Validation of device activity via logic sharing

Methods and systems for validating device activity by way of logic sharing are presented. In an example, a text file comprising a script defining programming logic to be executed in conjunction with an online game is transmitted from a server device via a communication network to a client device. Input data for a client-side application executing at the client device for the online game is received at the client device. The input data is transmitted via the communication network from the client device to the server device. The script is executed at the client device from the client-side application using the input data to produce a first result. The script is also executed at the server device from a server-side application using the input data received from the client device to produce a second result equal to the first result.