I'm not sure, looks like it's either paused or abandoned from the github link. Whatever the state of it, there are fundamental limits that neither it nor anything else can overcome on iOS, the main limit being long-running background tasks; those can only be used for 7 or so specific things, and nothing on that list of specific things corresponds to signing Nostr events. (You have to use some clever workaround to keep the process going in the background, like playing silent music, which is cool but won't scale out of test flight as sooner or later a reviewer will see that.) And even if you go that route, you still run up against limits like the need to run the signer app every time you restart your phone etc. You basically need the cloud involved *somehow* for it to be a scalable and user0friendly UX, just no two ways around it.