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$$anon$3@2e518bd4[Running, parallelism = 2, size = 2, active = 0, running = 0, steals = 33, tasks = 0, submissions = 0]
+// ec: ExecutionContext = scala.concurrent.impl.ExecutionContextImpl$$anon$3@52725840[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(025ae4ca14b820b56112bff3ef992efc34c8863489ae5e1dec37f908553a60ac05)
+// pubKey: ECPublicKey = ECPublicKey(02921575de93e97a6135f3b641992e46a51ce5ba31b57a631c61492ac562ecb192)
// 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(2a66e663c360b0f36e2a34b16ecbc320da7526b7)
+// creditingSpk: P2PKHScriptPubKey = pkh(54f62c563993f0f2ef68b5a7ba1c8bca967bb69c)
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(2a66e663c360b0f36e2a34b16ecbc320da7526b7))
+// utxo: TransactionOutput = TransactionOutput(10000 sats,pkh(54f62c563993f0f2ef68b5a7ba1c8bca967bb69c))
// 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(f63a7928648d99f2c7f7ec9770368502de4a202c)
+// destinationSPK: P2PKHScriptPubKey = pkh(2c97977a6d3bd26300936209ba44648470fbec62)
// 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(f63a7928648d99f2c7f7ec9770368502de4a202c)))
+// destinations: Vector[TransactionOutput] = Vector(TransactionOutput(5000 sats,pkh(2c97977a6d3bd26300936209ba44648470fbec62)))
// 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(2a66e663c360b0f36e2a34b16ecbc320da7526b7))),UInt32Impl(0))
+// creditingTx: BaseTransaction = BaseTransaction(Int32Impl(1),Vector(),Vector(TransactionOutput(10000 sats,pkh(54f62c563993f0f2ef68b5a7ba1c8bca967bb69c))),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(c9bd11a4ec3260ce25f457d7b4557267472cb8cba4bcdb678c975f98b57c9262:0)
+// outPoint: TransactionOutPoint = TransactionOutPoint(83ec97aa073ab1dfab9a3b99e2d0f6afd42b52d900c8c5662dcae5212332e784:0)
val input = TransactionInput(
outPoint,
EmptyScriptSignature,
sequenceNumber = UInt32.zero)
-// input: TransactionInput = TransactionInputImpl(TransactionOutPoint(c9bd11a4ec3260ce25f457d7b4557267472cb8cba4bcdb678c975f98b57c9262:0),EmptyScriptSignature,UInt32Impl(0))
+// input: TransactionInput = TransactionInputImpl(TransactionOutPoint(83ec97aa073ab1dfab9a3b99e2d0f6afd42b52d900c8c5662dcae5212332e784:0),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(c9bd11a4ec3260ce25f457d7b4557267472cb8cba4bcdb678c975f98b57c9262:0),EmptyScriptSignature,UInt32Impl(0))),Vector(TransactionOutput(5000 sats,pkh(f63a7928648d99f2c7f7ec9770368502de4a202c))),UInt32Impl(0))
+// builderResult: RawTxBuilderResult = RawTxBuilderResult(Int32Impl(2),Vector(TransactionInputImpl(TransactionOutPoint(83ec97aa073ab1dfab9a3b99e2d0f6afd42b52d900c8c5662dcae5212332e784:0),EmptyScriptSignature,UInt32Impl(0))),Vector(TransactionOutput(5000 sats,pkh(2c97977a6d3bd26300936209ba44648470fbec62))),UInt32Impl(0))
// this contains the information needed to analyze our input during finalization
