Thank you, verify signature?
Proving you own the address that the funds were stripped from doesn't help you at this point.
If the authorities get involved and happen to find the culprit, and (eventually) proceed to returning the bitcoin to it's rightful owners, then maybe they'll ask for a signature verification. But the odds of that happening are slim to none.
Like Lucius said, you're not likely to ever see that money again, unfortunately. Hopefully you didn't lose much and will be able to recover from your loss. Think of it as paying for an education, and knowledge is priceless.