh.Header()
+	if err != nil {
+		return err
+	}
+	pubkey := st.PubkeyAtIndex(h.BuilderIndex())
+	pub, err := bls.PublicKeyFromBytes(pubkey[:])
+	if err != nil {
+		return err
+	}
+
+	s := sh.Signature()
+	sig, err := bls.SignatureFromBytes(s[:])
+	if err != nil {
+		return err
+	}
+
+	currentEpoch := slots.ToEpoch(h.Slot())
+	f, err := forks.Fork(currentEpoch)
+	if err != nil {
+		return err
+	}
+
+	domain, err := signing.Domain(f, currentEpoch, params.BeaconConfig().DomainBeaconBuilder, st.GenesisValidatorsRoot())
+	if err != nil {
+		return err
+	}
+	root, err := sh.SigningRoot(domain)
+	if err != nil {
+		return err
+	}
+	if !sig.Verify(pub, root[:]) {
+		return signing.ErrSigFailedToVerify
+	}
+
+	return nil
+}

beacon-chain/core/epbs/operations.go

@@ -1,12 +1,14 @@
-package electra
+package epbs
 
 import (
 	"context"
 
 	"github.com/OffchainLabs/prysm/v6/beacon-chain/core/blocks"
+	"github.com/OffchainLabs/prysm/v6/beacon-chain/core/electra"
 	v "github.com/OffchainLabs/prysm/v6/beacon-chain/core/validators"
 	"github.com/OffchainLabs/prysm/v6/beacon-chain/state"
 	"github.com/OffchainLabs/prysm/v6/consensus-types/interfaces"
+	"github.com/OffchainLabs/prysm/v6/runtime/version"
 	"github.com/pkg/errors"
 )
 
@@ -61,11 +63,11 @@ func ProcessOperations(
 	if err != nil {
 		return nil, errors.Wrap(err, "could not process altair attester slashing")
 	}
-	st, err = ProcessAttestationsNoVerifySignature(ctx, st, block)
+	st, err = electra.ProcessAttestationsNoVerifySignature(ctx, st, block)
 	if err != nil {
 		return nil, errors.Wrap(err, "could not process altair attestation")
 	}
-	if _, err := ProcessDeposits(ctx, st, bb.Deposits()); err != nil { // new in electra
+	if _, err := electra.ProcessDeposits(ctx, st, bb.Deposits()); err != nil { // new in electra
 		return nil, errors.Wrap(err, "could not process altair deposit")
 	}
 	st, err = ProcessVoluntaryExits(ctx, st, bb.VoluntaryExits())
@@ -76,6 +78,13 @@ func ProcessOperations(
 	if err != nil {
 		return nil, errors.Wrap(err, "could not process bls-to-execution changes")
 	}
+	// new in ePBS
+	if block.Version() >= version.EPBS {
+		if err := ProcessPayloadAttestations(st, bb); err != nil {
+			return nil, err
+		}
+		return st, nil
+	}
 	// new in electra
 	requests, err := bb.ExecutionRequests()
 	if err != nil {
@@ -86,7 +95,7 @@ func ProcessOperations(
 			return nil, errors.New("nil deposit request")
 		}
 	}
-	st, err = ProcessDepositRequests(ctx, st, requests.Deposits)
+	st, err = electra.ProcessDepositRequests(ctx, st, requests.Deposits)
 	if err != nil {
 		return nil, execReqErr{errors.Wrap(err, "could not process deposit requests")}
 	}
@@ -95,7 +104,7 @@ func ProcessOperations(
 			return nil, errors.New("nil withdrawal request")
 		}
 	}
-	st, err = ProcessWithdrawalRequests(ctx, st, requests.Withdrawals)
+	st, err = electra.ProcessWithdrawalRequests(ctx, st, requests.Withdrawals)
 	if err != nil {
 		return nil, execReqErr{errors.Wrap(err, "could not process withdrawal requests")}
 	}
@@ -104,7 +113,7 @@ func ProcessOperations(
 			return nil, errors.New("nil consolidation request")
 		}
 	}
-	if err := ProcessConsolidationRequests(ctx, st, requests.Consolidations); err != nil {
+	if err := electra.ProcessConsolidationRequests(ctx, st, requests.Consolidations); err != nil {
 		return nil, execReqErr{errors.Wrap(err, "could not process consolidation requests")}
 	}
 	return st, nil

beacon-chain/core/epbs/payload_attestation.go

@@ -0,0 +1,125 @@
+package epbs
+
+import (
+	"bytes"
+	"context"
+	"time"
+
+	"github.com/OffchainLabs/prysm/v6/beacon-chain/core/altair"
+	"github.com/OffchainLabs/prysm/v6/beacon-chain/core/helpers"
+	"github.com/OffchainLabs/prysm/v6/beacon-chain/state"
+	"github.com/OffchainLabs/prysm/v6/config/params"
+	"github.com/OffchainLabs/prysm/v6/consensus-types/interfaces"
+	"github.com/OffchainLabs/prysm/v6/consensus-types/primitives"
+	"github.com/pkg/errors"
+)
+
+func ProcessPayloadAttestations(state state.BeaconState, body interfaces.ReadOnlyBeaconBlockBody) error {
+	atts, err := body.PayloadAttestations()
+	if err != nil {
+		return err
+	}
+	if len(atts) == 0 {
+		return nil
+	}
+
+	ctx, cancel := context.WithTimeout(context.Background(), 12*time.Second)
+	defer cancel()
+	lbh := state.LatestBlockHeader()
+	proposerIndex := lbh.ProposerIndex
+	var participation []byte
+	if state.Slot()%32 == 0 {
+		participation, err = state.PreviousEpochParticipation()
+	} else {
+		participation, err = state.CurrentEpochParticipation()
+	}
+	if err != nil {
+		return err
+	}
+	totalBalance, err := helpers.TotalActiveBalance(state)
+	if err != nil {
+		return err
+	}
+	baseReward, err := altair.BaseRewardWithTotalBalance(state, proposerIndex, totalBalance)
+	if err != nil {
+		return err
+	}
+	lfs, err := state.LatestFullSlot()
+	if err != nil {
+		return err
+	}
+
+	cfg := params.BeaconConfig()
+	sourceFlagIndex := cfg.TimelySourceFlagIndex
+	targetFlagIndex := cfg.TimelyTargetFlagIndex
+	headFlagIndex := cfg.TimelyHeadFlagIndex
+	penaltyNumerator := uint64(0)
+	rewardNumerator := uint64(0)
+	rewardDenominator := (cfg.WeightDenominator - cfg.ProposerWeight) * cfg.WeightDenominator / cfg.ProposerWeight
+
+	for _, att := range atts {
+		data := att.Data
+		if !bytes.Equal(data.BeaconBlockRoot, lbh.ParentRoot) {
+			return errors.New("invalid beacon block root in payload attestation data")
+		}
+		if data.Slot+1 != state.Slot() {
+			return errors.New("invalid data slot")
+		}
+		indexed, err := helpers.GetIndexedPayloadAttestation(ctx, state, data.Slot, att)
+		if err != nil {
+			return err
+		}
+		valid, err := helpers.IsValidIndexedPayloadAttestation(state, indexed)
+		if err != nil {
+			return err
+		}
+		if !valid {
+			return errors.New("invalid payload attestation")
+		}
+		payloadWasPreset := data.Slot == lfs
+		votedPresent := primitives.PTCStatus(data.PayloadStatus[0]) == primitives.PAYLOAD_PRESENT
+		if votedPresent != payloadWasPreset {
+			for _, idx := range indexed.GetAttestingIndices() {
+				flags := participation[idx]
+				has, err := altair.HasValidatorFlag(flags, targetFlagIndex)
+				if err != nil {
+					return err
+				}
+				if has {
+					penaltyNumerator += baseReward * cfg.TimelyTargetWeight
+				}
+				has, err = altair.HasValidatorFlag(flags, sourceFlagIndex)
+				if err != nil {
+					return err
+				}
+				if has {
+					penaltyNumerator += baseReward * cfg.TimelySourceWeight
+				}
+				has, err = altair.HasValidatorFlag(flags, headFlagIndex)
+				if err != nil {
+					return err
+				}
+				if has {
+					penaltyNumerator += baseReward * cfg.TimelyHeadWeight
+				}
+				participation[idx] = 0
+			}
+		} else {
+			for _, idx := range indexed.GetAttestingIndices() {
+				participation[idx] = (1 << headFlagIndex) | (1 << sourceFlagIndex) | (1 << targetFlagIndex)
+				rewardNumerator += baseReward * (cfg.TimelyHeadWeight + cfg.TimelySourceWeight + cfg.TimelyTargetWeight)
+			}
+		}
+	}
+	if penaltyNumerator > 0 {
+		if err := helpers.DecreaseBalance(state, proposerIndex, penaltyNumerator/rewardDenominator); err != nil {
+			return err
+		}
+	}
+	if rewardNumerator > 0 {
+		if err := helpers.IncreaseBalance(state, proposerIndex, penaltyNumerator/rewardDenominator); err != nil {
+			return err
+		}
+	}
+	return nil
+}

beacon-chain/core/epbs/upgrade.go

@@ -0,0 +1,147 @@
+package epbs
+
+import (
+	"github.com/OffchainLabs/prysm/v6/beacon-chain/core/time"
+	"github.com/OffchainLabs/prysm/v6/beacon-chain/state"
+	state_native "github.com/OffchainLabs/prysm/v6/beacon-chain/state/state-native"
+	"github.com/OffchainLabs/prysm/v6/config/params"
+	enginev1 "github.com/OffchainLabs/prysm/v6/proto/engine/v1"
+	ethpb "github.com/OffchainLabs/prysm/v6/proto/prysm/v1alpha1"
+	"github.com/pkg/errors"
+)
+
+// UpgradeToEIP7732 updates inputs a generic state to return the version EIP-7732 state.
+// https://github.com/ethereum/consensus-specs/blob/dev/specs/_features/eip7732/fork.md
+func UpgradeToEIP7732(beaconState state.BeaconState) (state.BeaconState, error) {
+	currentSyncCommittee, err := beaconState.CurrentSyncCommittee()
+	if err != nil {
+		return nil, err
+	}
+	nextSyncCommittee, err := beaconState.NextSyncCommittee()
+	if err != nil {
+		return nil, err
+	}
+	prevEpochParticipation, err := beaconState.PreviousEpochParticipation()
+	if err != nil {
+		return nil, err
+	}
+	currentEpochParticipation, err := beaconState.CurrentEpochParticipation()
+	if err != nil {
+		return nil, err
+	}
+	inactivityScores, err := beaconState.InactivityScores()
+	if err != nil {
+		return nil, err
+	}
+	payloadHeader, err := beaconState.LatestExecutionPayloadHeader()
+	if err != nil {
+		return nil, err
+	}
+	wi, err := beaconState.NextWithdrawalIndex()
+	if err != nil {
+		return nil, err
+	}
+	vi, err := beaconState.NextWithdrawalValidatorIndex()
+	if err != nil {
+		return nil, err
+	}
+	summaries, err := beaconState.HistoricalSummaries()
+	if err != nil {
+		return nil, err
+	}
+	historicalRoots := beaconState.HistoricalRoots()
+	depositBalanceToConsume, err := beaconState.DepositBalanceToConsume()
+	if err != nil {
+		return nil, err
+	}
+	exitBalanceToConsume, err := beaconState.ExitBalanceToConsume()
+	if err != nil {
+		return nil, err
+	}
+	earliestExitEpoch, err := beaconState.EarliestExitEpoch()
+	if err != nil {
+		return nil, err
+	}
+	consolidationBalanceToConsume, err := beaconState.ConsolidationBalanceToConsume()
+	if err != nil {
+		return nil, err
+	}
+	earliestConsolidationEpoch, err := beaconState.EarliestConsolidationEpoch()
+	if err != nil {
+		return nil, err
+	}
+	pendingDeposits, err := beaconState.PendingDeposits()
+	if err != nil {
+		return nil, err
+	}
+	pendingPartialWithdrawals, err := beaconState.PendingPartialWithdrawals()
+	if err != nil {
+		return nil, err
+	}
+	pendingConsolidations, err := beaconState.PendingConsolidations()
+	if err != nil {
+		return nil, err
+	}
+
+	s := &ethpb.BeaconStateEPBS{
+		GenesisTime:           uint64(beaconState.GenesisTime().Unix()),
+		GenesisValidatorsRoot: beaconState.GenesisValidatorsRoot(),
+		Slot:                  beaconState.Slot(),
+		Fork: &ethpb.Fork{
+			PreviousVersion: beaconState.Fork().CurrentVersion,
+			CurrentVersion:  params.BeaconConfig().EPBSForkVersion,
+			Epoch:           time.CurrentEpoch(beaconState),
+		},
+		LatestBlockHeader:            beaconState.LatestBlockHeader(),
+		BlockRoots:                   beaconState.BlockRoots(),
+		StateRoots:                   beaconState.StateRoots(),
+		HistoricalRoots:              historicalRoots,
+		Eth1Data:                     beaconState.Eth1Data(),
+		Eth1DataVotes:                beaconState.Eth1DataVotes(),
+		Eth1DepositIndex:             beaconState.Eth1DepositIndex(),
+		Validators:                   beaconState.Validators(),
+		Balances:                     beaconState.Balances(),
+		RandaoMixes:                  beaconState.RandaoMixes(),
+		Slashings:                    beaconState.Slashings(),
+		PreviousEpochParticipation:   prevEpochParticipation,
+		CurrentEpochParticipation:    currentEpochParticipation,
+		JustificationBits:            beaconState.JustificationBits(),
+		PreviousJustifiedCheckpoint:  beaconState.PreviousJustifiedCheckpoint(),
+		CurrentJustifiedCheckpoint:   beaconState.CurrentJustifiedCheckpoint(),
+		FinalizedCheckpoint:          beaconState.FinalizedCheckpoint(),
+		InactivityScores:             inactivityScores,
+		CurrentSyncCommittee:         currentSyncCommittee,
+		NextSyncCommittee:            nextSyncCommittee,
+		NextWithdrawalIndex:          wi,
+		NextWithdrawalValidatorIndex: vi,
+		HistoricalSummaries:          summaries,
+
+		DepositRequestsStartIndex:     params.BeaconConfig().UnsetDepositRequestsStartIndex,
+		DepositBalanceToConsume:       depositBalanceToConsume,
+		ExitBalanceToConsume:          exitBalanceToConsume,
+		EarliestExitEpoch:             earliestExitEpoch,
+		ConsolidationBalanceToConsume: consolidationBalanceToConsume,
+		EarliestConsolidationEpoch:    earliestConsolidationEpoch,
+		PendingDeposits:               pendingDeposits,
+		PendingPartialWithdrawals:     pendingPartialWithdrawals,
+		PendingConsolidations:         pendingConsolidations,
+
+		// Newly added for EIP7732
+		LatestExecutionPayloadHeader: &enginev1.ExecutionPayloadHeaderEPBS{
+			ParentBlockHash:        make([]byte, 32),
+			ParentBlockRoot:        make([]byte, 32),
+			BlockHash:              make([]byte, 32),
+			BlobKzgCommitmentsRoot: make([]byte, 32),
+		},
+		LatestBlockHash:       payloadHeader.BlockHash(),
+		LatestFullSlot:        beaconState.Slot(),
+		LatestWithdrawalsRoot: make([]byte, 32),
+	}
+
+	post, err := state_native.InitializeFromProtoUnsafeEpbs(s)
+	if err != nil {
+		return nil, errors.Wrap(err, "failed to initialize post EIP-7732 beaconState")
+	}
+
+	return post, nil
+}

