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$$anon$3@35378fe1[Running, parallelism = 2, size = 2, active = 0, running = 0, steals = 37, tasks = 0, submissions = 0]
+// ec: ExecutionContext = scala.concurrent.impl.ExecutionContextImpl$$anon$3@399c0f8b[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(02530ee3fd565e59f937e56bda48e9225ea8b09986e6987e6c89afa4930dae7326)
+// pubKey: ECPublicKey = ECPublicKey(022a992a3bf2b093045485ea8217c1912a636c4cfd50f4361b9b51e3c5a3799ffd)
// 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(76ee004f76fdda7861782f616b6b36d0c3425c71)
+// creditingSpk: P2PKHScriptPubKey = pkh(ec2c33f1b36ef6c7d660e125d05754718bf6f1a4)
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(76ee004f76fdda7861782f616b6b36d0c3425c71))
+// utxo: TransactionOutput = TransactionOutput(10000 sats,pkh(ec2c33f1b36ef6c7d660e125d05754718bf6f1a4))
// 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(492685e43f739cb5e4ba10fffca6ea92ba5bb501)
+// destinationSPK: P2PKHScriptPubKey = pkh(93daee134f71680ea95752cdb7efc19a8b70ba1f)
// 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(492685e43f739cb5e4ba10fffca6ea92ba5bb501)))
+// destinations: Vector[TransactionOutput] = Vector(TransactionOutput(5000 sats,pkh(93daee134f71680ea95752cdb7efc19a8b70ba1f)))
// 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(76ee004f76fdda7861782f616b6b36d0c3425c71))),UInt32Impl(0))
+// creditingTx: BaseTransaction = BaseTransaction(Int32Impl(1),Vector(),Vector(TransactionOutput(10000 sats,pkh(ec2c33f1b36ef6c7d660e125d05754718bf6f1a4))),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(f7ccf1e4d6e77bd17387c4e64ed79e17fbd7ffffccd06fdd7ef3c3e490b9d5ee:0)
+// outPoint: TransactionOutPoint = TransactionOutPoint(5e6d204bd5aa3fad3760c66b3cdc77b32fdcefb224a41fdcf5af9a7793abd4b8:0)
val input = TransactionInput(
outPoint,
EmptyScriptSignature,
sequenceNumber = UInt32.zero)
-// input: TransactionInput = TransactionInputImpl(TransactionOutPoint(f7ccf1e4d6e77bd17387c4e64ed79e17fbd7ffffccd06fdd7ef3c3e490b9d5ee:0),EmptyScriptSignature,UInt32Impl(0))
+// input: TransactionInput = TransactionInputImpl(TransactionOutPoint(5e6d204bd5aa3fad3760c66b3cdc77b32fdcefb224a41fdcf5af9a7793abd4b8:0),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(f7ccf1e4d6e77bd17387c4e64ed79e17fbd7ffffccd06fdd7ef3c3e490b9d5ee:0),EmptyScriptSignature,UInt32Impl(0))),Vector(TransactionOutput(5000 sats,pkh(492685e43f739cb5e4ba10fffca6ea92ba5bb501))),UInt32Impl(0))
+// builderResult: RawTxBuilderResult = RawTxBuilderResult(Int32Impl(2),Vector(TransactionInputImpl(TransactionOutPoint(5e6d204bd5aa3fad3760c66b3cdc77b32fdcefb224a41fdcf5af9a7793abd4b8:0),EmptyScriptSignature,UInt32Impl(0))),Vector(TransactionOutput(5000 sats,pkh(93daee134f71680ea95752cdb7efc19a8b70ba1f))),UInt32Impl(0))
// this contains the information needed to analyze our input during finalization
