I would take a look at Matrix[1], which is basically what you're describing (it's a federated replacement from group chats that has Signal-like E2EE and has an

I would take a look at Matrix[1], which is basically what you're describing (it's a federated replacement from group chats that has Signal-like E2EE and has an open protocol) and it's already implemented. [1]: https://matrix.org/ https://matrix.org/