Client-side or Server-side:
I think its client-sided, because Nexon because the only thing Nexon puts a lot of effort into server-siding is gp, nx, and exp. Considering there's already chams out for CA I doubt they would put much effort into server-siding it. I think it was just a way to get high-level players who cham a lot anyway to play legit.
As far actly scanning for the values... good luck. It will be hard to scan for a value in just 30 secs. That's how long the sat scan is up o_O?! Unless u have some kinda godly pc...