diff --git a/pkg/store/store.go b/pkg/store/store.go
index 4104662..12a6802 100644
--- a/pkg/store/store.go
+++ b/pkg/store/store.go
@@ -13,7 +13,7 @@ import (
 var settlementsTable = `
 CREATE TABLE IF NOT EXISTS settlements (
     commitment_index BYTEA PRIMARY KEY,
-    transaction VARCHAR(255),
+    transaction TEXT,
     block_number BIGINT,
     builder_address BYTEA,
     is_slash BOOLEAN,
diff --git a/pkg/updater/updater.go b/pkg/updater/updater.go
index 16ced6f..c547907 100644
--- a/pkg/updater/updater.go
+++ b/pkg/updater/updater.go
@@ -5,6 +5,7 @@ import (
 	"errors"
 	"fmt"
 	"math/big"
+	"strings"
 
 	"github.com/ethereum/go-ethereum"
 	"github.com/ethereum/go-ethereum/common"
@@ -118,9 +119,9 @@ func (u *Updater) Start(ctx context.Context) <-chan struct{} {
 						return fmt.Errorf("failed to get block by number: %w", err)
 					}
 
-					txnsInBlock := make(map[string]struct{})
-					for _, tx := range blk.Transactions() {
-						txnsInBlock[tx.Hash().Hex()] = struct{}{}
+					txnsInBlock := make(map[string]int)
+					for posInBlock, tx := range blk.Transactions() {
+						txnsInBlock[tx.Hash().Hex()] = posInBlock
 					}
 
 					commitmentIndexes, err := u.preconfClient.GetCommitmentsByBlockNumber(
@@ -144,7 +145,16 @@ func (u *Updater) Start(ctx context.Context) <-chan struct{} {
 						}
 
 						if commitment.Commiter.Cmp(builderAddr) == 0 {
-							_, ok := txnsInBlock[commitment.TxnHash]
+							commitmentTxnHashes := strings.Split(commitment.TxnHash, ",")
+							ok := true
+
+							// Ensure Bundle is atomic and present in the block
+							for i := 0; i < len(commitmentTxnHashes) && ok; i++ {
+								if newPos, found := txnsInBlock[commitmentTxnHashes[i]]; !found || newPos != txnsInBlock[commitmentTxnHashes[0]]+i {
+									ok = false
+									break
+								}
+							}
 							err = u.winnerRegister.AddSettlement(
 								ctx,
 								index[:],
diff --git a/pkg/updater/updater_test.go b/pkg/updater/updater_test.go
index c2c92cf..263eca3 100644
--- a/pkg/updater/updater_test.go
+++ b/pkg/updater/updater_test.go
@@ -73,12 +73,28 @@ func TestUpdater(t *testing.T) {
 	commitments := make(map[string]preconf.PreConfCommitmentStorePreConfCommitment)
 	for i, txn := range txns {
 		idxBytes := getIdxBytes(int64(i))
+
 		commitments[string(idxBytes[:])] = preconf.PreConfCommitmentStorePreConfCommitment{
 			Commiter: builderAddr,
 			TxnHash:  txn.Hash().Hex(),
 		}
 	}
 
+	// constructing bundles
+	for i := 0; i < 10; i++ {
+		idxBytes := getIdxBytes(int64(i + 10))
+
+		bundle := txns[i].Hash().Hex()
+		for j := i + 1; j < 10; j++ {
+			bundle += "," + txns[j].Hash().Hex()
+		}
+
+		commitments[string(idxBytes[:])] = preconf.PreConfCommitmentStorePreConfCommitment{
+			Commiter: builderAddr,
+			TxnHash:  bundle,
+		}
+	}
+
 	testWinnerRegister := &testWinnerRegister{
 		winners:     make(chan updater.BlockWinner),
 		settlements: make(chan testSettlement),
@@ -117,7 +133,7 @@ func TestUpdater(t *testing.T) {
 
 	count := 0
 	for {
-		if count == 10 {
+		if count == 20 {
 			break
 		}
 		settlement := <-testWinnerRegister.settlements
@@ -147,6 +163,112 @@ func TestUpdater(t *testing.T) {
 	}
 }
 
+func TestUpdaterBundlesFailure(t *testing.T) {
+	t.Parallel()
+
+	key, err := crypto.GenerateKey()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	builderAddr := common.HexToAddress("0xabcd")
+
+	signer := types.NewLondonSigner(big.NewInt(5))
+	var txns []*types.Transaction
+	for i := 0; i < 10; i++ {
+		txns = append(txns, types.MustSignNewTx(key, signer, &types.DynamicFeeTx{
+			Nonce:     uint64(i + 1),
+			Gas:       1000000,
+			Value:     big.NewInt(1),
+			GasTipCap: big.NewInt(500),
+			GasFeeCap: big.NewInt(500),
+		}))
+	}
+
+	commitments := make(map[string]preconf.PreConfCommitmentStorePreConfCommitment)
+	// constructing bundles
+	for i := 1; i < 10; i++ {
+		idxBytes := getIdxBytes(int64(i))
+
+		bundle := txns[i].Hash().Hex()
+		for j := 10 - i; j > 0; j-- {
+			bundle += "," + txns[j].Hash().Hex()
+		}
+
+		commitments[string(idxBytes[:])] = preconf.PreConfCommitmentStorePreConfCommitment{
+			Commiter: builderAddr,
+			TxnHash:  bundle,
+		}
+	}
+
+	testWinnerRegister := &testWinnerRegister{
+		winners:     make(chan updater.BlockWinner),
+		settlements: make(chan testSettlement),
+		done:        make(chan int64, 1),
+	}
+
+	testL1Client := &testL1Client{
+		blockNum: 5,
+		block:    types.NewBlock(&types.Header{}, txns, nil, nil, NewHasher()),
+	}
+
+	testOracle := &testOracle{
+		builder:     "test",
+		builderAddr: builderAddr,
+	}
+
+	testPreconf := &testPreconf{
+		blockNum:    5,
+		commitments: commitments,
+	}
+
+	updtr := updater.NewUpdater(
+		testL1Client,
+		testWinnerRegister,
+		testOracle,
+		testPreconf,
+	)
+
+	ctx, cancel := context.WithCancel(context.Background())
+	done := updtr.Start(ctx)
+
+	testWinnerRegister.winners <- updater.BlockWinner{
+		BlockNumber: 5,
+		Winner:      "test",
+	}
+
+	count := 0
+	for {
+		if count == 9 {
+			break
+		}
+		settlement := <-testWinnerRegister.settlements
+		if settlement.blockNum != 5 {
+			t.Fatal("wrong block number")
+		}
+		if settlement.builder != "test" {
+			t.Fatal("wrong builder")
+		}
+		if !settlement.isSlash {
+			t.Fatal("should be slash")
+		}
+		count++
+	}
+
+	select {
+	case <-testWinnerRegister.done:
+	case <-time.After(5 * time.Second):
+		t.Fatal("timeout")
+	}
+
+	cancel()
+	select {
+	case <-done:
+	case <-time.After(5 * time.Second):
+		t.Fatal("timeout")
+	}
+}
+
 type testSettlement struct {
 	commitmentIdx []byte
 	txHash        string