My previous company was looking into using it as a place to store the app's public key for that user and find other users of the app (with their public keys) wh

My previous company was looking into using it as a place to store the app's public key for that user and find other users of the app (with their public keys) while being able to verify them. At the time, Keybase didn't have the appropriate APIs to allow third-party integration like that. I haven't checked if anything happened on that front since.