Node.js中用send-crypto通过WIF密钥发BTC遇ECPair错误求解决

一、修复现有send-crypto代码方案 #

你遇到的ECPair.fromWIF is not a function报错，是因为新版ecpair库需要依赖tiny-secp256k1初始化工厂实例，不能直接调用静态方法。同时send-crypto要求私钥为十六进制字符串，需要将WIF转换后的Buffer转为hex格式。

步骤1：安装依赖 #

npm install ecpair tiny-secp256k1

步骤2：修改代码 #

const bitcoin = require('bitcoinjs-lib');
const { ECPairFactory } = require('ecpair');
const tinysecp = require('tiny-secp256k1');
const CryptoAccount = require("send-crypto");

// 初始化ECPair工厂
const ECPair = ECPairFactory(tinysecp);

/* Load account from private key */
const privateKeyWIF = "L3fKJ...";
const keyPair = ECPair.fromWIF(privateKeyWIF);
// 将Buffer转为十六进制字符串，适配send-crypto要求
const privateKeyHex = keyPair.privateKey.toString('hex');
console.log(privateKeyHex);
const account = new CryptoAccount(privateKeyHex);

async function start() {
    console.log(await account.address("BTC"));

    console.log(await account.getBalance("BTC"));
    console.log(await account.getBalance("BTC", {address:"bc1qe6..."}));

    const balance = await account.getBalance("BTC");
    await account.send("bc1qe6...", balance, "BTC", {
            subtractFee: true,
    });
};
start();

二、无需send-crypto的替代方案（直接用bitcoinjs-lib实现转账） #

如果不想依赖send-crypto，可以直接用bitcoinjs-lib构建交易并通过公开区块链API广播，更灵活可控：

代码示例 #

const bitcoin = require('bitcoinjs-lib');
const axios = require('axios');
const { ECPairFactory } = require('ecpair');
const tinysecp = require('tiny-secp256k1');

const ECPair = ECPairFactory(tinysecp);
const privateKeyWIF = "L3fKJ...";
const keyPair = ECPair.fromWIF(privateKeyWIF);
const targetAddress = "bc1qe6...";

// 主网API地址，测试网替换为https://blockstream.info/testnet/api
const API_BASE = "https://blockstream.info/api";

async function getUtxos(address) {
    const response = await axios.get(`${API_BASE}/address/${address}/utxo`);
    return response.data;
}

async function getFeeRate() {
    // 获取半小时确认的费率（sat/vB）
    const response = await axios.get(`${API_BASE}/fee-estimates`);
    return response.data.halfHour;
}

async function sendBitcoin() {
    // 生成当前地址（P2WPKH格式）
    const address = bitcoin.payments.p2wpkh({ pubkey: keyPair.publicKey }).address;
    console.log("当前地址:", address);

    const utxos = await getUtxos(address);
    if (utxos.length === 0) {
        console.log("无可用UTXO，无法转账");
        return;
    }

    const feeRate = await getFeeRate();
    const psbt = new bitcoin.Psbt({ network: bitcoin.networks.bitcoin });

    let totalInput = 0;
    // 添加所有UTXO作为输入
    utxos.forEach(utxo => {
        psbt.addInput({
            hash: utxo.txid,
            index: utxo.vout,
            witnessUtxo: {
                script: Buffer.from(utxo.scriptpubkey, 'hex'),
                value: utxo.value
            }
        });
        totalInput += utxo.value;
    });

    // 估算交易大小并计算手续费
    const txSize = utxos.length * 141 + 31; // 简化估算：每个输入约141vB，输出约31vB
    const fee = txSize * feeRate;
    const sendAmount = totalInput - fee;

    if (sendAmount <= 0) {
        console.log("余额不足以支付手续费");
        return;
    }

    // 添加目标地址输出
    psbt.addOutput({
        address: targetAddress,
        value: sendAmount
    });

    // 签名所有输入
    utxos.forEach((_, index) => {
        psbt.signInput(index, keyPair);
    });

    // 完成签名并提取交易十六进制
    psbt.finalizeAllInputs();
    const txHex = psbt.extractTransaction().toHex();

    // 广播交易
    const response = await axios.post(`${API_BASE}/tx`, txHex);
    console.log("交易广播成功，TXID:", response.data);
}

sendBitcoin();

内容的提问来源于stack exchange，提问作者James