Take a cryptokey routing-based network such as https://yggdrasil-network.github.io https://yggdrasil-network.github.io, cjdns, hyperboria or (I think) TOR. The

Take a cryptokey routing-based network such as https://yggdrasil-network.github.io https://yggdrasil-network.github.io, cjdns, hyperboria or (I think) TOR. The crypto-addresses be used as contact information, and users can message each other any way they want: e-mail, netcat, a dedicated application, etc. End-to-end encrypted, no WAN connection needed on mesh networks. Now, the hard parts are: - Persistence - Async communication when one of the hosts is offline. - Multiple devices pertaining to the same user, with key revocation, etc. The firsts are why I'm excited for things such as Matrix. I'm not sure about the last (and is there really a problem in the first place?)