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$$anon$3@1b94df5d[Running, parallelism = 2, size = 2, active = 0, running = 0, steals = 33, tasks = 0, submissions = 0]
+// ec: ExecutionContext = scala.concurrent.impl.ExecutionContextImpl$$anon$3@d98b192[Running, parallelism = 2, size = 2, active = 0, running = 0, steals = 37, 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(0279f5fe40684bff9e1a901564b969eb7072a5d39e6440198cf90c8d9c070567dc)
+// pubKey: ECPublicKey = ECPublicKey(0286e4049a652ec37a97ceb79ed964dbdb993615ebcb867f38e712aed1c0b2e5e3)
// 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(29f3131e381531d1008e12ef349e8e300737ad69)
+// creditingSpk: P2PKHScriptPubKey = pkh(24f6616e8c2edfc86061d17b5c9b18dc7f860645)
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(29f3131e381531d1008e12ef349e8e300737ad69))
+// utxo: TransactionOutput = TransactionOutput(10000 sats,pkh(24f6616e8c2edfc86061d17b5c9b18dc7f860645))
// 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(dd5ff253cec828c9681ce3d8ddae71dbc8cf5cbb)
+// destinationSPK: P2PKHScriptPubKey = pkh(1142a53f69974991b374c8b18d1642583239564c)
// 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(dd5ff253cec828c9681ce3d8ddae71dbc8cf5cbb)))
+// destinations: Vector[TransactionOutput] = Vector(TransactionOutput(5000 sats,pkh(1142a53f69974991b374c8b18d1642583239564c)))
// 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(29f3131e381531d1008e12ef349e8e300737ad69))),UInt32Impl(0))
+// creditingTx: BaseTransaction = BaseTransaction(Int32Impl(1),Vector(),Vector(TransactionOutput(10000 sats,pkh(24f6616e8c2edfc86061d17b5c9b18dc7f860645))),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(2edc8ce72523f8fca18af357261992269b94344ace9ee6265a690e1a09c9e822:0)
+// outPoint: TransactionOutPoint = TransactionOutPoint(99c878a4537d85c4575ca03ce8c17f2a430a0a9829023bbd545d981c9af96092:0)
val input = TransactionInput(
outPoint,
EmptyScriptSignature,
sequenceNumber = UInt32.zero)
-// input: TransactionInput = TransactionInputImpl(TransactionOutPoint(2edc8ce72523f8fca18af357261992269b94344ace9ee6265a690e1a09c9e822:0),EmptyScriptSignature,UInt32Impl(0))
+// input: TransactionInput = TransactionInputImpl(TransactionOutPoint(99c878a4537d85c4575ca03ce8c17f2a430a0a9829023bbd545d981c9af96092:0),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(2edc8ce72523f8fca18af357261992269b94344ace9ee6265a690e1a09c9e822:0),EmptyScriptSignature,UInt32Impl(0))),Vector(TransactionOutput(5000 sats,pkh(dd5ff253cec828c9681ce3d8ddae71dbc8cf5cbb))),UInt32Impl(0))
+// builderResult: RawTxBuilderResult = RawTxBuilderResult(Int32Impl(2),Vector(TransactionInputImpl(TransactionOutPoint(99c878a4537d85c4575ca03ce8c17f2a430a0a9829023bbd545d981c9af96092:0),EmptyScriptSignature,UInt32Impl(0))),Vector(TransactionOutput(5000 sats,pkh(1142a53f69974991b374c8b18d1642583239564c))),UInt32Impl(0))
// this contains the information needed to analyze our input during finalization
