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$$anon$3@45d8fab5[Running, parallelism = 2, size = 2, active = 0, running = 0, steals = 43, tasks = 0, submissions = 0]
+// ec: ExecutionContext = scala.concurrent.impl.ExecutionContextImpl$$anon$3@5d85e757[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(03cbc7a9aca195fcffbee4dd7bc90137652f4616a6924dfc3efb3b1a812b423a33)
+// pubKey: ECPublicKey = ECPublicKey(0296c57b5649a6a678cbafb1e733d144a055bca9f2d4fbcf98a9442bcdcbfae7d3)
// 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(509622a93439551a0f0dd3fd469e7497eb05be17)
+// creditingSpk: P2PKHScriptPubKey = pkh(a478dc0cd7c59ba96d31d28231508eed9a19b472)
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(509622a93439551a0f0dd3fd469e7497eb05be17))
+// utxo: TransactionOutput = TransactionOutput(10000 sats,pkh(a478dc0cd7c59ba96d31d28231508eed9a19b472))
// 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(3fd35012596d28273a1ae94c4bffe00dd5534fb1)
+// destinationSPK: P2PKHScriptPubKey = pkh(560350fe57291d8b20fab223ec99563dcc2b84cb)
// 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(3fd35012596d28273a1ae94c4bffe00dd5534fb1)))
+// destinations: Vector[TransactionOutput] = Vector(TransactionOutput(5000 sats,pkh(560350fe57291d8b20fab223ec99563dcc2b84cb)))
// 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(509622a93439551a0f0dd3fd469e7497eb05be17))),UInt32Impl(0))
+// creditingTx: BaseTransaction = BaseTransaction(Int32Impl(1),Vector(),Vector(TransactionOutput(10000 sats,pkh(a478dc0cd7c59ba96d31d28231508eed9a19b472))),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(793ea9fb45fc809ef481bf409e85fa2f9f3b925bafd0d7f23b3fb58f8db48d71:0)
+// outPoint: TransactionOutPoint = TransactionOutPoint(1c4edb6432fc4e78b19328e20fd43bab9af7e8d16e219a7245c44730dddaa45f:0)
val input = TransactionInput(
outPoint,
EmptyScriptSignature,
sequenceNumber = UInt32.zero)
-// input: TransactionInput = TransactionInputImpl(TransactionOutPoint(793ea9fb45fc809ef481bf409e85fa2f9f3b925bafd0d7f23b3fb58f8db48d71:0),EmptyScriptSignature,UInt32Impl(0))
+// input: TransactionInput = TransactionInputImpl(TransactionOutPoint(1c4edb6432fc4e78b19328e20fd43bab9af7e8d16e219a7245c44730dddaa45f: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(793ea9fb45fc809ef481bf409e85fa2f9f3b925bafd0d7f23b3fb58f8db48d71:0),EmptyScriptSignature,UInt32Impl(0))),Vector(TransactionOutput(5000 sats,pkh(3fd35012596d28273a1ae94c4bffe00dd5534fb1))),UInt32Impl(0))
+// builderResult: RawTxBuilderResult = RawTxBuilderResult(Int32Impl(2),Vector(TransactionInputImpl(TransactionOutPoint(1c4edb6432fc4e78b19328e20fd43bab9af7e8d16e219a7245c44730dddaa45f:0),EmptyScriptSignature,UInt32Impl(0))),Vector(TransactionOutput(5000 sats,pkh(560350fe57291d8b20fab223ec99563dcc2b84cb))),UInt32Impl(0))
// this contains the information needed to analyze our input during finalization
