[zeveb]

> Signal has built a simple, seamless, and beautiful messaging platform whose security is based on solid cryptography, not marketing, bug contests, or chasing the latest tech fad.

I love Signal, but it really could use non-phone-number identifiers (this could be easily implemented e.g. with tel: & mailto: URLs) and federation.

One place where Signal falls down is visible with the recent Haven app[0], which uses the Signal network to send messages. This is wonderful, but unfortunately it requires a second phone number to register the Haven device.

[0] https://play.google.com/store/apps/details?id=org.havenapp.m...

[tryptophan]

Matrix/Riot.im seems to meet your requirements. Best(open source) messaging protocol I've found so far.

https://matrix.org/