All these methods - no matter if client side, server side or manual, work only for obvious cheating - like you take CUP and beat Malak but if the cheater stays in the boundary of what is possible (even with 1:1000 probability) this system would just replay the data, see that it is possible outcome and validate it as ok.
If we cannot trust data sent from cheating device, there will always be a loop hole.
Plus I'm not a fan of any processing done on battery powered device which I didn't ask for. It could be quite controversial feature. I wouldn't be surprised if this was against some policies on Apple Store or Google Play.
