diff --git a/pkg/contracts/preconf/preconf.go b/pkg/contracts/preconf/preconf.go
index 328b8c9..dfdd9c7 100644
--- a/pkg/contracts/preconf/preconf.go
+++ b/pkg/contracts/preconf/preconf.go
@@ -128,11 +128,11 @@ func (p *preconfContract) OpenCommitment(
 	callData, err := p.preconfABI.Pack(
 		"openCommitment",
 		eciBytes,
-		bidAmt,
-		big.NewInt(blockNumber),
+		bidAmt.Uint64(),
+		big.NewInt(blockNumber).Uint64(),
 		txnHash,
-		big.NewInt(decayStartTimeStamp),
-		big.NewInt(decayEndTimeStamp),
+		big.NewInt(decayStartTimeStamp).Uint64(),
+		big.NewInt(decayEndTimeStamp).Uint64(),
 		bidSignature,
 		commitmentSignature,
 		sharedSecretKey,
@@ -142,7 +142,7 @@ func (p *preconfContract) OpenCommitment(
 		return common.Hash{}, err
 	}
 
-	_, err = p.client.Send(ctx, &evmclient.TxRequest{
+	txHash, err := p.client.Send(ctx, &evmclient.TxRequest{
 		To:       &p.preconfContractAddr,
 		CallData: callData,
 	})
@@ -150,5 +150,5 @@ func (p *preconfContract) OpenCommitment(
 		return common.Hash{}, err
 	}
 
-	return common.Hash{}, fmt.Errorf("commitmentIndex not found in transaction receipt")
+	return txHash, nil
 }
diff --git a/pkg/preconfirmation/preconfirmation.go b/pkg/preconfirmation/preconfirmation.go
index a79f5fc..d18ce07 100644
--- a/pkg/preconfirmation/preconfirmation.go
+++ b/pkg/preconfirmation/preconfirmation.go
@@ -352,7 +352,7 @@ func (p *Preconfirmation) HandleNewL1BlockEvent(ctx context.Context, event block
 	p.logger.Info("New L1 Block event received", "blockNumber", event.BlockNumber, "winner", event.Winner, "window", event.Window)
 	// todo: for provider check if winner == providerAddress, for bidder if committerAddress
 	for _, commitment := range p.commitmentByBlockNumber[event.BlockNumber.Int64()] {
-		_, err := p.commitmentDA.OpenCommitment(
+		txHash, err := p.commitmentDA.OpenCommitment(
 			ctx,
 			commitment.EncryptedPreConfirmation.CommitmentIndex,
 			commitment.PreConfirmation.Bid.BidAmount,
@@ -368,7 +368,7 @@ func (p *Preconfirmation) HandleNewL1BlockEvent(ctx context.Context, event block
 			p.logger.Error("Failed to open commitment", "error", err)
 			continue
 		} else {
-			p.logger.Info("Opened commitment", "txHash", commitment.PreConfirmation.Bid.TxHash)
+			p.logger.Info("Opened commitment", "txHash", txHash)
 		}
 	}
 	delete(p.commitmentByBlockNumber, event.BlockNumber.Int64())