Python3、以太坊——如何发送ERC20 Tokens？

Question

我有一些脚本用于将以太币从一个地址发送到另一个地址。我正在使用奇偶校验和 Python 3.6。它使用 Flask 看起来像：

from flask import Flask, render_template, json, request
import urllib
import requests
import binascii
from decimal import *
app = Flask(__name__)

def Eth(method,params=[]):
    data = {"method":method,"params":params,"id":1,"jsonrpc":"2.0"}
    headers = {'Content-type': 'application/json'}
    r = requests.post(ethrpc, data=json.dumps(data), headers=headers)
    r = r.text
    response = json.loads(r)
    return(response)
hot = str("XXXXXXX")
@app.route('/')
def index():
    ethnumbers = int(10)**int(18)
    hot = str("XXXXX")
    balance = Eth("eth_getBalance",[hot,'latest'])
    balance = balance["result"]
    balance = int(balance, 16)
    balance = float(balance)
    balance = balance / ethnumbers
    balance = str(balance)
    return render_template('index.html',hot = hot,balance=balance)


@app.route('/send/',methods=['POST','GET'])
def send():
    getcontext().prec = 28
    ethnumbers = Decimal(10)**Decimal(18)
    print(ethnumbers)
    if request.method == "POST":    
        _myaddress = request.form['_myaddress']
        _youraddress = request.form['_youraddress']
        _amount = request.form['_amount']
        _gas = request.form['_gas']
        _gas = hex(int(_gas))
        passy = str("XXXXXXXXX")
        getcontext().prec = 28
        _amount = Decimal(_amount)
        getcontext().prec = 28
        _amount = _amount * ethnumbers
        getcontext().prec = 28
        _amount = int(_amount)
        _amount = hex(_amount)
        r = [{'from':_myaddress,"to":_youraddress,"value":_amount,"gas":_gas,},str("XXXXXXXXXX!")]
        print(r)
        json.dumps(r)
        resultio = Eth("personal_sendTransaction",r)
        try: 
            resultio["result"]
            return render_template('sent.html',resultio=resultio["result"])
        except: KeyError
        return render_template('sent.html',resultio=resultio["error"]["message"])

    else:
        return render_template('index.html')







if __name__ == "__main__":
    app.run()

我很确定，我必须使用 "data" 来执行此操作，但我不知道如何通过此脚本发送 ERC20 令牌。代币交易的结构看起来像 "my address -> token address -> token receiver"。

有什么想法吗？

Answer 1

启动一个 geth 节点并向 JSON-RPC 接口发送一个 post 请求，例如：

data = {"method": "personal_sendTransaction",
        "params":[{
                   "from": "0xb60e8dd61c5d32be8058bb8eb970870f07233155",
                   "to": "0xd46e8dd67c5d32be8058bb8eb970870f07244567",
                   "gas": "0x76c0", // 30400
                   "gasPrice": "0x9184e72a000", // 10000000000000
                   "value": "0x9184e72a", // 2441406250
                   "data": "0xd46e8dd67c5d32be8d46e8dd67c5d32be8058bb8eb970870f072445675058bb8eb970870f072445675"}],
        "id":1,
        "jsonrpc":"2.0"
        }
headers = {'Content-type': 'application/json'}
r = requests.post('127.0.0.1:8545', data=json.dumps(data), headers=headers)

就代币合约而言，您需要找到部署合约的地址，查看 ABI，并确定您需要哪些信息才能调用 transfer令牌部署方法。

Answer 2

web3.py 绝对是正确的选择。如果你想手动做，你只想调用标准的 ERC-20 transfer 方法，from 地址应该保持不变，to 地址应该是代币合约, 然后 data 应该是以下连接在一起并格式化为十六进制的:

"transfer(address,uint256)" 的 keccak256 散列的前 4 个字节，这是函数的签名。
收件人地址，左补零为 32 字节。
转账金额。（一定要考虑 token 的小数点……1 个 token 通常是 10**18，但是小数位数因 token 而异，可以通过调用 decimals() 函数来检索。）这应该也被格式化为 32 字节的数字（所以左零填充）。

web3.py 会容易得多。 :-) 类似于：

web3.eth.contract(address, abi=standard_token_abi).sendTransaction({
    'from': from_address
}).transfer(to_address, amount)

Answer 3

伙计们，它比看起来更简单。你只需要输入：

contract address

作为接收者并制作一个长的"data"字段，它将字符串表示为：

// method name, its constans in erc20

0xa9059cbb

//receiver address (you have to do it without "0x" because its needed only when
//you have to tell "im using hexadecimal". You did it above, in method field.
//so, receiver address:

5b7b3b499fb69c40c365343cb0dc842fe8c23887

// and fill it with zeros, it have to be lenght 64. So fill rest of address 

0000000000000000000000005b7b3b499fb69c40c365343cb0dc842fe8c23887

// then you need amount, please convert it to hexadecimal, delete "0x" and 
// remember, you need to integer first, so if token has 18 "decimals" it need
// to be amount / 10**18 first!!
//1e27786570c272000 and fill that with zeros, like above:

000000000000000000000000000000000000000000000001e27786570c272000

//just add string, to string, to string, and you have data field: 

0xa9059cbb0000000000000000000000005b7b3b499fb69c40c365343cb0dc842fe8c23887000000000000000000000000000000000000000000000001e27786570c272000

示例交易：https://etherscan.io/tx/0x9c27df8af24e06edb819a8d7a380f548fad637de5edddd6155d15087d1619964

Python3、以太坊——如何发送ERC20 Tokens？

Python 3, Ethereum - how to send ERC20 Tokens?

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