Introducing a JackpotCoin Slot Machine

It's not very easy to make provably fair online slot machine.
How can you believe that server side generated random number is true random?
Or, how can a client generate random number accepted by server eliminating a tiny possibility of hacking attempt?

I've come up with an idea.
1. No one can predict upcoming block hash.
2. Roll the slot. Server generates 4 random numbers between 0~15.
3. Wait for the next upcoming block hash.
4. Pick the last 4 digits of the block hash, which are supposed to be evenly distributed within the range of [0,1,2,3,4,5,6,7,8,9,a,b,c,d,e,f].
5. Compare how many of them are matching.
6. Luckily JackpotCoin block generation is average 20 seconds. Don't have to wait for too long.

Loock at the screenshot below.
http://i.imgur.com/jJHzToP.png

Interested? Come and try. Coins On Table have added a new game, JackpotCoin Slot Machine!
https://cryptfun.com/cot/

Pay table
The full award starts from 2,000,000 JPC.
When any player inserts a coin, it will be accumulated into the machine.
4 matches will take 100% of accumulated coins in the machine you are playing.
3 matches will take 5% of accumulated coins in the machine you are playing.
2 matches will take 0.5% of accumulated coins in the machine you are playing.
1 matches will take 0.1% of accumulated coins in the machine you are playing.
Whenever the accumulated coins fall below 2,000,000 JPC, the system will refill it to 2,000,000 JPC.
10% game fee.

For some, this could be felt a bit too slow.
Blue machines are fast, more intuitive and fair, but it's not provable.
http://i.imgur.com/rJEv0kI.png

You can also enjoy player-vs-player rock paper scissors game.
https://cryptfun.com/cot/

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