Comment by SilverRed

One thing to note is these are not typical cryptographic hashes because they have to be able to find recompressed/cropped/edited versions as well. Perhaps a hash is not an accurate way to describe it.

There have been a number of cases where people have found ways to trick CV programs in to seeing something that no human would ever see. If you were sufficiently malicious I imagine it would be possible to do with this system as well.