implement sparse blobpool

cmd/devp2p/internal/ethtest/conn.go

@@ -167,7 +167,7 @@ func (c *Conn) ReadEth() (any, error) {
 		case eth.TransactionsMsg:
 			msg = new(eth.TransactionsPacket)
 		case eth.NewPooledTransactionHashesMsg:
-			msg = new(eth.NewPooledTransactionHashesPacket)
+			msg = new(eth.NewPooledTransactionHashesPacket70)
 		case eth.GetPooledTransactionsMsg:
 			msg = new(eth.GetPooledTransactionsPacket)
 		case eth.PooledTransactionsMsg:

cmd/devp2p/internal/ethtest/suite.go

@@ -865,7 +865,7 @@ the transactions using a GetPooledTransactions request.`)
 	}
 
 	// Send announcement.
-	ann := eth.NewPooledTransactionHashesPacket{Types: txTypes, Sizes: sizes, Hashes: hashes}
+	ann := eth.NewPooledTransactionHashesPacket70{Types: txTypes, Sizes: sizes, Hashes: hashes}
 	err = conn.Write(ethProto, eth.NewPooledTransactionHashesMsg, ann)
 	if err != nil {
 		t.Fatalf("failed to write to connection: %v", err)
@@ -883,7 +883,7 @@ the transactions using a GetPooledTransactions request.`)
 				t.Fatalf("unexpected number of txs requested: wanted %d, got %d", len(hashes), len(msg.GetPooledTransactionsRequest))
 			}
 			return
-		case *eth.NewPooledTransactionHashesPacket:
+		case *eth.NewPooledTransactionHashesPacket70:
 			continue
 		case *eth.TransactionsPacket:
 			continue
@@ -949,12 +949,12 @@ func (s *Suite) TestBlobViolations(t *utesting.T) {
 		t2 = s.makeBlobTxs(2, 3, 0x2)
 	)
 	for _, test := range []struct {
-		ann  eth.NewPooledTransactionHashesPacket
+		ann  eth.NewPooledTransactionHashesPacket70
 		resp eth.PooledTransactionsResponse
 	}{
 		// Invalid tx size.
 		{
-			ann: eth.NewPooledTransactionHashesPacket{
+			ann: eth.NewPooledTransactionHashesPacket70{
 				Types:  []byte{types.BlobTxType, types.BlobTxType},
 				Sizes:  []uint32{uint32(t1[0].Size()), uint32(t1[1].Size() + 10)},
 				Hashes: []common.Hash{t1[0].Hash(), t1[1].Hash()},
@@ -963,7 +963,7 @@ func (s *Suite) TestBlobViolations(t *utesting.T) {
 		},
 		// Wrong tx type.
 		{
-			ann: eth.NewPooledTransactionHashesPacket{
+			ann: eth.NewPooledTransactionHashesPacket70{
 				Types:  []byte{types.DynamicFeeTxType, types.BlobTxType},
 				Sizes:  []uint32{uint32(t2[0].Size()), uint32(t2[1].Size())},
 				Hashes: []common.Hash{t2[0].Hash(), t2[1].Hash()},
@@ -1092,7 +1092,7 @@ func (s *Suite) testBadBlobTx(t *utesting.T, tx *types.Transaction, badTx *types
 			return
 		}
 
-		ann := eth.NewPooledTransactionHashesPacket{
+		ann := eth.NewPooledTransactionHashesPacket70{
 			Types:  []byte{types.BlobTxType},
 			Sizes:  []uint32{uint32(badTx.Size())},
 			Hashes: []common.Hash{badTx.Hash()},
@@ -1143,7 +1143,7 @@ func (s *Suite) testBadBlobTx(t *utesting.T, tx *types.Transaction, badTx *types
 			return
 		}
 
-		ann := eth.NewPooledTransactionHashesPacket{
+		ann := eth.NewPooledTransactionHashesPacket70{
 			Types:  []byte{types.BlobTxType},
 			Sizes:  []uint32{uint32(tx.Size())},
 			Hashes: []common.Hash{tx.Hash()},

cmd/devp2p/internal/ethtest/transaction.go

@@ -74,7 +74,7 @@ func (s *Suite) sendTxs(t *utesting.T, txs []*types.Transaction) error {
 			for _, tx := range txs {
 				got[tx.Hash()] = true
 			}
-		case *eth.NewPooledTransactionHashesPacket:
+		case *eth.NewPooledTransactionHashesPacket70:
 			for _, hash := range msg.Hashes {
 				got[hash] = true
 			}
@@ -160,7 +160,7 @@ func (s *Suite) sendInvalidTxs(t *utesting.T, txs []*types.Transaction) error {
 					return fmt.Errorf("received bad tx: %s", tx.Hash())
 				}
 			}
-		case *eth.NewPooledTransactionHashesPacket:
+		case *eth.NewPooledTransactionHashesPacket70:
 			for _, hash := range msg.Hashes {
 				if _, ok := invalids[hash]; ok {
 					return fmt.Errorf("received bad tx: %s", hash)

core/txpool/blobpool/blobpool_test.go

@@ -486,7 +486,7 @@ func verifyBlobRetrievals(t *testing.T, pool *BlobPool) {
 //   - 8. Fully duplicate transactions (matching hash) must be dropped
 //   - 9. Duplicate nonces from the same account must be dropped
 func TestOpenDrops(t *testing.T) {
-	//log.SetDefault(log.NewLogger(log.NewTerminalHandlerWithLevel(os.Stderr, log.LevelTrace, true)))
+	// log.SetDefault(log.NewLogger(log.NewTerminalHandlerWithLevel(os.Stderr, log.LevelTrace, true)))
 
 	// Create a temporary folder for the persistent backend
 	storage := t.TempDir()
@@ -513,75 +513,76 @@ func TestOpenDrops(t *testing.T) {
 		S:          new(uint256.Int),
 	})
 	blob, _ := rlp.EncodeToBytes(tx)
-	badsig, _ := store.Put(blob)
+	badsig := tx.Hash()
+	store.Put(blob)
 
 	// Insert a sequence of transactions with a nonce gap in between to verify
 	// that anything gapped will get evicted (case 3).
 	var (
 		gapper, _ = crypto.GenerateKey()
 
-		valids = make(map[uint64]struct{})
+		valids = make(map[common.Hash]struct{})
-		gapped = make(map[uint64]struct{})
+		gapped = make(map[common.Hash]struct{})
 	)
 	for _, nonce := range []uint64{0, 1, 3, 4, 6, 7} { // first gap at #2, another at #5
 		tx := makeTx(nonce, 1, 1, 1, gapper)
 		blob, _ := rlp.EncodeToBytes(tx)
 
-		id, _ := store.Put(blob)
+		store.Put(blob)
 		if nonce < 2 {
-			valids[id] = struct{}{}
+			valids[tx.Hash()] = struct{}{}
 		} else {
-			gapped[id] = struct{}{}
+			gapped[tx.Hash()] = struct{}{}
 		}
 	}
 	// Insert a sequence of transactions with a gapped starting nonce to verify
 	// that the entire set will get dropped (case 3).
 	var (
 		dangler, _ = crypto.GenerateKey()
-		dangling   = make(map[uint64]struct{})
+		dangling   = make(map[common.Hash]struct{})
 	)
 	for _, nonce := range []uint64{1, 2, 3} { // first gap at #0, all set dangling
 		tx := makeTx(nonce, 1, 1, 1, dangler)
 		blob, _ := rlp.EncodeToBytes(tx)
 
-		id, _ := store.Put(blob)
+		store.Put(blob)
-		dangling[id] = struct{}{}
+		dangling[tx.Hash()] = struct{}{}
 	}
 	// Insert a sequence of transactions with already passed nonces to veirfy
 	// that the entire set will get dropped (case 4).
 	var (
 		filler, _ = crypto.GenerateKey()
-		filled    = make(map[uint64]struct{})
+		filled    = make(map[common.Hash]struct{})
 	)
 	for _, nonce := range []uint64{0, 1, 2} { // account nonce at 3, all set filled
 		tx := makeTx(nonce, 1, 1, 1, filler)
 		blob, _ := rlp.EncodeToBytes(tx)
 
-		id, _ := store.Put(blob)
+		store.Put(blob)
-		filled[id] = struct{}{}
+		filled[tx.Hash()] = struct{}{}
 	}
 	// Insert a sequence of transactions with partially passed nonces to verify
 	// that the included part of the set will get dropped (case 4).
 	var (
 		overlapper, _ = crypto.GenerateKey()
-		overlapped    = make(map[uint64]struct{})
+		overlapped    = make(map[common.Hash]struct{})
 	)
 	for _, nonce := range []uint64{0, 1, 2, 3} { // account nonce at 2, half filled
 		tx := makeTx(nonce, 1, 1, 1, overlapper)
 		blob, _ := rlp.EncodeToBytes(tx)
 
-		id, _ := store.Put(blob)
+		store.Put(blob)
 		if nonce >= 2 {
-			valids[id] = struct{}{}
+			valids[tx.Hash()] = struct{}{}
 		} else {
-			overlapped[id] = struct{}{}
+			overlapped[tx.Hash()] = struct{}{}
 		}
 	}
 	// Insert a sequence of transactions with an underpriced first to verify that
 	// the entire set will get dropped (case 5).
 	var (
 		underpayer, _ = crypto.GenerateKey()
-		underpaid     = make(map[uint64]struct{})
+		underpaid     = make(map[common.Hash]struct{})
 	)
 	for i := 0; i < 5; i++ { // make #0 underpriced
 		var tx *types.Transaction
@@ -592,15 +593,15 @@ func TestOpenDrops(t *testing.T) {
 		}
 		blob, _ := rlp.EncodeToBytes(tx)
 
-		id, _ := store.Put(blob)
+		store.Put(blob)
-		underpaid[id] = struct{}{}
+		underpaid[tx.Hash()] = struct{}{}
 	}
 
 	// Insert a sequence of transactions with an underpriced in between to verify
 	// that it and anything newly gapped will get evicted (case 5).
 	var (
 		outpricer, _ = crypto.GenerateKey()
-		outpriced    = make(map[uint64]struct{})
+		outpriced    = make(map[common.Hash]struct{})
 	)
 	for i := 0; i < 5; i++ { // make #2 underpriced
 		var tx *types.Transaction
@@ -611,18 +612,18 @@ func TestOpenDrops(t *testing.T) {
 		}
 		blob, _ := rlp.EncodeToBytes(tx)
 
-		id, _ := store.Put(blob)
+		store.Put(blob)
 		if i < 2 {
-			valids[id] = struct{}{}
+			valids[tx.Hash()] = struct{}{}
 		} else {
-			outpriced[id] = struct{}{}
+			outpriced[tx.Hash()] = struct{}{}
 		}
 	}
 	// Insert a sequence of transactions fully overdrafted to verify that the
 	// entire set will get invalidated (case 6).
 	var (
 		exceeder, _ = crypto.GenerateKey()
-		exceeded    = make(map[uint64]struct{})
+		exceeded    = make(map[common.Hash]struct{})
 	)
 	for _, nonce := range []uint64{0, 1, 2} { // nonce 0 overdrafts the account
 		var tx *types.Transaction
@@ -633,14 +634,14 @@ func TestOpenDrops(t *testing.T) {
 		}
 		blob, _ := rlp.EncodeToBytes(tx)
 
-		id, _ := store.Put(blob)
+		store.Put(blob)
-		exceeded[id] = struct{}{}
+		exceeded[tx.Hash()] = struct{}{}
 	}
 	// Insert a sequence of transactions partially overdrafted to verify that part
 	// of the set will get invalidated (case 6).
 	var (
 		overdrafter, _ = crypto.GenerateKey()
-		overdrafted    = make(map[uint64]struct{})
+		overdrafted    = make(map[common.Hash]struct{})
 	)
 	for _, nonce := range []uint64{0, 1, 2} { // nonce 1 overdrafts the account
 		var tx *types.Transaction
@@ -651,44 +652,46 @@ func TestOpenDrops(t *testing.T) {
 		}
 		blob, _ := rlp.EncodeToBytes(tx)
 
-		id, _ := store.Put(blob)
+		store.Put(blob)
 		if nonce < 1 {
-			valids[id] = struct{}{}
+			valids[tx.Hash()] = struct{}{}
 		} else {
-			overdrafted[id] = struct{}{}
+			overdrafted[tx.Hash()] = struct{}{}
 		}
 	}
 	// Insert a sequence of transactions overflowing the account cap to verify
 	// that part of the set will get invalidated (case 7).
 	var (
 		overcapper, _ = crypto.GenerateKey()
-		overcapped    = make(map[uint64]struct{})
+		overcapped    = make(map[common.Hash]struct{})
 	)
 	for nonce := uint64(0); nonce < maxTxsPerAccount+3; nonce++ {
-		blob, _ := rlp.EncodeToBytes(makeTx(nonce, 1, 1, 1, overcapper))
+		tx := makeTx(nonce, 1, 1, 1, overcapper)
+		blob, _ := rlp.EncodeToBytes(tx)
 
-		id, _ := store.Put(blob)
+		store.Put(blob)
 		if nonce < maxTxsPerAccount {
-			valids[id] = struct{}{}
+			valids[tx.Hash()] = struct{}{}
 		} else {
-			overcapped[id] = struct{}{}
+			overcapped[tx.Hash()] = struct{}{}
 		}
 	}
 	// Insert a batch of duplicated transactions to verify that only one of each
 	// version will remain (case 8).
 	var (
 		duplicater, _ = crypto.GenerateKey()
-		duplicated    = make(map[uint64]struct{})
+		duplicated    = make(map[common.Hash]struct{})
 	)
 	for _, nonce := range []uint64{0, 1, 2} {
-		blob, _ := rlp.EncodeToBytes(makeTx(nonce, 1, 1, 1, duplicater))
+		tx := makeTx(nonce, 1, 1, 1, duplicater)
+		blob, _ := rlp.EncodeToBytes(tx)
 
 		for i := 0; i < int(nonce)+1; i++ {
-			id, _ := store.Put(blob)
+			store.Put(blob)
 			if i == 0 {
-				valids[id] = struct{}{}
+				valids[tx.Hash()] = struct{}{}
 			} else {
-				duplicated[id] = struct{}{}
+				duplicated[tx.Hash()] = struct{}{}
 			}
 		}
 	}
@@ -696,17 +699,18 @@ func TestOpenDrops(t *testing.T) {
 	// remain (case 9).
 	var (
 		repeater, _ = crypto.GenerateKey()
-		repeated    = make(map[uint64]struct{})
+		repeated    = make(map[common.Hash]struct{})
 	)
 	for _, nonce := range []uint64{0, 1, 2} {
 		for i := 0; i < int(nonce)+1; i++ {
-			blob, _ := rlp.EncodeToBytes(makeTx(nonce, 1, uint64(i)+1 /* unique hashes */, 1, repeater))
+			tx := makeTx(nonce, 1, uint64(i)+1 /* unique hashes */, 1, repeater)
+			blob, _ := rlp.EncodeToBytes(tx)
 
-			id, _ := store.Put(blob)
+			store.Put(blob)
 			if i == 0 {
-				valids[id] = struct{}{}
+				valids[tx.Hash()] = struct{}{}
 			} else {
-				repeated[id] = struct{}{}
+				repeated[tx.Hash()] = struct{}{}
 			}
 		}
 	}
@@ -743,39 +747,41 @@ func TestOpenDrops(t *testing.T) {
 
 	// Verify that the malformed (case 1), badly signed (case 2) and gapped (case
 	// 3) txs have been deleted from the pool
-	alive := make(map[uint64]struct{})
+	alive := make(map[common.Hash]struct{})
 	for _, txs := range pool.index {
 		for _, tx := range txs {
 			switch tx.id {
 			case malformed:
 				t.Errorf("malformed RLP transaction remained in storage")
-			case badsig:
-				t.Errorf("invalidly signed transaction remained in storage")
 			default:
-				if _, ok := dangling[tx.id]; ok {
+				if badsig == tx.hash {
+					t.Errorf("invalidly signed transaction remained in storage")
+				}
+				if _, ok := dangling[tx.hash]; ok {
 					t.Errorf("dangling transaction remained in storage: %d", tx.id)
-				} else if _, ok := filled[tx.id]; ok {
+				} else if _, ok := filled[tx.hash]; ok {
 					t.Errorf("filled transaction remained in storage: %d", tx.id)
-				} else if _, ok := overlapped[tx.id]; ok {
+				} else if _, ok := overlapped[tx.hash]; ok {
 					t.Errorf("overlapped transaction remained in storage: %d", tx.id)
-				} else if _, ok := gapped[tx.id]; ok {
+				} else if _, ok := gapped[tx.hash]; ok {
 					t.Errorf("gapped transaction remained in storage: %d", tx.id)
-				} else if _, ok := underpaid[tx.id]; ok {
+				} else if _, ok := underpaid[tx.hash]; ok {
 					t.Errorf("underpaid transaction remained in storage: %d", tx.id)
-				} else if _, ok := outpriced[tx.id]; ok {
+				} else if _, ok := outpriced[tx.hash]; ok {
 					t.Errorf("outpriced transaction remained in storage: %d", tx.id)
-				} else if _, ok := exceeded[tx.id]; ok {
+				} else if _, ok := exceeded[tx.hash]; ok {
 					t.Errorf("fully overdrafted transaction remained in storage: %d", tx.id)
-				} else if _, ok := overdrafted[tx.id]; ok {
+				} else if _, ok := overdrafted[tx.hash]; ok {
 					t.Errorf("partially overdrafted transaction remained in storage: %d", tx.id)
-				} else if _, ok := overcapped[tx.id]; ok {
+				} else if _, ok := overcapped[tx.hash]; ok {
 					t.Errorf("overcapped transaction remained in storage: %d", tx.id)
-				} else if _, ok := duplicated[tx.id]; ok {
+				} else if _, ok := repeated[tx.hash]; ok {
-					t.Errorf("duplicated transaction remained in storage: %d", tx.id)
-				} else if _, ok := repeated[tx.id]; ok {
 					t.Errorf("repeated nonce transaction remained in storage: %d", tx.id)
 				} else {
-					alive[tx.id] = struct{}{}
+					if _, ok := alive[tx.hash]; ok {
+						t.Errorf("duplicated transaction remained in storage: %d", tx.id)
+					}
+					alive[tx.hash] = struct{}{}
 				}
 			}
 		}
@@ -784,14 +790,14 @@ func TestOpenDrops(t *testing.T) {
 	if len(alive) != len(valids) {
 		t.Errorf("valid transaction count mismatch: have %d, want %d", len(alive), len(valids))
 	}
-	for id := range alive {
+	for hash := range alive {
-		if _, ok := valids[id]; !ok {
+		if _, ok := valids[hash]; !ok {
-			t.Errorf("extra transaction %d", id)
+			t.Errorf("extra transaction %s", hash)
 		}
 	}
-	for id := range valids {
+	for hash := range valids {
-		if _, ok := alive[id]; !ok {
+		if _, ok := alive[hash]; !ok {
-			t.Errorf("missing transaction %d", id)
+			t.Errorf("missing transaction %s", hash)
 		}
 	}
 	// Verify all the calculated pool internals. Interestingly, this is **not**
@@ -1010,7 +1016,10 @@ func TestOpenCap(t *testing.T) {
 
 		keep = []common.Address{addr1, addr3}
 		drop = []common.Address{addr2}
-		size = 2 * (txAvgSize + blobSize + uint64(txBlobOverhead))
+		// After migration to pooledBlobTx, cells (128 x 2048 = 2*blobSize) replace blobs.
+		// The actual billy slot size for pooledBlobTx is 2*(blobSize+txBlobOverhead)+txAvgSize.
+		pooledSlotSize uint64 = 2*(blobSize+uint64(txBlobOverhead)) + txAvgSize
+		size                  = 2 * pooledSlotSize
 	)
 	store.Put(blob1)
 	store.Put(blob2)
@@ -1019,7 +1028,7 @@ func TestOpenCap(t *testing.T) {
 
 	// Verify pool capping twice: first by reducing the data cap, then restarting
 	// with a high cap to ensure everything was persisted previously
-	for _, datacap := range []uint64{2 * (txAvgSize + blobSize + uint64(txBlobOverhead)), 1000 * (txAvgSize + blobSize + uint64(txBlobOverhead))} {
+	for _, datacap := range []uint64{size, 1000 * pooledSlotSize} {
 		// Create a blob pool out of the pre-seeded data, but cap it to 2 blob transaction
 		statedb, _ := state.New(types.EmptyRootHash, state.NewDatabaseForTesting())
 		statedb.AddBalance(addr1, uint256.NewInt(1_000_000_000), tracing.BalanceChangeUnspecified)
@@ -1325,7 +1334,7 @@ func TestBlobCountLimit(t *testing.T) {
 