val inputInfo = P2PKHInputInfo(outPoint, amount, privKey.publicKey)
-// inputInfo: P2PKHInputInfo = P2PKHInputInfo(TransactionOutPoint(c9bd11a4ec3260ce25f457d7b4557267472cb8cba4bcdb678c975f98b57c9262:0),10000 sats,ECPublicKey(025ae4ca14b820b56112bff3ef992efc34c8863489ae5e1dec37f908553a60ac05))
+// inputInfo: P2PKHInputInfo = P2PKHInputInfo(TransactionOutPoint(83ec97aa073ab1dfab9a3b99e2d0f6afd42b52d900c8c5662dcae5212332e784:0),10000 sats,ECPublicKey(02921575de93e97a6135f3b641992e46a51ce5ba31b57a631c61492ac562ecb192))
// 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(28be3d6dd0d46ef48303d8f72334dff1eb91abbd)
+// changeSPK: P2PKHScriptPubKey = pkh(56c16b59affe09b3b79aac2ea07709bc027a9a72)
// 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(c9bd11a4ec3260ce25f457d7b4557267472cb8cba4bcdb678c975f98b57c9262:0),10000 sats,ECPublicKey(025ae4ca14b820b56112bff3ef992efc34c8863489ae5e1dec37f908553a60ac05))),1 sats/byte,pkh(28be3d6dd0d46ef48303d8f72334dff1eb91abbd))
+// finalizer: StandardNonInteractiveFinalizer = StandardNonInteractiveFinalizer(Vector(P2PKHInputInfo(TransactionOutPoint(83ec97aa073ab1dfab9a3b99e2d0f6afd42b52d900c8c5662dcae5212332e784:0),10000 sats,ECPublicKey(02921575de93e97a6135f3b641992e46a51ce5ba31b57a631c61492ac562ecb192))),1 sats/byte,pkh(56c16b59affe09b3b79aac2ea07709bc027a9a72))
// 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(c9bd11a4ec3260ce25f457d7b4557267472cb8cba4bcdb678c975f98b57c9262:0),EmptyScriptSignature,UInt32Impl(0))),Vector(TransactionOutput(5000 sats,pkh(f63a7928648d99f2c7f7ec9770368502de4a202c)), TransactionOutput(4775 sats,pkh(28be3d6dd0d46ef48303d8f72334dff1eb91abbd))),UInt32Impl(0))))
+// unsignedTxF: Future[Transaction] = Future(Success(BaseTransaction(Int32Impl(2),Vector(TransactionInputImpl(TransactionOutPoint(83ec97aa073ab1dfab9a3b99e2d0f6afd42b52d900c8c5662dcae5212332e784:0),EmptyScriptSignature,UInt32Impl(0))),Vector(TransactionOutput(5000 sats,pkh(2c97977a6d3bd26300936209ba44648470fbec62)), TransactionOutput(4775 sats,pkh(56c16b59affe09b3b79aac2ea07709bc027a9a72))),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(c9bd11a4ec3260ce25f457d7b4557267472cb8cba4bcdb678c975f98b57c9262:0),10000 sats,ECPublicKey(025ae4ca14b820b56112bff3ef992efc34c8863489ae5e1dec37f908553a60ac05)),BaseTransaction(Int32Impl(1),Vector(),Vector(TransactionOutput(10000 sats,pkh(2a66e663c360b0f36e2a34b16ecbc320da7526b7))),UInt32Impl(0)),Vector(Masked(ECPrivateKeyImpl)),SIGHASH_ALL(Int32Impl(1)))
+// utxoInfo: ScriptSignatureParams[P2PKHInputInfo] = ScriptSignatureParams(P2PKHInputInfo(TransactionOutPoint(83ec97aa073ab1dfab9a3b99e2d0f6afd42b52d900c8c5662dcae5212332e784:0),10000 sats,ECPublicKey(02921575de93e97a6135f3b641992e46a51ce5ba31b57a631c61492ac562ecb192)),BaseTransaction(Int32Impl(1),Vector(),Vector(TransactionOutput(10000 sats,pkh(54f62c563993f0f2ef68b5a7ba1c8bca967bb69c))),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(c9bd11a4ec3260ce25f457d7b4557267472cb8cba4bcdb678c975f98b57c9262:0),10000 sats,ECPublicKey(025ae4ca14b820b56112bff3ef992efc34c8863489ae5e1dec37f908553a60ac05)),BaseTransaction(Int32Impl(1),Vector(),Vector(TransactionOutput(10000 sats,pkh(2a66e663c360b0f36e2a34b16ecbc320da7526b7))),UInt32Impl(0)),Vector(Masked(ECPrivateKeyImpl)),SIGHASH_ALL(Int32Impl(1))))
