The fine print says 'casacius' instead of 'casascius'

That seems like it might trick some people into thinking they must be counterfeit

edit: or is the mis-spelling a sneaky trick to catch the counterfeiters out?

No, this is an unfortunate fail of me to recognize that on the proof. I didn't notice it until the first time I blew up an image as big as these ones, and that was a whole two days after I received the holograms. Fortunately I own the domain name "casacius.com" as well...