val inputInfo = P2PKHInputInfo(outPoint, amount, privKey.publicKey)
-// inputInfo: P2PKHInputInfo = P2PKHInputInfo(TransactionOutPoint(793ea9fb45fc809ef481bf409e85fa2f9f3b925bafd0d7f23b3fb58f8db48d71:0),10000 sats,ECPublicKey(03cbc7a9aca195fcffbee4dd7bc90137652f4616a6924dfc3efb3b1a812b423a33))
+// inputInfo: P2PKHInputInfo = P2PKHInputInfo(TransactionOutPoint(1c4edb6432fc4e78b19328e20fd43bab9af7e8d16e219a7245c44730dddaa45f:0),10000 sats,ECPublicKey(0296c57b5649a6a678cbafb1e733d144a055bca9f2d4fbcf98a9442bcdcbfae7d3))
// 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(6c174d238a1c5b74d8b252f964bc08512f41c2b5)
+// changeSPK: P2PKHScriptPubKey = pkh(ad159aafa6affd37df6dfebd7a214b9201925637)
// 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(793ea9fb45fc809ef481bf409e85fa2f9f3b925bafd0d7f23b3fb58f8db48d71:0),10000 sats,ECPublicKey(03cbc7a9aca195fcffbee4dd7bc90137652f4616a6924dfc3efb3b1a812b423a33))),1 sats/byte,pkh(6c174d238a1c5b74d8b252f964bc08512f41c2b5))
+// finalizer: StandardNonInteractiveFinalizer = StandardNonInteractiveFinalizer(Vector(P2PKHInputInfo(TransactionOutPoint(1c4edb6432fc4e78b19328e20fd43bab9af7e8d16e219a7245c44730dddaa45f:0),10000 sats,ECPublicKey(0296c57b5649a6a678cbafb1e733d144a055bca9f2d4fbcf98a9442bcdcbfae7d3))),1 sats/byte,pkh(ad159aafa6affd37df6dfebd7a214b9201925637))
// 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(793ea9fb45fc809ef481bf409e85fa2f9f3b925bafd0d7f23b3fb58f8db48d71:0),EmptyScriptSignature,UInt32Impl(0))),Vector(TransactionOutput(5000 sats,pkh(3fd35012596d28273a1ae94c4bffe00dd5534fb1)), TransactionOutput(4775 sats,pkh(6c174d238a1c5b74d8b252f964bc08512f41c2b5))),UInt32Impl(0))))
+// unsignedTxF: Future[Transaction] = Future(Success(BaseTransaction(Int32Impl(2),Vector(TransactionInputImpl(TransactionOutPoint(1c4edb6432fc4e78b19328e20fd43bab9af7e8d16e219a7245c44730dddaa45f:0),EmptyScriptSignature,UInt32Impl(0))),Vector(TransactionOutput(5000 sats,pkh(560350fe57291d8b20fab223ec99563dcc2b84cb)), TransactionOutput(4775 sats,pkh(ad159aafa6affd37df6dfebd7a214b9201925637))),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(793ea9fb45fc809ef481bf409e85fa2f9f3b925bafd0d7f23b3fb58f8db48d71:0),10000 sats,ECPublicKey(03cbc7a9aca195fcffbee4dd7bc90137652f4616a6924dfc3efb3b1a812b423a33)),BaseTransaction(Int32Impl(1),Vector(),Vector(TransactionOutput(10000 sats,pkh(509622a93439551a0f0dd3fd469e7497eb05be17))),UInt32Impl(0)),Vector(Masked(ECPrivateKeyImpl)),SIGHASH_ALL(Int32Impl(1)))
+// utxoInfo: ScriptSignatureParams[P2PKHInputInfo] = ScriptSignatureParams(P2PKHInputInfo(TransactionOutPoint(1c4edb6432fc4e78b19328e20fd43bab9af7e8d16e219a7245c44730dddaa45f:0),10000 sats,ECPublicKey(0296c57b5649a6a678cbafb1e733d144a055bca9f2d4fbcf98a9442bcdcbfae7d3)),BaseTransaction(Int32Impl(1),Vector(),Vector(TransactionOutput(10000 sats,pkh(a478dc0cd7c59ba96d31d28231508eed9a19b472))),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(793ea9fb45fc809ef481bf409e85fa2f9f3b925bafd0d7f23b3fb58f8db48d71:0),10000 sats,ECPublicKey(03cbc7a9aca195fcffbee4dd7bc90137652f4616a6924dfc3efb3b1a812b423a33)),BaseTransaction(Int32Impl(1),Vector(),Vector(TransactionOutput(10000 sats,pkh(509622a93439551a0f0dd3fd469e7497eb05be17))),UInt32Impl(0)),Vector(Masked(ECPrivateKeyImpl)),SIGHASH_ALL(Int32Impl(1))))
