本页面使用机器翻译自英语，可能包含错误或不清楚的语言。如需最准确的信息，请参阅英文原文。由于更新频繁，部分内容可能与英文原文有出入。请加入我们在 Crowdin 上的努力，帮助我们改进本页面的翻译。 (Crowdin translation page, Contributing guide)

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

创建一个TxType.VALUE_TRANSFER_MEMO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value）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

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。

最后，得到结果。

ValueTransferWithMemo.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_value_transfer_with_memo_sign_recover():
    user = Account.from_key('0x0e4ca6d38096ad99324de0dde108587e5d7c600165ae4cd6c2462c597458c2b8')
    value_transfer_tx = empty_tx(TxType.VALUE_TRANSFER_MEMO)
    value_transfer_tx = merge(value_transfer_tx, {
        'from' : user.address,
        'to' : user.address,
        'value' : Web3.to_peb(0.1, 'klay'),
        'data' : b'TestMemoData'
    })
    value_transfer_tx = fill_transaction(value_transfer_tx, w3)
    # sign the kaia specific transaction type with web3py
    signed_tx = Account.sign_transaction(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)
    decoded_tx = Account.decode_transaction(signed_tx.rawTransaction)
    print("\ndecoded transaction:", to_pretty(decoded_tx))
    tx_hash = w3.eth.send_raw_transaction(signed_tx.rawTransaction)
    tx_receipt = w3.eth.wait_for_transaction_receipt(tx_hash)
    print('tx hash: ', tx_hash, 'receipt: ', tx_receipt)
web3_value_transfer_with_memo_sign_recover()

output


❯ node ValueTransferWithMemo.py
raw transaction of signed tx: 0x10f896820366850ba43b74008301042894a2a8854b1802d8cd5de631e690817c253d6a915388016345785d8a000094a2a8854b1802d8cd5de631e690817c253d6a91538c546573744d656d6f44617461f847f8458207f6a00daff49a09fbb8382654be6461d75e67def4d26442bf7bc8014da04d9d3b6f6da044fb682a3cd21e94e4dcf97cde1e0416d96dad2f15d353529a5db85873192c5b
recovered sender address 0xA2a8854b1802D8Cd5De631E690817c253d6a9153
decoded transaction: {
  "type": 16,
  "to": "0xA2a8854b1802D8Cd5De631E690817c253d6a9153",
  "value": 100000000000000000,
  "nonce": 870,
  "gasPrice": 50000000000,
  "gas": 66600,
  "from": "0xA2a8854b1802D8Cd5De631E690817c253d6a9153",
  "data": "0x546573744d656d6f44617461",
  "signatures": [
    {
      "v": 2038,
      "r": 6190953446910446010339588924128856456849311270962439470585054122192743919469,
      "s": 31201471237264490747209103173489052293037646153294155398956746212102253390939
    }
  ],
  "chainId": 1001
}
tx hash:  0x5b29f3dbc2f0d79dee4338a556eeb33c9d2dea9d0602882d44c307a2f25bce28 receipt:  AttributeDict({'blockHash': HexBytes('0x2ff2f47d724ccd645010adde8cebdb88edc4a31ffa415b34230f620544ecea6c'), 'blockNumber': 147340972, 'contractAddress': None, 'cumulativeGasUsed': 22200, 'effectiveGasPrice': 25000000000, 'from': '0xA2a8854b1802D8Cd5De631E690817c253d6a9153', 'gasUsed': 22200, 'logs': [], 'logsBloom': HexBytes('0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000'), 'status': 1, 'to': '0xA2a8854b1802D8Cd5De631E690817c253d6a9153', 'transactionHash': HexBytes('0x5b29f3dbc2f0d79dee4338a556eeb33c9d2dea9d0602882d44c307a2f25bce28'), 'transactionIndex': 0, 'type': 0})```