val inputInfo = P2PKHInputInfo(outPoint, amount, privKey.publicKey)
-// inputInfo: P2PKHInputInfo = P2PKHInputInfo(TransactionOutPoint(f7ccf1e4d6e77bd17387c4e64ed79e17fbd7ffffccd06fdd7ef3c3e490b9d5ee:0),10000 sats,ECPublicKey(02530ee3fd565e59f937e56bda48e9225ea8b09986e6987e6c89afa4930dae7326))
+// inputInfo: P2PKHInputInfo = P2PKHInputInfo(TransactionOutPoint(5e6d204bd5aa3fad3760c66b3cdc77b32fdcefb224a41fdcf5af9a7793abd4b8:0),10000 sats,ECPublicKey(022a992a3bf2b093045485ea8217c1912a636c4cfd50f4361b9b51e3c5a3799ffd))
// 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(e896cc908f35f392ede12450e96f886b1b963c08)
+// changeSPK: P2PKHScriptPubKey = pkh(b531643f691903cd6a8184ab4d3969cfd15a3651)
// 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(f7ccf1e4d6e77bd17387c4e64ed79e17fbd7ffffccd06fdd7ef3c3e490b9d5ee:0),10000 sats,ECPublicKey(02530ee3fd565e59f937e56bda48e9225ea8b09986e6987e6c89afa4930dae7326))),1 sats/byte,pkh(e896cc908f35f392ede12450e96f886b1b963c08))
+// finalizer: StandardNonInteractiveFinalizer = StandardNonInteractiveFinalizer(Vector(P2PKHInputInfo(TransactionOutPoint(5e6d204bd5aa3fad3760c66b3cdc77b32fdcefb224a41fdcf5af9a7793abd4b8:0),10000 sats,ECPublicKey(022a992a3bf2b093045485ea8217c1912a636c4cfd50f4361b9b51e3c5a3799ffd))),1 sats/byte,pkh(b531643f691903cd6a8184ab4d3969cfd15a3651))
// 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(f7ccf1e4d6e77bd17387c4e64ed79e17fbd7ffffccd06fdd7ef3c3e490b9d5ee:0),EmptyScriptSignature,UInt32Impl(0))),Vector(TransactionOutput(5000 sats,pkh(492685e43f739cb5e4ba10fffca6ea92ba5bb501)), TransactionOutput(4775 sats,pkh(e896cc908f35f392ede12450e96f886b1b963c08))),UInt32Impl(0))))
+// unsignedTxF: Future[Transaction] = Future(Success(BaseTransaction(Int32Impl(2),Vector(TransactionInputImpl(TransactionOutPoint(5e6d204bd5aa3fad3760c66b3cdc77b32fdcefb224a41fdcf5af9a7793abd4b8:0),EmptyScriptSignature,UInt32Impl(0))),Vector(TransactionOutput(5000 sats,pkh(93daee134f71680ea95752cdb7efc19a8b70ba1f)), TransactionOutput(4775 sats,pkh(b531643f691903cd6a8184ab4d3969cfd15a3651))),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(f7ccf1e4d6e77bd17387c4e64ed79e17fbd7ffffccd06fdd7ef3c3e490b9d5ee:0),10000 sats,ECPublicKey(02530ee3fd565e59f937e56bda48e9225ea8b09986e6987e6c89afa4930dae7326)),BaseTransaction(Int32Impl(1),Vector(),Vector(TransactionOutput(10000 sats,pkh(76ee004f76fdda7861782f616b6b36d0c3425c71))),UInt32Impl(0)),Vector(Masked(ECPrivateKeyImpl)),SIGHASH_ALL(Int32Impl(1)))
+// utxoInfo: ScriptSignatureParams[P2PKHInputInfo] = ScriptSignatureParams(P2PKHInputInfo(TransactionOutPoint(5e6d204bd5aa3fad3760c66b3cdc77b32fdcefb224a41fdcf5af9a7793abd4b8:0),10000 sats,ECPublicKey(022a992a3bf2b093045485ea8217c1912a636c4cfd50f4361b9b51e3c5a3799ffd)),BaseTransaction(Int32Impl(1),Vector(),Vector(TransactionOutput(10000 sats,pkh(ec2c33f1b36ef6c7d660e125d05754718bf6f1a4))),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(f7ccf1e4d6e77bd17387c4e64ed79e17fbd7ffffccd06fdd7ef3c3e490b9d5ee:0),10000 sats,ECPublicKey(02530ee3fd565e59f937e56bda48e9225ea8b09986e6987e6c89afa4930dae7326)),BaseTransaction(Int32Impl(1),Vector(),Vector(TransactionOutput(10000 sats,pkh(76ee004f76fdda7861782f616b6b36d0c3425c71))),UInt32Impl(0)),Vector(Masked(ECPrivateKeyImpl)),SIGHASH_ALL(Int32Impl(1))))
