diff --git a/crypto.go b/crypto.go
index 1c0a93a..20e878f 100644
--- a/crypto.go
+++ b/crypto.go
@@ -13,7 +13,7 @@ import (
 )
 
 type BaseMessage struct {
-	Signature string
+	Signature string `json:"signature"`
 }
 
 func (it *BaseMessage) GetSignature() string {