Not sure I follow. Are you saying that by trademarking the fingerprint you can prevent SEO abuse?

The problem with any SEO mitigation is that the 128 bit string is intended for SEO. If you make a cool new thing then I blog about it I want to use your 128 bit string and you want me to use it too! So how do you prevent someone else from putting it on a linkfarm? I don't think trademark helps there.

If your page has 100 of these 128 bit strings in them then it's even clearer that its a link farm page that can be downranked