+// utxoInfos: Vector[ScriptSignatureParams[InputInfo]] = Vector(ScriptSignatureParams(P2PKHInputInfo(TransactionOutPoint(1c4edb6432fc4e78b19328e20fd43bab9af7e8d16e219a7245c44730dddaa45f:0),10000 sats,ECPublicKey(0296c57b5649a6a678cbafb1e733d144a055bca9f2d4fbcf98a9442bcdcbfae7d3)),BaseTransaction(Int32Impl(1),Vector(),Vector(TransactionOutput(10000 sats,pkh(a478dc0cd7c59ba96d31d28231508eed9a19b472))),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(793ea9fb45fc809ef481bf409e85fa2f9f3b925bafd0d7f23b3fb58f8db48d71:0),P2PKHScriptSignature(ECPublicKey(03cbc7a9aca195fcffbee4dd7bc90137652f4616a6924dfc3efb3b1a812b423a33), ECDigitalSignature(30440220624b3995062cafb9df588d12f4cbdfbb2a90e02eed49f019766c34a8a22dfc0e022027ac831c50f7dbf08ffa04fd84a2aecaee8c93e569d4b031c204885f814384a201)),UInt32Impl(0))),Vector(TransactionOutput(5000 sats,pkh(3fd35012596d28273a1ae94c4bffe00dd5534fb1)), TransactionOutput(4775 sats,pkh(6c174d238a1c5b74d8b252f964bc08512f41c2b5))),UInt32Impl(0))
+// signedTx: Transaction = BaseTransaction(Int32Impl(2),Vector(TransactionInputImpl(TransactionOutPoint(1c4edb6432fc4e78b19328e20fd43bab9af7e8d16e219a7245c44730dddaa45f:0),P2PKHScriptSignature(ECPublicKey(0296c57b5649a6a678cbafb1e733d144a055bca9f2d4fbcf98a9442bcdcbfae7d3), ECDigitalSignature(3044022004a02a632f2c92c59fef07c97c5daec779256d66f1c6eedc0399e479d25243440220463758981fa121fb610f4f0052deec1fc73f8543bc3d3fc90cf0de9ddcc41df601)),UInt32Impl(0))),Vector(TransactionOutput(5000 sats,pkh(560350fe57291d8b20fab223ec99563dcc2b84cb)), TransactionOutput(4775 sats,pkh(ad159aafa6affd37df6dfebd7a214b9201925637))),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 = 0200000001718db48d8fb53f3bf2d7d0af5b923b9f2ffa859e40bf81f49e80fc45fba93e79000000006a4730440220624b3995062cafb9df588d12f4cbdfbb2a90e02eed49f019766c34a8a22dfc0e022027ac831c50f7dbf08ffa04fd84a2aecaee8c93e569d4b031c204885f814384a2012103cbc7a9aca195fcffbee4dd7bc90137652f4616a6924dfc3efb3b1a812b423a33000000000288130000000000001976a9143fd35012596d28273a1ae94c4bffe00dd5534fb188aca7120000000000001976a9146c174d238a1c5b74d8b252f964bc08512f41c2b588ac00000000
+// res4: String = 02000000015fa4dadd3047c445729a216ed1e8f79aab3bd40fe22893b1784efc3264db4e1c000000006a473044022004a02a632f2c92c59fef07c97c5daec779256d66f1c6eedc0399e479d25243440220463758981fa121fb610f4f0052deec1fc73f8543bc3d3fc90cf0de9ddcc41df601210296c57b5649a6a678cbafb1e733d144a055bca9f2d4fbcf98a9442bcdcbfae7d3000000000288130000000000001976a914560350fe57291d8b20fab223ec99563dcc2b84cb88aca7120000000000001976a914ad159aafa6affd37df6dfebd7a214b920192563788ac00000000