基于Mixin Network的 Nodejs 比特币开发教程: 创建比特币钱包

我们已经创建过一个回复消息的机器人和一个能自动支付比特币的机器人.

通过本教程的学习，你可以学到如下内容

1. 如何创建一个比特币钱包.
2. 如何读取比特币钱包的余额.
3. 如何支付比特币并即时确认.
4. 如何将Mixin Network的比特币提现到你的冷钱包或第三方交易所.

前期准备：你要有一个Mixin Network账户。下面的代码创建一个帐号，并写到csv文件里。

console.log("create wallet ....");
const { generateKeyPairSync } = require('crypto');
const { publicKey, privateKey } = generateKeyPairSync('rsa',
{   modulusLength: 1024,  // the length of your key in bits
    publicKeyEncoding: {
      type: 'spki',       // recommended to be 'spki' by the Node.js docs
      format: 'pem'
    },
    privateKeyEncoding: {
      type: 'pkcs1',      // recommended to be 'pkcs8' by the Node.js docs
      format: 'pem',
      //cipher: 'aes-256-cbc',   // *optional*
      //passphrase: 'top secret' // *optional*
  }
});
publicKey1 = publicKey.replace("-----BEGIN PUBLIC KEY-----","");
publicKey2 = publicKey1.replace("-----END PUBLIC KEY-----","");
publicKey3 = publicKey2.replace(/\r?\n|\r/g, "");

console.log(publicKey);
console.log(publicKey3);
(async () => {
  const info = await clientBot.createUser({full_name : "nodejs bitcoin wallet",
                                        session_secret: publicKey3,
                                      });

上面的语句会在本地创建一个RSA密钥对，然后调用Mixin Network来创建帐号，最后保存帐号信息到csv文件.

let aesKey = '';
  const privateKeyBytes = pem.decode(Buffer.from(privateKey));
  const aesKeyBuffer = await oaepDecrypt(
    Buffer.from(info.pin_token, 'base64'),
    privateKeyBytes,
    'SHA-256',
    Buffer.from(info.session_id)
  );
  aesKey = Buffer.from(aesKeyBuffer).toString('base64');
  console.log(aesKey);

  var csvStream = csv.createWriteStream({headers: false, ignoreEmpty: true}),
      writableStream = fs.createWriteStream(WalletName, {flags: 'a'});

  writableStream.on("finish", function(){
    console.log("Bitcoin wallet DONE!");
  });
  csvStream.pipe(writableStream);
  csvStream.write({a: privateKey, b: info.pin_token,
                   c: info.session_id, d: info.user_id,
                   e: "123456"}
                 );
  csvStream.end();
  fs.appendFile(WalletName, require("os").EOL, function(){});

  const newUserConfig = {clientId: info.user_id, aesKey: aesKey,
                         privateKey: privateKey, sessionId: info.session_id,
                         clientSecret: "do not need", assetPin: "123456"};
  console.log(newUserConfig);
  const newUserClient = new HttpClient(newUserConfig);
  var info2 = await newUserClient.updatePin({oldPin : "",
                                             newPin: "123456",
                                           });
  console.log(info2);

  const verifyPin = await newUserClient.verifyPin("123456");
  console.log({ verifyPin });

现在你需要小心保管好你的帐号信息，在读取该账户的比特币资产余额或者进行其他操作时，将需要用到这些信息.

给新建的帐号创建一个比特币钱包

新账号并不默认内置比特币钱包， 现在读一下比特币余额就可以创建一个比特币钱包。

const assetInfo = await newUserClient.getUserAsset(BTC_ASSET_ID);
  console.log("Bitcoin address is ", assetInfo.public_key);
  console.log("Bitcoin balance is ", assetInfo.balance);
  console.log("Bitcoin price is (USD) ", assetInfo.price_usd);

创建的帐号的比特币资产详细信息如下，其中public key就是比特币的存币地址:

Make your choose(select the uuid for open the specified wallet): 0b10471b-1aed-3944-9eda-5ab947562761
   You select the : 0b10471b-1aed-3944-9eda-5ab947562761
  You select the wallet 0b10471b-1aed-3944-9eda-5ab947562761
  ?
  Make your choose 1: Read Bitcoin Balance & Address
  You choice to : { type: '1: Read Bitcoin Balance & Address' }
  You wallet is : 0b10471b-1aed-3944-9eda-5ab947562761
  Bitcoin address is  15MySY7UnA827TRMQWuCKGiogCYXUmt21M
  Bitcoin balance is  0
  Bitcoin price is (USD)  5029.59915767
   You select the : 0b10471b-1aed-3944-9eda-5ab947562761
  You select the wallet 0b10471b-1aed-3944-9eda-5ab947562761

这个API能够提供若干与比特币有关的信息:

• 存币地址:[public_key]
• Logo: [icon_url]
• 资产名字:[name]
• 资产在Mixin Network的uuid: [asset_key]
• 对美元的价格(Coinmarketcap.com提供): [price_usd]
• 存币时确认的区块数量:[confirmations]

比特币私钥呢？

比特币的私钥呢？这个私钥被Mixin Network通过多重签名保护，所以对用户来说是不可见的,比特币资产的提现和转账都需要用户提供正确的的RSA签名,PIN代码与会话密钥才能完成.

不只是比特币，还有以太坊，EOS等

这个帐号不只支持比特币，还支持以太坊，EOS等, 完整的区块链支持列表. 这个账户同时也支持所有的 ERC20 代币与 EOS 代币.

创建其它的币的钱包与创建比特币钱包过程一样，读对应的资产余额就可以.

