No where it’s written that the wager should be one single wager.
It’s your accumulated wagering amount in the last 24 hours.
Thanks for confirming. I think it’s not that hard to pull off since you’ve got 24 hours to keep betting. If luck’s on your side, you can grow your bankroll and at the same time hit that $1,000 requirement for a shot at winning 1 BTC. Pretty solid promo, I don’t think I’ve seen any other casino offering something this simple with such a big prize.