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$$anon$3@65a0449b[Running, parallelism = 2, size = 2, active = 0, running = 0, steals = 37, tasks = 0, submissions = 0]
+// ec: ExecutionContext = scala.concurrent.impl.ExecutionContextImpl$$anon$3@1a148339[Running, parallelism = 2, size = 2, active = 0, running = 0, steals = 35, 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(0332e85cf725fbaebd583529a16d5f07a165b54c414e10c1269ac5b0a3996021fa)
+// pubKey: ECPublicKey = ECPublicKey(02e11fafde75d309432d5aa0474214f5b05374bb3defd4cccf9e7acb73f89453e2)
// 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(757c90a4d66d81bad37d06da1420aa0b81731da8)
+// creditingSpk: P2PKHScriptPubKey = pkh(4497e5dfec86276e2387deea42c7d9f1cd5cd8dd)
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(757c90a4d66d81bad37d06da1420aa0b81731da8))
+// utxo: TransactionOutput = TransactionOutput(10000 sats,pkh(4497e5dfec86276e2387deea42c7d9f1cd5cd8dd))
// 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(60b69f66f0501e01637b4e442b58176c1a89c765)
+// destinationSPK: P2PKHScriptPubKey = pkh(09952c7031f4a9207298d47c497c2cd17de46ea9)
// 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(60b69f66f0501e01637b4e442b58176c1a89c765)))
+// destinations: Vector[TransactionOutput] = Vector(TransactionOutput(5000 sats,pkh(09952c7031f4a9207298d47c497c2cd17de46ea9)))
// 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(757c90a4d66d81bad37d06da1420aa0b81731da8))),UInt32Impl(0))
+// creditingTx: BaseTransaction = BaseTransaction(Int32Impl(1),Vector(),Vector(TransactionOutput(10000 sats,pkh(4497e5dfec86276e2387deea42c7d9f1cd5cd8dd))),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(34136483fcfabf84c3ef6083d8a9ed0013d853242abf16bd0b813c5b183c2ee0:0)
+// outPoint: TransactionOutPoint = TransactionOutPoint(748ec89470b39f4778111c70d87f37cee9b73a9f3570b8078f1cfec7cedb2903:0)
val input = TransactionInput(
outPoint,
EmptyScriptSignature,
sequenceNumber = UInt32.zero)
-// input: TransactionInput = TransactionInputImpl(TransactionOutPoint(34136483fcfabf84c3ef6083d8a9ed0013d853242abf16bd0b813c5b183c2ee0:0),EmptyScriptSignature,UInt32Impl(0))
+// input: TransactionInput = TransactionInputImpl(TransactionOutPoint(748ec89470b39f4778111c70d87f37cee9b73a9f3570b8078f1cfec7cedb2903:0),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(34136483fcfabf84c3ef6083d8a9ed0013d853242abf16bd0b813c5b183c2ee0:0),EmptyScriptSignature,UInt32Impl(0))),Vector(TransactionOutput(5000 sats,pkh(60b69f66f0501e01637b4e442b58176c1a89c765))),UInt32Impl(0))
+// builderResult: RawTxBuilderResult = RawTxBuilderResult(Int32Impl(2),Vector(TransactionInputImpl(TransactionOutPoint(748ec89470b39f4778111c70d87f37cee9b73a9f3570b8078f1cfec7cedb2903:0),EmptyScriptSignature,UInt32Impl(0))),Vector(TransactionOutput(5000 sats,pkh(09952c7031f4a9207298d47c497c2cd17de46ea9))),UInt32Impl(0))
// this contains the information needed to analyze our input during finalization
