Keybase.io now supports Mastodon

Previously, Keybase only supported the mega-behemoths: Twitter, Facebook, Reddit, Github, and HackerNews. This new protocol change isn’t just for Mastodon; we’re ripping Keybase wide open, so any community can cryptographically connect profiles to Keybase.

https://keybase.io/blog/keybase-proofs-for-mastodon-and-everyone

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Has anyone used the keybase messenger?

Do you mean the messaging part of Keybase on Desktop, or the Keybase app? We used both of them.