The original poster is obsessed with anonymity
He just thinks this would be a great tool for people to check their anonymity. Just like port scanners and exploit frameworks are great tools to check the security of web servers.
I also like the comment of Phinnaeus about the "look-at-me society". People do not always choose for anonymity: sometimes publicity is more attractive. However, I believe this should always be a choice. And I don't think this datamining-idea is the right thing for showing that a certain transaction belongs to you. It is much easier to do that reliably with a sort of signed message system, maybe with a sort of Public Key Infrastructure for identity verification.
This, to address the bolded phrase above: