fixing test

Resolved conflict in beacon-chain/blockchain/process_block.go where both
branches modified the postBlockProcess function. Kept the blockProcessed
flag logic while incorporating upstream changes.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>
Co-authored-by: Sculptor <sculptor@imbue.com>

beacon-chain/blockchain/kzg/kzg.go

@@ -109,6 +109,7 @@ func VerifyCellKZGProofBatch(commitmentsBytes []Bytes48, cellIndices []uint64, c
 }
 
 // RecoverCellsAndKZGProofs recovers the complete cells and KZG proofs from a given set of cell indices and partial cells.
+// Note: `len(cellIndices)` must be equal to `len(partialCells)` and `cellIndices` must be sorted in ascending order.
 func RecoverCellsAndKZGProofs(cellIndices []uint64, partialCells []Cell) (CellsAndProofs, error) {
 	// Convert `Cell` type to `ckzg4844.Cell`
 	ckzgPartialCells := make([]ckzg4844.Cell, len(partialCells))

beacon-chain/blockchain/process_block.go

@@ -72,7 +72,13 @@ func (s *Service) postBlockProcess(cfg *postBlockProcessConfig) error {
 	if features.Get().EnableLightClient && slots.ToEpoch(s.CurrentSlot()) >= params.BeaconConfig().AltairForkEpoch {
 		defer s.processLightClientUpdates(cfg)
 	}
-	defer s.sendStateFeedOnBlock(cfg)
+	// Track whether block processing succeeded to only send event on success
+	var blockProcessed bool
+	defer func() {
+		if blockProcessed {
+			s.sendStateFeedOnBlock(cfg)
+		}
+	}()
 	defer reportProcessingTime(startTime)
 	defer reportAttestationInclusion(cfg.roblock.Block())
 
@@ -101,16 +107,22 @@ func (s *Service) postBlockProcess(cfg *postBlockProcessConfig) error {
 	newBlockHeadElapsedTime.Observe(float64(time.Since(start).Milliseconds()))
 	if cfg.headRoot != cfg.roblock.Root() {
 		s.logNonCanonicalBlockReceived(cfg.roblock.Root(), cfg.headRoot)
+		// Mark as processed even for non-canonical blocks that succeed
+		blockProcessed = true
 		return nil
 	}
 	if err := s.getFCUArgs(cfg, fcuArgs); err != nil {
 		log.WithError(err).Error("Could not get forkchoice update argument")
+		// Mark as processed - block was successfully inserted even if FCU args failed
+		blockProcessed = true
 		return nil
 	}
 	if err := s.sendFCU(cfg, fcuArgs); err != nil {
 		return errors.Wrap(err, "could not send FCU to engine")
 	}
 
+	// Block successfully processed
+	blockProcessed = true
 	return nil
 }
 

beacon-chain/blockchain/process_block_test.go

@@ -9,8 +9,10 @@ import (
 	"testing"
 	"time"
 
+	mock "github.com/OffchainLabs/prysm/v6/beacon-chain/blockchain/testing"
 	"github.com/OffchainLabs/prysm/v6/beacon-chain/cache"
 	"github.com/OffchainLabs/prysm/v6/beacon-chain/core/blocks"
+	statefeed "github.com/OffchainLabs/prysm/v6/beacon-chain/core/feed/state"
 	"github.com/OffchainLabs/prysm/v6/beacon-chain/core/helpers"
 	"github.com/OffchainLabs/prysm/v6/beacon-chain/core/peerdas"
 	"github.com/OffchainLabs/prysm/v6/beacon-chain/core/signing"
@@ -3462,3 +3464,156 @@ func TestProcessLightClientFinalityUpdate(t *testing.T) {
 		}
 	}
 }
+
+// Test_postBlockProcess_EventSending tests that block processed events are only sent
+// when block processing succeeds according to the decision tree:
+//
+// Block Processing Flow:
+// ├─ InsertNode FAILS (fork choice timeout)
+// │  └─ blockProcessed = false ❌ NO EVENT
+// │
+// ├─ InsertNode succeeds
+// │  ├─ handleBlockAttestations FAILS
+// │  │  └─ blockProcessed = false ❌ NO EVENT
+// │  │
+// │  ├─ Block is NON-CANONICAL (not head)
+// │  │  └─ blockProcessed = true ✅ SEND EVENT (Line 111)
+// │  │
+// │  ├─ Block IS CANONICAL (new head)
+// │  │  ├─ getFCUArgs FAILS
+// │  │  │  └─ blockProcessed = true ✅ SEND EVENT (Line 117)
+// │  │  │
+// │  │  ├─ sendFCU FAILS
+// │  │  │  └─ blockProcessed = false ❌ NO EVENT
+// │  │  │
+// │  │  └─ Full success
+// │  │     └─ blockProcessed = true ✅ SEND EVENT (Line 125)
+func Test_postBlockProcess_EventSending(t *testing.T) {
+	ctx := context.Background()
+
+	// Helper to create a minimal valid block and state
+	createTestBlockAndState := func(t *testing.T, slot primitives.Slot, parentRoot [32]byte) (consensusblocks.ROBlock, state.BeaconState) {
+		st, _ := util.DeterministicGenesisState(t, 64)
+		require.NoError(t, st.SetSlot(slot))
+
+		stateRoot, err := st.HashTreeRoot(ctx)
+		require.NoError(t, err)
+
+		blk := util.NewBeaconBlock()
+		blk.Block.Slot = slot
+		blk.Block.ProposerIndex = 0
+		blk.Block.ParentRoot = parentRoot[:]
+		blk.Block.StateRoot = stateRoot[:]
+
+		signed := util.HydrateSignedBeaconBlock(blk)
+		roBlock, err := consensusblocks.NewSignedBeaconBlock(signed)
+		require.NoError(t, err)
+
+		roBlk, err := consensusblocks.NewROBlock(roBlock)
+		require.NoError(t, err)
+		return roBlk, st
+	}
+
+	tests := []struct {
+		name          string
+		setupService  func(*Service, [32]byte)
+		expectEvent   bool
+		expectError   bool
+		errorContains string
+	}{
+		{
+			name: "Block successfully processed - sends event",
+			setupService: func(s *Service, blockRoot [32]byte) {
+				// Default setup should work
+			},
+			expectEvent: true,
+			expectError: false,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			// Create service with required options
+			opts := testServiceOptsWithDB(t)
+			service, err := NewService(ctx, opts...)
+			require.NoError(t, err)
+
+			// Initialize fork choice with genesis block
+			st, _ := util.DeterministicGenesisState(t, 64)
+			require.NoError(t, st.SetSlot(0))
+			genesisBlock := util.NewBeaconBlock()
+			genesisBlock.Block.StateRoot = bytesutil.PadTo([]byte("genesisState"), 32)
+			signedGenesis := util.HydrateSignedBeaconBlock(genesisBlock)
+			block, err := consensusblocks.NewSignedBeaconBlock(signedGenesis)
+			require.NoError(t, err)
+			genesisRoot, err := block.Block().HashTreeRoot()
+			require.NoError(t, err)
+			require.NoError(t, service.cfg.BeaconDB.SaveBlock(ctx, block))
+			require.NoError(t, service.cfg.BeaconDB.SaveGenesisBlockRoot(ctx, genesisRoot))
+			require.NoError(t, service.cfg.BeaconDB.SaveState(ctx, st, genesisRoot))
+
+			genesisROBlock, err := consensusblocks.NewROBlock(block)
+			require.NoError(t, err)
+			require.NoError(t, service.cfg.ForkChoiceStore.InsertNode(ctx, st, genesisROBlock))
+
+			// Create test block and state with genesis as parent
+			roBlock, postSt := createTestBlockAndState(t, 100, genesisRoot)
+
+			// Apply additional service setup if provided
+			if tt.setupService != nil {
+				tt.setupService(service, roBlock.Root())
+			}
+
+			// Create post block process config
+			cfg := &postBlockProcessConfig{
+				ctx:            ctx,
+				roblock:        roBlock,
+				postState:      postSt,
+				isValidPayload: true,
+			}
+
+			// Execute postBlockProcess
+			err = service.postBlockProcess(cfg)
+
+			// Check error expectation
+			if tt.expectError {
+				require.NotNil(t, err)
+				if tt.errorContains != "" {
+					require.ErrorContains(t, tt.errorContains, err)
+				}
+			} else {
+				require.NoError(t, err)
+			}
+
+			// Give a moment for deferred functions to execute
+			time.Sleep(10 * time.Millisecond)
+
+			// Check event expectation
+			notifier := service.cfg.StateNotifier.(*mock.MockStateNotifier)
+			events := notifier.ReceivedEvents()
+
+			if tt.expectEvent {
+				require.NotEqual(t, 0, len(events), "Expected event to be sent but none were received")
+
+				// Verify it's a BlockProcessed event
+				foundBlockProcessed := false
+				for _, evt := range events {
+					if evt.Type == statefeed.BlockProcessed {
+						foundBlockProcessed = true
+						data, ok := evt.Data.(*statefeed.BlockProcessedData)
+						require.Equal(t, true, ok, "Event data should be BlockProcessedData")
+						require.Equal(t, roBlock.Root(), data.BlockRoot, "Event should contain correct block root")
+						break
+					}
+				}
+				require.Equal(t, true, foundBlockProcessed, "Expected BlockProcessed event type")
+			} else {
+				// For no-event cases, verify no BlockProcessed events were sent
+				for _, evt := range events {
+					require.NotEqual(t, statefeed.BlockProcessed, evt.Type,
+						"Expected no BlockProcessed event but one was sent")
+				}
+			}
+		})
+	}
+}

beacon-chain/core/blocks/attester_slashing.go

@@ -42,6 +42,9 @@ func ProcessAttesterSlashings(
 	slashings []ethpb.AttSlashing,
 	exitInfo *validators.ExitInfo,
 ) (state.BeaconState, error) {
+	if exitInfo == nil && len(slashings) > 0 {
+		return nil, errors.New("exit info required to process attester slashings")
+	}
 	var err error
 	for _, slashing := range slashings {
 		beaconState, err = ProcessAttesterSlashing(ctx, beaconState, slashing, exitInfo)
@@ -59,6 +62,9 @@ func ProcessAttesterSlashing(
 	slashing ethpb.AttSlashing,
 	exitInfo *validators.ExitInfo,
 ) (state.BeaconState, error) {
+	if exitInfo == nil {
+		return nil, errors.New("exit info is required to process attester slashing")
+	}
 	if err := VerifyAttesterSlashing(ctx, beaconState, slashing); err != nil {
 		return nil, errors.Wrap(err, "could not verify attester slashing")
 	}

beacon-chain/core/blocks/exit.go

@@ -55,6 +55,9 @@ func ProcessVoluntaryExits(
 	if len(exits) == 0 {
 		return beaconState, nil
 	}
+	if exitInfo == nil {
+		return nil, errors.New("exit info required to process voluntary exits")
+	}
 	for idx, exit := range exits {
 		if exit == nil || exit.Exit == nil {
 			return nil, errors.New("nil voluntary exit in block body")

beacon-chain/core/blocks/proposer_slashing.go

@@ -51,6 +51,9 @@ func ProcessProposerSlashings(
 	slashings []*ethpb.ProposerSlashing,
 	exitInfo *validators.ExitInfo,
 ) (state.BeaconState, error) {
+	if exitInfo == nil && len(slashings) > 0 {
+		return nil, errors.New("exit info required to process proposer slashings")
+	}
 	var err error
 	for _, slashing := range slashings {
 		beaconState, err = ProcessProposerSlashing(ctx, beaconState, slashing, exitInfo)
@@ -75,6 +78,9 @@ func ProcessProposerSlashing(
 	if err = VerifyProposerSlashing(beaconState, slashing); err != nil {
 		return nil, errors.Wrap(err, "could not verify proposer slashing")
 	}
+	if exitInfo == nil {
+		return nil, errors.New("exit info is required to process proposer slashing")
+	}
 	beaconState, err = validators.SlashValidator(ctx, beaconState, slashing.Header_1.Header.ProposerIndex, exitInfo)
 	if err != nil {
 		return nil, errors.Wrapf(err, "could not slash proposer index %d", slashing.Header_1.Header.ProposerIndex)

beacon-chain/core/electra/transition_no_verify_sig.go

@@ -53,9 +53,15 @@ func ProcessOperations(ctx context.Context, st state.BeaconState, block interfac
 	// 6110 validations are in VerifyOperationLengths
 	bb := block.Body()
 	// Electra extends the altair operations.
-	exitInfo := v.ExitInformation(st)
-	if err := helpers.UpdateTotalActiveBalanceCache(st, exitInfo.TotalActiveBalance); err != nil {
-		return nil, errors.Wrap(err, "could not update total active balance cache")
+	var exitInfo *v.ExitInfo
+	hasSlashings := len(bb.ProposerSlashings()) > 0 || len(bb.AttesterSlashings()) > 0
+	hasExits := len(bb.VoluntaryExits()) > 0
+	if hasSlashings || hasExits {
+		// ExitInformation is expensive to compute, only do it if we need it.
+		exitInfo = v.ExitInformation(st)
+		if err := helpers.UpdateTotalActiveBalanceCache(st, exitInfo.TotalActiveBalance); err != nil {
+			return nil, errors.Wrap(err, "could not update total active balance cache")
+		}
 	}
 	st, err = ProcessProposerSlashings(ctx, st, bb.ProposerSlashings(), exitInfo)
 	if err != nil {

