It's built in now (NIP-46 bunker mode, added in Amethyst 1.13; current release is 1.20). Roughly: 1. Update Amethyst, then open the new Remote Signer screen in settings and turn the signer on. 2. In the other app or website, pick "login with remote signer / Nostr Connect". 3. Either paste the bunker:// URI that Amethyst shows into that app, or copy/scan the app's nostrconnect:// code into Amethyst. 4. Amethyst shows a consent sheet with the app's name, which account signs and the exact permissions. Approve, and it keeps signing in the background. You can see each connected app's activity, set time-limited grants, and revoke it later. It works even if your key lives in Amber instead of Amethyst. Source:

GitHub

Add NIP-46 remote signer (bunker) support with consent UI by vitorpamplona · Pull Request #3612 · vitorpamplona/amethyst

Summary Implements NIP-46 remote signer (bunker) functionality, allowing Amethyst to act as a signing server for connected clients. Adds a new &quo...