nneuman on Nostr: More secure than mobile key, less secure than Coldcard. Not sure about Jade as I ...

More secure than mobile key, less secure than Coldcard. Not sure about Jade as I haven’t fully reviewed the security model.

Basically we called yubikeys “cool keys” because they aren’t quite totally cold keys, but they also aren’t hot keys. The yubikey stores the bitcoin key, but then your browser signs with the key. So the key becomes hot when it’s being used, then is thrown away by the software and remains cold for storage on the yubikey device.