SovereignOrigin on Nostr: 1. & 2. Not invite only - check 3. I think so... I'm only using this on non-mobile, ...

1. & 2. Not invite only - check https://getalby.com/
3. I think so... I'm only using this on non-mobile, on mobile I just copy the nsec around (not happy with that.. we wait for the technologies to develop 😉