 	// Check that first succeeds second fails.
 	if errs[0] != nil {
-		t.Fatalf("expected tx with 7 blobs to succeed, got %v", errs[0])
+		t.Fatalf("expected tx with 7 blobs to succeed, got: %v", errs[0])
 	}
 	if !errors.Is(errs[1], txpool.ErrTxBlobLimitExceeded) {
 		t.Fatalf("expected tx with 8 blobs to fail, got: %v", errs[1])
@@ -2112,7 +2121,8 @@ func benchmarkPoolPending(b *testing.B, datacap uint64) {
 			b.Fatal(err)
 		}
 		statedb.AddBalance(addr, uint256.NewInt(1_000_000_000), tracing.BalanceChangeUnspecified)
-		pool.add(tx)
+		pooledTx, _ := newPooledBlobTx(tx)
+		pool.add(pooledTx)
 	}
 	statedb.Commit(0, true, false)
 	defer pool.Close()
@@ -2133,3 +2143,117 @@ func benchmarkPoolPending(b *testing.B, datacap uint64) {
 		}
 	}
 }
+
+func TestGetCells(t *testing.T) {
+	storage := t.TempDir()
+
+	os.MkdirAll(filepath.Join(storage, pendingTransactionStore), 0700)
+	store, _ := billy.Open(billy.Options{Path: filepath.Join(storage, pendingTransactionStore)}, newSlotter(params.BlobTxMaxBlobs), nil)
+
+	var (
+		key1, _ = crypto.GenerateKey()
+
+		addr1 = crypto.PubkeyToAddress(key1.PublicKey)
+
+		tx1 = makeMultiBlobTx(0, 1, 1000, 100, 3, 0, key1, types.BlobSidecarVersion1) // blobs [0, 3)
+
+		pooledTx1, _ = newPooledBlobTx(tx1)
+
+		blob1, _ = rlp.EncodeToBytes(pooledTx1)
+	)
+
+	store.Put(blob1)
+	store.Close()
+
+	statedb, _ := state.New(types.EmptyRootHash, state.NewDatabaseForTesting())
+	statedb.AddBalance(addr1, uint256.NewInt(1_000_000_000), tracing.BalanceChangeUnspecified)
+	statedb.Commit(0, true, false)
+
+	chain := &testBlockChain{
+		config:  params.MainnetChainConfig,
+		basefee: uint256.NewInt(params.InitialBaseFee),
+		blobfee: uint256.NewInt(params.BlobTxMinBlobGasprice),
+		statedb: statedb,
+	}
+	pool := New(Config{Datadir: storage}, chain, nil)
+	if err := pool.Init(1, chain.CurrentBlock(), newReserver()); err != nil {
+		t.Fatalf("failed to create blob pool: %v", err)
+	}
+	defer pool.Close()
+
+	tests := []struct {
+		name        string
+		hash        common.Hash
+		mask        types.CustodyBitmap
+		expectedLen int
+		shouldFail  bool
+	}{
+		{
+			name:        "Get cells with single index",
+			hash:        tx1.Hash(),
+			mask:        types.NewCustodyBitmap([]uint64{5}),
+			expectedLen: 3,
+			shouldFail:  false,
+		},
+		{
+			name:        "Get cells with all indices",
+			hash:        tx1.Hash(),
+			mask:        *types.CustodyBitmapAll,
+			expectedLen: 384,
+			shouldFail:  false,
+		},
+		{
+			name:        "Get cells with no indices",
+			hash:        tx1.Hash(),
+			mask:        types.CustodyBitmap{},
+			expectedLen: 0,
+			shouldFail:  false,
+		},
+		{
+			name:        "Get cells for non-existent transaction",
+			hash:        common.Hash{0x01, 0x02, 0x03},
+			mask:        types.NewCustodyBitmap([]uint64{0, 1}),
+			expectedLen: 0,
+			shouldFail:  true,
+		},
+		{
+			name:        "Get cells with random indices",
+			hash:        tx1.Hash(),
+			mask:        types.NewRandomCustodyBitmap(8),
+			expectedLen: 24,
+			shouldFail:  false,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			cells, err := pool.GetCells(tt.hash, tt.mask)
+
+			if err != nil && !tt.shouldFail {
+				t.Errorf("expected to success, got %v", err)
+			}
+			if err == nil && tt.shouldFail {
+				t.Errorf("expected to fail, got %v", err)
+			}
+
+			if len(cells) != tt.expectedLen {
+				t.Errorf("expected %d cells, got %d", tt.expectedLen, len(cells))
+			}
+
+			if tt.expectedLen > 0 && tt.expectedLen%3 == 0 {
+				blobCount := 3
+				cellsPerBlob := tt.expectedLen / blobCount
+
+				for blobIdx := 0; blobIdx < blobCount; blobIdx++ {
+					startIdx := blobIdx * cellsPerBlob
+					endIdx := startIdx + cellsPerBlob
+
+					if endIdx > len(cells) {
+						t.Errorf("blob %d: expected cells up to index %d, but only have %d cells",
+							blobIdx, endIdx-1, len(cells))
+					}
+				}
+			}
+		})
+	}
+}

core/txpool/blobpool/limbo.go

@@ -33,7 +33,7 @@ import (
 type limboBlob struct {
 	TxHash common.Hash // Owner transaction's hash to support resurrecting reorged txs
 	Block  uint64      // Block in which the blob transaction was included
-	Tx     *types.Transaction
+	Tx     *pooledBlobTx
 }
 
 // limbo is a light, indexed database to temporarily store recently included
@@ -146,15 +146,15 @@ func (l *limbo) finalize(final *types.Header) {
 
 // push stores a new blob transaction into the limbo, waiting until finality for
 // it to be automatically evicted.
-func (l *limbo) push(tx *types.Transaction, block uint64) error {
+func (l *limbo) push(tx *pooledBlobTx, block uint64) error {
 	// If the blobs are already tracked by the limbo, consider it a programming
 	// error. There's not much to do against it, but be loud.
-	if _, ok := l.index[tx.Hash()]; ok {
+	if _, ok := l.index[tx.Transaction.Hash()]; ok {
-		log.Error("Limbo cannot push already tracked blobs", "tx", tx.Hash())
+		log.Error("Limbo cannot push already tracked blobs", "tx", tx.Transaction.Hash())
 		return errors.New("already tracked blob transaction")
 	}
 	if err := l.setAndIndex(tx, block); err != nil {
-		log.Error("Failed to set and index limboed blobs", "tx", tx.Hash(), "err", err)
+		log.Error("Failed to set and index limboed blobs", "tx", tx.Transaction.Hash(), "err", err)
 		return err
 	}
 	return nil
@@ -163,7 +163,7 @@ func (l *limbo) push(tx *types.Transaction, block uint64) error {
 // pull retrieves a previously pushed set of blobs back from the limbo, removing
 // it at the same time. This method should be used when a previously included blob
 // transaction gets reorged out.
-func (l *limbo) pull(tx common.Hash) (*types.Transaction, error) {
+func (l *limbo) pull(tx common.Hash) (*pooledBlobTx, error) {
 	// If the blobs are not tracked by the limbo, there's not much to do. This
 	// can happen for example if a blob transaction is mined without pushing it
 	// into the network first.
@@ -240,8 +240,8 @@ func (l *limbo) getAndDrop(id uint64) (*limboBlob, error) {
 
 // setAndIndex assembles a limbo blob database entry and stores it, also updating
 // the in-memory indices.
-func (l *limbo) setAndIndex(tx *types.Transaction, block uint64) error {
+func (l *limbo) setAndIndex(tx *pooledBlobTx, block uint64) error {
-	txhash := tx.Hash()
+	txhash := tx.Transaction.Hash()
 	item := &limboBlob{
 		TxHash: txhash,
 		Block:  block,

core/txpool/blobpool/lookup.go

@@ -18,11 +18,13 @@ package blobpool
 
 import (
 	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/core/types"
 )
 
 type txMetadata struct {
-	id   uint64 // the billy id of transction
+	id      uint64 // the billy id of transction
-	size uint64 // the RLP encoded size of transaction (blobs are included)
+	size    uint64 // the RLP encoded size of transaction (blobs are included)
+	custody types.CustodyBitmap
 }
 
 // lookup maps blob versioned hashes to transaction hashes that include them,
@@ -91,8 +93,9 @@ func (l *lookup) track(tx *blobTxMeta) {
 	}
 	// Map the transaction hash to the datastore id and RLP-encoded transaction size
 	l.txIndex[tx.hash] = &txMetadata{
-		id:   tx.id,
+		id:      tx.id,
-		size: tx.size,
+		size:    tx.size,
+		custody: *tx.custody,
 	}
 }
 

core/txpool/legacypool/legacypool.go

@@ -1011,7 +1011,7 @@ func (pool *LegacyPool) get(hash common.Hash) *types.Transaction {
 }
 
 // GetRLP returns a RLP-encoded transaction if it is contained in the pool.
-func (pool *LegacyPool) GetRLP(hash common.Hash) []byte {
+func (pool *LegacyPool) GetRLP(hash common.Hash, _ bool) []byte {
 	tx := pool.all.Get(hash)
 	if tx == nil {
 		return nil

core/txpool/subpool.go

@@ -132,7 +132,8 @@ type SubPool interface {
 	Get(hash common.Hash) *types.Transaction
 
 	// GetRLP returns a RLP-encoded transaction if it is contained in the pool.
-	GetRLP(hash common.Hash) []byte
+	// If includeBlob is false, blob data is stripped from blob transactions (ETH/71).
+	GetRLP(hash common.Hash, includeBlob bool) []byte
 
 	// GetMetadata returns the transaction type and transaction size with the
 	// given transaction hash.

core/txpool/txpool.go

@@ -284,9 +284,9 @@ func (p *TxPool) Get(hash common.Hash) *types.Transaction {
 }
 
 // GetRLP returns a RLP-encoded transaction if it is contained in the pool.
-func (p *TxPool) GetRLP(hash common.Hash) []byte {
+func (p *TxPool) GetRLP(hash common.Hash, includeBlob bool) []byte {
 	for _, subpool := range p.subpools {
-		encoded := subpool.GetRLP(hash)
+		encoded := subpool.GetRLP(hash, includeBlob)
 		if len(encoded) != 0 {
 			return encoded
 		}

core/txpool/validation.go

@@ -64,9 +64,6 @@ func ValidateTransaction(tx *types.Transaction, head *types.Header, signer types
 	if opts.Accept&(1<<tx.Type()) == 0 {
 		return fmt.Errorf("%w: tx type %v not supported by this pool", core.ErrTxTypeNotSupported, tx.Type())
 	}
-	if blobCount := len(tx.BlobHashes()); blobCount > opts.MaxBlobCount {
-		return fmt.Errorf("%w: blob count %v, limit %v", ErrTxBlobLimitExceeded, blobCount, opts.MaxBlobCount)
-	}
 	// Before performing any expensive validations, sanity check that the tx is
 	// smaller than the maximum limit the pool can meaningfully handle
 	if tx.Size() > opts.MaxSize {
@@ -146,9 +143,6 @@ func ValidateTransaction(tx *types.Transaction, head *types.Header, signer types
 	if tx.GasTipCapIntCmp(opts.MinTip) < 0 {
 		return fmt.Errorf("%w: gas tip cap %v, minimum needed %v", ErrTxGasPriceTooLow, tx.GasTipCap(), opts.MinTip)
 	}
-	if tx.Type() == types.BlobTxType {
-		return validateBlobTx(tx, head, opts)
-	}
 	if tx.Type() == types.SetCodeTxType {
 		if len(tx.SetCodeAuthorizations()) == 0 {
 			return errors.New("set code tx must have at least one authorization tuple")
@@ -157,14 +151,33 @@ func ValidateTransaction(tx *types.Transaction, head *types.Header, signer types
 	return nil
 }
 
-// validateBlobTx implements the blob-transaction specific validations.
+func ValidateBlobSidecar(tx *types.Transaction, sidecar *types.BlobTxCellSidecar, head *types.Header, opts *ValidationOptions) error {
-func validateBlobTx(tx *types.Transaction, head *types.Header, opts *ValidationOptions) error {
+	if sidecar.Custody.OneCount() == 0 {
-	sidecar := tx.BlobTxSidecar()
+		return errors.New("blobless blob transaction")
-	if sidecar == nil {
-		return errors.New("missing sidecar in blob transaction")
 	}
-	// Ensure the sidecar is constructed with the correct version, consistent
+	// Ensure the blob fee cap satisfies the minimum blob gas price
-	// with the current fork.
+	if tx.BlobGasFeeCapIntCmp(blobTxMinBlobGasPrice) < 0 {
+		return fmt.Errorf("%w: blob fee cap %v, minimum needed %v", ErrTxGasPriceTooLow, tx.BlobGasFeeCap(), blobTxMinBlobGasPrice)
+	}
+	// Verify whether the blob count is consistent with other parts of the sidecar and the transaction
+	blobCount := len(sidecar.Cells) / sidecar.Custody.OneCount()
+	hashes := tx.BlobHashes()
+	if blobCount == 0 {
+		return errors.New("blobless blob transaction")
+	}
+	if blobCount != len(sidecar.Commitments) || blobCount != len(hashes) {
+		return fmt.Errorf("invalid number of %d blobs compared to %d commitments and %d blob hashes", blobCount, len(sidecar.Commitments), len(tx.BlobHashes()))
+	}
+
+	// Check whether the blob count does not exceed the max blob count
+	if blobCount > opts.MaxBlobCount {
+		return fmt.Errorf("%w: blob count %v, limit %v", ErrTxBlobLimitExceeded, blobCount, opts.MaxBlobCount)
+	}
+
+	if err := sidecar.ValidateBlobCommitmentHashes(hashes); err != nil {
+		return err
+	}
+	// Ensure the sidecar version is correct for the current fork (master: bd77b77ed)
 	version := types.BlobSidecarVersion0
 	if opts.Config.IsOsaka(head.Number, head.Time) {
 		version = types.BlobSidecarVersion1
@@ -172,50 +185,42 @@ func validateBlobTx(tx *types.Transaction, head *types.Header, opts *ValidationO
 	if sidecar.Version != version {
 		return fmt.Errorf("unexpected sidecar version, want: %d, got: %d", version, sidecar.Version)
 	}
-	// Ensure the blob fee cap satisfies the minimum blob gas price
-	if tx.BlobGasFeeCapIntCmp(blobTxMinBlobGasPrice) < 0 {
-		return fmt.Errorf("%w: blob fee cap %v, minimum needed %v", ErrTxGasPriceTooLow, tx.BlobGasFeeCap(), blobTxMinBlobGasPrice)
-	}
-	// Ensure the number of items in the blob transaction and various side
-	// data match up before doing any expensive validations
-	hashes := tx.BlobHashes()
-	if len(hashes) == 0 {
-		return errors.New("blobless blob transaction")
-	}
-	if len(hashes) > params.BlobTxMaxBlobs {
-		return fmt.Errorf("too many blobs in transaction: have %d, permitted %d", len(hashes), params.BlobTxMaxBlobs)
-	}
-	if len(sidecar.Blobs) != len(hashes) {
-		return fmt.Errorf("invalid number of %d blobs compared to %d blob hashes", len(sidecar.Blobs), len(hashes))
-	}
-	if err := sidecar.ValidateBlobCommitmentHashes(hashes); err != nil {
-		return err
-	}
 	// Fork-specific sidecar checks, including proof verification.
 	if sidecar.Version == types.BlobSidecarVersion1 {
 		return validateBlobSidecarOsaka(sidecar, hashes)
-	} else {
-		return validateBlobSidecarLegacy(sidecar, hashes)
 	}
+	return validateBlobSidecarLegacy(sidecar, hashes)
 }
 
-func validateBlobSidecarLegacy(sidecar *types.BlobTxSidecar, hashes []common.Hash) error {
+func validateBlobSidecarLegacy(sidecar *types.BlobTxCellSidecar, hashes []common.Hash) error {
 	if len(sidecar.Proofs) != len(hashes) {
 		return fmt.Errorf("invalid number of %d blob proofs expected %d", len(sidecar.Proofs), len(hashes))
 	}
-	for i := range sidecar.Blobs {
+	blobs, err := kzg4844.RecoverBlobs(sidecar.Cells, sidecar.Custody.Indices())
-		if err := kzg4844.VerifyBlobProof(&sidecar.Blobs[i], sidecar.Commitments[i], sidecar.Proofs[i]); err != nil {
+	if err != nil {
-			return fmt.Errorf("%w: invalid blob proof: %v", ErrKZGVerificationError, err)
+		return fmt.Errorf("%w: %v", ErrKZGVerificationError, err)
+	}
+	for i := range blobs {
+		if err := kzg4844.VerifyBlobProof(&blobs[i], sidecar.Commitments[i], sidecar.Proofs[i]); err != nil {
+			return fmt.Errorf("%w: invalid blob %d: %v", ErrKZGVerificationError, i, err)
 		}
 	}
 	return nil
 }
 
-func validateBlobSidecarOsaka(sidecar *types.BlobTxSidecar, hashes []common.Hash) error {
+func validateBlobSidecarOsaka(sidecar *types.BlobTxCellSidecar, hashes []common.Hash) error {
 	if len(sidecar.Proofs) != len(hashes)*kzg4844.CellProofsPerBlob {
 		return fmt.Errorf("invalid number of %d blob proofs expected %d", len(sidecar.Proofs), len(hashes)*kzg4844.CellProofsPerBlob)
 	}
-	if err := kzg4844.VerifyCellProofs(sidecar.Blobs, sidecar.Commitments, sidecar.Proofs); err != nil {
+	indices := sidecar.Custody.Indices()
+	cellProofs := make([]kzg4844.Proof, 0)
+	for blobIdx := range len(sidecar.Commitments) {
+		for _, proofIdx := range indices {
+			idx := blobIdx*kzg4844.CellProofsPerBlob + int(proofIdx)
+			cellProofs = append(cellProofs, sidecar.Proofs[idx])
+		}
+	}
+	if err := kzg4844.VerifyCells(sidecar.Cells, sidecar.Commitments, cellProofs, sidecar.Custody.Indices()); err != nil {
 		return fmt.Errorf("%w: %v", ErrKZGVerificationError, err)
 	}
 	return nil

core/types/custody_bitmap.go

@@ -0,0 +1,132 @@
+// Copyright 2026 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package types
+
+import (
+	"math/bits"
+	"math/rand"
+
+	"github.com/ethereum/go-ethereum/crypto/kzg4844"
+)
+
+// `CustodyBitmap` is a bitmap to represent which custody index to store (little endian)
+type CustodyBitmap [16]byte
+
+var (
+	CustodyBitmapAll = func() *CustodyBitmap {
+		var result CustodyBitmap
+		for i := range result {
+			result[i] = 0xFF
+		}
+		return &result
+	}()
+
+	CustodyBitmapData = func() *CustodyBitmap {
+		var result CustodyBitmap
+		for i := 0; i < kzg4844.DataPerBlob/8; i++ {
+			result[i] = 0xFF
+		}
+		return &result
+	}()
+)
+
+func NewCustodyBitmap(indices []uint64) CustodyBitmap {
+	var result CustodyBitmap
+	for _, i := range indices {
+		if i >= uint64(kzg4844.CellsPerBlob) {
+			panic("CustodyBitmap: bit index out of range")
+		}
+		result[i/8] |= 1 << (i % 8)
+	}
+	return result
+}
+
+// NewRandomCustodyBitmap creates a CustodyBitmap with n randomly selected indices.
+// This should be used only for tests.
+func NewRandomCustodyBitmap(n int) CustodyBitmap {
+	if n <= 0 || n > kzg4844.CellsPerBlob {
+		panic("CustodyBitmap: invalid number of indices")
+	}
+	indices := make([]uint64, 0, n)
+	used := make(map[uint64]bool)
+	for len(indices) < n {
+		idx := uint64(rand.Intn(kzg4844.CellsPerBlob))
+		if !used[idx] {
+			used[idx] = true
+			indices = append(indices, idx)
+		}
+	}
+	return NewCustodyBitmap(indices)
+}
+
+// IsSet returns whether bit i is set.
+func (b CustodyBitmap) IsSet(i uint64) bool {
+	if i >= uint64(kzg4844.CellsPerBlob) {
+		return false
+	}
+	return (b[i/8]>>(i%8))&1 == 1
+}
+
+// OneCount returns the number of bits set to 1.
+func (b CustodyBitmap) OneCount() int {
+	total := 0
+	for _, v := range b {
+		total += bits.OnesCount8(v)
+	}
+	return total
+}
+
+// Indices returns the bit positions set to 1, in ascending order.
+func (b CustodyBitmap) Indices() []uint64 {
+	out := make([]uint64, 0, b.OneCount())
+	for byteIdx, val := range b {
+		v := val
+		for v != 0 {
+			tz := bits.TrailingZeros8(v)
+			out = append(out, uint64(byteIdx*8+tz))
+			v &^= 1 << tz
+		}
+	}
+	return out
+}
+
+// Difference returns b AND NOT set (bits in b but not in set).
+func (b CustodyBitmap) Difference(set *CustodyBitmap) *CustodyBitmap {
+	var out CustodyBitmap
+	for i := range b {
+		out[i] = b[i] &^ set[i]
+	}
+	return &out
+}
+
+// Intersection returns b AND set.
+func (b CustodyBitmap) Intersection(set *CustodyBitmap) *CustodyBitmap {
+	var out CustodyBitmap
+	for i := range b {
+		out[i] = b[i] & set[i]
+	}
+	return &out
+}
+
+// Union returns b OR set.
+func (b CustodyBitmap) Union(set *CustodyBitmap) *CustodyBitmap {
+	var out CustodyBitmap
+	for i := range b {
+		out[i] = b[i] | set[i]
+	}
+	return &out
+}

core/types/transaction.go

@@ -510,6 +510,18 @@ func (tx *Transaction) WithoutBlobTxSidecar() *Transaction {
 	return cpy
 }
 
+// WithoutBlob returns a copy of tx with the blob data removed from the sidecar,
+// keeping commitments, proofs and other metadata intact.
+func (tx *Transaction) WithoutBlob() *Transaction {
+	blobtx, ok := tx.inner.(*BlobTx)
+	if !ok || blobtx.Sidecar == nil {
+		return tx
+	}
+	sidecarWithoutBlob := blobtx.Sidecar.Copy()
+	sidecarWithoutBlob.Blobs = nil
+	return tx.WithBlobTxSidecar(sidecarWithoutBlob)
+}
+
 // WithBlobTxSidecar returns a copy of tx with the blob sidecar added.
 func (tx *Transaction) WithBlobTxSidecar(sideCar *BlobTxSidecar) *Transaction {
 	blobtx, ok := tx.inner.(*BlobTx)

core/types/tx_blob.go

@@ -176,6 +176,37 @@ func (sc *BlobTxSidecar) Copy() *BlobTxSidecar {
 	}
 }
 
+func (sc *BlobTxSidecar) ToBlobTxCellSidecar() (*BlobTxCellSidecar, error) {
+	cells, err := kzg4844.ComputeCells(sc.Blobs)
+	if err != nil {
+		return nil, err
+	}
+	return &BlobTxCellSidecar{
+		Version:     sc.Version,
+		Cells:       cells,
+		Commitments: sc.Commitments,
+		Proofs:      sc.Proofs,
+		Custody:     *CustodyBitmapAll,
+	}, nil
+}
+
+type BlobTxCellSidecar struct {
+	Version     byte
+	Cells       []kzg4844.Cell
+	Commitments []kzg4844.Commitment
+	Proofs      []kzg4844.Proof
+	Custody     CustodyBitmap
+}
+
+// ValidateBlobCommitmentHashes checks whether the given hashes correspond to the
+// commitments in the sidecar
+func (c *BlobTxCellSidecar) ValidateBlobCommitmentHashes(hashes []common.Hash) error {
+	sc := BlobTxSidecar{
+		Commitments: c.Commitments,
+	}
+	return sc.ValidateBlobCommitmentHashes(hashes)
+}
+
 // blobTxWithBlobs represents blob tx with its corresponding sidecar.
 // This is an interface because sidecars are versioned.
 type blobTxWithBlobs interface {

crypto/kzg4844/kzg4844.go

@@ -34,9 +34,27 @@ var (
 	blobT       = reflect.TypeFor[Blob]()
 	commitmentT = reflect.TypeFor[Commitment]()
 	proofT      = reflect.TypeFor[Proof]()
+	cellT       = reflect.TypeFor[Cell]()
 )
 
-const CellProofsPerBlob = 128
+const (
+	CellProofsPerBlob = 128
+	CellsPerBlob      = 128
+	DataPerBlob       = 64
+)
+
+// Cell represents a single cell in a blob.
+type Cell [2048]byte
+
+// UnmarshalJSON parses a cell in hex syntax.
+func (c *Cell) UnmarshalJSON(input []byte) error {
+	return hexutil.UnmarshalFixedJSON(cellT, input, c[:])
+}
+
+// MarshalText returns the hex representation of c.
+func (c *Cell) MarshalText() ([]byte, error) {
+	return hexutil.Bytes(c[:]).MarshalText()
+}
 
