diff --git a/auth/v1/msg.proto b/auth/v1/msg.proto
index 4e7216f..a481d74 100644
--- a/auth/v1/msg.proto
+++ b/auth/v1/msg.proto
@@ -212,7 +212,7 @@ message TFAReq {
   optional string mobile = 2;
   optional string email = 3;
   optional string reason = 4; // issued jwt reason -> can be login, redeem, withdrawal
-  optional string transaction_id = 5;
+  optional int64 transaction_id = 5;
   optional TfaStateEnum state = 6;
 }
 
@@ -235,7 +235,7 @@ message CheckTFAReq {
 message TFA {
   TfaStateEnum state = 1;
   int64 code = 2;
-  string transaction_id = 3;
+  int64 transaction_id = 3;
 }
 
 enum TfaStateEnum {
diff --git a/wallet/v1/msg.proto b/wallet/v1/msg.proto
index 7e8dc72..d18e005 100644
--- a/wallet/v1/msg.proto
+++ b/wallet/v1/msg.proto
@@ -350,7 +350,7 @@ message TransferAssetRes {
   auth.v1.Recipient recipient = 1;
   double amount = 2;
   // TODO: Change to Asset
-  string transaction_id = 3;
+  int64 transaction_id = 3;
   string transaction_hash = 4;
 }