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$$anon$3@29f2da17[Running, parallelism = 2, size = 2, active = 0, running = 0, steals = 33, tasks = 0, submissions = 0]
+// ec: ExecutionContext = scala.concurrent.impl.ExecutionContextImpl$$anon$3@2de823c8[Running, parallelism = 2, size = 2, active = 0, running = 0, steals = 35, 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(03ce0fd681835209bfd1ad3dde67d9b762cfc903ac767bf5c19dfd035a469189b4)
+// pubKey: ECPublicKey = ECPublicKey(0361010558e10960e9edd297dd996a0365db6d75b4396110f00cea426e886789da)
// 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(0bd96479c1c4902e74a82bd3b05a21ec3a877050)
+// creditingSpk: P2PKHScriptPubKey = pkh(ec276d7b0930d9d9548c07536831c5406b0465db)
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(0bd96479c1c4902e74a82bd3b05a21ec3a877050))
+// utxo: TransactionOutput = TransactionOutput(10000 sats,pkh(ec276d7b0930d9d9548c07536831c5406b0465db))
// 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(03edc040e2bde461709252ae75f7f8c7fd86e5fd)
+// destinationSPK: P2PKHScriptPubKey = pkh(a4f0d491b26ccd1674c74086736123c3375ba9db)
// 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(03edc040e2bde461709252ae75f7f8c7fd86e5fd)))
+// destinations: Vector[TransactionOutput] = Vector(TransactionOutput(5000 sats,pkh(a4f0d491b26ccd1674c74086736123c3375ba9db)))
// 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(0bd96479c1c4902e74a82bd3b05a21ec3a877050))),UInt32Impl(0))
+// creditingTx: BaseTransaction = BaseTransaction(Int32Impl(1),Vector(),Vector(TransactionOutput(10000 sats,pkh(ec276d7b0930d9d9548c07536831c5406b0465db))),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(8b24b113e005413b5cb494241bd6a46ca6b5a6fe0aeeda48fb066fd676a83844:0)
+// outPoint: TransactionOutPoint = TransactionOutPoint(7f23bbad70fcf2762148b4c068d9a25c468d8e86c52c16b3394b86d37eb1512a:0)
val input = TransactionInput(
outPoint,
EmptyScriptSignature,
sequenceNumber = UInt32.zero)
-// input: TransactionInput = TransactionInputImpl(TransactionOutPoint(8b24b113e005413b5cb494241bd6a46ca6b5a6fe0aeeda48fb066fd676a83844:0),EmptyScriptSignature,UInt32Impl(0))
+// input: TransactionInput = TransactionInputImpl(TransactionOutPoint(7f23bbad70fcf2762148b4c068d9a25c468d8e86c52c16b3394b86d37eb1512a: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(8b24b113e005413b5cb494241bd6a46ca6b5a6fe0aeeda48fb066fd676a83844:0),EmptyScriptSignature,UInt32Impl(0))),Vector(TransactionOutput(5000 sats,pkh(03edc040e2bde461709252ae75f7f8c7fd86e5fd))),UInt32Impl(0))
+// builderResult: RawTxBuilderResult = RawTxBuilderResult(Int32Impl(2),Vector(TransactionInputImpl(TransactionOutPoint(7f23bbad70fcf2762148b4c068d9a25c468d8e86c52c16b3394b86d37eb1512a:0),EmptyScriptSignature,UInt32Impl(0))),Vector(TransactionOutput(5000 sats,pkh(a4f0d491b26ccd1674c74086736123c3375ba9db))),UInt32Impl(0))
// this contains the information needed to analyze our input during finalization
