How to detect traffic cheating through iframe?

Question

Analytics

For example, some webmaster offers me to advertise on his site, showing statistics of 1000 visits per day. How to find out that he is not deceiving and the statistics are not cheated?

Technically, he can, for example, have 10 sites with 100 visits and place an iframe on each site. And in the end, he will get a site with 1000 attendance, but in fact 0? It works? Will Google Analytics count such traffic? How to detect such situations?

How to check the honesty of statistics in general?

Answer 1

iframe protection
referrer
page checker
utm labels and behavior