I wish it was true and it was that easy , even though this is a reputable forum anyone can put a bitcoin address and then later "claim " it is theirs no?
here is mine :
1PbxtjqNRJoGgyoykvMkBJNwe8WtFbHDe
That's why you should post an address you can sign a message from,
that's something only the person with the private keys to the address can do and a common way to prove ownership.
More on how to sign and verify a message here ->
https://bitcointalk.org/index.php?topic=990345.0