> Completely agreed about the nonsensical first claim. We have many third-party clients for other messaging platforms where privacy and security are a primary feature.

I can't think of an any with independent implementations.

For instance, have a few third party Signal clients, which work by using the official libSignal . These are not third party clients, but third party GUIs. Use of libSignal on the official Signal network is also not supported or recommended.

Likewise, all the third-party Telegram clients I know of are forks using Telegram source.

This makes sense, because neither of these are stable systems. A third party has to stay up-to-date with features and changes made to the official servers and clients.

Do you know of a security and privacy focused messaging platform which is both:

1. documented

2. has multiple independent implementations of the networking and security protocols?