I went through this while experimenting with cryptocat, it's confusing as hell. the group fingerprint is your fingerprint, in that chatroom, for that session.

I went through this while experimenting with cryptocat, it's confusing as hell. the group fingerprint is your fingerprint, in that chatroom, for that session. I peeked at some of the issues on Github and it looks like they're adding challenge-response for OTP verification so you can have a way to prove identity without an active out of band channel.