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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 building API that allows you to construct and sign 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@3cda3a8[Running, parallelism = 4, size = 0, active = 0, running = 0, steals = 0, tasks = 0, submissions = 0]</span>
<span class="hljs-comment">// Initialize a transaction builder</span>
<span class="hljs-keyword">val</span> builder = <span class="hljs-type">RawTxBuilder</span>()
<span class="hljs-comment">// builder: RawTxBuilder = RawTxBuilder()</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(ECPrivateKey)</span>
<span class="hljs-keyword">val</span> pubKey = privKey.publicKey
<span class="hljs-comment">// pubKey: ECPublicKey = ECPublicKey(03ec8d695923845bdebb71529030c176ec270e7a9f1ebe8d0eef6bebd5308c441a)</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(8e18575c73655d5de73b89f5b589efb6549e5555)</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(8e18575c73655d5de73b89f5b589efb6549e5555))</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(ECPrivateKey)</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 receiving 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(4231a8a873934933e03fa62e7abaac37c6155215)</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> destination0 = <span class="hljs-type">TransactionOutput</span>(value = destinationAmount,
scriptPubKey = destinationSPK)
<span class="hljs-type">Vector</span>(destination0)
}
<span class="hljs-comment">// destinations: Vector[TransactionOutput] = Vector(TransactionOutput(5000 sats,pkh(4231a8a873934933e03fa62e7abaac37c6155215)))</span>
<span class="hljs-comment">// Add the destinations to the tx builder</span>
builder ++= destinations
<span class="hljs-comment">// res0: RawTxBuilder = RawTxBuilder()</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 = BaseTransaction(Int32Impl(1),Vector(),Vector(TransactionOutput(10000 sats,pkh(8e18575c73655d5de73b89f5b589efb6549e5555))),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(22dcbd81f4e053d3399dea39354fee4725eb0ee122381632826ca86e3df91568:0)</span>
<span class="hljs-keyword">val</span> input = <span class="hljs-type">TransactionInput</span>(
outPoint,
<span class="hljs-type">EmptyScriptSignature</span>,
sequenceNumber = <span class="hljs-type">UInt32</span>.zero)
<span class="hljs-comment">// input: TransactionInput = TransactionInputImpl(TransactionOutPoint(22dcbd81f4e053d3399dea39354fee4725eb0ee122381632826ca86e3df91568:0),EmptyScriptSignature,UInt32Impl(0))</span>
<span class="hljs-comment">// Add a new input to our builder</span>
builder += input
<span class="hljs-comment">// res1: RawTxBuilder = RawTxBuilder()</span>
<span class="hljs-comment">// We can now generate a RawTxBuilderResult ready to be finalized</span>
<span class="hljs-keyword">val</span> builderResult = builder.result()
<span class="hljs-comment">// builderResult: RawTxBuilderResult = RawTxBuilderResult(Int32Impl(2),Vector(TransactionInputImpl(TransactionOutPoint(22dcbd81f4e053d3399dea39354fee4725eb0ee122381632826ca86e3df91568:0),EmptyScriptSignature,UInt32Impl(0))),Vector(TransactionOutput(5000 sats,pkh(4231a8a873934933e03fa62e7abaac37c6155215))),UInt32Impl(0))</span>
<span class="hljs-comment">// this contains the information needed to analyze our input during finalization</span>
<span class="hljs-keyword">val</span> inputInfo = <span class="hljs-type">P2PKHInputInfo</span>(outPoint, amount, privKey.publicKey)
<span class="hljs-comment">// inputInfo: P2PKHInputInfo = P2PKHInputInfo(TransactionOutPoint(22dcbd81f4e053d3399dea39354fee4725eb0ee122381632826ca86e3df91568:0),10000 sats,ECPublicKey(03ec8d695923845bdebb71529030c176ec270e7a9f1ebe8d0eef6bebd5308c441a))</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 = 1 sats/byte</span>
<span class="hljs-keyword">val</span> changePrivKey = <span class="hljs-type">ECPrivateKey</span>.freshPrivateKey
<span class="hljs-comment">// changePrivKey: ECPrivateKey = Masked(ECPrivateKey)</span>
<span class="hljs-keyword">val</span> changeSPK = <span class="hljs-type">P2PKHScriptPubKey</span>(pubKey = changePrivKey.publicKey)
<span class="hljs-comment">// changeSPK: P2PKHScriptPubKey = pkh(49e435c223064fe7c97d02c6e669c525bbe2bc55)</span>
<span class="hljs-comment">// We chose a finalizer that adds a change output to our tx based on a fee rate</span>
<span class="hljs-keyword">val</span> finalizer = <span class="hljs-type">StandardNonInteractiveFinalizer</span>(
<span class="hljs-type">Vector</span>(inputInfo),
feeRate,
changeSPK)
