Walletwasabi: Enable PSBT signing in airgapped wallet instance

[tsegreti]

Currently the only way to sign a PSBT is to use a hardware wallet like Coldcard. It would be great to be able to sign PSBTs in Wasabi Wallet itself. This would enable an air gapped machine to run an offline instance of Wasabi Wallet for the purpose of signing built transactions from a watch only wallet instance on a connected machine.

[MaxHillebrand]

duplicates #2190 #933

concept ACK, that would be a great feature to have.

[nopara73]

It's a bit different and simpler, as this feature request doesn't want air-gapped wasabi, it only wants signing.

In terms of implementation it is much simpler, since the previous air-gapped mode feature requests wants Wasabi to be able to operate offline, while this does not specify that as a requirement.

[molnard]

Hmm yes, it is possible.

[nopara73]

I don't know what I was talking about. This feature request is clearly about air-gapped wallet 🤣

[davterra]

Is this feature enhancement still under consideration? Even though I use a Coldcard with Wasabi,
I would love to see this.
IMO, the main feature that makes Electrum in a UX way, better than Wasabi is the ability to have an air-gapped instance for signing...on an off-line computer or an air-gapped VM. Having an online hot-wallet for CoinJoins, and an air-gapped cold storage wallet would be nice, especially for those without
a hardware wallet.

I'm writing up a Virtualbox page for the docs to complement Max's recently added Qubes page.
If implementing #2474 or #2190 is feasible anytime soon, I'd love to know yes, or no.

[nopara73]

It's not NACK-ed, but it also isn't priority by any means.

[yahiheb]

As decided we are now closing duplicate issues. For more details see #2190