Hello , i am sorry that i still not understand all just a litle.
First i know this quote can help to proof the the bitcoin address is linked to the bitcointalk account but how to proof that the address is mine??
For example my account is hacked, and i make newbie account to inform to moderator about my account, then i can proof if my old account is linked to sign message in bitcoin address. But how i proof that the bitcoin address is linked to newbie account?
Thanks before.
If you staked an address here that's mean that you have a full control of it and that you can sign a message with it at any time.
Now for example member x has staked an address here than a year later his account was hacked. All he needs to do is to create a new account then sign another message with the same Bitcoin address.
Since you are the only one having the same address then the first account member x is definitely yours.