Mixin Network 当前支持的加密货币 (2019-02-19)

EOS的存币地址与其它的币有些不同，它由两部分组成： account_name and account tag, 如果你向Mixin Network存入EOS，你需要填两项数据： account name 是eoswithmixin,备注里输入你的account_tag,比如0aa2b00fad2c69059ca1b50de2b45569.

EOS的资产余额返回结果如下:

Make your choose 3: Read EOS Balance & Address
  You choice to : { type: '3: Read EOS Balance & Address' }
  You wallet is : 0b10471b-1aed-3944-9eda-5ab947562761
  EOS account name is  eoswithmixin  tag is  30f0c36057b9b22151173b309bd0d79c
  EOS balance is  0
  EOS price is (USD)  5.26225922
   You select the : 0b10471b-1aed-3944-9eda-5ab947562761
  You select the wallet 0b10471b-1aed-3944-9eda-5ab947562761

存入比特币与读取比特币余额

现在，你可以向比特币的钱包存币了。

当然，在比特币网络里转币，手续费是相当贵的，费用的中位数在0.001BTC,按当前4000美元的价格，在4美元左右，有一个方便的办法，如果你有Mixin Messenger帐号，里面并且有比特币的话，可以直接提现比特币到新创建的帐号的比特币充值地址，它们在同一个Mixin Network网络内，手续费为0，而且1秒到账。

下面的代码，可以读取比特币钱包余额.

const assetInfo = await newUserClient.getUserAsset(BTC_ASSET_ID);
  console.log("Bitcoin address is ", assetInfo.public_key);
  console.log("Bitcoin balance is ", assetInfo.balance);
  console.log("Bitcoin price is (USD) ", assetInfo.price_usd);

Mixin Network网内免手续费的，并且即时确认

任何币在Mixin Network内部的交易，都是无手续费的，并且立刻到账。
前期准备： 账户设置了PIN

对于新创建的帐号，我们通过updatePin来设置新PIN码, 代码如下：

var info2 = await newUserClient.updatePin({oldPin : "",
                                             newPin: "123456",
                                           });
  console.log(info2);

  const verifyPin = await newUserClient.verifyPin("123456");
  console.log({ verifyPin });

Mixin Network帐号之间的比特币支付

通过Mixin Messenger，我们可以先转比特币给机器人，然后让机器人转币给新用户。

const assetInfo = await newUserClient.getUserAsset(EOS_ASSET_ID);
  console.log("The Wallet 's EOS balance is ", assetInfo.balance);
  if ( assetInfo.balance > 0 ) {
    const Obj = {
      assetId: BTC_ASSET_ID,
      recipientId: MASTER_UUID,
        traceId: newUserClient.getUUID(),
        amount: assetInfo.balance,
        memo: '',
    };
    console.log(Obj);
    newUserClient.transferFromBot(Obj);
  }

读取Bitcoin的余额，来确认比特币是不是转成功了！ 注意newUserClient是新用户的。

const assetInfo = await newUserClient.getUserAsset(BTC_ASSET_ID);
  console.log("Bitcoin address is ", assetInfo.public_key);
  console.log("Bitcoin balance is ", assetInfo.balance);

如何将比特币存入你的冷钱包或者第三方交易所

如果你希望将币存入你的冷钱包或者第三方交易所, 先要得到冷钱包或者你在第三方交易所的钱包地址，然后将钱包地址提交到Mixin Network.

• 要点提示: 提现是需要支付收续费的,准备好比特币包地址!

增加目的钱包地址到Mixin Network

调用createAddress API, 将会返回一个address_id,下一步的提现操作会用到这个id。

const withdrawAddress = await newUserClient.createWithdrawAddress({
    assetId: BTC_ASSET_ID,
    label: 'BTC withdraw',
    publicKey: BTC_WALLET_ADDR,
  });

这里的 14T129GTbXXPGXXvZzVaNLRFPeHXD1C25C 就是一个比特币钱包地址, 如下所示，提现费用是0.0025738 BTC, address_id 是"345855b5-56a5-4f3b-ba9e-d99601ef86c1".

Make your choose 9: BTC withdraw
You choice to : { type: '9: BTC withdraw' }
You wallet is : 0b10471b-1aed-3944-9eda-5ab947562761
{ type: 'address',
  address_id: 'a513da38-a18a-4536-abe4-d1c29ca3a1a8',
  asset_id: 'c6d0c728-2624-429b-8e0d-d9d19b6592fa',
  public_key: '14T129GTbXXPGXXvZzVaNLRFPeHXD1C25C',
  label: 'BTC withdraw',
  account_name: '',
  account_tag: '',
  fee: '0.00212232',
  reserve: '0',
  dust: '0.0001',
  updated_at: '2019-04-04T02:20:42.552274992Z' }
? Input you BTC amount:

创建提现地址成功后，你可以用readAddress读取最新的提现费。

const addressList = await newUserClient.getWithdrawAddress(BTC_ASSET_ID);
  console.log(addressList);

提交提现请求，Mixin Network会即时处理提现请求.

提交提现请求到 Mixin Network, withdrawAddress.address_id 就是createAddress创建的。

console.log(withdrawAddress);
  const prompts = [
    {
      name: 'amount',
      type: 'input',
      message: "Input you BTC amount: ",
    },
  ];
  const answers = await inquirer.prompt(prompts);
  console.log(answers);
  const withdrawResult = await newUserClient.withdraw({
    addressId: withdrawAddress.address_id,
    assetId: BTC_ASSET_ID,
    amount: answers.amount,
    memo: 'withdraw by nodejs',
  });
  console.log(withdrawResult);

可以通过blockchain explore来查看进度.

完整的代码在这儿