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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@5467af1c[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 >
< span class = "hljs-keyword" > val< / span > builder = < span class = "hljs-type" > RawTxBuilder< / span > ()
< 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 >
< 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(022e844ef714c5e8b9d8ee19b527aede3763585009d4db38c5b01fc82bfea010ed)< / 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(eeba2cbd2eb4d4cac2aef40a50ce65057278ca21)< / 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(eeba2cbd2eb4d4cac2aef40a50ce65057278ca21))< / 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(ECPrivateKey)< / 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 receiving the money< / span >
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< 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(47292e3b8acd9c36d7520602474dea519d11f4c6)< / 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 > 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(47292e3b8acd9c36d7520602474dea519d11f4c6)))< / span >
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< span class = "hljs-comment" > // Add the destinations to the tx builder< / span >
builder ++= destinations
< 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 >
< 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 = BaseTransaction(Int32Impl(1),Vector(),Vector(TransactionOutput(10000 sats,pkh(eeba2cbd2eb4d4cac2aef40a50ce65057278ca21))),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(ba5a46fec3f4fb0e6517ed6fa5322824dbd592f2c2bd61ae987c0698f877dbf5:0)< / span >
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< 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)
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< span class = "hljs-comment" > // input: TransactionInput = TransactionInputImpl(TransactionOutPoint(ba5a46fec3f4fb0e6517ed6fa5322824dbd592f2c2bd61ae987c0698f877dbf5:0),EmptyScriptSignature,UInt32Impl(0))< / span >
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< span class = "hljs-comment" > // Add a new input to our builder< / span >
builder += input
< 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 >
< 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(ba5a46fec3f4fb0e6517ed6fa5322824dbd592f2c2bd61ae987c0698f877dbf5:0),EmptyScriptSignature,UInt32Impl(0))),Vector(TransactionOutput(5000 sats,pkh(47292e3b8acd9c36d7520602474dea519d11f4c6))),UInt32Impl(0))< / span >
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< 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)
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< span class = "hljs-comment" > // inputInfo: P2PKHInputInfo = P2PKHInputInfo(TransactionOutPoint(ba5a46fec3f4fb0e6517ed6fa5322824dbd592f2c2bd61ae987c0698f877dbf5:0),10000 sats,ECPublicKey(022e844ef714c5e8b9d8ee19b527aede3763585009d4db38c5b01fc82bfea010ed))< / 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 = 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(c0439dfe4e5867d820746dcea5bd19d1479f3ef7)< / 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),
feeRate,
changeSPK)
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< span class = "hljs-comment" > // finalizer: StandardNonInteractiveFinalizer = StandardNonInteractiveFinalizer(Vector(P2PKHInputInfo(TransactionOutPoint(ba5a46fec3f4fb0e6517ed6fa5322824dbd592f2c2bd61ae987c0698f877dbf5:0),10000 sats,ECPublicKey(022e844ef714c5e8b9d8ee19b527aede3763585009d4db38c5b01fc82bfea010ed))),1 sats/byte,pkh(c0439dfe4e5867d820746dcea5bd19d1479f3ef7))< / span >
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< span class = "hljs-comment" > // We can now finalize the tx builder result from earlier with this finalizer< / span >
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< span class = "hljs-keyword" > val< / span > unsignedTx: < span class = "hljs-type" > Transaction< / span > = finalizer.buildTx(builderResult)
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< span class = "hljs-comment" > // unsignedTx: Transaction = BaseTransaction(Int32Impl(2),Vector(TransactionInputImpl(TransactionOutPoint(ba5a46fec3f4fb0e6517ed6fa5322824dbd592f2c2bd61ae987c0698f877dbf5:0),EmptyScriptSignature,UInt32Impl(0))),Vector(TransactionOutput(5000 sats,pkh(47292e3b8acd9c36d7520602474dea519d11f4c6)), TransactionOutput(4775 sats,pkh(c0439dfe4e5867d820746dcea5bd19d1479f3ef7))),UInt32Impl(0))< / span >
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< 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,
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prevTransaction = creditingTx,
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signers = < span class = "hljs-type" > Vector< / span > (privKey),
hashType =
< span class = "hljs-type" > HashType< / span > .sigHashAll)
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< span class = "hljs-comment" > // utxoInfo: ScriptSignatureParams[P2PKHInputInfo] = ScriptSignatureParams(P2PKHInputInfo(TransactionOutPoint(ba5a46fec3f4fb0e6517ed6fa5322824dbd592f2c2bd61ae987c0698f877dbf5:0),10000 sats,ECPublicKey(022e844ef714c5e8b9d8ee19b527aede3763585009d4db38c5b01fc82bfea010ed)),BaseTransaction(Int32Impl(1),Vector(),Vector(TransactionOutput(10000 sats,pkh(eeba2cbd2eb4d4cac2aef40a50ce65057278ca21))),UInt32Impl(0)),Vector(Masked(ECPrivateKey)),SIGHASH_ALL(1))< / span >
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< 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)
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< span class = "hljs-comment" > // utxoInfos: Vector[ScriptSignatureParams[InputInfo]] = Vector(ScriptSignatureParams(P2PKHInputInfo(TransactionOutPoint(ba5a46fec3f4fb0e6517ed6fa5322824dbd592f2c2bd61ae987c0698f877dbf5:0),10000 sats,ECPublicKey(022e844ef714c5e8b9d8ee19b527aede3763585009d4db38c5b01fc82bfea010ed)),BaseTransaction(Int32Impl(1),Vector(),Vector(TransactionOutput(10000 sats,pkh(eeba2cbd2eb4d4cac2aef40a50ce65057278ca21))),UInt32Impl(0)),Vector(Masked(ECPrivateKey)),SIGHASH_ALL(1)))< / span >
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< span class = "hljs-comment" > // Yay! Now we use the RawTxSigner object to sign the tx.< / span >
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< span class = "hljs-comment" > // The 'sign' method is going produce a validly signed transaction< / span >
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< span class = "hljs-comment" > // This is going to iterate through each of the UTXOs and use< / span >
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< span class = "hljs-comment" > // the corresponding ScriptSignatureParams to produce a validly< / span >
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< 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 >
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< 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
)
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< span class = "hljs-comment" > // signedTx: Transaction = BaseTransaction(Int32Impl(2),Vector(TransactionInputImpl(TransactionOutPoint(ba5a46fec3f4fb0e6517ed6fa5322824dbd592f2c2bd61ae987c0698f877dbf5:0),P2PKHScriptSignature(ECPublicKeyBytes(ByteVector(33 bytes, 0x022e844ef714c5e8b9d8ee19b527aede3763585009d4db38c5b01fc82bfea010ed)), ECDigitalSignature(304402202f9566cd7c981f157704e2cf2f7c21f24768244977a2ffd94caeff18284f10e7022019c500e3f2f1169b9d744f07fd16fd8144213d335cd6f20aed49fb26a7427f3b01)),UInt32Impl(0))),Vector(TransactionOutput(5000 sats,pkh(47292e3b8acd9c36d7520602474dea519d11f4c6)), TransactionOutput(4775 sats,pkh(c0439dfe4e5867d820746dcea5bd19d1479f3ef7))),UInt32Impl(0))< / span >
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< / code > < / pre >
< pre > < code class = "hljs css language-scala" > signedTx.inputs.length
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< span class = "hljs-comment" > // res2: Int = 1< / span >
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signedTx.outputs.length
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< span class = "hljs-comment" > // res3: Int = 2< / span >
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< 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" > // res4: String = 0200000001f5db77f898067c98ae61bdc2f292d5db242832a56fed17650efbf4c3fe465aba000000006a47304402202f9566cd7c981f157704e2cf2f7c21f24768244977a2ffd94caeff18284f10e7022019c500e3f2f1169b9d744f07fd16fd8144213d335cd6f20aed49fb26a7427f3b0121022e844ef714c5e8b9d8ee19b527aede3763585009d4db38c5b01fc82bfea010ed000000000288130000000000001976a91447292e3b8acd9c36d7520602474dea519d11f4c688aca7120000000000001976a914c0439dfe4e5867d820746dcea5bd19d1479f3ef788ac00000000< / span >
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< / code > < / pre >
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