How safe is this compared to using the mobile key or a dedicated signing device like Coldcard or Jade? It's kind of confusing.
Discussion
More secure than mobile key, less secure than Coldcard. Not sure about Jade as I havenât fully reviewed the security model.
Basically we called yubikeys âcool keysâ because they arenât quite totally cold keys, but they also arenât hot keys. The yubikey stores the bitcoin key, but then your browser signs with the key. So the key becomes hot when itâs being used, then is thrown away by the software and remains cold for storage on the yubikey device.