I feel I sort of have to use some kind of click analytics, because in a previous contest someone lied. I was thinking of using steem.link but I can't get in touch with the author. :( For google, you can see the reference link by adding a + behind the google link. I believe it's the same with bitly. I will edit the article so people can see the analytics pages. It's not used for hiding, its for tracking. I put a disclaimer at the bottom.

For instance: https://goo.gl/5JA9KD+ will show you the analytics page and original url.