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$$anon$3@44aaae45[Running, parallelism = 2, size = 2, active = 0, running = 0, steals = 3, tasks = 0, submissions = 0]
+// ec: ExecutionContext = scala.concurrent.impl.ExecutionContextImpl$$anon$3@5469c414[Running, parallelism = 2, size = 2, active = 0, running = 0, steals = 3, 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(02157ed44f9e4df8adec0f3323b9877bf7ab9fba765b505089cbadf9bee4b7ec27)
+// pubKey: ECPublicKey = ECPublicKey(02761d34890fde45f83e56324031e6561ef035178537460afa962808a9e77aa59d)
// 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(5b34cd54f9fe7cb27ffb8bfa580612bbf76350b5)
+// creditingSpk: P2PKHScriptPubKey = pkh(d8cc534724d4f3ff227b1f80ddf1bc03017d99fa)
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(5b34cd54f9fe7cb27ffb8bfa580612bbf76350b5))
+// utxo: TransactionOutput = TransactionOutput(10000 sats,pkh(d8cc534724d4f3ff227b1f80ddf1bc03017d99fa))
// 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(2e465e3ea9ec3fbc886ebdf8fa86acca1491afa5)
+// destinationSPK: P2PKHScriptPubKey = pkh(07fedf2a93c7f1c3b7532e1bf738925dbe33f491)
// 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(2e465e3ea9ec3fbc886ebdf8fa86acca1491afa5)))
+// destinations: Vector[TransactionOutput] = Vector(TransactionOutput(5000 sats,pkh(07fedf2a93c7f1c3b7532e1bf738925dbe33f491)))
// 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(5b34cd54f9fe7cb27ffb8bfa580612bbf76350b5))),UInt32Impl(0))
+// creditingTx: BaseTransaction = BaseTransaction(Int32Impl(1),Vector(),Vector(TransactionOutput(10000 sats,pkh(d8cc534724d4f3ff227b1f80ddf1bc03017d99fa))),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(8395558f7ed25cc2ead1c3bae0f8a490ed67d39c08ddd837db9f1df805d6e3a2:0)
+// outPoint: TransactionOutPoint = TransactionOutPoint(4cab62607f469dff73ef139e4a7aeb79fc5f37cebc7b7cb87258602c8a1ba20c:0)
val input = TransactionInput(
outPoint,
EmptyScriptSignature,
sequenceNumber = UInt32.zero)
-// input: TransactionInput = TransactionInputImpl(TransactionOutPoint(8395558f7ed25cc2ead1c3bae0f8a490ed67d39c08ddd837db9f1df805d6e3a2:0),EmptyScriptSignature,UInt32Impl(0))
+// input: TransactionInput = TransactionInputImpl(TransactionOutPoint(4cab62607f469dff73ef139e4a7aeb79fc5f37cebc7b7cb87258602c8a1ba20c: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(8395558f7ed25cc2ead1c3bae0f8a490ed67d39c08ddd837db9f1df805d6e3a2:0),EmptyScriptSignature,UInt32Impl(0))),Vector(TransactionOutput(5000 sats,pkh(2e465e3ea9ec3fbc886ebdf8fa86acca1491afa5))),UInt32Impl(0))
+// builderResult: RawTxBuilderResult = RawTxBuilderResult(Int32Impl(2),Vector(TransactionInputImpl(TransactionOutPoint(4cab62607f469dff73ef139e4a7aeb79fc5f37cebc7b7cb87258602c8a1ba20c:0),EmptyScriptSignature,UInt32Impl(0))),Vector(TransactionOutput(5000 sats,pkh(07fedf2a93c7f1c3b7532e1bf738925dbe33f491))),UInt32Impl(0))
// this contains the information needed to analyze our input during finalization
