Btw, their website shows an example of the digital code used on ballots. In this case it is a QR code. In other cases, I've seen states use barcodes.

This doesn't mean that the whole watermark/blockchain rumor is true. But, if anyone wanted to investigate what digital identifiers states actually use, that would probably get them closer to the right direction.

Editing to add one more comment. Good to know this glitched software is available in every swing state, including Virginia. If you download their brochure, you can see the things I am mentioning.