Directbet, please provide how you compose the string that you hash using the sha512 algo.
You can find all the details here :
http://www.directbet.eu/Rules.cshtml#DiceYou can also reveal the secret of your bet and then click 'Verify' next to the lucky number. This will walk you through the entire process of the dice roll, including the SHA512 hashing.
Please feel free to contact me for any further information.