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$$anon$3@209feee5[Running, parallelism = 2, size = 2, active = 0, running = 0, steals = 35, tasks = 0, submissions = 0]
+// ec: ExecutionContext = scala.concurrent.impl.ExecutionContextImpl$$anon$3@48d66ae7[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(02f589c2aa610e0fac2d653f300643deb6f0166736a8b3472bc21cc0aaca8962f4)
+// pubKey: ECPublicKey = ECPublicKey(02b84591ab5ebeb0bfc6b4051eff7934e5b9389a52fdd3fad79a8315f50e51c6f0)
// 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(d9ef34d7a12b8d46a87d2a8ec8bd09b178dfce0b)
+// creditingSpk: P2PKHScriptPubKey = pkh(3c2cf74aae00636372eb1d96e198fdfc8aba43fe)
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(d9ef34d7a12b8d46a87d2a8ec8bd09b178dfce0b))
+// utxo: TransactionOutput = TransactionOutput(10000 sats,pkh(3c2cf74aae00636372eb1d96e198fdfc8aba43fe))
// 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(3f29799f4552b8b43f6b5a4c1e3ec9cc029e023a)
+// destinationSPK: P2PKHScriptPubKey = pkh(aba14c63f25fe9f63ab977f13008d06b670ed630)
// 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(3f29799f4552b8b43f6b5a4c1e3ec9cc029e023a)))
+// destinations: Vector[TransactionOutput] = Vector(TransactionOutput(5000 sats,pkh(aba14c63f25fe9f63ab977f13008d06b670ed630)))
// 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(d9ef34d7a12b8d46a87d2a8ec8bd09b178dfce0b))),UInt32Impl(0))
+// creditingTx: BaseTransaction = BaseTransaction(Int32Impl(1),Vector(),Vector(TransactionOutput(10000 sats,pkh(3c2cf74aae00636372eb1d96e198fdfc8aba43fe))),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(3bc8eb605fad39a1541b0f46d2e804499bd4705c38134486fc34b21a995a23b1:0)
+// outPoint: TransactionOutPoint = TransactionOutPoint(0345098ac930ed5d8ab7f777114bc28a405ec7ba02f917b7a9281c769a5f2096:0)
val input = TransactionInput(
outPoint,
EmptyScriptSignature,
sequenceNumber = UInt32.zero)
-// input: TransactionInput = TransactionInputImpl(TransactionOutPoint(3bc8eb605fad39a1541b0f46d2e804499bd4705c38134486fc34b21a995a23b1:0),EmptyScriptSignature,UInt32Impl(0))
+// input: TransactionInput = TransactionInputImpl(TransactionOutPoint(0345098ac930ed5d8ab7f777114bc28a405ec7ba02f917b7a9281c769a5f2096:0),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(3bc8eb605fad39a1541b0f46d2e804499bd4705c38134486fc34b21a995a23b1:0),EmptyScriptSignature,UInt32Impl(0))),Vector(TransactionOutput(5000 sats,pkh(3f29799f4552b8b43f6b5a4c1e3ec9cc029e023a))),UInt32Impl(0))
+// builderResult: RawTxBuilderResult = RawTxBuilderResult(Int32Impl(2),Vector(TransactionInputImpl(TransactionOutPoint(0345098ac930ed5d8ab7f777114bc28a405ec7ba02f917b7a9281c769a5f2096:0),EmptyScriptSignature,UInt32Impl(0))),Vector(TransactionOutput(5000 sats,pkh(aba14c63f25fe9f63ab977f13008d06b670ed630))),UInt32Impl(0))
// this contains the information needed to analyze our input during finalization
