diff --git a/x/crosschain/client/cli/cli_cctx.go b/x/crosschain/client/cli/cli_cctx.go
index 070764ca44..2418efd536 100644
--- a/x/crosschain/client/cli/cli_cctx.go
+++ b/x/crosschain/client/cli/cli_cctx.go
@@ -166,6 +166,7 @@ func CmdCCTXInboundVoter() *cobra.Command {
 				250_000,
 				argsCoinType,
 				argsAsset,
+				0,
 			)
 			if err := msg.ValidateBasic(); err != nil {
 				return err
diff --git a/x/crosschain/client/integrationtests/cli_helpers.go b/x/crosschain/client/integrationtests/cli_helpers.go
index e86f1021c5..a1c536626f 100644
--- a/x/crosschain/client/integrationtests/cli_helpers.go
+++ b/x/crosschain/client/integrationtests/cli_helpers.go
@@ -201,6 +201,7 @@ func GetBallotIdentifier(message string) string {
 		250_000,
 		common.CoinType_Zeta,
 		"",
+		0,
 	)
 	return msg.Digest()
 }
diff --git a/x/crosschain/keeper/evm_hooks.go b/x/crosschain/keeper/evm_hooks.go
index c575598cf1..ebae270dc5 100644
--- a/x/crosschain/keeper/evm_hooks.go
+++ b/x/crosschain/keeper/evm_hooks.go
@@ -150,6 +150,7 @@ func (k Keeper) ProcessZRC20WithdrawalEvent(ctx sdk.Context, event *zrc20.ZRC20W
 		gasLimit.Uint64()+uint64(event.Raw.Index),
 		foreignCoin.CoinType,
 		foreignCoin.Asset,
+		0,
 	)
 	sendHash := msg.Digest()
 
@@ -223,6 +224,7 @@ func (k Keeper) ProcessZetaSentEvent(ctx sdk.Context, event *connectorzevm.ZetaC
 		90000+uint64(event.Raw.Index),
 		common.CoinType_Zeta,
 		"",
+		0,
 	)
 	sendHash := msg.Digest()
 
diff --git a/x/crosschain/types/message_vote_on_observed_inbound_tx.go b/x/crosschain/types/message_vote_on_observed_inbound_tx.go
index 12da3a6963..b94b0567a4 100644
--- a/x/crosschain/types/message_vote_on_observed_inbound_tx.go
+++ b/x/crosschain/types/message_vote_on_observed_inbound_tx.go
@@ -30,6 +30,7 @@ func NewMsgVoteOnObservedInboundTx(
 	gasLimit uint64,
 	coinType common.CoinType,
 	asset string,
+	eventIndex uint,
 ) *MsgVoteOnObservedInboundTx {
 	return &MsgVoteOnObservedInboundTx{
 		Creator:       creator,
@@ -45,6 +46,7 @@ func NewMsgVoteOnObservedInboundTx(
 		GasLimit:      gasLimit,
 		CoinType:      coinType,
 		Asset:         asset,
+		EventIndex:    uint64(eventIndex),
 	}
 }
 
