historian / transaction updates

src/historian.rs

@@ -53,7 +53,7 @@ impl Historian {
     }
 
     pub fn receive(self: &Self) -> Result<Entry, TryRecvError> {
-        self.output.lock().unwrap().try_recv()
+        self.output.lock().expect("failed 'output' lock in Historian").try_recv()
     }
 }
 

src/transaction.rs

@@ -70,7 +70,7 @@ impl Transaction {
     }
 
     fn get_sign_data(&self) -> Vec<u8> {
-        serialize(&(&self.data)).expect("failed to serialize sign_data")
+        serialize(&(&self.data)).expect("failed on serialize TransactionData")
     }
 
     /// Sign this transaction.