One way to prove your ownership of your account is to sign a message from an address which you have posted before in the forum and is obviously yours.
The recovery team surely has some other criteria to verify the claims. For example, they can check IP logs.
Is this the only way one can verify his/her claim of an account in the forum, is there no any other way one can actually do it too asides signing a message?
If this is the most accepted and verifiable way to claim ownership of account, how is it done? A link or thread will help as a guide. Thank you.