 // Blob represents a 4844 data blob.
 type Blob [131072]byte
@@ -189,3 +207,27 @@ func CalcBlobHashV1(hasher hash.Hash, commit *Commitment) (vh [32]byte) {
 func IsValidVersionedHash(h []byte) bool {
 	return len(h) == 32 && h[0] == 0x01
 }
+
+// VerifyCells verifies a batch of proofs corresponding to the cells and commitments.
+func VerifyCells(cells []Cell, commitments []Commitment, proofs []Proof, cellIndices []uint64) error {
+	if useCKZG.Load() {
+		return ckzgVerifyCells(cells, commitments, proofs, cellIndices)
+	}
+	return gokzgVerifyCells(cells, commitments, proofs, cellIndices)
+}
+
+// ComputeCells computes the cells from the given blobs.
+func ComputeCells(blobs []Blob) ([]Cell, error) {
+	if useCKZG.Load() {
+		return ckzgComputeCells(blobs)
+	}
+	return gokzgComputeCells(blobs)
+}
+
+// RecoverBlobs recovers blobs from the given cells and cell indices.
+func RecoverBlobs(cells []Cell, cellIndices []uint64) ([]Blob, error) {
+	if useCKZG.Load() {
+		return ckzgRecoverBlobs(cells, cellIndices)
+	}
+	return gokzgRecoverBlobs(cells, cellIndices)
+}

crypto/kzg4844/kzg4844_ckzg_cgo.go

@@ -190,3 +190,90 @@ func ckzgVerifyCellProofBatch(blobs []Blob, commitments []Commitment, cellProofs
 	}
 	return nil
 }
+
+func ckzgVerifyCells(cells []Cell, commitments []Commitment, cellProofs []Proof, cellIndices []uint64) error {
+	ckzgIniter.Do(ckzgInit)
+	var (
+		proofs   = make([]ckzg4844.Bytes48, len(cellProofs))
+		commits  = make([]ckzg4844.Bytes48, 0, len(cellProofs))
+		indices  = make([]uint64, 0, len(cellProofs))
+		kzgcells = make([]ckzg4844.Cell, 0, len(cellProofs))
+	)
+	for i := range cellProofs {
+		proofs[i] = (ckzg4844.Bytes48)(cellProofs[i])
+		kzgcells = append(kzgcells, (ckzg4844.Cell)(cells[i]))
+	}
+	if len(cellProofs)%len(commitments) != 0 {
+		return errors.New("wrong cell proofs and commitments length")
+	}
+	cellCounts := len(cellProofs) / len(commitments)
+	for _, commitment := range commitments {
+		for j := 0; j < cellCounts; j++ {
+			commits = append(commits, (ckzg4844.Bytes48)(commitment))
+		}
+	}
+	blobCounts := len(cellProofs) / len(cellIndices)
+	for j := 0; j < blobCounts; j++ {
+		indices = append(indices, cellIndices...)
+	}
+
+	valid, err := ckzg4844.VerifyCellKZGProofBatch(commits, indices, kzgcells, proofs)
+	if err != nil {
+		return err
+	}
+	if !valid {
+		return errors.New("invalid proof")
+	}
+	return nil
+}
+
+func ckzgComputeCells(blobs []Blob) ([]Cell, error) {
+	ckzgIniter.Do(ckzgInit)
+	cells := make([]Cell, 0, ckzg4844.CellsPerExtBlob*len(blobs))
+
+	for i := range blobs {
+		cellsI, err := ckzg4844.ComputeCells((*ckzg4844.Blob)(&blobs[i]))
+		if err != nil {
+			return []Cell{}, err
+		}
+		for _, c := range cellsI {
+			cells = append(cells, Cell(c))
+		}
+	}
+	return cells, nil
+}
+
+func ckzgRecoverBlobs(cells []Cell, cellIndices []uint64) ([]Blob, error) {
+	ckzgIniter.Do(ckzgInit)
+
+	if len(cellIndices) == 0 || len(cells)%len(cellIndices) != 0 {
+		return []Blob{}, errors.New("cells with wrong length")
+	}
+
+	blobCount := len(cells) / len(cellIndices)
+	blobs := make([]Blob, 0, blobCount)
+
+	offset := 0
+	for range blobCount {
+		kzgcells := make([]ckzg4844.Cell, 0, len(cellIndices))
+
+		for _, cell := range cells[offset : offset+len(cellIndices)] {
+			kzgcells = append(kzgcells, ckzg4844.Cell(cell))
+		}
+
+		extCells, err := ckzg4844.RecoverCells(cellIndices, kzgcells)
+		if err != nil {
+			return []Blob{}, err
+		}
+
+		var blob Blob
+		for i, cell := range extCells[:64] {
+			copy(blob[i*len(cell):], cell[:])
+		}
+		blobs = append(blobs, blob)
+
+		offset = offset + len(cellIndices)
+	}
+
+	return blobs, nil
+}

crypto/kzg4844/kzg4844_ckzg_nocgo.go

@@ -73,3 +73,15 @@ func ckzgVerifyCellProofBatch(blobs []Blob, commitments []Commitment, proof []Pr
 func ckzgComputeCellProofs(blob *Blob) ([]Proof, error) {
 	panic("unsupported platform")
 }
+
+func ckzgVerifyCells(cells []Cell, commitments []Commitment, cellProofs []Proof, cellIndices []uint64) error {
+	panic("unsupported platform")
+}
+
+func ckzgComputeCells(blobs []Blob) ([]Cell, error) {
+	panic("unsupported platform")
+}
+
+func ckzgRecoverBlobs(cells []Cell, cellIndices []uint64) ([]Blob, error) {
+	panic("unsupported platform")
+}

crypto/kzg4844/kzg4844_gokzg.go

@@ -18,6 +18,7 @@ package kzg4844
 
 import (
 	"encoding/json"
+	"errors"
 	"sync"
 
 	gokzg4844 "github.com/crate-crypto/go-eth-kzg"
@@ -148,3 +149,92 @@ func gokzgVerifyCellProofBatch(blobs []Blob, commitments []Commitment, cellProof
 	}
 	return context.VerifyCellKZGProofBatch(commits, cellIndices, cells[:], proofs)
 }
+
+// gokzgVerifyCells verifies that the cell data corresponds to the provided commitment.
+func gokzgVerifyCells(cells []Cell, commitments []Commitment, cellProofs []Proof, cellIndices []uint64) error {
+	gokzgIniter.Do(gokzgInit)
+	var (
+		proofs   = make([]gokzg4844.KZGProof, len(cellProofs))
+		commits  = make([]gokzg4844.KZGCommitment, 0, len(cellProofs))
+		indices  = make([]uint64, 0, len(cellProofs))
+		kzgcells = make([]*gokzg4844.Cell, 0, len(cellProofs))
+	)
+	// Copy over the cell proofs and cells
+	for i := range cellProofs {
+		proofs[i] = gokzg4844.KZGProof(cellProofs[i])
+		gc := gokzg4844.Cell(cells[i])
+		kzgcells = append(kzgcells, &gc)
+	}
+	if len(cellProofs)%len(commitments) != 0 {
+		return errors.New("wrong cell proofs and commitments length")
+	}
+	cellCounts := len(cellProofs) / len(commitments)
+	// Blow up the commitments to be the same length as the proofs
+	for _, commitment := range commitments {
+		for j := 0; j < cellCounts; j++ {
+			commits = append(commits, gokzg4844.KZGCommitment(commitment))
+		}
+	}
+	blobCounts := len(cellProofs) / len(cellIndices)
+	for j := 0; j < blobCounts; j++ {
+		indices = append(indices, cellIndices...)
+	}
+
+	return context.VerifyCellKZGProofBatch(commits, indices, kzgcells, proofs)
+}
+
+// gokzgComputeCells computes cells from blobs.
+func gokzgComputeCells(blobs []Blob) ([]Cell, error) {
+	gokzgIniter.Do(gokzgInit)
+	cells := make([]Cell, 0, gokzg4844.CellsPerExtBlob*len(blobs))
+
+	for i := range blobs {
+		cellsI, err := context.ComputeCells((*gokzg4844.Blob)(&blobs[i]), 2)
+		if err != nil {
+			return []Cell{}, err
+		}
+		for _, c := range cellsI {
+			if c != nil {
+				cells = append(cells, Cell(*c))
+			}
+		}
+	}
+	return cells, nil
+}
+
+// gokzgRecoverBlobs recovers blobs from cells and cell indices.
+func gokzgRecoverBlobs(cells []Cell, cellIndices []uint64) ([]Blob, error) {
+	gokzgIniter.Do(gokzgInit)
+
+	if len(cellIndices) == 0 || len(cells)%len(cellIndices) != 0 {
+		return []Blob{}, errors.New("cells with wrong length")
+	}
+
+	blobCount := len(cells) / len(cellIndices)
+	blobs := make([]Blob, 0, blobCount)
+
+	offset := 0
+	for range blobCount {
+		kzgcells := make([]*gokzg4844.Cell, 0, len(cellIndices))
+
+		for _, cell := range cells[offset : offset+len(cellIndices)] {
+			gc := gokzg4844.Cell(cell)
+			kzgcells = append(kzgcells, &gc)
+		}
+
+		extCells, err := context.RecoverCells(cellIndices, kzgcells, 2)
+		if err != nil {
+			return []Blob{}, err
+		}
+
+		var blob Blob
+		for i, cell := range extCells[:64] {
+			copy(blob[i*len(cell):], cell[:])
+		}
+		blobs = append(blobs, blob)
+
+		offset = offset + len(cellIndices)
+	}
+
+	return blobs, nil
+}

crypto/kzg4844/kzg4844_test.go

@@ -253,3 +253,119 @@ func benchmarkComputeCellProofs(b *testing.B, ckzg bool) {
 		}
 	}
 }
+
+func TestCKZGVerifyPartialCells(t *testing.T)  { testVerifyPartialCells(t, true) }
+func TestGoKZGVerifyPartialCells(t *testing.T) { testVerifyPartialCells(t, false) }
+
+func testVerifyPartialCells(t *testing.T, ckzg bool) {
+	if ckzg && !ckzgAvailable {
+		t.Skip("CKZG unavailable in this test build")
+	}
+	defer func(old bool) { useCKZG.Store(old) }(useCKZG.Load())
+	useCKZG.Store(ckzg)
+
+	const blobCount = 3
+	var blobs []*Blob
+	var commitments []Commitment
+	for range blobCount {
+		blob := randBlob()
+		commitment, err := BlobToCommitment(blob)
+		if err != nil {
+			t.Fatalf("failed to commit blob: %v", err)
+		}
+		blobs = append(blobs, blob)
+		commitments = append(commitments, commitment)
+	}
+
+	var (
+		partialCells  []Cell
+		partialProofs []Proof
+		commits       []Commitment
+		indices       []uint64
+	)
+
+	for bi, blob := range blobs {
+		proofs, err := ComputeCellProofs(blob)
+		if err != nil {
+			t.Fatalf("failed to compute cell proofs: %v", err)
+		}
+		cells, err := ComputeCells([]Blob{*blob})
+		if err != nil {
+			t.Fatalf("failed to compute cells: %v", err)
+		}
+		commits = append(commits, commitments[bi])
+
+		// sample 0, 31, 63, 95 cells
+		step := len(cells) / 4
+
+		indices = []uint64{0, uint64(step - 1), uint64(2*step - 1), uint64(3*step - 1)}
+		for _, idx := range indices {
+			partialCells = append(partialCells, cells[idx])
+			partialProofs = append(partialProofs, proofs[idx])
+		}
+	}
+	if err := VerifyCells(partialCells, commits, partialProofs, indices); err != nil {
+		t.Fatalf("failed to verify partial cell proofs: %v", err)
+	}
+}
+
+func TestCKZGRecoverBlob(t *testing.T)  { testRecoverBlob(t, true) }
+func TestGoKZGRecoverBlob(t *testing.T) { testRecoverBlob(t, false) }
+
+func testRecoverBlob(t *testing.T, ckzg bool) {
+	if ckzg && !ckzgAvailable {
+		t.Skip("CKZG unavailable in this test build")
+	}
+	defer func(old bool) { useCKZG.Store(old) }(useCKZG.Load())
+	useCKZG.Store(ckzg)
+
+	blobs := []Blob{}
+	blobs = append(blobs, *randBlob())
+	blobs = append(blobs, *randBlob())
+	blobs = append(blobs, *randBlob())
+
+	cells, err := ComputeCells(blobs)
+	if err != nil {
+		t.Fatalf("failed to compute cells: %v", err)
+	}
+	proofs := make([]Proof, 0)
+	commitments := make([]Commitment, len(blobs))
+	for i, blob := range blobs {
+		proof, err := ComputeCellProofs(&blob)
+		if err != nil {
+			t.Fatalf("failed to compute proof: %v", err)
+		}
+		proofs = append(proofs, proof...)
+
+		commitment, err := BlobToCommitment(&blob)
+		if err != nil {
+			t.Fatalf("failed to compute commitment: %v", err)
+		}
+		commitments[i] = commitment
+	}
+
+	var (
+		partialCells []Cell
+		indices      []uint64
+	)
+
+	for ci := 64; ci < 128; ci++ {
+		indices = append(indices, uint64(ci))
+	}
+
+	for i := 0; i < len(cells); i += 128 {
+		start := i + 64
+		end := i + 128
+		partialCells = append(partialCells, cells[start:end]...)
+	}
+
+	recoverBlobs, err := RecoverBlobs(partialCells, indices)
+
+	if err != nil {
+		t.Fatalf("failed to recover blob: %v", err)
+	}
+
+	if err := VerifyCellProofs(recoverBlobs, commitments, proofs); err != nil {
+		t.Fatalf("failed to verify recovered blob: %v", err)
+	}
+}

eth/backend.go

@@ -43,6 +43,7 @@ import (
 	"github.com/ethereum/go-ethereum/core/vm"
 	"github.com/ethereum/go-ethereum/eth/downloader"
 	"github.com/ethereum/go-ethereum/eth/ethconfig"
+	"github.com/ethereum/go-ethereum/eth/fetcher"
 	"github.com/ethereum/go-ethereum/eth/gasprice"
 	"github.com/ethereum/go-ethereum/eth/protocols/eth"
 	"github.com/ethereum/go-ethereum/eth/protocols/snap"
@@ -335,11 +336,13 @@ func New(stack *node.Node, config *ethconfig.Config) (*Ethereum, error) {
 		Database:       chainDb,
 		Chain:          eth.blockchain,
 		TxPool:         eth.txPool,
+		BlobPool:       eth.blobTxPool,
 		Network:        networkID,
 		Sync:           config.SyncMode,
 		BloomCache:     uint64(cacheLimit),
 		EventMux:       eth.eventMux,
 		RequiredBlocks: config.RequiredBlocks,
+		Custody:        *types.CustodyBitmapAll,
 	}); err != nil {
 		return nil, err
 	}
@@ -423,6 +426,7 @@ func (s *Ethereum) AccountManager() *accounts.Manager  { return s.accountManager
 func (s *Ethereum) BlockChain() *core.BlockChain       { return s.blockchain }
 func (s *Ethereum) TxPool() *txpool.TxPool             { return s.txPool }
 func (s *Ethereum) BlobTxPool() *blobpool.BlobPool     { return s.blobTxPool }
+func (s *Ethereum) BlobFetcher() *fetcher.BlobFetcher  { return s.handler.blobFetcher }
 func (s *Ethereum) Engine() consensus.Engine           { return s.engine }
 func (s *Ethereum) ChainDb() ethdb.Database            { return s.chainDb }
 func (s *Ethereum) IsListening() bool                  { return true } // Always listening

eth/catalyst/api.go

@@ -1163,6 +1163,11 @@ func (api *ConsensusAPI) getBodiesByRange(start, count hexutil.Uint64) ([]*engin
 	return bodies, nil
 }
 
+func (api *ConsensusAPI) BlobCustodyUpdatedV1(custodyColumns []uint64) {
+	bitmap := types.NewCustodyBitmap(custodyColumns)
+	api.eth.BlobFetcher().UpdateCustody(bitmap)
+}
+
 func getBody(block *types.Block) *engine.ExecutionPayloadBody {
 	if block == nil {
 		return nil

eth/catalyst/api_test.go

@@ -1911,7 +1911,12 @@ func newGetBlobEnv(t testing.TB, version byte) (*node.Node, *ConsensusAPI) {
 	tx1 := makeMultiBlobTx(&config, 0, 2, 0, key1, version) // blob[0, 2)
 	tx2 := makeMultiBlobTx(&config, 0, 2, 2, key2, version) // blob[2, 4)
 	tx3 := makeMultiBlobTx(&config, 0, 2, 4, key3, version) // blob[4, 6)
-	ethServ.TxPool().Add([]*types.Transaction{tx1, tx2, tx3}, true)
+	errs := ethServ.TxPool().Add([]*types.Transaction{tx1, tx2, tx3}, true)
+	for i, err := range errs {
+		if err != nil {
+			t.Logf("Add tx %d failed: %v", i, err)
+		}
+	}
 
 	api := newConsensusAPIWithoutHeartbeat(ethServ)
 	return n, api
@@ -2108,6 +2113,15 @@ func runGetBlobs(t testing.TB, getBlobs getBlobsFn, start, limit int, fillRandom
 		}
 	}
 	if !reflect.DeepEqual(result, expect) {
+		t.Logf("result len=%d, expect len=%d", len(result), len(expect))
+		if len(result) > 0 && result[0] != nil && len(expect) > 0 && expect[0] != nil {
+			t.Logf("result[0].Blob len=%d, expect[0].Blob len=%d", len(result[0].Blob), len(expect[0].Blob))
+			t.Logf("result[0].CellProofs len=%d, expect[0].CellProofs len=%d", len(result[0].CellProofs), len(expect[0].CellProofs))
+			t.Logf("result[0].Blob == expect[0].Blob: %v", reflect.DeepEqual(result[0].Blob, expect[0].Blob))
+			t.Logf("result[0].CellProofs == expect[0].CellProofs: %v", reflect.DeepEqual(result[0].CellProofs, expect[0].CellProofs))
+		} else {
+			t.Logf("result[0]=%v, expect[0]=%v", result, expect)
+		}
 		t.Fatalf("Unexpected result for case %s", name)
 	}
 }

