Move Bitcoin OP_RETURN to 2nd Output Instead of Third

[ronaldoguedess]

Is it possible for me to move the OP_RETURN to the second output instead? In the linked transaction, it's currently in the last output, but I need to comply with a requirement that specifies it should be sent in the second output.

Wrong: This is how the below code is sending..

https://blockchair.com/bitcoin/testnet/transaction/5d79d7e8b7f1066248ba24a95f46f106cc7984442ad0179e7d8a5c7ff587f8d8

Right: This is how I need to send it... (OP_RETURN in the second output)

https://blockchair.com/bitcoin/testnet/transaction/603c2bd11b048002e00d3527cfa2349f79b5efe724f37a57442030fcdd86caa6

//BUILD TX
           val scriptUTXO = BitcoinScript.lockScriptForAddress(addressFrom, CoinType.BITCOIN)
           val scriptHash = scriptUTXO.matchPayToWitnessPublicKeyHash()
           val redeemScriptHash = scriptHash.toHexString()
           val redeemScript = BitcoinScript.lockScriptForAddress(addressFrom, CoinType.BITCOIN).data()

           //INPUT
           val input = Bitcoin.SigningInput.newBuilder().apply {
               this.amount = amount       //1962973
               if (maxAmount) {
                   this.useMaxAmount = true //auto-sweep
               }
               this.hashType = BitcoinSigHashType.ALL.value()
               this.toAddress = addressToTss //Receiver ADDRESS (TO) MUST BE TSS
               this.changeAddress = changeAddressLeftOver.ifEmpty { addressFrom } //LEFT OVER
               this.byteFee = byteFee.toLong()
               this.coinType = CoinType.BITCOIN.value()
               this.addPrivateKey(ByteString.copyFrom(hexPrivateKey.hexStringToByteArray()))  //HEX
           }
           input.putScripts(redeemScriptHash, ByteString.copyFrom(redeemScript))
           
             // OP_RETURN OUTPUT
           val opReturnData = "D6037B019c86c912963CBAe893Db3f8DB1a471B7025F0b1a82749cb4E2278EC87F8BF6B618dC71a8bffE26BF9Fe82e05d011f9B2B4Fc6fC9DB6F4d62E400".toHexBytes()
           input.outputOpReturn = ByteString.copyFrom(opReturnData)
           
           
           //UTXO
           for (buff in unspentUtxos.items) {
               val txHash = buff.txHash.toHexBytes()
               txHash.reverse()
               val outPoint = Bitcoin.OutPoint.newBuilder().apply {
                   this.hash = ByteString.copyFrom(txHash)
                   this.index = buff.txOutput
                   if (transferRbf){
                       this.sequence = 0 //RBF ENABLED
                   }else{
                       this.sequence = Long.MAX_VALUE.toInt() //RBF DISABLED
                   }
               }.build()
               val utxo = Bitcoin.UnspentTransaction.newBuilder().apply {
                   this.amount = buff.value.toBigDecimal().toLong()
                   this.outPoint = outPoint
                   this.script = ByteString.copyFrom(scriptUTXO.data())
               }.build()
               input.addUtxo(utxo);
           }

           //PLAN
           val plan = AnySigner.plan(input.build(), CoinType.BITCOIN, Bitcoin.TransactionPlan.parser())
           Log.e("xxxxxxxxxxxxx", "Planned fee:  ${plan.fee}  amount: ${plan.amount}  avail_amount: ${plan.availableAmount}  change: ${plan.change}")
           input.plan   = plan
           input.amount = plan.amount

           //SIGN TX
           val output = AnySigner.sign(input.build(), CoinType.BITCOIN, Bitcoin.SigningOutput.parser())
           val encoded = output.encoded
           val transactionSizeBytes = encoded.toByteArray().size
           
            val signedTransaction = Numeric.toHexString(encoded.toByteArray()).substring(2)
           assert(output.error == Common.SigningError.OK)

[satoshiotomakan]

Hi @ronaldoguedess, this is exactly the feature we recently added to WalletCore.
Consider using SigningInput::output_op_return_index

[satoshiotomakan]

So in your case, it should look like

input.outputOpReturnIndex = Bitcoin.OutputIndex.newBuilder().apply {
  this.index = 1
}

[ronaldoguedess]

Wow... That so good!! just when i needed. haha

But it won't works as it supposet to: (I'm usign the last wallet core 4.0.42)

[satoshiotomakan]

Should work with:

input.outputOpReturnIndex = Bitcoin.OutputIndex.newBuilder().apply {
  this.index = 1
}
  .build()

[Ruyeduardo]

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[Tpkilgore197]

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[Tpkilgore197]

Thank you Timothy P. KilgoreOn May 15, 2024, at 10:20, satoshiotomakan ***@***.***> wrote: Should work with: input.outputOpReturnIndex = Bitcoin.OutputIndex.newBuilder().apply { this.index = 1 } .build() —Reply to this email directly, view it on GitHub, or unsubscribe.You are receiving this because you are subscribed to this thread.Message ID: ***@***.***>