You should use the free points oldminer gave you and have a try, you will see its quite easy to win

Not sure how to be "provably fair". Its a different type of game, and only pays out when there are losers, same way as any modern slot machine.

The main difference is the odds payout, Bitwin is 98%, while pub/casino pokies and most online ones are set to less than 90%.

This means Every 100 you bet, regardless whether you win or lose, 98 goes back into the prize pool, with 2.5% of that going into the jackpot pools, if its a jackpot game.

When the game draws a hand, it checks if there is enough funds in the prize pool to cover the win, if there isnt it will make you lose.
 
however what you need to realize is table games like roulete, blackjack, sicbo, etc mathematically have the same odds to win as a live casino game, which is around 80-90% return, which is way less than the prize pool, so it would be rare that the prize pool would not have funds to cover wins on those games. So playing those is just like a live game.
 
To summarize:

If you win 98 points, it means somone has lost 100 points