gloas state upgrade

**What does this PR do? Why is it needed?**
This PR adds the implementation for `GetVersionV2` based on
[ethereum/beacon-APIs#568](https://github.com/ethereum/beacon-APIs/pull/568).

Q: is there anything to be done for deprecating `GetVersionV1`?

api/server/structs/endpoints_node.go

@@ -63,6 +63,19 @@ type PeerCount struct {
 	Connected     string `json:"connected"`
 	Disconnecting string `json:"disconnecting"`
 }
+type GetVersionV2Response struct {
+	Data *VersionV2 `json:"data"`
+}
+type VersionV2 struct {
+	BeaconNode      *ClientVersionV1 `json:"beacon_node"`
+	ExecutionClient *ClientVersionV1 `json:"execution_client,omitempty"`
+}
+type ClientVersionV1 struct {
+	Code    string `json:"code"`
+	Name    string `json:"name"`
+	Version string `json:"version"`
+	Commit  string `json:"commit"`
+}
 
 type GetVersionResponse struct {
 	Data *Version `json:"data"`

beacon-chain/core/gloas/BUILD.bazel

@@ -11,6 +11,7 @@ go_library(
         "payload_attestation.go",
         "pending_payment.go",
         "proposer_slashing.go",
+        "upgrade.go",
     ],
     importpath = "github.com/OffchainLabs/prysm/v7/beacon-chain/core/gloas",
     visibility = ["//visibility:public"],
@@ -20,6 +21,7 @@ go_library(
         "//beacon-chain/core/signing:go_default_library",
         "//beacon-chain/core/time: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:go_default_library",
@@ -49,11 +51,13 @@ go_test(
         "payload_test.go",
         "pending_payment_test.go",
         "proposer_slashing_test.go",
+        "upgrade_test.go",
     ],
     embed = [":go_default_library"],
     deps = [
         "//beacon-chain/core/helpers:go_default_library",
         "//beacon-chain/core/signing:go_default_library",
+        "//beacon-chain/core/time:go_default_library",
         "//beacon-chain/state:go_default_library",
         "//beacon-chain/state/state-native:go_default_library",
         "//beacon-chain/state/testing:go_default_library",

beacon-chain/core/gloas/payload.go

@@ -112,6 +112,34 @@ func ProcessExecutionPayload(
 		return errors.Wrap(err, "signature verification failed")
 	}
 
+	envelope, err := signedEnvelope.Envelope()
+	if err != nil {
+		return errors.Wrap(err, "could not get envelope from signed envelope")
+	}
+
+	if err := ApplyExecutionPayload(ctx, st, envelope); err != nil {
+		return err
+	}
+
+	r, err := st.HashTreeRoot(ctx)
+	if err != nil {
+		return errors.Wrap(err, "could not get hash tree root")
+	}
+	if r != envelope.StateRoot() {
+		return fmt.Errorf("state root mismatch: expected %#x, got %#x", envelope.StateRoot(), r)
+	}
+
+	return nil
+}
+
+// ApplyExecutionPayload applies the execution payload envelope to the state and performs the same
+// consistency checks as the full processing path. This keeps the post-payload state root computation
+// on a shared code path, even though some bid/payload checks are not strictly required for the root itself.
+func ApplyExecutionPayload(
+	ctx context.Context,
+	st state.BeaconState,
+	envelope interfaces.ROExecutionPayloadEnvelope,
+) error {
 	latestHeader := st.LatestBlockHeader()
 	if len(latestHeader.StateRoot) == 0 || bytes.Equal(latestHeader.StateRoot, make([]byte, 32)) {
 		previousStateRoot, err := st.HashTreeRoot(ctx)
@@ -128,10 +156,6 @@ func ProcessExecutionPayload(
 	if err != nil {
 		return errors.Wrap(err, "could not compute block header root")
 	}
-	envelope, err := signedEnvelope.Envelope()
-	if err != nil {
-		return errors.Wrap(err, "could not get envelope from signed envelope")
-	}
 
 	beaconBlockRoot := envelope.BeaconBlockRoot()
 	if !bytes.Equal(beaconBlockRoot[:], blockHeaderRoot[:]) {
@@ -217,14 +241,6 @@ func ProcessExecutionPayload(
 		return errors.Wrap(err, "could not set latest block hash")
 	}
 
-	r, err := st.HashTreeRoot(ctx)
-	if err != nil {
-		return errors.Wrap(err, "could not get hash tree root")
-	}
-	if r != envelope.StateRoot() {
-		return fmt.Errorf("state root mismatch: expected %#x, got %#x", envelope.StateRoot(), r)
-	}
-
 	return nil
 }
 

beacon-chain/core/gloas/upgrade.go

@@ -0,0 +1,170 @@
+package gloas
+
+import (
+	"github.com/OffchainLabs/prysm/v7/beacon-chain/core/time"
+	"github.com/OffchainLabs/prysm/v7/beacon-chain/state"
+	state_native "github.com/OffchainLabs/prysm/v7/beacon-chain/state/state-native"
+	"github.com/OffchainLabs/prysm/v7/config/params"
+	"github.com/OffchainLabs/prysm/v7/consensus-types/primitives"
+	enginev1 "github.com/OffchainLabs/prysm/v7/proto/engine/v1"
+	ethpb "github.com/OffchainLabs/prysm/v7/proto/prysm/v1alpha1"
+	"github.com/pkg/errors"
+)
+
+// UpgradeToGloas returns the Gloas state based on the generic input state.
+// https://github.com/ethereum/consensus-specs/blob/master/specs/gloas/fork.md#upgrading-the-state
+func UpgradeToGloas(beaconState state.BeaconState) (state.BeaconState, error) {
+	s, err := ConvertToGloas(beaconState)
+	if err != nil {
+		return nil, errors.Wrap(err, "could not convert to gloas")
+	}
+	return s, nil
+}
+
+func ConvertToGloas(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
+	}
+	depositRequestsStartIndex, err := beaconState.DepositRequestsStartIndex()
+	if err != nil {
+		return nil, err
+	}
+	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
+	}
+	pl, err := beaconState.ProposerLookahead()
+	if err != nil {
+		return nil, err
+	}
+	var proposerLookahead []uint64
+	for _, v := range pl {
+		proposerLookahead = append(proposerLookahead, uint64(v))
+	}
+	cfg := params.BeaconConfig()
+	executionPayloadAvailability := make([]byte, cfg.SlotsPerHistoricalRoot/8)
+	for i := range executionPayloadAvailability {
+		executionPayloadAvailability[i] = 0xFF
+	}
+	s := &ethpb.BeaconStateGloas{
+		GenesisTime:           uint64(beaconState.GenesisTime().Unix()),
+		GenesisValidatorsRoot: beaconState.GenesisValidatorsRoot(),
+		Slot:                  beaconState.Slot(),
+		Fork: &ethpb.Fork{
+			PreviousVersion: beaconState.Fork().CurrentVersion,
+			CurrentVersion:  params.BeaconConfig().GloasForkVersion,
+			Epoch:           time.CurrentEpoch(beaconState),
+		},
+		LatestBlockHeader:           beaconState.LatestBlockHeader(),
+		BlockRoots:                  beaconState.BlockRoots(),
+		StateRoots:                  beaconState.StateRoots(),
+		HistoricalRoots:             beaconState.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,
+
+		LatestExecutionPayloadBid: &ethpb.ExecutionPayloadBid{
+			ParentBlockHash: make([]byte, 32),
+			ParentBlockRoot: make([]byte, 32),
+			BlockHash:       payloadHeader.BlockHash(),
+			PrevRandao:      make([]byte, 32),
+			FeeRecipient:    make([]byte, 20),
+		},
+		NextWithdrawalIndex:           wi,
+		NextWithdrawalValidatorIndex:  vi,
+		HistoricalSummaries:           summaries,
+		DepositRequestsStartIndex:     depositRequestsStartIndex,
+		DepositBalanceToConsume:       depositBalanceToConsume,
+		ExitBalanceToConsume:          exitBalanceToConsume,
+		EarliestExitEpoch:             earliestExitEpoch,
+		ConsolidationBalanceToConsume: consolidationBalanceToConsume,
+		EarliestConsolidationEpoch:    earliestConsolidationEpoch,
+		PendingDeposits:               pendingDeposits,
+		PendingPartialWithdrawals:     pendingPartialWithdrawals,
+		PendingConsolidations:         pendingConsolidations,
+		ProposerLookahead:             proposerLookahead,
+
+		Builders:                     make([]*ethpb.Builder, 0),
+		NextWithdrawalBuilderIndex:   primitives.BuilderIndex(0),
+		ExecutionPayloadAvailability: executionPayloadAvailability,
+		BuilderPendingPayments:       make([]*ethpb.BuilderPendingPayment, cfg.SlotsPerEpoch*2),
+		BuilderPendingWithdrawals:    make([]*ethpb.BuilderPendingWithdrawal, 0),
+		LatestBlockHash:              payloadHeader.BlockHash(),
+		PayloadExpectedWithdrawals:   make([]*enginev1.Withdrawal, 0),
+	}
+	return state_native.InitializeFromProtoUnsafeGloas(s)
+}

