On how to sign the TX, it would be an SD card PSBT dance between the internet-connected Sparrow computer and the non-internet-connected Tails+Electrum computer, much like the previous PSBT SD card swapping between Sparrow and a Coldcard. Between computers, a separate USB stick could also be used in place of an SD card, so that would be the "air gapped" part. Or I guess QR codes would even work with the webcams, though clumsy on laptops!

tokyo_vyse

Sounds like a complicated setup. You might want to look into how you sign the TX using tails+electrum when on an air gapped computer.

Perhaps complicated, yes. It feels like the fast-moving vulnerability uncovering by the likes of Kimi K3 is making multi-vendor multi-sig a near necessity though, so I'm just looking here at one of those signatures being something 

 than yet another flawed hardware wallet. At the same time though, we do not want to trap ourselves in overly complicated setups, so looking for all the pitfalls before making a drastic change.

bitcoin

Tails+Electrum as an alternative to a HWW as part of a 2-of-3 multisig?

> Sounds like a complicated setup. You might want to look into how you sign the TX using tails+electrum when on an air gapped computer.

Perhaps complicated, yes. It feels like the fast-moving vulnerability uncovering by the likes of Kimi K3 is making multi-vendor multi-sig a near necessity though, so I'm just looking here at one of those signatures being something *other* than yet another flawed hardware wallet. At the same time though, we do not want to trap ourselves in overly complicated setups, so looking for all the pitfalls before making a drastic change.