val inputInfo = P2PKHInputInfo(outPoint, amount, privKey.publicKey)
-// inputInfo: P2PKHInputInfo = P2PKHInputInfo(TransactionOutPoint(3bc8eb605fad39a1541b0f46d2e804499bd4705c38134486fc34b21a995a23b1:0),10000 sats,ECPublicKey(02f589c2aa610e0fac2d653f300643deb6f0166736a8b3472bc21cc0aaca8962f4))
+// inputInfo: P2PKHInputInfo = P2PKHInputInfo(TransactionOutPoint(0345098ac930ed5d8ab7f777114bc28a405ec7ba02f917b7a9281c769a5f2096:0),10000 sats,ECPublicKey(02b84591ab5ebeb0bfc6b4051eff7934e5b9389a52fdd3fad79a8315f50e51c6f0))
// 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(5aa29fe72fdd0cdde8886d057ef9c1f21d8b99ae)
+// changeSPK: P2PKHScriptPubKey = pkh(fd0a4fb5039a65e6063a7c45ba22f25ab8e06779)
// 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(3bc8eb605fad39a1541b0f46d2e804499bd4705c38134486fc34b21a995a23b1:0),10000 sats,ECPublicKey(02f589c2aa610e0fac2d653f300643deb6f0166736a8b3472bc21cc0aaca8962f4))),1 sats/byte,pkh(5aa29fe72fdd0cdde8886d057ef9c1f21d8b99ae))
+// finalizer: StandardNonInteractiveFinalizer = StandardNonInteractiveFinalizer(Vector(P2PKHInputInfo(TransactionOutPoint(0345098ac930ed5d8ab7f777114bc28a405ec7ba02f917b7a9281c769a5f2096:0),10000 sats,ECPublicKey(02b84591ab5ebeb0bfc6b4051eff7934e5b9389a52fdd3fad79a8315f50e51c6f0))),1 sats/byte,pkh(fd0a4fb5039a65e6063a7c45ba22f25ab8e06779))
// 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(3bc8eb605fad39a1541b0f46d2e804499bd4705c38134486fc34b21a995a23b1:0),EmptyScriptSignature,UInt32Impl(0))),Vector(TransactionOutput(5000 sats,pkh(3f29799f4552b8b43f6b5a4c1e3ec9cc029e023a)), TransactionOutput(4775 sats,pkh(5aa29fe72fdd0cdde8886d057ef9c1f21d8b99ae))),UInt32Impl(0))))
+// unsignedTxF: Future[Transaction] = Future(Success(BaseTransaction(Int32Impl(2),Vector(TransactionInputImpl(TransactionOutPoint(0345098ac930ed5d8ab7f777114bc28a405ec7ba02f917b7a9281c769a5f2096:0),EmptyScriptSignature,UInt32Impl(0))),Vector(TransactionOutput(5000 sats,pkh(aba14c63f25fe9f63ab977f13008d06b670ed630)), TransactionOutput(4775 sats,pkh(fd0a4fb5039a65e6063a7c45ba22f25ab8e06779))),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(3bc8eb605fad39a1541b0f46d2e804499bd4705c38134486fc34b21a995a23b1:0),10000 sats,ECPublicKey(02f589c2aa610e0fac2d653f300643deb6f0166736a8b3472bc21cc0aaca8962f4)),BaseTransaction(Int32Impl(1),Vector(),Vector(TransactionOutput(10000 sats,pkh(d9ef34d7a12b8d46a87d2a8ec8bd09b178dfce0b))),UInt32Impl(0)),Vector(Masked(ECPrivateKeyImpl)),SIGHASH_ALL(Int32Impl(1)))
+// utxoInfo: ScriptSignatureParams[P2PKHInputInfo] = ScriptSignatureParams(P2PKHInputInfo(TransactionOutPoint(0345098ac930ed5d8ab7f777114bc28a405ec7ba02f917b7a9281c769a5f2096:0),10000 sats,ECPublicKey(02b84591ab5ebeb0bfc6b4051eff7934e5b9389a52fdd3fad79a8315f50e51c6f0)),BaseTransaction(Int32Impl(1),Vector(),Vector(TransactionOutput(10000 sats,pkh(3c2cf74aae00636372eb1d96e198fdfc8aba43fe))),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(3bc8eb605fad39a1541b0f46d2e804499bd4705c38134486fc34b21a995a23b1:0),10000 sats,ECPublicKey(02f589c2aa610e0fac2d653f300643deb6f0166736a8b3472bc21cc0aaca8962f4)),BaseTransaction(Int32Impl(1),Vector(),Vector(TransactionOutput(10000 sats,pkh(d9ef34d7a12b8d46a87d2a8ec8bd09b178dfce0b))),UInt32Impl(0)),Vector(Masked(ECPrivateKeyImpl)),SIGHASH_ALL(Int32Impl(1))))
