TxBuilder Example
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
implicit val ec: ExecutionContext = ExecutionContext.Implicits.global
-// ec: ExecutionContext = scala.concurrent.impl.ExecutionContextImpl$$anon$3@430c3fca[Running, parallelism = 2, size = 2, active = 0, running = 0, steals = 35, tasks = 0, submissions = 0]
+// ec: ExecutionContext = scala.concurrent.impl.ExecutionContextImpl$$anon$3@49b3e5b6[Running, parallelism = 2, size = 2, active = 0, running = 0, steals = 33, tasks = 0, submissions = 0]
// Initialize a transaction builder
val builder = RawTxBuilder()
@@ -74,19 +74,19 @@
val privKey = ECPrivateKey.freshPrivateKey
// privKey: ECPrivateKey = Masked(ECPrivateKeyImpl)
val pubKey = privKey.publicKey
-// pubKey: ECPublicKey = ECPublicKey(038d55230b81f1ae7cb9fc9de62a792c0df305c90a7db33154aff10fc9d0d711c8)
+// pubKey: ECPublicKey = ECPublicKey(03c818ef5a09da89bcdf3025a2eaf53c9d87f1748f6a8eff68adcf17b069dbec1f)
// this is the script that the TxBuilder is going to create a
// script signature that validly spends this scriptPubKey
val creditingSpk = P2PKHScriptPubKey(pubKey = privKey.publicKey)
-// creditingSpk: P2PKHScriptPubKey = pkh(8fb030665fd739d4ddb9b4e423eabf05627fa6eb)
+// creditingSpk: P2PKHScriptPubKey = pkh(f2f249163c06f05a56401355bb0dbe800d69f692)
val amount = 10000.satoshis
// amount: Satoshis = 10000 sats
// this is the UTXO we are going to be spending
val utxo =
TransactionOutput(value = amount, scriptPubKey = creditingSpk)
-// utxo: TransactionOutput = TransactionOutput(10000 sats,pkh(8fb030665fd739d4ddb9b4e423eabf05627fa6eb))
+// utxo: TransactionOutput = TransactionOutput(10000 sats,pkh(f2f249163c06f05a56401355bb0dbe800d69f692))
// the private key that locks the funds for the script we are spending too
val destinationPrivKey = ECPrivateKey.freshPrivateKey
@@ -99,7 +99,7 @@
// the script that corresponds to destination private key, this is what is receiving the money
val destinationSPK =
P2PKHScriptPubKey(pubKey = destinationPrivKey.publicKey)
-// destinationSPK: P2PKHScriptPubKey = pkh(9eb31f1fc5646e771b31871ecc817307c6a8c582)
+// destinationSPK: P2PKHScriptPubKey = pkh(b8ee166dd2d7dfb2c508fa7939520c97cc67b2e5)
// this is where we are sending money too
// we could add more destinations here if we
@@ -110,7 +110,7 @@
Vector(destination0)
}
-// destinations: Vector[TransactionOutput] = Vector(TransactionOutput(5000 sats,pkh(9eb31f1fc5646e771b31871ecc817307c6a8c582)))
+// destinations: Vector[TransactionOutput] = Vector(TransactionOutput(5000 sats,pkh(b8ee166dd2d7dfb2c508fa7939520c97cc67b2e5)))
// Add the destinations to the tx builder
builder ++= destinations
@@ -123,17 +123,17 @@ builder ++= destinations
inputs = Vector.empty,
outputs = Vector(utxo),
lockTime = UInt32.zero)
-// creditingTx: BaseTransaction = BaseTransaction(Int32Impl(1),Vector(),Vector(TransactionOutput(10000 sats,pkh(8fb030665fd739d4ddb9b4e423eabf05627fa6eb))),UInt32Impl(0))
+// creditingTx: BaseTransaction = BaseTransaction(Int32Impl(1),Vector(),Vector(TransactionOutput(10000 sats,pkh(f2f249163c06f05a56401355bb0dbe800d69f692))),UInt32Impl(0))
// this is the information we need from the crediting TX
// to properly "link" it in the transaction we are creating
val outPoint = TransactionOutPoint(creditingTx.txId, UInt32.zero)
-// outPoint: TransactionOutPoint = TransactionOutPoint(f68cb76056249edd5de042b1c4b508c8e6c80f62952454211d24b1f611ed741c:0)
