Bitzino introducing provably fair betting is one of most impressive innovations in the history of online gaming.

It's interesting though that the technique they created didn't depend on blockchain or any Bitcoin specific crypto, theoretically it should have been able to be invented by any number of well funded online casinos well before Bitcoin came along.

What seems to have really drove innovation wasn't a technical break through but simply the change in thinking and clear interest from a customer base that Bitcoin based gambling brought.