Anyone can run your code on their computer, connect it up to a Hive API node, verify all the game transactions, and determine who really won each game.

How would you go about verifying all the game transactions through a Hive API node? Is there a way to pull a subset of all the blockchain custom_json transactions, i.e. only those custom_json that are flagged as belonging to your game? And only for a certain set of users?

I didn't think that this kind of detail was currently possible through the API? I'd be very happy to be wrong.