code: def _get_block_receipts(self, block_hash, num):
          
          number = _format_block_number(num)
          receipts_key = block_receipts_prefix + number + block_hash
          receipts_data = self.db.get(receipts_key)
          receipts = rlp.decode(receipts_data, sedes=CountableList(ReceiptForStorage))
          return receipts
docs: Get block transaction receipts by block header hash & number.
  
          :param block_hash:
          :param num:
          :return: