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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
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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
< 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 >
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< 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
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< span class = "hljs-comment" > // privKey: ECPrivateKey = Masked(ECPrivateKeyImpl)< / 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(0383604b72577aebd92ab56ba6141a3e942fb86941e37b2e978b11257f8b9a6400)< / span >
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< 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)
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< span class = "hljs-comment" > // creditingSpk: P2PKHScriptPubKey = pkh(be30549d4ac6b3391370321ffbc630aef84272e6)< / 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 >
< 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(be30549d4ac6b3391370321ffbc630aef84272e6))< / span >
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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
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< span class = "hljs-comment" > // destinationPrivKey: ECPrivateKey = Masked(ECPrivateKeyImpl)< / span >
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< 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
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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 protecting the money< / span >
< span class = "hljs-keyword" > val< / span > destinationSPK =
< span class = "hljs-type" > P2PKHScriptPubKey< / span > (pubKey = destinationPrivKey.publicKey)
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< span class = "hljs-comment" > // destinationSPK: P2PKHScriptPubKey = pkh(fab4c315dedacdf530c6b560c146514749533e83)< / span >
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< 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)
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< span class = "hljs-type" > Vector< / span > (destination1)
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}
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< span class = "hljs-comment" > // destinations: Vector[TransactionOutput] = Vector(TransactionOutput(5000 sats,pkh(fab4c315dedacdf530c6b560c146514749533e83)))< / span >
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< 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,
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inputs = < span class = "hljs-type" > Vector< / span > .empty,
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 = BaseTransactionImpl(Int32Impl(1),Vector(),Vector(TransactionOutput(10000 sats,pkh(be30549d4ac6b3391370321ffbc630aef84272e6))),UInt32Impl(0))< / span >
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< 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)
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< span class = "hljs-comment" > // outPoint: TransactionOutPoint = TransactionOutPoint(0f9997fb129243db98adaf0fb4882c14cfbda0a076b954b4bd0a7f500a41eeff:0)< / span >
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< span class = "hljs-comment" > // this contains all the information we need to< / span >
< span class = "hljs-comment" > // validly sign the UTXO above< / span >
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< 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 >
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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 >
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< 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 >
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< 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)
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< span class = "hljs-comment" > // feeRate: SatoshisPerByte = SatoshisPerByte(1 sat)< / 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(ECPrivateKeyImpl)< / 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(79c2ad65b2805f0b56ee83b160a0fc6e9eeec5ff)< / span >
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< 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 >
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< span class = "hljs-comment" > // networkParams: RegTest.type = RegTest< / span >
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< 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)
}
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< 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 >
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< 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)
}
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< 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 >
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< / 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 = 0200000001ffee410a507f0abdb454b976a0a0bdcf142c88b40fafad98db439212fb97990f000000006b483045022100f8138b17824e063daa266388d28117e122bcaca623b5cd5410959b96692d7e5f02201110005441e352ea076ec27c21524ad51ac1b7315209e9760ae07aaf726978ac01210383604b72577aebd92ab56ba6141a3e942fb86941e37b2e978b11257f8b9a6400000000000288130000000000001976a914fab4c315dedacdf530c6b560c146514749533e8388aca6120000000000001976a91479c2ad65b2805f0b56ee83b160a0fc6e9eeec5ff88ac00000000< / span >
2019-06-03 09:35:15 +00:00
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2020-04-27 18:51:06 +00:00
< / span > < / div > < / article > < / div > < div class = "docLastUpdate" > < em > Last updated on 2020-3-23 by Chris Stewart< / em > < / div > < div class = "docs-prevnext" > < a class = "docs-prev button" href = "/docs/core/psbts" > < span class = "arrow-prev" > ← < / span > < span > Partially Signed Bitcoin Transactions< / span > < / a > < a class = "docs-next button" href = "/docs/key-manager/key-manager" > < span > Key Manager< / 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 © 2020 Suredbits & the bitcoin-s developers< / section > < / footer > < / div > < script type = "text/javascript" src = "https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js" > < / script > < script >
2019-06-20 14:53:06 +00:00
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