beacon-chain/core/gloas/upgrade_test.go

@@ -0,0 +1,190 @@
+package gloas_test
+
+import (
+	"bytes"
+	"testing"
+
+	"github.com/OffchainLabs/prysm/v7/beacon-chain/core/gloas"
+	"github.com/OffchainLabs/prysm/v7/beacon-chain/core/time"
+	"github.com/OffchainLabs/prysm/v7/config/params"
+	"github.com/OffchainLabs/prysm/v7/consensus-types/blocks"
+	"github.com/OffchainLabs/prysm/v7/consensus-types/primitives"
+	enginev1 "github.com/OffchainLabs/prysm/v7/proto/engine/v1"
+	ethpb "github.com/OffchainLabs/prysm/v7/proto/prysm/v1alpha1"
+	"github.com/OffchainLabs/prysm/v7/testing/require"
+	"github.com/OffchainLabs/prysm/v7/testing/util"
+)
+
+func TestUpgradeToGloas(t *testing.T) {
+	st, _ := util.DeterministicGenesisStateFulu(t, params.BeaconConfig().MaxValidatorsPerCommittee)
+	require.NoError(t, st.SetHistoricalRoots([][]byte{{1}}))
+	vals := st.Validators()
+	vals[0].ActivationEpoch = params.BeaconConfig().FarFutureEpoch
+	vals[1].WithdrawalCredentials = []byte{params.BeaconConfig().CompoundingWithdrawalPrefixByte}
+	require.NoError(t, st.SetValidators(vals))
+	bals := st.Balances()
+	bals[1] = params.BeaconConfig().MinActivationBalance + 1000
+	require.NoError(t, st.SetBalances(bals))
+	executionPayloadHeader, err := st.LatestExecutionPayloadHeader()
+	require.NoError(t, err)
+	protoHeader, ok := executionPayloadHeader.Proto().(*enginev1.ExecutionPayloadHeaderDeneb)
+	require.Equal(t, true, ok)
+	protoHeader.BlockHash = bytes.Repeat([]byte{7}, 32)
+	newHeader, err := blocks.WrappedExecutionPayloadHeaderDeneb(protoHeader)
+	require.NoError(t, err)
+	require.NoError(t, st.SetLatestExecutionPayloadHeader(newHeader))
+
+	preForkState := st.Copy()
+	mSt, err := gloas.UpgradeToGloas(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())
+
+	f := mSt.Fork()
+	require.DeepSSZEqual(t, &ethpb.Fork{
+		PreviousVersion: st.Fork().CurrentVersion,
+		CurrentVersion:  params.BeaconConfig().GloasForkVersion,
+		Epoch:           time.CurrentEpoch(st),
+	}, f)
+
+	require.DeepSSZEqual(t, preForkState.LatestBlockHeader(), mSt.LatestBlockHeader())
+	require.DeepSSZEqual(t, preForkState.BlockRoots(), mSt.BlockRoots())
+	require.DeepSSZEqual(t, preForkState.StateRoots(), mSt.StateRoots())
+
+	hr1 := preForkState.HistoricalRoots()
+	hr2 := mSt.HistoricalRoots()
+	require.DeepEqual(t, hr1, hr2)
+
+	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.Validators(), mSt.Validators())
+	require.DeepSSZEqual(t, preForkState.Balances(), mSt.Balances())
+	require.DeepSSZEqual(t, preForkState.RandaoMixes(), mSt.RandaoMixes())
+	require.DeepSSZEqual(t, preForkState.Slashings(), mSt.Slashings())
+
+	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)
+
+	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())
+
+	s, err := mSt.InactivityScores()
+	require.NoError(t, err)
+	require.DeepSSZEqual(t, make([]uint64, numValidators), s)
+
+	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)
+
+	ph, err := st.LatestExecutionPayloadHeader()
+	require.NoError(t, err)
+	blockHash := ph.BlockHash()
+	executionPayloadBid, err := mSt.LatestExecutionPayloadBid()
+	require.NoError(t, err)
+	newBlockHash := executionPayloadBid.BlockHash()
+
+	require.DeepSSZEqual(t, blockHash, newBlockHash[:])
+
+	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))
+
+	preDepositRequestsStartIndex, err := preForkState.DepositRequestsStartIndex()
+	require.NoError(t, err)
+	postDepositRequestsStartIndex, err := mSt.DepositRequestsStartIndex()
+	require.NoError(t, err)
+	require.Equal(t, preDepositRequestsStartIndex, postDepositRequestsStartIndex)
+
+	preDepositBalanceToConsume, err := preForkState.DepositBalanceToConsume()
+	require.NoError(t, err)
+	postDepositBalanceToConsume, err := mSt.DepositBalanceToConsume()
+	require.NoError(t, err)
+	require.Equal(t, preDepositBalanceToConsume, postDepositBalanceToConsume)
+
+	preExitBalanceToConsume, err := preForkState.ExitBalanceToConsume()
+	require.NoError(t, err)
+	postExitBalanceToConsume, err := mSt.ExitBalanceToConsume()
+	require.NoError(t, err)
+	require.Equal(t, preExitBalanceToConsume, postExitBalanceToConsume)
+
+	preEarliestExitEpoch, err := preForkState.EarliestExitEpoch()
+	require.NoError(t, err)
+	postEarliestExitEpoch, err := mSt.EarliestExitEpoch()
+	require.NoError(t, err)
+	require.Equal(t, preEarliestExitEpoch, postEarliestExitEpoch)
+
+	preConsolidationBalanceToConsume, err := preForkState.ConsolidationBalanceToConsume()
+	require.NoError(t, err)
+	postConsolidationBalanceToConsume, err := mSt.ConsolidationBalanceToConsume()
+	require.NoError(t, err)
+	require.Equal(t, preConsolidationBalanceToConsume, postConsolidationBalanceToConsume)
+
+	preEarliesConsolidationEoch, err := preForkState.EarliestConsolidationEpoch()
+	require.NoError(t, err)
+	postEarliestConsolidationEpoch, err := mSt.EarliestConsolidationEpoch()
+	require.NoError(t, err)
+	require.Equal(t, preEarliesConsolidationEoch, postEarliestConsolidationEpoch)
+
+	prePendingDeposits, err := preForkState.PendingDeposits()
+	require.NoError(t, err)
+	postPendingDeposits, err := mSt.PendingDeposits()
+	require.NoError(t, err)
+	require.DeepSSZEqual(t, prePendingDeposits, postPendingDeposits)
+
+	prePendingPartialWithdrawals, err := preForkState.PendingPartialWithdrawals()
+	require.NoError(t, err)
+	postPendingPartialWithdrawals, err := mSt.PendingPartialWithdrawals()
+	require.NoError(t, err)
+	require.DeepSSZEqual(t, prePendingPartialWithdrawals, postPendingPartialWithdrawals)
+
+	prePendingConsolidations, err := preForkState.PendingConsolidations()
+	require.NoError(t, err)
+	postPendingConsolidations, err := mSt.PendingConsolidations()
+	require.NoError(t, err)
+	require.DeepSSZEqual(t, prePendingConsolidations, postPendingConsolidations)
+
+	_, err = mSt.Builder(0)
+	require.ErrorContains(t, "out of bounds", err)
+
+	for i := primitives.Slot(0); i < params.BeaconConfig().SlotsPerHistoricalRoot; i++ {
+		available, err := mSt.ExecutionPayloadAvailability(i)
+		require.NoError(t, err)
+		require.Equal(t, uint64(1), available)
+	}
+
+	bpp, err := mSt.BuilderPendingPayments()
+	require.NoError(t, err)
+	require.Equal(t, int(2*params.BeaconConfig().SlotsPerEpoch), len(bpp))
+
+	nbh, err := mSt.LatestBlockHash()
+	require.NoError(t, err)
+	require.DeepSSZEqual(t, blockHash, nbh[:])
+}

