FEP-c390: Identity Proofs is a new Fediverse Enhancement Proposal (FEP) that was just created that describes a mechanism of linking cryptographic keys to ActivityPub actor profiles.
Find the draft proposal here https://codeberg.org/fediverse/fep/src/branch/main/feps/fep-c390.md
Feedback is appreciated at https://socialhub.activitypub.rocks/t/fep-c390-identity-proofs/2691
@tchambers Yes from what I understand, and I'm not the author, the previous methods would use a rel tag where this uses a cryptographic proof instead.
You might want to contact @silverpill (the author) for further questions but if you have constructive feedback to share those in the SocialHub thread.