This is my question, too. From TFA: >there’s no need for them to register or create an account just because it’s E2EE, and it still supports persistent messag

This is my question, too. From TFA: >there’s no need for them to register or create an account just because it’s E2EE, and it still supports persistent messaging. How does that work? Arathorn in a sibling comment says that there's out of band something, which I interpret to mean some verification process, but for the life of me I can't imagine what that process might be or how it might work without any sort of account... unless the client generates a unique a key per user session and coordinates the key exchange with a single host server behind the scenes to encrypt that session's data? What am I missing?