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</script></nav></div><div class="container mainContainer docsContainer"><div class="wrapper"><div class="post"><header class="postHeader"><a class="edit-page-link button" href="https://github.com/bitcoin-s/bitcoin-s/blob/master/docs/core/txbuilder.md" target="_blank" rel="noreferrer noopener">Edit</a><h1 id="__docusaurus" class="postHeaderTitle">TxBuilder example</h1></header><article><div><span><p>Bitcoin-S features a transaction buidlder that constructs and signs Bitcoin
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transactions. Here's an example of how to use it</p>
<pre><code class="hljs css language-scala"><span class="hljs-keyword">import</span> scala.concurrent._
<span class="hljs-keyword">import</span> scala.concurrent.duration._
<span class="hljs-keyword">import</span> org.bitcoins.core._
<span class="hljs-keyword">import</span> number._
<span class="hljs-keyword">import</span> config._
<span class="hljs-keyword">import</span> currency._
<span class="hljs-keyword">import</span> crypto._
<span class="hljs-keyword">import</span> script.crypto._
<span class="hljs-keyword">import</span> protocol.transaction._
<span class="hljs-keyword">import</span> protocol.script._
<span class="hljs-keyword">import</span> wallet.builder._
<span class="hljs-keyword">import</span> wallet.fee._
<span class="hljs-keyword">import</span> wallet.utxo._
<span class="hljs-keyword">implicit</span> <span class="hljs-keyword">val</span> ec: <span class="hljs-type">ExecutionContext</span> = <span class="hljs-type">ExecutionContext</span>.<span class="hljs-type">Implicits</span>.global
<span class="hljs-comment">// generate a fresh private key that we are going to use in the scriptpubkey</span>
<span class="hljs-keyword">val</span> privKey = <span class="hljs-type">ECPrivateKey</span>.freshPrivateKey
<span class="hljs-keyword">val</span> pubKey = privKey.publicKey
<span class="hljs-comment">// this is the script that the TxBuilder is going to create a</span>
<span class="hljs-comment">// script signature that validly spends this scriptPubKey</span>
<span class="hljs-keyword">val</span> creditingSpk = <span class="hljs-type">P2PKHScriptPubKey</span>(pubKey = privKey.publicKey)
<span class="hljs-keyword">val</span> amount = <span class="hljs-number">10000.</span>satoshis
<span class="hljs-comment">// this is the UTXO we are going to be spending</span>
<span class="hljs-keyword">val</span> utxo =
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<span class="hljs-type">TransactionOutput</span>(value = amount, scriptPubKey = creditingSpk)
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<span class="hljs-comment">// the private key that locks the funds for the script we are spending too</span>
<span class="hljs-keyword">val</span> destinationPrivKey = <span class="hljs-type">ECPrivateKey</span>.freshPrivateKey
<span class="hljs-comment">// the amount we are sending -- 5000 satoshis -- to the destinationSPK</span>
<span class="hljs-keyword">val</span> destinationAmount = <span class="hljs-number">5000.</span>satoshis
<span class="hljs-comment">// the script that corresponds to destination private key, this is what is protecting the money</span>
<span class="hljs-keyword">val</span> destinationSPK =
<span class="hljs-type">P2PKHScriptPubKey</span>(pubKey = destinationPrivKey.publicKey)
<span class="hljs-comment">// this is where we are sending money too</span>
<span class="hljs-comment">// we could add more destinations here if we</span>
<span class="hljs-comment">// wanted to batch transactions</span>
<span class="hljs-keyword">val</span> destinations = {
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<span class="hljs-keyword">val</span> destination1 = <span class="hljs-type">TransactionOutput</span>(value = destinationAmount,
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scriptPubKey = destinationSPK)
<span class="hljs-type">List</span>(destination1)
}
<span class="hljs-comment">// we have to fabricate a transaction that contains the</span>
<span class="hljs-comment">// UTXO we are trying to spend. If this were a real blockchain</span>
<span class="hljs-comment">// we would need to reference the UTXO set</span>
<span class="hljs-keyword">val</span> creditingTx = <span class="hljs-type">BaseTransaction</span>(version = <span class="hljs-type">Int32</span>.one,
inputs = <span class="hljs-type">List</span>.empty,
outputs = <span class="hljs-type">List</span>(utxo),
lockTime = <span class="hljs-type">UInt32</span>.zero)
<span class="hljs-comment">// this is the information we need from the crediting TX</span>
<span class="hljs-comment">// to properly "link" it in the transaction we are creating</span>
<span class="hljs-keyword">val</span> outPoint = <span class="hljs-type">TransactionOutPoint</span>(creditingTx.txId, <span class="hljs-type">UInt32</span>.zero)
<span class="hljs-comment">// this contains all the information we need to</span>
<span class="hljs-comment">// validly sign the UTXO above</span>
<span class="hljs-keyword">val</span> utxoSpendingInfo = <span class="hljs-type">BitcoinUTXOSpendingInfo</span>(outPoint = outPoint,
output = utxo,
signers = <span class="hljs-type">List</span>(privKey),
redeemScriptOpt = <span class="hljs-type">None</span>,
scriptWitnessOpt = <span class="hljs-type">None</span>,
hashType =
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<span class="hljs-type">HashType</span>.sigHashAll,
conditionalPath =