val inputInfo = P2PKHInputInfo(outPoint, amount, privKey.publicKey)
-// inputInfo: P2PKHInputInfo = P2PKHInputInfo(TransactionOutPoint(8b24b113e005413b5cb494241bd6a46ca6b5a6fe0aeeda48fb066fd676a83844:0),10000 sats,ECPublicKey(03ce0fd681835209bfd1ad3dde67d9b762cfc903ac767bf5c19dfd035a469189b4))
+// inputInfo: P2PKHInputInfo = P2PKHInputInfo(TransactionOutPoint(7f23bbad70fcf2762148b4c068d9a25c468d8e86c52c16b3394b86d37eb1512a:0),10000 sats,ECPublicKey(0361010558e10960e9edd297dd996a0365db6d75b4396110f00cea426e886789da))
// 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(3817345c6b0021b82ab4e30be028a2943ef5df2a)
+// changeSPK: P2PKHScriptPubKey = pkh(6ad20f0c0987de4ff4e16275dd53bcbcadf72c90)
// 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(8b24b113e005413b5cb494241bd6a46ca6b5a6fe0aeeda48fb066fd676a83844:0),10000 sats,ECPublicKey(03ce0fd681835209bfd1ad3dde67d9b762cfc903ac767bf5c19dfd035a469189b4))),1 sats/byte,pkh(3817345c6b0021b82ab4e30be028a2943ef5df2a))
+// finalizer: StandardNonInteractiveFinalizer = StandardNonInteractiveFinalizer(Vector(P2PKHInputInfo(TransactionOutPoint(7f23bbad70fcf2762148b4c068d9a25c468d8e86c52c16b3394b86d37eb1512a:0),10000 sats,ECPublicKey(0361010558e10960e9edd297dd996a0365db6d75b4396110f00cea426e886789da))),1 sats/byte,pkh(6ad20f0c0987de4ff4e16275dd53bcbcadf72c90))
// 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(8b24b113e005413b5cb494241bd6a46ca6b5a6fe0aeeda48fb066fd676a83844:0),EmptyScriptSignature,UInt32Impl(0))),Vector(TransactionOutput(5000 sats,pkh(03edc040e2bde461709252ae75f7f8c7fd86e5fd)), TransactionOutput(4775 sats,pkh(3817345c6b0021b82ab4e30be028a2943ef5df2a))),UInt32Impl(0))))
+// unsignedTxF: Future[Transaction] = Future(Success(BaseTransaction(Int32Impl(2),Vector(TransactionInputImpl(TransactionOutPoint(7f23bbad70fcf2762148b4c068d9a25c468d8e86c52c16b3394b86d37eb1512a:0),EmptyScriptSignature,UInt32Impl(0))),Vector(TransactionOutput(5000 sats,pkh(a4f0d491b26ccd1674c74086736123c3375ba9db)), TransactionOutput(4775 sats,pkh(6ad20f0c0987de4ff4e16275dd53bcbcadf72c90))),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(8b24b113e005413b5cb494241bd6a46ca6b5a6fe0aeeda48fb066fd676a83844:0),10000 sats,ECPublicKey(03ce0fd681835209bfd1ad3dde67d9b762cfc903ac767bf5c19dfd035a469189b4)),BaseTransaction(Int32Impl(1),Vector(),Vector(TransactionOutput(10000 sats,pkh(0bd96479c1c4902e74a82bd3b05a21ec3a877050))),UInt32Impl(0)),Vector(Masked(ECPrivateKeyImpl)),SIGHASH_ALL(Int32Impl(1)))
+// utxoInfo: ScriptSignatureParams[P2PKHInputInfo] = ScriptSignatureParams(P2PKHInputInfo(TransactionOutPoint(7f23bbad70fcf2762148b4c068d9a25c468d8e86c52c16b3394b86d37eb1512a:0),10000 sats,ECPublicKey(0361010558e10960e9edd297dd996a0365db6d75b4396110f00cea426e886789da)),BaseTransaction(Int32Impl(1),Vector(),Vector(TransactionOutput(10000 sats,pkh(ec276d7b0930d9d9548c07536831c5406b0465db))),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(8b24b113e005413b5cb494241bd6a46ca6b5a6fe0aeeda48fb066fd676a83844:0),10000 sats,ECPublicKey(03ce0fd681835209bfd1ad3dde67d9b762cfc903ac767bf5c19dfd035a469189b4)),BaseTransaction(Int32Impl(1),Vector(),Vector(TransactionOutput(10000 sats,pkh(0bd96479c1c4902e74a82bd3b05a21ec3a877050))),UInt32Impl(0)),Vector(Masked(ECPrivateKeyImpl)),SIGHASH_ALL(Int32Impl(1))))
