# 附录D：Bitcore

Bitcore是BitPay提供的一套工具。 其目标是为Bitcoin开发人员提供易于使用的工具。 几乎所有的Bitcore的代码都是用JavaScript编写的。 有一些专门为NodeJS编写的模块。 最后，Bitcore的“节点”模块包括Bitcoin Core的C ++代码。 有关详细信息，请参阅[https://bitcore.io](https://bitcore.io/)。

## Bitcore的功能列表

* Bitcoin full node (bitcore-node)  
* Block explorer (insight) 
* Block, transaction, and wallet utilities (bitcore-lib)
* Communicating directly with Bitcoin’s P2P network (bitcore-p2p)
* Seed entropy mnemonic generation（种子熵助记符） (bitcore-mnemonic)
* Payment protocol (bitcore-payment-protocol)
* Message verification and signing (bitcore-message)
* Elliptic curve Integrated Encryption Scheme（椭圆曲线综合加密方案） (bitcore-ecies)
* Wallet service (bitcore-wallet-service)
* Wallet client (bitcore-wallet-client)
* Integrating services directly with Bitcoin Core (bitcore-node)

## Bitcore库示例

### 先决条件

* NodeJS >= 4.x 

如果使用NodeJS和节点REPL：

```
$ npm install -g bitcore-lib bitcore-p2p
```

### 使用bitcore-lib的钱包示例

使用关联的私钥创建新的比特币地址：

```
> bitcore = require('bitcore-lib')
> privateKey = new bitcore.PrivateKey()
> address = privateKey.toAddress().toString()
```

创建分层确定性私钥和地址：

```
> hdPrivateKey = bitcore.HDPrivateKey()
> hdPublicKey = bitcore.HDPublicKey(hdPrivateKey)
> hdAddress = new bitcore.Address(hdPublicKey.publicKey).toString()
```

从UTXO创建和签署交易：

```
> utxo = {
  txId: transaction id containing an unspent output,
  outputIndex: output index e.g. 0,
  address: addressOfUtxo,
  script: bitcore.Script.buildPublicKeyHashOut(addressOfUtxo).toString(),
  satoshis: amount sent to the address
}
> fee = 3000 //set appropriately for conditions on the network
> tx = new bitcore.Transaction()
        .from(utxo)
        .to(address, 35000)
        .fee(fee)
        .enableRBF()
        .sign(privateKeyOfUtxo)
```

替换mempool中的最后一个交易（替换费）：

```
> rbfTx = new Transaction()
           .from(utxo)
           .to(address, 35000)
           .fee(fee*2)
           .enableRBF()
           .sign(privateKeyOfUtxo);
> tx.serialize();
> rbfTx.serialize();
```

将交易广播到比特币网络（注意：仅广播有效交易;请参阅<https://bitnodes.21.co/nodes>）：\
1.将以下代码复制到名为broadcast.js的文件中。\
2.tx和rbfTx变量分别是tx.serialize（）和rbfTx.serialize（）的输出。\
3.为了更换费用，对等端必须支持bitcoind选项mempoolreplace并将其设置为1。\
4.运行文件节点broadcast.js：

```
var p2p = require('bitcore-p2p');
var bitcore = require('bitcore-lib');
var tx = new bitcore.Transaction('output from serialize function');
var rbfTx = new bitcore.Transaction('output from serialize function');
var host = 'ip address'; //use valid peer listening on tcp 8333
var peer = new p2p.Peer({host: host});
var messages = new p2p.Messages();
peer.on('ready', function() {
  var txs = [messages.Transaction(tx), messages.Transaction(rbfTx)];
  var index = 0;
  var interval = setInterval(function() {
    peer.sendMessage(txs[index++]);
    console.log('tx: ' + index + ' sent');
    if (index === txs.length) {
      clearInterval(interval);
      console.log('disconnecting from peer: ' + host);
      peer.disconnect();
    }
  }, 2000);
});
peer.connect();
```


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://lusuzi.gitbook.io/bitcoinbook/appdx-bitcore.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.