beacon-chain/core/electra/withdrawals.go

@@ -13,6 +13,7 @@ import (
 	"github.com/OffchainLabs/prysm/v6/monitoring/tracing/trace"
 	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/OffchainLabs/prysm/v6/time/slots"
 	"github.com/ethereum/go-ethereum/common/hexutil"
 	"github.com/pkg/errors"
@@ -91,6 +92,18 @@ func ProcessWithdrawalRequests(ctx context.Context, st state.BeaconState, wrs []
 	ctx, span := trace.StartSpan(ctx, "electra.ProcessWithdrawalRequests")
 	defer span.End()
 	currentEpoch := slots.ToEpoch(st.Slot())
+	if len(wrs) == 0 {
+		return st, nil
+	}
+	// It is correct to compute exitInfo once for all withdrawals in the block, as the ExitInfo pointer is
+	// updated within InitiateValidatorExit which is the only function that uses it.
+	var exitInfo *validators.ExitInfo
+	if st.Version() < version.Electra {
+		exitInfo = validators.ExitInformation(st)
+	} else {
+		// After Electra, the function InitiateValidatorExit ignores the exitInfo passed to it and recomputes it anyway.
+		exitInfo = &validators.ExitInfo{}
+	}
 	for _, wr := range wrs {
 		if wr == nil {
 			return nil, errors.New("nil execution layer withdrawal request")
@@ -148,7 +161,8 @@ func ProcessWithdrawalRequests(ctx context.Context, st state.BeaconState, wrs []
 			// Only exit validator if it has no pending withdrawals in the queue
 			if pendingBalanceToWithdraw == 0 {
 				var err error
-				st, err = validators.InitiateValidatorExit(ctx, st, vIdx, validators.ExitInformation(st))
+				// exitInfo is updated within InitiateValidatorExit
+				st, err = validators.InitiateValidatorExit(ctx, st, vIdx, exitInfo)
 				if err != nil {
 					return nil, err
 				}

beacon-chain/core/epoch/epoch_processing.go

@@ -96,12 +96,17 @@ func ProcessRegistryUpdates(ctx context.Context, st state.BeaconState) (state.Be
 	}
 
 	// Process validators eligible for ejection.
-	for _, idx := range eligibleForEjection {
-		// Here is fine to do a quadratic loop since this should
-		// barely happen
-		st, err = validators.InitiateValidatorExit(ctx, st, idx, validators.ExitInformation(st))
-		if err != nil && !errors.Is(err, validators.ErrValidatorAlreadyExited) {
-			return nil, errors.Wrapf(err, "could not initiate exit for validator %d", idx)
+	if len(eligibleForEjection) > 0 {
+		// It is safe to compute exitInfo once for all ejections in the epoch, as the ExitInfo pointer is
+		// updated within InitiateValidatorExit which is the only function that uses it.
+		exitInfo := validators.ExitInformation(st)
+		for _, idx := range eligibleForEjection {
+			// Here is fine to do a quadratic loop since this should
+			// barely happen
+			st, err = validators.InitiateValidatorExit(ctx, st, idx, exitInfo)
+			if err != nil && !errors.Is(err, validators.ErrValidatorAlreadyExited) {
+				return nil, errors.Wrapf(err, "could not initiate exit for validator %d", idx)
+			}
 		}
 	}
 

beacon-chain/core/helpers/beacon_committee.go

@@ -399,7 +399,6 @@ func CommitteeAssignments(ctx context.Context, state state.BeaconState, epoch pr
 	ctx, span := trace.StartSpan(ctx, "helpers.CommitteeAssignments")
 	defer span.End()
 
-	// Verify if the epoch is valid for assignment based on the provided state.
 	if err := VerifyAssignmentEpoch(epoch, state); err != nil {
 		return nil, err
 	}
@@ -407,12 +406,15 @@ func CommitteeAssignments(ctx context.Context, state state.BeaconState, epoch pr
 	if err != nil {
 		return nil, err
 	}
-	vals := make(map[primitives.ValidatorIndex]struct{})
+
+	// Deduplicate and make set for O(1) membership checks.
+	vals := make(map[primitives.ValidatorIndex]struct{}, len(validators))
 	for _, v := range validators {
 		vals[v] = struct{}{}
 	}
-	assignments := make(map[primitives.ValidatorIndex]*CommitteeAssignment)
-	// Compute committee assignments for each slot in the epoch.
+	remaining := len(vals)
+
+	assignments := make(map[primitives.ValidatorIndex]*CommitteeAssignment, len(vals))
 	for slot := startSlot; slot < startSlot+params.BeaconConfig().SlotsPerEpoch; slot++ {
 		committees, err := BeaconCommittees(ctx, state, slot)
 		if err != nil {
@@ -420,7 +422,7 @@ func CommitteeAssignments(ctx context.Context, state state.BeaconState, epoch pr
 		}
 		for j, committee := range committees {
 			for _, vIndex := range committee {
-				if _, ok := vals[vIndex]; !ok { // Skip if the validator is not in the provided validators slice.
+				if _, ok := vals[vIndex]; !ok {
 					continue
 				}
 				if _, ok := assignments[vIndex]; !ok {
@@ -429,6 +431,11 @@ func CommitteeAssignments(ctx context.Context, state state.BeaconState, epoch pr
 				assignments[vIndex].Committee = committee
 				assignments[vIndex].AttesterSlot = slot
 				assignments[vIndex].CommitteeIndex = primitives.CommitteeIndex(j)
+				delete(vals, vIndex)
+				remaining--
+				if remaining == 0 {
+					return assignments, nil // early exit
+				}
 			}
 		}
 	}

beacon-chain/core/peerdas/reconstruction.go

@@ -1,6 +1,8 @@
 package peerdas
 
 import (
+	"sort"
+
 	"github.com/OffchainLabs/prysm/v6/beacon-chain/blockchain/kzg"
 	fieldparams "github.com/OffchainLabs/prysm/v6/config/fieldparams"
 	"github.com/OffchainLabs/prysm/v6/config/params"
@@ -28,7 +30,8 @@ func MinimumColumnCountToReconstruct() uint64 {
 
 // ReconstructDataColumnSidecars reconstructs all the data column sidecars from the given input data column sidecars.
 // All input sidecars must be committed to the same block.
-// `inVerifiedRoSidecars` should contain enough (unique) sidecars to reconstruct the missing columns.
+// `inVerifiedRoSidecars` should contain enough sidecars to reconstruct the missing columns, and should not contain any duplicate.
+// WARNING: This function sorts inplace `verifiedRoSidecars` by index.
 func ReconstructDataColumnSidecars(verifiedRoSidecars []blocks.VerifiedRODataColumn) ([]blocks.VerifiedRODataColumn, error) {
 	// Check if there is at least one input sidecar.
 	if len(verifiedRoSidecars) == 0 {
@@ -51,18 +54,17 @@ func ReconstructDataColumnSidecars(verifiedRoSidecars []blocks.VerifiedRODataCol
 		}
 	}
 
-	// Deduplicate sidecars.
-	sidecarByIndex := make(map[uint64]blocks.VerifiedRODataColumn, len(verifiedRoSidecars))
-	for _, inVerifiedRoSidecar := range verifiedRoSidecars {
-		sidecarByIndex[inVerifiedRoSidecar.Index] = inVerifiedRoSidecar
-	}
-
 	// Check if there is enough sidecars to reconstruct the missing columns.
-	sidecarCount := len(sidecarByIndex)
+	sidecarCount := len(verifiedRoSidecars)
 	if uint64(sidecarCount) < MinimumColumnCountToReconstruct() {
 		return nil, ErrNotEnoughDataColumnSidecars
 	}
 
+	// Sort the input sidecars by index.
+	sort.Slice(verifiedRoSidecars, func(i, j int) bool {
+		return verifiedRoSidecars[i].Index < verifiedRoSidecars[j].Index
+	})
+
 	// Recover cells and compute proofs in parallel.
 	var wg errgroup.Group
 	cellsAndProofs := make([]kzg.CellsAndProofs, blobCount)
@@ -71,10 +73,10 @@ func ReconstructDataColumnSidecars(verifiedRoSidecars []blocks.VerifiedRODataCol
 			cellsIndices := make([]uint64, 0, sidecarCount)
 			cells := make([]kzg.Cell, 0, sidecarCount)
 
-			for columnIndex, sidecar := range sidecarByIndex {
+			for _, sidecar := range verifiedRoSidecars {
 				cell := sidecar.Column[blobIndex]
 				cells = append(cells, kzg.Cell(cell))
-				cellsIndices = append(cellsIndices, columnIndex)
+				cellsIndices = append(cellsIndices, sidecar.Index)
 			}
 
 			// Recover the cells and proofs for the corresponding blob

beacon-chain/core/transition/transition_no_verify_sig.go

@@ -10,6 +10,7 @@ import (
 	"github.com/OffchainLabs/prysm/v6/beacon-chain/core/electra"
 	"github.com/OffchainLabs/prysm/v6/beacon-chain/core/helpers"
 	"github.com/OffchainLabs/prysm/v6/beacon-chain/core/transition/interop"
+	"github.com/OffchainLabs/prysm/v6/beacon-chain/core/validators"
 	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"
@@ -378,9 +379,16 @@ func ProcessBlockForStateRoot(
 func altairOperations(ctx context.Context, st state.BeaconState, beaconBlock interfaces.ReadOnlyBeaconBlock) (state.BeaconState, error) {
 	var err error
 
-	exitInfo := v.ExitInformation(st)
-	if err := helpers.UpdateTotalActiveBalanceCache(st, exitInfo.TotalActiveBalance); err != nil {
-		return nil, errors.Wrap(err, "could not update total active balance cache")
+	hasSlashings := len(beaconBlock.Body().ProposerSlashings()) > 0 || len(beaconBlock.Body().AttesterSlashings()) > 0
+	// exitInfo is only needed for voluntary exits pre Electra.
+	hasExits := st.Version() < version.Electra && len(beaconBlock.Body().VoluntaryExits()) > 0
+	exitInfo := &validators.ExitInfo{}
+	if hasSlashings || hasExits {
+		// ExitInformation is expensive to compute, only do it if we need it.
+		exitInfo = v.ExitInformation(st)
+		if err := helpers.UpdateTotalActiveBalanceCache(st, exitInfo.TotalActiveBalance); err != nil {
+			return nil, errors.Wrap(err, "could not update total active balance cache")
+		}
 	}
 	st, err = b.ProcessProposerSlashings(ctx, st, beaconBlock.Body().ProposerSlashings(), exitInfo)
 	if err != nil {
@@ -407,10 +415,15 @@ func altairOperations(ctx context.Context, st state.BeaconState, beaconBlock int
 // This calls phase 0 block operations.
 func phase0Operations(ctx context.Context, st state.BeaconState, beaconBlock interfaces.ReadOnlyBeaconBlock) (state.BeaconState, error) {
 	var err error
-
-	exitInfo := v.ExitInformation(st)
-	if err := helpers.UpdateTotalActiveBalanceCache(st, exitInfo.TotalActiveBalance); err != nil {
-		return nil, errors.Wrap(err, "could not update total active balance cache")
+	hasSlashings := len(beaconBlock.Body().ProposerSlashings()) > 0 || len(beaconBlock.Body().AttesterSlashings()) > 0
+	hasExits := len(beaconBlock.Body().VoluntaryExits()) > 0
+	var exitInfo *v.ExitInfo
+	if hasSlashings || hasExits {
+		// ExitInformation is expensive to compute, only do it if we need it.
+		exitInfo = v.ExitInformation(st)
+		if err := helpers.UpdateTotalActiveBalanceCache(st, exitInfo.TotalActiveBalance); err != nil {
+			return nil, errors.Wrap(err, "could not update total active balance cache")
+		}
 	}
 	st, err = b.ProcessProposerSlashings(ctx, st, beaconBlock.Body().ProposerSlashings(), exitInfo)
 	if err != nil {

beacon-chain/core/validators/validator.go

@@ -98,7 +98,9 @@ func InitiateValidatorExit(
 	if validator.ExitEpoch != params.BeaconConfig().FarFutureEpoch {
 		return s, ErrValidatorAlreadyExited
 	}
-
+	if exitInfo == nil {
+		return nil, errors.New("exit info is required to process validator exit")
+	}
 	// Compute exit queue epoch.
 	if s.Version() < version.Electra {
 		if err = initiateValidatorExitPreElectra(ctx, s, exitInfo); err != nil {
@@ -177,6 +179,9 @@ func initiateValidatorExitPreElectra(ctx context.Context, s state.BeaconState, e
 	//	if exit_queue_churn >= get_validator_churn_limit(state):
 	//	    exit_queue_epoch += Epoch(1)
 	exitableEpoch := helpers.ActivationExitEpoch(time.CurrentEpoch(s))
+	if exitInfo == nil {
+		return errors.New("exit info is required to process validator exit")
+	}
 	if exitableEpoch > exitInfo.HighestExitEpoch {
 		exitInfo.HighestExitEpoch = exitableEpoch
 		exitInfo.Churn = 0
@@ -235,7 +240,9 @@ func SlashValidator(
 	exitInfo *ExitInfo,
 ) (state.BeaconState, error) {
 	var err error
-
+	if exitInfo == nil {
+		return nil, errors.New("exit info is required to slash validator")
+	}
 	s, err = InitiateValidatorExitForTotalBal(ctx, s, slashedIdx, exitInfo, primitives.Gwei(exitInfo.TotalActiveBalance))
 	if err != nil && !errors.Is(err, ErrValidatorAlreadyExited) {
 		return nil, errors.Wrapf(err, "could not initiate validator %d exit", slashedIdx)

beacon-chain/light-client/store.go

@@ -254,6 +254,7 @@ func (s *Store) getCacheUpdatesByPeriod(headBlock interfaces.ReadOnlySignedBeaco
 	return updatesByPeriod, nil
 }
 
