You are talking about signed message? If yes, this is probably what you are looking for:
https://bitcointalk.org/index.php?topic=990345.0Tutorial how tovsign a message from the most popular Bitcoin wallets which have this function.
And then post your signed message here:
https://bitcointalk.org/index.php?topic=996318.440If your account will be hacked, you will be able to recover it by signing message from staked address and providing it to forum Admin.