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Woman sues casino that offered her steak dinner instead of $43 million jackpot - Jun. 15, 2017

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"'You can't claim a machine is broken because you want it to be broken. Does that mean it wasn't inspected? Does it mean it wasn't maintained?,' Ripka told CNNMoney. 'And if so, does that mean that people that played there before [Bookman] had zero chance of winning?'"

Woman sues casino that offered her steak dinner instead of $43 million jackpot - Jun. 15, 2017

This might actually be a genuine shared ledger use case. Think about it: the state of a gambling machine (the result of each “roll”) needs to be recorded. It needs to be recorded somewhere that is not under the control of the machine operator and it needs to be recorded somewhere that gambling regulators can access and than lawyers can discover. You could have every machine send its results into a big database somewhere, but then rival casinos would see how each others machines are doing.

Consider an alternative scenario. After each roll, the machine state is encrypted using the regulators public key 

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