+// SetLastFinalityUpdate should be used only for testing.
 func (s *Store) SetLastFinalityUpdate(update interfaces.LightClientFinalityUpdate, broadcast bool) {
 	s.mu.Lock()
 	defer s.mu.Unlock()
@@ -283,6 +284,7 @@ func (s *Store) LastFinalityUpdate() interfaces.LightClientFinalityUpdate {
 	return s.lastFinalityUpdate
 }
 
+// SetLastOptimisticUpdate should be used only for testing.
 func (s *Store) SetLastOptimisticUpdate(update interfaces.LightClientOptimisticUpdate, broadcast bool) {
 	s.mu.Lock()
 	defer s.mu.Unlock()

beacon-chain/rpc/eth/rewards/service.go

@@ -68,7 +68,11 @@ func (rs *BlockRewardService) GetBlockRewardsData(ctx context.Context, blk inter
 			Code:    http.StatusInternalServerError,
 		}
 	}
-	exitInfo := validators.ExitInformation(st)
+	var exitInfo *validators.ExitInfo
+	if len(blk.Body().ProposerSlashings()) > 0 || len(blk.Body().AttesterSlashings()) > 0 {
+		// ExitInformation is expensive to compute, only do it if we need it.
+		exitInfo = validators.ExitInformation(st)
+	}
 	st, err = coreblocks.ProcessAttesterSlashings(ctx, st, blk.Body().AttesterSlashings(), exitInfo)
 	if err != nil {
 		return nil, &httputil.DefaultJsonError{

beacon-chain/rpc/prysm/v1alpha1/validator/duties_v2.go

@@ -17,13 +17,6 @@ import (
 	"google.golang.org/grpc/status"
 )
 
-const (
-	// validatorLookupThreshold determines when to use full assignment map vs cached linear search.
-	// For requests with fewer validators, we use cached linear search to avoid the overhead
-	// of building a complete assignment map for all validators in the epoch.
-	validatorLookupThreshold = 3000
-)
-
 // GetDutiesV2 returns the duties assigned to a list of validators specified
 // in the request object.
 //
@@ -60,7 +53,26 @@ func (vs *Server) dutiesv2(ctx context.Context, req *ethpb.DutiesRequest) (*ethp
 	span.SetAttributes(trace.Int64Attribute("num_pubkeys", int64(len(req.PublicKeys))))
 	defer span.End()
 
-	meta, err := loadDutiesMetadata(ctx, s, req.Epoch, len(req.PublicKeys))
+	// Collect validator indices from public keys and cache the lookups
+	type validatorInfo struct {
+		index primitives.ValidatorIndex
+		found bool
+	}
+	validatorLookup := make(map[string]validatorInfo, len(req.PublicKeys))
+	requestIndices := make([]primitives.ValidatorIndex, 0, len(req.PublicKeys))
+
+	for _, pubKey := range req.PublicKeys {
+		key := string(pubKey)
+		if _, exists := validatorLookup[key]; !exists {
+			idx, ok := s.ValidatorIndexByPubkey(bytesutil.ToBytes48(pubKey))
+			validatorLookup[key] = validatorInfo{index: idx, found: ok}
+			if ok {
+				requestIndices = append(requestIndices, idx)
+			}
+		}
+	}
+
+	meta, err := loadDutiesMetadata(ctx, s, req.Epoch, requestIndices)
 	if err != nil {
 		return nil, err
 	}
@@ -68,14 +80,14 @@ func (vs *Server) dutiesv2(ctx context.Context, req *ethpb.DutiesRequest) (*ethp
 	validatorAssignments := make([]*ethpb.DutiesV2Response_Duty, 0, len(req.PublicKeys))
 	nextValidatorAssignments := make([]*ethpb.DutiesV2Response_Duty, 0, len(req.PublicKeys))
 
-	// start loop for assignments for current and next epochs
+	// Build duties using cached validator index lookups
 	for _, pubKey := range req.PublicKeys {
 		if ctx.Err() != nil {
 			return nil, status.Errorf(codes.Aborted, "Could not continue fetching assignments: %v", ctx.Err())
 		}
 
-		validatorIndex, ok := s.ValidatorIndexByPubkey(bytesutil.ToBytes48(pubKey))
-		if !ok {
+		info := validatorLookup[string(pubKey)]
+		if !info.found {
 			unknownDuty := &ethpb.DutiesV2Response_Duty{
 				PublicKey: pubKey,
 				Status:    ethpb.ValidatorStatus_UNKNOWN_STATUS,
@@ -85,16 +97,15 @@ func (vs *Server) dutiesv2(ctx context.Context, req *ethpb.DutiesRequest) (*ethp
 			continue
 		}
 
-		meta.current.liteAssignment = vs.getValidatorAssignment(meta.current, validatorIndex)
+		currentAssignment := vs.getValidatorAssignment(meta.current, info.index)
+		nextAssignment := vs.getValidatorAssignment(meta.next, info.index)
 
-		meta.next.liteAssignment = vs.getValidatorAssignment(meta.next, validatorIndex)
-
-		assignment, nextAssignment, err := vs.buildValidatorDuty(pubKey, validatorIndex, s, req.Epoch, meta)
+		assignment, nextDuty, err := vs.buildValidatorDuty(pubKey, info.index, s, req.Epoch, meta, currentAssignment, nextAssignment)
 		if err != nil {
 			return nil, err
 		}
 		validatorAssignments = append(validatorAssignments, assignment)
-		nextValidatorAssignments = append(nextValidatorAssignments, nextAssignment)
+		nextValidatorAssignments = append(nextValidatorAssignments, nextDuty)
 	}
 
 	// Dependent roots for fork choice
@@ -147,18 +158,15 @@ type dutiesMetadata struct {
 }
 
 type metadata struct {
-	committeesAtSlot       uint64
-	proposalSlots          map[primitives.ValidatorIndex][]primitives.Slot
-	startSlot              primitives.Slot
-	committeesBySlot       [][][]primitives.ValidatorIndex
-	validatorAssignmentMap map[primitives.ValidatorIndex]*helpers.LiteAssignment
-	liteAssignment         *helpers.LiteAssignment
+	committeesAtSlot     uint64
+	proposalSlots        map[primitives.ValidatorIndex][]primitives.Slot
+	committeeAssignments map[primitives.ValidatorIndex]*helpers.CommitteeAssignment
 }
 
-func loadDutiesMetadata(ctx context.Context, s state.BeaconState, reqEpoch primitives.Epoch, numValidators int) (*dutiesMetadata, error) {
+func loadDutiesMetadata(ctx context.Context, s state.BeaconState, reqEpoch primitives.Epoch, requestIndices []primitives.ValidatorIndex) (*dutiesMetadata, error) {
 	meta := &dutiesMetadata{}
 	var err error
-	meta.current, err = loadMetadata(ctx, s, reqEpoch, numValidators)
+	meta.current, err = loadMetadata(ctx, s, reqEpoch, requestIndices)
 	if err != nil {
 		return nil, err
 	}
@@ -168,14 +176,14 @@ func loadDutiesMetadata(ctx context.Context, s state.BeaconState, reqEpoch primi
 		return nil, status.Errorf(codes.Internal, "Could not compute proposer slots: %v", err)
 	}
 
-	meta.next, err = loadMetadata(ctx, s, reqEpoch+1, numValidators)
+	meta.next, err = loadMetadata(ctx, s, reqEpoch+1, requestIndices)
 	if err != nil {
 		return nil, err
 	}
 	return meta, nil
 }
 
-func loadMetadata(ctx context.Context, s state.BeaconState, reqEpoch primitives.Epoch, numValidators int) (*metadata, error) {
+func loadMetadata(ctx context.Context, s state.BeaconState, reqEpoch primitives.Epoch, requestIndices []primitives.ValidatorIndex) (*metadata, error) {
 	meta := &metadata{}
 
 	if err := helpers.VerifyAssignmentEpoch(reqEpoch, s); err != nil {
@@ -188,56 +196,36 @@ func loadMetadata(ctx context.Context, s state.BeaconState, reqEpoch primitives.
 	}
 	meta.committeesAtSlot = helpers.SlotCommitteeCount(activeValidatorCount)
 
-	meta.startSlot, err = slots.EpochStart(reqEpoch)
+	// Use CommitteeAssignments which only computes committees for requested validators
+	meta.committeeAssignments, err = helpers.CommitteeAssignments(ctx, s, reqEpoch, requestIndices)
 	if err != nil {
-		return nil, err
-	}
-
-	meta.committeesBySlot, err = helpers.PrecomputeCommittees(ctx, s, meta.startSlot)
-	if err != nil {
-		return nil, err
-	}
-
-	if numValidators >= validatorLookupThreshold {
-		meta.validatorAssignmentMap = buildValidatorAssignmentMap(meta.committeesBySlot, meta.startSlot)
+		return nil, status.Errorf(codes.Internal, "Could not compute committee assignments: %v", err)
 	}
 
 	return meta, nil
 }
 
-// buildValidatorAssignmentMap creates a map from validator index to assignment for O(1) lookup.
-func buildValidatorAssignmentMap(
-	bySlot [][][]primitives.ValidatorIndex,
-	startSlot primitives.Slot,
-) map[primitives.ValidatorIndex]*helpers.LiteAssignment {
-	validatorToAssignment := make(map[primitives.ValidatorIndex]*helpers.LiteAssignment)
-
-	for relativeSlot, committees := range bySlot {
-		for cIdx, committee := range committees {
-			for pos, vIdx := range committee {
-				validatorToAssignment[vIdx] = &helpers.LiteAssignment{
-					AttesterSlot:            startSlot + primitives.Slot(relativeSlot),
-					CommitteeIndex:          primitives.CommitteeIndex(cIdx),
-					CommitteeLength:         uint64(len(committee)),
-					ValidatorCommitteeIndex: uint64(pos),
-				}
-			}
+// findValidatorIndexInCommittee finds the position of a validator in a committee.
+func findValidatorIndexInCommittee(committee []primitives.ValidatorIndex, validatorIndex primitives.ValidatorIndex) uint64 {
+	for i, vIdx := range committee {
+		if vIdx == validatorIndex {
+			return uint64(i)
 		}
 	}
-	return validatorToAssignment
+	return 0
 }
 
-// getValidatorAssignment retrieves the assignment for a validator using either
-// the pre-built assignment map (for large requests) or linear search (for small requests).
+// getValidatorAssignment retrieves the assignment for a validator from CommitteeAssignments.
 func (vs *Server) getValidatorAssignment(meta *metadata, validatorIndex primitives.ValidatorIndex) *helpers.LiteAssignment {
-	if meta.validatorAssignmentMap != nil {
-		if assignment, exists := meta.validatorAssignmentMap[validatorIndex]; exists {
-			return assignment
+	if assignment, exists := meta.committeeAssignments[validatorIndex]; exists {
+		return &helpers.LiteAssignment{
+			AttesterSlot:            assignment.AttesterSlot,
+			CommitteeIndex:          assignment.CommitteeIndex,
+			CommitteeLength:         uint64(len(assignment.Committee)),
+			ValidatorCommitteeIndex: findValidatorIndexInCommittee(assignment.Committee, validatorIndex),
 		}
-		return &helpers.LiteAssignment{}
 	}
-
-	return helpers.AssignmentForValidator(meta.committeesBySlot, meta.startSlot, validatorIndex)
+	return &helpers.LiteAssignment{}
 }
 
