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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>
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<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
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<span class="hljs-comment">// ec: ExecutionContext = scala.concurrent.impl.ExecutionContextImpl$$anon$3@13479620[Running, parallelism = 4, size = 0, active = 0, running = 0, steals = 0, tasks = 0, submissions = 0]</span>
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<span class="hljs-comment">// Initialize a transaction builder</span>
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<span class="hljs-keyword">val</span> builder = <span class="hljs-type">RawTxBuilder</span>()
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<span class="hljs-comment">// builder: RawTxBuilder = RawTxBuilder()</span>
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<span class="hljs-comment">// generate a fresh private key that we are going to use in the scriptpubkey</span>
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<span class="hljs-keyword">val</span> privKey = <span class="hljs-type">ECPrivateKey</span>.freshPrivateKey
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<span class="hljs-comment">// privKey: ECPrivateKey = Masked(ECPrivateKey)</span>
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<span class="hljs-keyword">val</span> pubKey = privKey.publicKey
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<span class="hljs-comment">// pubKey: ECPublicKey = ECPublicKey(030b962e9fed35ca722ecc777f8869aa1bc1d8fa1e432f60ce442d24002946b228)</span>
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<span class="hljs-comment">// this is the script that the TxBuilder is going to create a</span>
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<span class="hljs-comment">// script signature that validly spends this scriptPubKey</span>
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<span class="hljs-keyword">val</span> creditingSpk = <span class="hljs-type">P2PKHScriptPubKey</span>(pubKey = privKey.publicKey)
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<span class="hljs-comment">// creditingSpk: P2PKHScriptPubKey = pkh(653c1353ca84b02d2c7f84a703b9e1dc5bbd0a07)</span>
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<span class="hljs-keyword">val</span> amount = <span class="hljs-number">10000.</span>satoshis
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<span class="hljs-comment">// amount: Satoshis = 10000 sats</span>
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<span class="hljs-comment">// this is the UTXO we are going to be spending</span>
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<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">// utxo: TransactionOutput = TransactionOutput(10000 sats,pkh(653c1353ca84b02d2c7f84a703b9e1dc5bbd0a07))</span>
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<span class="hljs-comment">// the private key that locks the funds for the script we are spending too</span>
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<span class="hljs-keyword">val</span> destinationPrivKey = <span class="hljs-type">ECPrivateKey</span>.freshPrivateKey
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<span class="hljs-comment">// destinationPrivKey: ECPrivateKey = Masked(ECPrivateKey)</span>
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<span class="hljs-comment">// the amount we are sending -- 5000 satoshis -- to the destinationSPK</span>
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<span class="hljs-keyword">val</span> destinationAmount = <span class="hljs-number">5000.</span>satoshis
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<span class="hljs-comment">// destinationAmount: Satoshis = 5000 sats</span>
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<span class="hljs-comment">// the script that corresponds to destination private key, this is what is receiving the money</span>
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<span class="hljs-keyword">val</span> destinationSPK =
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<span class="hljs-type">P2PKHScriptPubKey</span>(pubKey = destinationPrivKey.publicKey)
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<span class="hljs-comment">// destinationSPK: P2PKHScriptPubKey = pkh(628a337d5267e617b5dc15372ca7b0d11547ecf4)</span>
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<span class="hljs-comment">// this is where we are sending money too</span>
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<span class="hljs-comment">// we could add more destinations here if we</span>
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<span class="hljs-comment">// wanted to batch transactions</span>
