docs: def check_tx(self, tx) -> ResponseCheckTx:
          """
          Validate the Tx before entry into the mempool
          Checks the txs are submitted in order 1,2,3...
          If not an order, a non-zero code is returned and the tx
          will be dropped.
          """
          value = decode_number(tx)
          if not value == (self.txCount + 1):
              # respond with non-zero code
              return ResponseCheckTx(code=1)
          return ResponseCheckTx(code=CodeTypeOk)