There's nothing to verify. Stunna knows his site is provably fair. The rolls will match the rolls given by the provably fair roll algorithm. The only problem is that the player knows his server seed. How can anyone ever verify that he doesn't know it?
I know it ain't possible, but then people should stop saying the Hufflepuff cheated as we don't have any proof...
There are many people winning such huge amount of profits daily, and so claiming this one to be a cheat if not possible to prove ain't better without any evidence...
Obviously since Stunna told us that he did cheat he has the proof to back up his claim... He wouldn't say that unless he had proof and as he posted he will make a blog post that will provide more info regarding this.