I'm intrigued by how these signature campaigns work.
The kudos go to the admin and the management of the forum, it's one of a kind. I guess you want to replicate it on your site as well, it's a free world...lol. Anyway, it happened here first and that can't ever be removed.
Perhaps you are such that want to bring your project down here for us to advertise for you, you are also warmly welcome.
How do these companies know you pasted their html in your signature and that they should pay you? Do they pay a fixed amount per post or a fixed amount per week? How much do they pay on average for each rank? Or is it not the rank but the merit which determines your income?
It's simple, as you see the signatures embedded beneath every post, if you put a cursor on them, you will realize that they are clickable, not for viewing alone. You can click it and it will redirect you to the website of the sponsor. By this, they get to keep track of the traffic we send to them and also know the converting ones.
The above style is general which most campaigns use, but it could also be more than that where each participant has a unique link that can be tracked to them.