+// outPoint: TransactionOutPoint = TransactionOutPoint(51ab88bd9d152928962cb1500ec68c06722967b9a756a62f742e47296d321c29:0)
val input = TransactionInput(
outPoint,
EmptyScriptSignature,
sequenceNumber = UInt32.zero)
-// input: TransactionInput = TransactionInputImpl(TransactionOutPoint(f68cb76056249edd5de042b1c4b508c8e6c80f62952454211d24b1f611ed741c:0),EmptyScriptSignature,UInt32Impl(0))
+// input: TransactionInput = TransactionInputImpl(TransactionOutPoint(51ab88bd9d152928962cb1500ec68c06722967b9a756a62f742e47296d321c29:0),EmptyScriptSignature,UInt32Impl(0))
// Add a new input to our builder
builder += input
@@ -141,11 +141,11 @@ builder += input
// We can now generate a RawTxBuilderResult ready to be finalized
val builderResult = builder.result()
-// builderResult: RawTxBuilderResult = RawTxBuilderResult(Int32Impl(2),Vector(TransactionInputImpl(TransactionOutPoint(f68cb76056249edd5de042b1c4b508c8e6c80f62952454211d24b1f611ed741c:0),EmptyScriptSignature,UInt32Impl(0))),Vector(TransactionOutput(5000 sats,pkh(9eb31f1fc5646e771b31871ecc817307c6a8c582))),UInt32Impl(0))
+// builderResult: RawTxBuilderResult = RawTxBuilderResult(Int32Impl(2),Vector(TransactionInputImpl(TransactionOutPoint(51ab88bd9d152928962cb1500ec68c06722967b9a756a62f742e47296d321c29:0),EmptyScriptSignature,UInt32Impl(0))),Vector(TransactionOutput(5000 sats,pkh(b8ee166dd2d7dfb2c508fa7939520c97cc67b2e5))),UInt32Impl(0))
// this contains the information needed to analyze our input during finalization
val inputInfo = P2PKHInputInfo(outPoint, amount, privKey.publicKey)
-// inputInfo: P2PKHInputInfo = P2PKHInputInfo(TransactionOutPoint(f68cb76056249edd5de042b1c4b508c8e6c80f62952454211d24b1f611ed741c:0),10000 sats,ECPublicKey(038d55230b81f1ae7cb9fc9de62a792c0df305c90a7db33154aff10fc9d0d711c8))
+// inputInfo: P2PKHInputInfo = P2PKHInputInfo(TransactionOutPoint(51ab88bd9d152928962cb1500ec68c06722967b9a756a62f742e47296d321c29:0),10000 sats,ECPublicKey(03c818ef5a09da89bcdf3025a2eaf53c9d87f1748f6a8eff68adcf17b069dbec1f))
// this is how much we are going to pay as a fee to the network
// for this example, we are going to pay 1 satoshi per byte
@@ -155,18 +155,18 @@ builder += input
val changePrivKey = ECPrivateKey.freshPrivateKey
// changePrivKey: ECPrivateKey = Masked(ECPrivateKeyImpl)
val changeSPK = P2PKHScriptPubKey(pubKey = changePrivKey.publicKey)
-// changeSPK: P2PKHScriptPubKey = pkh(4a68a4dfaa5715b53d2f34ec93f9ea230bb393cb)
+// changeSPK: P2PKHScriptPubKey = pkh(5307eeaa88ee7bc7c9bb3b2a0bed991bbaa5828a)
// We chose a finalizer that adds a change output to our tx based on a fee rate
val finalizer = StandardNonInteractiveFinalizer(
Vector(inputInfo),
feeRate,
changeSPK)
-// finalizer: StandardNonInteractiveFinalizer = StandardNonInteractiveFinalizer(Vector(P2PKHInputInfo(TransactionOutPoint(f68cb76056249edd5de042b1c4b508c8e6c80f62952454211d24b1f611ed741c:0),10000 sats,ECPublicKey(038d55230b81f1ae7cb9fc9de62a792c0df305c90a7db33154aff10fc9d0d711c8))),1 sats/byte,pkh(4a68a4dfaa5715b53d2f34ec93f9ea230bb393cb))
+// finalizer: StandardNonInteractiveFinalizer = StandardNonInteractiveFinalizer(Vector(P2PKHInputInfo(TransactionOutPoint(51ab88bd9d152928962cb1500ec68c06722967b9a756a62f742e47296d321c29:0),10000 sats,ECPublicKey(03c818ef5a09da89bcdf3025a2eaf53c9d87f1748f6a8eff68adcf17b069dbec1f))),1 sats/byte,pkh(5307eeaa88ee7bc7c9bb3b2a0bed991bbaa5828a))