 // buildValidatorDuty builds both current‑epoch and next‑epoch V2 duty objects
@@ -248,21 +236,23 @@ func (vs *Server) buildValidatorDuty(
 	s state.BeaconState,
 	reqEpoch primitives.Epoch,
 	meta *dutiesMetadata,
+	currentAssignment *helpers.LiteAssignment,
+	nextAssignment *helpers.LiteAssignment,
 ) (*ethpb.DutiesV2Response_Duty, *ethpb.DutiesV2Response_Duty, error) {
 	assignment := &ethpb.DutiesV2Response_Duty{PublicKey: pubKey}
-	nextAssignment := &ethpb.DutiesV2Response_Duty{PublicKey: pubKey}
+	nextDuty := &ethpb.DutiesV2Response_Duty{PublicKey: pubKey}
 
 	statusEnum := assignmentStatus(s, idx)
 	assignment.ValidatorIndex = idx
 	assignment.Status = statusEnum
 	assignment.CommitteesAtSlot = meta.current.committeesAtSlot
 	assignment.ProposerSlots = meta.current.proposalSlots[idx]
-	populateCommitteeFields(assignment, meta.current.liteAssignment)
+	populateCommitteeFields(assignment, currentAssignment)
 
-	nextAssignment.ValidatorIndex = idx
-	nextAssignment.Status = statusEnum
-	nextAssignment.CommitteesAtSlot = meta.next.committeesAtSlot
-	populateCommitteeFields(nextAssignment, meta.next.liteAssignment)
+	nextDuty.ValidatorIndex = idx
+	nextDuty.Status = statusEnum
+	nextDuty.CommitteesAtSlot = meta.next.committeesAtSlot
+	populateCommitteeFields(nextDuty, nextAssignment)
 
 	// Sync committee flags
 	if coreTime.HigherEqualThanAltairVersionAndEpoch(s, reqEpoch) {
@@ -271,7 +261,7 @@ func (vs *Server) buildValidatorDuty(
 			return nil, nil, status.Errorf(codes.Internal, "Could not determine current epoch sync committee: %v", err)
 		}
 		assignment.IsSyncCommittee = inSync
-		nextAssignment.IsSyncCommittee = inSync
+		nextDuty.IsSyncCommittee = inSync
 		if inSync {
 			if err := core.RegisterSyncSubnetCurrentPeriodProto(s, reqEpoch, pubKey, statusEnum); err != nil {
 				return nil, nil, status.Errorf(codes.Internal, "Could not register sync subnet current period: %v", err)
@@ -290,18 +280,16 @@ func (vs *Server) buildValidatorDuty(
 			if err != nil {
 				return nil, nil, status.Errorf(codes.Internal, "Could not determine next epoch sync committee: %v", err)
 			}
-			nextAssignment.IsSyncCommittee = nextInSync
+			nextDuty.IsSyncCommittee = nextInSync
 			if nextInSync {
-				go func() {
-					if err := core.RegisterSyncSubnetNextPeriodProto(s, reqEpoch, pubKey, statusEnum); err != nil {
-						log.WithError(err).Warn("Could not register sync subnet next period")
-					}
-				}()
+				if err := core.RegisterSyncSubnetNextPeriodProto(s, reqEpoch, pubKey, statusEnum); err != nil {
+					log.WithError(err).Warn("Could not register sync subnet next period")
+				}
 			}
 		}
 	}
 
-	return assignment, nextAssignment, nil
+	return assignment, nextDuty, nil
 }
 
 func populateCommitteeFields(duty *ethpb.DutiesV2Response_Duty, la *helpers.LiteAssignment) {

beacon-chain/rpc/prysm/v1alpha1/validator/duties_v2_test.go

@@ -560,105 +560,20 @@ func TestGetDutiesV2_SyncNotReady(t *testing.T) {
 	assert.ErrorContains(t, "Syncing to latest head", err)
 }
 
-func TestBuildValidatorAssignmentMap(t *testing.T) {
-	start := primitives.Slot(200)
-	bySlot := [][][]primitives.ValidatorIndex{
-		{{1, 2, 3}},        // slot 200, committee 0
-		{{7, 8, 9}},        // slot 201, committee 0
-		{{4, 5}, {10, 11}}, // slot 202, committee 0 & 1
-	}
-
-	assignmentMap := buildValidatorAssignmentMap(bySlot, start)
-
-	// Test validator 8 assignment (slot 201, committee 0, position 1)
-	vIdx := primitives.ValidatorIndex(8)
-	got, exists := assignmentMap[vIdx]
-	assert.Equal(t, true, exists)
-	require.NotNil(t, got)
-	assert.Equal(t, start+1, got.AttesterSlot)
-	assert.Equal(t, primitives.CommitteeIndex(0), got.CommitteeIndex)
-	assert.Equal(t, uint64(3), got.CommitteeLength)
-	assert.Equal(t, uint64(1), got.ValidatorCommitteeIndex)
-
-	// Test validator 1 assignment (slot 200, committee 0, position 0)
-	vIdx1 := primitives.ValidatorIndex(1)
-	got1, exists1 := assignmentMap[vIdx1]
-	assert.Equal(t, true, exists1)
-	require.NotNil(t, got1)
-	assert.Equal(t, start, got1.AttesterSlot)
-	assert.Equal(t, primitives.CommitteeIndex(0), got1.CommitteeIndex)
-	assert.Equal(t, uint64(3), got1.CommitteeLength)
-	assert.Equal(t, uint64(0), got1.ValidatorCommitteeIndex)
-
-	// Test validator 10 assignment (slot 202, committee 1, position 0)
-	vIdx10 := primitives.ValidatorIndex(10)
-	got10, exists10 := assignmentMap[vIdx10]
-	assert.Equal(t, true, exists10)
-	require.NotNil(t, got10)
-	assert.Equal(t, start+2, got10.AttesterSlot)
-	assert.Equal(t, primitives.CommitteeIndex(1), got10.CommitteeIndex)
-	assert.Equal(t, uint64(2), got10.CommitteeLength)
-	assert.Equal(t, uint64(0), got10.ValidatorCommitteeIndex)
-
-	// Test non-existent validator
-	_, exists99 := assignmentMap[primitives.ValidatorIndex(99)]
-	assert.Equal(t, false, exists99)
-
-	// Verify that we get the same results as the linear search
-	for _, committees := range bySlot {
-		for _, committee := range committees {
-			for _, validatorIdx := range committee {
-				linearResult := helpers.AssignmentForValidator(bySlot, start, validatorIdx)
-				mapResult, mapExists := assignmentMap[validatorIdx]
-				assert.Equal(t, true, mapExists)
-				require.DeepEqual(t, linearResult, mapResult)
-			}
-		}
-	}
-}
-
-func TestGetValidatorAssignment_WithAssignmentMap(t *testing.T) {
+func TestGetValidatorAssignment(t *testing.T) {
 	start := primitives.Slot(100)
-	bySlot := [][][]primitives.ValidatorIndex{
-		{{1, 2, 3}},
-		{{4, 5, 6}},
+
+	// Test using CommitteeAssignments
+	committeeAssignments := map[primitives.ValidatorIndex]*helpers.CommitteeAssignment{
+		5: {
+			Committee:      []primitives.ValidatorIndex{4, 5, 6},
+			AttesterSlot:   start + 1,
+			CommitteeIndex: primitives.CommitteeIndex(0),
+		},
 	}
 
-	// Test with pre-built assignment map (large request scenario)
 	meta := &metadata{
-		startSlot:              start,
-		committeesBySlot:       bySlot,
-		validatorAssignmentMap: buildValidatorAssignmentMap(bySlot, start),
-	}
-
-	vs := &Server{}
-
-	// Test existing validator (validator 2 is at position 1 in the committee, not position 2)
-	assignment := vs.getValidatorAssignment(meta, primitives.ValidatorIndex(2))
-	require.NotNil(t, assignment)
-	assert.Equal(t, start, assignment.AttesterSlot)
-	assert.Equal(t, primitives.CommitteeIndex(0), assignment.CommitteeIndex)
-	assert.Equal(t, uint64(1), assignment.ValidatorCommitteeIndex)
-
-	// Test non-existent validator should return empty assignment
-	assignment = vs.getValidatorAssignment(meta, primitives.ValidatorIndex(99))
-	require.NotNil(t, assignment)
-	assert.Equal(t, primitives.Slot(0), assignment.AttesterSlot)
-	assert.Equal(t, primitives.CommitteeIndex(0), assignment.CommitteeIndex)
-}
-
-func TestGetValidatorAssignment_WithoutAssignmentMap(t *testing.T) {
-	start := primitives.Slot(100)
-	bySlot := [][][]primitives.ValidatorIndex{
-		{{1, 2, 3}},
-		{{4, 5, 6}},
-	}
-
-	// Test without assignment map (small request scenario)
-	meta := &metadata{
-		startSlot:              start,
-		committeesBySlot:       bySlot,
-		validatorAssignmentMap: nil, // No map - should use linear search
+		committeeAssignments: committeeAssignments,
 	}
 
 	vs := &Server{}
@@ -676,53 +591,3 @@ func TestGetValidatorAssignment_WithoutAssignmentMap(t *testing.T) {
 	assert.Equal(t, primitives.Slot(0), assignment.AttesterSlot)
 	assert.Equal(t, primitives.CommitteeIndex(0), assignment.CommitteeIndex)
 }
-
-func TestLoadMetadata_ThresholdBehavior(t *testing.T) {
-	state, _ := util.DeterministicGenesisState(t, 128)
-	epoch := primitives.Epoch(0)
-
-	tests := []struct {
-		name                string
-		numValidators       int
-		expectAssignmentMap bool
-	}{
-		{
-			name:                "Small request - below threshold",
-			numValidators:       100,
-			expectAssignmentMap: false,
-		},
-		{
-			name:                "Large request - at threshold",
-			numValidators:       validatorLookupThreshold,
-			expectAssignmentMap: true,
-		},
-		{
-			name:                "Large request - above threshold",
-			numValidators:       validatorLookupThreshold + 1000,
-			expectAssignmentMap: true,
-		},
-	}
-
-	for _, tt := range tests {
-		t.Run(tt.name, func(t *testing.T) {
-			meta, err := loadMetadata(t.Context(), state, epoch, tt.numValidators)
-			require.NoError(t, err)
-			require.NotNil(t, meta)
-
-			if tt.expectAssignmentMap {
-				require.NotNil(t, meta.validatorAssignmentMap, "Expected assignment map to be built for large requests")
-				assert.Equal(t, true, len(meta.validatorAssignmentMap) > 0, "Assignment map should not be empty")
-			} else {
-				// For small requests, the map should be nil (not initialized)
-				if meta.validatorAssignmentMap != nil {
-					t.Errorf("Expected no assignment map for small requests, got: %v", meta.validatorAssignmentMap)
-				}
-			}
-
-			// Common fields should always be set
-			assert.Equal(t, true, meta.committeesAtSlot > 0)
-			require.NotNil(t, meta.committeesBySlot)
-			assert.Equal(t, true, len(meta.committeesBySlot) > 0)
-		})
-	}
-}

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

@@ -12,13 +12,18 @@ import (
 
 func (vs *Server) getSlashings(ctx context.Context, head state.BeaconState) ([]*ethpb.ProposerSlashing, []ethpb.AttSlashing) {
 	var err error
-
+	proposerSlashings := vs.SlashingsPool.PendingProposerSlashings(ctx, head, false /*noLimit*/)
+	attSlashings := vs.SlashingsPool.PendingAttesterSlashings(ctx, head, false /*noLimit*/)
+	validProposerSlashings := make([]*ethpb.ProposerSlashing, 0, len(proposerSlashings))
+	validAttSlashings := make([]ethpb.AttSlashing, 0, len(attSlashings))
+	if len(proposerSlashings) == 0 && len(attSlashings) == 0 {
+		return validProposerSlashings, validAttSlashings
+	}
+	// ExitInformation is expensive to compute, only do it if we need it.
 	exitInfo := v.ExitInformation(head)
 	if err := helpers.UpdateTotalActiveBalanceCache(head, exitInfo.TotalActiveBalance); err != nil {
 		log.WithError(err).Warn("Could not update total active balance cache")
 	}
-	proposerSlashings := vs.SlashingsPool.PendingProposerSlashings(ctx, head, false /*noLimit*/)
-	validProposerSlashings := make([]*ethpb.ProposerSlashing, 0, len(proposerSlashings))
 	for _, slashing := range proposerSlashings {
 		_, err = blocks.ProcessProposerSlashing(ctx, head, slashing, exitInfo)
 		if err != nil {
@@ -27,8 +32,6 @@ func (vs *Server) getSlashings(ctx context.Context, head state.BeaconState) ([]*
 		}
 		validProposerSlashings = append(validProposerSlashings, slashing)
 	}
-	attSlashings := vs.SlashingsPool.PendingAttesterSlashings(ctx, head, false /*noLimit*/)
-	validAttSlashings := make([]ethpb.AttSlashing, 0, len(attSlashings))
 	for _, slashing := range attSlashings {
 		_, err = blocks.ProcessAttesterSlashing(ctx, head, slashing, exitInfo)
 		if err != nil {

beacon-chain/sync/BUILD.bazel

@@ -45,7 +45,6 @@ go_library(
         "subscriber_bls_to_execution_change.go",
         "subscriber_data_column_sidecar.go",
         "subscriber_handlers.go",
-        "subscriber_light_client.go",
         "subscriber_sync_committee_message.go",
         "subscriber_sync_contribution_proof.go",
         "subscription_topic_handler.go",
@@ -113,7 +112,6 @@ go_library(
         "//config/params:go_default_library",
         "//consensus-types/blocks:go_default_library",
         "//consensus-types/interfaces:go_default_library",
-        "//consensus-types/light-client:go_default_library",
         "//consensus-types/primitives:go_default_library",
         "//consensus-types/wrapper:go_default_library",
         "//container/leaky-bucket:go_default_library",

beacon-chain/sync/pending_attestations_queue.go

@@ -4,9 +4,8 @@ import (
 	"bytes"
 	"context"
 	"encoding/hex"
-	"sync"
+	"fmt"
 
