code: def verify(address, plaintext, scriptSigb64):
      
      assert isinstance(address, str)
      assert isinstance(scriptSigb64, str)
  
      scriptSig = base64.b64decode(scriptSigb64)
      hash_hex = hashlib.sha256(plaintext).hexdigest()
  
      vb = keylib.b58check.b58check_version_byte(address)
  
      if vb == bitcoin_blockchain.version_byte:
          return verify_singlesig(address, hash_hex, scriptSig)
      elif vb == bitcoin_blockchain.multisig_version_byte:
          return verify_multisig(address, hash_hex, scriptSig)
      else:
          log.warning("Unrecognized address version byte {}".format(vb))
          raise NotImplementedError("Addresses must be single-sig (version-byte = 0) or multi-sig (version-byte = 5)")
docs: Verify that a given plaintext is signed by the given scriptSig, given the address