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$$anon$3@686ffec4[Running, parallelism = 2, size = 2, active = 0, running = 0, steals = 3, tasks = 0, submissions = 0]
+// ec: ExecutionContext = scala.concurrent.impl.ExecutionContextImpl$$anon$3@4fa8a537[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(03b846b1ded9755cdec752edb7746940945f11e92a59358b2e7a0abf844ec4cc4a)
+// pubKey: ECPublicKey = ECPublicKey(027b59bd05e80bb956a00073564edac55c7597f4d0e68392acc64385cd620f889b)
// 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(978d844e541451a3583ecb73f7572873cce8ce41)
+// creditingSpk: P2PKHScriptPubKey = pkh(1d93beb2e59ced5c7597a94c7807688db76ebd1f)
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(978d844e541451a3583ecb73f7572873cce8ce41))
+// utxo: TransactionOutput = TransactionOutput(10000 sats,pkh(1d93beb2e59ced5c7597a94c7807688db76ebd1f))
// 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(816dcf402974c905e65eec5df492ea5a3aeacf51)
+// destinationSPK: P2PKHScriptPubKey = pkh(0e2aa5010242230a1007c39c273b282e3c5380da)
// 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(816dcf402974c905e65eec5df492ea5a3aeacf51)))
+// destinations: Vector[TransactionOutput] = Vector(TransactionOutput(5000 sats,pkh(0e2aa5010242230a1007c39c273b282e3c5380da)))
// 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(978d844e541451a3583ecb73f7572873cce8ce41))),UInt32Impl(0))
+// creditingTx: BaseTransaction = BaseTransaction(Int32Impl(1),Vector(),Vector(TransactionOutput(10000 sats,pkh(1d93beb2e59ced5c7597a94c7807688db76ebd1f))),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(ce790c688a49b6630f9dc5a75282d237597d920c132b2577452f0d0b6c044226:0)
+// outPoint: TransactionOutPoint = TransactionOutPoint(b3dc2da24a406b1c7ded6ad06b20737a857fc9d8666aa97f93358819e5f56507:0)
val input = TransactionInput(
outPoint,
EmptyScriptSignature,
sequenceNumber = UInt32.zero)
-// input: TransactionInput = TransactionInputImpl(TransactionOutPoint(ce790c688a49b6630f9dc5a75282d237597d920c132b2577452f0d0b6c044226:0),EmptyScriptSignature,UInt32Impl(0))
+// input: TransactionInput = TransactionInputImpl(TransactionOutPoint(b3dc2da24a406b1c7ded6ad06b20737a857fc9d8666aa97f93358819e5f56507:0),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(ce790c688a49b6630f9dc5a75282d237597d920c132b2577452f0d0b6c044226:0),EmptyScriptSignature,UInt32Impl(0))),Vector(TransactionOutput(5000 sats,pkh(816dcf402974c905e65eec5df492ea5a3aeacf51))),UInt32Impl(0))
+// builderResult: RawTxBuilderResult = RawTxBuilderResult(Int32Impl(2),Vector(TransactionInputImpl(TransactionOutPoint(b3dc2da24a406b1c7ded6ad06b20737a857fc9d8666aa97f93358819e5f56507:0),EmptyScriptSignature,UInt32Impl(0))),Vector(TransactionOutput(5000 sats,pkh(0e2aa5010242230a1007c39c273b282e3c5380da))),UInt32Impl(0))
// this contains the information needed to analyze our input during finalization
val inputInfo = P2PKHInputInfo(outPoint, amount, privKey.publicKey)
