>>536793845
If you finish it with all of the lights on top illuminated you get a jackpot bonus.
4 buffs if you finish with a Heavy attack.
1 buff if you finish with a light.
If you want to finish with a Heavy, start your heavy when all but two lights are lit up, like in this pic.

For any new-friends and returners who perhaps are not aware; when you get a Sinner's Sacrifice machine to low health a minigame begins where the lights on top of the machine will light up from left-to-right.
If you finish the machine off with a heavy attack when all of the lights are illuminated, you hit the Jackpot and will receive FOUR random Golden Statue stat buffs as a reward, you can do this with every machine you find to get a lot more stat buffs than usual, and you can get the same stat multiple times from each Jackpot potentially leading to unexpected spikes in Spirit Power or Weapon Damage.
To guarantee that you hit the Jackpot, start your heavy attack when all but the last two of the lights are lit up like in this pic.
If you use a light attack to hit the Jackpot you will only get 1 Golden Statue buff, so practice the timing for it on the practice range to ensure you always use a heavy attack to get the Jackpot bonus.