diff --git a/data/transaction.go b/data/transaction.go
index 975c6945..aa71295b 100644
--- a/data/transaction.go
+++ b/data/transaction.go
@@ -11,24 +11,24 @@ import (
 // Transaction represents the structure that maps and validates user input for publishing a new transaction
 type Transaction struct {
 	// This field is used to tag transactions for send-multiple route
-	Index             int            `json:"-"`
-	Nonce             uint64         `json:"nonce"`
-	Value             string         `json:"value"`
-	Receiver          string         `json:"receiver"`
-	Sender            string         `json:"sender"`
-	SenderUsername    []byte         `json:"senderUsername,omitempty"`
-	ReceiverUsername  []byte         `json:"receiverUsername,omitempty"`
-	GasPrice          uint64         `json:"gasPrice"`
-	GasLimit          uint64         `json:"gasLimit"`
-	Data              []byte         `json:"data,omitempty"`
-	Signature         string         `json:"signature,omitempty"`
-	ChainID           string         `json:"chainID"`
-	Version           uint32         `json:"version"`
-	Options           uint32         `json:"options,omitempty"`
-	GuardianAddr      string         `json:"guardian,omitempty"`
-	GuardianSignature string         `json:"guardianSignature,omitempty"`
-	Relayer           string         `json:"relayer,omitempty"`
-	InnerTransactions []*Transaction `json:"innerTransactions,omitempty"`
+	Index             int          `json:"-"`
+	Nonce             uint64       `json:"nonce"`
+	Value             string       `json:"value"`
+	Receiver          string       `json:"receiver"`
+	Sender            string       `json:"sender"`
+	SenderUsername    []byte       `json:"senderUsername,omitempty"`
+	ReceiverUsername  []byte       `json:"receiverUsername,omitempty"`
+	GasPrice          uint64       `json:"gasPrice"`
+	GasLimit          uint64       `json:"gasLimit"`
+	Data              []byte       `json:"data,omitempty"`
+	Signature         string       `json:"signature,omitempty"`
+	ChainID           string       `json:"chainID"`
+	Version           uint32       `json:"version"`
+	Options           uint32       `json:"options,omitempty"`
+	GuardianAddr      string       `json:"guardian,omitempty"`
+	GuardianSignature string       `json:"guardianSignature,omitempty"`
+	Relayer           string       `json:"relayer,omitempty"`
+	InnerTransaction  *Transaction `json:"innerTransaction,omitempty"`
 }
 
 // GetTransactionResponseData follows the format of the data field of get transaction response