<span class="hljs-comment">// finalizer: StandardNonInteractiveFinalizer = StandardNonInteractiveFinalizer(Vector(P2PKHInputInfo(TransactionOutPoint(22dcbd81f4e053d3399dea39354fee4725eb0ee122381632826ca86e3df91568:0),10000 sats,ECPublicKey(03ec8d695923845bdebb71529030c176ec270e7a9f1ebe8d0eef6bebd5308c441a))),1 sats/byte,pkh(49e435c223064fe7c97d02c6e669c525bbe2bc55))</span>
<span class="hljs-comment">// We can now finalize the tx builder result from earlier with this finalizer</span>
<span class="hljs-keyword">val</span> unsignedTx: <span class="hljs-type">Transaction</span> = finalizer.buildTx(builderResult)
<span class="hljs-comment">// unsignedTx: Transaction = BaseTransaction(Int32Impl(2),Vector(TransactionInputImpl(TransactionOutPoint(22dcbd81f4e053d3399dea39354fee4725eb0ee122381632826ca86e3df91568:0),EmptyScriptSignature,UInt32Impl(0))),Vector(TransactionOutput(5000 sats,pkh(4231a8a873934933e03fa62e7abaac37c6155215)), TransactionOutput(4775 sats,pkh(49e435c223064fe7c97d02c6e669c525bbe2bc55))),UInt32Impl(0))</span>
<span class="hljs-comment">// We now turn to signing the unsigned transaction</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> utxoInfo = <span class="hljs-type">ScriptSignatureParams</span>(inputInfo = inputInfo,
prevTransaction = creditingTx,
signers = <span class="hljs-type">Vector</span>(privKey),
hashType =
<span class="hljs-type">HashType</span>.sigHashAll)
<span class="hljs-comment">// utxoInfo: ScriptSignatureParams[P2PKHInputInfo] = ScriptSignatureParams(P2PKHInputInfo(TransactionOutPoint(22dcbd81f4e053d3399dea39354fee4725eb0ee122381632826ca86e3df91568:0),10000 sats,ECPublicKey(03ec8d695923845bdebb71529030c176ec270e7a9f1ebe8d0eef6bebd5308c441a)),BaseTransaction(Int32Impl(1),Vector(),Vector(TransactionOutput(10000 sats,pkh(8e18575c73655d5de73b89f5b589efb6549e5555))),UInt32Impl(0)),Vector(Masked(ECPrivateKey)),SIGHASH_ALL(1))</span>
<span class="hljs-comment">// all of the UTXO spending information, since we only have</span>
<span class="hljs-comment">// one input, this is just one element</span>
<span class="hljs-keyword">val</span> utxoInfos: <span class="hljs-type">Vector</span>[<span class="hljs-type">ScriptSignatureParams</span>[<span class="hljs-type">InputInfo</span>]] = <span class="hljs-type">Vector</span>(utxoInfo)
<span class="hljs-comment">// utxoInfos: Vector[ScriptSignatureParams[InputInfo]] = Vector(ScriptSignatureParams(P2PKHInputInfo(TransactionOutPoint(22dcbd81f4e053d3399dea39354fee4725eb0ee122381632826ca86e3df91568:0),10000 sats,ECPublicKey(03ec8d695923845bdebb71529030c176ec270e7a9f1ebe8d0eef6bebd5308c441a)),BaseTransaction(Int32Impl(1),Vector(),Vector(TransactionOutput(10000 sats,pkh(8e18575c73655d5de73b89f5b589efb6549e5555))),UInt32Impl(0)),Vector(Masked(ECPrivateKey)),SIGHASH_ALL(1)))</span>
<span class="hljs-comment">// Yay! Now we use the RawTxSigner object to sign the 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 ScriptSignatureParams 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-type">RawTxSigner</span>.sign(
utx = unsignedTx,
utxoInfos = utxoInfos,
expectedFeeRate = feeRate
)
<span class="hljs-comment">// signedTx: Transaction = BaseTransaction(Int32Impl(2),Vector(TransactionInputImpl(TransactionOutPoint(22dcbd81f4e053d3399dea39354fee4725eb0ee122381632826ca86e3df91568:0),P2PKHScriptSignature(ECPublicKeyBytes(ByteVector(33 bytes, 0x03ec8d695923845bdebb71529030c176ec270e7a9f1ebe8d0eef6bebd5308c441a)), ECDigitalSignature(30440220487ea8346c8106ca114e2c376d98d81fcae485b1f1f9c778f56055c7b8cc42a802200e5d06c2d9b6efb408c4c4cb3ffd3757c0f69bf3789abeef3b56684a94f550e701)),UInt32Impl(0))),Vector(TransactionOutput(5000 sats,pkh(4231a8a873934933e03fa62e7abaac37c6155215)), TransactionOutput(4775 sats,pkh(49e435c223064fe7c97d02c6e669c525bbe2bc55))),UInt32Impl(0))</span>
</code></pre>
<pre><code class="hljs css language-scala">signedTx.inputs.length
<span class="hljs-comment">// res2: Int = 1</span>
signedTx.outputs.length
<span class="hljs-comment">// res3: 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">// res4: String = 02000000016815f93d6ea86c8232163822e10eeb2547ee4f3539ea9d39d353e0f481bddc22000000006a4730440220487ea8346c8106ca114e2c376d98d81fcae485b1f1f9c778f56055c7b8cc42a802200e5d06c2d9b6efb408c4c4cb3ffd3757c0f69bf3789abeef3b56684a94f550e7012103ec8d695923845bdebb71529030c176ec270e7a9f1ebe8d0eef6bebd5308c441a000000000288130000000000001976a9144231a8a873934933e03fa62e7abaac37c615521588aca7120000000000001976a91449e435c223064fe7c97d02c6e669c525bbe2bc5588ac00000000</span>
</code></pre>
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