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$$anon$3@50b1bcf6[Running, parallelism = 2, size = 2, active = 0, running = 0, steals = 33, tasks = 0, submissions = 0]
+// ec: ExecutionContext = scala.concurrent.impl.ExecutionContextImpl$$anon$3@389312a7[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(03d65032c40d502b4c8d79d1fb618f4cf0ccc595e05c45183551e9766c63e1469b)
+// pubKey: ECPublicKey = ECPublicKey(0368a4314e61d16436af74c3f4326b832be47760ef670ce8bcfb0e374724200abf)
// 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(37a7d3a84b9938051bb346712bc38683f1d30dfe)
+// creditingSpk: P2PKHScriptPubKey = pkh(382fa9618224779979328cf3b9207c92eab05cb9)
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(37a7d3a84b9938051bb346712bc38683f1d30dfe))
+// utxo: TransactionOutput = TransactionOutput(10000 sats,pkh(382fa9618224779979328cf3b9207c92eab05cb9))
// 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(6b8a6a107a3f6fcdba050274cc2b69395b99dad7)
+// destinationSPK: P2PKHScriptPubKey = pkh(7d18d2ea738ac70745cf742ca5cdbe5c062aaa1c)
// 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(6b8a6a107a3f6fcdba050274cc2b69395b99dad7)))
+// destinations: Vector[TransactionOutput] = Vector(TransactionOutput(5000 sats,pkh(7d18d2ea738ac70745cf742ca5cdbe5c062aaa1c)))
// 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(37a7d3a84b9938051bb346712bc38683f1d30dfe))),UInt32Impl(0))
+// creditingTx: BaseTransaction = BaseTransaction(Int32Impl(1),Vector(),Vector(TransactionOutput(10000 sats,pkh(382fa9618224779979328cf3b9207c92eab05cb9))),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(be0947693ba94f7891257d1eb432ea6433548efebd94f6341965f32afe0f6307:0)
+// outPoint: TransactionOutPoint = TransactionOutPoint(b32180600e1e5ca5d3022131d0ca179c3cafca3023cdd9214c1b8f59a012673f:0)
val input = TransactionInput(
outPoint,
EmptyScriptSignature,
sequenceNumber = UInt32.zero)
-// input: TransactionInput = TransactionInputImpl(TransactionOutPoint(be0947693ba94f7891257d1eb432ea6433548efebd94f6341965f32afe0f6307:0),EmptyScriptSignature,UInt32Impl(0))
+// input: TransactionInput = TransactionInputImpl(TransactionOutPoint(b32180600e1e5ca5d3022131d0ca179c3cafca3023cdd9214c1b8f59a012673f: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(be0947693ba94f7891257d1eb432ea6433548efebd94f6341965f32afe0f6307:0),EmptyScriptSignature,UInt32Impl(0))),Vector(TransactionOutput(5000 sats,pkh(6b8a6a107a3f6fcdba050274cc2b69395b99dad7))),UInt32Impl(0))
+// builderResult: RawTxBuilderResult = RawTxBuilderResult(Int32Impl(2),Vector(TransactionInputImpl(TransactionOutPoint(b32180600e1e5ca5d3022131d0ca179c3cafca3023cdd9214c1b8f59a012673f:0),EmptyScriptSignature,UInt32Impl(0))),Vector(TransactionOutput(5000 sats,pkh(7d18d2ea738ac70745cf742ca5cdbe5c062aaa1c))),UInt32Impl(0))
// this contains the information needed to analyze our input during finalization
