BIP322 signing

[gamedevod]

I want to make implementation of BIP322 signature logic as here
https://github.com/unisat-wallet/wallet-sdk/blob/8cac086d87daf85d654a0d15efe52d3f53508b73/src/message/bip322-simple.ts
, but I get wrong result, who knows, please advise and help me where I make a mistake.

func main() {
	      // Your parameters (adapt as necessary)
	      message := "Quantum Cats by Taproot Wizards\r\nSigning this message is only for authentication and will NOT authorize the spending of any existing funds."
	      messageHash := bip0322Hash(message)
      
	      address, err := btcutil.DecodeAddress("my address", &chaincfg.MainNetParams)
      
	      outputScript, _ := txscript.PayToAddrScript(address)
      
	      scriptSigPrefix := []byte{0x00, 0x20} // This corresponds to "0020" in hex
	      scriptSig := append(scriptSigPrefix, messageHash...)
	      println(scriptSig)
	      // Convert prevoutHash from hex
	      prevoutHash, err := chainhash.NewHashFromStr("0000000000000000000000000000000000000000000000000000000000000000")
	      if err != nil {
		      log.Fatal(err)
	      }
	      prevoutIndex := uint32(0xffffffff)
      
	      // Create a new transaction
	      txToSpend := wire.NewMsgTx(0)
	      // Add an input without a scriptSig, as PSBT requires unsigned inputs
	      txToSpend.AddTxIn(wire.NewTxIn(wire.NewOutPoint(prevoutHash, prevoutIndex), scriptSig, nil))
      
	      txToSpend.AddTxOut(wire.NewTxOut(0, outputScript))
      
	      // Create a new PSBT
	      psbtToSign, _, _, err := psbt.NewFromSignedTx(txToSpend)
	      if err != nil {
		      log.Fatal(err)
	      }
	      // Set data as part of the PSBT input, not as scriptSig
	      psbtToSign.Inputs[0].WitnessUtxo = &wire.TxOut{
		      Value:    0,
		      PkScript: outputScript,
	      }
      
	      // Serialize PSBT
	      var buf bytes.Buffer
	      err = psbtToSign.Serialize(&buf)
	      if err != nil {
		      log.Fatal(err)
	      }
	      psbtHex := hex.EncodeToString(buf.Bytes())
	      log.Println("PSBT:", psbtHex)
      
	      // Encode PSBT to Base64
	      psbtBase64 := base64.StdEncoding.EncodeToString(buf.Bytes())
	      log.Println("PSBT Base64:", psbtBase64)
      
	      u, err := psbt.NewUpdater(psbtToSign)
	      wif, err := btcutil.DecodeWIF("")
	      if err != nil {
		      log.Fatal(err)
	      }
      
	      privKey := wif.PrivKey
      
	      prevPkScript := u.Upsbt.Inputs[0].WitnessUtxo.PkScript
      
	      outPoint := wire.NewOutPoint(prevoutHash, prevoutIndex)
	      a := txscript.NewMultiPrevOutFetcher(map[wire.OutPoint]*wire.TxOut{
		      *outPoint: {},
	      })
	      sigHashes := txscript.NewTxSigHashes(txToSpend, a)
	      witness, err := txscript.TaprootWitnessSignature(u.Upsbt.UnsignedTx, sigHashes,
		      0, u.Upsbt.Inputs[0].WitnessUtxo.Value, prevPkScript, hashType, privKey)
      
	      u.Upsbt.Inputs[0].TaprootKeySpendSig = witness[0]
	      u.Upsbt.UnsignedTx.TxIn[0].SignatureScript = scriptSig
      
	      _, err = psbt.MaybeFinalize(u.Upsbt, 0)
	      buyerSignedTx, err := psbt.Extract(u.Upsbt)
      
	      if err != nil {
		      log.Fatal(err)
	      }
	      if len(buyerSignedTx.TxIn) > 0 {
		      var witnessBuf bytes.Buffer
      
		      witness := buyerSignedTx.TxIn[0].Witness
		      witnessLen := len(witness)
		      encodeVarInt(&witnessBuf, uint64(witnessLen))
      
		      for _, witnessElem := range witness {
			      encodeVarInt(&witnessBuf, uint64(len(witnessElem)))
			      witnessBuf.Write(witnessElem)
		      }
      
		      sigBase64 := base64.StdEncoding.EncodeToString(witnessBuf.Bytes())
		      log.Println("Signature Base64:", sigBase64)
	      }
      }
      
      func encodeVarInt(buffer *bytes.Buffer, value uint64) {
	      if value < 0xfd {
		      buffer.WriteByte(byte(value))
	      } else if value <= 0xffff {
		      buffer.WriteByte(0xfd)
		      buffer.Write([]byte{byte(value), byte(value >> 8)})
	      } else if value <= 0xffffffff {
		      buffer.WriteByte(0xfe)
		      buffer.Write([]byte{byte(value), byte(value >> 8), byte(value >> 16), byte(value >> 24)})
	      } else {
		      buffer.WriteByte(0xff)
		      buffer.Write([]byte{byte(value), byte(value >> 8), byte(value >> 16), byte(value >> 24),
			      byte(value >> 32), byte(value >> 40), byte(value >> 48), byte(value >> 56)})
	      }
      }
      
      // bip0322Hash создает хеш по алгоритму BIP0322.
      func bip0322Hash(message string) []byte {
	      tag := "BIP0322-signed-message"
	      tagHash := sha256.Sum256([]byte(tag))
	      hash := sha256.Sum256(append(tagHash[:], append(tagHash[:], []byte(message)...)...))
	      return hash[:]
      }
`

[jerempjerem]

Hi, did you finally suceed ?

[gamedevod]

Hi, did you finally suceed ?

NO(

[yemmyharry]

@gamedevod pls whats the wrong result you said you kept getting?
Meanwhile, you can look at https://github.com/LegReq/bip0322-signatures.

[trevormil]

Update: See #2077 (comment) for a working Go version.