So, I was just sitting here noticing registrant alert emails from domain tools. It tells me every time my whois is changed to or from my name/email/whatever. That got me thinking, what if I changed whois every time I got this alert? Would that let me know exactly how many people looking up my site through domain tools (im guessing there is a minimum cache period, but still might give a hint)?
I don't have a proof of concept and haven't tried but maybe someone wants to give it a go and can say whether it works or not.