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<span class="hljs-keyword">val</span> destinations = {
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<span class="hljs-keyword">val</span> destination0 = <span class="hljs-type">TransactionOutput</span>(value = destinationAmount,
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scriptPubKey = destinationSPK)
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<span class="hljs-type">Vector</span>(destination0)
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}
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<span class="hljs-comment">// destinations: Vector[TransactionOutput] = Vector(TransactionOutput(5000 sats,pkh(628a337d5267e617b5dc15372ca7b0d11547ecf4)))</span>
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<span class="hljs-comment">// Add the destinations to the tx builder</span>
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builder ++= destinations
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<span class="hljs-comment">// res0: RawTxBuilder = RawTxBuilder()</span>
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<span class="hljs-comment">// we have to fabricate a transaction that contains the</span>
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<span class="hljs-comment">// UTXO we are trying to spend. If this were a real blockchain</span>
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<span class="hljs-comment">// we would need to reference the UTXO set</span>
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<span class="hljs-keyword">val</span> creditingTx = <span class="hljs-type">BaseTransaction</span>(version = <span class="hljs-type">Int32</span>.one,
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inputs = <span class="hljs-type">Vector</span>.empty,
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outputs = <span class="hljs-type">Vector</span>(utxo),
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lockTime = <span class="hljs-type">UInt32</span>.zero)
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<span class="hljs-comment">// creditingTx: BaseTransaction = BaseTransaction(Int32Impl(1),Vector(),Vector(TransactionOutput(10000 sats,pkh(653c1353ca84b02d2c7f84a703b9e1dc5bbd0a07))),UInt32Impl(0))</span>
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<span class="hljs-comment">// this is the information we need from the crediting TX</span>
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<span class="hljs-comment">// to properly "link" it in the transaction we are creating</span>
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<span class="hljs-keyword">val</span> outPoint = <span class="hljs-type">TransactionOutPoint</span>(creditingTx.txId, <span class="hljs-type">UInt32</span>.zero)
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<span class="hljs-comment">// outPoint: TransactionOutPoint = TransactionOutPoint(f85a8571ee3014c1b6e319c8ccd07bcfd6dfa61259675271c0642d3ede677fa8:0)</span>
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<span class="hljs-keyword">val</span> input = <span class="hljs-type">TransactionInput</span>(
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outPoint,
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<span class="hljs-type">EmptyScriptSignature</span>,
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sequenceNumber = <span class="hljs-type">UInt32</span>.zero)
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<span class="hljs-comment">// input: TransactionInput = TransactionInputImpl(TransactionOutPoint(f85a8571ee3014c1b6e319c8ccd07bcfd6dfa61259675271c0642d3ede677fa8:0),EmptyScriptSignature,UInt32Impl(0))</span>
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<span class="hljs-comment">// Add a new input to our builder</span>
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builder += input
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<span class="hljs-comment">// res1: RawTxBuilder = RawTxBuilder()</span>
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<span class="hljs-comment">// We can now generate a RawTxBuilderResult ready to be finalized</span>
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<span class="hljs-keyword">val</span> builderResult = builder.result()
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<span class="hljs-comment">// builderResult: RawTxBuilderResult = RawTxBuilderResult(Int32Impl(2),Vector(TransactionInputImpl(TransactionOutPoint(f85a8571ee3014c1b6e319c8ccd07bcfd6dfa61259675271c0642d3ede677fa8:0),EmptyScriptSignature,UInt32Impl(0))),Vector(TransactionOutput(5000 sats,pkh(628a337d5267e617b5dc15372ca7b0d11547ecf4))),UInt32Impl(0))</span>
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<span class="hljs-comment">// this contains the information needed to analyze our input during finalization</span>
