2020-04-02 12:36:04 +00:00
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2020-03-19 12:41:03 +00:00
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< / script > < / nav > < / div > < div class = "container mainContainer docsContainer" > < div class = "wrapper" > < div class = "post" > < header class = "postHeader" > < a class = "edit-page-link button" href = "https://github.com/bitcoin-s/bitcoin-s/blob/master/docs/core/psbts.md" target = "_blank" rel = "noreferrer noopener" > Edit< / a > < h1 id = "__docusaurus" class = "postHeaderTitle" > Partially Signed Bitcoin Transactions< / h1 > < / header > < article > < div > < span > < p > Creating unsigned or partially signed transactions to be passed
around to other signers can be a useful for many applications.
PSBTs offer a standardized format to serialize the necessary data
for signing the transaction, as well as, validating that you in fact
want to sign this transaction.< / p >
< blockquote >
< p > If you want to jump into the details of the specification,
you should checkout
< a href = "https://github.com/bitcoin/bips/blob/master/bip-0174.mediawiki" > BIP 174< / a > .< / p >
< / blockquote >
< p > Bitcoin-S fully supports PSBTs with functionality for
creation, updating, combining, signing, finalizing,
and transaction extraction.< / p >
< p > An example on a typical PSBT workflow:< / p >
< pre > < code class = "hljs css language-scala" > < span class = "hljs-keyword" > implicit< / span > < span class = "hljs-keyword" > val< / span > ec: < span class = "hljs-type" > ExecutionContextExecutor< / span > = < span class = "hljs-type" > ExecutionContext< / span > .global
< span class = "hljs-comment" > // First you need an unsigned transaction,< / span >
< span class = "hljs-comment" > // here we have a standard 2 input, 2 output transaction< / span >
< span class = "hljs-comment" > // This transaction must be of type BaseTransaction< / span >
< span class = "hljs-comment" > // and have empty ScriptSignatures for all of it's inputs< / span >
< span class = "hljs-keyword" > val< / span > unsignedTransaction = < span class = "hljs-type" > BaseTransaction< / span > (
< span class = "hljs-string" > "020000000258e87a21b56daf0c23be8e7070456c336f7cbaa5c8757924f545887bb2abdd750000000000ffffffff838d0427d0ec650a68aa46bb0b098aea4422c071b2ca78352a077959d07cea1d0100000000ffffffff0270aaf00800000000160014d85c2b71d0060b09c9886aeb815e50991dda124d00e1f5050000000016001400aea9a2e5f0f876a588df5546e8742d1d87008f00000000"< / span > )
< span class = "hljs-comment" > // To create the initial PSBT all we need to do is< / span >
< span class = "hljs-keyword" > val< / span > emptyPSBT = < span class = "hljs-type" > PSBT< / span > .fromUnsignedTx(unsignedTransaction)
< span class = "hljs-comment" > // Now that we have an empty PSBT we can start updating it with data we know< / span >
< span class = "hljs-comment" > // First, we want to fill the UTXO fields that we will need for signing and extraction< / span >
< span class = "hljs-comment" > // The transactions we add are the fully serialized transaction that we are spending from< / span >
< span class = "hljs-keyword" > val< / span > utxo0 = < span class = "hljs-type" > Transaction< / span > (
< span class = "hljs-string" > "0200000001aad73931018bd25f84ae400b68848be09db706eac2ac18298babee71ab656f8b0000000048473044022058f6fc7c6a33e1b31548d481c826c015bd30135aad42cd67790dab66d2ad243b02204a1ced2604c6735b6393e5b41691dd78b00f0c5942fb9f751856faa938157dba01feffffff0280f0fa020000000017a9140fb9463421696b82c833af241c78c17ddbde493487d0f20a270100000017a91429ca74f8a08f81999428185c97b5d852e4063f618765000000"< / span > )
< span class = "hljs-keyword" > val< / span > utxo1 = < span class = "hljs-type" > Transaction< / span > (
< span class = "hljs-string" > "0200000000010158e87a21b56daf0c23be8e7070456c336f7cbaa5c8757924f545887bb2abdd7501000000171600145f275f436b09a8cc9a2eb2a2f528485c68a56323feffffff02d8231f1b0100000017a914aed962d6654f9a2b36608eb9d64d2b260db4f1118700c2eb0b0000000017a914b7f5faf40e3d40a5a459b1db3535f2b72fa921e88702483045022100a22edcc6e5bc511af4cc4ae0de0fcd75c7e04d8c1c3a8aa9d820ed4b967384ec02200642963597b9b1bc22c75e9f3e117284a962188bf5e8a74c895089046a20ad770121035509a48eb623e10aace8bfd0212fdb8a8e5af3c94b0b133b95e114cab89e4f7965000000"< / span > )
< span class = "hljs-keyword" > val< / span > psbtWithUTXOs = emptyPSBT.addUTXOToInput(utxo0, index = < span class = "hljs-number" > 0< / span > ).addUTXOToInput(utxo1, index = < span class = "hljs-number" > 1< / span > )
