"It’s the same set of “Account and Subscriber Information” that we provided in 2016: Unix timestamps for when each account was created and the date that each account last connected to the Signal service.
That’s it."
Signal offers a "registration lock" for the phone number used to register the account, so that another user cannot register using the same number (i.e. reusing VLNs and similar). If "that's it", then where is the phone number (or its hash) associated with the account stored in order to facilitate the lock?
Presumably they have a database of hashes. But they are already providing the information that the phone number is in use in their system. That is the only information that the hash represents.
That’s it."
Signal offers a "registration lock" for the phone number used to register the account, so that another user cannot register using the same number (i.e. reusing VLNs and similar). If "that's it", then where is the phone number (or its hash) associated with the account stored in order to facilitate the lock?