beacon-chain/core/epbs/upgrade_test.go

@@ -0,0 +1,135 @@
+package epbs_test
+
+import (
+	"testing"
+
+	"github.com/OffchainLabs/prysm/v6/beacon-chain/core/epbs"
+	"github.com/OffchainLabs/prysm/v6/beacon-chain/core/helpers"
+	"github.com/OffchainLabs/prysm/v6/beacon-chain/core/time"
+	"github.com/OffchainLabs/prysm/v6/config/params"
+	"github.com/OffchainLabs/prysm/v6/consensus-types/primitives"
+	enginev1 "github.com/OffchainLabs/prysm/v6/proto/engine/v1"
+	ethpb "github.com/OffchainLabs/prysm/v6/proto/prysm/v1alpha1"
+	"github.com/OffchainLabs/prysm/v6/testing/require"
+	"github.com/OffchainLabs/prysm/v6/testing/util"
+	"github.com/OffchainLabs/prysm/v6/time/slots"
+)
+
+func TestUpgradeToEip7732(t *testing.T) {
+	st, _ := util.DeterministicGenesisStateElectra(t, params.BeaconConfig().MaxValidatorsPerCommittee)
+	require.NoError(t, st.SetHistoricalRoots([][]byte{{1}}))
+
+	preForkState := st.Copy()
+	mSt, err := epbs.UpgradeToEIP7732(st)
+	require.NoError(t, err)
+
+	require.Equal(t, preForkState.GenesisTime(), mSt.GenesisTime())
+	require.DeepSSZEqual(t, preForkState.GenesisValidatorsRoot(), mSt.GenesisValidatorsRoot())
+	require.Equal(t, preForkState.Slot(), mSt.Slot())
+	require.DeepSSZEqual(t, preForkState.LatestBlockHeader(), mSt.LatestBlockHeader())
+	require.DeepSSZEqual(t, preForkState.BlockRoots(), mSt.BlockRoots())
+	require.DeepSSZEqual(t, preForkState.StateRoots(), mSt.StateRoots())
+	require.DeepSSZEqual(t, preForkState.Validators()[2:], mSt.Validators()[2:])
+	require.DeepSSZEqual(t, preForkState.Balances()[2:], mSt.Balances()[2:])
+	require.DeepSSZEqual(t, preForkState.Eth1Data(), mSt.Eth1Data())
+	require.DeepSSZEqual(t, preForkState.Eth1DataVotes(), mSt.Eth1DataVotes())
+	require.DeepSSZEqual(t, preForkState.Eth1DepositIndex(), mSt.Eth1DepositIndex())
+	require.DeepSSZEqual(t, preForkState.RandaoMixes(), mSt.RandaoMixes())
+	require.DeepSSZEqual(t, preForkState.Slashings(), mSt.Slashings())
+	require.DeepSSZEqual(t, preForkState.JustificationBits(), mSt.JustificationBits())
+	require.DeepSSZEqual(t, preForkState.PreviousJustifiedCheckpoint(), mSt.PreviousJustifiedCheckpoint())
+	require.DeepSSZEqual(t, preForkState.CurrentJustifiedCheckpoint(), mSt.CurrentJustifiedCheckpoint())
+	require.DeepSSZEqual(t, preForkState.FinalizedCheckpoint(), mSt.FinalizedCheckpoint())
+
+	require.Equal(t, len(preForkState.Validators()), len(mSt.Validators()))
+
+	numValidators := mSt.NumValidators()
+	p, err := mSt.PreviousEpochParticipation()
+	require.NoError(t, err)
+	require.DeepSSZEqual(t, make([]byte, numValidators), p)
+	p, err = mSt.CurrentEpochParticipation()
+	require.NoError(t, err)
+	require.DeepSSZEqual(t, make([]byte, numValidators), p)
+	s, err := mSt.InactivityScores()
+	require.NoError(t, err)
+	require.DeepSSZEqual(t, make([]uint64, numValidators), s)
+
+	hr1, err := preForkState.HistoricalRoots()
+	require.NoError(t, err)
+	hr2, err := mSt.HistoricalRoots()
+	require.NoError(t, err)
+	require.DeepEqual(t, hr1, hr2)
+
+	f := mSt.Fork()
+	require.DeepSSZEqual(t, &ethpb.Fork{
+		PreviousVersion: st.Fork().CurrentVersion,
+		CurrentVersion:  params.BeaconConfig().EPBSForkVersion,
+		Epoch:           time.CurrentEpoch(st),
+	}, f)
+	csc, err := mSt.CurrentSyncCommittee()
+	require.NoError(t, err)
+	psc, err := preForkState.CurrentSyncCommittee()
+	require.NoError(t, err)
+	require.DeepSSZEqual(t, psc, csc)
+	nsc, err := mSt.NextSyncCommittee()
+	require.NoError(t, err)
+	psc, err = preForkState.NextSyncCommittee()
+	require.NoError(t, err)
+	require.DeepSSZEqual(t, psc, nsc)
+
+	nwi, err := mSt.NextWithdrawalIndex()
+	require.NoError(t, err)
+	require.Equal(t, uint64(0), nwi)
+
+	lwvi, err := mSt.NextWithdrawalValidatorIndex()
+	require.NoError(t, err)
+	require.Equal(t, primitives.ValidatorIndex(0), lwvi)
+
+	summaries, err := mSt.HistoricalSummaries()
+	require.NoError(t, err)
+	require.Equal(t, 0, len(summaries))
+
+	startIndex, err := mSt.DepositRequestsStartIndex()
+	require.NoError(t, err)
+	require.Equal(t, params.BeaconConfig().UnsetDepositRequestsStartIndex, startIndex)
+
+	balance, err := mSt.DepositBalanceToConsume()
+	require.NoError(t, err)
+	require.Equal(t, primitives.Gwei(0), balance)
+
+	tab, err := helpers.TotalActiveBalance(mSt)
+	require.NoError(t, err)
+
+	ebtc, err := mSt.ExitBalanceToConsume()
+	require.NoError(t, err)
+	require.Equal(t, helpers.ActivationExitChurnLimit(primitives.Gwei(tab)), ebtc)
+
+	cbtc, err := mSt.ConsolidationBalanceToConsume()
+	require.NoError(t, err)
+	require.Equal(t, helpers.ConsolidationChurnLimit(primitives.Gwei(tab)), cbtc)
+
+	earliestConsolidationEpoch, err := mSt.EarliestConsolidationEpoch()
+	require.NoError(t, err)
+	require.Equal(t, helpers.ActivationExitEpoch(slots.ToEpoch(preForkState.Slot())), earliestConsolidationEpoch)
+
+	// EIP-7732 checks.
+	h, err := mSt.LatestExecutionPayloadHeaderEPBS()
+	require.NoError(t, err)
+	require.DeepEqual(t, &enginev1.ExecutionPayloadHeaderEPBS{
+		ParentBlockHash:        make([]byte, 32),
+		ParentBlockRoot:        make([]byte, 32),
+		BlockHash:              make([]byte, 32),
+		BlobKzgCommitmentsRoot: make([]byte, 32),
+	}, h)
+	lwr, err := mSt.LastWithdrawalsRoot()
+	require.NoError(t, err)
+	require.DeepEqual(t, lwr, make([]byte, 32))
+	lbh, err := mSt.LatestBlockHash()
+	require.NoError(t, err)
+	lh, err := preForkState.LatestExecutionPayloadHeader()
+	require.NoError(t, err)
+	require.DeepEqual(t, lbh, lh.BlockHash())
+	slot, err := mSt.LatestFullSlot()
+	require.NoError(t, err)
+	require.Equal(t, slot, preForkState.Slot())
+}

beacon-chain/core/feed/state/events.go

@@ -33,6 +33,8 @@ const (
 	LightClientOptimisticUpdate
 	// PayloadAttributes events are fired upon a missed slot or new head.
 	PayloadAttributes
+	// PayloadProcessed is fired when a payload is processed.
+	PayloadProcessed
 )
 
 // BlockProcessedData is the data sent with BlockProcessed events.
@@ -53,6 +55,17 @@ type BlockProcessedData struct {
 	Optimistic bool
 }
 
+type PayloadProcessedData struct {
+	// Slot is the slot of the processed block.
+	Slot primitives.Slot
+	// BlockRoot of the processed block.
+	BlockRoot [32]byte
+	// ExecutionBlockHash is the hash of the execution payload.
+	ExecutionBlockHash [32]byte
+	// ExecutionOptimistic is true if the execution payload is optimistic.
+	ExecutionOptimistic bool
+}
+
 // ChainStartedData is the data sent with ChainStarted events.
 type ChainStartedData struct {
 	// StartTime is the time at which the chain started.

beacon-chain/core/helpers/BUILD.bazel

@@ -9,6 +9,7 @@ go_library(
         "genesis.go",
         "legacy.go",
         "metrics.go",
+        "payload_attestation.go",
         "randao.go",
         "rewards_penalties.go",
         "shuffle.go",
@@ -21,11 +22,13 @@ go_library(
     visibility = ["//visibility:public"],
     deps = [
         "//beacon-chain/cache:go_default_library",
+        "//beacon-chain/core/signing:go_default_library",
         "//beacon-chain/core/time:go_default_library",
         "//beacon-chain/forkchoice/types:go_default_library",
         "//beacon-chain/state:go_default_library",
         "//config/fieldparams:go_default_library",
         "//config/params:go_default_library",
+        "//consensus-types/epbs:go_default_library",
         "//consensus-types/primitives:go_default_library",
         "//container/slice:go_default_library",
         "//container/trie:go_default_library",
@@ -52,7 +55,9 @@ go_test(
         "attestation_test.go",
         "beacon_committee_test.go",
         "block_test.go",
+        "exports_test.go",
         "legacy_test.go",
+        "payload_attestation_test.go",
         "private_access_fuzz_noop_test.go",  # keep
         "private_access_test.go",
         "randao_test.go",
@@ -69,21 +74,27 @@ go_test(
     tags = ["CI_race_detection"],
     deps = [
         "//beacon-chain/cache:go_default_library",
+        "//beacon-chain/core/signing:go_default_library",
         "//beacon-chain/core/time:go_default_library",
         "//beacon-chain/forkchoice/types:go_default_library",
         "//beacon-chain/state:go_default_library",
         "//beacon-chain/state/state-native:go_default_library",
         "//config/fieldparams:go_default_library",
         "//config/params:go_default_library",
+        "//consensus-types/epbs:go_default_library",
         "//consensus-types/primitives:go_default_library",
         "//container/slice:go_default_library",
+        "//crypto/bls:go_default_library",
         "//crypto/hash:go_default_library",
+        "//crypto/rand:go_default_library",
         "//encoding/bytesutil:go_default_library",
+        "//math:go_default_library",
         "//proto/prysm/v1alpha1:go_default_library",
         "//runtime/version:go_default_library",
         "//testing/assert:go_default_library",
         "//testing/require:go_default_library",
         "//testing/util:go_default_library",
+        "//testing/util/random:go_default_library",
         "//time:go_default_library",
         "//time/slots:go_default_library",
         "@com_github_prysmaticlabs_go_bitfield//:go_default_library",

beacon-chain/core/helpers/beacon_committee.go

@@ -275,6 +275,7 @@ type CommitteeAssignment struct {
 	Committee      []primitives.ValidatorIndex
 	AttesterSlot   primitives.Slot
 	CommitteeIndex primitives.CommitteeIndex
+	PtcSlot        primitives.Slot
 }
 
