亚马逊托管区块链入门 (AMB) 访问比特币

以下示例显示了如何使用获取有关 00000000c983704af73704af28acdec37b049d214adbda81d7e2a3dd14a3dd146f6ed09 blockhash 的信息。getBlock RPC用您自己的输入替换突出显示的变量，或者选择列出的其他RPC方法之一，然后输入所需的相关输入。

使用签名版本 4 (Sigv4) 使用您的IAM用户凭证签署请求，以便拨打比特币 JSON-RPC 调用 A AMB ccess Bitcoin 端点。a wscurl 命令行工具可以帮助你签署请求 AWS 使用 Sigv4 的服务。有关更多信息，请参阅 awscur README l .md。

使用适合您的操作系统的方法安装 awscurl。在 macOS 上，推荐 HomeBrew使用以下应用程序：

brew install awscurl

如果您已经安装并配置了 AWS CLI，您的IAM用户凭证和默认AWS区域是在您的环境中设置的，并且可以访问 awscurl。使用 awscurl，通过调用，向比特币主网和测试网提交请求。getblock RPC此调用接受与您要检索其信息的区块哈希相对应的字符串参数。

以下命令使用params数组中的区块哈希来选择要检索标头的特定区块，从而从比特币主网上检索区块头数据。此示例使用us-east-1终端节点。你可以用你喜欢的比特币代替它 JSON-RPC 而且 AWS Amazon Managed Blockchain (AMB) 支持的区域访问比特币。此外，您可以通过在命令中替换mainnet为，向测试网网络而不是主网发出请求。testnet

awscurl -X POST -d '{ "jsonrpc": "1.0", "id": "getblockheader-curltest", "method": "getblockheader", "params": ["0000000000000000000105bebab2f9dd16234a30950d38ec6ddc24d466e750a0"] }' --service managedblockchain https://mainnet.bitcoin.managedblockchain.us-east-1.amazonaws.com  --region us-east-1 -k

结果包括区块标头中的详细信息以及请求区块中包含的交易哈希列表。请参见以下示例：

{"result":{"hash":"0000000000000000000105bebab2f9dd16234a30950d38ec6ddc24d466e750a0",
      "confirmations":2,"height":799243,"version":664485888,"versionHex":"279b4000",
      "merkleroot":"568e79752e1921ecf40c961435abb41bc5700fe2833ecadc4abfc2f615ddc1b8",
      "time":1689684290,"mediantime":1689681317,"nonce":2091174943,"bits":"17053894",
      "difficulty":53911173001054.59,
      "chainwork":"00000000000000000000000000000000000000004f375cf72ff64e2404c1589c",
      "nTx":2135,
      "previousblockhash":"00000000000000000002ffe4efe07ae74ec8b92c7696f5e12b5da506f015ba6b",
      "nextblockhash":"000000000000000000038f05ddcf3f483fdcb74f4be606c022bcb673424fa4ca"},
      "error":null,"id":"curltest"}

要运行此示例 Node.js 脚本，请应用以下先决条件：

完成所有先决条件后，使用编辑器将以下package.json文件和index.js脚本复制到本地环境中：

包裹.json

{
  "name": "bitcoin-rpc",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "",
  "license": "ISC",
  "dependencies": {
    "@aws-crypto/sha256-js": "^4.0.0",
    "@aws-sdk/credential-provider-node": "^3.360.0",
    "@aws-sdk/protocol-http": "^3.357.0",
    "@aws-sdk/signature-v4": "^3.357.0",
    "axios": "^1.4.0"
  }
}

index.js

const axios = require('axios');
const SHA256 = require('@aws-crypto/sha256-js').Sha256
const defaultProvider = require('@aws-sdk/credential-provider-node').defaultProvider
const HttpRequest = require('@aws-sdk/protocol-http').HttpRequest
const SignatureV4 = require('@aws-sdk/signature-v4').SignatureV4

// define a signer object with AWS service name, credentials, and region
const signer = new SignatureV4({
  credentials: defaultProvider(),
  service: 'managedblockchain',
  region: 'us-east-1',
  sha256: SHA256,
});


const rpcRequest = async () => {

  // create a remote procedure call (RPC) request object definig the method, input params
  let rpc = {
    jsonrpc: "1.0", 
    id: "1001", 
    method: 'getblock', 
    params: ["00000000c937983704a73af28acdec37b049d214adbda81d7e2a3dd146f6ed09"]
  }
  
  //bitcoin endpoint
  let bitcoinURL = 'https://mainnet.bitcoin.managedblockchain.us-east-1.amazonaws.com/';
  
  // parse the URL into its component parts (e.g. host, path)
  const url = new URL(bitcoinURL);
  
  // create an HTTP Request object
  const req = new HttpRequest({
    hostname: url.hostname.toString(),
    path: url.pathname.toString(),
    body: JSON.stringify(rpc),
    method: 'POST',
    headers: {
      'Content-Type': 'application/json',
      'Accept-Encoding': 'gzip',
      host: url.hostname,
    }
  });

  
  // use AWS SignatureV4 utility to sign the request, extract headers and body
  const signedRequest = await signer.sign(req, { signingDate: new Date() });
  
  try {
    //make the request using axios
    const response = await axios({...signedRequest, url: bitcoinURL, data: req.body})

    console.log(response.data)
  } catch (error) {
    console.error('Something went wrong: ', error)
    throw error
  } 

 
}

rpcRequest();

前面的示例代码使用 Axios 向比特币端点发出RPC请求，并使用官方的 Signature Version 4 (Sigv4) 标头使用相应的签名版本 4 (Sigv4) 标头对这些请求进行签名 AWS SDKv3 工具。要运行代码，请在文件所在目录下打开终端，然后运行以下命令：

npm i
node index.js

生成的结果将类似于以下内容：

{"hash":"00000000c937983704a73af28acdec37b049d214adbda81d7e2a3dd146f6ed09","
    confirmations":784126,"height":1000, "version":1,"versionHex":"00000001",
    "merkleroot":"fe28050b93faea61fa88c4c630f0e1f0a1c24d0082dd0e10d369e13212128f33",
    "time":1232346882,
    "mediantime":1232344831,"nonce":2595206198,"bits":"1d00ffff","difficulty":1,
    "chainwork":"000000000000000000000000000000000000000000000000000003e903e903e9",
    "nTx":1,
    "previousblockhash":"0000000008e647742775a230787d66fdf92c46a48c896bfbc85cdc8acc67e87d",
    "nextblockhash":"00000000a2887344f8db859e372e7e4bc26b23b9de340f725afbf2edb265b4c6",
    "strippedsize":216,"size":216,"weight":864,
    "tx":["fe28050b93faea61fa88c4c630f0e1f0a1c24d0082dd0e10d369e13212128f33"]},
    "error":null,"id":"1001"}