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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 builder that constructs and signs Bitcoin
transactions. Here's an example of how to use it</p>
<pre><code class="hljs css language-scala"><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">// ec: ExecutionContext = scala.concurrent.impl.ExecutionContextImpl$$anon$3@259cf018[Running, parallelism = 8, size = 2, active = 0, running = 0, steals = 20, tasks = 0, submissions = 0]</span>
<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-comment">// privKey: ECPrivateKey = Masked(ECPrivateKeyImpl)</span>
<span class="hljs-keyword">val</span> pubKey = privKey.publicKey
<span class="hljs-comment">// pubKey: ECPublicKey = ECPublicKey(0383604b72577aebd92ab56ba6141a3e942fb86941e37b2e978b11257f8b9a6400)</span>
<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-comment">// creditingSpk: P2PKHScriptPubKey = pkh(be30549d4ac6b3391370321ffbc630aef84272e6)</span>
<span class="hljs-keyword">val</span> amount = <span class="hljs-number">10000.</span>satoshis
<span class="hljs-comment">// amount: Satoshis = 10000 sats</span>
<span class="hljs-comment">// this is the UTXO we are going to be spending</span>
<span class="hljs-keyword">val</span> utxo =
<span class="hljs-type">TransactionOutput</span>(value = amount, scriptPubKey = creditingSpk)
<span class="hljs-comment">// utxo: TransactionOutput = TransactionOutput(10000 sats,pkh(be30549d4ac6b3391370321ffbc630aef84272e6))</span>
<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">// destinationPrivKey: ECPrivateKey = Masked(ECPrivateKeyImpl)</span>
<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">// destinationAmount: Satoshis = 5000 sats</span>
<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">// destinationSPK: P2PKHScriptPubKey = pkh(fab4c315dedacdf530c6b560c146514749533e83)</span>
<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 = {
<span class="hljs-keyword">val</span> destination1 = <span class="hljs-type">TransactionOutput</span>(value = destinationAmount,
scriptPubKey = destinationSPK)
<span class="hljs-type">Vector</span>(destination1)
}
<span class="hljs-comment">// destinations: Vector[TransactionOutput] = Vector(TransactionOutput(5000 sats,pkh(fab4c315dedacdf530c6b560c146514749533e83)))</span>
<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">Vector</span>.empty,
outputs = <span class="hljs-type">Vector</span>(utxo),
lockTime = <span class="hljs-type">UInt32</span>.zero)
<span class="hljs-comment">// creditingTx: BaseTransaction = BaseTransactionImpl(Int32Impl(1),Vector(),Vector(TransactionOutput(10000 sats,pkh(be30549d4ac6b3391370321ffbc630aef84272e6))),UInt32Impl(0))</span>
<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">// outPoint: TransactionOutPoint = TransactionOutPoint(0f9997fb129243db98adaf0fb4882c14cfbda0a076b954b4bd0a7f500a41eeff:0)</span>
<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">BitcoinUTXOSpendingInfoFull</span>(outPoint = outPoint,
output = utxo,
signers = <span class="hljs-type">Vector</span>(privKey),
redeemScriptOpt = <span class="hljs-type">None</span>,
scriptWitnessOpt = <span class="hljs-type">None</span>,
hashType =
<span class="hljs-type">HashType</span>.sigHashAll,
conditionalPath =
<span class="hljs-type">ConditionalPath</span>.<span class="hljs-type">NoConditionsLeft</span>)