-// inputInfo: P2PKHInputInfo = P2PKHInputInfo(TransactionOutPoint(ce790c688a49b6630f9dc5a75282d237597d920c132b2577452f0d0b6c044226:0),10000 sats,ECPublicKey(03b846b1ded9755cdec752edb7746940945f11e92a59358b2e7a0abf844ec4cc4a))
+// inputInfo: P2PKHInputInfo = P2PKHInputInfo(TransactionOutPoint(b3dc2da24a406b1c7ded6ad06b20737a857fc9d8666aa97f93358819e5f56507:0),10000 sats,ECPublicKey(027b59bd05e80bb956a00073564edac55c7597f4d0e68392acc64385cd620f889b))
// 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(c5a2f707903ffa2c379b2b945bc6c2ec3b404c86)
+// changeSPK: P2PKHScriptPubKey = pkh(094ea7e1b85b8955eae9b503d75e0b2b153661e3)
// 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(ce790c688a49b6630f9dc5a75282d237597d920c132b2577452f0d0b6c044226:0),10000 sats,ECPublicKey(03b846b1ded9755cdec752edb7746940945f11e92a59358b2e7a0abf844ec4cc4a))),SatoshisPerByte(1 sat),pkh(c5a2f707903ffa2c379b2b945bc6c2ec3b404c86))
+// finalizer: StandardNonInteractiveFinalizer = StandardNonInteractiveFinalizer(Vector(P2PKHInputInfo(TransactionOutPoint(b3dc2da24a406b1c7ded6ad06b20737a857fc9d8666aa97f93358819e5f56507:0),10000 sats,ECPublicKey(027b59bd05e80bb956a00073564edac55c7597f4d0e68392acc64385cd620f889b))),SatoshisPerByte(1 sat),pkh(094ea7e1b85b8955eae9b503d75e0b2b153661e3))
// 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(ce790c688a49b6630f9dc5a75282d237597d920c132b2577452f0d0b6c044226:0),EmptyScriptSignature,UInt32Impl(0))),Vector(TransactionOutput(5000 sats,pkh(816dcf402974c905e65eec5df492ea5a3aeacf51)), TransactionOutput(4775 sats,pkh(c5a2f707903ffa2c379b2b945bc6c2ec3b404c86))),UInt32Impl(0))))
+// unsignedTxF: Future[Transaction] = Future(Success(BaseTransaction(Int32Impl(2),Vector(TransactionInputImpl(TransactionOutPoint(b3dc2da24a406b1c7ded6ad06b20737a857fc9d8666aa97f93358819e5f56507:0),EmptyScriptSignature,UInt32Impl(0))),Vector(TransactionOutput(5000 sats,pkh(0e2aa5010242230a1007c39c273b282e3c5380da)), TransactionOutput(4775 sats,pkh(094ea7e1b85b8955eae9b503d75e0b2b153661e3))),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(ce790c688a49b6630f9dc5a75282d237597d920c132b2577452f0d0b6c044226:0),10000 sats,ECPublicKey(03b846b1ded9755cdec752edb7746940945f11e92a59358b2e7a0abf844ec4cc4a)),BaseTransaction(Int32Impl(1),Vector(),Vector(TransactionOutput(10000 sats,pkh(978d844e541451a3583ecb73f7572873cce8ce41))),UInt32Impl(0)),Vector(Masked(ECPrivateKeyImpl)),SIGHASH_ALL(Int32Impl(1)))
+// utxoInfo: ScriptSignatureParams[P2PKHInputInfo] = ScriptSignatureParams(P2PKHInputInfo(TransactionOutPoint(b3dc2da24a406b1c7ded6ad06b20737a857fc9d8666aa97f93358819e5f56507:0),10000 sats,ECPublicKey(027b59bd05e80bb956a00073564edac55c7597f4d0e68392acc64385cd620f889b)),BaseTransaction(Int32Impl(1),Vector(),Vector(TransactionOutput(10000 sats,pkh(1d93beb2e59ced5c7597a94c7807688db76ebd1f))),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(ce790c688a49b6630f9dc5a75282d237597d920c132b2577452f0d0b6c044226:0),10000 sats,ECPublicKey(03b846b1ded9755cdec752edb7746940945f11e92a59358b2e7a0abf844ec4cc4a)),BaseTransaction(Int32Impl(1),Vector(),Vector(TransactionOutput(10000 sats,pkh(978d844e541451a3583ecb73f7572873cce8ce41))),UInt32Impl(0)),Vector(Masked(ECPrivateKeyImpl)),SIGHASH_ALL(Int32Impl(1))))
