[区块链]开发去中心化钱包

前言：关于区块链方面东西的自行了解，这里只说开发实现过程。

关系梳理：
1、助记词（bip39 生成） 推导出 私钥、公钥、地址。

2、使用 私钥、地址、utxo 等进行签名广播交易。

比特币示例：

'use strict'
const bitcoin = require('bitcoinjs-lib')
const bip39 = require('bip39')
var bip32 = require('bip32')

const wallet = {}

const network = bitcoin.networks.bitcoin //正式网络

// const network = bitcoin.networks.testnet //测试网络


// 通过助记词方式创建/导入钱包账号
wallet.mnemonicGenerate = function (words, callback) {
  try {
    let mnemonic = words || bip39.generateMnemonic()  //助记词
    let seed = bip39.mnemonicToSeedSync(mnemonic)   //种子
    let hash = bitcoin.crypto.sha256(mnemonic).toString('hex')  //与后台通信用

    let root = bip32.fromSeed(seed)
    let BTCroot = root.derivePath("m/44'/0'/0'/0/0")

    let hroot = bitcoin.HDNode.fromSeedHex(seed, network)
    let BTChroot = hroot.derivePath("m/44'/0'/0'/0/0")

    let store = {
      mnemonic,
      hash,
      BTC: {
        privateKey: BTCroot.toWIF(), //私钥
        publicKey: BTCroot.publicKey.toString('hex'), //公钥
        address: BTChroot.getAddress()  //地址
      }
    }
    console.log(store)

  } catch (err) {}
}

// 通过私钥推导出地址
wallet.privateKeyToAddress = function (privateKey, callback) {
  let hash = bitcoin.crypto.sha256(privateKey).toString('hex')
  let keyPair = new bitcoin.ECPair.fromWIF(privateKey, network)
  let address = keyPair.getAddress()
  let store = { 
    address,
    hash
  }
  callback(store)
}


module.exports = exports = wallet

签名

const bitcoin = require('bitcoinjs-lib');

function bitcoinSign(privateKey, amount, utxo, sendFee, toAddress, changeAddress) {
    if(!privateKey || !amount || !utxo || !sendFee || !toAddress || !changeAddress ) {
        console.log("one of privateKey, amount, utxo, sendFee, toAddress and changeAddress is null, please give a valid param");
    } else {
        console.log("param is valid, start sign transaction");
        set = bitcoin.ECPair.fromWIF(privateKey);
        txb = new bitcoin.TransactionBuilder();
        var sendAmount = parseFloat(amount);
        var fee = parseFloat(sendFee);
        sendAmount += fee;
        console.log(sendAmount)
        txb.setVersion(1);
        var totalMoney = 0;
        for(var i=0; i<utxo.length; i++){
            txb.addInput(utxo[i].tx_hash_big_endian, utxo[i].tx_output_n);
            totalMoney += utxo[i].value;
        }
        console.log(totalMoney)
        txb.addOutput(toAddress, sendAmount - fee);
        for(var i=0;i<utxo.length;i++){
            txb.sign(i, set);
        }
    }
    return txb.buildIncomplete().toHex();
}

var bitUtxo = {
    "unspent_outputs":[
        {
            "tx_hash":"8ee886ba0c66ba2df2c0e3da3beee526996d9a5e6bbbdfea43e1a78340cb0128",
            "tx_hash_big_endian":"2801cb4083a7e143eadfbb6b5e9a6d9926e5ee3bdae3c0f22dba660cba86e88e",
            "tx_index":382253932,
            "tx_output_n": 0,
            "script":"76a914ca45c6eceea7aed14b6aea7e0ed466c6134f14bc88ac",
            "value": 1899000,
            "value_hex": "1cf9f8",
            "confirmations":2
        }
    ]
}
var privateKey = "KwHEU8DTrY2ekGuqE6EqMMrcFj6Kdb6gWF4k8SpUeV7vDfc9c5Fn";
var amount = 1898000;
var utxo = bitUtxo.unspent_outputs;
var sendFee = 1000;
var toAddress = "12zEJohMNqSZLXH1Msxpw41ykkk3rxgx1s";
var changeAddress = "1KSX5wmrVax3LYaB4uKUxXzCRcv5SiLDq3";
var sign = bitcoinSign(privateKey, amount, bitUtxo.unspent_outputs, sendFee, toAddress, changeAddress);
console.log(sign);

let id = txb.buildIncomplete().getId()  // 签名id
let hash = txb.buildIncomplete().toHex()  //签名hash
// 01000000018ee886ba0c66ba2df2c0e3da3beee526996d9a5e6bbbdfea43e1a78340cb0128000000006a473044022050e857f867743a4306f9d94a40a7be1b7602351e30c4b8d65eabf48bd9d5cf4f0220789d8bcfb16996e62ebb37d18fddc29a1abb5e9cb66280b17f06655b870d4f6d0121020218415740e8ae879fc6b6837e4ab6e8c44d452c62f7e0f7bceb37ae1b13e685ffffffff0110f61c00000000001976a91415caf1976fc8334d4f2f071548d9cbace1a4517988ac00000000

附上一些参考文章希望对你们有帮助：

助记词结果验证

签名验证

比特币开发拓展

区块链了解

去中心化钱包详解

后续会写上以太坊开发