beacon-chain/core/peerdas/validator.go

@@ -73,23 +73,22 @@ func PopulateFromSidecar(sidecar blocks.VerifiedRODataColumn) *SidecarReconstruc
 
 // ValidatorsCustodyRequirement returns the number of custody groups regarding the validator indices attached to the beacon node.
 // https://github.com/ethereum/consensus-specs/blob/master/specs/fulu/validator.md#validator-custody
-func ValidatorsCustodyRequirement(state beaconState.ReadOnlyBeaconState, validatorsIndex map[primitives.ValidatorIndex]bool) (uint64, error) {
-	totalNodeBalance := uint64(0)
+func ValidatorsCustodyRequirement(st beaconState.ReadOnlyBalances, validatorsIndex map[primitives.ValidatorIndex]bool) (uint64, error) {
+	cfg := params.BeaconConfig()
+	idxs := make([]primitives.ValidatorIndex, 0, len(validatorsIndex))
 	for index := range validatorsIndex {
-		validator, err := state.ValidatorAtIndexReadOnly(index)
-		if err != nil {
-			return 0, errors.Wrapf(err, "validator at index %v", index)
-		}
-
-		totalNodeBalance += validator.EffectiveBalance()
+		idxs = append(idxs, index)
+	}
+	totalBalance, err := st.EffectiveBalanceSum(idxs)
+	if err != nil {
+		return 0, errors.Wrap(err, "effective balances")
 	}
 
-	cfg := params.BeaconConfig()
 	numberOfCustodyGroups := cfg.NumberOfCustodyGroups
 	validatorCustodyRequirement := cfg.ValidatorCustodyRequirement
 	balancePerAdditionalCustodyGroup := cfg.BalancePerAdditionalCustodyGroup
 
-	count := totalNodeBalance / balancePerAdditionalCustodyGroup
+	count := totalBalance / balancePerAdditionalCustodyGroup
 	return min(max(count, validatorCustodyRequirement), numberOfCustodyGroups), nil
 }
 

beacon-chain/core/time/slot_epoch.go

@@ -108,6 +108,15 @@ func CanUpgradeToFulu(slot primitives.Slot) bool {
 	return epochStart && fuluEpoch
 }
 
+// CanUpgradeToGloas returns true if the input `slot` can upgrade to Gloas.
+// Spec code:
+// If state.slot % SLOTS_PER_EPOCH == 0 and compute_epoch_at_slot(state.slot) == GLOAS_FORK_EPOCH
+func CanUpgradeToGloas(slot primitives.Slot) bool {
+	epochStart := slots.IsEpochStart(slot)
+	gloasEpoch := slots.ToEpoch(slot) == params.BeaconConfig().GloasForkEpoch
+	return epochStart && gloasEpoch
+}
+
 // CanProcessEpoch checks the eligibility to process epoch.
 // The epoch can be processed at the end of the last slot of every epoch.
 //

beacon-chain/core/transition/BUILD.bazel

@@ -26,6 +26,7 @@ go_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/gloas:go_default_library",
         "//beacon-chain/core/helpers:go_default_library",
         "//beacon-chain/core/requests:go_default_library",
         "//beacon-chain/core/time:go_default_library",

beacon-chain/core/transition/transition.go

@@ -17,6 +17,7 @@ import (
 	"github.com/OffchainLabs/prysm/v7/beacon-chain/core/epoch/precompute"
 	"github.com/OffchainLabs/prysm/v7/beacon-chain/core/execution"
 	"github.com/OffchainLabs/prysm/v7/beacon-chain/core/fulu"
+	"github.com/OffchainLabs/prysm/v7/beacon-chain/core/gloas"
 	"github.com/OffchainLabs/prysm/v7/beacon-chain/core/time"
 	"github.com/OffchainLabs/prysm/v7/beacon-chain/state"
 	"github.com/OffchainLabs/prysm/v7/config/features"
@@ -402,6 +403,15 @@ func UpgradeState(ctx context.Context, state state.BeaconState) (state.BeaconSta
 		upgraded = true
 	}
 
+	if time.CanUpgradeToGloas(slot) {
+		state, err = gloas.UpgradeToGloas(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/execution/BUILD.bazel

@@ -26,6 +26,7 @@ go_library(
         "//testing/spectest:__subpackages__",
     ],
     deps = [
+        "//api/server/structs:go_default_library",
         "//beacon-chain/blockchain/kzg:go_default_library",
         "//beacon-chain/cache:go_default_library",
         "//beacon-chain/cache/depositsnapshot:go_default_library",
@@ -101,6 +102,7 @@ go_test(
     data = glob(["testdata/**"]),
     embed = [":go_default_library"],
     deps = [
+        "//api/server/structs:go_default_library",
         "//async/event:go_default_library",
         "//beacon-chain/blockchain/kzg:go_default_library",
         "//beacon-chain/blockchain/testing:go_default_library",

beacon-chain/execution/engine_client.go

@@ -7,6 +7,7 @@ import (
 	"strings"
 	"time"
 