+// utxoInfos: Vector[ScriptSignatureParams[InputInfo]] = Vector(ScriptSignatureParams(P2PKHInputInfo(TransactionOutPoint(83ec97aa073ab1dfab9a3b99e2d0f6afd42b52d900c8c5662dcae5212332e784:0),10000 sats,ECPublicKey(02921575de93e97a6135f3b641992e46a51ce5ba31b57a631c61492ac562ecb192)),BaseTransaction(Int32Impl(1),Vector(),Vector(TransactionOutput(10000 sats,pkh(54f62c563993f0f2ef68b5a7ba1c8bca967bb69c))),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(c9bd11a4ec3260ce25f457d7b4557267472cb8cba4bcdb678c975f98b57c9262:0),P2PKHScriptSignature(ECPublicKey(025ae4ca14b820b56112bff3ef992efc34c8863489ae5e1dec37f908553a60ac05), ECDigitalSignature(3044022006fd40e10944d6bcda0b6000f87d95ce4d02ea29307d408d4223f3db684b62d0022061943efb97e25099b43187a7eaff73da49031b65326323a430be63c54cb09c5d01)),UInt32Impl(0))),Vector(TransactionOutput(5000 sats,pkh(f63a7928648d99f2c7f7ec9770368502de4a202c)), TransactionOutput(4775 sats,pkh(28be3d6dd0d46ef48303d8f72334dff1eb91abbd))),UInt32Impl(0))
+// signedTx: Transaction = BaseTransaction(Int32Impl(2),Vector(TransactionInputImpl(TransactionOutPoint(83ec97aa073ab1dfab9a3b99e2d0f6afd42b52d900c8c5662dcae5212332e784:0),P2PKHScriptSignature(ECPublicKey(02921575de93e97a6135f3b641992e46a51ce5ba31b57a631c61492ac562ecb192), ECDigitalSignature(304402207ff5351d331b8daa4d5a1630224bc338588da87e320307cab3dcdd4d2b26a9700220516b270444c641133084d6afba5a3f35767e6ccfa8a9cb4de4c8310992d5b8da01)),UInt32Impl(0))),Vector(TransactionOutput(5000 sats,pkh(2c97977a6d3bd26300936209ba44648470fbec62)), TransactionOutput(4775 sats,pkh(56c16b59affe09b3b79aac2ea07709bc027a9a72))),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 = 020000000162927cb5985f978c67dbbca4cbb82c47677255b4d757f425ce6032eca411bdc9000000006a473044022006fd40e10944d6bcda0b6000f87d95ce4d02ea29307d408d4223f3db684b62d0022061943efb97e25099b43187a7eaff73da49031b65326323a430be63c54cb09c5d0121025ae4ca14b820b56112bff3ef992efc34c8863489ae5e1dec37f908553a60ac05000000000288130000000000001976a914f63a7928648d99f2c7f7ec9770368502de4a202c88aca7120000000000001976a91428be3d6dd0d46ef48303d8f72334dff1eb91abbd88ac00000000
+// res4: String = 020000000184e7322321e5ca2d66c5c800d9522bd4aff6d0e2993b9aabdfb13a07aa97ec83000000006a47304402207ff5351d331b8daa4d5a1630224bc338588da87e320307cab3dcdd4d2b26a9700220516b270444c641133084d6afba5a3f35767e6ccfa8a9cb4de4c8310992d5b8da012102921575de93e97a6135f3b641992e46a51ce5ba31b57a631c61492ac562ecb192000000000288130000000000001976a9142c97977a6d3bd26300936209ba44648470fbec6288aca7120000000000001976a91456c16b59affe09b3b79aac2ea07709bc027a9a7288ac00000000