It has no links to my main pages or any pages that is associated with me. Yet he knew...
I am thinking it must be some extraneous service that is able to check the whois info even if it's cloaked?
It can't be this site - it is not hosted where my main sites are, it has ABSOLUTELY no relation to anything I've done in the past. I have not put any "comments" on the pages either...
The only give is that the domain is registered under my name - but I paid godaddy for the cloaking...
Is there a service out there that will let you bypass such domain info cloaking?
I would think it is very unlikely to verging on the impossible that he got the details from Go Daddy, who are a reputable company with a good track record. They are not going to get hacked that easily, and anyway, would this guy have gone to the extent of hacking a major domain registrar just to identify the owner of one domain?
If you really think it was them, report it to their customer service department and see what they have to say, but I think you are making some exaggerated and almost certainly unfounded allegations.
If you and your competitor know each other enough to talk at conferences and you look at each other's sites all the time, it wouldn't be hard for them to deduce your involvement. Sorry, it doesn't sound like it's any fault of Godaddy... :(