Refresh only if we need to

src/cutecoin/core/txhistory.py

@@ -370,7 +370,7 @@ class TxHistory():
                 block_from = min(set(blocks))
 
                 yield from self._wait_for_previous_refresh()
-
+                if block_from < current_block["number"]:
                     # Then we start a new one
                     logging.debug("Starts a new refresh")
                     task = asyncio.async(self._refresh(community, block_from, current_block, received_list))