用C#開發自己的比特幣錢包

在這個教程中，我們將使用C#來開發一個比特幣錢包，我們使用NBitcoin這個庫。教程中的代碼實現了比特幣的存儲、接收和支付功能，可以很容易地移植到其他應用中。

如果要快速掌握NBitcoin的使用方法，推薦訪問匯智網的課程：

• C#比特幣開發詳解

開發目標

我們要開發的比特幣錢包要實現以下功能：

• 可以使用BIP39助記詞恢復密鑰
• 可以創建比特地址，可以接收其他地址轉來的比特幣
• 可以查看比特幣地址余額
• 可以向其他地址支付比特幣

引入NBitcoin開發包

首先需要引入NBitcoin開發包以及QBitNinja開發包：

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

生成BIP39助記詞

我們需要保存下來生成的助記詞：

public void MssGenerateMnemo(out string ssMnemo) {

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

ssMnemo = mnemonic.ToString();

}

生成比特幣地址

下面的代碼可以利用NBitcoin生成比特幣HD地址：

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();

}

獲取比特幣地址余額

下面的代碼可以獲取指定地址的比特幣余額：

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));
  }

}

向其他比特幣地址轉賬

下面的代碼可以利用NBitcoin實現向指定的地址轉賬比特幣：

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

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