eth/fetcher/blob_fetcher.go

@@ -0,0 +1,784 @@
+// Copyright 2026 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package fetcher
+
+import (
+	"math/rand"
+	"slices"
+	"sort"
+	"time"
+
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/common/mclock"
+	"github.com/ethereum/go-ethereum/core/types"
+	"github.com/ethereum/go-ethereum/crypto/kzg4844"
+)
+
+// todo remove partial / full
+
+type random interface {
+	Intn(n int) int
+}
+
+// BlobFetcher fetches blobs of new type-3 transactions with probability p,
+// and for the remaining (1-p) transactions, it performs availability checks.
+// For availability checks, it fetches cells from each blob in the transaction
+// according to the custody cell indices provided by the consensus client
+// connected to this execution client.
+
+var blobFetchTimeout = 5 * time.Second
+
+// todo tuning
+const (
+	availabilityThreshold         = 2
+	maxPayloadRetrievals          = 128
+	maxPayloadAnnounces           = 4096
+	MAX_CELLS_PER_PARTIAL_REQUEST = 8
+	blobAvailabilityTimeout       = 500 * time.Millisecond
+)
+
+type blobTxAnnounce struct {
+	origin string              // Identifier of the peer that sent the announcement
+	txs    []common.Hash       // Hashes of transactions announced
+	cells  types.CustodyBitmap // Custody information of transactions being announced
+}
+
+type cellRequest struct {
+	txs   []common.Hash        // Transactions that have been requested for their cells
+	cells *types.CustodyBitmap // Requested cell indices
+	time  mclock.AbsTime       // Timestamp when the request was made
+}
+
+type payloadDelivery struct {
+	origin     string        // Peer from which the payloads were delivered
+	txs        []common.Hash // Hashes of transactions that were delivered
+	cells      [][]kzg4844.Cell
+	cellBitmap *types.CustodyBitmap
+}
+
+type cellWithSeq struct {
+	seq   uint64
+	cells *types.CustodyBitmap
+}
+
+type fetchStatus struct {
+	fetching *types.CustodyBitmap // To avoid fetching cells which had already been fetched / currently being fetched
+	fetched  []uint64             // To sort cells
+	cells    []kzg4844.Cell
+}
+
+// BlobFetcher is responsible for managing type 3 transactions based on peer announcements.
+//
+// BlobFetcher manages three buffers:
+//   - Transactions not to be fetched are moved to "waitlist"
+//     if a payload(blob) seems to be possessed by D(threshold) other peers, request custody cells for that.
+//     Accept it when the cells are received. Otherwise, it is dropped.
+//   - Transactions queued to be fetched are moved to "announces"
+//     if a payload is received, it is added to the blob pool. Otherwise, the transaction is dropped.
+//   - Transactions to be fetched are moved to "fetching"
+//     if a payload/cell announcement is received during fetch, the peer is recorded as an alternate source.
+type BlobFetcher struct {
+	notify  chan *blobTxAnnounce
+	cleanup chan *payloadDelivery
+	drop    chan *txDrop
+	quit    chan struct{}
+	custody *types.CustodyBitmap
+
+	txSeq uint64 // To make transactions fetched in arrival order
+
+	full    map[common.Hash]struct{}
+	partial map[common.Hash]struct{}
+
+	// Buffer 1: Set of blob txs whose blob data is waiting for availability confirmation (not pull decision)
+	waitlist  map[common.Hash]map[string]struct{} // Peer set that announced blob availability
+	waittime  map[common.Hash]mclock.AbsTime      // Timestamp when added to waitlist
+	waitslots map[string]map[common.Hash]struct{} // Waiting announcements grouped by peer (DoS protection)
+	// waitSlots should also include announcements with partial cells
+
+	// Buffer 2: Transactions queued for fetching (pull decision + not pull decision)
+	// "announces" is shared with stage 3, for DoS protection
+	announces map[string]map[common.Hash]*cellWithSeq // Set of announced transactions, grouped by origin peer
+
+	// Buffer 2
+	// Stage 3: Transactions whose payloads/cells are currently being fetched (pull decision + not pull decision)
+	fetches  map[common.Hash]*fetchStatus // Hash -> Bitmap, in-flight transaction cells
+	requests map[string][]*cellRequest    // In-flight transaction retrievals
+	// todo simplify
+	alternates map[common.Hash]map[string]*types.CustodyBitmap // In-flight transaction alternate origins (in case the peer is dropped)
+
+	// Callbacks
+	validateCells func([]common.Hash, [][]kzg4844.Cell, *types.CustodyBitmap) []error
+	addPayload    func([]common.Hash, [][]kzg4844.Cell, *types.CustodyBitmap) []error
+	fetchPayloads func(string, []common.Hash, *types.CustodyBitmap) error
+	dropPeer      func(string)
+
+	step     chan struct{}    // Notification channel when the fetcher loop iterates
+	clock    mclock.Clock     // Monotonic clock or simulated clock for tests
+	realTime func() time.Time // Real system time or simulated time for tests
+	rand     random           // Randomizer
+}
+
+func NewBlobFetcher(
+	validateCells func([]common.Hash, [][]kzg4844.Cell, *types.CustodyBitmap) []error,
+	addPayload func([]common.Hash, [][]kzg4844.Cell, *types.CustodyBitmap) []error,
+	fetchPayloads func(string, []common.Hash, *types.CustodyBitmap) error, dropPeer func(string),
+	custody *types.CustodyBitmap, rand random) *BlobFetcher {
+	return &BlobFetcher{
+		notify:        make(chan *blobTxAnnounce),
+		cleanup:       make(chan *payloadDelivery),
+		drop:          make(chan *txDrop),
+		quit:          make(chan struct{}),
+		full:          make(map[common.Hash]struct{}),
+		partial:       make(map[common.Hash]struct{}),
+		waitlist:      make(map[common.Hash]map[string]struct{}),
+		waittime:      make(map[common.Hash]mclock.AbsTime),
+		waitslots:     make(map[string]map[common.Hash]struct{}),
+		announces:     make(map[string]map[common.Hash]*cellWithSeq),
+		fetches:       make(map[common.Hash]*fetchStatus),
+		requests:      make(map[string][]*cellRequest),
+		alternates:    make(map[common.Hash]map[string]*types.CustodyBitmap),
+		validateCells: validateCells,
+		addPayload:    addPayload,
+		fetchPayloads: fetchPayloads,
+		dropPeer:      dropPeer,
+		custody:       custody,
+		clock:         mclock.System{},
+		realTime:      time.Now,
+		rand:          rand,
+	}
+}
+
+// Notify is called when a Type 3 transaction is observed on the network. (TransactionPacket / NewPooledTransactionHashesPacket)
+func (f *BlobFetcher) Notify(peer string, txs []common.Hash, cells types.CustodyBitmap) error {
+	blobAnnounce := &blobTxAnnounce{origin: peer, txs: txs, cells: cells}
+	select {
+	case f.notify <- blobAnnounce:
+		return nil
+	case <-f.quit:
+		return errTerminated
+	}
+}
+
+// Enqueue inserts a batch of received blob payloads into the blob pool.
+// This is triggered by ethHandler upon receiving direct request responses.
+func (f *BlobFetcher) Enqueue(peer string, hashes []common.Hash, cells [][]kzg4844.Cell, cellBitmap types.CustodyBitmap) error {
+	blobReplyInMeter.Mark(int64(len(hashes)))
+
+	select {
+	case f.cleanup <- &payloadDelivery{origin: peer, txs: hashes, cells: cells, cellBitmap: &cellBitmap}:
+	case <-f.quit:
+		return errTerminated
+	}
+	return nil
+}
+
+func (f *BlobFetcher) Drop(peer string) error {
+	select {
+	case f.drop <- &txDrop{peer: peer}:
+		return nil
+	case <-f.quit:
+		return errTerminated
+	}
+}
+
+func (f *BlobFetcher) UpdateCustody(cells types.CustodyBitmap) {
+	f.custody = &cells
+}
+
+func (f *BlobFetcher) Start() {
+	go f.loop()
+}
+
+func (f *BlobFetcher) Stop() {
+	close(f.quit)
+}
+
+func (f *BlobFetcher) loop() {
+	var (
+		waitTimer      = new(mclock.Timer) // Timer for waitlist (availability)
+		waitTrigger    = make(chan struct{}, 1)
+		timeoutTimer   = new(mclock.Timer) // Timer for payload fetch request
+		timeoutTrigger = make(chan struct{}, 1)
+	)
+	for {
+		select {
+		case ann := <-f.notify:
+			// Drop part of the announcements if too many have accumulated from that peer
+			// This prevents a peer from dominating the queue with txs without responding to the request
+			// todo maxPayloadAnnounces -> according to the number of blobs
+			used := len(f.waitslots[ann.origin]) + len(f.announces[ann.origin])
+			if used >= maxPayloadAnnounces {
+				// Already full
+				break
+			}
+
+			want := used + len(ann.txs)
+			if want >= maxPayloadAnnounces {
+				// drop part of announcements
+				ann.txs = ann.txs[:maxPayloadAnnounces-used]
+			}
+
+			var (
+				idleWait   = len(f.waittime) == 0
+				_, oldPeer = f.announces[ann.origin]
+				nextSeq    = func() uint64 {
+					seq := f.txSeq
+					f.txSeq++
+					return seq
+				}
+				reschedule = make(map[string]struct{})
+			)
+			for _, hash := range ann.txs {
+				if oldPeer && f.announces[ann.origin][hash] != nil {
+					// Ignore already announced information
+					// We also have to prevent reannouncement by changing cells field.
+					// Considering cell custody transition is notified in advance of its finalization by consensus client,
+					// there is no reason to reannounce cells, and it has to be prevented.
+					continue
+				}
+				// Decide full or partial request
+				if _, ok := f.full[hash]; !ok {
+					if _, ok := f.partial[hash]; !ok {
+						// Not decided yet
+						var randomValue int
+						if f.rand == nil {
+							randomValue = rand.Intn(100)
+						} else {
+							randomValue = f.rand.Intn(100)
+						}
+						if randomValue < 15 {
+							f.full[hash] = struct{}{}
+						} else {
+							f.partial[hash] = struct{}{}
+							// Register for availability check
+							f.waitlist[hash] = make(map[string]struct{})
+							f.waittime[hash] = f.clock.Now()
+						}
+					}
+				}
+				if _, ok := f.full[hash]; ok {
+					// 1) Decided to send full request of the tx
+					if ann.cells != *types.CustodyBitmapAll {
+						continue
+					}
+					if f.announces[ann.origin] == nil {
+						f.announces[ann.origin] = make(map[common.Hash]*cellWithSeq)
+					}
+					f.announces[ann.origin][hash] = &cellWithSeq{
+						cells: types.CustodyBitmapData,
+						seq:   nextSeq(),
+					}
+					reschedule[ann.origin] = struct{}{}
+					continue
+				}
+				if _, ok := f.partial[hash]; ok {
+					// 2) Decided to send partial request of the tx
+					if f.waitlist[hash] != nil {
+						if ann.cells != *types.CustodyBitmapAll {
+							continue
+						}
+						// Transaction is at the stage of availability check
+						// Add the peer to the peer list with full availability (waitlist)
+						f.waitlist[hash][ann.origin] = struct{}{}
+						if waitslots := f.waitslots[ann.origin]; waitslots != nil {
+							waitslots[hash] = struct{}{}
+						} else {
+							f.waitslots[ann.origin] = map[common.Hash]struct{}{
+								hash: {},
+							}
+						}
+						if len(f.waitlist[hash]) >= availabilityThreshold {
+							for peer := range f.waitlist[hash] {
+								if f.announces[peer] == nil {
+									f.announces[peer] = make(map[common.Hash]*cellWithSeq)
+								}
+								f.announces[peer][hash] = &cellWithSeq{
+									cells: f.custody,
+									seq:   nextSeq(),
+								}
+								delete(f.waitslots[peer], hash)
+								if len(f.waitslots[peer]) == 0 {
+									delete(f.waitslots, peer)
+								}
+								reschedule[peer] = struct{}{}
+							}
+							delete(f.waitlist, hash)
+						}
+						continue
+					}
+					if ann.cells.Intersection(f.custody).OneCount() == 0 {
+						// No custody overlapping
+						continue
+					}
+
+					if f.announces[ann.origin] == nil {
+						f.announces[ann.origin] = make(map[common.Hash]*cellWithSeq)
+					}
+					f.announces[ann.origin][hash] = &cellWithSeq{
+						cells: ann.cells.Intersection(f.custody),
+						seq:   nextSeq(),
+					}
+					reschedule[ann.origin] = struct{}{}
+				}
+			}
+
+			// If a new item was added to the waitlist, schedule its timeout
+			if idleWait && len(f.waittime) > 0 {
+				f.rescheduleWait(waitTimer, waitTrigger)
+			}
+
+			// If this is a new peer and that peer sent transaction with payload flag,
+			// schedule transaction fetches from it
+			//todo
+			if !oldPeer && len(f.announces[ann.origin]) > 0 {
+				f.scheduleFetches(timeoutTimer, timeoutTrigger, reschedule)
+			}
+
+		case <-waitTrigger:
+			// At least one transaction's waiting time ran out, pop all expired ones
+			// and update the blobpool according to availability
+			// Availability failure case
+			for hash, instance := range f.waittime {
+				if time.Duration(f.clock.Now()-instance)+txGatherSlack > blobAvailabilityTimeout {
+					// Check if enough peers have announced availability
+					for peer := range f.waitlist[hash] {
+						delete(f.waitslots[peer], hash)
+						if len(f.waitslots[peer]) == 0 {
+							delete(f.waitslots, peer)
+						}
+					}
+					delete(f.waittime, hash)
+					delete(f.waitlist, hash)
+				}
+			}
+
+			// If transactions are still waiting for availability, reschedule the wait timer
+			if len(f.waittime) > 0 {
+				f.rescheduleWait(waitTimer, waitTrigger)
+			}
+
+		case <-timeoutTrigger:
+			// Clean up any expired retrievals and avoid re-requesting them from the
+			// same peer (either overloaded or malicious, useless in both cases).
+			// Update blobpool according to availability result.
+			for peer, requests := range f.requests {
+				newRequests := make([]*cellRequest, 0)
+				for _, req := range requests {
+					if time.Duration(f.clock.Now()-req.time)+txGatherSlack > blobFetchTimeout {
+						// Reschedule all timeout cells to alternate peers
+						for _, hash := range req.txs {
+							// Do not request the same tx from this peer
+							delete(f.announces[peer], hash)
+							delete(f.alternates[hash], peer)
+							// Allow other candidates to be requested these cells
+							f.fetches[hash].fetching = f.fetches[hash].fetching.Difference(req.cells)
+
+							// Drop cells if there is no alternate source to fetch cells from
+							if len(f.alternates[hash]) == 0 {
+								delete(f.alternates, hash)
+								delete(f.fetches, hash)
+							}
+						}
+						if len(f.announces[peer]) == 0 {
+							delete(f.announces, peer)
+						}
+					} else {
+						newRequests = append(newRequests, req)
+					}
+				}
+				f.requests[peer] = newRequests
+				if len(f.requests[peer]) == 0 {
+					delete(f.requests, peer)
+				}
+			}
+
+			// Schedule a new transaction retrieval
+			f.scheduleFetches(timeoutTimer, timeoutTrigger, nil)
+
+			// Trigger timeout for new schedule
+			f.rescheduleTimeout(timeoutTimer, timeoutTrigger)
+		case delivery := <-f.cleanup:
+			// Remove from announce
+			addedHashes := make([]common.Hash, 0)
+			addedCells := make([][]kzg4844.Cell, 0)
+
+			var requestId int
+			request := new(cellRequest)
+			for _, hash := range delivery.txs {
+				// Find the request
+				for i, req := range f.requests[delivery.origin] {
+					if slices.Contains(req.txs, hash) && *req.cells == *delivery.cellBitmap {
+						request = req
+						requestId = i
+						break
+					}
+				}
+				if request != nil {
+					break
+				}
+			}
+			if request == nil {
+				// peer sent cells not requested. ignore
+				break
+			}
+
+			for i, hash := range delivery.txs {
+				if !slices.Contains(request.txs, hash) {
+					// Unexpected hash, ignore
+					continue
+				}
+				// Update fetch status
+				f.fetches[hash].fetched = append(f.fetches[hash].fetched, delivery.cellBitmap.Indices()...)
+				f.fetches[hash].cells = append(f.fetches[hash].cells, delivery.cells[i]...)
+
+				// Update announces of this peer
+				delete(f.announces[delivery.origin], hash)
+				if len(f.announces[delivery.origin]) == 0 {
+					delete(f.announces, delivery.origin)
+				}
+				delete(f.alternates[hash], delivery.origin)
+				if len(f.alternates[hash]) == 0 {
+					delete(f.alternates, hash)
+				}
+
+				// Check whether the all required cells are fetched
+				completed := false
+				if _, ok := f.full[hash]; ok && len(f.fetches[hash].fetched) >= kzg4844.DataPerBlob {
+					completed = true
+				} else if _, ok := f.partial[hash]; ok {
+					fetched := make([]uint64, len(f.fetches[hash].fetched))
+					copy(fetched, f.fetches[hash].fetched)
+					slices.Sort(fetched)
+
+					custodyIndices := f.custody.Indices()
+
+					completed = slices.Equal(fetched, custodyIndices)
+				}
+
+				if completed {
+					addedHashes = append(addedHashes, hash)
+					fetchStatus := f.fetches[hash]
+					sort.Slice(fetchStatus.cells, func(i, j int) bool {
+						return fetchStatus.fetched[i] < fetchStatus.fetched[j]
+					})
+					addedCells = append(addedCells, fetchStatus.cells)
+
+					// remove announces from other peers
+					for peer, txset := range f.announces {
+						delete(txset, hash)
+						if len(txset) == 0 {
+							delete(f.announces, peer)
+						}
+					}
+					delete(f.alternates, hash)
+					delete(f.fetches, hash)
+				}
+			}
+			// Update mempool status for arrived hashes
+			if len(addedHashes) > 0 {
+				f.addPayload(addedHashes, addedCells, delivery.cellBitmap)
+			}
+
+			// Remove the request
+			f.requests[delivery.origin][requestId] = f.requests[delivery.origin][len(f.requests[delivery.origin])-1]
+			f.requests[delivery.origin] = f.requests[delivery.origin][:len(f.requests[delivery.origin])-1]
+			if len(f.requests[delivery.origin]) == 0 {
+				delete(f.requests, delivery.origin)
+			}
+
+			// Reschedule missing transactions in the request
+			// Anything not delivered should be re-scheduled (with or without
+			// this peer, depending on the response cutoff)
+			delivered := make(map[common.Hash]struct{})
+			for _, hash := range delivery.txs {
+				delivered[hash] = struct{}{}
+			}
+			cutoff := len(request.txs)
+			for i, hash := range request.txs {
+				if _, ok := delivered[hash]; ok {
+					cutoff = i
+					continue
+				}
+			}
+			// Reschedule missing hashes from alternates, not-fulfilled from alt+self
+			for i, hash := range request.txs {
+				if _, ok := delivered[hash]; !ok {
+					// Not delivered
+					if i < cutoff {
+						// Remove origin from candidate sources for partial responses
+						delete(f.alternates[hash], delivery.origin)
+						delete(f.announces[delivery.origin], hash)
+						if len(f.announces[delivery.origin]) == 0 {
+							delete(f.announces, delivery.origin)
+						}
+					}
+					// Mark cells deliverable by other peers
+					if f.fetches[hash] != nil {
+						f.fetches[hash].fetching = f.fetches[hash].fetching.Difference(delivery.cellBitmap)
+					}
+				}
+			}
+			// Something was delivered, try to reschedule requests
+			f.scheduleFetches(timeoutTimer, timeoutTrigger, nil) // Partial delivery may enable others to deliver too
+		case drop := <-f.drop:
+			// A peer was dropped, remove all traces of it
+			if _, ok := f.waitslots[drop.peer]; ok {
+				for hash := range f.waitslots[drop.peer] {
+					delete(f.waitlist[hash], drop.peer)
+					if len(f.waitlist[hash]) == 0 {
+						delete(f.waitlist, hash)
+						delete(f.waittime, hash)
+					}
+				}
+				delete(f.waitslots, drop.peer)
+				if len(f.waitlist) > 0 {
+					f.rescheduleWait(waitTimer, waitTrigger)
+				}
+			}
+			// Clean up general announcement tracking
+			if _, ok := f.announces[drop.peer]; ok {
+				for hash := range f.announces[drop.peer] {
+					delete(f.alternates[hash], drop.peer)
+					if len(f.alternates[hash]) == 0 {
+						delete(f.alternates, hash)
+					}
+				}
+				delete(f.announces, drop.peer)
+			}
+			delete(f.announces, drop.peer)
+
+			// Clean up any active requests
+			if request, ok := f.requests[drop.peer]; ok && len(request) != 0 {
+				for _, req := range request {
+					for _, hash := range req.txs {
+						// Undelivered hash, reschedule if there's an alternative origin available
+						f.fetches[hash].fetching = f.fetches[hash].fetching.Difference(req.cells)
+						delete(f.alternates[hash], drop.peer)
+						if len(f.alternates[hash]) == 0 {
+							delete(f.alternates, hash)
+							delete(f.fetches, hash)
+						}
+					}
+				}
+				delete(f.requests, drop.peer)
+				// If a request was cancelled, check if anything needs to be rescheduled
+				f.scheduleFetches(timeoutTimer, timeoutTrigger, nil)
+				f.rescheduleTimeout(timeoutTimer, timeoutTrigger)
+			}
+
+		case <-f.quit:
+			return
+		}
+		// Loop did something, ping the step notifier if needed (tests)
+		if f.step != nil {
+			f.step <- struct{}{}
+		}
+	}
+}
+
+func (f *BlobFetcher) rescheduleWait(timer *mclock.Timer, trigger chan struct{}) {
+	if *timer != nil {
+		(*timer).Stop()
+	}
+	now := f.clock.Now()
+
+	earliest := now
+	for _, instance := range f.waittime {
+		if earliest > instance {
+			earliest = instance
+			if txArriveTimeout-time.Duration(now-earliest) < txGatherSlack {
+				break
+			}
+		}
+	}
+	*timer = f.clock.AfterFunc(txArriveTimeout-time.Duration(now-earliest), func() {
+		trigger <- struct{}{}
+	})
+}
+
+// Exactly same as the one in TxFetcher
+func (f *BlobFetcher) rescheduleTimeout(timer *mclock.Timer, trigger chan struct{}) {
+	if *timer != nil {
+		(*timer).Stop()
+	}
+	now := f.clock.Now()
+
+	earliest := now
+	for _, requests := range f.requests {
+		for _, req := range requests {
+			// If this request already timed out, skip it altogether
+			if req.txs == nil {
+				continue
+			}
+			if earliest > req.time {
+				earliest = req.time
+				if blobFetchTimeout-time.Duration(now-earliest) < txGatherSlack {
+					break
+				}
+			}
+		}
+	}
+	*timer = f.clock.AfterFunc(blobFetchTimeout-time.Duration(now-earliest), func() {
+		trigger <- struct{}{}
+	})
+}
+func (f *BlobFetcher) scheduleFetches(timer *mclock.Timer, timeout chan struct{}, whitelist map[string]struct{}) {
+	// Gather the set of peers we want to retrieve from (default to all)
+	actives := whitelist
+	if actives == nil {
+		actives = make(map[string]struct{})
+		for peer := range f.announces {
+			actives[peer] = struct{}{}
+		}
+	}
+	if len(actives) == 0 {
+		return
+	}
+	// For each active peer, try to schedule some payload fetches
+	idle := len(f.requests) == 0
+
+	f.forEachPeer(actives, func(peer string) {
+		if len(f.announces[peer]) == 0 || len(f.requests[peer]) != 0 {
+			return // continue
+		}
+		var (
+			hashes    = make([]common.Hash, 0, maxTxRetrievals)
+			custodies = make([]*types.CustodyBitmap, 0, maxTxRetrievals)
+		)
+		f.forEachAnnounce(f.announces[peer], func(hash common.Hash, cells *types.CustodyBitmap) bool {
+			var difference *types.CustodyBitmap
+
+			if f.fetches[hash] == nil {
+				// tx is not being fetched
+				difference = cells
+			} else {
+				difference = cells.Difference(f.fetches[hash].fetching)
+			}
+
+			// Mark fetching for differences
+			if difference.OneCount() != 0 {
+				if f.fetches[hash] == nil {
+					f.fetches[hash] = &fetchStatus{
+						fetching: difference,
+						fetched:  make([]uint64, 0),
+						cells:    make([]kzg4844.Cell, 0),
+					}
+				} else {
+					f.fetches[hash].fetching = f.fetches[hash].fetching.Union(difference)
+				}
+				// Accumulate the hash and stop if the limit was reached
+				hashes = append(hashes, hash)
+				custodies = append(custodies, difference)
+			}
+
+			// Mark alternatives
+			if f.alternates[hash] == nil {
+				f.alternates[hash] = map[string]*types.CustodyBitmap{
+					peer: cells,
+				}
+			} else {
+				f.alternates[hash][peer] = cells
+			}
+
+			return len(hashes) < maxPayloadRetrievals
+		})
+		// If any hashes were allocated, request them from the peer
+		if len(hashes) > 0 {
+			// Group hashes by custody bitmap
+			requestByCustody := make(map[string]*cellRequest)
+
+			for i, hash := range hashes {
+				custody := custodies[i]
+
+				key := string(custody[:])
+
+				if _, ok := requestByCustody[key]; !ok {
+					requestByCustody[key] = &cellRequest{
+						txs:   []common.Hash{},
+						cells: custody,
+						time:  f.clock.Now(),
+					}
+				}
+				requestByCustody[key].txs = append(requestByCustody[key].txs, hash)
+			}
+			// construct request
+			var request []*cellRequest
+			for _, cr := range requestByCustody {
+				request = append(request, cr)
+			}
+			f.requests[peer] = request
+			go func(peer string, request []*cellRequest) {
+				for _, req := range request {
+					if err := f.fetchPayloads(peer, req.txs, req.cells); err != nil {
+						f.Drop(peer)
+						break
+					}
+				}
+			}(peer, request)
+		}
+	})
+	// If a new request was fired, schedule a timeout timer
+	if idle && len(f.requests) > 0 {
+		f.rescheduleTimeout(timer, timeout)
+	}
+}
+
+// forEachAnnounce loops over the given announcements in arrival order, invoking
+// the do function for each until it returns false. We enforce an arrival
+// ordering to minimize the chances of transaction nonce-gaps, which result in
+// transactions being rejected by the txpool.
+func (f *BlobFetcher) forEachAnnounce(announces map[common.Hash]*cellWithSeq, do func(hash common.Hash, cells *types.CustodyBitmap) bool) {
+	type announcement struct {
+		hash  common.Hash
+		cells *types.CustodyBitmap
+		seq   uint64
+	}
+	// Process announcements by their arrival order
+	list := make([]announcement, 0, len(announces))
+	for hash, entry := range announces {
+		list = append(list, announcement{hash: hash, cells: entry.cells, seq: entry.seq})
+	}
+	sort.Slice(list, func(i, j int) bool {
+		return list[i].seq < list[j].seq
+	})
+	for i := range list {
+		if !do(list[i].hash, list[i].cells) {
+			return
+		}
+	}
+}
+
+// forEachPeer does a range loop over a map of peers in production, but during
+// testing it does a deterministic sorted random to allow reproducing issues.
+func (f *BlobFetcher) forEachPeer(peers map[string]struct{}, do func(peer string)) {
+	// If we're running production(step == nil), use whatever Go's map gives us
+	if f.step == nil {
+		for peer := range peers {
+			do(peer)
+		}
+		return
+	}
+	// We're running the test suite, make iteration deterministic (sorted by peer id)
+	list := make([]string, 0, len(peers))
+	for peer := range peers {
+		list = append(list, peer)
+	}
+	sort.Strings(list)
+	for _, peer := range list {
+		do(peer)
+	}
+}

