I dont know if this has been done already or this way has been done or anything. but it just poped into my head today.
also, i know nothing about php but im sure this can be done.
we have 2 domains
domain "a" is our blackhat landing page or page you dont want the companys to see
domain "b" is our genuin page, the page we DO want the comanys to see
Ok
So basically the link on A goes to B
and on B there is a script saying -if refere is A redirect instantly to XXX (cpa offer) if not refere A stay on this page.
So if anyone else is going to that site you wont be redirected. you only will be redirected is you have come from the blackhat site.
I hope that makes sense.
I hope someone finds it useful..........unless thats how everying is being done already! haha
Regards
Mat