 // VerifyAssignmentEpoch verifies if the given epoch is valid for assignment based on the provided state.
@@ -417,7 +418,7 @@ func CommitteeAssignments(ctx context.Context, state state.BeaconState, epoch pr
 	if err := VerifyAssignmentEpoch(epoch, state); err != nil {
 		return nil, err
 	}
-	startSlot, err := slots.EpochStart(epoch)
+	slot, err := slots.EpochStart(epoch)
 	if err != nil {
 		return nil, err
 	}
@@ -426,14 +427,17 @@ func CommitteeAssignments(ctx context.Context, state state.BeaconState, epoch pr
 		vals[v] = struct{}{}
 	}
 	assignments := make(map[primitives.ValidatorIndex]*CommitteeAssignment)
+
+	committees, err := BeaconCommittees(ctx, state, slot)
+	if err != nil {
+		return nil, errors.Wrap(err, "could not compute beacon committees")
+	}
+	ptcPerSlot, ptcMembersPerCommittee := PtcAllocation(len(committees))
 	// Compute committee assignments for each slot in the epoch.
-	for slot := startSlot; slot < startSlot+params.BeaconConfig().SlotsPerEpoch; slot++ {
-		committees, err := BeaconCommittees(ctx, state, slot)
-		if err != nil {
-			return nil, errors.Wrap(err, "could not compute beacon committees")
-		}
+	endSlot := slot + params.BeaconConfig().SlotsPerEpoch
+	for {
 		for j, committee := range committees {
-			for _, vIndex := range committee {
+			for i, vIndex := range committee {
 				if _, ok := vals[vIndex]; !ok { // Skip if the validator is not in the provided validators slice.
 					continue
 				}
@@ -443,8 +447,19 @@ func CommitteeAssignments(ctx context.Context, state state.BeaconState, epoch pr
 				assignments[vIndex].Committee = committee
 				assignments[vIndex].AttesterSlot = slot
 				assignments[vIndex].CommitteeIndex = primitives.CommitteeIndex(j)
+				if uint64(j) < ptcPerSlot && uint64(i) < ptcMembersPerCommittee {
+					assignments[vIndex].PtcSlot = slot
+				}
 			}
 		}
+		slot++
+		if slot == endSlot {
+			break
+		}
+		committees, err = BeaconCommittees(ctx, state, slot)
+		if err != nil {
+			return nil, errors.Wrap(err, "could not compute beacon committees")
+		}
 	}
 	return assignments, nil
 }
@@ -557,7 +572,7 @@ func UpdateProposerIndicesInCache(ctx context.Context, state state.ReadOnlyBeaco
 	}
 	var proposerIndices []primitives.ValidatorIndex
 	// use the state if post fulu (EIP-7917)
-	if state.Version() >= version.Fulu {
+	if state.Version() >= version.Fulu && state.Version() != version.EPBS {
 		lookAhead, err := state.ProposerLookahead()
 		if err != nil {
 			return errors.Wrap(err, "could not get proposer lookahead")

beacon-chain/core/helpers/beacon_committee_test.go

@@ -2,6 +2,7 @@ package helpers_test
 
 import (
 	"fmt"
+	"slices"
 	"strconv"
 	"testing"
 
@@ -730,15 +731,18 @@ func TestCommitteeIndices(t *testing.T) {
 
 func TestAttestationCommitteesFromState(t *testing.T) {
 	ctx := t.Context()
-
-	validators := make([]*ethpb.Validator, params.BeaconConfig().SlotsPerEpoch.Mul(params.BeaconConfig().TargetCommitteeSize))
 	for i := 0; i < len(validators); i++ {
+		k := make([]byte, 48)
+		copy(k, strconv.Itoa(i))
 		validators[i] = &ethpb.Validator{
-			ExitEpoch: params.BeaconConfig().FarFutureEpoch,
+			PublicKey:             k,
+			WithdrawalCredentials: make([]byte, 32),
+			ExitEpoch:             params.BeaconConfig().FarFutureEpoch,
 		}
+		validatorIndices[i] = primitives.ValidatorIndex(i)
 	}
 
-	state, err := state_native.InitializeFromProtoPhase0(&ethpb.BeaconState{
+	state, err := state_native.InitializeFromProtoEpbs(&ethpb.BeaconStateEPBS{
 		Validators:  validators,
 		RandaoMixes: make([][]byte, params.BeaconConfig().EpochsPerHistoricalVector),
 	})
@@ -762,6 +766,31 @@ func TestAttestationCommitteesFromState(t *testing.T) {
 		assert.Equal(t, params.BeaconConfig().TargetCommitteeSize, uint64(len(committees[0])))
 		assert.Equal(t, params.BeaconConfig().TargetCommitteeSize, uint64(len(committees[1])))
 	})
+	as, err := helpers.CommitteeAssignments(context.Background(), state, 1, validatorIndices)
+	require.NoError(t, err)
+
+	// Capture all the slots and all the validator index that belonged in a PTC using a map for verification later.
+	slotValidatorMap := make(map[primitives.Slot][]primitives.ValidatorIndex)
+	for i, a := range as {
+		slotValidatorMap[a.PtcSlot] = append(slotValidatorMap[a.PtcSlot], i)
+	}
+
+	// Verify that all the slots have the correct number of PTC.
+	for s, v := range slotValidatorMap {
+		if s == 0 {
+			continue
+		}
+		// Make sure all the PTC are the correct size from the map.
+		require.Equal(t, len(v), field_params.PTCSize)
+
+		// Get the actual PTC from the beacon state using the helper function
+		ptc, err := helpers.GetPayloadTimelinessCommittee(context.Background(), state, s)
+		require.NoError(t, err)
+		for _, index := range ptc {
+			i := slices.Index(v, index)
+			require.NotEqual(t, -1, i) // PTC not found from the assignment map
+		}
+	}
 }
 
 func TestAttestationCommitteesFromCache(t *testing.T) {

beacon-chain/core/helpers/exports_test.go

@@ -0,0 +1,12 @@
+package helpers
+
+var (
+	ErrNilMessage            = errNilMessage
+	ErrNilData               = errNilData
+	ErrNilBeaconBlockRoot    = errNilBeaconBlockRoot
+	ErrNilPayloadAttestation = errNilPayloadAttestation
+	ErrNilSignature          = errNilSignature
+	ErrNilAggregationBits    = errNilAggregationBits
+	ErrPreEPBSState          = errPreEPBSState
+	ErrCommitteeOverflow     = errCommitteeOverflow
+)

beacon-chain/core/helpers/payload_attestation.go

@@ -0,0 +1,296 @@
+package helpers
+
+import (
+	"context"
+	"slices"
+
+	"github.com/OffchainLabs/prysm/v6/beacon-chain/core/signing"
+	"github.com/OffchainLabs/prysm/v6/beacon-chain/state"
+	fieldparams "github.com/OffchainLabs/prysm/v6/config/fieldparams"
+	"github.com/OffchainLabs/prysm/v6/config/params"
+	"github.com/OffchainLabs/prysm/v6/consensus-types/epbs"
+	"github.com/OffchainLabs/prysm/v6/consensus-types/primitives"
+	"github.com/OffchainLabs/prysm/v6/crypto/bls"
+	"github.com/OffchainLabs/prysm/v6/math"
+	eth "github.com/OffchainLabs/prysm/v6/proto/prysm/v1alpha1"
+	"github.com/OffchainLabs/prysm/v6/runtime/version"
+	"github.com/OffchainLabs/prysm/v6/time/slots"
+	"github.com/pkg/errors"
+)
+
+var (
+	errNilMessage            = errors.New("nil PayloadAttestationMessage")
+	errNilData               = errors.New("nil PayloadAttestationData")
+	errNilBeaconBlockRoot    = errors.New("nil BeaconBlockRoot")
+	errNilPayloadAttestation = errors.New("nil PayloadAttestation")
+	errNilSignature          = errors.New("nil Signature")
+	errNilAggregationBits    = errors.New("nil AggregationBits")
+	errPreEPBSState          = errors.New("beacon state pre ePBS fork")
+	errCommitteeOverflow     = errors.New("beacon committee of insufficient size")
+)
+
+// ValidateNilPayloadAttestationData checks if any composite field of the
+// payload attestation data is nil
+func ValidateNilPayloadAttestationData(data *eth.PayloadAttestationData) error {
+	if data == nil {
+		return errNilData
+	}
+	if data.BeaconBlockRoot == nil {
+		return errNilBeaconBlockRoot
+	}
+	return nil
+}
+
+// ValidateNilPayloadAttestationMessage checks if any composite field of the
+// payload attestation message is nil
+func ValidateNilPayloadAttestationMessage(att *eth.PayloadAttestationMessage) error {
+	if att == nil {
+		return errNilMessage
+	}
+	if att.Signature == nil {
+		return errNilSignature
+	}
+	return ValidateNilPayloadAttestationData(att.Data)
+}
+
+// ValidateNilPayloadAttestation checks if any composite field of the
+// payload attestation is nil
+func ValidateNilPayloadAttestation(att *eth.PayloadAttestation) error {
+	if att == nil {
+		return errNilPayloadAttestation
+	}
+	if att.AggregationBits == nil {
+		return errNilAggregationBits
+	}
+	if att.Signature == nil {
+		return errNilSignature
+	}
+	return ValidateNilPayloadAttestationData(att.Data)
+}
+
+// InPayloadTimelinessCommittee returns whether the given index belongs to the
+// PTC computed from the passed state.
+func InPayloadTimelinessCommittee(ctx context.Context, state state.ReadOnlyBeaconState, slot primitives.Slot, idx primitives.ValidatorIndex) (bool, error) {
+	ptc, err := GetPayloadTimelinessCommittee(ctx, state, slot)
+	if err != nil {
+		return false, err
+	}
+	for _, i := range ptc {
+		if i == idx {
+			return true, nil
+		}
+	}
+	return false, nil
+}
+
+// GetPayloadTimelinessCommittee returns the PTC for the given slot, computed from the passed state as in the
+// spec function `get_ptc`.
+func GetPayloadTimelinessCommittee(ctx context.Context, state state.ReadOnlyBeaconState, slot primitives.Slot) (indices []primitives.ValidatorIndex, err error) {
+	if state.Version() < version.EPBS {
+		return nil, errPreEPBSState
+	}
+	committees, err := BeaconCommittees(ctx, state, slot)
+	if err != nil {
+		return nil, errors.Wrap(err, "could not get beacon committees")
+	}
+	committeesPerSlot, membersPerCommittee := PtcAllocation(len(committees))
+	for i, committee := range committees {
+		if uint64(i) >= committeesPerSlot {
+			return
+		}
+		if uint64(len(committee)) < membersPerCommittee {
+			return nil, errCommitteeOverflow
+		}
+		indices = append(indices, committee[:membersPerCommittee]...)
+	}
+	return
+}
+
+// PtcAllocation returns:
+// 1. The number of beacon committees that PTC will borrow from in a slot.
+// 2. The number of validators that PTC will borrow from in a beacon committee.
+func PtcAllocation(slotCommittees int) (committeesPerSlot, membersPerCommittee uint64) {
+	committeesPerSlot = math.LargestPowerOfTwo(math.Min(uint64(slotCommittees), fieldparams.PTCSize))
+	membersPerCommittee = fieldparams.PTCSize / committeesPerSlot
+	return
+}
+
+// GetPayloadAttestingIndices returns the set of attester indices corresponding to the given PayloadAttestation.
+//
+// Spec pseudocode definition:
+//
+//	def get_payload_attesting_indices(state: BeaconState, slot: Slot,
+//		payload_attestation: PayloadAttestation) -> Set[ValidatorIndex]:
+//	"""
+//	Return the set of attesting indices corresponding to ``payload_attestation``.
+//	"""
+//	ptc = get_ptc(state, slot)
+//	return set(index for i, index in enumerate(ptc) if payload_attestation.aggregation_bits[i])
+func GetPayloadAttestingIndices(ctx context.Context, state state.ReadOnlyBeaconState, slot primitives.Slot, att *eth.PayloadAttestation) (indices []primitives.ValidatorIndex, err error) {
+	if state.Version() < version.EPBS {
+		return nil, errPreEPBSState
+	}
+
+	ptc, err := GetPayloadTimelinessCommittee(ctx, state, slot)
+	if err != nil {
+		return nil, err
+	}
+
+	for i, validatorIndex := range ptc {
+		if att.AggregationBits.BitAt(uint64(i)) {
+			indices = append(indices, validatorIndex)
+		}
+	}
+
+	return
+}
+
+// GetIndexedPayloadAttestation replaces a PayloadAttestation's AggregationBits with sorted AttestingIndices and returns an IndexedPayloadAttestation.
+//
+// Spec pseudocode definition:
+//
+//	def get_indexed_payload_attestation(state: BeaconState, slot: Slot,
+//		payload_attestation: PayloadAttestation) -> IndexedPayloadAttestation:
+//	"""
+//	Return the indexed payload attestation corresponding to ``payload_attestation``.
+//	"""
+//	attesting_indices = get_payload_attesting_indices(state, slot, payload_attestation)
+//
+//	return IndexedPayloadAttestation(
+//	attesting_indices=sorted(attesting_indices),
+//	data=payload_attestation.data,
+//	signature=payload_attestation.signature,
+//	)
+func GetIndexedPayloadAttestation(ctx context.Context, state state.ReadOnlyBeaconState, slot primitives.Slot, att *eth.PayloadAttestation) (*epbs.IndexedPayloadAttestation, error) {
+	if state.Version() < version.EPBS {
+		return nil, errPreEPBSState
+	}
+
+	attestingIndices, err := GetPayloadAttestingIndices(ctx, state, slot, att)
+	if err != nil {
+		return nil, err
+	}
+
+	slices.Sort(attestingIndices)
+
+	return &epbs.IndexedPayloadAttestation{
+		AttestingIndices: attestingIndices,
+		Data:             att.Data,
+		Signature:        att.Signature,
+	}, nil
+}
+
+// IsValidIndexedPayloadAttestation validates the given IndexedPayloadAttestation.
+//
+// Spec pseudocode definition:
+//
+//	def is_valid_indexed_payload_attestation(
+//		state: BeaconState,
+//		indexed_payload_attestation: IndexedPayloadAttestation) -> bool:
+//	"""
+//	Check if ``indexed_payload_attestation`` is not empty, has sorted and unique indices and has
+//	a valid aggregate signature.
+//	"""
+//	# Verify the data is valid
+//	if indexed_payload_attestation.data.payload_status >= PAYLOAD_INVALID_STATUS:
+//		return False
+//
+//	# Verify indices are sorted and unique
+//	indices = indexed_payload_attestation.attesting_indices
+//	if len(indices) == 0 or not indices == sorted(set(indices)):
+//		return False
+//
+//	# Verify aggregate signature
+//	pubkeys = [state.validators[i].pubkey for i in indices]
+//	domain = get_domain(state, DOMAIN_PTC_ATTESTER, None)
+//	signing_root = compute_signing_root(indexed_payload_attestation.data, domain)
+//	return bls.FastAggregateVerify(pubkeys, signing_root, indexed_payload_attestation.signature)
+func IsValidIndexedPayloadAttestation(state state.ReadOnlyBeaconState, att *epbs.IndexedPayloadAttestation) (bool, error) {
+	if state.Version() < version.EPBS {
+		return false, errPreEPBSState
+	}
+
+	// Verify the data is valid.
+	if primitives.PTCStatus(att.Data.PayloadStatus[0]) >= primitives.PAYLOAD_INVALID_STATUS {
+		return false, nil
+	}
+
+	// Verify indices are sorted and unique.
+	indices := att.AttestingIndices
+	slices.Sort(indices)
+	if len(indices) == 0 || !slices.Equal(att.AttestingIndices, indices) {
+		return false, nil
+	}
+
+	// Verify aggregate signature.
+	publicKeys := make([]bls.PublicKey, len(indices))
+	for i, index := range indices {
+		validator, err := state.ValidatorAtIndexReadOnly(index)
+		if err != nil {
+			return false, err
+		}
+
+		publicKeyBytes := validator.PublicKey()
+		publicKey, err := bls.PublicKeyFromBytes(publicKeyBytes[:])
+		if err != nil {
+			return false, err
+		}
+
+		publicKeys[i] = publicKey
+	}
+
+	domain, err := signing.Domain(
+		state.Fork(),
+		slots.ToEpoch(state.Slot()),
+		params.BeaconConfig().DomainPTCAttester,
+		state.GenesisValidatorsRoot(),
+	)
+	if err != nil {
+		return false, err
+	}
+
+	signingRoot, err := signing.ComputeSigningRoot(att.Data, domain)
+	if err != nil {
+		return false, err
+	}
+
+	signature, err := bls.SignatureFromBytes(att.Signature)
+	if err != nil {
+		return false, err
+	}
+
+	return signature.FastAggregateVerify(publicKeys, signingRoot), nil
+}
+
+// ValidatePayloadAttestationMessageSignature verifies the signature of a
+// payload attestation message.
+func ValidatePayloadAttestationMessageSignature(ctx context.Context, st state.ReadOnlyBeaconState, msg *eth.PayloadAttestationMessage) error {
+	if err := ValidateNilPayloadAttestationMessage(msg); err != nil {
+		return err
+	}
+	val, err := st.ValidatorAtIndex(msg.ValidatorIndex)
+	if err != nil {
+		return err
+	}
+	pub, err := bls.PublicKeyFromBytes(val.PublicKey)
+	if err != nil {
+		return err
+	}
+	sig, err := bls.SignatureFromBytes(msg.Signature)
+	if err != nil {
+		return err
+	}
+	currentEpoch := slots.ToEpoch(st.Slot())
+	domain, err := signing.Domain(st.Fork(), currentEpoch, params.BeaconConfig().DomainPTCAttester, st.GenesisValidatorsRoot())
+	if err != nil {
+		return err
+	}
+	root, err := signing.ComputeSigningRoot(msg.Data, domain)
+	if err != nil {
+		return err
+	}
+	if !sig.Verify(pub, root[:]) {
+		return signing.ErrSigFailedToVerify
+	}
+	return nil
+}