-	"github.com/OffchainLabs/prysm/v6/async"
 	"github.com/OffchainLabs/prysm/v6/beacon-chain/blockchain"
 	"github.com/OffchainLabs/prysm/v6/beacon-chain/core/feed"
 	"github.com/OffchainLabs/prysm/v6/beacon-chain/core/feed/operation"
@@ -24,70 +23,51 @@ import (
 	"github.com/sirupsen/logrus"
 )
 
-// This defines how often a node cleans up and processes pending attestations in the queue.
-var processPendingAttsPeriod = slots.DivideSlotBy(2 /* twice per slot */)
-var pendingAttsLimit = 10000
+var pendingAttsLimit = 32768
 
-// This processes pending attestation queues on every processPendingAttsPeriod.
-func (s *Service) runPendingAttsQueue() {
-	// Prevents multiple queue processing goroutines (invoked by RunEvery) from contending for data.
-	mutex := new(sync.Mutex)
-	async.RunEvery(s.ctx, processPendingAttsPeriod, func() {
-		mutex.Lock()
-		if err := s.processPendingAtts(s.ctx); err != nil {
-			log.WithError(err).Debug("Could not process pending attestation")
-		}
-		mutex.Unlock()
-	})
-}
-
-// This defines how pending attestations are processed. It contains features:
-// 1. Clean up invalid pending attestations from the queue.
-// 2. Check if pending attestations can be processed when the block has arrived.
-// 3. Request block from a random peer if unable to proceed step 2.
-func (s *Service) processPendingAtts(ctx context.Context) error {
-	ctx, span := trace.StartSpan(ctx, "processPendingAtts")
+// This method processes pending attestations as a "known" block as arrived. With validations,
+// the valid attestations get saved into the operation mem pool, and the invalid attestations gets deleted
+// from the sync pending pool.
+func (s *Service) processPendingAttsForBlock(ctx context.Context, bRoot [32]byte) error {
+	ctx, span := trace.StartSpan(ctx, "processPendingAttsForBlock")
 	defer span.End()
 
+	// Confirm that the pending attestation's missing block arrived and the node processed the block.
+	if !s.cfg.beaconDB.HasBlock(ctx, bRoot) || !(s.cfg.beaconDB.HasState(ctx, bRoot) || s.cfg.beaconDB.HasStateSummary(ctx, bRoot)) || !s.cfg.chain.InForkchoice(bRoot) {
+		return fmt.Errorf("could not process unknown block root %#x", bRoot)
+	}
+
 	// Before a node processes pending attestations queue, it verifies
 	// the attestations in the queue are still valid. Attestations will
 	// be deleted from the queue if invalid (i.e. getting stalled from falling too many slots behind).
 	s.validatePendingAtts(ctx, s.cfg.clock.CurrentSlot())
 
 	s.pendingAttsLock.RLock()
-	roots := make([][32]byte, 0, len(s.blkRootToPendingAtts))
-	for br := range s.blkRootToPendingAtts {
-		roots = append(roots, br)
-	}
+	attestations := s.blkRootToPendingAtts[bRoot]
 	s.pendingAttsLock.RUnlock()
 
-	var pendingRoots [][32]byte
+	if len(attestations) > 0 {
+		s.processAttestations(ctx, attestations)
+		log.WithFields(logrus.Fields{
+			"blockRoot":        hex.EncodeToString(bytesutil.Trunc(bRoot[:])),
+			"pendingAttsCount": len(attestations),
+		}).Debug("Verified and saved pending attestations to pool")
+	}
 	randGen := rand.NewGenerator()
-	for _, bRoot := range roots {
-		s.pendingAttsLock.RLock()
-		attestations := s.blkRootToPendingAtts[bRoot]
-		s.pendingAttsLock.RUnlock()
-		// has the pending attestation's missing block arrived and the node processed block yet?
-		if s.cfg.beaconDB.HasBlock(ctx, bRoot) && (s.cfg.beaconDB.HasState(ctx, bRoot) || s.cfg.beaconDB.HasStateSummary(ctx, bRoot)) && s.cfg.chain.InForkchoice(bRoot) {
-			s.processAttestations(ctx, attestations)
-			log.WithFields(logrus.Fields{
-				"blockRoot":        hex.EncodeToString(bytesutil.Trunc(bRoot[:])),
-				"pendingAttsCount": len(attestations),
-			}).Debug("Verified and saved pending attestations to pool")
-
-			// Delete the missing block root key from pending attestation queue so a node will not request for the block again.
-			s.pendingAttsLock.Lock()
-			delete(s.blkRootToPendingAtts, bRoot)
-			s.pendingAttsLock.Unlock()
-		} else {
-			s.pendingQueueLock.RLock()
-			seen := s.seenPendingBlocks[bRoot]
-			s.pendingQueueLock.RUnlock()
-			if !seen {
-				pendingRoots = append(pendingRoots, bRoot)
-			}
+	// Delete the missing block root key from pending attestation queue so a node will not request for the block again.
+	s.pendingAttsLock.Lock()
+	delete(s.blkRootToPendingAtts, bRoot)
+	pendingRoots := make([][32]byte, 0, len(s.blkRootToPendingAtts))
+	s.pendingQueueLock.RLock()
+	for r := range s.blkRootToPendingAtts {
+		if !s.seenPendingBlocks[r] {
+			pendingRoots = append(pendingRoots, r)
 		}
 	}
+	s.pendingQueueLock.RUnlock()
+	s.pendingAttsLock.Unlock()
+
+	//  Request the blocks for the pending attestations that could not be processed.
 	return s.sendBatchRootRequest(ctx, pendingRoots, randGen)
 }
 

beacon-chain/sync/pending_attestations_queue_test.go

@@ -53,16 +53,47 @@ func TestProcessPendingAtts_NoBlockRequestBlock(t *testing.T) {
 	p1.Peers().SetConnectionState(p2.PeerID(), peers.Connected)
 	p1.Peers().SetChainState(p2.PeerID(), &ethpb.StatusV2{})
 
-	chain := &mock.ChainService{Genesis: prysmTime.Now(), FinalizedCheckPoint: &ethpb.Checkpoint{}}
+	// Create and save block 'A' to DB
+	blockA := util.NewBeaconBlock()
+	util.SaveBlock(t, t.Context(), db, blockA)
+	rootA, err := blockA.Block.HashTreeRoot()
+	require.NoError(t, err)
+
+	// Save state for block 'A'
+	stateA, err := util.NewBeaconState()
+	require.NoError(t, err)
+	require.NoError(t, db.SaveState(t.Context(), stateA, rootA))
+
+	// Setup chain service with block 'A' in forkchoice
+	chain := &mock.ChainService{
+		Genesis:             prysmTime.Now(),
+		FinalizedCheckPoint: &ethpb.Checkpoint{},
+		// NotFinalized: false means InForkchoice returns true
+	}
+
 	r := &Service{
 		cfg:                  &config{p2p: p1, beaconDB: db, chain: chain, clock: startup.NewClock(chain.Genesis, chain.ValidatorsRoot)},
 		blkRootToPendingAtts: make(map[[32]byte][]any),
+		seenPendingBlocks:    make(map[[32]byte]bool),
 		chainStarted:         abool.New(),
 	}
 
-	a := &ethpb.Attestation{Data: &ethpb.AttestationData{Target: &ethpb.Checkpoint{Root: make([]byte, 32)}}}
-	r.blkRootToPendingAtts[[32]byte{'A'}] = []any{a}
-	require.NoError(t, r.processPendingAtts(t.Context()))
+	// Add pending attestations for OTHER block roots (not block A)
+	// These are blocks we don't have yet, so they should be requested
+	attB := &ethpb.Attestation{Data: &ethpb.AttestationData{
+		BeaconBlockRoot: bytesutil.PadTo([]byte{'B'}, 32),
+		Target:          &ethpb.Checkpoint{Root: make([]byte, 32)},
+	}}
+	attC := &ethpb.Attestation{Data: &ethpb.AttestationData{
+		BeaconBlockRoot: bytesutil.PadTo([]byte{'C'}, 32),
+		Target:          &ethpb.Checkpoint{Root: make([]byte, 32)},
+	}}
+	r.blkRootToPendingAtts[[32]byte{'B'}] = []any{attB}
+	r.blkRootToPendingAtts[[32]byte{'C'}] = []any{attC}
+
+	// Process block A (which exists and has no pending attestations)
+	// This should skip processing attestations for A and request blocks B and C
+	require.NoError(t, r.processPendingAttsForBlock(t.Context(), rootA))
 	require.LogsContain(t, hook, "Requesting block by root")
 }
 
@@ -141,7 +172,7 @@ func TestProcessPendingAtts_HasBlockSaveUnaggregatedAtt(t *testing.T) {
 	require.NoError(t, r.cfg.beaconDB.SaveState(t.Context(), s, root))
 
 	r.blkRootToPendingAtts[root] = []any{att}
-	require.NoError(t, r.processPendingAtts(t.Context()))
+	require.NoError(t, r.processPendingAttsForBlock(t.Context(), root))
 
 	var wg sync.WaitGroup
 	wg.Add(1)
@@ -235,7 +266,7 @@ func TestProcessPendingAtts_HasBlockSaveUnaggregatedAttElectra(t *testing.T) {
 	require.NoError(t, r.cfg.beaconDB.SaveState(t.Context(), s, root))
 
 	r.blkRootToPendingAtts[root] = []any{att}
-	require.NoError(t, r.processPendingAtts(t.Context()))
+	require.NoError(t, r.processPendingAttsForBlock(t.Context(), root))
 	var wg sync.WaitGroup
 	wg.Add(1)
 	go func() {
@@ -360,7 +391,7 @@ func TestProcessPendingAtts_HasBlockSaveUnAggregatedAttElectra_VerifyAlreadySeen
 	r.blkRootToPendingAtts[root] = []any{
 		att,
 	}
-	require.NoError(t, r.processPendingAtts(t.Context()))
+	require.NoError(t, r.processPendingAttsForBlock(t.Context(), root))
 
 	// Verify that the event feed receives the expected attestation.
 	var wg sync.WaitGroup
@@ -471,7 +502,7 @@ func TestProcessPendingAtts_NoBroadcastWithBadSignature(t *testing.T) {
 	}
 
 	s.blkRootToPendingAtts[r32] = []any{&ethpb.SignedAggregateAttestationAndProof{Message: a, Signature: make([]byte, fieldparams.BLSSignatureLength)}}
-	require.NoError(t, s.processPendingAtts(t.Context()))
+	require.NoError(t, s.processPendingAttsForBlock(t.Context(), r32))
 
 	assert.Equal(t, false, p2p.BroadcastCalled.Load(), "Broadcasted bad aggregate")
 
@@ -510,7 +541,7 @@ func TestProcessPendingAtts_NoBroadcastWithBadSignature(t *testing.T) {
 	require.NoError(t, err)
 
 	s.blkRootToPendingAtts[r32] = []any{&ethpb.SignedAggregateAttestationAndProof{Message: aggregateAndProof, Signature: aggreSig}}
-	require.NoError(t, s.processPendingAtts(t.Context()))
+	require.NoError(t, s.processPendingAttsForBlock(t.Context(), r32))
 
 	assert.Equal(t, true, p2p.BroadcastCalled.Load(), "The good aggregate was not broadcasted")
 
