Isn ' t this very similar to troll trace ? <| sep |> Ok let me finish this trade real quick then i ' ll be ready <| sep |> Flew from ABQ to SLC this morning . High fives all around in Albuquerque from displaced Lions fans . flight crew was Minneapolis based , and they were feeling the wave of despair ready to break over them . <| sep |> Actually a company could archive its database regularly and store a hash of the database plus the previous archives hash and so verify a chain of archives . You also need to get a third party company to digitally sign the archive . This is much like git public key signing but you have a third party company make a signature . The third party company could also store copies of signatures and hashes without actually storing the sensitive data . This stuff is possible but unfortunately not many sites have the time or reason to implement it .