val inputInfo = P2PKHInputInfo(outPoint, amount, privKey.publicKey)
-// inputInfo: P2PKHInputInfo = P2PKHInputInfo(TransactionOutPoint(be0947693ba94f7891257d1eb432ea6433548efebd94f6341965f32afe0f6307:0),10000 sats,ECPublicKey(03d65032c40d502b4c8d79d1fb618f4cf0ccc595e05c45183551e9766c63e1469b))
+// inputInfo: P2PKHInputInfo = P2PKHInputInfo(TransactionOutPoint(b32180600e1e5ca5d3022131d0ca179c3cafca3023cdd9214c1b8f59a012673f:0),10000 sats,ECPublicKey(0368a4314e61d16436af74c3f4326b832be47760ef670ce8bcfb0e374724200abf))
// 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(30059ff45079c238787c70fb9e825efaacbdbf91)
+// changeSPK: P2PKHScriptPubKey = pkh(a0f3380a3add10b157abb8ead8709eb6b9e4b3ba)
// 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(be0947693ba94f7891257d1eb432ea6433548efebd94f6341965f32afe0f6307:0),10000 sats,ECPublicKey(03d65032c40d502b4c8d79d1fb618f4cf0ccc595e05c45183551e9766c63e1469b))),1 sats/byte,pkh(30059ff45079c238787c70fb9e825efaacbdbf91))
+// finalizer: StandardNonInteractiveFinalizer = StandardNonInteractiveFinalizer(Vector(P2PKHInputInfo(TransactionOutPoint(b32180600e1e5ca5d3022131d0ca179c3cafca3023cdd9214c1b8f59a012673f:0),10000 sats,ECPublicKey(0368a4314e61d16436af74c3f4326b832be47760ef670ce8bcfb0e374724200abf))),1 sats/byte,pkh(a0f3380a3add10b157abb8ead8709eb6b9e4b3ba))
// 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(be0947693ba94f7891257d1eb432ea6433548efebd94f6341965f32afe0f6307:0),EmptyScriptSignature,UInt32Impl(0))),Vector(TransactionOutput(5000 sats,pkh(6b8a6a107a3f6fcdba050274cc2b69395b99dad7)), TransactionOutput(4775 sats,pkh(30059ff45079c238787c70fb9e825efaacbdbf91))),UInt32Impl(0))))
+// unsignedTxF: Future[Transaction] = Future(Success(BaseTransaction(Int32Impl(2),Vector(TransactionInputImpl(TransactionOutPoint(b32180600e1e5ca5d3022131d0ca179c3cafca3023cdd9214c1b8f59a012673f:0),EmptyScriptSignature,UInt32Impl(0))),Vector(TransactionOutput(5000 sats,pkh(7d18d2ea738ac70745cf742ca5cdbe5c062aaa1c)), TransactionOutput(4775 sats,pkh(a0f3380a3add10b157abb8ead8709eb6b9e4b3ba))),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(be0947693ba94f7891257d1eb432ea6433548efebd94f6341965f32afe0f6307:0),10000 sats,ECPublicKey(03d65032c40d502b4c8d79d1fb618f4cf0ccc595e05c45183551e9766c63e1469b)),BaseTransaction(Int32Impl(1),Vector(),Vector(TransactionOutput(10000 sats,pkh(37a7d3a84b9938051bb346712bc38683f1d30dfe))),UInt32Impl(0)),Vector(Masked(ECPrivateKeyImpl)),SIGHASH_ALL(Int32Impl(1)))
+// utxoInfo: ScriptSignatureParams[P2PKHInputInfo] = ScriptSignatureParams(P2PKHInputInfo(TransactionOutPoint(b32180600e1e5ca5d3022131d0ca179c3cafca3023cdd9214c1b8f59a012673f:0),10000 sats,ECPublicKey(0368a4314e61d16436af74c3f4326b832be47760ef670ce8bcfb0e374724200abf)),BaseTransaction(Int32Impl(1),Vector(),Vector(TransactionOutput(10000 sats,pkh(382fa9618224779979328cf3b9207c92eab05cb9))),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(be0947693ba94f7891257d1eb432ea6433548efebd94f6341965f32afe0f6307:0),10000 sats,ECPublicKey(03d65032c40d502b4c8d79d1fb618f4cf0ccc595e05c45183551e9766c63e1469b)),BaseTransaction(Int32Impl(1),Vector(),Vector(TransactionOutput(10000 sats,pkh(37a7d3a84b9938051bb346712bc38683f1d30dfe))),UInt32Impl(0)),Vector(Masked(ECPrivateKeyImpl)),SIGHASH_ALL(Int32Impl(1))))
