How safe are "clientr" variables?

Greetings!

I am working on a economy system for a playerworld and I found one problem:

It would be the easiest and most logical way to set every players individual amount of currency with clientr variables.
But I am not sure how safe they really are, even though they can only be edited on serverside...

Is using clientr variables a good idea?
Or does one of you have a better tip on how to do it?

Thanks for the help =)

clientr is actually safe, there are other options but theyre all GS1. So you better go with clientr.

Thanks I already got helped out by iMask I have gone with the ClientR.

Looks like you got your answer, so I?m gonna close the thread. Let me know if you want it opened up again for whatever reason