diff --git a/multi-service/ethqlite/src/crud.rs b/multi-service/ethqlite/src/crud.rs
index 292d33a..264973d 100644
--- a/multi-service/ethqlite/src/crud.rs
+++ b/multi-service/ethqlite/src/crud.rs
@@ -69,15 +69,27 @@ pub fn create_table(conn: &Connection) -> std::result::Result<(), fce_sqlite_con
     res
 }
 
-#[fce]
-pub fn update_reward_blocks(data_string: String) -> bool {
-    if AUTH.load(Ordering::Relaxed) && !is_owner() {
-        return false;
-    }
 
+#[fce]
+#[derive(Debug)]
+pub struct UpdateResult {
+    pub success: bool,
+    pub err_str: String,
+}
+
+#[fce]
+pub fn update_reward_blocks(data_string: String) -> UpdateResult {   
+    if !is_owner() {
+        return UpdateResult { success:false, err_str: "You are not the owner".into()};
+    }
+    
     let obj:serde_json::Value = serde_json::from_str(&data_string).unwrap();
     let obj = obj["result"].clone();
 
+    if obj["blockNumber"] == serde_json::Value::Null {
+        return UpdateResult { success:false, err_str: "Empty reward block string".into()};
+    }
+
     let conn = get_connection();
 
     let insert = "insert or ignore into reward_blocks values(?, ?, ?, ?)";
@@ -99,10 +111,10 @@ pub fn update_reward_blocks(data_string: String) -> bool {
             println!("select row {:?}", row);
             println!("{}, {}", row[0].as_integer().unwrap(), row[2].as_string().unwrap());
         }
-        return true;
+        return UpdateResult { success:true, err_str: "".into()};
     }
-    
-    false
+
+    UpdateResult { success:false, err_str: "Insert failed".into()}
 } 
 
 #[fce]
@@ -216,17 +228,3 @@ pub fn get_miner_rewards(miner_address: String) -> MinerRewards {
 
     miner_rewards
 }
-
-
-#[fce]
-#[derive(Debug)]
-pub struct UpdateResult {
-    pub success: bool,
-    pub err_str: String,
-}
-
-#[fce]
-pub fn update_balance(user_id: String, tx_id: String, chain_id:u32) -> bool {
-    // check balance 
-    true
-}
\ No newline at end of file
diff --git a/multi-service/ethqlite/src/main.rs b/multi-service/ethqlite/src/main.rs
index 3f3f248..e519bce 100644
--- a/multi-service/ethqlite/src/main.rs
+++ b/multi-service/ethqlite/src/main.rs
@@ -70,7 +70,7 @@ impl InitResult {
 }
 
 #[fce]
-pub fn init_service(is_auth:bool, is_paywall: bool, api_data: String) -> InitResult {
+pub fn init_service(is_auth:bool, api_data: String) -> InitResult {
 
     if INIT.load(Ordering::Relaxed) {
         return InitResult::error("Service already initiated".into());