Its not. It isnt even possible to have that be provably fair and any claim as such is just a total lie because its missing the client seed. You cant have provably fair without a client seed.
We publish the number of the block we are going to use in advance. The hash of that block is the client seed. I know you have an extremely low intelligence level but please try to understand the basics before making a fool of yourself.
Besides, that lottery is garbage anyway, dont even bother trying to play it. You will never win it. You have about as much chance as winning the power ball which would provide you a way larger return.
Does Powerball give tickets away and can you buy one for $0.0000613?