This uses signal-cli[0] (communication happens over D-Bus) and signal-cli in turn uses a patched version of libsignal-service-java[1]. The latter might be used

This uses signal-cli[0] (communication happens over D-Bus) and signal-cli in turn uses a patched version of libsignal-service-java[1]. The latter might be used in some of the clients provided by Signal (not sure) but the signal-cli + libsignal-service-java combo talks to Signal servers instead of any apps running locally. Nothing is stopping you from building a web client for yourself. [0]: https://github.com/AsamK/signal-cli https://github.com/AsamK/signal-cli [1]: https://github.com/signalapp/libsignal-service-java https://github.com/signalapp/libsignal-service-java