Nice updates to that stats page.
Is "WON BY USERS" is a gross figure mostly cancelled by lost bets?
No, its just gross winnings by the users ie. not cancelled out by losing bets.
OP, are you still working on the whole provably fair thing?
No, it is working fine, why do you ask ? You can click on the provably fair link on the multiply BTC page to see seeds for your previous and next roll.
Sadly, I had to add a house edge for the Multiply your BTC game as bots were bleeding it dry. It's currently at 5% but I will lower it if it exceeds break-even.
Bonus activated for those who posted.