Nice try, the server seed changes with every bet. Seem like a scam.
Huh? Of course, it has to change every time else everyone would be able to form the right client hash and nonce and win big every time. Server hash has to change for every bet, and they can use the Verification page to confirm their bet integrity.
You have a weak understanding of how provably fair works. Please take time to review how any major dice site (PD, betking, bitdice, etc.) work. They commit to a server seed and let you pick a client seed, that way they cannot pick a server seed that would be biased. The nonce increases automatically with each roll. When they player wants to verify, he can change the server seed and thereby reveal the old server seed in an unhashed form.
This is basic stuff, really. Do your homework before starting a site that accepts money.
It's perfectly fair. You change the server seed each roll or the dice game will be cheated. That's how it's done.