That is pretty common thing to have in PrimeDice actually


You need to know about provably fair. Basically provably fair prevent / make it harder for the house to cheat the rolls. The rolls number are generated randomly with a combination of server seed and client seed so

Algorithm(Server seed + client seed) << Client seed will be whatever you wish to put in there and that means each time you change your client seed the roll number will be different

For more knowledge about this visit http://dicesites.com/provably-fair and if you think you are being cheated you can verify the number here http://dicesites.com/primedice/verifier