+// utxoInfos: Vector[ScriptSignatureParams[InputInfo]] = Vector(ScriptSignatureParams(P2PKHInputInfo(TransactionOutPoint(b32180600e1e5ca5d3022131d0ca179c3cafca3023cdd9214c1b8f59a012673f:0),10000 sats,ECPublicKey(0368a4314e61d16436af74c3f4326b832be47760ef670ce8bcfb0e374724200abf)),BaseTransaction(Int32Impl(1),Vector(),Vector(TransactionOutput(10000 sats,pkh(382fa9618224779979328cf3b9207c92eab05cb9))),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(be0947693ba94f7891257d1eb432ea6433548efebd94f6341965f32afe0f6307:0),P2PKHScriptSignature(ECPublicKey(03d65032c40d502b4c8d79d1fb618f4cf0ccc595e05c45183551e9766c63e1469b), ECDigitalSignature(304402205d727ac145d4ec937158f76afa65fbe45d5b005947b6dcc0f1ff7f2bf7cb3659022030031c039357534869eaccb016c6796e794e8d25ef2daa42e85a4e9e5342496401)),UInt32Impl(0))),Vector(TransactionOutput(5000 sats,pkh(6b8a6a107a3f6fcdba050274cc2b69395b99dad7)), TransactionOutput(4775 sats,pkh(30059ff45079c238787c70fb9e825efaacbdbf91))),UInt32Impl(0))
+// signedTx: Transaction = BaseTransaction(Int32Impl(2),Vector(TransactionInputImpl(TransactionOutPoint(b32180600e1e5ca5d3022131d0ca179c3cafca3023cdd9214c1b8f59a012673f:0),P2PKHScriptSignature(ECPublicKey(0368a4314e61d16436af74c3f4326b832be47760ef670ce8bcfb0e374724200abf), ECDigitalSignature(3044022007c197006dba935bbf635020d3113dbc9acbb78deb56b345c081467903a5a800022027b7b6d09b54b18b424b39d43a82ee1aebaad2da0e8dc8e7989e6276b1f7e0b801)),UInt32Impl(0))),Vector(TransactionOutput(5000 sats,pkh(7d18d2ea738ac70745cf742ca5cdbe5c062aaa1c)), TransactionOutput(4775 sats,pkh(a0f3380a3add10b157abb8ead8709eb6b9e4b3ba))),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 = 020000000107630ffe2af3651934f694bdfe8e543364ea32b41e7d2591784fa93b694709be000000006a47304402205d727ac145d4ec937158f76afa65fbe45d5b005947b6dcc0f1ff7f2bf7cb3659022030031c039357534869eaccb016c6796e794e8d25ef2daa42e85a4e9e53424964012103d65032c40d502b4c8d79d1fb618f4cf0ccc595e05c45183551e9766c63e1469b000000000288130000000000001976a9146b8a6a107a3f6fcdba050274cc2b69395b99dad788aca7120000000000001976a91430059ff45079c238787c70fb9e825efaacbdbf9188ac00000000
+// res4: String = 02000000013f6712a0598f1b4c21d9cd2330caaf3c9c17cad0312102d3a55c1e0e608021b3000000006a473044022007c197006dba935bbf635020d3113dbc9acbb78deb56b345c081467903a5a800022027b7b6d09b54b18b424b39d43a82ee1aebaad2da0e8dc8e7989e6276b1f7e0b801210368a4314e61d16436af74c3f4326b832be47760ef670ce8bcfb0e374724200abf000000000288130000000000001976a9147d18d2ea738ac70745cf742ca5cdbe5c062aaa1c88aca7120000000000001976a914a0f3380a3add10b157abb8ead8709eb6b9e4b3ba88ac00000000