@travisfw@yarmo@musicmatze I don't know if it is, but that's the point? It's a way for an individual to say hey, these are all my accounts and I'm linking them with my public key
You add proofs to your own PGP key and publish it, these proofs correlate to something you've added to an account you control. I.e. https://gitea.loranger.xyz/rob/gitea_proof
The web app, which is also self hostable, just looks up your key and verifies the proofs are signed by your hey and exist on the related account as seen here https://keyoxide.org/hkp/rob@loranger.xyz