eth/fetcher/blob_fetcher_test.go

@@ -0,0 +1,999 @@
+// Copyright 2026 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package fetcher
+
+import (
+	"slices"
+	"testing"
+	"time"
+
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/common/mclock"
+	"github.com/ethereum/go-ethereum/core/types"
+	"github.com/ethereum/go-ethereum/crypto/kzg4844"
+)
+
+// makeTestBlobSidecar is a helper method to create random blob sidecar
+// with certain number of blobs.
+func makeTestCellSidecar(blobCount int) *types.BlobTxCellSidecar {
+	var (
+		blobs       []kzg4844.Blob
+		commitments []kzg4844.Commitment
+		proofs      []kzg4844.Proof
+	)
+
+	for i := 0; i < blobCount; i++ {
+		blob := &kzg4844.Blob{}
+		blob[0] = byte(i)
+		blobs = append(blobs, *blob)
+
+		commit, _ := kzg4844.BlobToCommitment(blob)
+		commitments = append(commitments, commit)
+
+		cellProofs, _ := kzg4844.ComputeCellProofs(blob)
+		proofs = append(proofs, cellProofs...)
+	}
+
+	sidecar, _ := types.NewBlobTxSidecar(types.BlobSidecarVersion1, blobs, commitments, proofs).ToBlobTxCellSidecar()
+
+	return sidecar
+}
+
+func selectCells(cells []kzg4844.Cell, custody *types.CustodyBitmap) []kzg4844.Cell {
+	custodyIndices := custody.Indices()
+	result := make([]kzg4844.Cell, 0)
+
+	for _, idx := range custodyIndices {
+		result = append(result, cells[idx])
+	}
+
+	return result
+}
+
+const (
+	testBlobAvailabilityTimeout = 500 * time.Millisecond
+	testBlobFetchTimeout        = 5 * time.Second
+)
+
+var (
+	testBlobTxHashes = []common.Hash{
+		{0x01}, {0x02}, {0x03}, {0x04}, {0x05}, {0x06}, {0x07}, {0x08},
+	}
+
+	testBlobSidecars = []*types.BlobTxCellSidecar{
+		makeTestCellSidecar(1),
+		makeTestCellSidecar(2),
+		makeTestCellSidecar(3),
+		makeTestCellSidecar(4),
+	}
+
+	custody = types.NewCustodyBitmap([]uint64{0, 1, 2, 3, 4, 5, 6, 7})
+
+	fullCustody      = *types.CustodyBitmapAll
+	halfCustody      = *types.CustodyBitmapData
+	frontCustody     = types.NewCustodyBitmap([]uint64{0, 1, 2, 3, 8, 9, 10, 11})
+	backCustody      = types.NewCustodyBitmap([]uint64{4, 5, 6, 7, 8, 9, 10, 11})
+	differentCustody = types.NewCustodyBitmap([]uint64{8, 9, 10, 11, 12, 13, 14, 15})
+)
+
+type doBlobNotify struct {
+	peer    string
+	hashes  []common.Hash
+	custody types.CustodyBitmap
+}
+
+type doBlobEnqueue struct {
+	peer    string
+	hashes  []common.Hash
+	cells   [][]kzg4844.Cell
+	custody types.CustodyBitmap
+}
+
+type blobDoFunc func(*BlobFetcher)
+
+type isWaitingAvailability map[common.Hash]map[string]struct{}
+
+type isDecidedFull map[common.Hash]struct{}
+type isDecidedPartial map[common.Hash]struct{}
+
+type blobAnnounce struct {
+	hash    common.Hash
+	custody types.CustodyBitmap
+}
+
+type isBlobScheduled struct {
+	announces map[string][]blobAnnounce // announces에 있는 것들 (peer -> hash+custody)
+	fetching  map[string][]blobAnnounce // requests에 있는 것들 (peer -> hash+custody)
+}
+
+type isCompleted []common.Hash
+type isDropped []string
+
+type isFetching struct {
+	hashes map[common.Hash]fetchInfo
+}
+
+type fetchInfo struct {
+	fetching *types.CustodyBitmap
+	fetched  []uint64
+}
+
+type blobFetcherTest struct {
+	init  func() *BlobFetcher
+	steps []interface{}
+}
+
+type mockRand struct {
+	value int
+}
+
+func (r *mockRand) Intn(n int) int {
+	return r.value
+}
+
+// TestBlobFetcherFullSchedule tests scheduling full payload decision
+// Blob should be fetched immediately when its availability is announced
+// by idle peer, if the client decided to pull the full payload
+// Additional announcements should be recorded as alternates during the fetch
+func TestBlobFetcherFullFetch(t *testing.T) {
+	testBlobFetcher(t, blobFetcherTest{
+		init: func() *BlobFetcher {
+			return NewBlobFetcher(
+				func(txs []common.Hash, _ [][]kzg4844.Cell, _ *types.CustodyBitmap) []error {
+					return make([]error, len(txs))
+				},
+				func(txs []common.Hash, _ [][]kzg4844.Cell, _ *types.CustodyBitmap) []error {
+					return make([]error, len(txs))
+				},
+				func(string, []common.Hash, *types.CustodyBitmap) error { return nil },
+				func(string) {},
+				&custody,
+				&mockRand{value: 5}, // to force full requests (5 < 15)
+			)
+		},
+		steps: []interface{}{
+			// A announced full custody blob (should make full decision & start fetching)
+			doBlobNotify{peer: "A", hashes: []common.Hash{testBlobTxHashes[0]}, custody: fullCustody},
+			isDecidedFull{testBlobTxHashes[0]: struct{}{}},
+			isBlobScheduled{
+				announces: map[string][]blobAnnounce{
+					"A": {{hash: testBlobTxHashes[0], custody: halfCustody}},
+				},
+				fetching: map[string][]blobAnnounce{
+					"A": {{hash: testBlobTxHashes[0], custody: halfCustody}},
+				},
+			},
+			isFetching{
+				hashes: map[common.Hash]fetchInfo{
+					testBlobTxHashes[0]: {
+						fetching: &halfCustody,
+						fetched:  []uint64{},
+					},
+				},
+			},
+
+			// Same hash announced by another peer(B) -> should be added to alternatives
+			doBlobNotify{peer: "B", hashes: []common.Hash{testBlobTxHashes[0]}, custody: fullCustody},
+			isBlobScheduled{
+				announces: map[string][]blobAnnounce{
+					"A": {{hash: testBlobTxHashes[0], custody: halfCustody}},
+					"B": {{hash: testBlobTxHashes[0], custody: halfCustody}},
+				},
+				fetching: map[string][]blobAnnounce{
+					"A": {{hash: testBlobTxHashes[0], custody: halfCustody}},
+				},
+			},
+
+			// Announce partial custody by C -> should be ignored
+			doBlobNotify{peer: "C", hashes: []common.Hash{testBlobTxHashes[1]}, custody: custody},
+			isBlobScheduled{
+				announces: map[string][]blobAnnounce{
+					"A": {{hash: testBlobTxHashes[0], custody: halfCustody}},
+					"B": {{hash: testBlobTxHashes[0], custody: halfCustody}},
+				},
+				fetching: map[string][]blobAnnounce{
+					"A": {{hash: testBlobTxHashes[0], custody: halfCustody}},
+				},
+			},
+
+			// Additional hashes announced by A -> should not be fetched
+			doBlobNotify{peer: "A", hashes: []common.Hash{testBlobTxHashes[1]}, custody: fullCustody},
+			isBlobScheduled{
+				announces: map[string][]blobAnnounce{
+					"A": {{hash: testBlobTxHashes[0], custody: halfCustody}, {hash: testBlobTxHashes[1], custody: halfCustody}},
+					"B": {{hash: testBlobTxHashes[0], custody: halfCustody}},
+				},
+				fetching: map[string][]blobAnnounce{
+					"A": {{hash: testBlobTxHashes[0], custody: halfCustody}},
+				},
+			},
+
+			// Announce of multiple transactions
+			doBlobNotify{peer: "D", hashes: []common.Hash{testBlobTxHashes[2], testBlobTxHashes[3]}, custody: fullCustody},
+			isBlobScheduled{
+				announces: map[string][]blobAnnounce{
+					"A": {{hash: testBlobTxHashes[0], custody: halfCustody}, {hash: testBlobTxHashes[1], custody: halfCustody}},
+					"B": {{hash: testBlobTxHashes[0], custody: halfCustody}},
+					"D": {{hash: testBlobTxHashes[2], custody: halfCustody}, {hash: testBlobTxHashes[3], custody: halfCustody}},
+				},
+				fetching: map[string][]blobAnnounce{
+					"A": {{hash: testBlobTxHashes[0], custody: halfCustody}},
+					"D": {{hash: testBlobTxHashes[2], custody: halfCustody}, {hash: testBlobTxHashes[3], custody: halfCustody}},
+				},
+			},
+		},
+	})
+}
+
+// TestBlobFetcherPartialFetching tests partial request decision and availability check flow
+func TestBlobFetcherPartialFetch(t *testing.T) {
+	testBlobFetcher(t, blobFetcherTest{
+		init: func() *BlobFetcher {
+			return NewBlobFetcher(
+				func(txs []common.Hash, _ [][]kzg4844.Cell, _ *types.CustodyBitmap) []error {
+					return make([]error, len(txs))
+				},
+				func(txs []common.Hash, _ [][]kzg4844.Cell, _ *types.CustodyBitmap) []error {
+					return make([]error, len(txs))
+				},
+				func(string, []common.Hash, *types.CustodyBitmap) error { return nil },
+				func(string) {},
+				&custody,
+				&mockRand{value: 20}, // Force partial requests (20 >= 15)
+			)
+		},
+		steps: []interface{}{
+			// First full announce for tx 0, 1 -> should make partial decision and go to waitlist
+			doBlobNotify{peer: "A", hashes: []common.Hash{testBlobTxHashes[0], testBlobTxHashes[1]}, custody: fullCustody},
+			isDecidedPartial{testBlobTxHashes[0]: struct{}{}, testBlobTxHashes[1]: struct{}{}},
+			isWaitingAvailability{testBlobTxHashes[0]: map[string]struct{}{"A": {}}, testBlobTxHashes[1]: map[string]struct{}{"A": {}}},
+			isBlobScheduled{announces: nil, fetching: nil},
+
+			// Partial announce for tx 0 (waitlist) -> should be dropped
+			doBlobNotify{peer: "B", hashes: []common.Hash{testBlobTxHashes[0]}, custody: custody},
+			isWaitingAvailability{testBlobTxHashes[0]: map[string]struct{}{"A": {}}, testBlobTxHashes[1]: map[string]struct{}{"A": {}}},
+			isBlobScheduled{announces: nil, fetching: nil},
+
+			// Second full announce for tx 0 -> should make tx 0 available & fetched
+			doBlobNotify{peer: "C", hashes: []common.Hash{testBlobTxHashes[0]}, custody: fullCustody},
+			isWaitingAvailability{testBlobTxHashes[1]: map[string]struct{}{"A": {}}},
+			isBlobScheduled{
+				announces: map[string][]blobAnnounce{
+					"A": {{hash: testBlobTxHashes[0], custody: custody}},
+					"C": {{hash: testBlobTxHashes[0], custody: custody}},
+				},
+				fetching: map[string][]blobAnnounce{
+					"A": {{hash: testBlobTxHashes[0], custody: custody}},
+				},
+			},
+			isFetching{
+				hashes: map[common.Hash]fetchInfo{
+					testBlobTxHashes[0]: {
+						fetching: &custody,
+						fetched:  []uint64{},
+					},
+				},
+			},
+
+			// Partial announce for tx 0, overlapped custody -> overlapping part should be accepted
+			doBlobNotify{peer: "B", hashes: []common.Hash{testBlobTxHashes[0]}, custody: frontCustody},
+			isBlobScheduled{
+				announces: map[string][]blobAnnounce{
+					"A": {{hash: testBlobTxHashes[0], custody: custody}},
+					"B": {{hash: testBlobTxHashes[0], custody: *frontCustody.Intersection(&custody)}},
+					"C": {{hash: testBlobTxHashes[0], custody: custody}},
+				},
+				fetching: map[string][]blobAnnounce{
+					"A": {{hash: testBlobTxHashes[0], custody: custody}},
+				},
+			},
+
+			// Partial announce for tx 0, with additional custody -> don't update
+			doBlobNotify{peer: "B", hashes: []common.Hash{testBlobTxHashes[0]}, custody: custody},
+			isBlobScheduled{
+				announces: map[string][]blobAnnounce{
+					"A": {{hash: testBlobTxHashes[0], custody: custody}},
+					"B": {{hash: testBlobTxHashes[0], custody: *frontCustody.Intersection(&custody)}},
+					"C": {{hash: testBlobTxHashes[0], custody: custody}},
+				},
+				fetching: map[string][]blobAnnounce{
+					"A": {{hash: testBlobTxHashes[0], custody: custody}},
+				},
+			},
+
+			// Partial announce for tx 0, without any overlapped custody -> should be dropped
+			doBlobNotify{peer: "D", hashes: []common.Hash{testBlobTxHashes[0]}, custody: differentCustody},
+			isBlobScheduled{
+				announces: map[string][]blobAnnounce{
+					"A": {{hash: testBlobTxHashes[0], custody: custody}},
+					"B": {{hash: testBlobTxHashes[0], custody: *frontCustody.Intersection(&custody)}},
+					"C": {{hash: testBlobTxHashes[0], custody: custody}},
+				},
+				fetching: map[string][]blobAnnounce{
+					"A": {{hash: testBlobTxHashes[0], custody: custody}},
+				},
+			},
+		},
+	})
+}
+
+// todo wait timeout
+// todo drop
+
+// TestBlobFetcherFullDelivery tests cell delivery and fetch completion logic (full fetch)
+func TestBlobFetcherFullDelivery(t *testing.T) {
+	testBlobFetcher(t, blobFetcherTest{
+		init: func() *BlobFetcher {
+			return NewBlobFetcher(
+				func(txs []common.Hash, _ [][]kzg4844.Cell, _ *types.CustodyBitmap) []error {
+					return make([]error, len(txs))
+				},
+				func(txs []common.Hash, _ [][]kzg4844.Cell, _ *types.CustodyBitmap) []error {
+					return make([]error, len(txs))
+				},
+				func(string, []common.Hash, *types.CustodyBitmap) error { return nil },
+				func(string) {},
+				&custody,
+				&mockRand{value: 5}, // Force full requests for simplicity
+			)
+		},
+		steps: []interface{}{
+			// Full announce by two peers (A, B) -> schedule fetch
+			doBlobNotify{peer: "A", hashes: []common.Hash{testBlobTxHashes[0]}, custody: fullCustody},
+			doBlobNotify{peer: "B", hashes: []common.Hash{testBlobTxHashes[0]}, custody: fullCustody},
+			isBlobScheduled{
+				announces: map[string][]blobAnnounce{
+					"A": {{hash: testBlobTxHashes[0], custody: halfCustody}},
+					"B": {{hash: testBlobTxHashes[0], custody: halfCustody}},
+				},
+				fetching: map[string][]blobAnnounce{
+					"A": {{hash: testBlobTxHashes[0], custody: halfCustody}},
+				},
+			},
+			isFetching{
+				hashes: map[common.Hash]fetchInfo{
+					testBlobTxHashes[0]: {
+						fetching: &halfCustody,
+						fetched:  []uint64{},
+					},
+				},
+			},
+
+			// All alternates should be clean up on delivery
+			doBlobEnqueue{peer: "A", hashes: []common.Hash{testBlobTxHashes[0]}, cells: [][]kzg4844.Cell{selectCells(testBlobSidecars[0].Cells, &halfCustody)}, custody: halfCustody},
+			isBlobScheduled{announces: nil, fetching: nil},
+			isFetching{hashes: nil}, // fetches should be empty after completion
+			isCompleted{testBlobTxHashes[0]},
+		},
+	})
+}
+
+// TestBlobFetcherPartialDelivery tests cell delivery and fetch completion logic (partial fetch)
+func TestBlobFetcherPartialDelivery(t *testing.T) {
+	testBlobFetcher(t, blobFetcherTest{
+		init: func() *BlobFetcher {
+			return NewBlobFetcher(
+				func(txs []common.Hash, _ [][]kzg4844.Cell, _ *types.CustodyBitmap) []error {
+					return make([]error, len(txs))
+				},
+				func(txs []common.Hash, _ [][]kzg4844.Cell, _ *types.CustodyBitmap) []error {
+					return make([]error, len(txs))
+				},
+				func(string, []common.Hash, *types.CustodyBitmap) error { return nil },
+				func(string) {},
+				&custody,
+				&mockRand{value: 20},
+			)
+		},
+		steps: []interface{}{
+			// Full announce by two peers (A, B) -> schedule fetch
+			doBlobNotify{peer: "A", hashes: []common.Hash{testBlobTxHashes[0]}, custody: fullCustody},
+			doBlobNotify{peer: "B", hashes: []common.Hash{testBlobTxHashes[0]}, custody: fullCustody},
+			isWaitingAvailability(nil),
+			isBlobScheduled{
+				announces: map[string][]blobAnnounce{
+					"A": {{hash: testBlobTxHashes[0], custody: custody}},
+					"B": {{hash: testBlobTxHashes[0], custody: custody}},
+				},
+				fetching: map[string][]blobAnnounce{
+					"A": {{hash: testBlobTxHashes[0], custody: custody}},
+				},
+			},
+			isFetching{
+				hashes: map[common.Hash]fetchInfo{
+					testBlobTxHashes[0]: {
+						fetching: &custody,
+						fetched:  []uint64{},
+					},
+				},
+			},
+
+			// Partial announce by C, D -> alternates
+			doBlobNotify{peer: "C", hashes: []common.Hash{testBlobTxHashes[0]}, custody: frontCustody},
+			doBlobNotify{peer: "D", hashes: []common.Hash{testBlobTxHashes[0]}, custody: backCustody},
+			isBlobScheduled{
+				announces: map[string][]blobAnnounce{
+					"A": {{hash: testBlobTxHashes[0], custody: custody}},
+					"B": {{hash: testBlobTxHashes[0], custody: custody}},
+					"C": {{hash: testBlobTxHashes[0], custody: *frontCustody.Intersection(&custody)}},
+					"D": {{hash: testBlobTxHashes[0], custody: *backCustody.Intersection(&custody)}},
+				},
+				fetching: map[string][]blobAnnounce{
+					"A": {{hash: testBlobTxHashes[0], custody: custody}},
+				},
+			},
+
+			// Drop A, B -> schedule fetch from C, D
+			doDrop("A"),
+			doDrop("B"),
+			isBlobScheduled{
+				announces: map[string][]blobAnnounce{
+					"C": {{hash: testBlobTxHashes[0], custody: *frontCustody.Intersection(&custody)}},
+					"D": {{hash: testBlobTxHashes[0], custody: *backCustody.Intersection(&custody)}},
+				},
+				fetching: map[string][]blobAnnounce{
+					"C": {{hash: testBlobTxHashes[0], custody: *frontCustody.Intersection(&custody)}},
+					"D": {{hash: testBlobTxHashes[0], custody: *backCustody.Intersection(&custody)}},
+				},
+			},
+
+			// Delivery from C -> wait for D
+			doBlobEnqueue{
+				peer:    "C",
+				hashes:  []common.Hash{testBlobTxHashes[0]},
+				cells:   [][]kzg4844.Cell{selectCells(testBlobSidecars[0].Cells, frontCustody.Intersection(&custody))},
+				custody: *frontCustody.Intersection(&custody),
+			},
+			isBlobScheduled{
+				announces: map[string][]blobAnnounce{
+					"D": {{hash: testBlobTxHashes[0], custody: *backCustody.Intersection(&custody)}},
+				},
+				fetching: map[string][]blobAnnounce{
+					"D": {{hash: testBlobTxHashes[0], custody: *backCustody.Intersection(&custody)}},
+				},
+			},
+			isFetching{
+				hashes: map[common.Hash]fetchInfo{
+					testBlobTxHashes[0]: {
+						fetching: &custody,
+						fetched:  frontCustody.Intersection(&custody).Indices(),
+					},
+				},
+			},
+
+			// Announce already delivered cells + fetching cells -> leave fetching cells only
+			doBlobNotify{peer: "E", hashes: []common.Hash{testBlobTxHashes[0]}, custody: custody},
+			isBlobScheduled{
+				announces: map[string][]blobAnnounce{
+					"D": {{hash: testBlobTxHashes[0], custody: *backCustody.Intersection(&custody)}},
+					"E": {{hash: testBlobTxHashes[0], custody: custody}},
+				},
+				fetching: map[string][]blobAnnounce{
+					"D": {{hash: testBlobTxHashes[0], custody: *backCustody.Intersection(&custody)}},
+				},
+			},
+
+			// Not delivered -> reschedule to E
+			doWait{time: blobFetchTimeout, step: true},
+			isBlobScheduled{
+				announces: map[string][]blobAnnounce{
+					"E": {{hash: testBlobTxHashes[0], custody: custody}},
+				},
+				fetching: map[string][]blobAnnounce{
+					"E": {{hash: testBlobTxHashes[0], custody: *backCustody.Intersection(&custody)}},
+				},
+			},
+			isFetching{
+				hashes: map[common.Hash]fetchInfo{
+					testBlobTxHashes[0]: {
+						fetching: &custody,
+						fetched:  frontCustody.Intersection(&custody).Indices(),
+					},
+				},
+			},
+			// Delivery from E -> complete
+			doWait{time: blobFetchTimeout / 2, step: true},
+			doBlobEnqueue{
+				peer:    "E",
+				hashes:  []common.Hash{testBlobTxHashes[0]},
+				cells:   [][]kzg4844.Cell{selectCells(testBlobSidecars[0].Cells, backCustody.Intersection(&custody))},
+				custody: *backCustody.Intersection(&custody),
+			},
+			isCompleted{testBlobTxHashes[0]},
+		},
+	})
+}
+
+// TestBlobFetcherAvailabilityTimeout tests availability timeout for partial requests
+func TestBlobFetcherAvailabilityTimeout(t *testing.T) {
+	testBlobFetcher(t, blobFetcherTest{
+		init: func() *BlobFetcher {
+			return NewBlobFetcher(
+				func(txs []common.Hash, _ [][]kzg4844.Cell, _ *types.CustodyBitmap) []error {
+					return make([]error, len(txs))
+				},
+				func(txs []common.Hash, _ [][]kzg4844.Cell, _ *types.CustodyBitmap) []error {
+					return make([]error, len(txs))
+				},
+				func(string, []common.Hash, *types.CustodyBitmap) error { return nil },
+				func(string) {},
+				&custody,
+				&mockRand{value: 20},
+			)
+		},
+		steps: []interface{}{
+			// First full announce for tx 0 -> should make partial decision and go to waitlist
+			doBlobNotify{peer: "A", hashes: []common.Hash{testBlobTxHashes[0]}, custody: fullCustody},
+			isDecidedPartial{testBlobTxHashes[0]: struct{}{}},
+			isWaitingAvailability{testBlobTxHashes[0]: map[string]struct{}{"A": {}}},
+			isBlobScheduled{announces: nil, fetching: nil},
+
+			// Run clock for timeout
+			doWait{time: testBlobAvailabilityTimeout, step: true},
+
+			// After timeout, waitlist should be empty
+			isWaitingAvailability{},
+			isBlobScheduled{announces: nil, fetching: nil},
+		},
+	})
+}
+
+// TestBlobFetcherPeerDrop tests peer drop scenarios
+func TestBlobFetcherPeerDrop(t *testing.T) {
+	testBlobFetcher(t, blobFetcherTest{
+		init: func() *BlobFetcher {
+			return NewBlobFetcher(
+				func(txs []common.Hash, _ [][]kzg4844.Cell, _ *types.CustodyBitmap) []error {
+					return make([]error, len(txs))
+				},
+				func(txs []common.Hash, _ [][]kzg4844.Cell, _ *types.CustodyBitmap) []error {
+					return make([]error, len(txs))
+				},
+				func(string, []common.Hash, *types.CustodyBitmap) error { return nil },
+				func(string) {},
+				&custody,
+				&mockRand{value: 5},
+			)
+		},
+		steps: []interface{}{
+			// Full announce by peer A -> should schedule fetch
+			doBlobNotify{peer: "A", hashes: []common.Hash{testBlobTxHashes[0]}, custody: fullCustody},
+			isDecidedFull{testBlobTxHashes[0]: struct{}{}},
+			isBlobScheduled{
+				announces: map[string][]blobAnnounce{
+					"A": {{hash: testBlobTxHashes[0], custody: halfCustody}},
+				},
+				fetching: map[string][]blobAnnounce{
+					"A": {{hash: testBlobTxHashes[0], custody: halfCustody}},
+				},
+			},
+			isFetching{
+				hashes: map[common.Hash]fetchInfo{
+					testBlobTxHashes[0]: {
+						fetching: &halfCustody,
+						fetched:  []uint64{},
+					},
+				},
+			},
+
+			// Another peer B announces same hash -> should be added to alternates
+			doBlobNotify{peer: "B", hashes: []common.Hash{testBlobTxHashes[0]}, custody: fullCustody},
+			isBlobScheduled{
+				announces: map[string][]blobAnnounce{
+					"A": {{hash: testBlobTxHashes[0], custody: halfCustody}},
+					"B": {{hash: testBlobTxHashes[0], custody: halfCustody}},
+				},
+				fetching: map[string][]blobAnnounce{
+					"A": {{hash: testBlobTxHashes[0], custody: halfCustody}},
+				},
+			},
+
+			// Drop peer A -> should reschedule fetch to peer B
+			doDrop("A"),
+			isBlobScheduled{
+				announces: map[string][]blobAnnounce{
+					"B": {{hash: testBlobTxHashes[0], custody: halfCustody}},
+				},
+				fetching: map[string][]blobAnnounce{
+					"B": {{hash: testBlobTxHashes[0], custody: halfCustody}},
+				},
+			},
+			isFetching{
+				hashes: map[common.Hash]fetchInfo{
+					testBlobTxHashes[0]: {
+						fetching: &halfCustody,
+						fetched:  []uint64{},
+					},
+				},
+			},
+
+			// Drop peer B -> should drop the transaction, remove all traces
+			doDrop("B"),
+			isBlobScheduled{announces: nil, fetching: nil},
+			isFetching{hashes: nil},
+		},
+	})
+}
+
+// TestBlobFetcherFetchTimeout tests fetch timeout and rescheduling, full request case
+func TestBlobFetcherFetchTimeout(t *testing.T) {
+	testBlobFetcher(t, blobFetcherTest{
+		init: func() *BlobFetcher {
+			return NewBlobFetcher(
+				func(txs []common.Hash, _ [][]kzg4844.Cell, _ *types.CustodyBitmap) []error {
+					return make([]error, len(txs))
+				},
+				func(txs []common.Hash, _ [][]kzg4844.Cell, _ *types.CustodyBitmap) []error {
+					return make([]error, len(txs))
+				},
+				func(string, []common.Hash, *types.CustodyBitmap) error { return nil },
+				func(string) {},
+				&custody,
+				&mockRand{value: 5},
+			)
+		},
+		steps: []interface{}{
+			// Full announce by peer A -> schedule fetch
+			doBlobNotify{peer: "A", hashes: []common.Hash{testBlobTxHashes[0]}, custody: fullCustody},
+			isDecidedFull{testBlobTxHashes[0]: struct{}{}},
+			isBlobScheduled{
+				announces: map[string][]blobAnnounce{
+					"A": {{hash: testBlobTxHashes[0], custody: halfCustody}},
+				},
+				fetching: map[string][]blobAnnounce{
+					"A": {{hash: testBlobTxHashes[0], custody: halfCustody}},
+				},
+			},
+			isFetching{
+				hashes: map[common.Hash]fetchInfo{
+					testBlobTxHashes[0]: {
+						fetching: &halfCustody,
+						fetched:  []uint64{},
+					},
+				},
+			},
+
+			// Another peer announces same hash -> should be added to alternates
+			doBlobNotify{peer: "B", hashes: []common.Hash{testBlobTxHashes[0]}, custody: fullCustody},
+			isBlobScheduled{
+				announces: map[string][]blobAnnounce{
+					"A": {{hash: testBlobTxHashes[0], custody: halfCustody}},
+					"B": {{hash: testBlobTxHashes[0], custody: halfCustody}},
+				},
+				fetching: map[string][]blobAnnounce{
+					"A": {{hash: testBlobTxHashes[0], custody: halfCustody}},
+				},
+			},
+
+			// Wait for fetch timeout -> should reschedule to peer B
+			doWait{time: testBlobFetchTimeout, step: true},
+			isBlobScheduled{
+				announces: map[string][]blobAnnounce{
+					"B": {{hash: testBlobTxHashes[0], custody: halfCustody}},
+				},
+				fetching: map[string][]blobAnnounce{
+					"B": {{hash: testBlobTxHashes[0], custody: halfCustody}},
+				},
+			},
+			isFetching{
+				hashes: map[common.Hash]fetchInfo{
+					testBlobTxHashes[0]: {
+						fetching: &halfCustody,
+						fetched:  []uint64{},
+					},
+				},
+			},
+
+			// Wait for timeout -> should drop transaction
+			doWait{time: testBlobFetchTimeout, step: true},
+			isBlobScheduled{announces: nil, fetching: nil},
+			isFetching{hashes: nil},
+		},
+	})
+}
+
+// testBlobFetcher is the generic test runner for blob fetcher tests
+func testBlobFetcher(t *testing.T, tt blobFetcherTest) {
+	clock := new(mclock.Simulated)
+	wait := make(chan struct{})
+
+	// Create a fetcher and boot it up
+	fetcher := tt.init()
+	fetcher.clock = clock
+	fetcher.step = wait
+
+	fetcher.Start()
+	defer fetcher.Stop()
+
+	defer func() {
+		for {
+			select {
+			case <-wait:
+			default:
+				return
+			}
+		}
+	}()
+
+	// Iterate through all the test steps and execute them
+	for i, step := range tt.steps {
+		// Clear the channel if anything is left over
+		for len(wait) > 0 {
+			<-wait
+		}
+		// Process the next step of the test
+		switch step := step.(type) {
+		case doBlobNotify:
+			if err := fetcher.Notify(step.peer, step.hashes, step.custody); err != nil {
+				t.Errorf("step %d: failed to notify fetcher: %v", i, err)
+				return
+			}
+			<-wait
+
+		case doBlobEnqueue:
+			if err := fetcher.Enqueue(step.peer, step.hashes, step.cells, step.custody); err != nil {
+				t.Errorf("step %d: failed to enqueue blobs: %v", i, err)
+				return
+			}
+			<-wait
+
+		case blobDoFunc:
+			step(fetcher)
+
+		case isWaitingAvailability:
+			// Check expected hashes and peers are present
+			for hash, peers := range step {
+				if waitPeers, ok := fetcher.waitlist[hash]; !ok {
+					t.Errorf("step %d: hash %x not in waitlist", i, hash)
+					return
+				} else {
+					// Check expected peers are present
+					for peer := range peers {
+						if _, ok := waitPeers[peer]; !ok {
+							t.Errorf("step %d: peer %s not waiting for hash %x", i, peer, hash)
+							return
+						}
+					}
+					// Check no unexpected peers are present
+					for peer := range waitPeers {
+						if _, ok := peers[peer]; !ok {
+							t.Errorf("step %d: unexpected peer %s waiting for hash %x", i, peer, hash)
+							return
+						}
+					}
+				}
+			}
+			// Check no unexpected hashes in waitlist
+			for hash := range fetcher.waitlist {
+				if _, ok := step[hash]; !ok {
+					t.Errorf("step %d: unexpected hash %x in waitlist", i, hash)
+					return
+				}
+			}
+
+		case isDecidedFull:
+			for hash := range step {
+				if _, ok := fetcher.full[hash]; !ok {
+					t.Errorf("step %d: hash %x not decided for full request", i, hash)
+					return
+				}
+			}
+
+		case isDecidedPartial:
+			for hash := range step {
+				if _, ok := fetcher.partial[hash]; !ok {
+					t.Errorf("step %d: hash %x not decided for partial request", i, hash)
+					return
+				}
+			}
+
+		case isBlobScheduled:
+			// todo fetches
+			// Check tracking (announces) - bidirectional verification
+			for peer, announces := range step.announces {
+				peerAnnounces := fetcher.announces[peer]
+				if peerAnnounces == nil {
+					t.Errorf("step %d: peer %s missing from announces", i, peer)
+					continue
+				}
+				// Check expected announces are present
+				for _, ann := range announces {
+					if cellWithSeq, ok := peerAnnounces[ann.hash]; !ok {
+						t.Errorf("step %d, peer %s: hash %x missing from announces", i, peer, ann.hash)
+					} else if *cellWithSeq.cells != ann.custody {
+						t.Errorf("step %d, peer %s, hash %x: custody mismatch in announces", i, peer, ann.hash)
+					}
+				}
+				// Check no unexpected announces are present
+				for hash := range peerAnnounces {
+					found := false
+					for _, ann := range announces {
+						if ann.hash == hash {
+							found = true
+							break
+						}
+					}
+					if !found {
+						t.Errorf("step %d, peer %s: unexpected hash %x in announces", i, peer, hash)
+					}
+				}
+			}
+			// Check no unexpected peers in announces
+			for peer := range fetcher.announces {
+				if _, ok := step.announces[peer]; !ok {
+					t.Errorf("step %d: unexpected peer %s in announces", i, peer)
+				}
+			}
+
+			// Check fetching (requests)
+			for peer, requests := range step.fetching {
+				peerRequests := fetcher.requests[peer]
+				if peerRequests == nil {
+					t.Errorf("step %d: peer %s missing from requests", i, peer)
+					continue
+				}
+				// Check expected requests are present
+				for _, req := range requests {
+					found := false
+					for _, cellReq := range peerRequests {
+						for _, hash := range cellReq.txs {
+							if hash == req.hash && *cellReq.cells == req.custody {
+								found = true
+								break
+							}
+						}
+						if found {
+							break
+						}
+					}
+					if !found {
+						t.Errorf("step %d, peer %s: hash %x with custody not found in requests", i, peer, req.hash)
+					}
+				}
+				// (bidirectional) Check no unexpected requests are present
+				for _, cellReq := range peerRequests {
+					for _, hash := range cellReq.txs {
+						found := false
+						for _, req := range requests {
+							if req.hash == hash && *cellReq.cells == req.custody {
+								found = true
+								break
+							}
+						}
+						if !found {
+							t.Errorf("step %d, peer %s: unexpected hash %x in requests", i, peer, hash)
+						}
+					}
+				}
+			}
+			// Check no unexpected peers in requests
+			for peer := range fetcher.requests {
+				if _, ok := step.fetching[peer]; !ok {
+					t.Errorf("step %d: unexpected peer %s in requests", i, peer)
+				}
+			}
+
+			// Check internal consistency: alternates should match announces
+			// For every hash being fetched, alternates should contain all peers who announced it
+			for _, announces := range step.fetching {
+				for _, announce := range announces {
+					hash := announce.hash
+					alternates := fetcher.alternates[hash]
+					if alternates == nil {
+						t.Errorf("step %d: hash %x missing from alternates", i, hash)
+						continue
+					}
+
+					// Check that all peers with this hash in announces are in alternates with matching custody
+					for peer, peerAnnounces := range fetcher.announces {
+						if cellWithSeq := peerAnnounces[hash]; cellWithSeq != nil {
+							if altCustody, ok := alternates[peer]; !ok {
+								t.Errorf("step %d, hash %x: peer %s missing from alternates", i, hash, peer)
+							} else if *altCustody != *cellWithSeq.cells {
+								t.Errorf("step %d, hash %x, peer %s: custody bitmap mismatch in alternates", i, hash, peer)
+							}
+						}
+					}
+
+					// Check that all peers in alternates actually have this hash announced with matching custody
+					for peer, altCustody := range alternates {
+						if fetcher.announces[peer] == nil || fetcher.announces[peer][hash] == nil {
+							t.Errorf("step %d, hash %x: peer %s extra in alternates", i, hash, peer)
+						} else if cellWithSeq := fetcher.announces[peer][hash]; *cellWithSeq.cells != *altCustody {
+							t.Errorf("step %d, hash %x, peer %s: custody bitmap mismatch between announces and alternates", i, hash, peer)
+						}
+					}
+				}
+			}
+
+		case isFetching:
+			// Check expected hashes are present in fetches
+			for hash, expected := range step.hashes {
+				if fetchStatus, ok := fetcher.fetches[hash]; !ok {
+					t.Errorf("step %d: hash %x missing from fetches", i, hash)
+				} else {
+					// Check fetching bitmap
+					if expected.fetching != nil {
+						if fetchStatus.fetching == nil {
+							t.Errorf("step %d, hash %x: fetching bitmap is nil", i, hash)
+						} else if *fetchStatus.fetching != *expected.fetching {
+							t.Errorf("step %d, hash %x: fetching bitmap mismatch", i, hash)
+						}
+					}
+
+					// Check fetched indices
+					if expected.fetched != nil {
+						if len(fetchStatus.fetched) != len(expected.fetched) {
+							t.Errorf("step %d, hash %x: fetched length mismatch, got %d, want %d", i, hash, len(fetchStatus.fetched), len(expected.fetched))
+						} else {
+							// Sort both slices before comparing
+							gotFetched := make([]uint64, len(fetchStatus.fetched))
+							copy(gotFetched, fetchStatus.fetched)
+							slices.Sort(gotFetched)
+
+							expectedFetched := make([]uint64, len(expected.fetched))
+							copy(expectedFetched, expected.fetched)
+							slices.Sort(expectedFetched)
+
+							if !slices.Equal(gotFetched, expectedFetched) {
+								t.Errorf("step %d, hash %x: fetched indices mismatch", i, hash)
+							}
+						}
+					}
+				}
+			}
+			// Check no unexpected hashes in fetches
+			for hash := range fetcher.fetches {
+				if _, ok := step.hashes[hash]; !ok {
+					t.Errorf("step %d: unexpected hash %x in fetches", i, hash)
+				}
+			}
+
+		case isCompleted:
+			for _, hash := range step {
+				if _, ok := fetcher.fetches[hash]; ok {
+					t.Errorf("step %d: hash %x still in fetches (should be completed)", i, hash)
+					return
+				}
+			}
+
+		case isDropped:
+			for _, peer := range step {
+				if _, ok := fetcher.announces[peer]; ok {
+					t.Errorf("step %d: peer %s still has announces (should be dropped)", i, peer)
+					return
+				}
+			}
+
+		case doWait:
+			clock.Run(step.time)
+			if step.step {
+				<-wait
+			}
+
+		case doDrop:
+			if err := fetcher.Drop(string(step)); err != nil {
+				t.Errorf("step %d: %v", i, err)
+			}
+			<-wait
+
+		default:
+			t.Errorf("step %d: unknown step type %T", i, step)
+			return
+		}
+	}
+}

