diff --git a/models/transaction.go b/models/transaction.go
index 67d9363..69c2d06 100644
--- a/models/transaction.go
+++ b/models/transaction.go
@@ -5,6 +5,21 @@ import (
 	"time"
 )
 
+const TxTypeSend = 1
+const TxTypeSellCoin = 2
+const TxTypeSellAllCoin = 3
+const TxTypeBuyCoin = 4
+const TxTypeCreateCoin = 5
+const TxTypeDeclareCandidacy = 6
+const TxTypeDelegate = 7
+const TxTypeUnbound = 8
+const TxTypeRedeemCheck = 9
+const TxTypeSetCandidateOnline = 10
+const TxTypeSetCandidateOffline = 11
+const TxTypeMultiSig = 12
+const TxTypeMultiSend = 13
+const TxTypeEditCandidate = 14
+
 type Transaction struct {
 	ID            uint64               `json:"id" pg:",pk"`
 	FromAddressID uint64               `json:"from_address_id"`