Systems for validating wagering game data are described herein. In one embodiment, an apparatus includes an application program configured to transmit a request for wagering game data. The apparatus can also include a wagering game data security controller configured to detect the request. The wagering game data security controller can include a wagering game data processor configured to fetch the wagering game data and a reference value from a data store. The wagering game data security controller can also include a wagering game data validator configured to compute a comparison value based on the wagering game data, and to determine whether the comparison value is equal to the reference value. The wagering game data security controller can also include a notifier unit configured to present a notification if the comparison value is not equal to the reference value.