+// utxoInfos: Vector[ScriptSignatureParams[InputInfo]] = Vector(ScriptSignatureParams(P2PKHInputInfo(TransactionOutPoint(5e6d204bd5aa3fad3760c66b3cdc77b32fdcefb224a41fdcf5af9a7793abd4b8:0),10000 sats,ECPublicKey(022a992a3bf2b093045485ea8217c1912a636c4cfd50f4361b9b51e3c5a3799ffd)),BaseTransaction(Int32Impl(1),Vector(),Vector(TransactionOutput(10000 sats,pkh(ec2c33f1b36ef6c7d660e125d05754718bf6f1a4))),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(f7ccf1e4d6e77bd17387c4e64ed79e17fbd7ffffccd06fdd7ef3c3e490b9d5ee:0),P2PKHScriptSignature(ECPublicKey(02530ee3fd565e59f937e56bda48e9225ea8b09986e6987e6c89afa4930dae7326), ECDigitalSignature(304402205af538c9ab33dcf531c8acb49a6da8849390a6cf0b3d1ccd4a8cd8989062e18e02203dce90afcb95d6605cad4eb60c8026ac5884ccac66c27eeba420191feb112d3e01)),UInt32Impl(0))),Vector(TransactionOutput(5000 sats,pkh(492685e43f739cb5e4ba10fffca6ea92ba5bb501)), TransactionOutput(4775 sats,pkh(e896cc908f35f392ede12450e96f886b1b963c08))),UInt32Impl(0))
+// signedTx: Transaction = BaseTransaction(Int32Impl(2),Vector(TransactionInputImpl(TransactionOutPoint(5e6d204bd5aa3fad3760c66b3cdc77b32fdcefb224a41fdcf5af9a7793abd4b8:0),P2PKHScriptSignature(ECPublicKey(022a992a3bf2b093045485ea8217c1912a636c4cfd50f4361b9b51e3c5a3799ffd), ECDigitalSignature(3044022076f64ffd051890d4fc5f0f5c05bf0bd4dbdac51b0984539fb3a9d05d9b1e51d30220704b82d8f69d2e90da5db98898caed6261f80ac9eedb8369ef1ff269441a039601)),UInt32Impl(0))),Vector(TransactionOutput(5000 sats,pkh(93daee134f71680ea95752cdb7efc19a8b70ba1f)), TransactionOutput(4775 sats,pkh(b531643f691903cd6a8184ab4d3969cfd15a3651))),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 = 0200000001eed5b990e4c3f37edd6fd0ccffffd7fb179ed74ee6c48773d17be7d6e4f1ccf7000000006a47304402205af538c9ab33dcf531c8acb49a6da8849390a6cf0b3d1ccd4a8cd8989062e18e02203dce90afcb95d6605cad4eb60c8026ac5884ccac66c27eeba420191feb112d3e012102530ee3fd565e59f937e56bda48e9225ea8b09986e6987e6c89afa4930dae7326000000000288130000000000001976a914492685e43f739cb5e4ba10fffca6ea92ba5bb50188aca7120000000000001976a914e896cc908f35f392ede12450e96f886b1b963c0888ac00000000
+// res4: String = 0200000001b8d4ab93779aaff5dc1fa424b2efdc2fb377dc3c6bc66037ad3faad54b206d5e000000006a473044022076f64ffd051890d4fc5f0f5c05bf0bd4dbdac51b0984539fb3a9d05d9b1e51d30220704b82d8f69d2e90da5db98898caed6261f80ac9eedb8369ef1ff269441a03960121022a992a3bf2b093045485ea8217c1912a636c4cfd50f4361b9b51e3c5a3799ffd000000000288130000000000001976a91493daee134f71680ea95752cdb7efc19a8b70ba1f88aca7120000000000001976a914b531643f691903cd6a8184ab4d3969cfd15a365188ac00000000