val inputInfo = P2PKHInputInfo(outPoint, amount, privKey.publicKey)
-// inputInfo: P2PKHInputInfo = P2PKHInputInfo(TransactionOutPoint(2edc8ce72523f8fca18af357261992269b94344ace9ee6265a690e1a09c9e822:0),10000 sats,ECPublicKey(0279f5fe40684bff9e1a901564b969eb7072a5d39e6440198cf90c8d9c070567dc))
+// inputInfo: P2PKHInputInfo = P2PKHInputInfo(TransactionOutPoint(99c878a4537d85c4575ca03ce8c17f2a430a0a9829023bbd545d981c9af96092:0),10000 sats,ECPublicKey(0286e4049a652ec37a97ceb79ed964dbdb993615ebcb867f38e712aed1c0b2e5e3))
// 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(71570e59c58e9959dcf729d1dc681dc6235d7d0a)
+// changeSPK: P2PKHScriptPubKey = pkh(4299d022d63db5a36161ef07e2063b6554b41641)
// 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(2edc8ce72523f8fca18af357261992269b94344ace9ee6265a690e1a09c9e822:0),10000 sats,ECPublicKey(0279f5fe40684bff9e1a901564b969eb7072a5d39e6440198cf90c8d9c070567dc))),1 sats/byte,pkh(71570e59c58e9959dcf729d1dc681dc6235d7d0a))
+// finalizer: StandardNonInteractiveFinalizer = StandardNonInteractiveFinalizer(Vector(P2PKHInputInfo(TransactionOutPoint(99c878a4537d85c4575ca03ce8c17f2a430a0a9829023bbd545d981c9af96092:0),10000 sats,ECPublicKey(0286e4049a652ec37a97ceb79ed964dbdb993615ebcb867f38e712aed1c0b2e5e3))),1 sats/byte,pkh(4299d022d63db5a36161ef07e2063b6554b41641))
// 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(2edc8ce72523f8fca18af357261992269b94344ace9ee6265a690e1a09c9e822:0),EmptyScriptSignature,UInt32Impl(0))),Vector(TransactionOutput(5000 sats,pkh(dd5ff253cec828c9681ce3d8ddae71dbc8cf5cbb)), TransactionOutput(4775 sats,pkh(71570e59c58e9959dcf729d1dc681dc6235d7d0a))),UInt32Impl(0))))
+// unsignedTxF: Future[Transaction] = Future(Success(BaseTransaction(Int32Impl(2),Vector(TransactionInputImpl(TransactionOutPoint(99c878a4537d85c4575ca03ce8c17f2a430a0a9829023bbd545d981c9af96092:0),EmptyScriptSignature,UInt32Impl(0))),Vector(TransactionOutput(5000 sats,pkh(1142a53f69974991b374c8b18d1642583239564c)), TransactionOutput(4775 sats,pkh(4299d022d63db5a36161ef07e2063b6554b41641))),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(2edc8ce72523f8fca18af357261992269b94344ace9ee6265a690e1a09c9e822:0),10000 sats,ECPublicKey(0279f5fe40684bff9e1a901564b969eb7072a5d39e6440198cf90c8d9c070567dc)),BaseTransaction(Int32Impl(1),Vector(),Vector(TransactionOutput(10000 sats,pkh(29f3131e381531d1008e12ef349e8e300737ad69))),UInt32Impl(0)),Vector(Masked(ECPrivateKeyImpl)),SIGHASH_ALL(Int32Impl(1)))
+// utxoInfo: ScriptSignatureParams[P2PKHInputInfo] = ScriptSignatureParams(P2PKHInputInfo(TransactionOutPoint(99c878a4537d85c4575ca03ce8c17f2a430a0a9829023bbd545d981c9af96092:0),10000 sats,ECPublicKey(0286e4049a652ec37a97ceb79ed964dbdb993615ebcb867f38e712aed1c0b2e5e3)),BaseTransaction(Int32Impl(1),Vector(),Vector(TransactionOutput(10000 sats,pkh(24f6616e8c2edfc86061d17b5c9b18dc7f860645))),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(2edc8ce72523f8fca18af357261992269b94344ace9ee6265a690e1a09c9e822:0),10000 sats,ECPublicKey(0279f5fe40684bff9e1a901564b969eb7072a5d39e6440198cf90c8d9c070567dc)),BaseTransaction(Int32Impl(1),Vector(),Vector(TransactionOutput(10000 sats,pkh(29f3131e381531d1008e12ef349e8e300737ad69))),UInt32Impl(0)),Vector(Masked(ECPrivateKeyImpl)),SIGHASH_ALL(Int32Impl(1))))
