We were aiming to have the draw time maybe +- few minutes or less.
Pretty much impossible to do this if you pick the block a few days before the drawing. The network is sometimes blockless for half an hour to even an hour, which makes having the draw time within a few minutes almost impossible. Your best bet would be to announce the block ~2 hours before the drawing (so people can verify what the block number is), and announce a block that is estimated around 30 minutes after the wanted draw time. People won't complain about a draw being a few minutes late, which is better than having it drawn too early.
It is currently provably fair. We should instructions soon to make it easy for you to verify the drawing
Thank you!
Good job trying to make it provably fair, but I can tell you without knowing the system that is won't be provably fair. I'm guessing you use a script that converts the hash into a number, which is pretty good, except that the public doesn't know what ticket number they have, and that you guys could easily swap a ticket around so that your alts win, making the other person lose instead. To combat this, try adding tickets live, and having a page display who owns what ticket that is updated every few minutes. That way, you can't swap the ticket numbers around.