docs: def sign_create_withdrawal(withdrawal_params, key_pair):
      """
      Function to create the withdrawal request by signing the parameters necessary for withdrawal.
      Execution of this function is as follows::
  
          sign_create_withdrawal(withdrawal_params=signable_params, private_key=eth_private_key)
  
      The expected return result for this function is as follows::
  
          {
              'blockchain': 'neo',
              'asset_id': 'SWTH',
              'amount': '100',
              'timestamp': 1542090737236,
              'contract_hash': 'a195c1549e7da61b8da315765a790ac7e7633b82',
              'address': 'fea2b883725ef2d194c9060f606cd0a0468a2c59',
              'signature': 'f66d604c0a80940bf70ce9e13c0fd47bc79de....'
          }
  
      :param withdrawal_params: Dictionary specifications for withdrawal from the Switcheo Smart Contract.
      :type withdrawal_params: dict
      :param key_pair: The NEO key pair to be used to sign messages for the NEO Blockchain.
      :type key_pair: KeyPair
      :return: Dictionary of parameters to be sent to the Switcheo API
      """
      encoded_message = encode_message(withdrawal_params)
      create_params = withdrawal_params.copy()
      create_params['address'] = neo_get_scripthash_from_private_key(private_key=key_pair.PrivateKey).ToString()
      create_params['signature'] = sign_message(encoded_message=encoded_message,
                                                private_key_hex=private_key_to_hex(key_pair=key_pair))
      return create_params