+	"github.com/OffchainLabs/prysm/v7/api/server/structs"
 	"github.com/OffchainLabs/prysm/v7/beacon-chain/blockchain/kzg"
 	"github.com/OffchainLabs/prysm/v7/beacon-chain/core/peerdas"
 	"github.com/OffchainLabs/prysm/v7/beacon-chain/execution/types"
@@ -109,6 +110,8 @@ const (
 	GetBlobsV1 = "engine_getBlobsV1"
 	// GetBlobsV2 request string for JSON-RPC.
 	GetBlobsV2 = "engine_getBlobsV2"
+	// GetClientVersionV1 is the JSON-RPC method that identifies the execution client.
+	GetClientVersionV1 = "engine_getClientVersionV1"
 	// Defines the seconds before timing out engine endpoints with non-block execution semantics.
 	defaultEngineTimeout = time.Second
 )
@@ -145,6 +148,7 @@ type EngineCaller interface {
 	GetPayload(ctx context.Context, payloadId [8]byte, slot primitives.Slot) (*blocks.GetPayloadResponse, error)
 	ExecutionBlockByHash(ctx context.Context, hash common.Hash, withTxs bool) (*pb.ExecutionBlock, error)
 	GetTerminalBlockHash(ctx context.Context, transitionTime uint64) ([]byte, bool, error)
+	GetClientVersionV1(ctx context.Context) ([]*structs.ClientVersionV1, error)
 }
 
 var ErrEmptyBlockHash = errors.New("Block hash is empty 0x0000...")
@@ -581,6 +585,39 @@ func (s *Service) GetBlobsV2(ctx context.Context, versionedHashes []common.Hash)
 	return result, handleRPCError(err)
 }
 
+func (s *Service) GetClientVersionV1(ctx context.Context) ([]*structs.ClientVersionV1, error) {
+	ctx, span := trace.StartSpan(ctx, "powchain.engine-api-client.GetClientVersionV1")
+	defer span.End()
+
+	commit := version.GitCommit()
+	if len(commit) >= 8 {
+		commit = commit[:8]
+	}
+
+	var result []*structs.ClientVersionV1
+	err := s.rpcClient.CallContext(
+		ctx,
+		&result,
+		GetClientVersionV1,
+		structs.ClientVersionV1{
+			Code:    "PM",
+			Name:    "Prysm",
+			Version: version.SemanticVersion(),
+			Commit:  commit,
+		},
+	)
+
+	if err != nil {
+		return nil, handleRPCError(err)
+	}
+
+	if len(result) == 0 {
+		return nil, errors.New("execution client returned no result")
+	}
+
+	return result, nil
+}
+
 // ReconstructFullBlock takes in a blinded beacon block and reconstructs
 // a beacon block with a full execution payload via the engine API.
 func (s *Service) ReconstructFullBlock(

beacon-chain/execution/engine_client_test.go

@@ -13,6 +13,7 @@ import (
 	"strings"
 	"testing"
 
+	"github.com/OffchainLabs/prysm/v7/api/server/structs"
 	"github.com/OffchainLabs/prysm/v7/beacon-chain/blockchain/kzg"
 	"github.com/OffchainLabs/prysm/v7/beacon-chain/core/peerdas"
 	"github.com/OffchainLabs/prysm/v7/beacon-chain/db/filesystem"
@@ -999,6 +1000,99 @@ func TestClient_HTTP(t *testing.T) {
 		require.NoError(t, err)
 		require.DeepEqual(t, want, resp)
 	})
+	t.Run(GetClientVersionV1, func(t *testing.T) {
+		tests := []struct {
+			name     string
+			want     any
+			resp     []*structs.ClientVersionV1
+			hasError bool
+			errMsg   string
+		}{
+			{
+				name: "happy path",
+				want: []*structs.ClientVersionV1{{
+					Code:    "GE",
+					Name:    "go-ethereum",
+					Version: "1.15.11-stable",
+					Commit:  "36b2371c",
+				}},
+				resp: []*structs.ClientVersionV1{{
+					Code:    "GE",
+					Name:    "go-ethereum",
+					Version: "1.15.11-stable",
+					Commit:  "36b2371c",
+				}},
+			},
+			{
+				name:     "empty response",
+				want:     []*structs.ClientVersionV1{},
+				hasError: true,
+				errMsg:   "execution client returned no result",
+			},
+			{
+				name:     "RPC error",
+				want:     "brokenMsg",
+				hasError: true,
+				errMsg:   "unexpected error in JSON-RPC",
+			},
+		}
+
+		for _, tc := range tests {
+			t.Run(tc.name, func(t *testing.T) {
+				srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+					w.Header().Set("Content-Type", "application/json")
+					defer func() {
+						require.NoError(t, r.Body.Close())
+					}()
+					enc, err := io.ReadAll(r.Body)
+					require.NoError(t, err)
+					jsonRequestString := string(enc)
+
+					// We expect the JSON string RPC request contains the right method name.
+					require.Equal(t, true, strings.Contains(
+						jsonRequestString, GetClientVersionV1,
+					))
+					require.Equal(t, true, strings.Contains(
+						jsonRequestString, "\"code\":\"PM\"",
+					))
+					require.Equal(t, true, strings.Contains(
+						jsonRequestString, "\"name\":\"Prysm\"",
+					))
+					require.Equal(t, true, strings.Contains(
+						jsonRequestString, fmt.Sprintf("\"version\":\"%s\"", version.SemanticVersion()),
+					))
+					require.Equal(t, true, strings.Contains(
+						jsonRequestString, fmt.Sprintf("\"commit\":\"%s\"", version.GitCommit()[:8]),
+					))
+					resp := map[string]any{
+						"jsonrpc": "2.0",
+						"id":      1,
+						"result":  tc.want,
+					}
+					err = json.NewEncoder(w).Encode(resp)
+					require.NoError(t, err)
+				}))
+				defer srv.Close()
+
+				rpcClient, err := rpc.DialHTTP(srv.URL)
+				require.NoError(t, err)
+				defer rpcClient.Close()
+
+				service := &Service{}
+				service.rpcClient = rpcClient
+
+				// We call the RPC method via HTTP and expect a proper result.
+				resp, err := service.GetClientVersionV1(ctx)
+				if tc.hasError {
+					require.NotNil(t, err)
+					require.ErrorContains(t, tc.errMsg, err)
+				} else {
+					require.NoError(t, err)
+				}
+				require.DeepEqual(t, tc.resp, resp)
+			})
+		}
+	})
 }
 
 func TestReconstructFullBellatrixBlock(t *testing.T) {

beacon-chain/execution/testing/BUILD.bazel

@@ -13,6 +13,7 @@ go_library(
         "//visibility:public",
     ],
     deps = [
+        "//api/server/structs:go_default_library",
         "//async/event:go_default_library",
         "//beacon-chain/core/peerdas:go_default_library",
         "//beacon-chain/execution/types:go_default_library",

beacon-chain/execution/testing/mock_engine_client.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"math/big"
 
+	"github.com/OffchainLabs/prysm/v7/api/server/structs"
 	"github.com/OffchainLabs/prysm/v7/beacon-chain/core/peerdas"
 	fieldparams "github.com/OffchainLabs/prysm/v7/config/fieldparams"
 	"github.com/OffchainLabs/prysm/v7/config/params"
@@ -42,6 +43,8 @@ type EngineClient struct {
 	ErrorBlobSidecars           error
 	DataColumnSidecars          []blocks.VerifiedRODataColumn
 	ErrorDataColumnSidecars     error
+	ClientVersion               []*structs.ClientVersionV1
+	ErrorClientVersion          error
 }
 