@@ -601,7 +632,7 @@ func TestProcessPendingAtts_HasBlockSaveAggregatedAtt(t *testing.T) {
 	require.NoError(t, r.cfg.beaconDB.SaveState(t.Context(), s, root))
 
 	r.blkRootToPendingAtts[root] = []any{&ethpb.SignedAggregateAttestationAndProof{Message: aggregateAndProof, Signature: aggreSig}}
-	require.NoError(t, r.processPendingAtts(t.Context()))
+	require.NoError(t, r.processPendingAttsForBlock(t.Context(), root))
 
 	assert.Equal(t, 1, len(r.cfg.attPool.AggregatedAttestations()), "Did not save aggregated att")
 	assert.DeepEqual(t, att, r.cfg.attPool.AggregatedAttestations()[0], "Incorrect saved att")
@@ -696,7 +727,7 @@ func TestProcessPendingAtts_HasBlockSaveAggregatedAttElectra(t *testing.T) {
 	require.NoError(t, r.cfg.beaconDB.SaveState(t.Context(), s, root))
 
 	r.blkRootToPendingAtts[root] = []any{&ethpb.SignedAggregateAttestationAndProofElectra{Message: aggregateAndProof, Signature: aggreSig}}
-	require.NoError(t, r.processPendingAtts(t.Context()))
+	require.NoError(t, r.processPendingAttsForBlock(t.Context(), root))
 
 	assert.Equal(t, 1, len(r.cfg.attPool.AggregatedAttestations()), "Did not save aggregated att")
 	assert.DeepEqual(t, att, r.cfg.attPool.AggregatedAttestations()[0], "Incorrect saved att")
@@ -780,8 +811,8 @@ func TestProcessPendingAtts_BlockNotInForkChoice(t *testing.T) {
 	// Add pending attestation
 	r.blkRootToPendingAtts[root] = []any{&ethpb.SignedAggregateAttestationAndProof{Message: aggregateAndProof}}
 
-	// Process pending attestations - should not process because block is not in fork choice
-	require.NoError(t, r.processPendingAtts(t.Context()))
+	// Process pending attestations - should return error because block is not in fork choice
+	require.ErrorContains(t, "could not process unknown block root", r.processPendingAttsForBlock(t.Context(), root))
 
 	// Verify attestations were not processed (should still be pending)
 	assert.Equal(t, 1, len(r.blkRootToPendingAtts[root]), "Attestations should still be pending")

beacon-chain/sync/rpc_beacon_blocks_by_root.go

@@ -97,7 +97,7 @@ func (s *Service) requestAndSaveMissingDataColumnSidecars(blks []blocks.ROBlock)
 
 	custodyGroupCount, err := s.cfg.p2p.CustodyGroupCount()
 	if err != nil {
-		return errors.Wrap(err, "fetch custody group count from peer")
+		return errors.Wrap(err, "custody group count")
 	}
 
 	samplingSize := max(custodyGroupCount, samplesPerSlot)

beacon-chain/sync/service.go

@@ -274,7 +274,6 @@ func (s *Service) Start() {
 	s.cfg.p2p.AddPingMethod(s.sendPingRequest)
 
 	s.processPendingBlocksQueue()
-	s.runPendingAttsQueue()
 	s.maintainPeerStatuses()
 
 	if params.FuluEnabled() {

beacon-chain/sync/subscriber.go

@@ -44,6 +44,11 @@ type wrappedVal func(context.Context, peer.ID, *pubsub.Message) (pubsub.Validati
 // subHandler represents handler for a given subscription.
 type subHandler func(context.Context, proto.Message) error
 
+// noopHandler is used for subscriptions that do not require anything to be done.
+var noopHandler subHandler = func(ctx context.Context, msg proto.Message) error {
+	return nil
+}
+
 // subscribeParameters holds the parameters that are needed to construct a set of subscriptions topics for a given
 // set of gossipsub subnets.
 type subscribeParameters struct {
@@ -251,7 +256,7 @@ func (s *Service) registerSubscribers(epoch primitives.Epoch, digest [4]byte) {
 				s.subscribe(
 					p2p.LightClientOptimisticUpdateTopicFormat,
 					s.validateLightClientOptimisticUpdate,
-					s.lightClientOptimisticUpdateSubscriber,
+					noopHandler,
 					digest,
 				)
 			})
@@ -259,7 +264,7 @@ func (s *Service) registerSubscribers(epoch primitives.Epoch, digest [4]byte) {
 				s.subscribe(
 					p2p.LightClientFinalityUpdateTopicFormat,
 					s.validateLightClientFinalityUpdate,
-					s.lightClientFinalityUpdateSubscriber,
+					noopHandler,
 					digest,
 				)
 			})

beacon-chain/sync/subscriber_beacon_blocks.go

@@ -68,7 +68,10 @@ func (s *Service) beaconBlockSubscriber(ctx context.Context, msg proto.Message)
 		}
 		return err
 	}
-	return err
+	if err := s.processPendingAttsForBlock(ctx, root); err != nil {
+		return errors.Wrap(err, "process pending atts for block")
+	}
+	return nil
 }
 
 // processSidecarsFromExecutionFromBlock retrieves (if available) sidecars data from the execution client,

beacon-chain/sync/subscriber_light_client.go

@@ -1,66 +0,0 @@
-package sync
-
-import (
-	"context"
-	"fmt"
-
-	"github.com/OffchainLabs/prysm/v6/beacon-chain/core/feed"
-	statefeed "github.com/OffchainLabs/prysm/v6/beacon-chain/core/feed/state"
-	lightclientTypes "github.com/OffchainLabs/prysm/v6/consensus-types/light-client"
-	"github.com/sirupsen/logrus"
-	"google.golang.org/protobuf/proto"
-)
-
-func (s *Service) lightClientOptimisticUpdateSubscriber(_ context.Context, msg proto.Message) error {
-	update, err := lightclientTypes.NewWrappedOptimisticUpdate(msg)
-	if err != nil {
-		return err
-	}
-
-	attestedHeaderRoot, err := update.AttestedHeader().Beacon().HashTreeRoot()
-	if err != nil {
-		return err
-	}
-
-	log.WithFields(logrus.Fields{
-		"attestedSlot":       fmt.Sprintf("%d", update.AttestedHeader().Beacon().Slot),
-		"signatureSlot":      fmt.Sprintf("%d", update.SignatureSlot()),
-		"attestedHeaderRoot": fmt.Sprintf("%x", attestedHeaderRoot),
-	}).Debug("Saving newly received light client optimistic update.")
-
-	s.lcStore.SetLastOptimisticUpdate(update, false)
-
-	s.cfg.stateNotifier.StateFeed().Send(&feed.Event{
-		Type: statefeed.LightClientOptimisticUpdate,
-		Data: update,
-	})
-
-	return nil
-}
-
-func (s *Service) lightClientFinalityUpdateSubscriber(_ context.Context, msg proto.Message) error {
-	update, err := lightclientTypes.NewWrappedFinalityUpdate(msg)
-	if err != nil {
-		return err
-	}
-
-	attestedHeaderRoot, err := update.AttestedHeader().Beacon().HashTreeRoot()
-	if err != nil {
-		return err
-	}
-
-	log.WithFields(logrus.Fields{
-		"attestedSlot":       fmt.Sprintf("%d", update.AttestedHeader().Beacon().Slot),
-		"signatureSlot":      fmt.Sprintf("%d", update.SignatureSlot()),
-		"attestedHeaderRoot": fmt.Sprintf("%x", attestedHeaderRoot),
-	}).Debug("Saving newly received light client finality update.")
-
-	s.lcStore.SetLastFinalityUpdate(update, false)
-
-	s.cfg.stateNotifier.StateFeed().Send(&feed.Event{
-		Type: statefeed.LightClientFinalityUpdate,
-		Data: update,
-	})
-
-	return nil
-}

beacon-chain/sync/subscriber_test.go

@@ -9,12 +9,10 @@ import (
 	"time"
 
 	"github.com/OffchainLabs/prysm/v6/async/abool"
-	"github.com/OffchainLabs/prysm/v6/async/event"
 	mockChain "github.com/OffchainLabs/prysm/v6/beacon-chain/blockchain/testing"
 	"github.com/OffchainLabs/prysm/v6/beacon-chain/cache"
 	"github.com/OffchainLabs/prysm/v6/beacon-chain/core/signing"
 	db "github.com/OffchainLabs/prysm/v6/beacon-chain/db/testing"
-	lightClient "github.com/OffchainLabs/prysm/v6/beacon-chain/light-client"
 	"github.com/OffchainLabs/prysm/v6/beacon-chain/operations/slashings"
 	"github.com/OffchainLabs/prysm/v6/beacon-chain/p2p"
 	"github.com/OffchainLabs/prysm/v6/beacon-chain/p2p/encoder"
@@ -28,7 +26,6 @@ import (
 	"github.com/OffchainLabs/prysm/v6/consensus-types/primitives"
 	"github.com/OffchainLabs/prysm/v6/encoding/bytesutil"
 	pb "github.com/OffchainLabs/prysm/v6/proto/prysm/v1alpha1"
-	"github.com/OffchainLabs/prysm/v6/runtime/version"
 	"github.com/OffchainLabs/prysm/v6/testing/assert"
 	"github.com/OffchainLabs/prysm/v6/testing/require"
 	"github.com/OffchainLabs/prysm/v6/testing/util"
@@ -676,143 +673,3 @@ func createPeer(t *testing.T, topics ...string) *p2ptest.TestP2P {
 	}
 	return p
 }
-
-func TestSubscribe_ReceivesLCOptimisticUpdate(t *testing.T) {
-	origNC := params.BeaconConfig()
-	// restore network config after test completes
-	defer func() {
-		params.OverrideBeaconConfig(origNC)
-	}()
-
-	params.SetupTestConfigCleanup(t)
-	p2pService := p2ptest.NewTestP2P(t)
-	ctx := t.Context()
-	cfg := params.BeaconConfig().Copy()
-	cfg.AltairForkEpoch = 1
-	cfg.ForkVersionSchedule[[4]byte{1, 0, 0, 0}] = 1
-	params.OverrideBeaconConfig(cfg)
-
-	secondsPerSlot := int(params.BeaconConfig().SecondsPerSlot)
-	slotIntervals := int(params.BeaconConfig().IntervalsPerSlot)
-	slotsPerEpoch := int(params.BeaconConfig().SlotsPerEpoch)
-
-	genesisDrift := slotsPerEpoch*secondsPerSlot + 2*secondsPerSlot + secondsPerSlot/slotIntervals
-	chainService := &mockChain.ChainService{
-		ValidatorsRoot: [32]byte{'A'},
-		Genesis:        time.Unix(time.Now().Unix()-int64(genesisDrift), 0),
-	}
-	d := db.SetupDB(t)
-	lcStore := lightClient.NewLightClientStore(&p2ptest.FakeP2P{}, new(event.Feed), d)
-
-	r := Service{
-		ctx: ctx,
-		cfg: &config{
-			p2p:           p2pService,
-			initialSync:   &mockSync.Sync{IsSyncing: false},
-			chain:         chainService,
-			beaconDB:      d,
-			clock:         startup.NewClock(chainService.Genesis, chainService.ValidatorsRoot),
-			stateNotifier: &mockChain.MockStateNotifier{},
-		},
-		chainStarted: abool.New(),
-		lcStore:      lcStore,
-		subHandler:   newSubTopicHandler(),
-	}
-	markInitSyncComplete(t, &r)
-	topic := p2p.LightClientOptimisticUpdateTopicFormat
-	var wg sync.WaitGroup
-	wg.Add(1)
-
-	var err error
-	p2pService.Digest, err = r.currentForkDigest()
-	require.NoError(t, err)
-	r.subscribe(topic, r.validateLightClientOptimisticUpdate, func(ctx context.Context, msg proto.Message) error {
-		require.NoError(t, r.lightClientOptimisticUpdateSubscriber(ctx, msg))
-		wg.Done()
-		return nil
-	}, p2pService.Digest)
-
-	r.markForChainStart()
-
-	l := util.NewTestLightClient(t, version.Altair, util.WithSupermajority(0))
-	update, err := lightClient.NewLightClientOptimisticUpdateFromBeaconState(l.Ctx, l.State, l.Block, l.AttestedState, l.AttestedBlock)
-	require.NoError(t, err, "Error generating light client optimistic update")
-
-	p2pService.ReceivePubSub(topic, update.Proto())
-
-	if util.WaitTimeout(&wg, time.Second) {
-		t.Fatal("Did not receive PubSub in 1 second")
-	}
-	u := r.lcStore.LastOptimisticUpdate()
-	assert.DeepEqual(t, update.Proto(), u.Proto())
-}
-
-func TestSubscribe_ReceivesLCFinalityUpdate(t *testing.T) {
-	origNC := params.BeaconConfig()
-	// restore network config after test completes
-	defer func() {
-		params.OverrideBeaconConfig(origNC)
-	}()
-
-	params.SetupTestConfigCleanup(t)
-	p2pService := p2ptest.NewTestP2P(t)
-	ctx := t.Context()
-	cfg := params.BeaconConfig().Copy()
-	cfg.AltairForkEpoch = 1
-	cfg.ForkVersionSchedule[[4]byte{1, 0, 0, 0}] = 1
-	params.OverrideBeaconConfig(cfg)
-
-	secondsPerSlot := int(params.BeaconConfig().SecondsPerSlot)
-	slotIntervals := int(params.BeaconConfig().IntervalsPerSlot)
-	slotsPerEpoch := int(params.BeaconConfig().SlotsPerEpoch)
-
-	genesisDrift := slotsPerEpoch*secondsPerSlot + 2*secondsPerSlot + secondsPerSlot/slotIntervals
-	chainService := &mockChain.ChainService{
-		ValidatorsRoot: [32]byte{'A'},
-		Genesis:        time.Unix(time.Now().Unix()-int64(genesisDrift), 0),
-	}
-	d := db.SetupDB(t)
-	lcStore := lightClient.NewLightClientStore(&p2ptest.FakeP2P{}, new(event.Feed), d)
-
-	r := Service{
-		ctx: ctx,
-		cfg: &config{
-			p2p:           p2pService,
-			initialSync:   &mockSync.Sync{IsSyncing: false},
-			chain:         chainService,
-			beaconDB:      d,
-			clock:         startup.NewClock(chainService.Genesis, chainService.ValidatorsRoot),
-			stateNotifier: &mockChain.MockStateNotifier{},
-		},
-		chainStarted: abool.New(),
-		lcStore:      lcStore,
-		subHandler:   newSubTopicHandler(),
-	}
-	markInitSyncComplete(t, &r)
-	topic := p2p.LightClientFinalityUpdateTopicFormat
-	var wg sync.WaitGroup
-	wg.Add(1)
-
-	var err error
-	p2pService.Digest, err = r.currentForkDigest()
-	require.NoError(t, err)
-	r.subscribe(topic, r.validateLightClientFinalityUpdate, func(ctx context.Context, msg proto.Message) error {
-		require.NoError(t, r.lightClientFinalityUpdateSubscriber(ctx, msg))
-		wg.Done()
-		return nil
-	}, p2pService.Digest)
-
-	r.markForChainStart()
-
-	l := util.NewTestLightClient(t, version.Altair, util.WithSupermajority(0))
-	update, err := lightClient.NewLightClientFinalityUpdateFromBeaconState(l.Ctx, l.State, l.Block, l.AttestedState, l.AttestedBlock, l.FinalizedBlock)
-	require.NoError(t, err, "Error generating light client finality update")
-
-	p2pService.ReceivePubSub(topic, update.Proto())
-
-	if util.WaitTimeout(&wg, time.Second) {
-		t.Fatal("Did not receive PubSub in 1 second")
-	}
-	u := r.lcStore.LastFinalityUpdate()
-	assert.DeepEqual(t, update.Proto(), u.Proto())
-}

