Multiplayer Data Storage

Hello,

I'm working on a multiplayer (p2p) non-dedicated game and I'm trying to figure out how to save things like, levels, money ect. I've reviewed the FileSystem docs but I'm wondering how this works to prevent users from going into the saved .json files and modifying the data, to effectively cheat? 

Is there an alternative to the FileSystem API or another approach which would allow me to save a players data and prevent cheating via modifying the json?

I'm fairly new to S&Box development so any suggestions would be greatly appreciated, thank you!

Stats service should do you just fine if you're just saving stats, levels, money, etc.

https://sbox.game/dev/doc/services/

Thank you!