 // NewPayload --
@@ -173,3 +176,8 @@ func (e *EngineClient) GetTerminalBlockHash(ctx context.Context, transitionTime
 		blk = parentBlk
 	}
 }
+
+// GetClientVersionV1 --
+func (e *EngineClient) GetClientVersionV1(context.Context) ([]*structs.ClientVersionV1, error) {
+	return e.ClientVersion, e.ErrorClientVersion
+}

beacon-chain/rpc/endpoints.go

@@ -405,6 +405,7 @@ func (s *Service) nodeEndpoints() []endpoint {
 		MetadataProvider:          s.cfg.MetadataProvider,
 		HeadFetcher:               s.cfg.HeadFetcher,
 		ExecutionChainInfoFetcher: s.cfg.ExecutionChainInfoFetcher,
+		ExecutionEngineCaller:     s.cfg.ExecutionEngineCaller,
 	}
 
 	const namespace = "node"
@@ -469,6 +470,16 @@ func (s *Service) nodeEndpoints() []endpoint {
 			handler: server.GetVersion,
 			methods: []string{http.MethodGet},
 		},
+		{
+			template: "/eth/v2/node/version",
+			name:     namespace + ".GetVersionV2",
+			middleware: []middleware.Middleware{
+				middleware.AcceptHeaderHandler([]string{api.JsonMediaType}),
+				middleware.AcceptEncodingHeaderHandler(),
+			},
+			handler: server.GetVersionV2,
+			methods: []string{http.MethodGet},
+		},
 		{
 			template: "/eth/v1/node/health",
 			name:     namespace + ".GetHealth",

beacon-chain/rpc/endpoints_test.go

@@ -86,6 +86,7 @@ func Test_endpoints(t *testing.T) {
 		"/eth/v1/node/peers/{peer_id}": {http.MethodGet},
 		"/eth/v1/node/peer_count":      {http.MethodGet},
 		"/eth/v1/node/version":         {http.MethodGet},
+		"/eth/v2/node/version":         {http.MethodGet},
 		"/eth/v1/node/syncing":         {http.MethodGet},
 		"/eth/v1/node/health":          {http.MethodGet},
 	}

beacon-chain/rpc/eth/config/handlers_test.go

@@ -83,6 +83,7 @@ func TestGetSpec(t *testing.T) {
 	config.ElectraForkEpoch = 107
 	config.FuluForkVersion = []byte("FuluForkVersion")
 	config.FuluForkEpoch = 109
+	config.GloasForkVersion = []byte("GloasForkVersion")
 	config.GloasForkEpoch = 110
 	config.BLSWithdrawalPrefixByte = byte('b')
 	config.ETH1AddressWithdrawalPrefixByte = byte('c')
@@ -221,7 +222,7 @@ func TestGetSpec(t *testing.T) {
 	require.NoError(t, json.Unmarshal(writer.Body.Bytes(), &resp))
 	data, ok := resp.Data.(map[string]any)
 	require.Equal(t, true, ok)
-	assert.Equal(t, 192, len(data))
+	assert.Equal(t, 193, len(data))
 	for k, v := range data {
 		t.Run(k, func(t *testing.T) {
 			switch k {
@@ -301,6 +302,8 @@ func TestGetSpec(t *testing.T) {
 				assert.Equal(t, "0x"+hex.EncodeToString([]byte("FuluForkVersion")), v)
 			case "FULU_FORK_EPOCH":
 				assert.Equal(t, "109", v)
+			case "GLOAS_FORK_VERSION":
+				assert.Equal(t, "0x"+hex.EncodeToString([]byte("GloasForkVersion")), v)
 			case "GLOAS_FORK_EPOCH":
 				assert.Equal(t, "110", v)
 			case "MIN_ANCHOR_POW_BLOCK_DIFFICULTY":

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

@@ -5,6 +5,7 @@ go_library(
     srcs = [
         "handlers.go",
         "handlers_peers.go",
+        "log.go",
         "server.go",
     ],
     importpath = "github.com/OffchainLabs/prysm/v7/beacon-chain/rpc/eth/node",
@@ -30,6 +31,7 @@ go_library(
         "@com_github_ethereum_go_ethereum//common/hexutil:go_default_library",
         "@com_github_libp2p_go_libp2p//core/peer:go_default_library",
         "@com_github_pkg_errors//:go_default_library",
+        "@com_github_sirupsen_logrus//:go_default_library",
         "@org_golang_google_grpc//:go_default_library",
     ],
 )
@@ -44,6 +46,7 @@ go_test(
     deps = [
         "//api/server/structs:go_default_library",
         "//beacon-chain/blockchain/testing:go_default_library",
+        "//beacon-chain/execution/testing:go_default_library",
         "//beacon-chain/p2p:go_default_library",
         "//beacon-chain/p2p/peers:go_default_library",
         "//beacon-chain/p2p/testing:go_default_library",

beacon-chain/rpc/eth/node/handlers.go

@@ -103,6 +103,8 @@ func (s *Server) GetIdentity(w http.ResponseWriter, r *http.Request) {
 
 // GetVersion requests that the beacon node identify information about its implementation in a
 // format similar to a HTTP User-Agent field.
+//
+// Deprecated: in favour of GetVersionV2.
 func (*Server) GetVersion(w http.ResponseWriter, r *http.Request) {
 	_, span := trace.StartSpan(r.Context(), "node.GetVersion")
 	defer span.End()
@@ -116,6 +118,38 @@ func (*Server) GetVersion(w http.ResponseWriter, r *http.Request) {
 	httputil.WriteJson(w, resp)
 }
 
+// GetVersionV2 Retrieves structured information about the version of the beacon node and its attached
+// execution client in the same format as used on the Engine API
+func (s *Server) GetVersionV2(w http.ResponseWriter, r *http.Request) {
+	ctx, span := trace.StartSpan(r.Context(), "node.GetVersionV2")
+	defer span.End()
+
+	var elData *structs.ClientVersionV1
+	elDataList, err := s.ExecutionEngineCaller.GetClientVersionV1(ctx)
+	if err != nil {
+		log.WithError(err).WithField("endpoint", "GetVersionV2").Debug("Could not get execution client version")
+	} else if len(elDataList) > 0 {
+		elData = elDataList[0]
+	}
+
+	commit := version.GitCommit()
+	if len(commit) >= 8 {
+		commit = commit[:8]
+	}
+	resp := &structs.GetVersionV2Response{
+		Data: &structs.VersionV2{
+			BeaconNode: &structs.ClientVersionV1{
+				Code:    "PM",
+				Name:    "Prysm",
+				Version: version.SemanticVersion(),
+				Commit:  commit,
+			},
+			ExecutionClient: elData,
+		},
+	}
+	httputil.WriteJson(w, resp)
+}
+
 // GetHealth returns node health status in http status codes. Useful for load balancers.
 func (s *Server) GetHealth(w http.ResponseWriter, r *http.Request) {
 	ctx, span := trace.StartSpan(r.Context(), "node.GetHealth")

beacon-chain/rpc/eth/node/handlers_test.go

@@ -12,6 +12,7 @@ import (
 	"github.com/OffchainLabs/go-bitfield"
 	"github.com/OffchainLabs/prysm/v7/api/server/structs"
 	mock "github.com/OffchainLabs/prysm/v7/beacon-chain/blockchain/testing"
+	mockengine "github.com/OffchainLabs/prysm/v7/beacon-chain/execution/testing"
 	"github.com/OffchainLabs/prysm/v7/beacon-chain/p2p"
 	mockp2p "github.com/OffchainLabs/prysm/v7/beacon-chain/p2p/testing"
 	"github.com/OffchainLabs/prysm/v7/beacon-chain/rpc/testutil"
@@ -90,6 +91,75 @@ func TestGetVersion(t *testing.T) {
 	assert.StringContains(t, arch, resp.Data.Version)
 }
 
