This is cool, though as said in the other comments, it's unfortunate that the readability of the codes are tied to the availability of the service, like a URL shortener, i.e., not very mesh.

Did you do much research onto the actual "serialization format" of the tags? Aesthetically they are nice, but I wonder how deep the rabbit hole goes for drawable-but-not-necessarily-human-readable dense formats, which is a slightly different utility function than regular written languages. I imagine there's some overlap with the psychology of memorizing passwords which are opaque semantically, but still need to be remembered.