EDIT: I looked at the javascript source for the verifier on their page and unfortunately it's a bit over my head. Everything I know has been self taught, and Mersenne Twisters and Fisher Yates still stump me. Sorry that I can't help on this one.
Hey RGBKey,
We use open source Mersenne Twisters and Fisher Yates shuffle (available from GitHub). The JavaScript verifier (available on our site) is simply a few functions that utilize those open source libraries.
Can I PM/email you? I'm happy to walk you through the entire code as well as help you create a 3rd party verifier on your site.