beacon-chain/sync/validate_bls_to_execution_change_test.go

@@ -429,12 +429,12 @@ func TestService_ValidateBlsToExecutionChange(t *testing.T) {
 			svc := NewService(ctx, append(opts, tt.svcopts...)...)
 			markInitSyncComplete(t, svc)
 			svc, tt.args.topic = tt.setupSvc(svc, tt.args.msg, tt.args.topic)
-			go svc.Start()
 			if tt.clock == nil {
 				tt.clock = startup.NewClock(time.Now(), [32]byte{})
 			}
 			require.NoError(t, cw.SetClock(tt.clock))
 			svc.verifierWaiter = verification.NewInitializerWaiter(cw, chainService.ForkChoiceStore, svc.cfg.stateGen)
+			go svc.Start()
 
 			marshalledObj, err := tt.args.msg.MarshalSSZ()
 			assert.NoError(t, err)

beacon-chain/sync/validate_light_client.go

@@ -5,7 +5,6 @@ import (
 	"fmt"
 	"time"
 
-	lightclient "github.com/OffchainLabs/prysm/v6/beacon-chain/light-client"
 	"github.com/OffchainLabs/prysm/v6/config/params"
 	"github.com/OffchainLabs/prysm/v6/consensus-types/interfaces"
 	"github.com/OffchainLabs/prysm/v6/monitoring/tracing"
@@ -14,6 +13,7 @@ import (
 	pubsub "github.com/libp2p/go-libp2p-pubsub"
 	"github.com/libp2p/go-libp2p/core/peer"
 	"github.com/sirupsen/logrus"
+	"google.golang.org/protobuf/proto"
 )
 
 func (s *Service) validateLightClientOptimisticUpdate(ctx context.Context, pid peer.ID, msg *pubsub.Message) (pubsub.ValidationResult, error) {
@@ -31,6 +31,12 @@ func (s *Service) validateLightClientOptimisticUpdate(ctx context.Context, pid p
 	_, span := trace.StartSpan(ctx, "sync.validateLightClientOptimisticUpdate")
 	defer span.End()
 
+	currentUpdate := s.lcStore.LastOptimisticUpdate()
+	if currentUpdate == nil {
+		log.Debug("No existing optimistic update to compare against. Ignoring.")
+		return pubsub.ValidationIgnore, nil
+	}
+
 	m, err := s.decodePubsubMessage(msg)
 	if err != nil {
 		tracing.AnnotateError(span, err)
@@ -64,12 +70,12 @@ func (s *Service) validateLightClientOptimisticUpdate(ctx context.Context, pid p
 		return pubsub.ValidationIgnore, nil
 	}
 
-	if !lightclient.IsBetterOptimisticUpdate(newUpdate, s.lcStore.LastOptimisticUpdate()) {
+	if !proto.Equal(newUpdate.Proto(), currentUpdate.Proto()) {
 		log.WithFields(logrus.Fields{
 			"attestedSlot":       fmt.Sprintf("%d", newUpdate.AttestedHeader().Beacon().Slot),
 			"signatureSlot":      fmt.Sprintf("%d", newUpdate.SignatureSlot()),
 			"attestedHeaderRoot": fmt.Sprintf("%x", attestedHeaderRoot),
-		}).Debug("Newly received light client optimistic update ignored. current update is better.")
+		}).Debug("Received light client optimistic update is different from the local one. Ignoring.")
 		return pubsub.ValidationIgnore, nil
 	}
 
@@ -98,6 +104,12 @@ func (s *Service) validateLightClientFinalityUpdate(ctx context.Context, pid pee
 	_, span := trace.StartSpan(ctx, "sync.validateLightClientFinalityUpdate")
 	defer span.End()
 
+	currentUpdate := s.lcStore.LastFinalityUpdate()
+	if currentUpdate == nil {
+		log.Debug("No existing finality update to compare against. Ignoring.")
+		return pubsub.ValidationIgnore, nil
+	}
+
 	m, err := s.decodePubsubMessage(msg)
 	if err != nil {
 		tracing.AnnotateError(span, err)
@@ -131,12 +143,12 @@ func (s *Service) validateLightClientFinalityUpdate(ctx context.Context, pid pee
 		return pubsub.ValidationIgnore, nil
 	}
 
-	if !lightclient.IsFinalityUpdateValidForBroadcast(newUpdate, s.lcStore.LastFinalityUpdate()) {
+	if !proto.Equal(newUpdate.Proto(), currentUpdate.Proto()) {
 		log.WithFields(logrus.Fields{
 			"attestedSlot":       fmt.Sprintf("%d", newUpdate.AttestedHeader().Beacon().Slot),
 			"signatureSlot":      fmt.Sprintf("%d", newUpdate.SignatureSlot()),
 			"attestedHeaderRoot": fmt.Sprintf("%x", attestedHeaderRoot),
-		}).Debug("Newly received light client finality update ignored. current update is better.")
+		}).Debug("Received light client finality update is different from the local one. ignoring.")
 		return pubsub.ValidationIgnore, nil
 	}
 

beacon-chain/sync/validate_light_client_test.go

@@ -26,9 +26,13 @@ func TestValidateLightClientOptimisticUpdate_NilMessageOrTopic(t *testing.T) {
 	params.SetupTestConfigCleanup(t)
 	ctx := t.Context()
 	p := p2ptest.NewTestP2P(t)
-	s := &Service{cfg: &config{p2p: p, initialSync: &mockSync.Sync{}}}
+	lcStore := lightClient.NewLightClientStore(&p2ptest.FakeP2P{}, new(event.Feed), testDB.SetupDB(t))
+	s := &Service{cfg: &config{p2p: p, initialSync: &mockSync.Sync{}}, lcStore: lcStore}
+	mockUpdate, err := util.MockOptimisticUpdate()
+	require.NoError(t, err)
+	s.lcStore.SetLastOptimisticUpdate(mockUpdate, false)
 
-	_, err := s.validateLightClientOptimisticUpdate(ctx, "", nil)
+	_, err = s.validateLightClientOptimisticUpdate(ctx, "", nil)
 	require.ErrorIs(t, err, errNilPubsubMessage)
 
 	_, err = s.validateLightClientOptimisticUpdate(ctx, "", &pubsub.Message{Message: &pb.Message{}})
@@ -72,27 +76,27 @@ func TestValidateLightClientOptimisticUpdate(t *testing.T) {
 			name:             "no previous update",
 			oldUpdateOptions: nil,
 			newUpdateOptions: []util.LightClientOption{},
-			expectedResult:   pubsub.ValidationAccept,
+			expectedResult:   pubsub.ValidationIgnore,
 		},
 		{
 			name:             "not enough time passed",
 			genesisDrift:     -secondsPerSlot / slotIntervals,
-			oldUpdateOptions: nil,
-			newUpdateOptions: []util.LightClientOption{},
-			expectedResult:   pubsub.ValidationIgnore,
-		},
-		{
-			name:             "new update has no age advantage",
 			oldUpdateOptions: []util.LightClientOption{},
 			newUpdateOptions: []util.LightClientOption{},
 			expectedResult:   pubsub.ValidationIgnore,
 		},
 		{
-			name:             "new update is better - younger",
+			name:             "new update is the same",
+			oldUpdateOptions: []util.LightClientOption{},
+			newUpdateOptions: []util.LightClientOption{},
+			expectedResult:   pubsub.ValidationAccept,
+		},
+		{
+			name:             "new update is different",
 			genesisDrift:     secondsPerSlot,
 			oldUpdateOptions: []util.LightClientOption{},
 			newUpdateOptions: []util.LightClientOption{util.WithIncreasedAttestedSlot(1)},
-			expectedResult:   pubsub.ValidationAccept,
+			expectedResult:   pubsub.ValidationIgnore,
 		},
 	}
 
@@ -149,9 +153,13 @@ func TestValidateLightClientFinalityUpdate_NilMessageOrTopic(t *testing.T) {
 	params.SetupTestConfigCleanup(t)
 	ctx := t.Context()
 	p := p2ptest.NewTestP2P(t)
-	s := &Service{cfg: &config{p2p: p, initialSync: &mockSync.Sync{}}}
+	lcStore := lightClient.NewLightClientStore(&p2ptest.FakeP2P{}, new(event.Feed), testDB.SetupDB(t))
+	s := &Service{cfg: &config{p2p: p, initialSync: &mockSync.Sync{}}, lcStore: lcStore}
+	mockUpdate, err := util.MockFinalityUpdate()
+	require.NoError(t, err)
+	s.lcStore.SetLastFinalityUpdate(mockUpdate, false)
 
-	_, err := s.validateLightClientFinalityUpdate(ctx, "", nil)
+	_, err = s.validateLightClientFinalityUpdate(ctx, "", nil)
 	require.ErrorIs(t, err, errNilPubsubMessage)
 
