diff --git a/documentation.swagger.json b/documentation.swagger.json
index 6f15b44..e273de9 100644
--- a/documentation.swagger.json
+++ b/documentation.swagger.json
@@ -1521,6 +1521,43 @@
         }
       }
     },
+    "modelMultiSignatureInfo": {
+      "type": "object",
+      "properties": {
+        "Addresses": {
+          "type": "array",
+          "items": {
+            "type": "string"
+          }
+        },
+        "MinimumSignatures": {
+          "type": "integer",
+          "format": "int64"
+        },
+        "Nonce": {
+          "type": "string",
+          "format": "int64"
+        }
+      }
+    },
+    "modelMultiSignatureTransactionBody": {
+      "type": "object",
+      "properties": {
+        "MultiSignatureInfo": {
+          "title": "MultiSignatureInfo represent the information of the multisig-address",
+          "$ref": "#/definitions/modelMultiSignatureInfo"
+        },
+        "SignatureInfo": {
+          "title": "List of participantAddress-participantSignature with its tx hash",
+          "$ref": "#/definitions/modelSignatureInfo"
+        },
+        "UnsignedTransactionBytes": {
+          "type": "string",
+          "format": "byte",
+          "title": "Unsigned transaction bytes that will be executed once the transaction is valid"
+        }
+      }
+    },
     "modelNode": {
       "type": "object",
       "title": "NodeInfo represent the node information data structure",
@@ -1836,6 +1873,22 @@
         }
       }
     },
+    "modelSignatureInfo": {
+      "type": "object",
+      "properties": {
+        "Signatures": {
+          "type": "object",
+          "additionalProperties": {
+            "type": "string",
+            "format": "byte"
+          }
+        },
+        "TransactionHash": {
+          "type": "string",
+          "format": "byte"
+        }
+      }
+    },
     "modelSkippedBlocksmith": {
       "type": "object",
       "properties": {
@@ -2034,6 +2087,9 @@
         "emptyTransactionBody": {
           "$ref": "#/definitions/modelEmptyTransactionBody"
         },
+        "multiSignatureTransactionBody": {
+          "$ref": "#/definitions/modelMultiSignatureTransactionBody"
+        },
         "nodeRegistrationTransactionBody": {
           "$ref": "#/definitions/modelNodeRegistrationTransactionBody"
         },
diff --git a/model/multiSignature.proto b/model/multiSignature.proto
new file mode 100644
index 0000000..1c18a2c
--- /dev/null
+++ b/model/multiSignature.proto
@@ -0,0 +1,15 @@
+syntax = "proto3";
+
+package model;
+option go_package = "github.com/zoobc/zoobc-core/common/model";
+
+message MultiSignatureInfo {
+    uint32 MinimumSignatures = 1;
+    int64 Nonce = 2 [ jstype = JS_STRING ];
+    repeated string Addresses = 3;
+}
+
+message SignatureInfo {
+    bytes TransactionHash = 1;
+    map<string, bytes> Signatures = 2; 
+}
diff --git a/model/transaction.proto b/model/transaction.proto
index aad1f3d..badfa97 100644
--- a/model/transaction.proto
+++ b/model/transaction.proto
@@ -8,6 +8,7 @@ import "model/pagination.proto";
 import "model/batchReceipt.proto";
 import "model/nodeRegistration.proto";
 import "model/escrow.proto";
+import "model/multiSignature.proto";
 
 // Transaction represent the transaction data structure stored in the database
 message Transaction {
@@ -35,10 +36,11 @@ message Transaction {
         SetupAccountDatasetTransactionBody setupAccountDatasetTransactionBody = 20;
         RemoveAccountDatasetTransactionBody removeAccountDatasetTransactionBody = 21;
         ApprovalEscrowTransactionBody approvalEscrowTransactionBody = 22;
+        MultiSignatureTransactionBody multiSignatureTransactionBody = 23;
     }
-    bytes Signature = 23;
+    bytes Signature = 24;
     // nullable
-    Escrow Escrow = 24;
+    Escrow Escrow = 25;
 }
 
 enum TransactionType {
@@ -60,6 +62,8 @@ enum TransactionType {
     RemoveAccountDatasetTransaction = 259;
     // in bytes: []byte{4,0,0,0}
     ApprovalEscrowTransaction = 4;  
+    // in bytes: []byte{5,0,0,0}
+    MultiSignatureTransaction = 5;
 }
 
 
@@ -125,6 +129,15 @@ message ApprovalEscrowTransactionBody {
     int64 TransactionID = 2 [ jstype = JS_STRING ];
 }
 
+message MultiSignatureTransactionBody {
+    // MultiSignatureInfo represent the information of the multisig-address
+    MultiSignatureInfo MultiSignatureInfo = 1;
+    // Unsigned transaction bytes that will be executed once the transaction is valid
+    bytes UnsignedTransactionBytes = 2;
+    // List of participantAddress-participantSignature with its tx hash
+    SignatureInfo SignatureInfo = 3;
+}
+
 //------------
 // P2P Content
 //------------