I own the username , Password , email of my account . but I see that some people have those informations and are unable to recover their account , why is that ? what else should we provide , and what's that "PGP" sig or whatever and where to get it ?
thank you guys
If your account is hacked and the hacker changes your email and password, the only thing you can do is send proof that you own a bitcoin address tied to your account to theymos (usually one that you have put in an old post). This is done by using the message signing feature of your bitcoin client, which allows you to put an unforgeable digital signature on a message that proves it came from the owner of a specific bitcoin address. But theymos is a busy guy and doesn't do many of these requests, so most people just make new accounts.
See here:
https://bitcointalksearch.org/topic/recovering-hacked-accounts-or-accounts-with-lost-passwords-497545