[Admins]

I agree, best is to store data that should not be modified on server-side, and private modifyable data on client-side (like if you do some tool for saving comments about other players). If there is too much clientside data then you can still use md5 for making a checksum on the data and store the md5 checksum on serverside. You would need to update the checksum when you modify the file that should be protected.