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$$anon$3@645f27f3[Running, parallelism = 2, size = 2, active = 0, running = 0, steals = 35, tasks = 0, submissions = 0]
+// ec: ExecutionContext = scala.concurrent.impl.ExecutionContextImpl$$anon$3@52f653e0[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(0245054316b9724b46756c7bc9d8755e1a085a352ce410417769804e29bc40983b)
+// pubKey: ECPublicKey = ECPublicKey(0298d07bcef6c2b0290f91fcb1bc40e2d02efeca74a85a3c204a36ed411b673c2b)
// 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(1d2684d8d6d18e2f96661213e1b229740d0b888d)
+// creditingSpk: P2PKHScriptPubKey = pkh(33d66bf9aa87ed6575e5fce1c49da5e0bf7e6f5b)
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(1d2684d8d6d18e2f96661213e1b229740d0b888d))
+// utxo: TransactionOutput = TransactionOutput(10000 sats,pkh(33d66bf9aa87ed6575e5fce1c49da5e0bf7e6f5b))
// 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(4d1b99c958992197a14e405fe8b6c29287b1617f)
+// destinationSPK: P2PKHScriptPubKey = pkh(557366f1ba7c21eda4d9b4af928ed57398c9acee)
// 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(4d1b99c958992197a14e405fe8b6c29287b1617f)))
+// destinations: Vector[TransactionOutput] = Vector(TransactionOutput(5000 sats,pkh(557366f1ba7c21eda4d9b4af928ed57398c9acee)))
// 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(1d2684d8d6d18e2f96661213e1b229740d0b888d))),UInt32Impl(0))
+// creditingTx: BaseTransaction = BaseTransaction(Int32Impl(1),Vector(),Vector(TransactionOutput(10000 sats,pkh(33d66bf9aa87ed6575e5fce1c49da5e0bf7e6f5b))),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(afc46f070ece8fbbbbcd3e3dd8bced103e1b420c717f05aaa14a36a37c45b17a:0)
+// outPoint: TransactionOutPoint = TransactionOutPoint(e96cd1ccb41a8f8a01d2457fcaa6b51ee1ab6bc3e29356f444ade3fbcf59d0e0:0)
val input = TransactionInput(
outPoint,
EmptyScriptSignature,
sequenceNumber = UInt32.zero)
-// input: TransactionInput = TransactionInputImpl(TransactionOutPoint(afc46f070ece8fbbbbcd3e3dd8bced103e1b420c717f05aaa14a36a37c45b17a:0),EmptyScriptSignature,UInt32Impl(0))
+// input: TransactionInput = TransactionInputImpl(TransactionOutPoint(e96cd1ccb41a8f8a01d2457fcaa6b51ee1ab6bc3e29356f444ade3fbcf59d0e0:0),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(afc46f070ece8fbbbbcd3e3dd8bced103e1b420c717f05aaa14a36a37c45b17a:0),EmptyScriptSignature,UInt32Impl(0))),Vector(TransactionOutput(5000 sats,pkh(4d1b99c958992197a14e405fe8b6c29287b1617f))),UInt32Impl(0))
+// builderResult: RawTxBuilderResult = RawTxBuilderResult(Int32Impl(2),Vector(TransactionInputImpl(TransactionOutPoint(e96cd1ccb41a8f8a01d2457fcaa6b51ee1ab6bc3e29356f444ade3fbcf59d0e0:0),EmptyScriptSignature,UInt32Impl(0))),Vector(TransactionOutput(5000 sats,pkh(557366f1ba7c21eda4d9b4af928ed57398c9acee))),UInt32Impl(0))
// this contains the information needed to analyze our input during finalization
