The raw outcome on that bet is high enough to win jackpot 1 with a bet of only 15 bits. You can find more detailed information on the jackpot tab on our site.
First if I not mistaken jackpot is hit equal to the percentage on how much they wagered, 15 bits can hit 0.5 btc, I would assume thst you have got pretty huge amount of jackpot stored on the site. Second, I wondering too how can with 15bits can get 0.5 btc? Usually 0.01 btc can get all the jackpot and with 15 bits, it should be 10-20%. So how is it possible to have this really big payout?
The chance to hit a jackpot depends on the bet amount. For example with a 1000 bits bet the chance is 1/500k, a 1 bits bet has only 1/500m chance. If you hit the jackpot you get 90% of the amount and 10% goes to the player with biggest wagered in the last 24 hours.