So this has to be plugged into the PC right? If so, I think the ideal use case is frostr, where you would only have to plugin the foundation device to the PC when you disconnect if from the internet, then sign the notes you need to recover some key or create new shards, and then go online to publish...

ah, so its talking to the device and app over serial. In that case what needed to be changed from the original Nostr Signing Device extension / protocol to get this to work? Also if your intending this to be a first class feature of the passport prime then I would suggest we come up with a new sign...

WTF how was I not following you.. This is amazing.