this post was submitted on 11 Jan 2026
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Signal have published several times when they receive a request for data and their response.
Due to the mechanisms they employ, all they can actually give is if there's an account associated with a phone number and the last time it logged in, if even that last bit. There's some fairly detailed articles diving into how this works so well under the hood from a cryptographic standpoint, but it basically amounts to even addresses of users being able to be secret to minimize shared metadata to a bare minimum.
Also the software is entirely open-source -- app and server both -- and are frequently audited on this. The server never has an opportunity to receive any plain-text data to store.
The weak spot is always just having access to your device.