Technology preview: Sealed sender for Signal
Two observations:<p>1. You should look into what other messengers do with sender&#x2F;receiver pairs information. One very popular competing messenger logs pairs permanently, serverside, in order to make UI features work.<p>2. One of the least popular attributes of Signal (on Hacker News, at least) is its lack of federation and ability to interoperate with third-party clients. This feature is a pretty crystalline example of the kind of protocol change you can make when you control all the mainstream clients, and that would be an absolute nightmare for a protocol where you didn&#x27;t.