beacon-chain/core/helpers/payload_attestation_test.go

@@ -0,0 +1,363 @@
+package helpers_test
+
+import (
+	"context"
+	"slices"
+	"strconv"
+	"testing"
+
+	"github.com/OffchainLabs/prysm/v6/beacon-chain/core/helpers"
+	"github.com/OffchainLabs/prysm/v6/beacon-chain/core/signing"
+	state_native "github.com/OffchainLabs/prysm/v6/beacon-chain/state/state-native"
+	fieldparams "github.com/OffchainLabs/prysm/v6/config/fieldparams"
+	"github.com/OffchainLabs/prysm/v6/config/params"
+	"github.com/OffchainLabs/prysm/v6/consensus-types/epbs"
+	"github.com/OffchainLabs/prysm/v6/consensus-types/primitives"
+	"github.com/OffchainLabs/prysm/v6/crypto/bls"
+	"github.com/OffchainLabs/prysm/v6/crypto/rand"
+	"github.com/OffchainLabs/prysm/v6/math"
+	eth "github.com/OffchainLabs/prysm/v6/proto/prysm/v1alpha1"
+	ethpb "github.com/OffchainLabs/prysm/v6/proto/prysm/v1alpha1"
+	"github.com/OffchainLabs/prysm/v6/testing/require"
+	"github.com/OffchainLabs/prysm/v6/testing/util"
+	"github.com/OffchainLabs/prysm/v6/testing/util/random"
+	"github.com/OffchainLabs/prysm/v6/time/slots"
+	"github.com/prysmaticlabs/go-bitfield"
+)
+
+func TestValidateNilPayloadAttestation(t *testing.T) {
+	require.ErrorIs(t, helpers.ErrNilData, helpers.ValidateNilPayloadAttestationData(nil))
+	data := &eth.PayloadAttestationData{}
+	require.ErrorIs(t, helpers.ErrNilBeaconBlockRoot, helpers.ValidateNilPayloadAttestationData(data))
+	data.BeaconBlockRoot = make([]byte, 32)
+	require.NoError(t, helpers.ValidateNilPayloadAttestationData(data))
+
+	require.ErrorIs(t, helpers.ErrNilMessage, helpers.ValidateNilPayloadAttestationMessage(nil))
+	message := &eth.PayloadAttestationMessage{}
+	require.ErrorIs(t, helpers.ErrNilSignature, helpers.ValidateNilPayloadAttestationMessage(message))
+	message.Signature = make([]byte, 96)
+	require.ErrorIs(t, helpers.ErrNilData, helpers.ValidateNilPayloadAttestationMessage(message))
+	message.Data = data
+	require.NoError(t, helpers.ValidateNilPayloadAttestationMessage(message))
+
+	require.ErrorIs(t, helpers.ErrNilPayloadAttestation, helpers.ValidateNilPayloadAttestation(nil))
+	att := &eth.PayloadAttestation{}
+	require.ErrorIs(t, helpers.ErrNilAggregationBits, helpers.ValidateNilPayloadAttestation(att))
+	att.AggregationBits = bitfield.NewBitvector512()
+	require.ErrorIs(t, helpers.ErrNilSignature, helpers.ValidateNilPayloadAttestation(att))
+	att.Signature = message.Signature
+	require.ErrorIs(t, helpers.ErrNilData, helpers.ValidateNilPayloadAttestation(att))
+	att.Data = data
+	require.NoError(t, helpers.ValidateNilPayloadAttestation(att))
+}
+
+func TestGetPayloadTimelinessCommittee(t *testing.T) {
+	helpers.ClearCache()
+
+	// Create 10 committees
+	committeeCount := uint64(10)
+	validatorCount := committeeCount * params.BeaconConfig().TargetCommitteeSize * uint64(params.BeaconConfig().SlotsPerEpoch)
+	validators := make([]*ethpb.Validator, validatorCount)
+
+	for i := 0; i < len(validators); i++ {
+		k := make([]byte, 48)
+		copy(k, strconv.Itoa(i))
+		validators[i] = &ethpb.Validator{
+			PublicKey:             k,
+			WithdrawalCredentials: make([]byte, 32),
+			ExitEpoch:             params.BeaconConfig().FarFutureEpoch,
+		}
+	}
+
+	state, err := state_native.InitializeFromProtoEpbs(random.BeaconState(t))
+	require.NoError(t, err)
+	require.NoError(t, state.SetValidators(validators))
+	require.NoError(t, state.SetSlot(200))
+
+	ctx := context.Background()
+	indices, err := helpers.BeaconCommitteeFromState(ctx, state, state.Slot(), 1)
+	require.NoError(t, err)
+	require.Equal(t, 128, len(indices))
+
+	epoch := slots.ToEpoch(state.Slot())
+	activeCount, err := helpers.ActiveValidatorCount(ctx, state, epoch)
+	require.NoError(t, err)
+	require.Equal(t, uint64(40960), activeCount)
+
+	computedCommitteeCount := helpers.SlotCommitteeCount(activeCount)
+	require.Equal(t, committeeCount, computedCommitteeCount)
+	committeesPerSlot := math.LargestPowerOfTwo(math.Min(committeeCount, fieldparams.PTCSize))
+	require.Equal(t, uint64(8), committeesPerSlot)
+
+	ptc, err := helpers.GetPayloadTimelinessCommittee(ctx, state, state.Slot())
+	require.NoError(t, err)
+	require.Equal(t, fieldparams.PTCSize, len(ptc))
+
+	committee1, err := helpers.BeaconCommitteeFromState(ctx, state, state.Slot(), 0)
+	require.NoError(t, err)
+
+	require.DeepEqual(t, committee1[:64], ptc[:64])
+}
+
+func Test_PtcAllocation(t *testing.T) {
+	tests := []struct {
+		committeeCount     int
+		memberPerCommittee uint64
+		committeesPerSlot  uint64
+	}{
+		{1, 512, 1},
+		{4, 128, 4},
+		{128, 4, 128},
+		{512, 1, 512},
+		{1024, 1, 512},
+	}
+
+	for _, test := range tests {
+		committeesPerSlot, memberPerCommittee := helpers.PtcAllocation(test.committeeCount)
+		if memberPerCommittee != test.memberPerCommittee {
+			t.Errorf("memberPerCommittee(%d) = %d; expected %d", test.committeeCount, memberPerCommittee, test.memberPerCommittee)
+		}
+		if committeesPerSlot != test.committeesPerSlot {
+			t.Errorf("committeesPerSlot(%d) = %d; expected %d", test.committeeCount, committeesPerSlot, test.committeesPerSlot)
+		}
+	}
+}
+
+func TestGetPayloadAttestingIndices(t *testing.T) {
+	helpers.ClearCache()
+
+	// Create 10 committees. Total 40960 validators.
+	committeeCount := uint64(10)
+	validatorCount := committeeCount * params.BeaconConfig().TargetCommitteeSize * uint64(params.BeaconConfig().SlotsPerEpoch)
+	validators := make([]*ethpb.Validator, validatorCount)
+
+	for i := 0; i < len(validators); i++ {
+		pubkey := make([]byte, 48)
+		copy(pubkey, strconv.Itoa(i))
+		validators[i] = &ethpb.Validator{
+			PublicKey:             pubkey,
+			WithdrawalCredentials: make([]byte, 32),
+			ExitEpoch:             params.BeaconConfig().FarFutureEpoch,
+		}
+	}
+
+	// Create a beacon state.
+	state, err := state_native.InitializeFromProtoEpbs(&ethpb.BeaconStateEPBS{
+		Validators:  validators,
+		RandaoMixes: make([][]byte, params.BeaconConfig().EpochsPerHistoricalVector),
+	})
+	require.NoError(t, err)
+
+	// Get PTC.
+	ptc, err := helpers.GetPayloadTimelinessCommittee(context.Background(), state, state.Slot())
+	require.NoError(t, err)
+	require.Equal(t, fieldparams.PTCSize, len(ptc))
+
+	// Generate random indices. PTC members at the corresponding indices are considered attested.
+	randGen := rand.NewDeterministicGenerator()
+	attesterCount := randGen.Intn(fieldparams.PTCSize) + 1
+	indices := randGen.Perm(fieldparams.PTCSize)[:attesterCount]
+	slices.Sort(indices)
+	require.Equal(t, attesterCount, len(indices))
+
+	// Create a PayloadAttestation with AggregationBits set true at the indices.
+	aggregationBits := bitfield.NewBitvector512()
+	for _, index := range indices {
+		aggregationBits.SetBitAt(uint64(index), true)
+	}
+
+	payloadAttestation := &eth.PayloadAttestation{
+		AggregationBits: aggregationBits,
+		Data: &eth.PayloadAttestationData{
+			BeaconBlockRoot: make([]byte, 32),
+		},
+		Signature: make([]byte, 96),
+	}
+
+	// Get attesting indices.
+	attesters, err := helpers.GetPayloadAttestingIndices(context.Background(), state, state.Slot(), payloadAttestation)
+	require.NoError(t, err)
+	require.Equal(t, len(indices), len(attesters))
+
+	// Check if each attester equals to the PTC member at the corresponding index.
+	for i, index := range indices {
+		require.Equal(t, attesters[i], ptc[index])
+	}
+}
+
+func TestGetIndexedPayloadAttestation(t *testing.T) {
+	helpers.ClearCache()
+
+	// Create 10 committees. Total 40960 validators.
+	committeeCount := uint64(10)
+	validatorCount := committeeCount * params.BeaconConfig().TargetCommitteeSize * uint64(params.BeaconConfig().SlotsPerEpoch)
+	validators := make([]*ethpb.Validator, validatorCount)
+
+	for i := 0; i < len(validators); i++ {
+		publicKey := make([]byte, 48)
+		copy(publicKey, strconv.Itoa(i))
+		validators[i] = &ethpb.Validator{
+			PublicKey:             publicKey,
+			WithdrawalCredentials: make([]byte, 32),
+			ExitEpoch:             params.BeaconConfig().FarFutureEpoch,
+		}
+	}
+
+	// Create a beacon state.
+	state, err := state_native.InitializeFromProtoEpbs(&ethpb.BeaconStateEPBS{
+		Validators:  validators,
+		RandaoMixes: make([][]byte, params.BeaconConfig().EpochsPerHistoricalVector),
+	})
+	require.NoError(t, err)
+
+	// Get PTC.
+	ptc, err := helpers.GetPayloadTimelinessCommittee(context.Background(), state, state.Slot())
+	require.NoError(t, err)
+	require.Equal(t, fieldparams.PTCSize, len(ptc))
+
+	// Generate random indices. PTC members at the corresponding indices are considered attested.
+	randGen := rand.NewDeterministicGenerator()
+	attesterCount := randGen.Intn(fieldparams.PTCSize) + 1
+	indices := randGen.Perm(fieldparams.PTCSize)[:attesterCount]
+	slices.Sort(indices)
+	require.Equal(t, attesterCount, len(indices))
+
+	// Create a PayloadAttestation with AggregationBits set true at the indices.
+	aggregationBits := bitfield.NewBitvector512()
+	for _, index := range indices {
+		aggregationBits.SetBitAt(uint64(index), true)
+	}
+
+	payloadAttestation := &eth.PayloadAttestation{
+		AggregationBits: aggregationBits,
+		Data: &eth.PayloadAttestationData{
+			BeaconBlockRoot: make([]byte, 32),
+		},
+		Signature: make([]byte, 96),
+	}
+
+	// Get attesting indices.
+	ctx := context.Background()
+	attesters, err := helpers.GetPayloadAttestingIndices(ctx, state, state.Slot(), payloadAttestation)
+	require.NoError(t, err)
+	require.Equal(t, len(indices), len(attesters))
+
+	// Get an IndexedPayloadAttestation.
+	indexedPayloadAttestation, err := helpers.GetIndexedPayloadAttestation(ctx, state, state.Slot(), payloadAttestation)
+	require.NoError(t, err)
+	require.Equal(t, len(indices), len(indexedPayloadAttestation.AttestingIndices))
+	require.DeepEqual(t, payloadAttestation.Data, indexedPayloadAttestation.Data)
+	require.DeepEqual(t, payloadAttestation.Signature, indexedPayloadAttestation.Signature)
+
+	// Check if the attesting indices are the same.
+	slices.Sort(attesters) // GetIndexedPayloadAttestation sorts attesting indices.
+	require.DeepEqual(t, attesters, indexedPayloadAttestation.AttestingIndices)
+}
+
+func TestIsValidIndexedPayloadAttestation(t *testing.T) {
+	helpers.ClearCache()
+
+	// Create validators.
+	validatorCount := uint64(350)
+	validators := make([]*ethpb.Validator, validatorCount)
+	_, secretKeys, err := util.DeterministicDepositsAndKeys(validatorCount)
+	require.NoError(t, err)
+
+	for i := 0; i < len(validators); i++ {
+		validators[i] = &ethpb.Validator{
+			PublicKey:             secretKeys[i].PublicKey().Marshal(),
+			WithdrawalCredentials: make([]byte, 32),
+			ExitEpoch:             params.BeaconConfig().FarFutureEpoch,
+		}
+	}
+
+	// Create a beacon state.
+	state, err := state_native.InitializeFromProtoEpbs(&ethpb.BeaconStateEPBS{
+		Validators: validators,
+		Fork: &ethpb.Fork{
+			Epoch:           0,
+			CurrentVersion:  params.BeaconConfig().GenesisForkVersion,
+			PreviousVersion: params.BeaconConfig().GenesisForkVersion,
+		},
+		RandaoMixes: make([][]byte, params.BeaconConfig().EpochsPerHistoricalVector),
+	})
+	require.NoError(t, err)
+
+	// Define test cases.
+	tests := []struct {
+		attestation *epbs.IndexedPayloadAttestation
+	}{
+		{
+			attestation: &epbs.IndexedPayloadAttestation{
+				AttestingIndices: []primitives.ValidatorIndex{1},
+				Data: &eth.PayloadAttestationData{
+					BeaconBlockRoot: make([]byte, fieldparams.RootLength),
+				},
+				Signature: make([]byte, fieldparams.BLSSignatureLength),
+			},
+		},
+		{
+			attestation: &epbs.IndexedPayloadAttestation{
+				AttestingIndices: []primitives.ValidatorIndex{13, 19},
+				Data: &eth.PayloadAttestationData{
+					BeaconBlockRoot: make([]byte, fieldparams.RootLength),
+				},
+				Signature: make([]byte, fieldparams.BLSSignatureLength),
+			},
+		},
+		{
+			attestation: &epbs.IndexedPayloadAttestation{
+				AttestingIndices: []primitives.ValidatorIndex{123, 234, 345},
+				Data: &eth.PayloadAttestationData{
+					BeaconBlockRoot: make([]byte, fieldparams.RootLength),
+				},
+				Signature: make([]byte, fieldparams.BLSSignatureLength),
+			},
+		},
+		{
+			attestation: &epbs.IndexedPayloadAttestation{
+				AttestingIndices: []primitives.ValidatorIndex{38, 46, 54, 62, 70, 78, 86, 194},
+				Data: &eth.PayloadAttestationData{
+					BeaconBlockRoot: make([]byte, fieldparams.RootLength),
+				},
+				Signature: make([]byte, fieldparams.BLSSignatureLength),
+			},
+		},
+		{
+			attestation: &epbs.IndexedPayloadAttestation{
+				AttestingIndices: []primitives.ValidatorIndex{5},
+				Data: &eth.PayloadAttestationData{
+					BeaconBlockRoot: make([]byte, fieldparams.RootLength),
+				},
+				Signature: make([]byte, fieldparams.BLSSignatureLength),
+			},
+		},
+	}
+
+	// Run test cases.
+	for _, test := range tests {
+		signatures := make([]bls.Signature, len(test.attestation.AttestingIndices))
+		for i, index := range test.attestation.AttestingIndices {
+			signedBytes, err := signing.ComputeDomainAndSign(
+				state,
+				slots.ToEpoch(test.attestation.Data.Slot),
+				test.attestation.Data,
+				params.BeaconConfig().DomainPTCAttester,
+				secretKeys[index],
+			)
+			require.NoError(t, err)
+
+			signature, err := bls.SignatureFromBytes(signedBytes)
+			require.NoError(t, err)
+
+			signatures[i] = signature
+		}
+
+		aggregatedSignature := bls.AggregateSignatures(signatures)
+		test.attestation.Signature = aggregatedSignature.Marshal()
+
+		isValid, err := helpers.IsValidIndexedPayloadAttestation(state, test.attestation)
+		require.NoError(t, err)
+		require.Equal(t, true, isValid)
+	}
+}

