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价值转移备忘录

TxTypeValueTransferMemo 用于用户发送带有特定信息的 KAIA。

从web3py_ext导入extend，将 web3 扩展为 kaia web3

从 eth_account、web3py_ext 和 cytoolz 中导入必要的实用程序

使用指定的 kairos 测试网 URL 创建 Web3 实例

此外，您还可以将提供商 URL 从 kairos 更改为 quicknode

从私人密钥加载账户

用私人密钥加载缴费账户

创建一个TxType.FEE_DELEGATED_SMART_CONTRACT_EXECUTION类型的空事务。您可以使用 empty_tx 工具来获取已填写默认字段的 tx。

使用 merge 工具将附加字段（如from、to和data）合并到空 tx 中。

您可以使用 Web3.to_peb 工具来转换十进制数值。

特别是以二进制格式写下要在数据字段中记录的内容

使用 fill_transaction 为交易对象添加更多参数，如 gas 限制...

用用户的私人密钥签署值传输 tx

从已签署的 tx 中的签名中恢复签名人地址

作为费用支付人签署交易。

从签署的交易中找回缴费人地址.

您可以使用Account.decode_transaction工具对 RLP 编码的 tx 进行解码，如果您想让输出格式更漂亮，请使用to_pretty工具。

向区块链发送 tx。它将返回 tx 哈希值，用于等待接收

如果交易已在区块链中完成，wait_for_transaction_receipt 方法会返回交易收据。

FeeDelegatedValueTransferMemo.py


from web3py_ext import extend
from web3 import Web3
from eth_account import Account
from web3py_ext.transaction.transaction import (
    empty_tx,
    fill_transaction,
    TxType
)
from web3py_ext.utils.klaytn_utils import to_pretty
from cytoolz import merge
w3 = Web3(Web3.HTTPProvider('https://public-en-kairos.node.kaia.io'))
def web3_fee_delegated_value_transfer_with_memo_sign_recover():
    user = Account.from_key('0x0e4ca6d38096ad99324de0dde108587e5d7c600165ae4cd6c2462c597458c2b8')
    fee_delegator = Account.from_key('0x9435261ed483b6efa3886d6ad9f64c12078a0e28d8d80715c773e16fc000cff4')
    fee_delegated_value_transfer_tx = empty_tx(TxType.FEE_DELEGATED_VALUE_TRANSFER_MEMO)
    fee_delegated_value_transfer_tx = merge(fee_delegated_value_transfer_tx, {
        'from' : user.address,
        'to' : user.address,
        'value' : Web3.to_peb(0.1, 'klay'),
        'data' : 'memo'.encode(encoding='utf-8').hex(),
    })
    fee_delegated_value_transfer_tx = fill_transaction(fee_delegated_value_transfer_tx, w3)
    # sign the kaia specific transaction type with web3py
    signed_tx = Account.sign_transaction(fee_delegated_value_transfer_tx, user.key)
    print("\nraw transaction of signed tx:", signed_tx.rawTransaction.hex())
    recovered_tx = Account.recover_transaction(signed_tx.rawTransaction)
    print("\nrecovered sender address", recovered_tx)
    feepayer_signed_tx = Account.sign_transaction_as_feepayer(signed_tx.rawTransaction, fee_delegator.address, fee_delegator.key)
    print("\nraw transaction of signed tx:", feepayer_signed_tx.rawTransaction.hex())
    feepayer_recovered_tx = Account.recover_transaction_as_feepayer(feepayer_signed_tx.rawTransaction)
    print("recovered feepayer address:", feepayer_recovered_tx)
    decoded_tx = Account.decode_transaction(feepayer_signed_tx.rawTransaction)
    print("\ndecoded transaction:", to_pretty(decoded_tx))
    tx_hash = w3.eth.send_raw_transaction(feepayer_signed_tx.rawTransaction)
    tx_receipt = w3.eth.wait_for_transaction_receipt(tx_hash)
    print('tx hash: ', tx_hash, 'receipt: ', tx_receipt)
web3_fee_delegated_value_transfer_with_memo_sign_recover()

output


❯ python FeeDelegatedValueTransferMemo.py
raw transaction of signed tx: 0x11f88d8203a2850ba43b740082fac894a2a8854b1802d8cd5de631e690817c253d6a915388016345785d8a000094a2a8854b1802d8cd5de631e690817c253d6a9153846d656d6ff847f8458207f5a03d5781735b63e147a6cdb4c5f4d9371b87a776ed6b2460997799cf82a4c5dc6ca07beeefc1f5ccd72a994e65b8fa5cbafda79046383530d2d81c5e128bb6032c5c
recovered sender address 0xA2a8854b1802D8Cd5De631E690817c253d6a9153
raw transaction of signed tx: 0x11f8eb8203a2850ba43b740082fac894a2a8854b1802d8cd5de631e690817c253d6a915388016345785d8a000094a2a8854b1802d8cd5de631e690817c253d6a9153846d656d6ff847f8458207f5a03d5781735b63e147a6cdb4c5f4d9371b87a776ed6b2460997799cf82a4c5dc6ca07beeefc1f5ccd72a994e65b8fa5cbafda79046383530d2d81c5e128bb6032c5c94cb0eb737dfda52756495a5e08a9b37aab3b271daf847f8458207f6a050f32b7e60dd18c6ff122f6bdc94f831b5912de7e1cfb6b291b8a2458ccdbe69a03153156ec7a8bbb51dbcb0d40a717cdc31173ef748f6803418af26b66e40e57f
recovered feepayer address: ['0xCb0eb737dfda52756495A5e08A9b37AAB3b271dA']
decoded transaction: {
  "type": 17,
  "to": "0xA2a8854b1802D8Cd5De631E690817c253d6a9153",
  "value": 100000000000000000,
  "nonce": 930,
  "gasPrice": 50000000000,
  "gas": 64200,
  "from": "0xA2a8854b1802D8Cd5De631E690817c253d6a9153",
  "data": "0x6d656d6f",
  "feePayer": "0xCb0eb737dfda52756495A5e08A9b37AAB3b271dA",
  "signatures": [
    {
      "v": 2037,
      "r": 27745692893512078622955272339665478959198598054588520658281796167915765357676,
      "s": 56056644723691388895475112662977851531398597373084653396908548095691232324700
    }
  ],
  "feePayerSignatures": [
    {
      "v": 2038,
      "r": 36614671905649584459785163916244052559136997622248050659604331627579687419497,
      "s": 22310125810250633785807423340835226393398279220715112280506580747244212905343
    }
  ],
  "chainId": 1001
}
tx hash:  0xe9d6214c30b433cd7bb3bc3a37afad86fba4b4153bbc08607a44b390fd015c36 receipt:  AttributeDict({'blockHash': HexBytes('0xdcc51fb57ca4d010ea14d46a18d1ad1eabf9fef90b2fe002902796f59ed3a4dc'), 'blockNumber': 148223370, 'contractAddress': None, 'cumulativeGasUsed': 31400, 'effectiveGasPrice': 25000000000, 'from': '0xA2a8854b1802D8Cd5De631E690817c253d6a9153', 'gasUsed': 31400, 'logs': [], 'logsBloom': HexBytes('0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000'), 'status': 1, 'to': '0xA2a8854b1802D8Cd5De631E690817c253d6a9153', 'transactionHash': HexBytes('0xe9d6214c30b433cd7bb3bc3a37afad86fba4b4153bbc08607a44b390fd015c36'), 'transactionIndex': 0, 'type': 0})