< span class = "hljs-comment" > // After we have the relevant UTXOs we can add the< / span >
< span class = "hljs-comment" > // redeem scripts, witness scripts, and BIP 32 derivation paths if needed< / span >
< span class = "hljs-comment" > // In this transaction the first input is a P2SH 2-of-2 multisig< / span >
< span class = "hljs-comment" > // so we need to add its corresponding redeem script.< / span >
< span class = "hljs-comment" > // Here we are just using a deserialized version of the redeem script but< / span >
< span class = "hljs-comment" > // you may generate your ScriptPubKey another way in practice< / span >
< span class = "hljs-keyword" > val< / span > redeemScript0 = < span class = "hljs-type" > ScriptPubKey< / span > .fromAsmBytes(
< span class = "hljs-string" > hex"5221029583bf39ae0a609747ad199addd634fa6108559d6c5cd39b4c2183f1ab96e07f2102dab61ff49a14db6a7d02b0cd1fbb78fc4b18312b5b4e54dae4dba2fbfef536d752ae"< / span > )
< span class = "hljs-keyword" > val< / span > psbtWithUpdatedFirstInput =
psbtWithUTXOs.addRedeemOrWitnessScriptToInput(redeemScript0, index = < span class = "hljs-number" > 0< / span > )
< span class = "hljs-comment" > // The second input in this transaction is a P2SH(P2WSH) 2-of-2 multisig< / span >
< span class = "hljs-comment" > // so we need to add its corresponding redeem script and witness script.< / span >
< span class = "hljs-comment" > // Here we add them both using the same function, the PSBT updater will< / span >
< span class = "hljs-comment" > // be able to figure out, based on the available data, where to correctly< / span >
< span class = "hljs-keyword" > val< / span > redeemScript1 = < span class = "hljs-type" > ScriptPubKey< / span > .fromAsmBytes(
< span class = "hljs-string" > hex"00208c2353173743b595dfb4a07b72ba8e42e3797da74e87fe7d9d7497e3b2028903"< / span > )
< span class = "hljs-keyword" > val< / span > witnessScript = < span class = "hljs-type" > ScriptPubKey< / span > .fromAsmBytes(
< span class = "hljs-string" > hex"522103089dc10c7ac6db54f91329af617333db388cead0c231f723379d1b99030b02dc21023add904f3d6dcf59ddb906b0dee23529b7ffb9ed50e5e86151926860221f0e7352ae"< / span > )
< span class = "hljs-comment" > // put the data in the PSBT< / span >
< span class = "hljs-keyword" > val< / span > psbtWithUpdatedSecondInput = psbtWithUpdatedFirstInput
.addRedeemOrWitnessScriptToInput(redeemScript1, index = < span class = "hljs-number" > 1< / span > )
.addRedeemOrWitnessScriptToInput(witnessScript, index = < span class = "hljs-number" > 1< / span > )
< span class = "hljs-comment" > // Before signing we need to add the needed SigHash flags so we know how to sign the transaction< / span >
< span class = "hljs-comment" > // If one is not provided it will be assumed to be SigHashAll< / span >
< span class = "hljs-keyword" > val< / span > psbtWithSigHashFlags = psbtWithUpdatedSecondInput
.addSigHashTypeToInput(< span class = "hljs-type" > HashType< / span > .sigHashAll, index = < span class = "hljs-number" > 0< / span > )
.addSigHashTypeToInput(< span class = "hljs-type" > HashType< / span > .sigHashAll, index = < span class = "hljs-number" > 1< / span > )
< span class = "hljs-comment" > // Next, we can now sign the PSBT< / span >
< span class = "hljs-comment" > // Signing a PSBT will return a Future[PSBT] so this will need to be handled< / span >
< span class = "hljs-comment" > // correctly in an application< / span >
< span class = "hljs-comment" > // Here we use the relevant private keys to sign the first input< / span >
< span class = "hljs-keyword" > val< / span > privKey0 = < span class = "hljs-type" > ECPrivateKey< / span > .fromWIFToPrivateKey(
< span class = "hljs-string" > "cP53pDbR5WtAD8dYAW9hhTjuvvTVaEiQBdrz9XPrgLBeRFiyCbQr"< / span > )
< span class = "hljs-keyword" > val< / span > privKey1 = < span class = "hljs-type" > ECPrivateKey< / span > .fromWIFToPrivateKey(
< span class = "hljs-string" > "cR6SXDoyfQrcp4piaiHE97Rsgta9mNhGTen9XeonVgwsh4iSgw6d"< / span > )
< span class = "hljs-keyword" > val< / span > psbtFirstSigF =
psbtWithSigHashFlags
.sign(inputIndex = < span class = "hljs-number" > 0< / span > , signer = privKey0)
.flatMap(_.sign(inputIndex = < span class = "hljs-number" > 0< / span > , signer = privKey1))
< span class = "hljs-comment" > // Alternatively, you can use produce a signature with a BitcoinUTXOSpendingInfoSingle< / span >