+func TestGetVersionV2(t *testing.T) {
+	t.Run("happy path", func(t *testing.T) {
+		request := httptest.NewRequest(http.MethodGet, "http://example.com/eth/v2/node/version", nil)
+		writer := httptest.NewRecorder()
+		writer.Body = &bytes.Buffer{}
+
+		s := &Server{
+			ExecutionEngineCaller: &mockengine.EngineClient{
+				ClientVersion: []*structs.ClientVersionV1{{
+					Code:    "EL",
+					Name:    "ExecutionClient",
+					Version: "v1.0.0",
+					Commit:  "abcdef12",
+				}},
+			},
+		}
+		s.GetVersionV2(writer, request)
+		require.Equal(t, http.StatusOK, writer.Code)
+
+		resp := &structs.GetVersionV2Response{}
+		require.NoError(t, json.Unmarshal(writer.Body.Bytes(), resp))
+		require.NotNil(t, resp)
+		require.NotNil(t, resp.Data)
+		require.NotNil(t, resp.Data.BeaconNode)
+		require.NotNil(t, resp.Data.ExecutionClient)
+		require.Equal(t, "EL", resp.Data.ExecutionClient.Code)
+		require.Equal(t, "ExecutionClient", resp.Data.ExecutionClient.Name)
+		require.Equal(t, "v1.0.0", resp.Data.ExecutionClient.Version)
+		require.Equal(t, "abcdef12", resp.Data.ExecutionClient.Commit)
+		require.Equal(t, "PM", resp.Data.BeaconNode.Code)
+		require.Equal(t, "Prysm", resp.Data.BeaconNode.Name)
+		require.Equal(t, version.SemanticVersion(), resp.Data.BeaconNode.Version)
+		require.Equal(t, true, len(resp.Data.BeaconNode.Commit) <= 8)
+	})
+
+	t.Run("unhappy path", func(t *testing.T) {
+		request := httptest.NewRequest(http.MethodGet, "http://example.com/eth/v2/node/version", nil)
+		writer := httptest.NewRecorder()
+		writer.Body = &bytes.Buffer{}
+
+		s := &Server{
+			ExecutionEngineCaller: &mockengine.EngineClient{
+				ClientVersion:      nil,
+				ErrorClientVersion: fmt.Errorf("error"),
+			},
+		}
+		s.GetVersionV2(writer, request)
+		require.Equal(t, http.StatusOK, writer.Code)
+
+		resp := &structs.GetVersionV2Response{}
+		require.NoError(t, json.Unmarshal(writer.Body.Bytes(), resp))
+		require.NotNil(t, resp)
+		require.NotNil(t, resp.Data)
+		require.NotNil(t, resp.Data.BeaconNode)
+		require.Equal(t, true, resp.Data.ExecutionClient == nil)
+
+		// make sure there is no 'execution_client' field
+		var payload map[string]any
+		require.NoError(t, json.Unmarshal(writer.Body.Bytes(), &payload))
+		data, ok := payload["data"].(map[string]any)
+		require.Equal(t, true, ok)
+		_, found := data["beacon_node"]
+		require.Equal(t, true, found)
+		_, found = data["execution_client"]
+		require.Equal(t, false, found)
+	})
+
+}
+
 func TestGetHealth(t *testing.T) {
 	checker := &syncmock.Sync{}
 	optimisticFetcher := &mock.ChainService{Optimistic: false}

beacon-chain/rpc/eth/node/log.go

@@ -0,0 +1,9 @@
+// Code generated by hack/gen-logs.sh; DO NOT EDIT.
+// This file is created and regenerated automatically. Anything added here might get removed.
+package node
+
+import "github.com/sirupsen/logrus"
+
+// The prefix for logs from this package will be the text after the last slash in the package path.
+// If you wish to change this, you should add your desired name in the runtime/logging/logrus-prefixed-formatter/prefix-replacement.go file.
+var log = logrus.WithField("package", "beacon-chain/rpc/eth/node")

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

@@ -26,4 +26,5 @@ type Server struct {
 	GenesisTimeFetcher        blockchain.TimeFetcher
 	HeadFetcher               blockchain.HeadFetcher
 	ExecutionChainInfoFetcher execution.ChainInfoFetcher
+	ExecutionEngineCaller     execution.EngineCaller
 }

beacon-chain/state/interfaces.go

@@ -152,6 +152,7 @@ type ReadOnlyBalances interface {
 	Balances() []uint64
 	BalanceAtIndex(idx primitives.ValidatorIndex) (uint64, error)
 	BalancesLength() int
+	EffectiveBalanceSum([]primitives.ValidatorIndex) (uint64, error)
 }
 
 // ReadOnlyCheckpoint defines a struct which only has read access to checkpoint methods.

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

@@ -8,6 +8,7 @@ import (
 	"github.com/OffchainLabs/prysm/v7/encoding/bytesutil"
 	ethpb "github.com/OffchainLabs/prysm/v7/proto/prysm/v1alpha1"
 	"github.com/OffchainLabs/prysm/v7/runtime/version"
+	"github.com/pkg/errors"
 )
 
 // Validators participating in consensus on the beacon chain.
@@ -80,6 +81,25 @@ func (b *BeaconState) ValidatorAtIndex(idx primitives.ValidatorIndex) (*ethpb.Va
 	return b.validatorAtIndex(idx)
 }
 
+// EffectiveBalances returns the sum of the effective balances of the given list of validator indices, the eb of each given validator, or an
+// error if one of the indices is out of bounds, or the state wasn't correctly initialized.
+func (b *BeaconState) EffectiveBalanceSum(idxs []primitives.ValidatorIndex) (uint64, error) {
+	b.lock.RLock()
+	defer b.lock.RUnlock()
+	var sum uint64
+	for i := range idxs {
+		if b.validatorsMultiValue == nil {
+			return 0, errors.Wrap(state.ErrNilValidatorsInState, "nil validators multi-value slice")
+		}
+		v, err := b.validatorsMultiValue.At(b, uint64(idxs[i]))
+		if err != nil {
+			return 0, errors.Wrap(err, "validators multi value at index")
+		}
+		sum += v.EffectiveBalance
+	}
+	return sum, nil
+}
+
 func (b *BeaconState) validatorAtIndex(idx primitives.ValidatorIndex) (*ethpb.Validator, error) {
 	if b.validatorsMultiValue == nil {
 		return &ethpb.Validator{}, nil

beacon-chain/state/stategen/mock/mock.go

@@ -5,6 +5,7 @@ import (
 	"context"
 
 	"github.com/OffchainLabs/prysm/v7/beacon-chain/state"
+	"github.com/OffchainLabs/prysm/v7/beacon-chain/state/stategen"
 	"github.com/OffchainLabs/prysm/v7/consensus-types/primitives"
 )
 
@@ -14,6 +15,8 @@ type StateManager struct {
 	StatesBySlot map[primitives.Slot]state.BeaconState
 }
 