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<span class="hljs-keyword">val</span> inputInfo = <span class="hljs-type">P2PKHInputInfo</span>(outPoint, amount, privKey.publicKey)
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<span class="hljs-comment">// inputInfo: P2PKHInputInfo = P2PKHInputInfo(TransactionOutPoint(f85a8571ee3014c1b6e319c8ccd07bcfd6dfa61259675271c0642d3ede677fa8:0),10000 sats,ECPublicKey(030b962e9fed35ca722ecc777f8869aa1bc1d8fa1e432f60ce442d24002946b228))</span>
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<span class="hljs-comment">// this is how much we are going to pay as a fee to the network</span>
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<span class="hljs-comment">// for this example, we are going to pay 1 satoshi per byte</span>
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<span class="hljs-keyword">val</span> feeRate = <span class="hljs-type">SatoshisPerByte</span>(<span class="hljs-number">1.</span>satoshi)
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<span class="hljs-comment">// feeRate: SatoshisPerByte = 1 sats/byte</span>
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<span class="hljs-keyword">val</span> changePrivKey = <span class="hljs-type">ECPrivateKey</span>.freshPrivateKey
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<span class="hljs-comment">// changePrivKey: ECPrivateKey = Masked(ECPrivateKey)</span>
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<span class="hljs-keyword">val</span> changeSPK = <span class="hljs-type">P2PKHScriptPubKey</span>(pubKey = changePrivKey.publicKey)
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<span class="hljs-comment">// changeSPK: P2PKHScriptPubKey = pkh(1daa673333832cd71d777c24a8de84e289983657)</span>
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<span class="hljs-comment">// We chose a finalizer that adds a change output to our tx based on a fee rate</span>
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<span class="hljs-keyword">val</span> finalizer = <span class="hljs-type">StandardNonInteractiveFinalizer</span>(
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<span class="hljs-type">Vector</span>(inputInfo),
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feeRate,
|
||
changeSPK)
|
||
<span class="hljs-comment">// finalizer: StandardNonInteractiveFinalizer = StandardNonInteractiveFinalizer(Vector(P2PKHInputInfo(TransactionOutPoint(f85a8571ee3014c1b6e319c8ccd07bcfd6dfa61259675271c0642d3ede677fa8:0),10000 sats,ECPublicKey(030b962e9fed35ca722ecc777f8869aa1bc1d8fa1e432f60ce442d24002946b228))),1 sats/byte,pkh(1daa673333832cd71d777c24a8de84e289983657))</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(f85a8571ee3014c1b6e319c8ccd07bcfd6dfa61259675271c0642d3ede677fa8:0),EmptyScriptSignature,UInt32Impl(0))),Vector(TransactionOutput(5000 sats,pkh(628a337d5267e617b5dc15372ca7b0d11547ecf4)), TransactionOutput(4775 sats,pkh(1daa673333832cd71d777c24a8de84e289983657))),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(f85a8571ee3014c1b6e319c8ccd07bcfd6dfa61259675271c0642d3ede677fa8:0),10000 sats,ECPublicKey(030b962e9fed35ca722ecc777f8869aa1bc1d8fa1e432f60ce442d24002946b228)),BaseTransaction(Int32Impl(1),Vector(),Vector(TransactionOutput(10000 sats,pkh(653c1353ca84b02d2c7f84a703b9e1dc5bbd0a07))),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(f85a8571ee3014c1b6e319c8ccd07bcfd6dfa61259675271c0642d3ede677fa8:0),10000 sats,ECPublicKey(030b962e9fed35ca722ecc777f8869aa1bc1d8fa1e432f60ce442d24002946b228)),BaseTransaction(Int32Impl(1),Vector(),Vector(TransactionOutput(10000 sats,pkh(653c1353ca84b02d2c7f84a703b9e1dc5bbd0a07))),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(f85a8571ee3014c1b6e319c8ccd07bcfd6dfa61259675271c0642d3ede677fa8:0),P2PKHScriptSignature(ECPublicKeyBytes(ByteVector(33 bytes, 0x030b962e9fed35ca722ecc777f8869aa1bc1d8fa1e432f60ce442d24002946b228)), ECDigitalSignature(30440220493f1e9f0f9af5f8bc767d49c018afd63520885e2d6c2b92ff2d2f3b9f246d1902207a0c255108a78ec2187f487f1dca91ff7e630f532a5645835b74079a31280b7401)),UInt32Impl(0))),Vector(TransactionOutput(5000 sats,pkh(628a337d5267e617b5dc15372ca7b0d11547ecf4)), TransactionOutput(4775 sats,pkh(1daa673333832cd71d777c24a8de84e289983657))),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 = 0200000001a87f67de3e2d64c07152675912a6dfd6cf7bd0ccc819e3b6c11430ee71855af8000000006a4730440220493f1e9f0f9af5f8bc767d49c018afd63520885e2d6c2b92ff2d2f3b9f246d1902207a0c255108a78ec2187f487f1dca91ff7e630f532a5645835b74079a31280b740121030b962e9fed35ca722ecc777f8869aa1bc1d8fa1e432f60ce442d24002946b228000000000288130000000000001976a914628a337d5267e617b5dc15372ca7b0d11547ecf488aca7120000000000001976a9141daa673333832cd71d777c24a8de84e28998365788ac00000000</span>
|
||
</code></pre>
|
||
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