val inputInfo = P2PKHInputInfo(outPoint, amount, privKey.publicKey)
-// inputInfo: P2PKHInputInfo = P2PKHInputInfo(TransactionOutPoint(afc46f070ece8fbbbbcd3e3dd8bced103e1b420c717f05aaa14a36a37c45b17a:0),10000 sats,ECPublicKey(0245054316b9724b46756c7bc9d8755e1a085a352ce410417769804e29bc40983b))
+// inputInfo: P2PKHInputInfo = P2PKHInputInfo(TransactionOutPoint(e96cd1ccb41a8f8a01d2457fcaa6b51ee1ab6bc3e29356f444ade3fbcf59d0e0:0),10000 sats,ECPublicKey(0298d07bcef6c2b0290f91fcb1bc40e2d02efeca74a85a3c204a36ed411b673c2b))
// 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(d1c7db739ab9533fe5acba627e637410aec665cf)
+// changeSPK: P2PKHScriptPubKey = pkh(02a38dbaf7576ab269cf9aa15f0bed8e37b86898)
// 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(afc46f070ece8fbbbbcd3e3dd8bced103e1b420c717f05aaa14a36a37c45b17a:0),10000 sats,ECPublicKey(0245054316b9724b46756c7bc9d8755e1a085a352ce410417769804e29bc40983b))),1 sats/byte,pkh(d1c7db739ab9533fe5acba627e637410aec665cf))
+// finalizer: StandardNonInteractiveFinalizer = StandardNonInteractiveFinalizer(Vector(P2PKHInputInfo(TransactionOutPoint(e96cd1ccb41a8f8a01d2457fcaa6b51ee1ab6bc3e29356f444ade3fbcf59d0e0:0),10000 sats,ECPublicKey(0298d07bcef6c2b0290f91fcb1bc40e2d02efeca74a85a3c204a36ed411b673c2b))),1 sats/byte,pkh(02a38dbaf7576ab269cf9aa15f0bed8e37b86898))
// 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(afc46f070ece8fbbbbcd3e3dd8bced103e1b420c717f05aaa14a36a37c45b17a:0),EmptyScriptSignature,UInt32Impl(0))),Vector(TransactionOutput(5000 sats,pkh(4d1b99c958992197a14e405fe8b6c29287b1617f)), TransactionOutput(4775 sats,pkh(d1c7db739ab9533fe5acba627e637410aec665cf))),UInt32Impl(0))))
+// unsignedTxF: Future[Transaction] = Future(Success(BaseTransaction(Int32Impl(2),Vector(TransactionInputImpl(TransactionOutPoint(e96cd1ccb41a8f8a01d2457fcaa6b51ee1ab6bc3e29356f444ade3fbcf59d0e0:0),EmptyScriptSignature,UInt32Impl(0))),Vector(TransactionOutput(5000 sats,pkh(557366f1ba7c21eda4d9b4af928ed57398c9acee)), TransactionOutput(4775 sats,pkh(02a38dbaf7576ab269cf9aa15f0bed8e37b86898))),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(afc46f070ece8fbbbbcd3e3dd8bced103e1b420c717f05aaa14a36a37c45b17a:0),10000 sats,ECPublicKey(0245054316b9724b46756c7bc9d8755e1a085a352ce410417769804e29bc40983b)),BaseTransaction(Int32Impl(1),Vector(),Vector(TransactionOutput(10000 sats,pkh(1d2684d8d6d18e2f96661213e1b229740d0b888d))),UInt32Impl(0)),Vector(Masked(ECPrivateKeyImpl)),SIGHASH_ALL(Int32Impl(1)))
+// utxoInfo: ScriptSignatureParams[P2PKHInputInfo] = ScriptSignatureParams(P2PKHInputInfo(TransactionOutPoint(e96cd1ccb41a8f8a01d2457fcaa6b51ee1ab6bc3e29356f444ade3fbcf59d0e0:0),10000 sats,ECPublicKey(0298d07bcef6c2b0290f91fcb1bc40e2d02efeca74a85a3c204a36ed411b673c2b)),BaseTransaction(Int32Impl(1),Vector(),Vector(TransactionOutput(10000 sats,pkh(33d66bf9aa87ed6575e5fce1c49da5e0bf7e6f5b))),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(afc46f070ece8fbbbbcd3e3dd8bced103e1b420c717f05aaa14a36a37c45b17a:0),10000 sats,ECPublicKey(0245054316b9724b46756c7bc9d8755e1a085a352ce410417769804e29bc40983b)),BaseTransaction(Int32Impl(1),Vector(),Vector(TransactionOutput(10000 sats,pkh(1d2684d8d6d18e2f96661213e1b229740d0b888d))),UInt32Impl(0)),Vector(Masked(ECPrivateKeyImpl)),SIGHASH_ALL(Int32Impl(1))))