beacon-chain/core/helpers/validators.go

@@ -319,7 +319,7 @@ func beaconProposerIndexAtSlotFulu(state state.ReadOnlyBeaconState, slot primiti
 // BeaconProposerIndexAtSlot returns proposer index at the given slot from the
 // point of view of the given state as head state
 func BeaconProposerIndexAtSlot(ctx context.Context, state state.ReadOnlyBeaconState, slot primitives.Slot) (primitives.ValidatorIndex, error) {
-	if state.Version() >= version.Fulu {
+	if state.Version() >= version.Fulu && state.Version() != version.EPBS {
 		return beaconProposerIndexAtSlotFulu(state, slot)
 	}
 	e := slots.ToEpoch(slot)

beacon-chain/core/time/BUILD.bazel

@@ -2,7 +2,10 @@ load("@prysm//tools/go:def.bzl", "go_library", "go_test")
 
 go_library(
     name = "go_default_library",
-    srcs = ["slot_epoch.go"],
+    srcs = [
+        "slot_epoch.go",
+        "slot_epoch_epbs.go",
+    ],
     importpath = "github.com/OffchainLabs/prysm/v6/beacon-chain/core/time",
     visibility = ["//visibility:public"],
     deps = [

beacon-chain/core/time/slot_epoch_epbs.go

@@ -0,0 +1,15 @@
+package time
+
+import (
+	"github.com/OffchainLabs/prysm/v6/config/params"
+	"github.com/OffchainLabs/prysm/v6/consensus-types/primitives"
+	"github.com/OffchainLabs/prysm/v6/time/slots"
+)
+
+// CanUpgradeToEip7732 returns true if the input `slot` can upgrade to EIP-7732(epbs).
+// Spec code:
+// If state.slot % SLOTS_PER_EPOCH == 0 and compute_epoch_at_slot(state.slot) == EIP7732_FORK_EPOCH
+func CanUpgradeToEip7732(slot primitives.Slot) bool {
+	epochStart := slots.IsEpochStart(slot)
+	return epochStart && slots.ToEpoch(slot) == params.BeaconConfig().EPBSForkEpoch
+}

beacon-chain/core/time/slot_epoch_test.go

@@ -233,6 +233,11 @@ func TestCanUpgradeTo(t *testing.T) {
 			forkEpoch:   &beaconConfig.FuluForkEpoch,
 			upgradeFunc: time.CanUpgradeToFulu,
 		},
+		{
+			name:        "Eip7732",
+			forkEpoch:   &beaconConfig.EPBSForkEpoch,
+			upgradeFunc: time.CanUpgradeToEip7732,
+		},
 	}
 
 	for _, otc := range outerTestCases {

beacon-chain/core/transition/BUILD.bazel

@@ -9,6 +9,7 @@ go_library(
         "state-bellatrix.go",
         "trailing_slot_state_cache.go",
         "transition.go",
+        "transition_epbs.go",
         "transition_no_verify_sig.go",
     ],
     importpath = "github.com/OffchainLabs/prysm/v6/beacon-chain/core/transition",
@@ -20,13 +21,13 @@ go_library(
         "//beacon-chain/core/capella:go_default_library",
         "//beacon-chain/core/deneb:go_default_library",
         "//beacon-chain/core/electra:go_default_library",
+        "//beacon-chain/core/epbs:go_default_library",
         "//beacon-chain/core/epoch:go_default_library",
         "//beacon-chain/core/epoch/precompute:go_default_library",
         "//beacon-chain/core/execution:go_default_library",
         "//beacon-chain/core/fulu: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",

beacon-chain/core/transition/interop/BUILD.bazel

@@ -14,7 +14,6 @@ go_library(
     ],
     deps = [
         "//beacon-chain/state:go_default_library",
-        "//config/features:go_default_library",
         "//consensus-types/interfaces:go_default_library",
         "//io/file:go_default_library",
         "@com_github_sirupsen_logrus//:go_default_library",

beacon-chain/core/transition/interop/write_block_to_disk.go

@@ -5,17 +5,12 @@ import (
 	"os"
 	"path"
 
-	"github.com/OffchainLabs/prysm/v6/config/features"
 	"github.com/OffchainLabs/prysm/v6/consensus-types/interfaces"
 	"github.com/OffchainLabs/prysm/v6/io/file"
 )
 
 // WriteBlockToDisk as a block ssz. Writes to temp directory. Debug!
 func WriteBlockToDisk(block interfaces.ReadOnlySignedBeaconBlock, failed bool) {
-	if !features.Get().WriteSSZStateTransitions {
-		return
-	}
-
 	filename := fmt.Sprintf("beacon_block_%d.ssz", block.Block().Slot())
 	if failed {
 		filename = "failed_" + filename

beacon-chain/core/transition/interop/write_state_to_disk.go

@@ -6,15 +6,11 @@ import (
 	"path"
 
 	"github.com/OffchainLabs/prysm/v6/beacon-chain/state"
-	"github.com/OffchainLabs/prysm/v6/config/features"
 	"github.com/OffchainLabs/prysm/v6/io/file"
 )
 
 // WriteStateToDisk as a state ssz. Writes to temp directory. Debug!
 func WriteStateToDisk(state state.ReadOnlyBeaconState) {
-	if !features.Get().WriteSSZStateTransitions {
-		return
-	}
 	fp := path.Join(os.TempDir(), fmt.Sprintf("beacon_state_%d.ssz", state.Slot()))
 	log.Warnf("Writing state to disk at %s", fp)
 	enc, err := state.MarshalSSZ()

beacon-chain/core/transition/transition.go

@@ -13,6 +13,7 @@ import (
 	"github.com/OffchainLabs/prysm/v6/beacon-chain/core/capella"
 	"github.com/OffchainLabs/prysm/v6/beacon-chain/core/deneb"
 	"github.com/OffchainLabs/prysm/v6/beacon-chain/core/electra"
+	"github.com/OffchainLabs/prysm/v6/beacon-chain/core/epbs"
 	e "github.com/OffchainLabs/prysm/v6/beacon-chain/core/epoch"
 	"github.com/OffchainLabs/prysm/v6/beacon-chain/core/epoch/precompute"
 	"github.com/OffchainLabs/prysm/v6/beacon-chain/core/execution"
@@ -303,7 +304,7 @@ func ProcessSlotsCore(ctx context.Context, span trace.Span, state state.BeaconSt
 func ProcessEpoch(ctx context.Context, state state.BeaconState) (state.BeaconState, error) {
 	var err error
 	if time.CanProcessEpoch(state) {
-		if state.Version() >= version.Fulu {
+		if state.Version() >= version.Fulu && state.Version() != version.EPBS {
 			if err = fulu.ProcessEpoch(ctx, state); err != nil {
 				return nil, errors.Wrap(err, fmt.Sprintf("could not process %s epoch", version.String(state.Version())))
 			}
@@ -389,6 +390,15 @@ func UpgradeState(ctx context.Context, state state.BeaconState) (state.BeaconSta
 		upgraded = true
 	}
 