val inputInfo = P2PKHInputInfo(outPoint, amount, privKey.publicKey)
-// inputInfo: P2PKHInputInfo = P2PKHInputInfo(TransactionOutPoint(34136483fcfabf84c3ef6083d8a9ed0013d853242abf16bd0b813c5b183c2ee0:0),10000 sats,ECPublicKey(0332e85cf725fbaebd583529a16d5f07a165b54c414e10c1269ac5b0a3996021fa))
+// inputInfo: P2PKHInputInfo = P2PKHInputInfo(TransactionOutPoint(748ec89470b39f4778111c70d87f37cee9b73a9f3570b8078f1cfec7cedb2903:0),10000 sats,ECPublicKey(02e11fafde75d309432d5aa0474214f5b05374bb3defd4cccf9e7acb73f89453e2))
// 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(ee378f723532f63d4e063b92fe0bf8855f8a11dd)
+// changeSPK: P2PKHScriptPubKey = pkh(2c8ee9509d07f62d0c36b1246308da971ebbc5bb)
// 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(34136483fcfabf84c3ef6083d8a9ed0013d853242abf16bd0b813c5b183c2ee0:0),10000 sats,ECPublicKey(0332e85cf725fbaebd583529a16d5f07a165b54c414e10c1269ac5b0a3996021fa))),1 sats/byte,pkh(ee378f723532f63d4e063b92fe0bf8855f8a11dd))
+// finalizer: StandardNonInteractiveFinalizer = StandardNonInteractiveFinalizer(Vector(P2PKHInputInfo(TransactionOutPoint(748ec89470b39f4778111c70d87f37cee9b73a9f3570b8078f1cfec7cedb2903:0),10000 sats,ECPublicKey(02e11fafde75d309432d5aa0474214f5b05374bb3defd4cccf9e7acb73f89453e2))),1 sats/byte,pkh(2c8ee9509d07f62d0c36b1246308da971ebbc5bb))
// 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(34136483fcfabf84c3ef6083d8a9ed0013d853242abf16bd0b813c5b183c2ee0:0),EmptyScriptSignature,UInt32Impl(0))),Vector(TransactionOutput(5000 sats,pkh(60b69f66f0501e01637b4e442b58176c1a89c765)), TransactionOutput(4775 sats,pkh(ee378f723532f63d4e063b92fe0bf8855f8a11dd))),UInt32Impl(0))))
+// unsignedTxF: Future[Transaction] = Future(Success(BaseTransaction(Int32Impl(2),Vector(TransactionInputImpl(TransactionOutPoint(748ec89470b39f4778111c70d87f37cee9b73a9f3570b8078f1cfec7cedb2903:0),EmptyScriptSignature,UInt32Impl(0))),Vector(TransactionOutput(5000 sats,pkh(09952c7031f4a9207298d47c497c2cd17de46ea9)), TransactionOutput(4775 sats,pkh(2c8ee9509d07f62d0c36b1246308da971ebbc5bb))),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(34136483fcfabf84c3ef6083d8a9ed0013d853242abf16bd0b813c5b183c2ee0:0),10000 sats,ECPublicKey(0332e85cf725fbaebd583529a16d5f07a165b54c414e10c1269ac5b0a3996021fa)),BaseTransaction(Int32Impl(1),Vector(),Vector(TransactionOutput(10000 sats,pkh(757c90a4d66d81bad37d06da1420aa0b81731da8))),UInt32Impl(0)),Vector(Masked(ECPrivateKeyImpl)),SIGHASH_ALL(Int32Impl(1)))
+// utxoInfo: ScriptSignatureParams[P2PKHInputInfo] = ScriptSignatureParams(P2PKHInputInfo(TransactionOutPoint(748ec89470b39f4778111c70d87f37cee9b73a9f3570b8078f1cfec7cedb2903:0),10000 sats,ECPublicKey(02e11fafde75d309432d5aa0474214f5b05374bb3defd4cccf9e7acb73f89453e2)),BaseTransaction(Int32Impl(1),Vector(),Vector(TransactionOutput(10000 sats,pkh(4497e5dfec86276e2387deea42c7d9f1cd5cd8dd))),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(34136483fcfabf84c3ef6083d8a9ed0013d853242abf16bd0b813c5b183c2ee0:0),10000 sats,ECPublicKey(0332e85cf725fbaebd583529a16d5f07a165b54c414e10c1269ac5b0a3996021fa)),BaseTransaction(Int32Impl(1),Vector(),Vector(TransactionOutput(10000 sats,pkh(757c90a4d66d81bad37d06da1420aa0b81731da8))),UInt32Impl(0)),Vector(Masked(ECPrivateKeyImpl)),SIGHASH_ALL(Int32Impl(1))))