val inputInfo = P2PKHInputInfo(outPoint, amount, privKey.publicKey)
-// inputInfo: P2PKHInputInfo = P2PKHInputInfo(TransactionOutPoint(8395558f7ed25cc2ead1c3bae0f8a490ed67d39c08ddd837db9f1df805d6e3a2:0),10000 sats,ECPublicKey(02157ed44f9e4df8adec0f3323b9877bf7ab9fba765b505089cbadf9bee4b7ec27))
+// inputInfo: P2PKHInputInfo = P2PKHInputInfo(TransactionOutPoint(4cab62607f469dff73ef139e4a7aeb79fc5f37cebc7b7cb87258602c8a1ba20c:0),10000 sats,ECPublicKey(02761d34890fde45f83e56324031e6561ef035178537460afa962808a9e77aa59d))
// 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(3a5bce0937ad786191e822117e37d9d6b7d8547a)
+// changeSPK: P2PKHScriptPubKey = pkh(54e5194daeb8581874007c2e2c4536a15bb348e8)
// 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(8395558f7ed25cc2ead1c3bae0f8a490ed67d39c08ddd837db9f1df805d6e3a2:0),10000 sats,ECPublicKey(02157ed44f9e4df8adec0f3323b9877bf7ab9fba765b505089cbadf9bee4b7ec27))),1 sats/byte,pkh(3a5bce0937ad786191e822117e37d9d6b7d8547a))
+// finalizer: StandardNonInteractiveFinalizer = StandardNonInteractiveFinalizer(Vector(P2PKHInputInfo(TransactionOutPoint(4cab62607f469dff73ef139e4a7aeb79fc5f37cebc7b7cb87258602c8a1ba20c:0),10000 sats,ECPublicKey(02761d34890fde45f83e56324031e6561ef035178537460afa962808a9e77aa59d))),1 sats/byte,pkh(54e5194daeb8581874007c2e2c4536a15bb348e8))
// 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(8395558f7ed25cc2ead1c3bae0f8a490ed67d39c08ddd837db9f1df805d6e3a2:0),EmptyScriptSignature,UInt32Impl(0))),Vector(TransactionOutput(5000 sats,pkh(2e465e3ea9ec3fbc886ebdf8fa86acca1491afa5)), TransactionOutput(4775 sats,pkh(3a5bce0937ad786191e822117e37d9d6b7d8547a))),UInt32Impl(0))))
+// unsignedTxF: Future[Transaction] = Future(Success(BaseTransaction(Int32Impl(2),Vector(TransactionInputImpl(TransactionOutPoint(4cab62607f469dff73ef139e4a7aeb79fc5f37cebc7b7cb87258602c8a1ba20c:0),EmptyScriptSignature,UInt32Impl(0))),Vector(TransactionOutput(5000 sats,pkh(07fedf2a93c7f1c3b7532e1bf738925dbe33f491)), TransactionOutput(4775 sats,pkh(54e5194daeb8581874007c2e2c4536a15bb348e8))),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(8395558f7ed25cc2ead1c3bae0f8a490ed67d39c08ddd837db9f1df805d6e3a2:0),10000 sats,ECPublicKey(02157ed44f9e4df8adec0f3323b9877bf7ab9fba765b505089cbadf9bee4b7ec27)),BaseTransaction(Int32Impl(1),Vector(),Vector(TransactionOutput(10000 sats,pkh(5b34cd54f9fe7cb27ffb8bfa580612bbf76350b5))),UInt32Impl(0)),Vector(Masked(ECPrivateKeyImpl)),SIGHASH_ALL(Int32Impl(1)))
+// utxoInfo: ScriptSignatureParams[P2PKHInputInfo] = ScriptSignatureParams(P2PKHInputInfo(TransactionOutPoint(4cab62607f469dff73ef139e4a7aeb79fc5f37cebc7b7cb87258602c8a1ba20c:0),10000 sats,ECPublicKey(02761d34890fde45f83e56324031e6561ef035178537460afa962808a9e77aa59d)),BaseTransaction(Int32Impl(1),Vector(),Vector(TransactionOutput(10000 sats,pkh(d8cc534724d4f3ff227b1f80ddf1bc03017d99fa))),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(8395558f7ed25cc2ead1c3bae0f8a490ed67d39c08ddd837db9f1df805d6e3a2:0),10000 sats,ECPublicKey(02157ed44f9e4df8adec0f3323b9877bf7ab9fba765b505089cbadf9bee4b7ec27)),BaseTransaction(Int32Impl(1),Vector(),Vector(TransactionOutput(10000 sats,pkh(5b34cd54f9fe7cb27ffb8bfa580612bbf76350b5))),UInt32Impl(0)),Vector(Masked(ECPrivateKeyImpl)),SIGHASH_ALL(Int32Impl(1))))
