http://keybas3nmhbh3bhasixeb7a2t55in7gdp4hhm5oesmfcsvql6nrkekid.onion/docs/privacypolicy
Team names and membership : If you create or join a team on Keybase, we collect and store the names of the teams and subteams, their membership, and when they were formed. Hashed password : We collect and store information about your Keybase password that allows you to prove you know your password; that “stretched” password is sent to Keybase’s servers.