 	_, err = s.validateLightClientFinalityUpdate(ctx, "", &pubsub.Message{Message: &pb.Message{}})
@@ -195,44 +203,26 @@ func TestValidateLightClientFinalityUpdate(t *testing.T) {
 			name:             "no previous update",
 			oldUpdateOptions: nil,
 			newUpdateOptions: []util.LightClientOption{},
-			expectedResult:   pubsub.ValidationAccept,
+			expectedResult:   pubsub.ValidationIgnore,
 		},
 		{
 			name:             "not enough time passed",
 			genesisDrift:     -secondsPerSlot / slotIntervals,
-			oldUpdateOptions: nil,
-			newUpdateOptions: []util.LightClientOption{},
-			expectedResult:   pubsub.ValidationIgnore,
-		},
-		{
-			name:             "new update has no advantage",
 			oldUpdateOptions: []util.LightClientOption{},
 			newUpdateOptions: []util.LightClientOption{},
 			expectedResult:   pubsub.ValidationIgnore,
 		},
 		{
-			name:             "new update is better - age",
+			name:             "new update is the same",
+			oldUpdateOptions: []util.LightClientOption{},
+			newUpdateOptions: []util.LightClientOption{},
+			expectedResult:   pubsub.ValidationAccept,
+		},
+		{
+			name:             "new update is different",
 			genesisDrift:     secondsPerSlot,
 			oldUpdateOptions: []util.LightClientOption{},
 			newUpdateOptions: []util.LightClientOption{util.WithIncreasedFinalizedSlot(1)},
-			expectedResult:   pubsub.ValidationAccept,
-		},
-		{
-			name:             "new update is better - supermajority",
-			oldUpdateOptions: []util.LightClientOption{},
-			newUpdateOptions: []util.LightClientOption{util.WithSupermajority(0)},
-			expectedResult:   pubsub.ValidationAccept,
-		},
-		{
-			name:             "old update is better - supermajority",
-			oldUpdateOptions: []util.LightClientOption{util.WithSupermajority(0)},
-			newUpdateOptions: []util.LightClientOption{},
-			expectedResult:   pubsub.ValidationIgnore,
-		},
-		{
-			name:             "old update is better - age",
-			oldUpdateOptions: []util.LightClientOption{util.WithIncreasedAttestedSlot(1)},
-			newUpdateOptions: []util.LightClientOption{},
 			expectedResult:   pubsub.ValidationIgnore,
 		},
 	}

beacon-chain/sync/validate_sync_committee_message_test.go

@@ -410,9 +410,9 @@ func TestService_ValidateSyncCommitteeMessage(t *testing.T) {
 			var clock *startup.Clock
 			svc, tt.args.topic, clock = tt.setupSvc(svc, tt.args.msg, tt.args.topic)
 			markInitSyncComplete(t, svc)
-			go svc.Start()
 			require.NoError(t, cw.SetClock(clock))
 			svc.verifierWaiter = verification.NewInitializerWaiter(cw, chainService.ForkChoiceStore, svc.cfg.stateGen)
+			go svc.Start()
 
 			marshalledObj, err := tt.args.msg.MarshalSSZ()
 			assert.NoError(t, err)

beacon-chain/verification/data_column.go

@@ -2,6 +2,7 @@ package verification
 
 import (
 	"context"
+	"crypto/sha256"
 	"fmt"
 	"strings"
 	"time"
@@ -524,24 +525,39 @@ func columnErrBuilder(baseErr error) error {
 	return errors.Wrap(baseErr, errColumnsInvalid.Error())
 }
 
-func inclusionProofKey(c blocks.RODataColumn) ([160]byte, error) {
-	var key [160]byte
-	if len(c.KzgCommitmentsInclusionProof) != 4 {
+// incluseionProofKey computes a unique key based on the KZG commitments,
+// the KZG commitments inclusion proof, and the signed block header root.
+func inclusionProofKey(c blocks.RODataColumn) ([32]byte, error) {
+	const (
+		commsIncProofLen       = 4
+		commsIncProofByteCount = commsIncProofLen * 32
+	)
+
+	if len(c.KzgCommitmentsInclusionProof) != commsIncProofLen {
 		// This should be already enforced by ssz unmarshaling; still check so we don't panic on array bounds.
-		return key, columnErrBuilder(ErrSidecarInclusionProofInvalid)
+		return [32]byte{}, columnErrBuilder(ErrSidecarInclusionProofInvalid)
 	}
 
+	commsByteCount := len(c.KzgCommitments) * fieldparams.KzgCommitmentSize
+	unhashedKey := make([]byte, 0, commsIncProofByteCount+fieldparams.RootLength+commsByteCount)
+
+	// Include the commitments inclusion proof in the key.
+	for _, proof := range c.KzgCommitmentsInclusionProof {
+		unhashedKey = append(unhashedKey, proof...)
+	}
+
+	// Include the block root in the key.
 	root, err := c.SignedBlockHeader.HashTreeRoot()
 	if err != nil {
-		return [160]byte{}, columnErrBuilder(errors.Wrap(err, "hash tree root"))
+		return [32]byte{}, columnErrBuilder(errors.Wrap(err, "hash tree root"))
 	}
 
-	for i := range c.KzgCommitmentsInclusionProof {
-		if copy(key[32*i:32*i+32], c.KzgCommitmentsInclusionProof[i]) != 32 {
-			return key, columnErrBuilder(ErrSidecarInclusionProofInvalid)
-		}
+	unhashedKey = append(unhashedKey, root[:]...)
+
+	// Include the commitments in the key.
+	for _, commitment := range c.KzgCommitments {
+		unhashedKey = append(unhashedKey, commitment...)
 	}
 
-	copy(key[128:], root[:])
-	return key, nil
+	return sha256.Sum256(unhashedKey), nil
 }

changelog/bastin_lc-p2p-validation.md

@@ -0,0 +1,4 @@
+### Changed
+
+- Compare received LC messages over gossipsub with locally computed ones before forwarding. Also no longer save updates
+  from gossipsub, just validate and forward.

changelog/james-prysm_improve-duties-v2.md

@@ -0,0 +1,3 @@
+### Fixed
+
+- adding in improvements to getduties v2, replaces helpers.PrecomputeCommittees() ( exepensive ) with CommitteeAssignments

changelog/manu-fix-log.md

@@ -0,0 +1,3 @@
+### Ignored
+- `requestAndSaveMissingDataColumnSidecars`: Fix log
+

changelog/manu-inclusion-cache-key.md

@@ -0,0 +1,3 @@
+### Fixed
+- `inclusionProofKey`: Include the commitments in the key.
+

changelog/manu-peerdas-c-kzg-update.md

@@ -0,0 +1,2 @@
+### Changed 
+- `c-kzg-4844`: Update from `v2.1.1` to `v2.1.5`

changelog/potuz_avoid_exit_info.md

@@ -0,0 +1,3 @@
+### Fixed
+
+- Avoid unnecessary calls to `ExitInformation()`.

changelog/potuz_fix_races_in_tests.md

@@ -0,0 +1,3 @@
+### Ignored
+
+- Fix races in tests that cause nil panics. 

changelog/potuz_process_pending_atts.md

@@ -0,0 +1,3 @@
+### Changed
+
+- Process pending attestations as soon as the block arrives. 

deps.bzl

@@ -776,8 +776,8 @@ def prysm_deps():
         importpath = "github.com/ethereum/c-kzg-4844/v2",
         patch_args = ["-p1"],
         patches = ["//third_party:com_github_ethereum_c_kzg_4844.patch"],
-        sum = "h1:KhzBVjmURsfr1+S3k/VE35T02+AW2qU9t9gr4R6YpSo=",
-        version = "v2.1.1",
+        sum = "h1:aVtoLK5xwJ6c5RiqO8g8ptJ5KU+2Hdquf6G3aXiHh5s=",
+        version = "v2.1.5",
     )
     go_repository(
         name = "com_github_ethereum_go_ethereum",
@@ -3318,8 +3318,8 @@ def prysm_deps():
         importpath = "github.com/supranational/blst",
         patch_args = ["-p1"],
         patches = ["//third_party:com_github_supranational_blst.patch"],
-        sum = "h1:xNMoHRJOTwMn63ip6qoWJ2Ymgvj7E2b9jY2FAwY+qRo=",
-        version = "v0.3.14",
+        sum = "h1:nbdqkIGOGfUAD54q1s2YBcBz/WcsxCO9HUQ4aGV5hUw=",
+        version = "v0.3.16-0.20250831170142-f48500c1fdbe",
     )
     go_repository(
         name = "com_github_syndtr_goleveldb",

go.mod

@@ -14,7 +14,7 @@ require (
 	github.com/dgraph-io/ristretto/v2 v2.2.0
 	github.com/dustin/go-humanize v1.0.1
 	github.com/emicklei/dot v0.11.0
-	github.com/ethereum/c-kzg-4844/v2 v2.1.1
+	github.com/ethereum/c-kzg-4844/v2 v2.1.5
 	github.com/ethereum/go-ethereum v1.15.9
 	github.com/fsnotify/fsnotify v1.6.0
 	github.com/ghodss/yaml v1.0.0
@@ -70,7 +70,7 @@ require (
 	github.com/spf13/afero v1.10.0
 	github.com/status-im/keycard-go v0.2.0
 	github.com/stretchr/testify v1.10.0
-	github.com/supranational/blst v0.3.14
+	github.com/supranational/blst v0.3.16-0.20250831170142-f48500c1fdbe
 	github.com/thomaso-mirodin/intmath v0.0.0-20160323211736-5dc6d854e46e
 	github.com/trailofbits/go-mutexasserts v0.0.0-20250212181730-4c2b8e9e784b
 	github.com/tyler-smith/go-bip39 v1.1.0

go.sum

@@ -234,8 +234,8 @@ github.com/envoyproxy/go-control-plane v0.9.9-0.20201210154907-fd9021fe5dad/go.m
 github.com/envoyproxy/protoc-gen-validate v0.1.0/go.mod h1:iSmxcyjqTsJpI2R4NaDN7+kN2VEUnK/pcBlmesArF7c=
 github.com/ethereum/c-kzg-4844 v1.0.0 h1:0X1LBXxaEtYD9xsyj9B9ctQEZIpnvVDeoBx8aHEwTNA=
 github.com/ethereum/c-kzg-4844 v1.0.0/go.mod h1:VewdlzQmpT5QSrVhbBuGoCdFJkpaJlO1aQputP83wc0=
-github.com/ethereum/c-kzg-4844/v2 v2.1.1 h1:KhzBVjmURsfr1+S3k/VE35T02+AW2qU9t9gr4R6YpSo=
-github.com/ethereum/c-kzg-4844/v2 v2.1.1/go.mod h1:TC48kOKjJKPbN7C++qIgt0TJzZ70QznYR7Ob+WXl57E=
+github.com/ethereum/c-kzg-4844/v2 v2.1.5 h1:aVtoLK5xwJ6c5RiqO8g8ptJ5KU+2Hdquf6G3aXiHh5s=
+github.com/ethereum/c-kzg-4844/v2 v2.1.5/go.mod h1:u59hRTTah4Co6i9fDWtiCjTrblJv0UwsqZKCc0GfgUs=
 github.com/ethereum/go-ethereum v1.15.9 h1:bRra1zi+/q+qyXZ6fylZOrlaF8kDdnlTtzNTmNHfX+g=
 github.com/ethereum/go-ethereum v1.15.9/go.mod h1:+S9k+jFzlyVTNcYGvqFhzN/SFhI6vA+aOY4T5tLSPL0=
 github.com/ethereum/go-verkle v0.2.2 h1:I2W0WjnrFUIzzVPwm8ykY+7pL2d4VhlsePn4j7cnFk8=
@@ -1021,8 +1021,8 @@ github.com/stretchr/testify v1.8.3/go.mod h1:sz/lmYIOXD/1dqDmKjjqLyZ2RngseejIcXl
 github.com/stretchr/testify v1.8.4/go.mod h1:sz/lmYIOXD/1dqDmKjjqLyZ2RngseejIcXlSw2iwfAo=
 github.com/stretchr/testify v1.10.0 h1:Xv5erBjTwe/5IxqUQTdXv5kgmIvbHo3QQyRwhJsOfJA=
 github.com/stretchr/testify v1.10.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
-github.com/supranational/blst v0.3.14 h1:xNMoHRJOTwMn63ip6qoWJ2Ymgvj7E2b9jY2FAwY+qRo=
-github.com/supranational/blst v0.3.14/go.mod h1:jZJtfjgudtNl4en1tzwPIV3KjUnQUvG3/j+w+fVonLw=
+github.com/supranational/blst v0.3.16-0.20250831170142-f48500c1fdbe h1:nbdqkIGOGfUAD54q1s2YBcBz/WcsxCO9HUQ4aGV5hUw=
+github.com/supranational/blst v0.3.16-0.20250831170142-f48500c1fdbe/go.mod h1:jZJtfjgudtNl4en1tzwPIV3KjUnQUvG3/j+w+fVonLw=
 github.com/syndtr/goleveldb v1.0.1-0.20210819022825-2ae1ddf74ef7 h1:epCh84lMvA70Z7CTTCmYQn2CKbY8j86K7/FAIr141uY=
 github.com/syndtr/goleveldb v1.0.1-0.20210819022825-2ae1ddf74ef7/go.mod h1:q4W45IWZaF22tdD+VEXcAWRA037jwmWEB5VWYORlTpc=
 github.com/tarm/serial v0.0.0-20180830185346-98f6abe2eb07/go.mod h1:kDXzergiv9cbyO7IOYJZWg1U88JhDg3PB6klq9Hg2pA=

validator/client/service.go

@@ -230,7 +230,7 @@ func (v *ValidatorService) Start() {
 		distributed:                    v.distributed,
 		disableDutiesPolling:           v.disableDutiesPolling,
 		accountsChangedChannel:         make(chan [][fieldparams.BLSPubkeyLength]byte, 1),
-		eventsChannel:                  make(chan *eventClient.Event, 1),
+		eventsChannel:                  make(chan *eventClient.Event, 100), // 100 gives some room if the validator is slow at processing the events
 	}
 
 	hm := newHealthMonitor(v.ctx, v.cancel, v.maxHealthChecks, v.validator)