[forgotmypw]

Fingerprints are not necessarily hashes, they can also be done as a collection of datapoints that combine into a probability. Here is a POC of this type of technique:

https://github.com/gulkily/browserfp

[Izkata]

The EFF has a working one that tells you the uniqueness of your browser and how it got that score: https://panopticlick.eff.org/