eth/fetcher/metrics.go

@@ -57,4 +57,25 @@ var (
 	// to become "unfrozen", either by eventually replying to the request
 	// or by being dropped, measuring from the moment the request was sent.
 	txFetcherSlowWait = metrics.NewRegisteredHistogram("eth/fetcher/transaction/slow/wait", nil, metrics.NewExpDecaySample(1028, 0.015))
+
+	blobAnnounceInMeter  = metrics.NewRegisteredMeter("eth/fetcher/blob/announces/in", nil)
+	blobAnnounceDOSMeter = metrics.NewRegisteredMeter("eth/fetcher/blob/announces/dos", nil)
+
+	blobRequestOutMeter     = metrics.NewRegisteredMeter("eth/fetcher/blob/request/out", nil)
+	blobRequestFailMeter    = metrics.NewRegisteredMeter("eth/fetcher/blob/request/fail", nil)
+	blobRequestDoneMeter    = metrics.NewRegisteredMeter("eth/fetcher/blob/request/done", nil)
+	blobRequestTimeoutMeter = metrics.NewRegisteredMeter("eth/fetcher/blob/request/timeout", nil)
+
+	blobReplyInMeter     = metrics.NewRegisteredMeter("eth/fetcher/blob/replies/in", nil)
+	blobReplyRejectMeter = metrics.NewRegisteredMeter("eth/fetcher/blob/replies/reject", nil)
+
+	blobFetcherWaitingPeers   = metrics.NewRegisteredGauge("eth/fetcher/blob/waiting/peers", nil)
+	blobFetcherWaitingHashes  = metrics.NewRegisteredGauge("eth/fetcher/blob/waiting/hashes", nil)
+	blobFetcherQueueingPeers  = metrics.NewRegisteredGauge("eth/fetcher/blob/queueing/peers", nil)
+	blobFetcherQueueingHashes = metrics.NewRegisteredGauge("eth/fetcher/blob/queueing/hashes", nil)
+	blobFetcherFetchingPeers  = metrics.NewRegisteredGauge("eth/fetcher/blob/fetching/peers", nil)
+	blobFetcherFetchingHashes = metrics.NewRegisteredGauge("eth/fetcher/blob/fetching/hashes", nil)
+
+	blobFetcherWaitTime  = metrics.NewRegisteredHistogram("eth/fetcher/blob/wait/time", nil, metrics.NewExpDecaySample(1028, 0.015))
+	blobFetcherFetchTime = metrics.NewRegisteredHistogram("eth/fetcher/blob/fetch/time", nil, metrics.NewExpDecaySample(1028, 0.015))
 )

eth/fetcher/tx_fetcher.go

@@ -232,7 +232,7 @@ func NewTxFetcherForTests(
 
 // Notify announces the fetcher of the potential availability of a new batch of
 // transactions in the network.
-func (f *TxFetcher) Notify(peer string, types []byte, sizes []uint32, hashes []common.Hash) error {
+func (f *TxFetcher) Notify(peer string, kinds []byte, sizes []uint32, hashes []common.Hash) ([]common.Hash, error) {
 	// Keep track of all the announced transactions
 	txAnnounceInMeter.Mark(int64(len(hashes)))
 
@@ -245,12 +245,14 @@ func (f *TxFetcher) Notify(peer string, types []byte, sizes []uint32, hashes []c
 		unknownHashes = make([]common.Hash, 0, len(hashes))
 		unknownMetas  = make([]txMetadata, 0, len(hashes))
 
+		blobFetchHashes = make([]common.Hash, 0, len(hashes))
+
 		duplicate   int64
 		onchain     int64
 		underpriced int64
 	)
 	for i, hash := range hashes {
-		err := f.validateMeta(hash, types[i])
+		err := f.validateMeta(hash, kinds[i])
 		if errors.Is(err, txpool.ErrAlreadyKnown) {
 			duplicate++
 			continue
@@ -271,11 +273,14 @@ func (f *TxFetcher) Notify(peer string, types []byte, sizes []uint32, hashes []c
 		}
 
 		unknownHashes = append(unknownHashes, hash)
+		if kinds[i] == types.BlobTxType {
+			blobFetchHashes = append(blobFetchHashes, hash)
+		}
 
 		// Transaction metadata has been available since eth68, and all
 		// legacy eth protocols (prior to eth68) have been deprecated.
 		// Therefore, metadata is always expected in the announcement.
-		unknownMetas = append(unknownMetas, txMetadata{kind: types[i], size: sizes[i]})
+		unknownMetas = append(unknownMetas, txMetadata{kind: kinds[i], size: sizes[i]})
 	}
 	txAnnounceKnownMeter.Mark(duplicate)
 	txAnnounceUnderpricedMeter.Mark(underpriced)
@@ -283,14 +288,14 @@ func (f *TxFetcher) Notify(peer string, types []byte, sizes []uint32, hashes []c
 
 	// If anything's left to announce, push it into the internal loop
 	if len(unknownHashes) == 0 {
-		return nil
+		return blobFetchHashes, nil
 	}
 	announce := &txAnnounce{origin: peer, hashes: unknownHashes, metas: unknownMetas}
 	select {
 	case f.notify <- announce:
-		return nil
+		return blobFetchHashes, nil
 	case <-f.quit:
-		return errTerminated
+		return nil, errTerminated
 	}
 }
 

eth/fetcher/tx_fetcher_test.go

@@ -1888,7 +1888,7 @@ func testTransactionFetcher(t *testing.T, tt txFetcherTest) {
 		// Process the original or expanded steps
 		switch step := step.(type) {
 		case doTxNotify:
-			if err := fetcher.Notify(step.peer, step.types, step.sizes, step.hashes); err != nil {
+			if _, err := fetcher.Notify(step.peer, step.types, step.sizes, step.hashes); err != nil {
 				t.Errorf("step %d: %v", i, err)
 			}
 			<-wait // Fetcher needs to process this, wait until it's done

eth/handler.go

@@ -33,6 +33,7 @@ import (
 	"github.com/ethereum/go-ethereum/core/rawdb"
 	"github.com/ethereum/go-ethereum/core/txpool"
 	"github.com/ethereum/go-ethereum/core/types"
+	"github.com/ethereum/go-ethereum/crypto/kzg4844"
 	"github.com/ethereum/go-ethereum/eth/downloader"
 	"github.com/ethereum/go-ethereum/eth/ethconfig"
 	"github.com/ethereum/go-ethereum/eth/fetcher"
@@ -75,7 +76,7 @@ type txPool interface {
 
 	// GetRLP retrieves the RLP-encoded transaction from local txpool
 	// with given tx hash.
-	GetRLP(hash common.Hash) []byte
+	GetRLP(hash common.Hash, includeBlob bool) []byte
 
 	// GetMetadata returns the transaction type and transaction size with the
 	// given transaction hash.
@@ -97,6 +98,16 @@ type txPool interface {
 	FilterType(kind byte) bool
 }
 
+// blobPool defines the methods needed from a blob pool implementation to
+// support cell-based blob data availability.
+type blobPool interface {
+	Has(hash common.Hash) bool
+	GetCells(hash common.Hash, mask types.CustodyBitmap) ([]kzg4844.Cell, error)
+	ValidateCells([]common.Hash, [][]kzg4844.Cell, *types.CustodyBitmap) []error
+	AddPayload([]common.Hash, [][]kzg4844.Cell, *types.CustodyBitmap) []error
+	GetCustody(hash common.Hash) *types.CustodyBitmap
+}
+
 // handlerConfig is the collection of initialization parameters to create a full
 // node network handler.
 type handlerConfig struct {
@@ -104,11 +115,13 @@ type handlerConfig struct {
 	Database       ethdb.Database         // Database for direct sync insertions
 	Chain          *core.BlockChain       // Blockchain to serve data from
 	TxPool         txPool                 // Transaction pool to propagate from
+	BlobPool       blobPool               // Blob pool for cell-based blob data availability
 	Network        uint64                 // Network identifier to advertise
 	Sync           ethconfig.SyncMode     // Whether to snap or full sync
 	BloomCache     uint64                 // Megabytes to alloc for snap sync bloom
 	EventMux       *event.TypeMux         // Legacy event mux, deprecate for `feed`
 	RequiredBlocks map[uint64]common.Hash // Hard coded map of required block hashes for sync challenges
+	Custody        types.CustodyBitmap
 }
 
 type handler struct {
@@ -118,11 +131,13 @@ type handler struct {
 
 	database ethdb.Database
 	txpool   txPool
+	blobpool blobPool
 	chain    *core.BlockChain
 	maxPeers int
 
 	downloader     *downloader.Downloader
 	txFetcher      *fetcher.TxFetcher
+	blobFetcher    *fetcher.BlobFetcher
 	peers          *peerSet
 	txBroadcastKey [16]byte
 
