I'm fairly new to Keybase, but essentially, at it's core, Keybase is a software/service for managing trust of identity/public keys, and easily sharing public ke

I'm fairly new to Keybase, but essentially, at it's core, Keybase is a software/service for managing trust of identity/public keys, and easily sharing public keys with "trusted" parties, based on Keybase's trust model. All of the other features you've mentioned are built on top of that key exchange, and use it to offer encrypted services.