+// utxoInfos: Vector[ScriptSignatureParams[InputInfo]] = Vector(ScriptSignatureParams(P2PKHInputInfo(TransactionOutPoint(0345098ac930ed5d8ab7f777114bc28a405ec7ba02f917b7a9281c769a5f2096:0),10000 sats,ECPublicKey(02b84591ab5ebeb0bfc6b4051eff7934e5b9389a52fdd3fad79a8315f50e51c6f0)),BaseTransaction(Int32Impl(1),Vector(),Vector(TransactionOutput(10000 sats,pkh(3c2cf74aae00636372eb1d96e198fdfc8aba43fe))),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(3bc8eb605fad39a1541b0f46d2e804499bd4705c38134486fc34b21a995a23b1:0),P2PKHScriptSignature(ECPublicKey(02f589c2aa610e0fac2d653f300643deb6f0166736a8b3472bc21cc0aaca8962f4), ECDigitalSignature(3044022023446de237734a420b4b414a519ede8c53b30c08efd4d7ad6e143798f977f25f02202d408aed7ab48a6fcff806819fecc9191e644d1ee450334cd02606dad431360101)),UInt32Impl(0))),Vector(TransactionOutput(5000 sats,pkh(3f29799f4552b8b43f6b5a4c1e3ec9cc029e023a)), TransactionOutput(4775 sats,pkh(5aa29fe72fdd0cdde8886d057ef9c1f21d8b99ae))),UInt32Impl(0))
+// signedTx: Transaction = BaseTransaction(Int32Impl(2),Vector(TransactionInputImpl(TransactionOutPoint(0345098ac930ed5d8ab7f777114bc28a405ec7ba02f917b7a9281c769a5f2096:0),P2PKHScriptSignature(ECPublicKey(02b84591ab5ebeb0bfc6b4051eff7934e5b9389a52fdd3fad79a8315f50e51c6f0), ECDigitalSignature(304402204791bf471a912d08b3de97dfe7bd9a0e14fb31a8769ff52f57e4c4e0797beac202201e24c1232f484d29d72d5d956332b7f556e1f53de2c4b0142c6af569925fee6901)),UInt32Impl(0))),Vector(TransactionOutput(5000 sats,pkh(aba14c63f25fe9f63ab977f13008d06b670ed630)), TransactionOutput(4775 sats,pkh(fd0a4fb5039a65e6063a7c45ba22f25ab8e06779))),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 = 0200000001b1235a991ab234fc864413385c70d49b4904e8d2460f1b54a139ad5f60ebc83b000000006a473044022023446de237734a420b4b414a519ede8c53b30c08efd4d7ad6e143798f977f25f02202d408aed7ab48a6fcff806819fecc9191e644d1ee450334cd02606dad4313601012102f589c2aa610e0fac2d653f300643deb6f0166736a8b3472bc21cc0aaca8962f4000000000288130000000000001976a9143f29799f4552b8b43f6b5a4c1e3ec9cc029e023a88aca7120000000000001976a9145aa29fe72fdd0cdde8886d057ef9c1f21d8b99ae88ac00000000
+// res4: String = 020000000196205f9a761c28a9b717f902bac75e408ac24b1177f7b78a5ded30c98a094503000000006a47304402204791bf471a912d08b3de97dfe7bd9a0e14fb31a8769ff52f57e4c4e0797beac202201e24c1232f484d29d72d5d956332b7f556e1f53de2c4b0142c6af569925fee69012102b84591ab5ebeb0bfc6b4051eff7934e5b9389a52fdd3fad79a8315f50e51c6f0000000000288130000000000001976a914aba14c63f25fe9f63ab977f13008d06b670ed63088aca7120000000000001976a914fd0a4fb5039a65e6063a7c45ba22f25ab8e0677988ac00000000