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by hprotagonist 1975 days ago
Signal and the ACLU sued and were granted permission to release sealed warrant data from a previous law enforcement request for user data.

As of mid-2016, and trusted as much as you feel like trusting something attested in a court of law, Signal stores: a bool (is this phone number a user) and two ints (epoch of signup, epoch of last transmission).

https://www.aclu.org/open-whisper-systems-subpoena-documents