Coinjoin watch only address not compatible with taproot

[tamebull]

Hi, reaching out for some support here.

I added some watch only wallets to wasabi following the guide here (https://docs.wasabiwallet.io/FAQ/FAQ-UseWasabi.html#can-i-import-a-watch-only-extended-public-key)

For some background, I'm using Ubuntu linux (24.4.1), with Wasabi v2.3.0. The wallet I connected is a cold storage wallet that I made on Electrum. The wallet was giving me an zpub, but to import wallet as watch only, wasabi needed xpub, so I converted it using jlopp's conversion tool (https://jlopp.github.io/xpub-converter/). My intention was to coinjoin some sats and set the output to my cold storage.

Initially I wasn't able to get Wasabi to recognize the wallet, as it wanted a TaprootExtPubKey key as well, which Electrum doesn't supply. So here I put in the same xpub as I got from the original zpub showing (probably a mistake).

I used the coinjoin feature and set this watch only cold storage wallet as the destination. The coinjoin confirmed. Now, it is showing output addresses that not associated with my Electrum wallet xpub.

Coins have been sent via a taproot script, and have gone to addesses not associated from my electrum xpub. Some coins show as segwit, and these ones do show up in my electrum wallet.

How can I recover these 'lost' coins. : / ??

[lontivero]

The easiest way I can imagine to fix this mess is to import your seed in wasabi and then, before doing anything else edit the wallet json file to replace the xpub for taproot with the same xpub used for segwit. After that start wasabi and let your new wallet to synchronize.

[tamebull]

Thanks for the response. Can you explain how I replace the xpub? Is it a matter of tagging -taproot on the end?

[lontivero]

Forget it, that won't work. What a mess.

I think you will need to create the output descriptors with the secret material for both taproot and segwit and import them in a wallet that supports output descriptors.

[tamebull]

Can you explain how I might get the output descriptors? Wasabi doesn't have any fingerprints stored. Any other suggestions?

[lontivero]

No, I don't have any other suggestion. The only way I can imagine an user can solve that is by creating the output descriptor for taproot with the xprv and the m/84/0/0 path, and importing that in a wallet that supports importing output descriptors.

[tamebull]

Thank you. I did exactly that in Sparrow, once with the xpub I provided to Wasabi (watch only) and another time with an xprv I loaded using https://iancoleman.io/bip39/. The two wallets loaded a different string of addresses. The watch only one shows the UTXO's that came from the coinjoin. The wallet with private keys, no UTXO's. I also tried using bitcoin core to import output descriptor based on my the same xprv, but it didn't work.

The watch only wallet from sparrow prompts for a hardware wallet to sign when I try transacting. I don't suppose there is any way to configure something with this?

[tamebull]

I followed this process and was able to recover the spending keys for my coins:

"In Sparrow Wallet go to "File" -> "Import Wallet..."
Next to "Electrum" click "Import File..."
Locate the Electrum wallet file (usually in ~/.electrum/wallets/)
You are asked to name the wallet. Click "Create Wallet".
Optionally set a password
Now you have imported the wallet and your SegWit Coins should appear.
Switch to the "Settings" tab
Change "Script Type" to "Taproot (P2TR)"
When asked whether to clear the keystores, select "No"
Click "Apply"
Now you should see your "lost" Taproot coins, ready to be spent." 

Nvtless, thanks for the guidance lontivero

[lontivero]

Happy to hear you recovered your money.