+var _ stategen.StateManager = (*StateManager)(nil)
+
 // NewService --
 func NewService() *StateManager {
 	return &StateManager{
@@ -101,3 +104,8 @@ func (m *StateManager) AddStateForSlot(state state.BeaconState, slot primitives.
 func (m *StateManager) DeleteStateFromCaches(context.Context, [32]byte) error {
 	return nil
 }
+
+// FinalizedReadOnlyBalances --
+func (m *StateManager) FinalizedReadOnlyBalances() stategen.NilCheckableReadOnlyBalances {
+	panic("unimplemented")
+}

beacon-chain/state/stategen/service.go

@@ -27,6 +27,13 @@ var defaultHotStateDBInterval primitives.Slot = 128
 
 var populatePubkeyCacheOnce sync.Once
 
+// NilCheckableReadOnlyBalances adds the IsNil method to ReadOnlyBalances
+// to allow checking if the underlying state value is nil.
+type NilCheckableReadOnlyBalances interface {
+	state.ReadOnlyBalances
+	IsNil() bool
+}
+
 // StateManager represents a management object that handles the internal
 // logic of maintaining both hot and cold states in DB.
 type StateManager interface {
@@ -43,6 +50,7 @@ type StateManager interface {
 	ActiveNonSlashedBalancesByRoot(context.Context, [32]byte) ([]uint64, error)
 	StateByRootIfCachedNoCopy(blockRoot [32]byte) state.BeaconState
 	StateByRootInitialSync(ctx context.Context, blockRoot [32]byte) (state.BeaconState, error)
+	FinalizedReadOnlyBalances() NilCheckableReadOnlyBalances
 }
 
 // State is a concrete implementation of StateManager.
@@ -201,3 +209,8 @@ func (s *State) FinalizedState() state.BeaconState {
 	defer s.finalizedInfo.lock.RUnlock()
 	return s.finalizedInfo.state.Copy()
 }
+
+// Returns the finalized state as a ReadOnlyBalances so that it can be used read-only without copying.
+func (s *State) FinalizedReadOnlyBalances() NilCheckableReadOnlyBalances {
+	return s.finalizedInfo.state
+}

beacon-chain/sync/custody.go

@@ -185,7 +185,7 @@ func (s *Service) validatorsCustodyRequirement() (uint64, error) {
 	}
 
 	// Retrieve the finalized state.
-	finalizedState := s.cfg.stateGen.FinalizedState()
+	finalizedState := s.cfg.stateGen.FinalizedReadOnlyBalances()
 	if finalizedState == nil || finalizedState.IsNil() {
 		return 0, nilFinalizedStateError
 	}

beacon-chain/sync/validate_beacon_attestation.go

@@ -268,10 +268,23 @@ func (s *Service) validateCommitteeIndexAndCount(
 	a eth.Att,
 	bs state.ReadOnlyBeaconState,
 ) (primitives.CommitteeIndex, uint64, pubsub.ValidationResult, error) {
-	// - [REJECT] attestation.data.index == 0
-	if a.Version() >= version.Electra && a.GetData().CommitteeIndex != 0 {
-		return 0, 0, pubsub.ValidationReject, errors.New("attestation data's committee index must be 0")
+	// Validate committee index based on fork.
+	if a.Version() >= version.Electra {
+		data := a.GetData()
+		attEpoch := slots.ToEpoch(data.Slot)
+		postGloas := attEpoch >= params.BeaconConfig().GloasForkEpoch
+		if postGloas {
+			if result, err := s.validateGloasCommitteeIndex(data); result != pubsub.ValidationAccept {
+				return 0, 0, result, err
+			}
+		} else {
+			// [REJECT] attestation.data.index == 0 (New in Electra, removed in Gloas)
+			if data.CommitteeIndex != 0 {
+				return 0, 0, pubsub.ValidationReject, errors.New("attestation data's committee index must be 0")
+			}
+		}
 	}
+
 	valCount, err := helpers.ActiveValidatorCount(ctx, bs, slots.ToEpoch(a.GetData().Slot))
 	if err != nil {
 		return 0, 0, pubsub.ValidationIgnore, err
@@ -356,6 +369,29 @@ func validateAttestingIndex(
 	return pubsub.ValidationAccept, nil
 }
 
+// validateGloasCommitteeIndex validates committee index rules for Gloas fork.
+// [REJECT] attestation.data.index < 2. (New in Gloas)
+// [REJECT] attestation.data.index == 0 if block.slot == attestation.data.slot. (New in Gloas)
+func (s *Service) validateGloasCommitteeIndex(data *eth.AttestationData) (pubsub.ValidationResult, error) {
+	if data.CommitteeIndex >= 2 {
+		return pubsub.ValidationReject, errors.New("attestation data's committee index must be < 2")
+	}
+
+	// Same-slot attestations must use committee index 0
+	if data.CommitteeIndex != 0 {
+		blockRoot := bytesutil.ToBytes32(data.BeaconBlockRoot)
+		slot, err := s.cfg.chain.RecentBlockSlot(blockRoot)
+		if err != nil {
+			return pubsub.ValidationIgnore, err
+		}
+		if slot == data.Slot {
+			return pubsub.ValidationReject, errors.New("same slot attestations must use committee index 0")
+		}
+	}
+
+	return pubsub.ValidationAccept, nil
+}
+
 // generateUnaggregatedAttCacheKey generates the cache key for unaggregated attestation tracking.
 func generateUnaggregatedAttCacheKey(att eth.Att) (string, error) {
 	var attester uint64

beacon-chain/sync/validate_beacon_attestation_test.go

@@ -684,3 +684,75 @@ func Test_validateCommitteeIndexAndCount_Boundary(t *testing.T) {
 	require.ErrorContains(t, "committee index", err)
 	require.Equal(t, pubsub.ValidationReject, res)
 }
+
+func Test_validateGloasCommitteeIndex(t *testing.T) {
+	tests := []struct {
+		name           string
+		committeeIndex primitives.CommitteeIndex
+		attestationSlot primitives.Slot
+		blockSlot      primitives.Slot
+		wantResult     pubsub.ValidationResult
+		wantErr        string
+	}{
+		{
+			name:           "committee index >= 2 should reject",
+			committeeIndex: 2,
+			attestationSlot: 10,
+			blockSlot:      10,
+			wantResult:     pubsub.ValidationReject,
+			wantErr:        "committee index must be < 2",
+		},
+		{
+			name:           "committee index 0 should accept",
+			committeeIndex: 0,
+			attestationSlot: 10,
+			blockSlot:      10,
+			wantResult:     pubsub.ValidationAccept,
+			wantErr:        "",
+		},
+		{
+			name:           "committee index 1 different-slot should accept",
+			committeeIndex: 1,
+			attestationSlot: 10,
+			blockSlot:      9,
+			wantResult:     pubsub.ValidationAccept,
+			wantErr:        "",
+		},
+		{
+			name:           "committee index 1 same-slot should reject",
+			committeeIndex: 1,
+			attestationSlot: 10,
+			blockSlot:      10,
+			wantResult:     pubsub.ValidationReject,
+			wantErr:        "same slot attestations must use committee index 0",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			mockChain := &mockChain.ChainService{
+				BlockSlot: tt.blockSlot,
+			}
+			s := &Service{
+				cfg: &config{
+					chain: mockChain,
+				},
+			}
+
+			data := &ethpb.AttestationData{
+				Slot:            tt.attestationSlot,
+				CommitteeIndex:  tt.committeeIndex,
+				BeaconBlockRoot: bytesutil.PadTo([]byte("blockroot"), 32),
+			}
+
+			result, err := s.validateGloasCommitteeIndex(data)
+
+			require.Equal(t, tt.wantResult, result)
+			if tt.wantErr != "" {
+				require.ErrorContains(t, tt.wantErr, err)
+			} else {
+				require.NoError(t, err)
+			}
+		})
+	}
+}

changelog/bastin_get-version-v2.md

@@ -0,0 +1,3 @@
+### Added
+
+- New beacon API endpoint `eth/v2/node/version`.

changelog/bastin_gloas-state-upgrade.md

@@ -0,0 +1,4 @@
+### Added
+
+- Gloas Fork Version.
+- Gloas State Upgrade `UpgradeToGloas()`.