+// utxoInfos: Vector[ScriptSignatureParams[InputInfo]] = Vector(ScriptSignatureParams(P2PKHInputInfo(TransactionOutPoint(99c878a4537d85c4575ca03ce8c17f2a430a0a9829023bbd545d981c9af96092:0),10000 sats,ECPublicKey(0286e4049a652ec37a97ceb79ed964dbdb993615ebcb867f38e712aed1c0b2e5e3)),BaseTransaction(Int32Impl(1),Vector(),Vector(TransactionOutput(10000 sats,pkh(24f6616e8c2edfc86061d17b5c9b18dc7f860645))),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(2edc8ce72523f8fca18af357261992269b94344ace9ee6265a690e1a09c9e822:0),P2PKHScriptSignature(ECPublicKey(0279f5fe40684bff9e1a901564b969eb7072a5d39e6440198cf90c8d9c070567dc), ECDigitalSignature(304402201c005c83e344f3b168c3e77be0ea6b717cc47eb816d9d85f71a2b704d31fec8f02206d7facf1204e53e9225bae7c6151386414758560afd21a2f6c3534dee2ae08b601)),UInt32Impl(0))),Vector(TransactionOutput(5000 sats,pkh(dd5ff253cec828c9681ce3d8ddae71dbc8cf5cbb)), TransactionOutput(4775 sats,pkh(71570e59c58e9959dcf729d1dc681dc6235d7d0a))),UInt32Impl(0))
+// signedTx: Transaction = BaseTransaction(Int32Impl(2),Vector(TransactionInputImpl(TransactionOutPoint(99c878a4537d85c4575ca03ce8c17f2a430a0a9829023bbd545d981c9af96092:0),P2PKHScriptSignature(ECPublicKey(0286e4049a652ec37a97ceb79ed964dbdb993615ebcb867f38e712aed1c0b2e5e3), ECDigitalSignature(3044022013ec14e406264195ff733ef3ba10349afb1633650e31675af327d676df02b09d0220543ac32957a299d180a632a1789a5fb06d7c3d5bb115cf1f2fc0f961c0d1decd01)),UInt32Impl(0))),Vector(TransactionOutput(5000 sats,pkh(1142a53f69974991b374c8b18d1642583239564c)), TransactionOutput(4775 sats,pkh(4299d022d63db5a36161ef07e2063b6554b41641))),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 = 020000000122e8c9091a0e695a26e69ece4a34949b2692192657f38aa1fcf82325e78cdc2e000000006a47304402201c005c83e344f3b168c3e77be0ea6b717cc47eb816d9d85f71a2b704d31fec8f02206d7facf1204e53e9225bae7c6151386414758560afd21a2f6c3534dee2ae08b601210279f5fe40684bff9e1a901564b969eb7072a5d39e6440198cf90c8d9c070567dc000000000288130000000000001976a914dd5ff253cec828c9681ce3d8ddae71dbc8cf5cbb88aca7120000000000001976a91471570e59c58e9959dcf729d1dc681dc6235d7d0a88ac00000000
+// res4: String = 02000000019260f99a1c985d54bd3b0229980a0a432a7fc1e83ca05c57c4857d53a478c899000000006a473044022013ec14e406264195ff733ef3ba10349afb1633650e31675af327d676df02b09d0220543ac32957a299d180a632a1789a5fb06d7c3d5bb115cf1f2fc0f961c0d1decd01210286e4049a652ec37a97ceb79ed964dbdb993615ebcb867f38e712aed1c0b2e5e3000000000288130000000000001976a9141142a53f69974991b374c8b18d1642583239564c88aca7120000000000001976a9144299d022d63db5a36161ef07e2063b6554b4164188ac00000000