+// utxoInfos: Vector[ScriptSignatureParams[InputInfo]] = Vector(ScriptSignatureParams(P2PKHInputInfo(TransactionOutPoint(b3dc2da24a406b1c7ded6ad06b20737a857fc9d8666aa97f93358819e5f56507:0),10000 sats,ECPublicKey(027b59bd05e80bb956a00073564edac55c7597f4d0e68392acc64385cd620f889b)),BaseTransaction(Int32Impl(1),Vector(),Vector(TransactionOutput(10000 sats,pkh(1d93beb2e59ced5c7597a94c7807688db76ebd1f))),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(ce790c688a49b6630f9dc5a75282d237597d920c132b2577452f0d0b6c044226:0),P2PKHScriptSignature(ECPublicKey(03b846b1ded9755cdec752edb7746940945f11e92a59358b2e7a0abf844ec4cc4a), ECDigitalSignature(3044022027a3ebf75435b53bf18ad9c3323278f92439853dbf7f359a0c9b6532a475645e02200199f717c5455a7f79b27f52aa7043d13e08ad5b8ae0960f1a8b889859cd289001)),UInt32Impl(0))),Vector(TransactionOutput(5000 sats,pkh(816dcf402974c905e65eec5df492ea5a3aeacf51)), TransactionOutput(4775 sats,pkh(c5a2f707903ffa2c379b2b945bc6c2ec3b404c86))),UInt32Impl(0))
+// signedTx: Transaction = BaseTransaction(Int32Impl(2),Vector(TransactionInputImpl(TransactionOutPoint(b3dc2da24a406b1c7ded6ad06b20737a857fc9d8666aa97f93358819e5f56507:0),P2PKHScriptSignature(ECPublicKey(027b59bd05e80bb956a00073564edac55c7597f4d0e68392acc64385cd620f889b), ECDigitalSignature(3044022047b0a71d19d3137e58ddb4baea6053d3d339a7e41ccd42a80a7af2d3ab328ee302200636e826dd086daf81a85f8301611ccdbd485b70659371b3fab2376438188abe01)),UInt32Impl(0))),Vector(TransactionOutput(5000 sats,pkh(0e2aa5010242230a1007c39c273b282e3c5380da)), TransactionOutput(4775 sats,pkh(094ea7e1b85b8955eae9b503d75e0b2b153661e3))),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 = 02000000012642046c0b0d2f4577252b130c927d5937d28252a7c59d0f63b6498a680c79ce000000006a473044022027a3ebf75435b53bf18ad9c3323278f92439853dbf7f359a0c9b6532a475645e02200199f717c5455a7f79b27f52aa7043d13e08ad5b8ae0960f1a8b889859cd2890012103b846b1ded9755cdec752edb7746940945f11e92a59358b2e7a0abf844ec4cc4a000000000288130000000000001976a914816dcf402974c905e65eec5df492ea5a3aeacf5188aca7120000000000001976a914c5a2f707903ffa2c379b2b945bc6c2ec3b404c8688ac00000000
+// res4: String = 02000000010765f5e5198835937fa96a66d8c97f857a73206bd06aed7d1c6b404aa22ddcb3000000006a473044022047b0a71d19d3137e58ddb4baea6053d3d339a7e41ccd42a80a7af2d3ab328ee302200636e826dd086daf81a85f8301611ccdbd485b70659371b3fab2376438188abe0121027b59bd05e80bb956a00073564edac55c7597f4d0e68392acc64385cd620f889b000000000288130000000000001976a9140e2aa5010242230a1007c39c273b282e3c5380da88aca7120000000000001976a914094ea7e1b85b8955eae9b503d75e0b2b153661e388ac00000000