this post was submitted on 17 Feb 2025
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Yeah look: https://github.com/signalapp
~~Their backend is closed source.~~
[EDIT: Incorrect, see below]
https://github.com/signalapp/Signal-Server
On Wikipedia it says the servers are open source but spam prevention is proprietary.
Thanks for the correction. That's pretty rad. Now I'm wondering if that's a wrong memory or if it was released in the last few years.
There was a fuss a while back since the released source appeared to be waaaay out of date compared to what was being used.
They came out and said that they wanted the usernames feature to be developed fully before it got pushed public. Which they then did.