It hasn't been working, so I posted to the bug forum, and then noticed that I had posted the same thing there 11 months ago. Oops. So I'm guessing the developers are MIA.
Is there something else that does the same thing that works?
Obviously I don't do "real" authentication on comments here (you can type whatever name and email you want) but I liked this plugin because it made "don't lie" be just one click.