+// utxoInfos: Vector[ScriptSignatureParams[InputInfo]] = Vector(ScriptSignatureParams(P2PKHInputInfo(TransactionOutPoint(748ec89470b39f4778111c70d87f37cee9b73a9f3570b8078f1cfec7cedb2903:0),10000 sats,ECPublicKey(02e11fafde75d309432d5aa0474214f5b05374bb3defd4cccf9e7acb73f89453e2)),BaseTransaction(Int32Impl(1),Vector(),Vector(TransactionOutput(10000 sats,pkh(4497e5dfec86276e2387deea42c7d9f1cd5cd8dd))),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(34136483fcfabf84c3ef6083d8a9ed0013d853242abf16bd0b813c5b183c2ee0:0),P2PKHScriptSignature(ECPublicKey(0332e85cf725fbaebd583529a16d5f07a165b54c414e10c1269ac5b0a3996021fa), ECDigitalSignature(30440220294b7d530d74ece7806746af1f29b7bdad24e1ef8c52595a900adec202e75c800220436a4cea569b0f092f2f4488f23bc9d841e50e13c493bd2287aecb3fdc32c30d01)),UInt32Impl(0))),Vector(TransactionOutput(5000 sats,pkh(60b69f66f0501e01637b4e442b58176c1a89c765)), TransactionOutput(4775 sats,pkh(ee378f723532f63d4e063b92fe0bf8855f8a11dd))),UInt32Impl(0))
+// signedTx: Transaction = BaseTransaction(Int32Impl(2),Vector(TransactionInputImpl(TransactionOutPoint(748ec89470b39f4778111c70d87f37cee9b73a9f3570b8078f1cfec7cedb2903:0),P2PKHScriptSignature(ECPublicKey(02e11fafde75d309432d5aa0474214f5b05374bb3defd4cccf9e7acb73f89453e2), ECDigitalSignature(30440220277f787a4eba6755773fc52bca4d59b4e09fea52783efa2896b20d1106d013cd02200cb5c331383ea03c0913acfe2ce978756d5d9df6aeb864917acfbdce1552da4d01)),UInt32Impl(0))),Vector(TransactionOutput(5000 sats,pkh(09952c7031f4a9207298d47c497c2cd17de46ea9)), TransactionOutput(4775 sats,pkh(2c8ee9509d07f62d0c36b1246308da971ebbc5bb))),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 = 0200000001e02e3c185b3c810bbd16bf2a2453d81300eda9d88360efc384bffafc83641334000000006a4730440220294b7d530d74ece7806746af1f29b7bdad24e1ef8c52595a900adec202e75c800220436a4cea569b0f092f2f4488f23bc9d841e50e13c493bd2287aecb3fdc32c30d01210332e85cf725fbaebd583529a16d5f07a165b54c414e10c1269ac5b0a3996021fa000000000288130000000000001976a91460b69f66f0501e01637b4e442b58176c1a89c76588aca7120000000000001976a914ee378f723532f63d4e063b92fe0bf8855f8a11dd88ac00000000
+// res4: String = 02000000010329dbcec7fe1c8f07b870359f3ab7e9ce377fd8701c1178479fb37094c88e74000000006a4730440220277f787a4eba6755773fc52bca4d59b4e09fea52783efa2896b20d1106d013cd02200cb5c331383ea03c0913acfe2ce978756d5d9df6aeb864917acfbdce1552da4d012102e11fafde75d309432d5aa0474214f5b05374bb3defd4cccf9e7acb73f89453e2000000000288130000000000001976a91409952c7031f4a9207298d47c497c2cd17de46ea988aca7120000000000001976a9142c8ee9509d07f62d0c36b1246308da971ebbc5bb88ac00000000