diff --git a/x/crosschain/types/message_vote_on_observed_inbound_tx_test.go b/x/crosschain/types/message_vote_on_observed_inbound_tx_test.go
index 9fba3d71bb..777fb6f244 100644
--- a/x/crosschain/types/message_vote_on_observed_inbound_tx_test.go
+++ b/x/crosschain/types/message_vote_on_observed_inbound_tx_test.go
@@ -37,6 +37,7 @@ func TestMsgVoteOnObservedInboundTx_ValidateBasic(t *testing.T) {
 				GasLimit:      42,
 				CoinType:      common.CoinType_Zeta,
 				Asset:         sample.String(),
+				EventIndex:    42,
 			},
 		},
 		{
@@ -55,6 +56,7 @@ func TestMsgVoteOnObservedInboundTx_ValidateBasic(t *testing.T) {
 				GasLimit:      42,
 				CoinType:      common.CoinType_Zeta,
 				Asset:         sample.String(),
+				EventIndex:    42,
 			},
 			err: sdkerrors.ErrInvalidAddress,
 		},
@@ -74,6 +76,7 @@ func TestMsgVoteOnObservedInboundTx_ValidateBasic(t *testing.T) {
 				GasLimit:      42,
 				CoinType:      common.CoinType_Zeta,
 				Asset:         sample.String(),
+				EventIndex:    42,
 			},
 			err: types.ErrInvalidChainID,
 		},
@@ -93,6 +96,7 @@ func TestMsgVoteOnObservedInboundTx_ValidateBasic(t *testing.T) {
 				GasLimit:      42,
 				CoinType:      common.CoinType_Zeta,
 				Asset:         sample.String(),
+				EventIndex:    42,
 			},
 			err: types.ErrInvalidChainID,
 		},
@@ -112,6 +116,7 @@ func TestMsgVoteOnObservedInboundTx_ValidateBasic(t *testing.T) {
 				GasLimit:      42,
 				CoinType:      common.CoinType_Zeta,
 				Asset:         sample.String(),
+				EventIndex:    42,
 			},
 			err: sdkerrors.ErrInvalidRequest,
 		},
@@ -145,6 +150,7 @@ func TestMsgVoteOnObservedInboundTx_Digest(t *testing.T) {
 		GasLimit:      42,
 		CoinType:      common.CoinType_Zeta,
 		Asset:         sample.String(),
+		EventIndex:    42,
 	}
 	hash := msg.Digest()
 	require.NotEmpty(t, hash, "hash should not be empty")
@@ -226,4 +232,10 @@ func TestMsgVoteOnObservedInboundTx_Digest(t *testing.T) {
 	msg2.Asset = sample.StringRandom(r, 32)
 	hash2 = msg2.Digest()
 	require.NotEqual(t, hash, hash2, "asset should change hash")
+
+	// event index used
+	msg2 = msg
+	msg2.EventIndex = 43
+	hash2 = msg2.Digest()
+	require.NotEqual(t, hash, hash2, "event index should change hash")
 }
diff --git a/zetaclient/tx.go b/zetaclient/tx.go
index d5d9c89571..307d8e1681 100644
--- a/zetaclient/tx.go
+++ b/zetaclient/tx.go
@@ -31,8 +31,38 @@ const (
 	DefaultRetryInterval            = 5
 )
 
-func GetInBoundVoteMessage(sender string, senderChain int64, txOrigin string, receiver string, receiverChain int64, amount math.Uint, message string, inTxHash string, inBlockHeight uint64, gasLimit uint64, coinType common.CoinType, asset string, signerAddress string) *types.MsgVoteOnObservedInboundTx {
-	msg := types.NewMsgVoteOnObservedInboundTx(signerAddress, sender, senderChain, txOrigin, receiver, receiverChain, amount, message, inTxHash, inBlockHeight, gasLimit, coinType, asset)
+// GetInBoundVoteMessage returns a new MsgVoteOnObservedInboundTx
+func GetInBoundVoteMessage(
+	sender string,
+	senderChain int64,
+	txOrigin string,
+	receiver string,
+	receiverChain int64,
+	amount math.Uint,
+	message string,
+	inTxHash string,
+	inBlockHeight uint64,
+	gasLimit uint64,
+	coinType common.CoinType,
+	asset string,
+	signerAddress string,
+) *types.MsgVoteOnObservedInboundTx {
+	msg := types.NewMsgVoteOnObservedInboundTx(
+		signerAddress,
+		sender,
+		senderChain,
+		txOrigin,
+		receiver,
+		receiverChain,
+		amount,
+		message,
+		inTxHash,
+		inBlockHeight,
+		gasLimit,
+		coinType,
+		asset,
+		0,
+	)
 	return msg
 }