+	if time.CanUpgradeToEip7732(slot) {
+		state, err = epbs.UpgradeToEIP7732(state)
+		if err != nil {
+			tracing.AnnotateError(span, err)
+			return nil, err
+		}
+		upgraded = true
+	}
+
 	if upgraded {
 		log.WithField("version", version.String(state.Version())).Info("Upgraded state to")
 	}

beacon-chain/core/transition/transition_epbs.go

@@ -0,0 +1,111 @@
+package transition
+
+import (
+	"fmt"
+
+	"github.com/OffchainLabs/prysm/v6/beacon-chain/core/blocks"
+	"github.com/OffchainLabs/prysm/v6/beacon-chain/core/epbs"
+	"github.com/OffchainLabs/prysm/v6/beacon-chain/core/helpers"
+	"github.com/OffchainLabs/prysm/v6/beacon-chain/state"
+	"github.com/OffchainLabs/prysm/v6/consensus-types/interfaces"
+	"github.com/OffchainLabs/prysm/v6/consensus-types/primitives"
+	enginev1 "github.com/OffchainLabs/prysm/v6/proto/engine/v1"
+	"github.com/OffchainLabs/prysm/v6/runtime/version"
+	"github.com/OffchainLabs/prysm/v6/time/slots"
+	"github.com/pkg/errors"
+)
+
+func processExecution(state state.BeaconState, body interfaces.ReadOnlyBeaconBlockBody) (err error) {
+	if body.Version() >= version.EPBS {
+		state, err = blocks.ProcessWithdrawals(state, nil)
+		if err != nil {
+			return errors.Wrap(err, "could not process withdrawals")
+		}
+		return processExecutionPayloadHeader(state, body)
+	}
+	enabled, err := blocks.IsExecutionEnabled(state, body)
+	if err != nil {
+		return errors.Wrap(err, "could not check if execution is enabled")
+	}
+	if !enabled {
+		return nil
+	}
+	executionData, err := body.Execution()
+	if err != nil {
+		return err
+	}
+	if state.Version() >= version.Capella {
+		state, err = blocks.ProcessWithdrawals(state, executionData)
+		if err != nil {
+			return errors.Wrap(err, "could not process withdrawals")
+		}
+	}
+	if err := blocks.ProcessPayload(state, body); err != nil {
+		return errors.Wrap(err, "could not process execution data")
+	}
+	return nil
+}
+
+// This function verifies the signature as it is not necessarily signed by the
+// proposer
+func processExecutionPayloadHeader(state state.BeaconState, body interfaces.ReadOnlyBeaconBlockBody) (err error) {
+	sh, err := body.SignedExecutionPayloadHeader()
+	if err != nil {
+		return err
+	}
+	header, err := sh.Header()
+	if err != nil {
+		return err
+	}
+	if err := epbs.ValidatePayloadHeaderSignature(state, sh); err != nil {
+		return err
+	}
+	builderIndex := header.BuilderIndex()
+	builder, err := state.ValidatorAtIndex(builderIndex)
+	if err != nil {
+		return err
+	}
+	epoch := slots.ToEpoch(state.Slot())
+	if builder.ActivationEpoch > epoch || epoch >= builder.ExitEpoch {
+		return errors.New("builder is not active")
+	}
+	if builder.Slashed {
+		return errors.New("builder is slashed")
+	}
+	amount := header.Value()
+	builderBalance, err := state.BalanceAtIndex(builderIndex)
+	if err != nil {
+		return err
+	}
+	if amount > primitives.Gwei(builderBalance) {
+		return errors.New("builder has insufficient balance")
+	}
+	// sate.Slot == block.Slot because of process_slot
+	if header.Slot() != state.Slot() {
+		return errors.New("incorrect header slot")
+	}
+	// the state latest block header has the parent root because of
+	// process_block_header
+	blockHeader := state.LatestBlockHeader()
+	if header.ParentBlockRoot() != [32]byte(blockHeader.ParentRoot) {
+		return errors.New("incorrect parent block root")
+	}
+	lbh, err := state.LatestBlockHash()
+	if err != nil {
+		return err
+	}
+	if header.ParentBlockHash() != [32]byte(lbh) {
+		return fmt.Errorf("incorrect parent block hash, got: %x, wanted: %x", header.ParentBlockHash(), lbh)
+	}
+	if err := state.UpdateBalancesAtIndex(builderIndex, builderBalance-uint64(amount)); err != nil {
+		return err
+	}
+	if err := helpers.IncreaseBalance(state, blockHeader.ProposerIndex, uint64(amount)); err != nil {
+		return err
+	}
+	headerEPBS, ok := header.Proto().(*enginev1.ExecutionPayloadHeaderEPBS)
+	if !ok {
+		return errors.New("not an ePBS execution payload header")
+	}
+	return state.SetLatestExecutionPayloadHeaderEPBS(headerEPBS)
+}

beacon-chain/core/transition/transition_no_verify_sig.go

@@ -7,12 +7,12 @@ import (
 
 	"github.com/OffchainLabs/prysm/v6/beacon-chain/core/altair"
 	b "github.com/OffchainLabs/prysm/v6/beacon-chain/core/blocks"
-	"github.com/OffchainLabs/prysm/v6/beacon-chain/core/electra"
-	"github.com/OffchainLabs/prysm/v6/beacon-chain/core/transition/interop"
+	"github.com/OffchainLabs/prysm/v6/beacon-chain/core/epbs"
 	v "github.com/OffchainLabs/prysm/v6/beacon-chain/core/validators"
 	"github.com/OffchainLabs/prysm/v6/beacon-chain/state"
 	"github.com/OffchainLabs/prysm/v6/consensus-types/blocks"
 	"github.com/OffchainLabs/prysm/v6/consensus-types/interfaces"
+	"github.com/OffchainLabs/prysm/v6/consensus-types/primitives"
 	"github.com/OffchainLabs/prysm/v6/crypto/bls"
 	"github.com/OffchainLabs/prysm/v6/monitoring/tracing"
 	"github.com/OffchainLabs/prysm/v6/monitoring/tracing/trace"
@@ -58,15 +58,29 @@ 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 st.Version() < version.EPBS {
+		st, err = ProcessSlotsUsingNextSlotCache(ctx, st, parentRoot[:], signed.Block().Slot())
+	} else {
+		var lastFullSlot primitives.Slot
+		lastFullSlot, err = st.LatestFullSlot()
+		if err != nil {
+			return nil, nil, errors.Wrap(err, "could not get state latest full slot")
+		}
+		if lastFullSlot == st.Slot() {
+			var hash []byte
+			hash, err = st.LatestBlockHash()
+			if err != nil {
+				return nil, nil, errors.Wrap(err, "could not get state latest block hash")
+			}
+			st, err = ProcessSlotsUsingNextSlotCache(ctx, st, hash, signed.Block().Slot())
+		} else {
+			st, err = ProcessSlotsUsingNextSlotCache(ctx, st, parentRoot[:], signed.Block().Slot())
+		}
+	}
 	if err != nil {
 		return nil, nil, errors.Wrap(err, "could not process slots")
 	}
-
 	// Execute per block transition.
 	set, st, err := ProcessBlockNoVerifyAnySig(ctx, st, signed)
 	if err != nil {
@@ -132,7 +146,26 @@ func CalculateStateRoot(
 
 	// Execute per slots transition.
 	var err error
-	parentRoot := signed.Block().ParentRoot()
+	var parentRoot [32]byte
+	if state.Version() >= version.EPBS {
+		signedHeader, err := signed.Block().Body().SignedExecutionPayloadHeader()
+		if err != nil {
+			return [32]byte{}, errors.Wrap(err, "could not retrieve signed execution payload header")
+		}
+		header, err := signedHeader.Header()
+		if err != nil {
+			return [32]byte{}, errors.Wrap(err, "could not retrieve execution payload header")
+		}
+		lbh, err := state.LatestBlockHash()
+		if err != nil {
+			return [32]byte{}, errors.Wrap(err, "could not get state latest block hash")
+		}
+		if header.ParentBlockHash() == [32]byte(lbh) {
+			parentRoot = [32]byte(lbh)
+		} else {
+			parentRoot = signed.Block().ParentRoot()
+		}
+	}
 	state, err = ProcessSlotsUsingNextSlotCache(ctx, state, parentRoot[:], signed.Block().Slot())
 	if err != nil {
 		return [32]byte{}, errors.Wrap(err, "could not process slots")
@@ -272,7 +305,7 @@ func ProcessOperationsNoVerifyAttsSigs(
 			return nil, err
 		}
 	} else {
-		state, err = electra.ProcessOperations(ctx, state, beaconBlock)
+		state, err = epbs.ProcessOperations(ctx, state, beaconBlock)
 		if err != nil {
 			return nil, err
 		}
@@ -318,26 +351,9 @@ func ProcessBlockForStateRoot(
 		return nil, errors.Wrap(err, "could not process block header")
 	}
 
-	enabled, err := b.IsExecutionEnabled(state, blk.Body())
-	if err != nil {
-		return nil, errors.Wrap(err, "could not check if execution is enabled")
+	if err := processExecution(state, blk.Body()); err != nil {
+		return nil, errors.Wrap(err, "could not process execution")
 	}
-	if enabled {
-		executionData, err := blk.Body().Execution()
-		if err != nil {
-			return nil, err
-		}
-		if state.Version() >= version.Capella {
-			state, err = b.ProcessWithdrawals(state, executionData)
-			if err != nil {
-				return nil, errors.Wrap(err, "could not process withdrawals")
-			}
-		}
-		if err = b.ProcessPayload(state, blk.Body()); err != nil {
-			return nil, errors.Wrap(err, "could not process execution data")
-		}
-	}
-
 	randaoReveal := signed.Block().Body().RandaoReveal()
 	state, err = b.ProcessRandaoNoVerify(state, randaoReveal[:])
 	if err != nil {

beacon-chain/db/iface/BUILD.bazel

@@ -18,6 +18,7 @@ go_library(
         "//consensus-types/primitives:go_default_library",
         "//monitoring/backup:go_default_library",
         "//proto/dbval:go_default_library",
+        "//proto/engine/v1:go_default_library",
         "//proto/prysm/v1alpha1:go_default_library",
         "@com_github_ethereum_go_ethereum//common:go_default_library",
     ],

beacon-chain/db/iface/interface.go

@@ -15,6 +15,7 @@ import (
 	"github.com/OffchainLabs/prysm/v6/consensus-types/primitives"
 	"github.com/OffchainLabs/prysm/v6/monitoring/backup"
 	"github.com/OffchainLabs/prysm/v6/proto/dbval"
+	engine "github.com/OffchainLabs/prysm/v6/proto/engine/v1"
 	ethpb "github.com/OffchainLabs/prysm/v6/proto/prysm/v1alpha1"
 	"github.com/ethereum/go-ethereum/common"
 )
@@ -23,11 +24,13 @@ import (
 type ReadOnlyDatabase interface {
 	// Block related methods.
 	Block(ctx context.Context, blockRoot [32]byte) (interfaces.ReadOnlySignedBeaconBlock, error)
+	SignedExecutionPayloadHeader(ctx context.Context, blockRoot [32]byte) (interfaces.ROSignedExecutionPayloadHeader, error)
 	Blocks(ctx context.Context, f *filters.QueryFilter) ([]interfaces.ReadOnlySignedBeaconBlock, [][32]byte, error)
 	BlockRoots(ctx context.Context, f *filters.QueryFilter) ([][32]byte, error)
 	BlocksBySlot(ctx context.Context, slot primitives.Slot) ([]interfaces.ReadOnlySignedBeaconBlock, error)
 	BlockRootsBySlot(ctx context.Context, slot primitives.Slot) (bool, [][32]byte, error)
 	HasBlock(ctx context.Context, blockRoot [32]byte) bool
+	HasBlindPayloadEnvelope(ctx context.Context, hash [32]byte) bool
 	GenesisBlock(ctx context.Context) (interfaces.ReadOnlySignedBeaconBlock, error)
 	GenesisBlockRoot(ctx context.Context) ([32]byte, error)
 	IsFinalizedBlock(ctx context.Context, blockRoot [32]byte) bool
@@ -53,6 +56,7 @@ type ReadOnlyDatabase interface {
 	DepositContractAddress(ctx context.Context) ([]byte, error)
 	// ExecutionChainData operations.
 	ExecutionChainData(ctx context.Context) (*ethpb.ETH1ChainData, error)
+	SignedBlindPayloadEnvelope(ctx context.Context, blockHash []byte) (*engine.SignedBlindPayloadEnvelope, error)
 	// Fee recipients operations.
 	FeeRecipientByValidatorID(ctx context.Context, id primitives.ValidatorIndex) (common.Address, error)
 	RegistrationByValidatorID(ctx context.Context, id primitives.ValidatorIndex) (*ethpb.ValidatorRegistrationV1, error)
@@ -91,6 +95,7 @@ type NoHeadAccessDatabase interface {
 	SaveDepositContractAddress(ctx context.Context, addr common.Address) error
 	// SaveExecutionChainData operations.
 	SaveExecutionChainData(ctx context.Context, data *ethpb.ETH1ChainData) error
+	SaveBlindPayloadEnvelope(ctx context.Context, envelope interfaces.ROSignedExecutionPayloadEnvelope) error
 	// Run any required database migrations.
 	RunMigrations(ctx context.Context) error
 	// Fee recipients operations.

