I just read from wikipedia that youporn.com ownership is completely protected, how does the webmaster protect his anonymity actually? I'm thinking to start adult website sometime, but still afraid if someone might trace my identity and domain ownership.
Consider using a privacy service from your domain register. I don't see why it's such a big deal with someone can trace you.
One such privacy service is WhoisGuard from NameCheap, which I'm using myself for my domains. It works well.
it first you should have to use a captcha system then you can use some other like ip tracking script and use some bit system to reject spamp