There is lots of info in this thread. I'm linking to page 3 which has a lot, but page 1 and 2 may have info too.
There are different ways people can steal your commission but one of the most nefarious is parasite adware. See the video I linked to in post #65 to see how they do it.
Clickbank - Not a Good Place for Newbies to Start
I'm not sure how much tiny helps but I would not mask that way anyway as it looks spammy and I would think it would scare away more clicks than you'd lose through commission theft, which is probably only a very tiny percentage. Best way to cloak IMHO is through your own domain. mysite.com/productname. Then it looks like another page of your site, plus has the name of product so helps consumers feel they will get to the right info instead of being afraid of where they will land with a blind URL like tiny. Plus I read that ZoneAlarm firewall blocks tinyurls.
That type of link cloaking is done through HTaccess.
There are a bunch of ways to hide links, here's one thread and there are a bunch of others if you search the forum for cloak links or hide links.
encrypting affiliate links