// We can now finalize the tx builder result from earlier with this finalizer
val unsignedTxF: Future[Transaction] = finalizer.buildTx(builderResult)
-// unsignedTxF: Future[Transaction] = Future(Success(BaseTransaction(Int32Impl(2),Vector(TransactionInputImpl(TransactionOutPoint(f68cb76056249edd5de042b1c4b508c8e6c80f62952454211d24b1f611ed741c:0),EmptyScriptSignature,UInt32Impl(0))),Vector(TransactionOutput(5000 sats,pkh(9eb31f1fc5646e771b31871ecc817307c6a8c582)), TransactionOutput(4775 sats,pkh(4a68a4dfaa5715b53d2f34ec93f9ea230bb393cb))),UInt32Impl(0))))
+// unsignedTxF: Future[Transaction] = Future(Success(BaseTransaction(Int32Impl(2),Vector(TransactionInputImpl(TransactionOutPoint(51ab88bd9d152928962cb1500ec68c06722967b9a756a62f742e47296d321c29:0),EmptyScriptSignature,UInt32Impl(0))),Vector(TransactionOutput(5000 sats,pkh(b8ee166dd2d7dfb2c508fa7939520c97cc67b2e5)), TransactionOutput(4775 sats,pkh(5307eeaa88ee7bc7c9bb3b2a0bed991bbaa5828a))),UInt32Impl(0))))
// We now turn to signing the unsigned transaction
// this contains all the information we need to
@@ -176,12 +176,12 @@ builder += input
signers = Vector(privKey),
hashType =
HashType.sigHashAll)
-// utxoInfo: ScriptSignatureParams[P2PKHInputInfo] = ScriptSignatureParams(P2PKHInputInfo(TransactionOutPoint(f68cb76056249edd5de042b1c4b508c8e6c80f62952454211d24b1f611ed741c:0),10000 sats,ECPublicKey(038d55230b81f1ae7cb9fc9de62a792c0df305c90a7db33154aff10fc9d0d711c8)),BaseTransaction(Int32Impl(1),Vector(),Vector(TransactionOutput(10000 sats,pkh(8fb030665fd739d4ddb9b4e423eabf05627fa6eb))),UInt32Impl(0)),Vector(Masked(ECPrivateKeyImpl)),SIGHASH_ALL(Int32Impl(1)))
+// utxoInfo: ScriptSignatureParams[P2PKHInputInfo] = ScriptSignatureParams(P2PKHInputInfo(TransactionOutPoint(51ab88bd9d152928962cb1500ec68c06722967b9a756a62f742e47296d321c29:0),10000 sats,ECPublicKey(03c818ef5a09da89bcdf3025a2eaf53c9d87f1748f6a8eff68adcf17b069dbec1f)),BaseTransaction(Int32Impl(1),Vector(),Vector(TransactionOutput(10000 sats,pkh(f2f249163c06f05a56401355bb0dbe800d69f692))),UInt32Impl(0)),Vector(Masked(ECPrivateKeyImpl)),SIGHASH_ALL(Int32Impl(1)))
// all of the UTXO spending information, since we only have
// one input, this is just one element
val utxoInfos: Vector[ScriptSignatureParams[InputInfo]] = Vector(utxoInfo)
-// utxoInfos: Vector[ScriptSignatureParams[InputInfo]] = Vector(ScriptSignatureParams(P2PKHInputInfo(TransactionOutPoint(f68cb76056249edd5de042b1c4b508c8e6c80f62952454211d24b1f611ed741c:0),10000 sats,ECPublicKey(038d55230b81f1ae7cb9fc9de62a792c0df305c90a7db33154aff10fc9d0d711c8)),BaseTransaction(Int32Impl(1),Vector(),Vector(TransactionOutput(10000 sats,pkh(8fb030665fd739d4ddb9b4e423eabf05627fa6eb))),UInt32Impl(0)),Vector(Masked(ECPrivateKeyImpl)),SIGHASH_ALL(Int32Impl(1))))
+// utxoInfos: Vector[ScriptSignatureParams[InputInfo]] = Vector(ScriptSignatureParams(P2PKHInputInfo(TransactionOutPoint(51ab88bd9d152928962cb1500ec68c06722967b9a756a62f742e47296d321c29:0),10000 sats,ECPublicKey(03c818ef5a09da89bcdf3025a2eaf53c9d87f1748f6a8eff68adcf17b069dbec1f)),BaseTransaction(Int32Impl(1),Vector(),Vector(TransactionOutput(10000 sats,pkh(f2f249163c06f05a56401355bb0dbe800d69f692))),UInt32Impl(0)),Vector(Masked(ECPrivateKeyImpl)),SIGHASH_ALL(Int32Impl(1))))
// Yay! Now we use the RawTxSigner object to sign the tx.