+// utxoInfos: Vector[ScriptSignatureParams[InputInfo]] = Vector(ScriptSignatureParams(P2PKHInputInfo(TransactionOutPoint(4cab62607f469dff73ef139e4a7aeb79fc5f37cebc7b7cb87258602c8a1ba20c:0),10000 sats,ECPublicKey(02761d34890fde45f83e56324031e6561ef035178537460afa962808a9e77aa59d)),BaseTransaction(Int32Impl(1),Vector(),Vector(TransactionOutput(10000 sats,pkh(d8cc534724d4f3ff227b1f80ddf1bc03017d99fa))),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(8395558f7ed25cc2ead1c3bae0f8a490ed67d39c08ddd837db9f1df805d6e3a2:0),P2PKHScriptSignature(ECPublicKey(02157ed44f9e4df8adec0f3323b9877bf7ab9fba765b505089cbadf9bee4b7ec27), ECDigitalSignature(30440220702724cd2cf5ec5eac234aaeab8585bcc817fe2b64a0e7c955a3b53a411f81ee022025d64a8bb7d958d8209aa4493c7de1da95d4923b31b17d6ed0f35c08b2b884c901)),UInt32Impl(0))),Vector(TransactionOutput(5000 sats,pkh(2e465e3ea9ec3fbc886ebdf8fa86acca1491afa5)), TransactionOutput(4775 sats,pkh(3a5bce0937ad786191e822117e37d9d6b7d8547a))),UInt32Impl(0))
+// signedTx: Transaction = BaseTransaction(Int32Impl(2),Vector(TransactionInputImpl(TransactionOutPoint(4cab62607f469dff73ef139e4a7aeb79fc5f37cebc7b7cb87258602c8a1ba20c:0),P2PKHScriptSignature(ECPublicKey(02761d34890fde45f83e56324031e6561ef035178537460afa962808a9e77aa59d), ECDigitalSignature(304402206c4119556555f7508f293e6fa11dd36fb994f84e99f9c02c5ac192d539022fac02207b65e75bceb1e5096c64477fd6d7763fa415fc2849c09c430f359a5e23b7714b01)),UInt32Impl(0))),Vector(TransactionOutput(5000 sats,pkh(07fedf2a93c7f1c3b7532e1bf738925dbe33f491)), TransactionOutput(4775 sats,pkh(54e5194daeb8581874007c2e2c4536a15bb348e8))),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 = 0200000001a2e3d605f81d9fdb37d8dd089cd367ed90a4f8e0bac3d1eac25cd27e8f559583000000006a4730440220702724cd2cf5ec5eac234aaeab8585bcc817fe2b64a0e7c955a3b53a411f81ee022025d64a8bb7d958d8209aa4493c7de1da95d4923b31b17d6ed0f35c08b2b884c9012102157ed44f9e4df8adec0f3323b9877bf7ab9fba765b505089cbadf9bee4b7ec27000000000288130000000000001976a9142e465e3ea9ec3fbc886ebdf8fa86acca1491afa588aca7120000000000001976a9143a5bce0937ad786191e822117e37d9d6b7d8547a88ac00000000
+// res4: String = 02000000010ca21b8a2c605872b87c7bbcce375ffc79eb7a4a9e13ef73ff9d467f6062ab4c000000006a47304402206c4119556555f7508f293e6fa11dd36fb994f84e99f9c02c5ac192d539022fac02207b65e75bceb1e5096c64477fd6d7763fa415fc2849c09c430f359a5e23b7714b012102761d34890fde45f83e56324031e6561ef035178537460afa962808a9e77aa59d000000000288130000000000001976a91407fedf2a93c7f1c3b7532e1bf738925dbe33f49188aca7120000000000001976a91454e5194daeb8581874007c2e2c4536a15bb348e888ac00000000