<span class="hljs-type">ConditionalPath</span>.<span class="hljs-type">NoConditionsLeft</span>)
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<span class="hljs-comment">// all of the UTXO spending information, since we are only</span>
<span class="hljs-comment">//spending one UTXO, this is just one element</span>
<span class="hljs-keyword">val</span> utxos: <span class="hljs-type">List</span>[<span class="hljs-type">BitcoinUTXOSpendingInfo</span>] = <span class="hljs-type">List</span>(utxoSpendingInfo)
<span class="hljs-comment">// this is how much we are going to pay as a fee to the network</span>
<span class="hljs-comment">// for this example, we are going to pay 1 satoshi per byte</span>
<span class="hljs-keyword">val</span> feeRate = <span class="hljs-type">SatoshisPerByte</span>(<span class="hljs-number">1.</span>satoshi)
<span class="hljs-keyword">val</span> changePrivKey = <span class="hljs-type">ECPrivateKey</span>.freshPrivateKey
<span class="hljs-keyword">val</span> changeSPK = <span class="hljs-type">P2PKHScriptPubKey</span>(pubKey = changePrivKey.publicKey)
<span class="hljs-comment">// the network we are on, for this example we are using</span>
<span class="hljs-comment">// the regression test network. This is a network you control</span>
<span class="hljs-comment">// on your own machine</span>
<span class="hljs-keyword">val</span> networkParams = <span class="hljs-type">RegTest</span>
<span class="hljs-comment">// Yay! Now we have a TxBuilder object that we can use</span>
<span class="hljs-comment">// to sign the TX.</span>
<span class="hljs-keyword">val</span> txBuilder: <span class="hljs-type">BitcoinTxBuilder</span> = {
<span class="hljs-keyword">val</span> builderF = <span class="hljs-type">BitcoinTxBuilder</span>(
destinations = destinations,
utxos = utxos,
feeRate = feeRate,
changeSPK = changeSPK,
network = networkParams)
<span class="hljs-type">Await</span>.result(builderF, <span class="hljs-number">30.</span>seconds)
}
<span class="hljs-comment">// Let's finally produce a validly signed tx!</span>
<span class="hljs-comment">// The 'sign' method is going produce a validly signed transaction</span>
<span class="hljs-comment">// This is going to iterate through each of the UTXOs and use</span>
<span class="hljs-comment">// the corresponding UTXOSpendingInfo to produce a validly</span>
<span class="hljs-comment">// signed input. This UTXO has:</span>
<span class="hljs-comment">// 1: one input</span>
<span class="hljs-comment">// 2: outputs (destination and change outputs)</span>
<span class="hljs-comment">// 3: a fee rate of 1 satoshi/byte</span>
<span class="hljs-keyword">val</span> signedTx: <span class="hljs-type">Transaction</span> = {
<span class="hljs-keyword">val</span> signF = txBuilder.sign
<span class="hljs-type">Await</span>.result(signF, <span class="hljs-number">30.</span>seconds)
}
</code></pre>
<pre><code class="hljs css language-scala">signedTx.inputs.length
<span class="hljs-comment">// res0: Int = 1</span>
signedTx.outputs.length
<span class="hljs-comment">// res1: Int = 2</span>
<span class="hljs-comment">//remember, you can call .hex on any bitcoin-s data structure to get the hex representation!</span>
signedTx.hex
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<span class="hljs-comment">// res2: String = "0200000001aaa194af011ead436c86eddd507b9a02fc7b15b190d6975fa68757f5cf6ef640000000006a473044022070862947a8ee417f0873e9edb9484684c3671b109e1f69403135220bf4c9687c02207d2395edb2a88522d42fb3e34c6e86f8b81b333b18759dfb6a78ed978d30a07c01210342b79cc77b59e28a5f569348e9efd5fa9a37982f18c1d29b0818bc8890a1c60b000000000288130000000000001976a9146c9e69cc34268e73bbf02c0819d92db359385cd188aca6120000000000001976a914e5050227c7823cb7c5da0f8d879b1562b4ca581c88ac00000000"</span>
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</code></pre>
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</span></div></article></div><div class="docLastUpdate"><em>Last updated on 2019-11-6 by Nadav Kohen</em></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/core/hd-keys"><span class="arrow-prev">← </span><span>HD key generation</span></a><a class="docs-next button" href="/docs/rpc/rpc-clients-intro"><span>Introduction</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"></nav></div><footer class="nav-footer" id="footer"><section class="sitemap"><a href="/" class="nav-home"><img src="/img/favicon.ico" alt="bitcoin-s" width="66" height="58"/></a><div><h5>Docs</h5><a href="/docs/en/getting-started">Getting Started</a><a href="/docs/en/core/core-intro">Guides</a><a href="/api/org/bitcoins">API Reference</a></div><div><h5>Community</h5><a href="/en/users.html">User Showcase</a><a href="https://join.slack.com/t/suredbits/shared_invite/enQtNDEyMjY3MTg1MTg3LTYyYjkwOGUzMDQ4NDAwZjE1M2I3MmQyNWNlZjNlYjg4OGRjYTRjNWUwNjRjNjg4Y2NjZjAxYjU1N2JjMTU1YWM" target="_blank" rel="noreferrer noopener">Slack</a><a href="https://gitter.im/bitcoin-s-core/">Gitter chat</a></div><div><h5>More</h5><a href="https://github.com/bitcoin-s/bitcoin-s">GitHub</a><a class="github-button" href="https://github.com/bitcoin-s/bitcoin-s" data-icon="octicon-star" data-count-href="/bitcoin-s/bitcoin-s-core/stargazers" data-show-count="true" data-count-aria-label="# stargazers on GitHub" aria-label="Star this project on GitHub">Star</a></div></section><section class="copyright">Copyright © 2019 Suredbits &amp; the bitcoin-s developers</section></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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