changelog/kasey_copy-free-balance-lookup.md

@@ -0,0 +1,2 @@
+### Fixed
+- Avoid copying the full finalized state every time we compute cgc.

changelog/terence_gloas-attestation-validation.md

@@ -0,0 +1,3 @@
+### Added
+
+- Add gossip beacon attestation validation conditions for Gloas fork

changelog/tt_apply_execution_payload.md

@@ -0,0 +1,2 @@
+### Ignored
+- Refactor ProcessExecutionPayload to ApplyExecutionPayload

config/params/config.go

@@ -192,6 +192,7 @@ type BeaconChainConfig struct {
 	ElectraForkEpoch     primitives.Epoch `yaml:"ELECTRA_FORK_EPOCH" spec:"true"`     // ElectraForkEpoch is used to represent the assigned fork epoch for electra.
 	FuluForkVersion      []byte           `yaml:"FULU_FORK_VERSION" spec:"true"`      // FuluForkVersion is used to represent the fork version for fulu.
 	FuluForkEpoch        primitives.Epoch `yaml:"FULU_FORK_EPOCH" spec:"true"`        // FuluForkEpoch is used to represent the assigned fork epoch for fulu.
+	GloasForkVersion     []byte           `yaml:"GLOAS_FORK_VERSION" spec:"true"`     // GloasForkVersion is used to represent the fork version for gloas.
 	GloasForkEpoch       primitives.Epoch `yaml:"GLOAS_FORK_EPOCH" spec:"true"`       // GloasForkEpoch is used to represent the assigned fork epoch for gloas.
 
 	ForkVersionSchedule map[[fieldparams.VersionLength]byte]primitives.Epoch // Schedule of fork epochs by version.

config/params/interop.go

@@ -13,6 +13,7 @@ func InteropConfig() *BeaconChainConfig {
 	c.DenebForkVersion = []byte{4, 0, 0, 235}
 	c.ElectraForkVersion = []byte{5, 0, 0, 235}
 	c.FuluForkVersion = []byte{6, 0, 0, 235}
+	c.GloasForkVersion = []byte{7, 0, 0, 235}
 
 	c.InitializeForkSchedule()
 	return c

config/params/loader.go

@@ -225,6 +225,7 @@ func ConfigToYaml(cfg *BeaconChainConfig) []byte {
 		fmt.Sprintf("FULU_FORK_EPOCH: %d", cfg.FuluForkEpoch),
 		fmt.Sprintf("FULU_FORK_VERSION: %#x", cfg.FuluForkVersion),
 		fmt.Sprintf("GLOAS_FORK_EPOCH: %d", cfg.GloasForkEpoch),
+		fmt.Sprintf("GLOAS_FORK_VERSION: %#x", cfg.GloasForkVersion),
 		fmt.Sprintf("EPOCHS_PER_SUBNET_SUBSCRIPTION: %d", cfg.EpochsPerSubnetSubscription),
 		fmt.Sprintf("ATTESTATION_SUBNET_EXTRA_BITS: %d", cfg.AttestationSubnetExtraBits),
 		fmt.Sprintf("ATTESTATION_SUBNET_PREFIX_BITS: %d", cfg.AttestationSubnetPrefixBits),

config/params/loader_test.go

@@ -184,6 +184,7 @@ func assertEqualConfigs(t *testing.T, name string, fields []string, expected, ac
 	assert.DeepEqual(t, expected.DenebForkVersion, actual.DenebForkVersion, "%s: DenebForkVersion", name)
 	assert.DeepEqual(t, expected.ElectraForkVersion, actual.ElectraForkVersion, "%s: ElectraForkVersion", name)
 	assert.DeepEqual(t, expected.FuluForkVersion, actual.FuluForkVersion, "%s: FuluForkVersion", name)
+	assert.DeepEqual(t, expected.GloasForkVersion, actual.GloasForkVersion, "%s: GloasForkVersion", name)
 
 	assertYamlFieldsMatch(t, name, fields, expected, actual)
 }

config/params/mainnet_config.go

@@ -241,6 +241,7 @@ var mainnetBeaconConfig = &BeaconChainConfig{
 	ElectraForkEpoch:     mainnetElectraForkEpoch,
 	FuluForkVersion:      []byte{6, 0, 0, 0},
 	FuluForkEpoch:        mainnetFuluForkEpoch,
+	GloasForkVersion:     []byte{7, 0, 0, 0},
 	GloasForkEpoch:       mainnetGloasForkEpoch,
 
 	// New values introduced in Altair hard fork 1.

config/params/minimal_config.go

@@ -103,6 +103,7 @@ func MinimalSpecConfig() *BeaconChainConfig {
 	minimalConfig.ElectraForkEpoch = math.MaxUint64
 	minimalConfig.FuluForkVersion = []byte{6, 0, 0, 1}
 	minimalConfig.FuluForkEpoch = math.MaxUint64
+	minimalConfig.GloasForkVersion = []byte{7, 0, 0, 1}
 	minimalConfig.GloasForkEpoch = minimalConfig.FarFutureEpoch
 
 	minimalConfig.SyncCommitteeSize = 32

runtime/version/version.go

@@ -34,8 +34,17 @@ func SemanticVersion() string {
 	return gitTag
 }
 
+// GitCommit returns the current build commit hash.
+func GitCommit() string {
+	return resolvedGitCommit()
+}
+
 // BuildData returns the git tag and commit of the current build.
 func BuildData() string {
+	return fmt.Sprintf("Prysm/%s/%s", gitTag, resolvedGitCommit())
+}
+
+func resolvedGitCommit() string {
 	// if doing a local build, these values are not interpolated
 	if gitCommit == "{STABLE_GIT_COMMIT}" {
 		commit, err := exec.Command("git", "rev-parse", "HEAD").Output()
@@ -45,7 +54,7 @@ func BuildData() string {
 			gitCommit = strings.TrimRight(string(commit), "\r\n")
 		}
 	}
-	return fmt.Sprintf("Prysm/%s/%s", gitTag, gitCommit)
+	return gitCommit
 }
 
 // GetCommitPrefix returns the first 4 characters of the git commit.

testing/spectest/shared/common/forkchoice/BUILD.bazel

@@ -12,6 +12,7 @@ go_library(
     importpath = "github.com/OffchainLabs/prysm/v7/testing/spectest/shared/common/forkchoice",
     visibility = ["//testing/spectest:__subpackages__"],
     deps = [
+        "//api/server/structs:go_default_library",
         "//beacon-chain/blockchain:go_default_library",
         "//beacon-chain/blockchain/kzg:go_default_library",
         "//beacon-chain/blockchain/testing:go_default_library",

testing/spectest/shared/common/forkchoice/service.go

@@ -5,6 +5,7 @@ import (
 	"math/big"
 	"testing"
 
+	"github.com/OffchainLabs/prysm/v7/api/server/structs"
 	"github.com/OffchainLabs/prysm/v7/beacon-chain/blockchain"
 	"github.com/OffchainLabs/prysm/v7/beacon-chain/blockchain/kzg"
 	mock "github.com/OffchainLabs/prysm/v7/beacon-chain/blockchain/testing"
@@ -141,3 +142,7 @@ func (m *engineMock) ExecutionBlockByHash(_ context.Context, hash common.Hash, _
 func (m *engineMock) GetTerminalBlockHash(context.Context, uint64) ([]byte, bool, error) {
 	return nil, false, nil
 }
+
+func (m *engineMock) GetClientVersionV1(context.Context) ([]*structs.ClientVersionV1, error) {
+	return nil, nil
+}