Adding some context to this, because it's a really interesting read that's worth the time if you ask me: it's about how some recently 'discovered' early playtest versions of Pokemon cards were found to be fake, or at least very suspicious, based on the presence (and decoding) of these dots.

I also find it interesting because the person who posted the discovery and breakdown of the dots stood to personally lose thousands of dollars they'd spent on the fakes, but posted their findings anyway.