@@ -154,6 +169,7 @@ func newHandler(config *handlerConfig) (*handler, error) {
 		eventMux:       config.EventMux,
 		database:       config.Database,
 		txpool:         config.TxPool,
+		blobpool:       config.BlobPool,
 		chain:          config.Chain,
 		peers:          newPeerSet(),
 		txBroadcastKey: newBroadcastChoiceKey(),
@@ -189,6 +205,16 @@ func newHandler(config *handlerConfig) (*handler, error) {
 		return nil
 	}
 	h.txFetcher = fetcher.NewTxFetcher(h.chain, validateMeta, addTxs, fetchTx, h.removePeer)
+
+	// Construct the blob fetcher for cell-based blob data availability
+	fetchPayloads := func(peer string, hashes []common.Hash, cells *types.CustodyBitmap) error {
+		p := h.peers.peer(peer)
+		if p == nil {
+			return errors.New("unknown peer")
+		}
+		return p.RequestPayload(hashes, cells)
+	}
+	h.blobFetcher = fetcher.NewBlobFetcher(h.blobpool.ValidateCells, h.blobpool.AddPayload, fetchPayloads, h.removePeer, &config.Custody, nil)
 	return h, nil
 }
 
@@ -403,6 +429,7 @@ func (h *handler) unregisterPeer(id string) {
 	}
 	h.downloader.UnregisterPeer(id)
 	h.txFetcher.Drop(id)
+	h.blobFetcher.Drop(id)
 
 	if err := h.peers.unregisterPeer(id); err != nil {
 		logger.Error("Ethereum peer removal failed", "err", err)
@@ -425,6 +452,7 @@ func (h *handler) Start(maxPeers int) {
 
 	// start sync handlers
 	h.txFetcher.Start()
+	h.blobFetcher.Start()
 
 	// start peer handler tracker
 	h.wg.Add(1)
@@ -435,6 +463,7 @@ func (h *handler) Stop() {
 	h.txsSub.Unsubscribe() // quits txBroadcastLoop
 	h.blockRange.stop()
 	h.txFetcher.Stop()
+	h.blobFetcher.Stop()
 	h.downloader.Terminate()
 
 	// Quit chainSync and txsync64.

eth/handler_eth.go

@@ -33,6 +33,7 @@ type ethHandler handler
 
 func (h *ethHandler) Chain() *core.BlockChain { return h.chain }
 func (h *ethHandler) TxPool() eth.TxPool      { return h.txpool }
+func (h *ethHandler) BlobPool() eth.BlobPool  { return h.blobpool }
 
 // RunPeer is invoked when a peer joins on the `eth` protocol.
 func (h *ethHandler) RunPeer(peer *eth.Peer, hand eth.Handler) error {
@@ -58,8 +59,19 @@ func (h *ethHandler) AcceptTxs() bool {
 func (h *ethHandler) Handle(peer *eth.Peer, packet eth.Packet) error {
 	// Consume any broadcasts and announces, forwarding the rest to the downloader
 	switch packet := packet.(type) {
-	case *eth.NewPooledTransactionHashesPacket:
+	case *eth.NewPooledTransactionHashesPacket71:
-		return h.txFetcher.Notify(peer.ID(), packet.Types, packet.Sizes, packet.Hashes)
+		hashes, err := h.txFetcher.Notify(peer.ID(), packet.Types, packet.Sizes, packet.Hashes)
+		if err != nil {
+			return err
+		}
+		if len(hashes) != 0 {
+			return h.blobFetcher.Notify(peer.ID(), hashes, packet.Mask)
+		}
+		return nil
+
+	case *eth.NewPooledTransactionHashesPacket70:
+		_, err := h.txFetcher.Notify(peer.ID(), packet.Types, packet.Sizes, packet.Hashes)
+		return err
 
 	case *eth.TransactionsPacket:
 		txs, err := packet.Items()
@@ -81,6 +93,9 @@ func (h *ethHandler) Handle(peer *eth.Peer, packet eth.Packet) error {
 		}
 		return h.txFetcher.Enqueue(peer.ID(), txs, true)
 
+	case *eth.CellsResponse:
+		return h.blobFetcher.Enqueue(peer.ID(), packet.Hashes, packet.Cells, packet.Mask)
+
 	default:
 		return fmt.Errorf("unexpected eth packet type: %T", packet)
 	}
@@ -98,11 +113,17 @@ func handleTransactions(peer *eth.Peer, list []*types.Transaction, directBroadca
 				// If we receive any blob transactions missing sidecars, or with
 				// sidecars that don't correspond to the versioned hashes reported
 				// in the header, disconnect from the sending peer.
-				if tx.BlobTxSidecar() == nil {
+				if peer.Version() >= eth.ETH71 {
-					return errors.New("received sidecar-less blob transaction")
+					if tx.BlobTxSidecar() != nil && len(tx.BlobTxSidecar().Blobs) != 0 {
-				}
+						return fmt.Errorf("not allowed to respond with full-blob transaction under eth71")
-				if err := tx.BlobTxSidecar().ValidateBlobCommitmentHashes(tx.BlobHashes()); err != nil {
+					}
-					return err
+				} else {
+					if tx.BlobTxSidecar() == nil {
+						return errors.New("received sidecar-less blob transaction")
+					}
+					if err := tx.BlobTxSidecar().ValidateBlobCommitmentHashes(tx.BlobHashes()); err != nil {
+						return err
+					}
 				}
 			}
 		}

eth/handler_eth_test.go

@@ -44,13 +44,14 @@ type testEthHandler struct {
 
 func (h *testEthHandler) Chain() *core.BlockChain              { panic("no backing chain") }
 func (h *testEthHandler) TxPool() eth.TxPool                   { panic("no backing tx pool") }
+func (h *testEthHandler) BlobPool() eth.BlobPool               { return nil }
 func (h *testEthHandler) AcceptTxs() bool                      { return true }
 func (h *testEthHandler) RunPeer(*eth.Peer, eth.Handler) error { panic("not used in tests") }
 func (h *testEthHandler) PeerInfo(enode.ID) interface{}        { panic("not used in tests") }
 
 func (h *testEthHandler) Handle(peer *eth.Peer, packet eth.Packet) error {
 	switch packet := packet.(type) {
-	case *eth.NewPooledTransactionHashesPacket:
+	case *eth.NewPooledTransactionHashesPacket70:
 		h.txAnnounces.Send(packet.Hashes)
 		return nil
 
@@ -105,10 +106,12 @@ func testForkIDSplit(t *testing.T, protocol uint) {
 		_, blocksNoFork, _  = core.GenerateChainWithGenesis(gspecNoFork, engine, 2, nil)
 		_, blocksProFork, _ = core.GenerateChainWithGenesis(gspecProFork, engine, 2, nil)
 
+		txPool       = newTestTxPool()
 		ethNoFork, _ = newHandler(&handlerConfig{
 			Database:   dbNoFork,
 			Chain:      chainNoFork,
-			TxPool:     newTestTxPool(),
+			TxPool:     txPool,
+			BlobPool:   txPool,
 			Network:    1,
 			Sync:       ethconfig.FullSync,
 			BloomCache: 1,
@@ -116,7 +119,8 @@ func testForkIDSplit(t *testing.T, protocol uint) {
 		ethProFork, _ = newHandler(&handlerConfig{
 			Database:   dbProFork,
 			Chain:      chainProFork,
-			TxPool:     newTestTxPool(),
+			TxPool:     txPool,
+			BlobPool:   txPool,
 			Network:    1,
 			Sync:       ethconfig.FullSync,
 			BloomCache: 1,
@@ -137,8 +141,8 @@ func testForkIDSplit(t *testing.T, protocol uint) {
 	defer p2pNoFork.Close()
 	defer p2pProFork.Close()
 
-	peerNoFork := eth.NewPeer(protocol, p2p.NewPeerPipe(enode.ID{1}, "", nil, p2pNoFork), p2pNoFork, nil)
+	peerNoFork := eth.NewPeer(protocol, p2p.NewPeerPipe(enode.ID{1}, "", nil, p2pNoFork), p2pNoFork, nil, nil)
-	peerProFork := eth.NewPeer(protocol, p2p.NewPeerPipe(enode.ID{2}, "", nil, p2pProFork), p2pProFork, nil)
+	peerProFork := eth.NewPeer(protocol, p2p.NewPeerPipe(enode.ID{2}, "", nil, p2pProFork), p2pProFork, nil, nil)
 	defer peerNoFork.Close()
 	defer peerProFork.Close()
 
@@ -168,8 +172,8 @@ func testForkIDSplit(t *testing.T, protocol uint) {
 	defer p2pNoFork.Close()
 	defer p2pProFork.Close()
 
-	peerNoFork = eth.NewPeer(protocol, p2p.NewPeer(enode.ID{1}, "", nil), p2pNoFork, nil)
+	peerNoFork = eth.NewPeer(protocol, p2p.NewPeer(enode.ID{1}, "", nil), p2pNoFork, nil, nil)
-	peerProFork = eth.NewPeer(protocol, p2p.NewPeer(enode.ID{2}, "", nil), p2pProFork, nil)
+	peerProFork = eth.NewPeer(protocol, p2p.NewPeer(enode.ID{2}, "", nil), p2pProFork, nil, nil)
 	defer peerNoFork.Close()
 	defer peerProFork.Close()
 
@@ -199,8 +203,8 @@ func testForkIDSplit(t *testing.T, protocol uint) {
 	defer p2pNoFork.Close()
 	defer p2pProFork.Close()
 
-	peerNoFork = eth.NewPeer(protocol, p2p.NewPeerPipe(enode.ID{1}, "", nil, p2pNoFork), p2pNoFork, nil)
+	peerNoFork = eth.NewPeer(protocol, p2p.NewPeerPipe(enode.ID{1}, "", nil, p2pNoFork), p2pNoFork, nil, nil)
-	peerProFork = eth.NewPeer(protocol, p2p.NewPeerPipe(enode.ID{2}, "", nil, p2pProFork), p2pProFork, nil)
+	peerProFork = eth.NewPeer(protocol, p2p.NewPeerPipe(enode.ID{2}, "", nil, p2pProFork), p2pProFork, nil, nil)
 	defer peerNoFork.Close()
 	defer peerProFork.Close()
 
@@ -249,8 +253,8 @@ func testRecvTransactions(t *testing.T, protocol uint) {
 	defer p2pSrc.Close()
 	defer p2pSink.Close()
 
-	src := eth.NewPeer(protocol, p2p.NewPeerPipe(enode.ID{1}, "", nil, p2pSrc), p2pSrc, handler.txpool)
+	src := eth.NewPeer(protocol, p2p.NewPeerPipe(enode.ID{1}, "", nil, p2pSrc), p2pSrc, handler.txpool, handler.txpool)
-	sink := eth.NewPeer(protocol, p2p.NewPeerPipe(enode.ID{2}, "", nil, p2pSink), p2pSink, handler.txpool)
+	sink := eth.NewPeer(protocol, p2p.NewPeerPipe(enode.ID{2}, "", nil, p2pSink), p2pSink, handler.txpool, handler.txpool)
 	defer src.Close()
 	defer sink.Close()
 
@@ -305,8 +309,8 @@ func testSendTransactions(t *testing.T, protocol uint) {
 	defer p2pSrc.Close()
 	defer p2pSink.Close()
 
-	src := eth.NewPeer(protocol, p2p.NewPeerPipe(enode.ID{1}, "", nil, p2pSrc), p2pSrc, handler.txpool)
+	src := eth.NewPeer(protocol, p2p.NewPeerPipe(enode.ID{1}, "", nil, p2pSrc), p2pSrc, handler.txpool, handler.blobpool)
-	sink := eth.NewPeer(protocol, p2p.NewPeerPipe(enode.ID{2}, "", nil, p2pSink), p2pSink, handler.txpool)
+	sink := eth.NewPeer(protocol, p2p.NewPeerPipe(enode.ID{2}, "", nil, p2pSink), p2pSink, handler.txpool, handler.blobpool)
 	defer src.Close()
 	defer sink.Close()
 
@@ -380,8 +384,8 @@ func testTransactionPropagation(t *testing.T, protocol uint) {
 		defer sourcePipe.Close()
 		defer sinkPipe.Close()
 
-		sourcePeer := eth.NewPeer(protocol, p2p.NewPeerPipe(enode.ID{byte(i + 1)}, "", nil, sourcePipe), sourcePipe, source.txpool)
+		sourcePeer := eth.NewPeer(protocol, p2p.NewPeerPipe(enode.ID{byte(i + 1)}, "", nil, sourcePipe), sourcePipe, source.txpool, source.txpool)
-		sinkPeer := eth.NewPeer(protocol, p2p.NewPeerPipe(enode.ID{0}, "", nil, sinkPipe), sinkPipe, sink.txpool)
+		sinkPeer := eth.NewPeer(protocol, p2p.NewPeerPipe(enode.ID{0}, "", nil, sinkPipe), sinkPipe, sink.txpool, sink.txpool)
 		defer sourcePeer.Close()
 		defer sinkPeer.Close()
 

eth/handler_test.go

@@ -17,6 +17,7 @@
 package eth
 
 import (
+	"errors"
 	"maps"
 	"math/big"
 	"math/rand"
@@ -31,6 +32,7 @@ import (
 	"github.com/ethereum/go-ethereum/core/txpool"
 	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/ethereum/go-ethereum/crypto"
+	"github.com/ethereum/go-ethereum/crypto/kzg4844"
 	"github.com/ethereum/go-ethereum/eth/ethconfig"
 	"github.com/ethereum/go-ethereum/eth/protocols/eth"
 	"github.com/ethereum/go-ethereum/ethdb"
@@ -54,7 +56,10 @@ var (
 // Its goal is to get around setting up a valid statedb for the balance and nonce
 // checks.
 type testTxPool struct {
-	pool map[common.Hash]*types.Transaction // Hash map of collected transactions
+	txPool   map[common.Hash]*types.Transaction // Hash map of collected transactions
+	cellPool map[common.Hash][]kzg4844.Cell
+
+	custody map[common.Hash]types.CustodyBitmap
 
 	txFeed event.Feed   // Notification feed to allow waiting for inclusion
 	lock   sync.RWMutex // Protects the transaction pool
@@ -63,7 +68,9 @@ type testTxPool struct {
 // newTestTxPool creates a mock transaction pool.
 func newTestTxPool() *testTxPool {
 	return &testTxPool{
-		pool: make(map[common.Hash]*types.Transaction),
+		txPool:   make(map[common.Hash]*types.Transaction),
+		cellPool: make(map[common.Hash][]kzg4844.Cell),
+		custody:  make(map[common.Hash]types.CustodyBitmap),
 	}
 }
 
@@ -73,7 +80,7 @@ func (p *testTxPool) Has(hash common.Hash) bool {
 	p.lock.Lock()
 	defer p.lock.Unlock()
 
-	return p.pool[hash] != nil
+	return p.txPool[hash] != nil
 }
 
 // Get retrieves the transaction from local txpool with given
@@ -81,16 +88,16 @@ func (p *testTxPool) Has(hash common.Hash) bool {
 func (p *testTxPool) Get(hash common.Hash) *types.Transaction {
 	p.lock.Lock()
 	defer p.lock.Unlock()
-	return p.pool[hash]
+	return p.txPool[hash]
 }
 
 // Get retrieves the transaction from local txpool with given
 // tx hash.
-func (p *testTxPool) GetRLP(hash common.Hash) []byte {
+func (p *testTxPool) GetRLP(hash common.Hash, includeBlob bool) []byte {
 	p.lock.Lock()
 	defer p.lock.Unlock()
 
-	tx := p.pool[hash]
+	tx := p.txPool[hash]
 	if tx != nil {
 		blob, _ := rlp.EncodeToBytes(tx)
 		return blob
@@ -104,7 +111,7 @@ func (p *testTxPool) GetMetadata(hash common.Hash) *txpool.TxMetadata {
 	p.lock.Lock()
 	defer p.lock.Unlock()
 
-	tx := p.pool[hash]
+	tx := p.txPool[hash]
 	if tx != nil {
 		return &txpool.TxMetadata{
 			Type: tx.Type(),
@@ -121,7 +128,7 @@ func (p *testTxPool) Add(txs []*types.Transaction, sync bool) []error {
 	defer p.lock.Unlock()
 
 	for _, tx := range txs {
-		p.pool[tx.Hash()] = tx
+		p.txPool[tx.Hash()] = tx
 	}
 	p.txFeed.Send(core.NewTxsEvent{Txs: txs})
 	return make([]error, len(txs))
@@ -134,7 +141,7 @@ func (p *testTxPool) Pending(filter txpool.PendingFilter) (map[common.Address][]
 
 	var count int
 	batches := make(map[common.Address][]*types.Transaction)
-	for _, tx := range p.pool {
+	for _, tx := range p.txPool {
 		from, _ := types.Sender(types.HomesteadSigner{}, tx)
 		batches[from] = append(batches[from], tx)
 	}
@@ -164,6 +171,68 @@ func (p *testTxPool) Pending(filter txpool.PendingFilter) (map[common.Address][]
 func (p *testTxPool) SubscribeTransactions(ch chan<- core.NewTxsEvent, reorgs bool) event.Subscription {
 	return p.txFeed.Subscribe(ch)
 }
+func (p *testTxPool) GetCells(hash common.Hash, mask types.CustodyBitmap) ([]kzg4844.Cell, error) {
+	p.lock.RLock()
+	defer p.lock.RUnlock()
+
+	_, exists := p.txPool[hash]
+	if !exists {
+		return nil, errors.New("Requested tx does not exist")
+	}
+
+	var cells []kzg4844.Cell
+
+	if cells, exists = p.cellPool[hash]; !exists {
+		return nil, errors.New("Requested cells do not exist")
+	}
+
+	result := make([]kzg4844.Cell, 0, mask.OneCount())
+	for _, idx := range mask.Indices() {
+		if int(idx) < len(cells) {
+			result = append(result, cells[idx])
+		}
+	}
+	return result, nil
+}
+
+func (p *testTxPool) GetCustody(hash common.Hash) *types.CustodyBitmap {
+	p.lock.RLock()
+	defer p.lock.RUnlock()
+	mask, ok := p.custody[hash]
+	if !ok {
+		return nil
+	}
+	return &mask
+}
+
+// AddCells adds cells for a specific transaction hash (for testing)
+func (p *testTxPool) AddCells(hash common.Hash, cells []kzg4844.Cell, mask types.CustodyBitmap) {
+	p.lock.Lock()
+	defer p.lock.Unlock()
+	p.cellPool[hash] = cells
+	p.custody[hash] = mask
+}
+
+func (p *testTxPool) AddPayload(txs []common.Hash, cells [][]kzg4844.Cell, custody *types.CustodyBitmap) []error {
+	p.lock.Lock()
+	defer p.lock.Unlock()
+
+	for i, tx := range txs {
+		p.cellPool[tx] = cells[i]
+	}
+	return nil
+}
+
+func (p *testTxPool) ValidateCells(txs []common.Hash, cells [][]kzg4844.Cell, custody *types.CustodyBitmap) []error {
+	p.lock.Lock()
+	defer p.lock.Unlock()
+
+	errors := make([]error, len(txs))
+	for i, tx := range txs {
+		errors[i] = kzg4844.VerifyCells(cells[i], p.txPool[tx].BlobTxSidecar().Commitments, p.txPool[tx].BlobTxSidecar().Proofs, custody.Indices())
+	}
+	return errors
+}
 
 // FilterType should check whether the pool supports the given type of transactions.
 func (p *testTxPool) FilterType(kind byte) bool {
@@ -178,10 +247,11 @@ func (p *testTxPool) FilterType(kind byte) bool {
 // preinitialized with some sane testing defaults and the transaction pool mocked
 // out.
 type testHandler struct {
-	db      ethdb.Database
+	db       ethdb.Database
-	chain   *core.BlockChain
+	chain    *core.BlockChain
-	txpool  *testTxPool
+	txpool   *testTxPool
-	handler *handler
+	blobpool *testTxPool
+	handler  *handler
 }
 
 // newTestHandler creates a new handler for testing purposes with no blocks.
@@ -210,6 +280,7 @@ func newTestHandlerWithBlocks(blocks int, mode ethconfig.SyncMode) *testHandler
 		Database:   db,
 		Chain:      chain,
 		TxPool:     txpool,
+		BlobPool:   txpool,
 		Network:    1,
 		Sync:       mode,
 		BloomCache: 1,
@@ -217,10 +288,11 @@ func newTestHandlerWithBlocks(blocks int, mode ethconfig.SyncMode) *testHandler
 	handler.Start(1000)
 
 	return &testHandler{
-		db:      db,
+		db:       db,
-		chain:   chain,
+		chain:    chain,
-		txpool:  txpool,
+		txpool:   txpool,
-		handler: handler,
+		blobpool: txpool,
+		handler:  handler,
 	}
 }
 
@@ -317,7 +389,7 @@ func createTestPeers(rand *rand.Rand, n int) []*ethPeer {
 		var id enode.ID
 		rand.Read(id[:])
 		p2pPeer := p2p.NewPeer(id, "test", nil)
-		ep := eth.NewPeer(eth.ETH69, p2pPeer, nil, nil)
+		ep := eth.NewPeer(eth.ETH69, p2pPeer, nil, nil, nil)
 		peers[i] = &ethPeer{Peer: ep}
 	}
 	return peers

eth/protocols/eth/broadcast.go

@@ -113,29 +113,51 @@ func (p *Peer) announceTransactions() {
 				pending      []common.Hash
 				pendingTypes []byte
 				pendingSizes []uint32
+				mask         types.CustodyBitmap
 				size         common.StorageSize
+				processed    = make(map[int]bool)
 			)
 			for count = 0; count < len(queue) && size < maxTxPacketSize; count++ {
 				if meta := p.txpool.GetMetadata(queue[count]); meta != nil {
+					custody := p.blobpool.GetCustody(queue[count])
+					if custody != nil {
+						// blob tx
+						if mask.OneCount() == 0 {
+							mask = *custody
+						} else {
+							if mask != *custody {
+								// group by mask
+								continue
+							}
+						}
+					}
 					pending = append(pending, queue[count])
 					pendingTypes = append(pendingTypes, meta.Type)
 					pendingSizes = append(pendingSizes, uint32(meta.Size))
 					size += common.HashLength
+
+					processed[count] = true
 				}
 			}
-			// Shift and trim queue
+			// Shift and trim queue using processed map
-			queue = queue[:copy(queue, queue[count:])]
+			var remaining []common.Hash
+			for i, h := range queue {
+				if !processed[i] {
+					remaining = append(remaining, h)
+				}
+			}
+			queue = remaining
 
 			// If there's anything available to transfer, fire up an async writer
 			if len(pending) > 0 {
 				done = make(chan struct{})
 				go func() {
-					if err := p.sendPooledTransactionHashes(pending, pendingTypes, pendingSizes); err != nil {
+					if err := p.sendPooledTransactionHashes(pending, pendingTypes, pendingSizes, mask); err != nil {
 						fail <- err
 						return
 					}
 					close(done)
-					p.Log().Trace("Sent transaction announcements", "count", len(pending))
+					p.Log().Trace("Sent transaction announcements", "count", len(pending), "mask", mask, "tx", pending)
 				}()
 			}
 		}

eth/protocols/eth/handler.go

@@ -24,6 +24,7 @@ import (
 	"github.com/ethereum/go-ethereum/core"
 	"github.com/ethereum/go-ethereum/core/txpool"
 	"github.com/ethereum/go-ethereum/core/types"
+	"github.com/ethereum/go-ethereum/crypto/kzg4844"
 	"github.com/ethereum/go-ethereum/metrics"
 	"github.com/ethereum/go-ethereum/p2p"
 	"github.com/ethereum/go-ethereum/p2p/enode"
@@ -64,6 +65,9 @@ type Backend interface {
 	// TxPool retrieves the transaction pool object to serve data.
 	TxPool() TxPool
 
