diff --git a/__crypto/simple_contract/src/main.rs b/__crypto/simple_contract/src/main.rs
index 340ef17..d422674 100644
--- a/__crypto/simple_contract/src/main.rs
+++ b/__crypto/simple_contract/src/main.rs
@@ -1,10 +1,10 @@
 #[macro_use] extern crate rust_util;
 
-pub mod util;
-pub mod tx;
-pub mod credit;
-pub mod engine;
-pub mod engine_plugin_credit;
+mod util;
+mod tx;
+mod credit;
+mod engine;
+mod engine_plugin_credit;
 
 mod cmd;
 mod cmd_default;
diff --git a/__crypto/simple_contract/src/tx.rs b/__crypto/simple_contract/src/tx.rs
index c51be5b..f2cf521 100644
--- a/__crypto/simple_contract/src/tx.rs
+++ b/__crypto/simple_contract/src/tx.rs
@@ -37,11 +37,7 @@ impl Transaction {
             signature: format!("{}", sign),
         })
     }
-
-    pub fn from_json(transaction_json: &str) -> XResult<Self> {
-        serde_json::from_str(transaction_json).map_err(|e| e.into())
-    }
-
+    
     pub fn parse_body(&self) -> XResult<TransactionBody> {
         serde_json::from_str(&self.body).map_err(|e| e.into())
     }