A browser extension that communicates with an app on your phone for remote-signing, so the private key never leaves the phone - using fast local WiFi technology (i.e. WebRTC) instead of slow Nostr bunker. Like Whatsapp Web. Basically take this and make it a full product (maybe embed it in you existing app/browser-extension?):

GitHub

GitHub - oren-z0/noteguardian-extension: Note Guardian chromium extension

Note Guardian chromium extension. Contribute to oren-z0/noteguardian-extension development by creating an account on GitHub.

GitHub

GitHub - oren-z0/noteguardian-spa: NoteGuardian Single Page Application

NoteGuardian Single Page Application. Contribute to oren-z0/noteguardian-spa development by creating an account on GitHub.