<span class="hljs-comment">// utxoSpendingInfo: BitcoinUTXOSpendingInfoFull = P2PKHSpendingInfo(TransactionOutPoint(0f9997fb129243db98adaf0fb4882c14cfbda0a076b954b4bd0a7f500a41eeff:0),10000 sats,pkh(be30549d4ac6b3391370321ffbc630aef84272e6),Masked(ECPrivateKeyImpl),SIGHASH_ALL(Int32Impl(1)))</span>
<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">Vector</span>[<span class="hljs-type">BitcoinUTXOSpendingInfoFull</span>] = <span class="hljs-type">Vector</span>(utxoSpendingInfo)
<span class="hljs-comment">// utxos: Vector[BitcoinUTXOSpendingInfoFull] = Vector(P2PKHSpendingInfo(TransactionOutPoint(0f9997fb129243db98adaf0fb4882c14cfbda0a076b954b4bd0a7f500a41eeff:0),10000 sats,pkh(be30549d4ac6b3391370321ffbc630aef84272e6),Masked(ECPrivateKeyImpl),SIGHASH_ALL(Int32Impl(1))))</span>
<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-comment">// feeRate: SatoshisPerByte = SatoshisPerByte(1 sat)</span>
<span class="hljs-keyword">val</span> changePrivKey = <span class="hljs-type">ECPrivateKey</span>.freshPrivateKey
<span class="hljs-comment">// changePrivKey: ECPrivateKey = Masked(ECPrivateKeyImpl)</span>
<span class="hljs-keyword">val</span> changeSPK = <span class="hljs-type">P2PKHScriptPubKey</span>(pubKey = changePrivKey.publicKey)
<span class="hljs-comment">// changeSPK: P2PKHScriptPubKey = pkh(79c2ad65b2805f0b56ee83b160a0fc6e9eeec5ff)</span>
<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">// networkParams: RegTest.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">// txBuilder: BitcoinTxBuilder = BitcoinTxBuilderImpl(Vector(TransactionOutput(5000 sats,pkh(fab4c315dedacdf530c6b560c146514749533e83))),Map(TransactionOutPoint(0f9997fb129243db98adaf0fb4882c14cfbda0a076b954b4bd0a7f500a41eeff:0) -> P2PKHSpendingInfo(TransactionOutPoint(0f9997fb129243db98adaf0fb4882c14cfbda0a076b954b4bd0a7f500a41eeff:0),10000 sats,pkh(be30549d4ac6b3391370321ffbc630aef84272e6),Masked(ECPrivateKeyImpl),SIGHASH_ALL(Int32Impl(1)))),SatoshisPerByte(1 sat),pkh(79c2ad65b2805f0b56ee83b160a0fc6e9eeec5ff),RegTest)</span>
<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)
}
<span class="hljs-comment">// signedTx: Transaction = BaseTransactionImpl(Int32Impl(2),List(TransactionInputImpl(TransactionOutPoint(0f9997fb129243db98adaf0fb4882c14cfbda0a076b954b4bd0a7f500a41eeff:0),P2PKHScriptSignature(ECPublicKey(0383604b72577aebd92ab56ba6141a3e942fb86941e37b2e978b11257f8b9a6400), ECDigitalSignature(3045022100f8138b17824e063daa266388d28117e122bcaca623b5cd5410959b96692d7e5f02201110005441e352ea076ec27c21524ad51ac1b7315209e9760ae07aaf726978ac01)),UInt32Impl(0))),Vector(TransactionOutput(5000 sats,pkh(fab4c315dedacdf530c6b560c146514749533e83)), TransactionOutput(4774 sats,pkh(79c2ad65b2805f0b56ee83b160a0fc6e9eeec5ff))),UInt32Impl(0))</span>
</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
<span class="hljs-comment">// res2: String = 0200000001ffee410a507f0abdb454b976a0a0bdcf142c88b40fafad98db439212fb97990f000000006b483045022100f8138b17824e063daa266388d28117e122bcaca623b5cd5410959b96692d7e5f02201110005441e352ea076ec27c21524ad51ac1b7315209e9760ae07aaf726978ac01210383604b72577aebd92ab56ba6141a3e942fb86941e37b2e978b11257f8b9a6400000000000288130000000000001976a914fab4c315dedacdf530c6b560c146514749533e8388aca6120000000000001976a91479c2ad65b2805f0b56ee83b160a0fc6e9eeec5ff88ac00000000</span>
</code></pre>
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