+	// BlobPool retrieves the blob pool object to serve cell requests.
+	BlobPool() BlobPool
+
 	// AcceptTxs retrieves whether transaction processing is enabled on the node
 	// or if inbound transactions should simply be dropped.
 	AcceptTxs() bool
@@ -83,6 +87,16 @@ type Backend interface {
 	Handle(peer *Peer, packet Packet) error
 }
 
+// BlobPool defines the methods needed by the protocol handler to serve cell requests.
+type BlobPool interface {
+	// GetCells retrieves cells for a given transaction hash filtered by the custody bitmap.
+	GetCells(hash common.Hash, mask types.CustodyBitmap) ([]kzg4844.Cell, error)
+	// GetCustody returns the custody bitmap for a given transaction hash.
+	GetCustody(hash common.Hash) *types.CustodyBitmap
+	// Has returns whether the blob pool contains a transaction with the given hash.
+	Has(hash common.Hash) bool
+}
+
 // TxPool defines the methods needed by the protocol handler to serve transactions.
 type TxPool interface {
 	// Get retrieves the transaction from the local txpool with the given hash.
@@ -90,7 +104,7 @@ type TxPool interface {
 
 	// GetRLP retrieves the RLP-encoded transaction from the local txpool with
 	// the given hash.
-	GetRLP(hash common.Hash) []byte
+	GetRLP(hash common.Hash, includeBlob bool) []byte
 
 	// GetMetadata returns the transaction type and transaction size with the
 	// given transaction hash.
@@ -106,7 +120,7 @@ func MakeProtocols(backend Backend, network uint64, disc enode.Iterator) []p2p.P
 			Version: version,
 			Length:  protocolLengths[version],
 			Run: func(p *p2p.Peer, rw p2p.MsgReadWriter) error {
-				peer := NewPeer(version, p, rw, backend.TxPool())
+				peer := NewPeer(version, p, rw, backend.TxPool(), backend.BlobPool())
 				defer peer.Close()
 
 				return backend.RunPeer(peer, func(peer *Peer) error {
@@ -180,6 +194,22 @@ var eth69 = map[uint64]msgHandler{
 	BlockRangeUpdateMsg:           handleBlockRangeUpdate,
 }
 
+var eth71 = map[uint64]msgHandler{
+	TransactionsMsg:               handleTransactions,
+	NewPooledTransactionHashesMsg: handleNewPooledTransactionHashes71,
+	GetBlockHeadersMsg:            handleGetBlockHeaders,
+	BlockHeadersMsg:               handleBlockHeaders,
+	GetBlockBodiesMsg:             handleGetBlockBodies,
+	BlockBodiesMsg:                handleBlockBodies,
+	GetReceiptsMsg:                handleGetReceipts,
+	ReceiptsMsg:                   handleReceipts,
+	GetPooledTransactionsMsg:      handleGetPooledTransactions,
+	PooledTransactionsMsg:         handlePooledTransactions,
+	BlockRangeUpdateMsg:           handleBlockRangeUpdate,
+	GetCellsMsg:                   handleGetCells,
+	CellsMsg:                      handleCells,
+}
+
 // handleMessage is invoked whenever an inbound message is received from a remote
 // peer. The remote connection is torn down upon returning any error.
 func handleMessage(backend Backend, peer *Peer) error {
@@ -194,9 +224,12 @@ func handleMessage(backend Backend, peer *Peer) error {
 	defer msg.Discard()
 
 	var handlers map[uint64]msgHandler
-	if peer.version == ETH69 {
+	switch peer.version {
+	case ETH69:
 		handlers = eth69
-	} else {
+	case ETH71:
+		handlers = eth71
+	default:
 		return fmt.Errorf("unknown eth protocol version: %v", peer.version)
 	}
 

eth/protocols/eth/handler_test.go

@@ -62,9 +62,10 @@ func u64(val uint64) *uint64 { return &val }
 // purpose is to allow testing the request/reply workflows and wire serialization
 // in the `eth` protocol without actually doing any data processing.
 type testBackend struct {
-	db     ethdb.Database
+	db       ethdb.Database
-	chain  *core.BlockChain
+	chain    *core.BlockChain
-	txpool *txpool.TxPool
+	txpool   *txpool.TxPool
+	blobpool *blobpool.BlobPool
 }
 
 // newTestBackend creates an empty chain and wraps it into a mock backend.
@@ -142,9 +143,10 @@ func newTestBackendWithGenerator(blocks int, shanghai bool, cancun bool, generat
 	txpool, _ := txpool.New(txconfig.PriceLimit, chain, []txpool.SubPool{legacyPool, blobPool})
 
 	return &testBackend{
-		db:     db,
+		db:       db,
-		chain:  chain,
+		chain:    chain,
-		txpool: txpool,
+		txpool:   txpool,
+		blobpool: blobPool,
 	}
 }
 
@@ -156,6 +158,7 @@ func (b *testBackend) close() {
 
 func (b *testBackend) Chain() *core.BlockChain { return b.chain }
 func (b *testBackend) TxPool() TxPool          { return b.txpool }
+func (b *testBackend) BlobPool() BlobPool      { return b.blobpool }
 
 func (b *testBackend) RunPeer(peer *Peer, handler Handler) error {
 	// Normally the backend would do peer maintenance and handshakes. All that

eth/protocols/eth/handlers.go

@@ -26,6 +26,7 @@ import (
 	"github.com/ethereum/go-ethereum/core"
 	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/ethereum/go-ethereum/crypto"
+	"github.com/ethereum/go-ethereum/crypto/kzg4844"
 	"github.com/ethereum/go-ethereum/log"
 	"github.com/ethereum/go-ethereum/p2p/tracker"
 	"github.com/ethereum/go-ethereum/rlp"
@@ -482,7 +483,27 @@ func handleNewPooledTransactionHashes(backend Backend, msg Decoder, peer *Peer)
 	if !backend.AcceptTxs() {
 		return nil
 	}
-	ann := new(NewPooledTransactionHashesPacket)
+	ann := new(NewPooledTransactionHashesPacket70)
+	if err := msg.Decode(ann); err != nil {
+		return err
+	}
+	if len(ann.Hashes) != len(ann.Types) || len(ann.Hashes) != len(ann.Sizes) {
+		return fmt.Errorf("NewPooledTransactionHashes: invalid len of fields in %v %v %v", len(ann.Hashes), len(ann.Types), len(ann.Sizes))
+	}
+	// Schedule all the unknown hashes for retrieval
+	for _, hash := range ann.Hashes {
+		peer.MarkTransaction(hash)
+	}
+	return backend.Handle(peer, ann)
+}
+
+func handleNewPooledTransactionHashes71(backend Backend, msg Decoder, peer *Peer) error {
+	// New transaction announcement arrived, make sure we have
+	// a valid and fresh chain to handle them
+	if !backend.AcceptTxs() {
+		return nil
+	}
+	ann := new(NewPooledTransactionHashesPacket71)
 	if err := msg.Decode(ann); err != nil {
 		return err
 	}
@@ -502,11 +523,11 @@ func handleGetPooledTransactions(backend Backend, msg Decoder, peer *Peer) error
 	if err := msg.Decode(&query); err != nil {
 		return err
 	}
-	hashes, txs := answerGetPooledTransactions(backend, query.GetPooledTransactionsRequest)
+	hashes, txs := answerGetPooledTransactions(backend, query.GetPooledTransactionsRequest, peer.version < ETH71)
 	return peer.ReplyPooledTransactionsRLP(query.RequestId, hashes, txs)
 }
 
-func answerGetPooledTransactions(backend Backend, query GetPooledTransactionsRequest) ([]common.Hash, []rlp.RawValue) {
+func answerGetPooledTransactions(backend Backend, query GetPooledTransactionsRequest, includeBlob bool) ([]common.Hash, []rlp.RawValue) {
 	// Gather transactions until the fetch or network limits is reached
 	var (
 		bytes  int
@@ -518,7 +539,7 @@ func answerGetPooledTransactions(backend Backend, query GetPooledTransactionsReq
 			break
 		}
 		// Retrieve the requested transaction, skipping if unknown to us
-		encoded := backend.TxPool().GetRLP(hash)
+		encoded := backend.TxPool().GetRLP(hash, includeBlob)
 		if len(encoded) == 0 {
 			continue
 		}
@@ -580,3 +601,52 @@ func handleBlockRangeUpdate(backend Backend, msg Decoder, peer *Peer) error {
 	peer.lastRange.Store(&update)
 	return nil
 }
+
+func handleGetCells(backend Backend, msg Decoder, peer *Peer) error {
+	// Decode the cell retrieval message
+	var query GetCellsRequestPacket
+	if err := msg.Decode(&query); err != nil {
+		return err
+	}
+	hashes, cells, custody := answerGetCells(backend, query.GetCellsRequest)
+	return peer.ReplyCells(query.RequestId, hashes, cells, custody)
+}
+
+func answerGetCells(backend Backend, query GetCellsRequest) ([]common.Hash, [][]kzg4844.Cell, types.CustodyBitmap) {
+	var (
+		cellCounts int
+		hashes     []common.Hash
+		cells      [][]kzg4844.Cell
+	)
+	maxCells := softResponseLimit / 2048
+	for _, hash := range query.Hashes {
+		if cellCounts >= maxCells {
+			break
+		}
+		cell, _ := backend.BlobPool().GetCells(hash, query.Mask)
+		if len(cell) == 0 {
+			// skip this tx
+			continue
+		}
+		hashes = append(hashes, hash)
+		cells = append(cells, cell)
+		cellCounts += len(cell)
+	}
+	return hashes, cells, query.Mask
+}
+
+func handleCells(backend Backend, msg Decoder, peer *Peer) error {
+	var cellsResponse CellsPacket
+	if err := msg.Decode(&cellsResponse); err != nil {
+		return err
+	}
+	tresp := tracker.Response{
+		ID:      cellsResponse.RequestId,
+		MsgCode: CellsMsg,
+		Size:    len(cellsResponse.CellsResponse.Hashes),
+	}
+	if err := peer.tracker.Fulfil(tresp); err != nil {
+		return fmt.Errorf("Cells: %w", err)
+	}
+	return backend.Handle(peer, &cellsResponse.CellsResponse)
+}

eth/protocols/eth/handshake_test.go

@@ -77,7 +77,7 @@ func testHandshake(t *testing.T, protocol uint) {
 		defer app.Close()
 		defer net.Close()
 
-		peer := NewPeer(protocol, p2p.NewPeer(enode.ID{}, "peer", nil), net, nil)
+		peer := NewPeer(protocol, p2p.NewPeer(enode.ID{}, "peer", nil), net, nil, nil)
 		defer peer.Close()
 
 		// Send the junk test with one peer, check the handshake failure

eth/protocols/eth/peer.go

@@ -24,6 +24,7 @@ import (
 	mapset "github.com/deckarep/golang-set/v2"
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/core/types"
+	"github.com/ethereum/go-ethereum/crypto/kzg4844"
 	"github.com/ethereum/go-ethereum/p2p"
 	"github.com/ethereum/go-ethereum/p2p/tracker"
 	"github.com/ethereum/go-ethereum/rlp"
@@ -53,7 +54,8 @@ type Peer struct {
 	version   uint              // Protocol version negotiated
 	lastRange atomic.Pointer[BlockRangeUpdatePacket]
 
-	txpool      TxPool             // Transaction pool used by the broadcasters for liveness checks
+	txpool      TxPool // Transaction pool used by the broadcasters for liveness checks
+	blobpool    BlobPool
 	knownTxs    *knownCache        // Set of transaction hashes known to be known by this peer
 	txBroadcast chan []common.Hash // Channel used to queue transaction propagation requests
 	txAnnounce  chan []common.Hash // Channel used to queue transaction announcement requests
@@ -68,7 +70,7 @@ type Peer struct {
 
 // NewPeer creates a wrapper for a network connection and negotiated  protocol
 // version.
-func NewPeer(version uint, p *p2p.Peer, rw p2p.MsgReadWriter, txpool TxPool) *Peer {
+func NewPeer(version uint, p *p2p.Peer, rw p2p.MsgReadWriter, txpool TxPool, blobpool BlobPool) *Peer {
 	cap := p2p.Cap{Name: ProtocolName, Version: version}
 	id := p.ID().String()
 	peer := &Peer{
@@ -84,6 +86,7 @@ func NewPeer(version uint, p *p2p.Peer, rw p2p.MsgReadWriter, txpool TxPool) *Pe
 		reqCancel:   make(chan *cancel),
 		resDispatch: make(chan *response),
 		txpool:      txpool,
+		blobpool:    blobpool,
 		term:        make(chan struct{}),
 	}
 	// Start up all the broadcasters
@@ -166,10 +169,13 @@ func (p *Peer) AsyncSendTransactions(hashes []common.Hash) {
 // This method is a helper used by the async transaction announcer. Don't call it
 // directly as the queueing (memory) and transmission (bandwidth) costs should
 // not be managed directly.
-func (p *Peer) sendPooledTransactionHashes(hashes []common.Hash, types []byte, sizes []uint32) error {
+func (p *Peer) sendPooledTransactionHashes(hashes []common.Hash, types []byte, sizes []uint32, cells types.CustodyBitmap) error {
 	// Mark all the transactions as known, but ensure we don't overflow our limits
 	p.knownTxs.Add(hashes...)
-	return p2p.Send(p.rw, NewPooledTransactionHashesMsg, NewPooledTransactionHashesPacket{Types: types, Sizes: sizes, Hashes: hashes})
+	if p.version >= ETH71 {
+		return p2p.Send(p.rw, NewPooledTransactionHashesMsg, NewPooledTransactionHashesPacket71{Types: types, Sizes: sizes, Hashes: hashes, Mask: cells})
+	}
+	return p2p.Send(p.rw, NewPooledTransactionHashesMsg, NewPooledTransactionHashesPacket70{Types: types, Sizes: sizes, Hashes: hashes})
 }
 
 // AsyncSendPooledTransactionHashes queues a list of transactions hashes to eventually
@@ -222,6 +228,41 @@ func (p *Peer) ReplyReceiptsRLP(id uint64, receipts rlp.RawList[*ReceiptList]) e
 	})
 }
 
+// ReplyCells is the response to GetCells.
+func (p *Peer) ReplyCells(id uint64, hashes []common.Hash, cells [][]kzg4844.Cell, mask types.CustodyBitmap) error {
+	return p2p.Send(p.rw, CellsMsg, &CellsPacket{
+		RequestId: id,
+		CellsResponse: CellsResponse{
+			Hashes: hashes,
+			Cells:  cells,
+			Mask:   mask,
+		},
+	})
+}
+
+// RequestPayload fetches a batch of cells from a remote node.
+func (p *Peer) RequestPayload(hashes []common.Hash, cell *types.CustodyBitmap) error {
+	p.Log().Debug("Fetching batch of cells", "txcount", len(hashes), "cellcount", cell.OneCount())
+	id := rand.Uint64()
+
+	err := p.tracker.Track(tracker.Request{
+		ID:       id,
+		ReqCode:  GetCellsMsg,
+		RespCode: CellsMsg,
+		Size:     len(hashes),
+	})
+	if err != nil {
+		return err
+	}
+	return p2p.Send(p.rw, GetCellsMsg, &GetCellsRequestPacket{
+		RequestId: id,
+		GetCellsRequest: GetCellsRequest{
+			Hashes: hashes,
+			Mask:   *cell,
+		},
+	})
+}
+
 // RequestOneHeader is a wrapper around the header query functions to fetch a
 // single header. It is used solely by the fetcher.
 func (p *Peer) RequestOneHeader(hash common.Hash, sink chan *Response) (*Request, error) {

eth/protocols/eth/peer_test.go

@@ -45,7 +45,7 @@ func newTestPeer(name string, version uint, backend Backend) (*testPeer, <-chan
 	var id enode.ID
 	rand.Read(id[:])
 
-	peer := NewPeer(version, p2p.NewPeer(id, name, nil), net, backend.TxPool())
+	peer := NewPeer(version, p2p.NewPeer(id, name, nil), net, backend.TxPool(), backend.BlobPool())
 	errc := make(chan error, 1)
 	go func() {
 		defer app.Close()

eth/protocols/eth/protocol.go

@@ -24,12 +24,14 @@ import (
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/core/forkid"
 	"github.com/ethereum/go-ethereum/core/types"
+	"github.com/ethereum/go-ethereum/crypto/kzg4844"
 	"github.com/ethereum/go-ethereum/rlp"
 )
 
 // Constants to match up protocol versions and messages
 const (
 	ETH69 = 69
+	ETH71 = 71
 )
 
 // ProtocolName is the official short name of the `eth` protocol used during
@@ -38,11 +40,11 @@ const ProtocolName = "eth"
 
 // ProtocolVersions are the supported versions of the `eth` protocol (first
 // is primary).
-var ProtocolVersions = []uint{ETH69}
+var ProtocolVersions = []uint{ETH71, ETH69}
 
 // protocolLengths are the number of implemented message corresponding to
 // different protocol versions.
-var protocolLengths = map[uint]uint64{ETH69: 18}
+var protocolLengths = map[uint]uint64{ETH69: 18, ETH71: 20}
 
 // maxMessageSize is the maximum cap on the size of a protocol message.
 const maxMessageSize = 10 * 1024 * 1024
@@ -65,6 +67,8 @@ const (
 	GetReceiptsMsg                = 0x0f
 	ReceiptsMsg                   = 0x10
 	BlockRangeUpdateMsg           = 0x11
+	GetCellsMsg                   = 0x12
+	CellsMsg                      = 0x13
 )
 
 var (
@@ -230,13 +234,22 @@ type ReceiptsPacket struct {
 // ReceiptsRLPResponse is used for receipts, when we already have it encoded
 type ReceiptsRLPResponse []rlp.RawValue
 
-// NewPooledTransactionHashesPacket represents a transaction announcement packet on eth/68 and newer.
+// NewPooledTransactionHashesPacket70 represents a transaction announcement packet on eth/69.
-type NewPooledTransactionHashesPacket struct {
+type NewPooledTransactionHashesPacket70 struct {
 	Types  []byte
 	Sizes  []uint32
 	Hashes []common.Hash
 }
 
+// NewPooledTransactionHashesPacket71 represents a transaction announcement packet on eth/71
+// with an additional custody bitmap field for cell-based blob data availability.
+type NewPooledTransactionHashesPacket71 struct {
+	Types  []byte
+	Sizes  []uint32
+	Hashes []common.Hash
+	Mask   types.CustodyBitmap
+}
+
 // GetPooledTransactionsRequest represents a transaction query.
 type GetPooledTransactionsRequest []common.Hash
 
@@ -273,6 +286,31 @@ type BlockRangeUpdatePacket struct {
 	LatestBlockHash common.Hash
 }
 
+// GetCellsRequest represents a request for cells of blob transactions.
+type GetCellsRequest struct {
+	Hashes []common.Hash
+	Mask   types.CustodyBitmap
+}
+
+// GetCellsRequestPacket represents a cell request with request ID wrapping.
+type GetCellsRequestPacket struct {
+	RequestId uint64
+	GetCellsRequest
+}
+
+// CellsResponse represents a response containing cells for blob transactions.
+type CellsResponse struct {
+	Hashes []common.Hash
+	Cells  [][]kzg4844.Cell
+	Mask   types.CustodyBitmap
+}
+
+// CellsPacket represents a cells response with request ID wrapping.
+type CellsPacket struct {
+	RequestId uint64
+	CellsResponse
+}
+
 func (*StatusPacket) Name() string { return "Status" }
 func (*StatusPacket) Kind() byte   { return StatusMsg }
 
@@ -291,8 +329,11 @@ func (*GetBlockBodiesRequest) Kind() byte   { return GetBlockBodiesMsg }
 func (*BlockBodiesResponse) Name() string { return "BlockBodies" }
 func (*BlockBodiesResponse) Kind() byte   { return BlockBodiesMsg }
 
-func (*NewPooledTransactionHashesPacket) Name() string { return "NewPooledTransactionHashes" }
+func (*NewPooledTransactionHashesPacket70) Name() string { return "NewPooledTransactionHashes" }
-func (*NewPooledTransactionHashesPacket) Kind() byte   { return NewPooledTransactionHashesMsg }
+func (*NewPooledTransactionHashesPacket70) Kind() byte   { return NewPooledTransactionHashesMsg }
+
+func (*NewPooledTransactionHashesPacket71) Name() string { return "NewPooledTransactionHashes" }
+func (*NewPooledTransactionHashesPacket71) Kind() byte   { return NewPooledTransactionHashesMsg }
 
 func (*GetPooledTransactionsRequest) Name() string { return "GetPooledTransactions" }
 func (*GetPooledTransactionsRequest) Kind() byte   { return GetPooledTransactionsMsg }
@@ -311,3 +352,9 @@ func (*ReceiptsRLPResponse) Kind() byte   { return ReceiptsMsg }
 
 func (*BlockRangeUpdatePacket) Name() string { return "BlockRangeUpdate" }
 func (*BlockRangeUpdatePacket) Kind() byte   { return BlockRangeUpdateMsg }
+
+func (*GetCellsRequest) Name() string { return "GetCells" }
+func (*GetCellsRequest) Kind() byte   { return GetCellsMsg }
+
+func (*CellsResponse) Name() string { return "Cells" }
+func (*CellsResponse) Kind() byte   { return CellsMsg }

eth/sync_test.go

@@ -50,8 +50,8 @@ func testSnapSyncDisabling(t *testing.T, ethVer uint, snapVer uint) {
 	defer emptyPipeEth.Close()
 	defer fullPipeEth.Close()
 
-	emptyPeerEth := eth.NewPeer(ethVer, p2p.NewPeer(enode.ID{1}, "", caps), emptyPipeEth, empty.txpool)
+	emptyPeerEth := eth.NewPeer(ethVer, p2p.NewPeer(enode.ID{1}, "", caps), emptyPipeEth, empty.txpool, empty.blobpool)
-	fullPeerEth := eth.NewPeer(ethVer, p2p.NewPeer(enode.ID{2}, "", caps), fullPipeEth, full.txpool)
+	fullPeerEth := eth.NewPeer(ethVer, p2p.NewPeer(enode.ID{2}, "", caps), fullPipeEth, full.txpool, full.blobpool)
 	defer emptyPeerEth.Close()
 	defer fullPeerEth.Close()
 

tests/fuzzers/txfetcher/txfetcher_fuzzer.go

@@ -139,7 +139,7 @@ func fuzz(input []byte) int {
 			if verbose {
 				fmt.Println("Notify", peer, announceIdxs)
 			}
-			if err := f.Notify(peer, types, sizes, announces); err != nil {
+			if _, err := f.Notify(peer, types, sizes, announces); err != nil {
 				panic(err)
 			}