用C#开发自己的比特币钱包

在这个教程中,我们将使用C#来开发一个比特币钱包,我们使用 NBitcoin这个库。教程中的代码实现了比特币的存储、接收和支付功能, 可以很容易地移植到其他应用中。

如果要快速掌握NBitcoin的使用方法,推荐访问汇智网的课程:

开发目标

我们要开发的比特币钱包要实现以下功能:

  • 可以使用BIP39助记词恢复密钥
  • 可以创建比特地址,可以接收其他地址转来的比特币
  • 可以查看比特币地址余额
  • 可以向其他地址支付比特币

引入NBitcoin开发包

首先需要引入NBitcoin开发包以及QBitNinja开发包:

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using NBitcoin;
using QBitNinja.Client;
using QBitNinja.Client.Models;

生成BIP39助记词

我们需要保存下来生成的助记词:

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public void MssGenerateMnemo(out string ssMnemo) {

Mnemonic mnemonic = new Mnemonic(Wordlist.English, WordCount.Twelve);

ssMnemo = mnemonic.ToString();

}

生成比特币地址

下面的代码可以利用NBitcoin生成比特币HD地址:

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public void MssGenerateAddress(
string ssMnemo,
int ssKeynumber,
bool ssIsTestNet,
out string ssAddress,
out string ssPrivateKey) {

Network net;
if (ssIsTestNet)
net = Network.TestNet;
else
net = Network.Main;

Mnemonic restoreNnemo = new Mnemonic(ssMnemo);

ExtKey masterKey = restoreNnemo.DeriveExtKey();

KeyPath keypth = new KeyPath("m/44'/0'/0'/0/" + ssKeynumber);
ExtKey key = masterKey.Derive(keypth);

ssAddress = key.PrivateKey.PubKey.GetAddress(net).ToString();
ssPrivateKey = key.PrivateKey.GetBitcoinSecret(net).ToString();

}

获取比特币地址余额

下面的代码可以获取指定地址的比特币余额:

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public void MssGetBalance(
string ssAddress,
bool ssIsUnspentOnly,
bool ssIsTestNet,
out decimal ssBalance,
out decimal ssConfirmedBalance) {

Network net;
if (ssIsTestNet)
net = Network.TestNet;
else
net = Network.Main;

QBitNinjaClient client = new QBitNinjaClient(net);
var balance = client.GetBalance(new BitcoinPubKeyAddress(ssAddress), ssIsUnspentOnly).Result;

ssBalance = 0.0M;
ssConfirmedBalance = 0.0M;

if (balance.Operations.Count > 0)
{
var unspentCoins = new List<Coin>();
var unspentCoinsConfirmed = new List<Coin>();
foreach (var operation in balance.Operations)
{
unspentCoins.AddRange(operation.ReceivedCoins.Select(coin => coin as Coin));
if(operation.Confirmations > 0)
unspentCoinsConfirmed.AddRange(operation.ReceivedCoins.Select(coin => coin as Coin));

}

ssBalance = unspentCoins.Sum(x => x.Amount.ToDecimal(MoneyUnit.BTC));
ssConfirmedBalance = unspentCoinsConfirmed.Sum(x => x.Amount.ToDecimal(MoneyUnit.BTC));
}

}

向其他比特币地址转账

下面的代码可以利用NBitcoin实现向指定的地址转账比特币:

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public void MssGetBalance(
string ssAddress,
bool ssIsUnspentOnly,
bool ssIsTestNet,
out decimal ssBalance,
out decimal ssConfirmedBalance) {

Network net;
if (ssIsTestNet)
net = Network.TestNet;
else
net = Network.Main;

QBitNinjaClient client = new QBitNinjaClient(net);
var balance = client.GetBalance(new BitcoinPubKeyAddress(ssAddress), ssIsUnspentOnly).Result;

ssBalance = 0.0M;
ssConfirmedBalance = 0.0M;

if (balance.Operations.Count > 0)
{
var unspentCoins = new List<Coin>();
var unspentCoinsConfirmed = new List<Coin>();
foreach (var operation in balance.Operations)
{
unspentCoins.AddRange(operation.ReceivedCoins.Select(coin => coin as Coin));
if(operation.Confirmations > 0)
unspentCoinsConfirmed.AddRange(operation.ReceivedCoins.Select(coin => coin as Coin));

}

ssBalance = unspentCoins.Sum(x => x.Amount.ToDecimal(MoneyUnit.BTC));
ssConfirmedBalance = unspentCoinsConfirmed.Sum(x => x.Amount.ToDecimal(MoneyUnit.BTC));
}
}

原文:Step by step guide to programming your own bitcoin wallet

汇智网翻译整理,转载请标明出处