Removed: messages, call logs, contacts, group memberships and profile data. The servers are built to hold as close to nothing as possible.
Outcome: a US grand jury subpoena for subscriber records returned account timestamps and nothing else, and the company said so in public.
When a US grand jury demanded subscriber records, the company could answer with account timestamps and nothing else, and said so in public: “we cannot share data in response to valid legal requests that we never had in the first place”.
The design decision that protects Signal’s users from Signal also protects Signal: there is nothing to hand over, leak, or be compelled to produce.
Source: Signal, grand jury subpoena, District of Columbia (6 March 2026)