tbh: I don't like this terminus "non-custodial".

why should I describe sth positive with "non"?

rather "sovereign" - much better.

example?

"The universe of Nostr applications is growing, join it with Nsec.app — a safe non-custodial key storage with remote signing."


wIP (wording ...):

The universe of Nostr applications is growing, join it with Nsec.app — a safe sovereign key storage with remote signing.