beacon-chain/db/kv/BUILD.bazel

@@ -6,10 +6,12 @@ go_library(
         "archived_point.go",
         "backfill.go",
         "backup.go",
+        "blind_payload_envelope.go",
         "blocks.go",
         "checkpoint.go",
         "deposit_contract.go",
         "encoding.go",
+        "epbs.go",
         "error.go",
         "execution_chain.go",
         "finalized_block_roots.go",
@@ -55,6 +57,7 @@ go_library(
         "//monitoring/tracing:go_default_library",
         "//monitoring/tracing/trace:go_default_library",
         "//proto/dbval:go_default_library",
+        "//proto/engine/v1:go_default_library",
         "//proto/prysm/v1alpha1:go_default_library",
         "//runtime/version:go_default_library",
         "//time:go_default_library",
@@ -71,6 +74,7 @@ go_library(
         "@com_github_schollz_progressbar_v3//:go_default_library",
         "@com_github_sirupsen_logrus//:go_default_library",
         "@io_etcd_go_bbolt//:go_default_library",
+        "@io_opencensus_go//trace:go_default_library",
         "@org_golang_google_protobuf//proto:go_default_library",
     ],
 )
@@ -81,10 +85,12 @@ go_test(
         "archived_point_test.go",
         "backfill_test.go",
         "backup_test.go",
+        "blind_payload_envelope_test.go",
         "blocks_test.go",
         "checkpoint_test.go",
         "deposit_contract_test.go",
         "encoding_test.go",
+        "epbs_test.go",
         "execution_chain_test.go",
         "finalized_block_roots_test.go",
         "genesis_test.go",
@@ -124,6 +130,7 @@ go_test(
         "//testing/assert:go_default_library",
         "//testing/require:go_default_library",
         "//testing/util:go_default_library",
+        "//testing/util/random:go_default_library",
         "//time/slots:go_default_library",
         "@com_github_ethereum_go_ethereum//common:go_default_library",
         "@com_github_golang_snappy//:go_default_library",

beacon-chain/db/kv/blind_payload_envelope.go

@@ -0,0 +1,76 @@
+package kv
+
+import (
+	"context"
+
+	"github.com/OffchainLabs/prysm/v6/consensus-types/interfaces"
+	engine "github.com/OffchainLabs/prysm/v6/proto/engine/v1"
+	"github.com/pkg/errors"
+	bolt "go.etcd.io/bbolt"
+	"go.opencensus.io/trace"
+)
+
+// SaveBlindPayloadEnvelope saves a signed execution payload envelope blind in the database.
+func (s *Store) SaveBlindPayloadEnvelope(ctx context.Context, signed interfaces.ROSignedExecutionPayloadEnvelope) error {
+	ctx, span := trace.StartSpan(ctx, "BeaconDB.SaveBlindPayloadEnvelope")
+	defer span.End()
+
+	pb := signed.Proto()
+	if pb == nil {
+		return errors.New("nil payload envelope")
+	}
+	env, ok := pb.(*engine.SignedExecutionPayloadEnvelope)
+	if !ok {
+		return errors.New("invalid payload envelope")
+	}
+
+	r := env.Message.Payload.BlockHash
+	blind := env.Blind()
+	if blind == nil {
+		return errors.New("nil blind payload envelope")
+	}
+	enc, err := encode(ctx, blind)
+	if err != nil {
+		return err
+	}
+	err = s.db.Update(func(tx *bolt.Tx) error {
+		bucket := tx.Bucket(executionPayloadEnvelopeBucket)
+		return bucket.Put(r, enc)
+	})
+
+	return err
+}
+
+// SignedBlindPayloadEnvelope retrieves a signed execution payload envelope blind from the database.
+func (s *Store) SignedBlindPayloadEnvelope(ctx context.Context, blockHash []byte) (*engine.SignedBlindPayloadEnvelope, error) {
+	ctx, span := trace.StartSpan(ctx, "BeaconDB.SignedBlindPayloadEnvelope")
+	defer span.End()
+
+	env := &engine.SignedBlindPayloadEnvelope{}
+	err := s.db.View(func(tx *bolt.Tx) error {
+		bkt := tx.Bucket(executionPayloadEnvelopeBucket)
+		enc := bkt.Get(blockHash)
+		if enc == nil {
+			return ErrNotFound
+		}
+		return decode(ctx, enc, env)
+	})
+	return env, err
+}
+
+func (s *Store) HasBlindPayloadEnvelope(ctx context.Context, hash [32]byte) bool {
+	_, span := trace.StartSpan(ctx, "BeaconDB.HasBlock")
+	defer span.End()
+	if v, ok := s.blockCache.Get(string(hash[:])); v != nil && ok {
+		return true
+	}
+	exists := false
+	if err := s.db.View(func(tx *bolt.Tx) error {
+		bkt := tx.Bucket(executionPayloadEnvelopeBucket)
+		exists = bkt.Get(hash[:]) != nil
+		return nil
+	}); err != nil { // This view never returns an error, but we'll handle anyway for sanity.
+		panic(err) // lint:nopanic -- This should never happen.
+	}
+	return exists
+}

beacon-chain/db/kv/blind_payload_envelope_test.go

@@ -0,0 +1,26 @@
+package kv
+
+import (
+	"context"
+	"testing"
+
+	"github.com/OffchainLabs/prysm/v6/consensus-types/blocks"
+	"github.com/OffchainLabs/prysm/v6/testing/require"
+	"github.com/OffchainLabs/prysm/v6/testing/util/random"
+)
+
+func TestStore_SignedBlindPayloadEnvelope(t *testing.T) {
+	db := setupDB(t)
+	ctx := context.Background()
+	_, err := db.SignedBlindPayloadEnvelope(ctx, []byte("test"))
+	require.ErrorIs(t, err, ErrNotFound)
+
+	env := random.SignedExecutionPayloadEnvelope(t)
+	e, err := blocks.WrappedROSignedExecutionPayloadEnvelope(env)
+	require.NoError(t, err)
+	err = db.SaveBlindPayloadEnvelope(ctx, e)
+	require.NoError(t, err)
+	got, err := db.SignedBlindPayloadEnvelope(ctx, env.Message.Payload.BlockHash)
+	require.NoError(t, err)
+	require.DeepEqual(t, got, env.Blind())
+}

beacon-chain/db/kv/blocks.go

@@ -52,7 +52,7 @@ func (s *Store) getBlock(ctx context.Context, blockRoot [32]byte, tx *bolt.Tx) (
 		}
 		defer func() {
 			if err := tx.Rollback(); err != nil {
-				log.WithError(err).Error("could not rollback read-only getBlock transaction")
+				log.WithError(err).Error("Could not rollback read-only getBlock transaction")
 			}
 		}()
 	}
@@ -1170,6 +1170,11 @@ func unmarshalBlock(_ context.Context, enc []byte) (interfaces.ReadOnlySignedBea
 		if err := rawBlock.UnmarshalSSZ(enc[len(fuluBlindKey):]); err != nil {
 			return nil, errors.Wrap(err, "could not unmarshal blinded Fulu block")
 		}
+	case hasEpbsKey(enc):
+		rawBlock = &ethpb.SignedBeaconBlockEpbs{}
+		if err := rawBlock.UnmarshalSSZ(enc[len(epbsKey):]); err != nil {
+			return nil, errors.Wrap(err, "could not unmarshal EPBS block")
+		}
 	default:
 		// Marshal block bytes to phase 0 beacon block.
 		rawBlock = &ethpb.SignedBeaconBlock{}
@@ -1200,6 +1205,10 @@ func encodeBlock(blk interfaces.ReadOnlySignedBeaconBlock) ([]byte, error) {
 func keyForBlock(blk interfaces.ReadOnlySignedBeaconBlock) ([]byte, error) {
 	v := blk.Version()
 
+	if v >= version.EPBS {
+		return epbsKey, nil
+	}
+
 	if v >= version.Fulu {
 		if blk.IsBlinded() {
 			return fuluBlindKey, nil

beacon-chain/db/kv/blocks_test.go

@@ -150,6 +150,17 @@ var blockTests = []struct {
 			}
 			return blocks.NewSignedBeaconBlock(b)
 		}},
+	{
+		name: "epbs",
+		newBlock: func(slot primitives.Slot, root []byte) (interfaces.ReadOnlySignedBeaconBlock, error) {
+			b := random.SignedBeaconBlock(&testing.T{})
+			b.Block.Slot = slot
+			if root != nil {
+				b.Block.ParentRoot = root
+			}
+			return blocks.NewSignedBeaconBlock(b)
+		},
+	},
 }
 
 func TestStore_SaveBlock_NoDuplicates(t *testing.T) {
@@ -210,7 +221,7 @@ func TestStore_BlocksCRUD(t *testing.T) {
 			retrievedBlock, err = db.Block(ctx, blockRoot)
 			require.NoError(t, err)
 			wanted := retrievedBlock
-			if retrievedBlock.Version() >= version.Bellatrix {
+			if retrievedBlock.Version() >= version.Bellatrix && retrievedBlock.Version() < version.EPBS {
 				wanted, err = retrievedBlock.ToBlinded()
 				require.NoError(t, err)
 			}
@@ -642,7 +653,7 @@ func TestStore_BlocksCRUD_NoCache(t *testing.T) {
 			require.NoError(t, err)
 
 			wanted := blk
-			if blk.Version() >= version.Bellatrix {
+			if blk.Version() >= version.Bellatrix && blk.Version() < version.EPBS {
 				wanted, err = blk.ToBlinded()
 				require.NoError(t, err)
 			}
@@ -975,7 +986,7 @@ func TestStore_SaveBlock_CanGetHighestAt(t *testing.T) {
 			b, err := db.Block(ctx, root)
 			require.NoError(t, err)
 			wanted := block1
-			if block1.Version() >= version.Bellatrix {
+			if block1.Version() >= version.Bellatrix && block1.Version() < version.EPBS {
 				wanted, err = wanted.ToBlinded()
 				require.NoError(t, err)
 			}
@@ -993,7 +1004,7 @@ func TestStore_SaveBlock_CanGetHighestAt(t *testing.T) {
 			b, err = db.Block(ctx, root)
 			require.NoError(t, err)
 			wanted2 := block2
-			if block2.Version() >= version.Bellatrix {
+			if block2.Version() >= version.Bellatrix && block2.Version() < version.EPBS {
 				wanted2, err = block2.ToBlinded()
 				require.NoError(t, err)
 			}
@@ -1011,7 +1022,7 @@ func TestStore_SaveBlock_CanGetHighestAt(t *testing.T) {
 			b, err = db.Block(ctx, root)
 			require.NoError(t, err)
 			wanted = block3
-			if block3.Version() >= version.Bellatrix {
+			if block3.Version() >= version.Bellatrix && block3.Version() < version.EPBS {
 				wanted, err = wanted.ToBlinded()
 				require.NoError(t, err)
 			}
@@ -1047,7 +1058,7 @@ func TestStore_GenesisBlock_CanGetHighestAt(t *testing.T) {
 			b, err := db.Block(ctx, root)
 			require.NoError(t, err)
 			wanted := block1
-			if block1.Version() >= version.Bellatrix {
+			if block1.Version() >= version.Bellatrix && block1.Version() < version.EPBS {
 				wanted, err = block1.ToBlinded()
 				require.NoError(t, err)
 			}
@@ -1064,7 +1075,7 @@ func TestStore_GenesisBlock_CanGetHighestAt(t *testing.T) {
 			b, err = db.Block(ctx, root)
 			require.NoError(t, err)
 			wanted = genesisBlock
-			if genesisBlock.Version() >= version.Bellatrix {
+			if genesisBlock.Version() >= version.Bellatrix && genesisBlock.Version() < version.EPBS {
 				wanted, err = genesisBlock.ToBlinded()
 				require.NoError(t, err)
 			}
@@ -1081,7 +1092,7 @@ func TestStore_GenesisBlock_CanGetHighestAt(t *testing.T) {
 			b, err = db.Block(ctx, root)
 			require.NoError(t, err)
 			wanted = genesisBlock
-			if genesisBlock.Version() >= version.Bellatrix {
+			if genesisBlock.Version() >= version.Bellatrix && genesisBlock.Version() < version.EPBS {
 				wanted, err = genesisBlock.ToBlinded()
 				require.NoError(t, err)
 			}
@@ -1177,7 +1188,7 @@ func TestStore_BlocksBySlot_BlockRootsBySlot(t *testing.T) {
 			require.NoError(t, err)
 
 			wanted := b1
-			if b1.Version() >= version.Bellatrix {
+			if b1.Version() >= version.Bellatrix && b1.Version() < version.EPBS {
 				wanted, err = b1.ToBlinded()
 				require.NoError(t, err)
 			}
@@ -1193,7 +1204,7 @@ func TestStore_BlocksBySlot_BlockRootsBySlot(t *testing.T) {
 				t.Fatalf("Expected 2 blocks, received %d blocks", len(retrievedBlocks))
 			}
 			wanted = b2
-			if b2.Version() >= version.Bellatrix {
+			if b2.Version() >= version.Bellatrix && b2.Version() < version.EPBS {
 				wanted, err = b2.ToBlinded()
 				require.NoError(t, err)
 			}
@@ -1203,7 +1214,7 @@ func TestStore_BlocksBySlot_BlockRootsBySlot(t *testing.T) {
 			require.NoError(t, err)
 			assert.Equal(t, true, proto.Equal(wantedPb, retrieved0Pb), "Wanted: %v, received: %v", retrievedBlocks[0], wanted)
 			wanted = b3
-			if b3.Version() >= version.Bellatrix {
+			if b3.Version() >= version.Bellatrix && b3.Version() < version.EPBS {
 				wanted, err = b3.ToBlinded()
 				require.NoError(t, err)
 			}

beacon-chain/db/kv/encoding.go

@@ -6,6 +6,7 @@ import (
 	"reflect"
 
 	"github.com/OffchainLabs/prysm/v6/monitoring/tracing/trace"
+	engine "github.com/OffchainLabs/prysm/v6/proto/engine/v1"
 	ethpb "github.com/OffchainLabs/prysm/v6/proto/prysm/v1alpha1"
 	"github.com/golang/snappy"
 	fastssz "github.com/prysmaticlabs/fastssz"
@@ -78,6 +79,8 @@ func isSSZStorageFormat(obj interface{}) bool {
 		return true
 	case *ethpb.VoluntaryExit:
 		return true
+	case *engine.SignedBlindPayloadEnvelope:
+		return true
 	case *ethpb.ValidatorRegistrationV1:
 		return true
 	default:

beacon-chain/db/kv/epbs.go

@@ -0,0 +1,18 @@
+package kv
+
+import (
+	"context"
+
+	"github.com/OffchainLabs/prysm/v6/consensus-types/interfaces"
+)
+
+func (s *Store) SignedExecutionPayloadHeader(ctx context.Context, blockRoot [32]byte) (interfaces.ROSignedExecutionPayloadHeader, error) {
+	b, err := s.Block(ctx, blockRoot)
+	if err != nil {
+		return nil, err
+	}
+	if b.IsNil() {
+		return nil, ErrNotFound
+	}
+	return b.Block().Body().SignedExecutionPayloadHeader()
+}

beacon-chain/db/kv/epbs_test.go

@@ -0,0 +1,28 @@
+package kv
+
+import (
+	"context"
+	"testing"
+
+	"github.com/OffchainLabs/prysm/v6/consensus-types/blocks"
+	"github.com/OffchainLabs/prysm/v6/testing/require"
+	"github.com/OffchainLabs/prysm/v6/testing/util/random"
+)
+
+func Test_SignedExecutionPayloadHeader(t *testing.T) {
+	db := setupDB(t)
+	ctx := context.Background()
+
+	b := random.SignedBeaconBlock(t)
+	blk, err := blocks.NewSignedBeaconBlock(b)
+	require.NoError(t, err)
+	blockRoot, err := blk.Block().HashTreeRoot()
+	require.NoError(t, err)
+
+	require.NoError(t, db.SaveBlock(ctx, blk))
+	retrievedHeader, err := db.SignedExecutionPayloadHeader(ctx, blockRoot)
+	require.NoError(t, err)
+	wantedHeader, err := blk.Block().Body().SignedExecutionPayloadHeader()
+	require.NoError(t, err)
+	require.DeepEqual(t, wantedHeader, retrievedHeader)
+}

beacon-chain/db/kv/key.go

@@ -80,3 +80,10 @@ func hasFuluBlindKey(enc []byte) bool {
 	}
 	return bytes.Equal(enc[:len(fuluBlindKey)], fuluBlindKey)
 }
+
+func hasEpbsKey(enc []byte) bool {
+	if len(epbsKey) >= len(enc) {
+		return false
+	}
+	return bytes.Equal(enc[:len(epbsKey)], epbsKey)
+}

beacon-chain/db/kv/kv.go

@@ -123,6 +123,9 @@ var Buckets = [][]byte{
 
 	feeRecipientBucket,
 	registrationBucket,
+
+	// ePBS
+	executionPayloadEnvelopeBucket,
 }
 