< span class = "hljs-comment" > // using the BitcoinSingleSigner will return a PartialSignature that can be added to a PSBT< / span >
< span class = "hljs-comment" > // First we need to declare out spendingInfoSingle< / span >
< span class = "hljs-keyword" > val< / span > outPoint = unsignedTransaction.inputs.head.previousOutput
< span class = "hljs-keyword" > val< / span > output = utxo0.outputs(outPoint.vout.toInt)
< span class = "hljs-keyword" > val< / span > spendingInfoSingle = < span class = "hljs-type" > BitcoinUTXOSpendingInfoSingle< / span > (
outPoint = outPoint,
output = output,
signer = privKey0,
redeemScriptOpt = < span class = "hljs-type" > Some< / span > (redeemScript0),
scriptWitnessOpt = < span class = "hljs-type" > None< / span > ,
hashType = < span class = "hljs-type" > HashType< / span > .sigHashAll,
conditionalPath = < span class = "hljs-type" > ConditionalPath< / span > .< span class = "hljs-type" > NoConditionsLeft< / span >
)
< span class = "hljs-comment" > // Then we can sign the transaction< / span >
< span class = "hljs-keyword" > val< / span > signatureF = < span class = "hljs-type" > BitcoinSignerSingle< / span > .signSingle(
spendingInfo = spendingInfoSingle,
unsignedTx = unsignedTransaction,
isDummySignature = < span class = "hljs-literal" > false< / span > )
< span class = "hljs-comment" > // We can then add the signature to the PSBT< / span >
< span class = "hljs-comment" > // Note: this signature could be produced by us or another party< / span >
signatureF.map(sig => psbtWithSigHashFlags.addSignature(sig, inputIndex = < span class = "hljs-number" > 0< / span > ))
< span class = "hljs-comment" > // With our first input signed we can now move on to showing how another party could sign our second input< / span >
< span class = "hljs-keyword" > val< / span > signedTransactionF = psbtFirstSigF.map { psbtFirstSig =>
< span class = "hljs-comment" > // In this scenario, let's say that the second input does not belong to us and we need< / span >
< span class = "hljs-comment" > // another party to sign it. In this case we would need to send the PSBT to the other party.< / span >
< span class = "hljs-comment" > // The two standard formats for this are in byte form or in base64 you can access these easily.< / span >
< span class = "hljs-keyword" > val< / span > bytes = psbtFirstSig.bytes
< span class = "hljs-keyword" > val< / span > base64 = psbtFirstSig.base64
< span class = "hljs-comment" > // After the other party has signed their input they can send us back the PSBT with the signatures< / span >
< span class = "hljs-comment" > // To import we can use any of these functions< / span >
< span class = "hljs-keyword" > val< / span > fromBytes = < span class = "hljs-type" > PSBT< / span > .fromBytes(
< span class = "hljs-string" > hex"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"< / span > )
< span class = "hljs-keyword" > val< / span > fromBase64 = < span class = "hljs-type" > PSBT< / span > .fromBase64(
< span class = "hljs-string" > "cHNidP8BAJoCAAAAAljoeiG1ba8MI76OcHBFbDNvfLqlyHV5JPVFiHuyq911AAAAAAD"< / span > )
< span class = "hljs-comment" > // After we've imported the PSBT we can combine it with our own signed PSBT so we can< / span >
< span class = "hljs-comment" > // have one PSBT with all of the necessary data< / span >
< span class = "hljs-keyword" > val< / span > combinedPSBT = fromBase64.combinePSBT(psbtFirstSig)
< span class = "hljs-comment" > // Now that the PSBT has all the necessary data, we can finalize it and extract the transaction< / span >
< span class = "hljs-comment" > // This will return a Try[PSBT] and will fail if you do not have all the required fields filled< / span >
< span class = "hljs-keyword" > val< / span > finalizedPSBT = combinedPSBT.finalizePSBT
< span class = "hljs-comment" > // After it has been finalized we can extract the fully signed transaction that is ready< / span >
< span class = "hljs-comment" > // to be broadcast to the network.< / span >
< span class = "hljs-comment" > // You can also use extractTransactionAndValidate that will validate if the transaction is valid< / span >
finalizedPSBT.get.extractTransaction
}
< span class = "hljs-type" > Await< / span > .result(signedTransactionF, < span class = "hljs-number" > 30.< / span > seconds)
< / code > < / pre >
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