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appdx-bitcore.html
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</div>
<div id="content">
<div class="sect1 data-line-4">
<h2 id="appdx_bitcore">Appendix A: Bitcore</h2>
<div class="sectionbody">
<div class="paragraph data-line-7">
<p>Bitcore is a suite of tools provided by BitPay. Its goal is to provide easy-to-use tools for Bitcoin developers. Almost all of Bitcore’s code is written in JavaScript. There are some modules written specifically for NodeJS. Finally, the "node" module of Bitcore includes Bitcoin Core’s C++ code. Please see <a href="https://bitcore.io" class="undefined" data-href="https://bitcore.io">https://bitcore.io</a> for more information.</p>
</div>
<div class="sect2 data-line-9">
<h3 id="_bitcores_feature_list">Bitcore’s Feature List</h3>
<div class="ulist data-line-11">
<ul>
<li class="data-line-11">
<p>Bitcoin full node (bitcore-node)</p>
</li>
<li class="data-line-12">
<p>Block explorer (insight)</p>
</li>
<li class="data-line-13">
<p>Block, transaction, and wallet utilities (bitcore-lib)</p>
</li>
<li class="data-line-14">
<p>Communicating directly with Bitcoin’s P2P network (bitcore-p2p)</p>
</li>
<li class="data-line-15">
<p>Seed entropy mnemonic generation (bitcore-mnemonic)</p>
</li>
<li class="data-line-16">
<p>Payment protocol (bitcore-payment-protocol)</p>
</li>
<li class="data-line-17">
<p>Message verification and signing (bitcore-message)</p>
</li>
<li class="data-line-18">
<p>Elliptic curve Integrated Encryption Scheme (bitcore-ecies)</p>
</li>
<li class="data-line-19">
<p>Wallet service (bitcore-wallet-service)</p>
</li>
<li class="data-line-20">
<p>Wallet client (bitcore-wallet-client)</p>
</li>
<li class="data-line-21">
<p>Playground (bitcore-playground)</p>
</li>
<li class="data-line-22">
<p>Integrating services directly with Bitcoin Core (bitcore-node)</p>
</li>
</ul>
</div>
</div>
<div class="sect2 data-line-24">
<h3 id="_bitcore_library_examples">Bitcore Library Examples</h3>
<div class="sect3 data-line-26">
<h4 id="_prerequisities">Prerequisities</h4>
<div class="ulist data-line-28">
<ul>
<li class="data-line-28">
<p>NodeJS >= 4.x or use our <a href="https://bitcore.io/playground" data-href="https://bitcore.io/playground">hosted online playground</a></p>
</li>
</ul>
</div>
<div class="paragraph data-line-30">
<p>If using NodeJS and the node REPL:</p>
</div>
<div class="listingblock data-line-33">
<div class="content">
<pre class="highlight"><code class="language-bash" data-lang="bash">$ npm install -g bitcore-lib bitcore-p2p
$ NODE_PATH=$(npm list -g | head -1)/node_modules node</code></pre>
</div>
</div>
</div>
<div class="sect3 data-line-38">
<h4 id="_wallet_examples_using_bitcore_lib">Wallet Examples using bitcore-lib</h4>
<div class="paragraph data-line-40">
<p>Creating a new bitcoin address with associated private key:</p>
</div>
<div class="listingblock data-line-42">
<div class="content">
<pre>> bitcore = require('bitcore-lib')
> privateKey = new bitcore.PrivateKey()
> address = privateKey.toAddress().toString()</pre>
</div>
</div>
<div class="paragraph data-line-48">
<p>Creating a hierarchical deterministic private key and address:</p>
</div>
<div class="listingblock data-line-50">
<div class="content">
<pre>> hdPrivateKey = bitcore.HDPrivateKey()
> hdPublicKey = bitcore.HDPublicKey(hdPrivateKey)
> hdAddress = new bitcore.Address(hdPublicKey.publicKey).toString()</pre>
</div>
</div>
<div class="paragraph data-line-56">
<p>Creating and signing a transaction from a UTXO:</p>
</div>
<div class="listingblock data-line-58">
<div class="content">
<pre>> utxo = {
txId: transaction id containing an unspent output,
outputIndex: output indexi 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)</pre>
</div>
</div>
<div class="paragraph data-line-75">
<p>Replace the last transaction in the mempool (replace-by-fee):</p>
</div>
<div class="listingblock data-line-77">
<div class="content">
<pre>> rbfTx = new Transaction()
.from(utxo)
.to(address, 35000)
.fee(fee*2)
.enableRBF()
.sign(privateKeyOfUtxo);
> tx.serialize();
> rbfTx.serialize();</pre>
</div>
</div>
<div class="paragraph data-line-88">
<p>Broadcasting a transaction to the Bitcoin network
(note: broadcast valid transactions only; refer to <a href="https://bitnodes.21.co/nodes" class="undefined" data-href="https://bitnodes.21.co/nodes">https://bitnodes.21.co/nodes</a> for peer hosts):</p>
</div>
<div class="olist arabic data-line-91">
<ol class="arabic">
<li class="data-line-91">
<p>Copy the code below into a file called <em>broadcast.js</em>.</p>
</li>
<li class="data-line-92">
<p>The tx and rbfTx variables are the output of tx.serialize() and rbfTx.serialize(), respectively.</p>
</li>
<li class="data-line-93">
<p>In order to replace-by-fee, the peer must support bitcoind option mempoolreplace and have it set to 1.</p>
</li>
<li class="data-line-94">
<p>Run the file node <em>broadcast.js</em>:</p>
</li>
</ol>
</div>
<div class="listingblock data-line-96">
<div class="content">
<pre>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();</pre>
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