// The 'sign' method is going produce a validly signed transaction
@@ -201,7 +201,7 @@ builder += input
}
Await.result(signedTxF, 30.seconds)
}
-// signedTx: Transaction = BaseTransaction(Int32Impl(2),Vector(TransactionInputImpl(TransactionOutPoint(f68cb76056249edd5de042b1c4b508c8e6c80f62952454211d24b1f611ed741c:0),P2PKHScriptSignature(ECPublicKey(038d55230b81f1ae7cb9fc9de62a792c0df305c90a7db33154aff10fc9d0d711c8), ECDigitalSignature(304402207138ba31cb81822d9570bad1f9090bc8925da668d2e8ce2088b09239a337241602201b05c2204775c8f697f5ad1acea4c0ddb74c577078b0b296a5ba8ceef00b6cda01)),UInt32Impl(0))),Vector(TransactionOutput(5000 sats,pkh(9eb31f1fc5646e771b31871ecc817307c6a8c582)), TransactionOutput(4775 sats,pkh(4a68a4dfaa5715b53d2f34ec93f9ea230bb393cb))),UInt32Impl(0))
+// signedTx: Transaction = BaseTransaction(Int32Impl(2),Vector(TransactionInputImpl(TransactionOutPoint(51ab88bd9d152928962cb1500ec68c06722967b9a756a62f742e47296d321c29:0),P2PKHScriptSignature(ECPublicKey(03c818ef5a09da89bcdf3025a2eaf53c9d87f1748f6a8eff68adcf17b069dbec1f), ECDigitalSignature(30440220637448b2fac31a0145a114429497cc14582c587d77fcb97b0aecdc16da46b3fc02206e3da8f21e0e7f618f092cf6331f0854d59e966d845fbe3c2d01332f44659c5601)),UInt32Impl(0))),Vector(TransactionOutput(5000 sats,pkh(b8ee166dd2d7dfb2c508fa7939520c97cc67b2e5)), TransactionOutput(4775 sats,pkh(5307eeaa88ee7bc7c9bb3b2a0bed991bbaa5828a))),UInt32Impl(0))
signedTx.inputs.length
// res2: Int = 1
@@ -211,7 +211,7 @@ signedTx.outputs.length
//remember, you can call .hex on any bitcoin-s data structure to get the hex representation!
signedTx.hex
-// res4: String = 02000000011c74ed11f6b1241d21542495620fc8e6c808b5c4b142e05ddd9e245660b78cf6000000006a47304402207138ba31cb81822d9570bad1f9090bc8925da668d2e8ce2088b09239a337241602201b05c2204775c8f697f5ad1acea4c0ddb74c577078b0b296a5ba8ceef00b6cda0121038d55230b81f1ae7cb9fc9de62a792c0df305c90a7db33154aff10fc9d0d711c8000000000288130000000000001976a9149eb31f1fc5646e771b31871ecc817307c6a8c58288aca7120000000000001976a9144a68a4dfaa5715b53d2f34ec93f9ea230bb393cb88ac00000000
+// res4: String = 0200000001291c326d29472e742fa656a7b9672972068cc60e50b12c962829159dbd88ab51000000006a4730440220637448b2fac31a0145a114429497cc14582c587d77fcb97b0aecdc16da46b3fc02206e3da8f21e0e7f618f092cf6331f0854d59e966d845fbe3c2d01332f44659c56012103c818ef5a09da89bcdf3025a2eaf53c9d87f1748f6a8eff68adcf17b069dbec1f000000000288130000000000001976a914b8ee166dd2d7dfb2c508fa7939520c97cc67b2e588aca7120000000000001976a9145307eeaa88ee7bc7c9bb3b2a0bed991bbaa5828a88ac00000000