I don’t recall if I’ve been asked this question before. The "Amber" you mentioned is likely referring to NIP-46 Nostr Remote Signing, right? We are very likely to support NIP-46. NIP-46 requires a relay to facilitate signature requests and signatures between a third-party app and a signer app, even if both apps are on the same phone. Therefore, we feel that NIP-46 is not entirely perfect. Perhaps for this reason, NIP-55 Android Signer Application emerged. In this approach, signature requests and signatures between a third-party app and a signer app (NIP-55) on the same Android phone are handled through internal system communication, without the need for a relay. This solution is better suited for most scenarios. However, iOS does not support NIP-55. There’s no perfect solution yet, and we are still contemplating.

GitHub

nips/46.md at master · nostr-protocol/nips

Nostr Implementation Possibilities. Contribute to nostr-protocol/nips development by creating an account on GitHub.

GitHub

nips/55.md at master · nostr-protocol/nips

Nostr Implementation Possibilities. Contribute to nostr-protocol/nips development by creating an account on GitHub.