@evan @mayel I stand by my positions that an E2EE protocol:
a) should not allow a server to know who is in a conversation, so therefore server-level blocks cannot be applied (unless applied client-side)
b) if a conversation is reported to server admins/moderators, doing that report via E2EE really doesn't gain you anything over just TLS. Server will end up with that information in cleartext at some point. But you do want verifiability of the messages & their ordering and the actor IDs involved, probably a new object type to represent a Conversation.