Keybase is a secure messaging and file-sharing app and software that use public key cryptography to ensure your messages stay 100% private.
The main feature of this messaging app is that messages can disappear and pics too, they are using crazy encryption and cutting-edge software.
Keybase is offering cloud storage too for your pics or videos and you can share them anonymously with your fans from the app or site.
Many adult creators are using this service because the messages are not visible not even to the keybase admins.