+// utxoInfos: Vector[ScriptSignatureParams[InputInfo]] = Vector(ScriptSignatureParams(P2PKHInputInfo(TransactionOutPoint(7f23bbad70fcf2762148b4c068d9a25c468d8e86c52c16b3394b86d37eb1512a:0),10000 sats,ECPublicKey(0361010558e10960e9edd297dd996a0365db6d75b4396110f00cea426e886789da)),BaseTransaction(Int32Impl(1),Vector(),Vector(TransactionOutput(10000 sats,pkh(ec276d7b0930d9d9548c07536831c5406b0465db))),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(8b24b113e005413b5cb494241bd6a46ca6b5a6fe0aeeda48fb066fd676a83844:0),P2PKHScriptSignature(ECPublicKey(03ce0fd681835209bfd1ad3dde67d9b762cfc903ac767bf5c19dfd035a469189b4), ECDigitalSignature(30440220553a51d3e7a032ee39b8498f01100c0e37f59e81620618b80432975f9fc7b516022006bf70970b7b47d8c7cc1150c4d7d65d06c1edf1d1450489c7c20f1dfba82ef901)),UInt32Impl(0))),Vector(TransactionOutput(5000 sats,pkh(03edc040e2bde461709252ae75f7f8c7fd86e5fd)), TransactionOutput(4775 sats,pkh(3817345c6b0021b82ab4e30be028a2943ef5df2a))),UInt32Impl(0))
+// signedTx: Transaction = BaseTransaction(Int32Impl(2),Vector(TransactionInputImpl(TransactionOutPoint(7f23bbad70fcf2762148b4c068d9a25c468d8e86c52c16b3394b86d37eb1512a:0),P2PKHScriptSignature(ECPublicKey(0361010558e10960e9edd297dd996a0365db6d75b4396110f00cea426e886789da), ECDigitalSignature(304402207eef7d232037eff7381339034f16e53e87a8a800f2bc1073e2687dcadf1e7abe0220047d8292122da028777d7ceb66070cba0f2a987943c58145890cd639d726b86401)),UInt32Impl(0))),Vector(TransactionOutput(5000 sats,pkh(a4f0d491b26ccd1674c74086736123c3375ba9db)), TransactionOutput(4775 sats,pkh(6ad20f0c0987de4ff4e16275dd53bcbcadf72c90))),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 = 02000000014438a876d66f06fb48daee0afea6b5a66ca4d61b2494b45c3b4105e013b1248b000000006a4730440220553a51d3e7a032ee39b8498f01100c0e37f59e81620618b80432975f9fc7b516022006bf70970b7b47d8c7cc1150c4d7d65d06c1edf1d1450489c7c20f1dfba82ef9012103ce0fd681835209bfd1ad3dde67d9b762cfc903ac767bf5c19dfd035a469189b4000000000288130000000000001976a91403edc040e2bde461709252ae75f7f8c7fd86e5fd88aca7120000000000001976a9143817345c6b0021b82ab4e30be028a2943ef5df2a88ac00000000
+// res4: String = 02000000012a51b17ed3864b39b3162cc5868e8d465ca2d968c0b4482176f2fc70adbb237f000000006a47304402207eef7d232037eff7381339034f16e53e87a8a800f2bc1073e2687dcadf1e7abe0220047d8292122da028777d7ceb66070cba0f2a987943c58145890cd639d726b86401210361010558e10960e9edd297dd996a0365db6d75b4396110f00cea426e886789da000000000288130000000000001976a914a4f0d491b26ccd1674c74086736123c3375ba9db88aca7120000000000001976a9146ad20f0c0987de4ff4e16275dd53bcbcadf72c9088ac00000000