@Nafrondel it's an independently-verifiable bidirectional proof that this user on octodon.social is the same person as https://keybase.io/00dani ! the idea is to leverage your trust in other social profiles - for example if you already trust that @00d4n1@twitter.com is me, then using these proofs you can verify cryptographically that @00dani is also me! i proved all my masto profiles here https://00dani.keybase.pub/proofs

check out keybase.io for more info, that's where the idea came from :3