 // KVStoreOption is a functional option that modifies a kv.Store.

beacon-chain/db/kv/schema.go

@@ -7,15 +7,16 @@ package kv
 // it easy to scan for keys that have a certain shard number as a prefix and return those
 // corresponding attestations.
 var (
-	blocksBucket          = []byte("blocks")
-	stateBucket           = []byte("state")
-	stateSummaryBucket    = []byte("state-summary")
-	chainMetadataBucket   = []byte("chain-metadata")
-	checkpointBucket      = []byte("check-point")
-	powchainBucket        = []byte("powchain")
-	stateValidatorsBucket = []byte("state-validators")
-	feeRecipientBucket    = []byte("fee-recipient")
-	registrationBucket    = []byte("registration")
+	blocksBucket                   = []byte("blocks")
+	stateBucket                    = []byte("state")
+	stateSummaryBucket             = []byte("state-summary")
+	chainMetadataBucket            = []byte("chain-metadata")
+	checkpointBucket               = []byte("check-point")
+	powchainBucket                 = []byte("powchain")
+	stateValidatorsBucket          = []byte("state-validators")
+	feeRecipientBucket             = []byte("fee-recipient")
+	registrationBucket             = []byte("registration")
+	executionPayloadEnvelopeBucket = []byte("execution-payload-envelope")
 
 	// Light Client Updates Bucket
 	lightClientUpdatesBucket       = []byte("light-client-updates")
@@ -57,6 +58,7 @@ var (
 	electraBlindKey            = []byte("blind-electra")
 	fuluKey                    = []byte("fulu")
 	fuluBlindKey               = []byte("blind-fulu")
+	epbsKey                    = []byte("epbs")
 
 	// block root included in the beacon state used by weak subjectivity initial sync
 	originCheckpointBlockRootKey = []byte("origin-checkpoint-block-root")

beacon-chain/db/kv/state.go

@@ -253,6 +253,10 @@ func (s *Store) saveStatesEfficientInternal(ctx context.Context, tx *bolt.Tx, bl
 			if err := s.processElectra(ctx, rawType, rt[:], bucket, valIdxBkt, validatorKeys[i]); err != nil {
 				return err
 			}
+		case *ethpb.BeaconStateEPBS:
+			if err := s.processEPBS(ctx, rawType, rt[:], bucket, valIdxBkt, validatorKeys[i]); err != nil {
+				return err
+			}
 		default:
 			return errors.New("invalid state type")
 		}
@@ -368,6 +372,24 @@ func (s *Store) processElectra(ctx context.Context, pbState *ethpb.BeaconStateEl
 	return nil
 }
 
+func (s *Store) processEPBS(ctx context.Context, pbState *ethpb.BeaconStateEPBS, rootHash []byte, bucket, valIdxBkt *bolt.Bucket, validatorKey []byte) error {
+	valEntries := pbState.Validators
+	pbState.Validators = make([]*ethpb.Validator, 0)
+	rawObj, err := pbState.MarshalSSZ()
+	if err != nil {
+		return err
+	}
+	encodedState := snappy.Encode(nil, append(epbsKey, rawObj...))
+	if err := bucket.Put(rootHash, encodedState); err != nil {
+		return err
+	}
+	pbState.Validators = valEntries
+	if err := valIdxBkt.Put(rootHash, validatorKey); err != nil {
+		return err
+	}
+	return nil
+}
+
 func (s *Store) storeValidatorEntriesSeparately(ctx context.Context, tx *bolt.Tx, validatorsEntries map[string]*ethpb.Validator) error {
 	valBkt := tx.Bucket(stateValidatorsBucket)
 	for hashStr, validatorEntry := range validatorsEntries {
@@ -522,14 +544,13 @@ func (s *Store) unmarshalState(_ context.Context, enc []byte, validatorEntries [
 		if err := protoState.UnmarshalSSZ(enc[len(fuluKey):]); err != nil {
 			return nil, errors.Wrap(err, "failed to unmarshal encoding for Fulu")
 		}
-		ok, err := s.isStateValidatorMigrationOver()
-		if err != nil {
-			return nil, err
+		return statenative.InitializeFromProtoFulu(protoState)
+	case hasEpbsKey(enc):
+		protoState := &ethpb.BeaconStateEPBS{}
+		if err := protoState.UnmarshalSSZ(enc[len(epbsKey):]); err != nil {
+			return nil, errors.Wrap(err, "failed to unmarshal encoding for EPBS")
 		}
-		if ok {
-			protoState.Validators = validatorEntries
-		}
-		return statenative.InitializeFromProtoUnsafeFulu(protoState)
+		return statenative.InitializeFromProtoEpbs(protoState)
 	case HasElectraKey(enc):
 		protoState := &ethpb.BeaconStateElectra{}
 		if err := protoState.UnmarshalSSZ(enc[len(ElectraKey):]); err != nil {
@@ -701,7 +722,20 @@ func marshalState(ctx context.Context, st state.ReadOnlyBeaconState) ([]byte, er
 		if err != nil {
 			return nil, err
 		}
-		return snappy.Encode(nil, append(fuluKey, rawObj...)), nil
+		return snappy.Encode(nil, append(ElectraKey, rawObj...)), nil
+	case version.EPBS:
+		rState, ok := st.ToProtoUnsafe().(*ethpb.BeaconStateEPBS)
+		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(epbsKey, rawObj...)), nil
 	default:
 		return nil, errors.New("invalid inner state")
 	}

beacon-chain/db/kv/state_test.go

@@ -156,6 +156,16 @@ func TestState_CanSaveRetrieve(t *testing.T) {
 			},
 			rootSeed: 'E',
 		},
+		{
+			name: "epbs",
+			s: func() state.BeaconState {
+				stPb := random.BeaconState(t)
+				st, err := statenative.InitializeFromProtoUnsafeEpbs(stPb)
+				require.NoError(t, err)
+				return st
+			},
+			rootSeed: 'F',
+		},
 	}
 
 	db := setupDB(t)
@@ -164,6 +174,9 @@ func TestState_CanSaveRetrieve(t *testing.T) {
 		reset := features.InitWithReset(&features.Flags{EnableHistoricalSpaceRepresentation: enableFlag})
 
 		for _, tc := range cases {
+			if tc.name == "epbs" && enableFlag {
+				t.Skip("Skipping epbs test as EnableHistoricalSpaceRepresentation is true")
+			}
 			t.Run(tc.name+" - EnableHistoricalSpaceRepresentation is "+strconv.FormatBool(enableFlag), func(t *testing.T) {
 				rootNonce := byte('0')
 				if enableFlag {
@@ -1131,6 +1144,26 @@ func TestDenebState_CanDelete(t *testing.T) {
 	require.Equal(t, state.ReadOnlyBeaconState(nil), savedS, "Unsaved state should've been nil")
 }
 
+func TestEpbsState_CanDelete(t *testing.T) {
+	db := setupDB(t)
+
+	r := [32]byte{'A'}
+
+	require.Equal(t, false, db.HasState(context.Background(), r))
+
+	s := random.BeaconState(t)
+	st, err := statenative.InitializeFromProtoUnsafeEpbs(s)
+	require.NoError(t, err)
+
+	require.NoError(t, db.SaveState(context.Background(), st, r))
+	require.Equal(t, true, db.HasState(context.Background(), r))
+
+	require.NoError(t, db.DeleteState(context.Background(), r))
+	savedS, err := db.State(context.Background(), r)
+	require.NoError(t, err)
+	require.Equal(t, state.ReadOnlyBeaconState(nil), savedS, "Unsaved state should've been nil")
+}
+
 func TestStateDeneb_CanSaveRetrieveValidatorEntries(t *testing.T) {
 	db := setupDB(t)
 

beacon-chain/execution/BUILD.bazel

@@ -7,6 +7,7 @@ go_library(
         "block_reader.go",
         "deposit.go",
         "engine_client.go",
+        "engine_client_epbs.go",
         "errors.go",
         "log.go",
         "log_processing.go",

beacon-chain/execution/engine_client.go

@@ -124,6 +124,8 @@ type Reconstructor interface {
 	) ([]interfaces.SignedBeaconBlock, error)
 	ReconstructBlobSidecars(ctx context.Context, block interfaces.ReadOnlySignedBeaconBlock, blockRoot [fieldparams.RootLength]byte, hi func(uint64) bool) ([]blocks.VerifiedROBlob, error)
 	ReconstructDataColumnSidecars(ctx context.Context, block interfaces.ReadOnlySignedBeaconBlock, blockRoot [fieldparams.RootLength]byte) ([]blocks.VerifiedRODataColumn, error)
+	Client() RPCClient
+	ReconstructPayloadEnvelope(ctx context.Context, e *pb.SignedBlindPayloadEnvelope) (*pb.SignedExecutionPayloadEnvelope, error)
 }
 
 // EngineCaller defines a client that can interact with an Ethereum
@@ -239,7 +241,7 @@ func (s *Service) ForkchoiceUpdated(
 		if err != nil {
 			return nil, nil, handleRPCError(err)
 		}
-	case version.Deneb, version.Electra, version.Fulu:
+	case version.Deneb, version.Electra, version.Fulu, version.EPBS:
 		a, err := attrs.PbV3()
 		if err != nil {
 			return nil, nil, err

beacon-chain/execution/engine_client_epbs.go

@@ -0,0 +1,70 @@
+package execution
+
+import (
+	"context"
+
+	pb "github.com/OffchainLabs/prysm/v6/proto/engine/v1"
+	"github.com/ethereum/go-ethereum/common"
+)
+
+func (s *Service) ReconstructPayloadEnvelope(ctx context.Context, e *pb.SignedBlindPayloadEnvelope) (*pb.SignedExecutionPayloadEnvelope, error) {
+	result := make([]*pb.ExecutionPayloadBody, 0)
+	if err := s.rpcClient.CallContext(ctx, &result, GetPayloadBodiesByHashV1, []common.Hash{common.Hash(e.Message.BlockHash)}); err != nil {
+		return nil, err
+	}
+	if result == nil || len(result) == 0 {
+		return nil, nil
+	}
+	b := result[0]
+
+	txs := make([][]byte, len(b.Transactions))
+	for i, t := range b.Transactions {
+		txs[i] = t
+	}
+	dr, err := pb.JsonDepositRequestsToProto(b.DepositRequests)
+	if err != nil {
+		return nil, err
+	}
+	wr, err := pb.JsonWithdrawalRequestsToProto(b.WithdrawalRequests)
+	if err != nil {
+		return nil, err
+	}
+	cr, err := pb.JsonConsolidationRequestsToProto(b.ConsolidationRequests)
+	if err != nil {
+		return nil, err
+	}
+	return &pb.SignedExecutionPayloadEnvelope{
+		Message: &pb.ExecutionPayloadEnvelope{
+			Payload: &pb.ExecutionPayloadDeneb{
+				ParentHash:    e.Message.ParentHash,
+				FeeRecipient:  e.Message.FeeRecipient,
+				StateRoot:     e.Message.StateRoot,
+				ReceiptsRoot:  e.Message.ReceiptsRoot,
+				LogsBloom:     e.Message.LogsBloom,
+				PrevRandao:    e.Message.PrevRandao,
+				BlockNumber:   e.Message.BlockNumber,
+				GasLimit:      e.Message.GasLimit,
+				GasUsed:       e.Message.GasUsed,
+				Timestamp:     e.Message.Timestamp,
+				ExtraData:     e.Message.ExtraData,
+				BaseFeePerGas: e.Message.BaseFeePerGas,
+				BlockHash:     e.Message.BlockHash,
+				Transactions:  txs,
+				Withdrawals:   b.Withdrawals,
+				BlobGasUsed:   e.Message.BlobGasUsed,
+				ExcessBlobGas: e.Message.ExcessBlobGas,
+			},
+			ExecutionRequests: &pb.ExecutionRequests{
+				Deposits:       dr,
+				Withdrawals:    wr,
+				Consolidations: cr,
+			},
+			BuilderIndex:       e.Message.BuilderIndex,
+			BeaconBlockRoot:    e.Message.BeaconBlockRoot,
+			Slot:               e.Message.Slot,
+			BlobKzgCommitments: e.Message.BlobKzgCommitments,
+			BeaconStateRoot:    e.Message.BeaconStateRoot,
+		},
+		Signature: e.Signature,
+	}, nil
+}

beacon-chain/execution/service.go

@@ -950,3 +950,7 @@ func (c *capabilityCache) has(capability string) bool {
 	_, ok := c.capabilities[capability]
 	return ok
 }
+
+func (s *Service) Client() RPCClient {
+	return s.rpcClient
+}

beacon-chain/forkchoice/BUILD.bazel

@@ -20,6 +20,7 @@ go_library(
         "//config/fieldparams:go_default_library",
         "//consensus-types/blocks:go_default_library",
         "//consensus-types/forkchoice:go_default_library",
+        "//consensus-types/interfaces:go_default_library",
         "//consensus-types/primitives:go_default_library",
         "@com_github_pkg_errors//:go_default_library",
     ],