+// utxoInfos: Vector[ScriptSignatureParams[InputInfo]] = Vector(ScriptSignatureParams(P2PKHInputInfo(TransactionOutPoint(e96cd1ccb41a8f8a01d2457fcaa6b51ee1ab6bc3e29356f444ade3fbcf59d0e0:0),10000 sats,ECPublicKey(0298d07bcef6c2b0290f91fcb1bc40e2d02efeca74a85a3c204a36ed411b673c2b)),BaseTransaction(Int32Impl(1),Vector(),Vector(TransactionOutput(10000 sats,pkh(33d66bf9aa87ed6575e5fce1c49da5e0bf7e6f5b))),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(afc46f070ece8fbbbbcd3e3dd8bced103e1b420c717f05aaa14a36a37c45b17a:0),P2PKHScriptSignature(ECPublicKey(0245054316b9724b46756c7bc9d8755e1a085a352ce410417769804e29bc40983b), ECDigitalSignature(3044022077c5aab4d7db5f4348d5d56780cbd10e650ff59f3afa990fdc7e779b4e2979ec022055294848f50948ca48184700bcc987a24003ae8e6edb7864e0b51cbbdd1aaccd01)),UInt32Impl(0))),Vector(TransactionOutput(5000 sats,pkh(4d1b99c958992197a14e405fe8b6c29287b1617f)), TransactionOutput(4775 sats,pkh(d1c7db739ab9533fe5acba627e637410aec665cf))),UInt32Impl(0))
+// signedTx: Transaction = BaseTransaction(Int32Impl(2),Vector(TransactionInputImpl(TransactionOutPoint(e96cd1ccb41a8f8a01d2457fcaa6b51ee1ab6bc3e29356f444ade3fbcf59d0e0:0),P2PKHScriptSignature(ECPublicKey(0298d07bcef6c2b0290f91fcb1bc40e2d02efeca74a85a3c204a36ed411b673c2b), ECDigitalSignature(304402206dda57d1497a01573ae84f9c423908489a82a2c9859a7a38cfee8cb914a343ee02202bee352c04833679067a7f9a37b259aeb86b7be7d55fab513fd21fcc359885ec01)),UInt32Impl(0))),Vector(TransactionOutput(5000 sats,pkh(557366f1ba7c21eda4d9b4af928ed57398c9acee)), TransactionOutput(4775 sats,pkh(02a38dbaf7576ab269cf9aa15f0bed8e37b86898))),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 = 02000000017ab1457ca3364aa1aa057f710c421b3e10edbcd83d3ecdbbbb8fce0e076fc4af000000006a473044022077c5aab4d7db5f4348d5d56780cbd10e650ff59f3afa990fdc7e779b4e2979ec022055294848f50948ca48184700bcc987a24003ae8e6edb7864e0b51cbbdd1aaccd01210245054316b9724b46756c7bc9d8755e1a085a352ce410417769804e29bc40983b000000000288130000000000001976a9144d1b99c958992197a14e405fe8b6c29287b1617f88aca7120000000000001976a914d1c7db739ab9533fe5acba627e637410aec665cf88ac00000000
+// res4: String = 0200000001e0d059cffbe3ad44f45693e2c36babe11eb5a6ca7f45d2018a8f1ab4ccd16ce9000000006a47304402206dda57d1497a01573ae84f9c423908489a82a2c9859a7a38cfee8cb914a343ee02202bee352c04833679067a7f9a37b259aeb86b7be7d55fab513fd21fcc359885ec01210298d07bcef6c2b0290f91fcb1bc40e2d02efeca74a85a3c204a36ed411b673c2b000000000288130000000000001976a914557366f1ba7c21eda4d9b4af928ed57398c9acee88aca7120000000000001976a91402a38dbaf7576ab269cf9aa15f0bed8e37b8689888ac00000000