code: def chain(self, block, count):
          
  
          block = self._process_value(block, 'block')
          count = self._process_value(count, 'int')
  
          payload = {"block": block, "count": count}
  
          resp = self.call('chain', payload)
  
          return resp.get('blocks') or []
docs: Returns a list of block hashes in the account chain starting at
          **block** up to **count**
  
          :param block: Block hash to start at
          :type block: str
  
          :param count: Number of blocks to return up to
          :type count: int
  
          :raises: :py:exc:`nano.rpc.RPCException`
  
          >>> rpc.chain(
          ...     block="000D1BAEC8EC208142C99059B393051BAC8380F9B5A2E6B2489A277D81789F3F",
          ...     count=1
          ... )
          [
              "000D1BAEC8EC208142C99059B393051BAC8380F9B5A2E6B2489A277D81789F3F"
          ]