I get skeptical when I read "sustainable" so many times, it's like Klaus wrote it with all his implications attached. In spite of that, the tech is interesting, for sure. However, in spite of the data being safe for thousands of years, the ability to read it is not. As is often the case with agenda driven ideas, they fail to mention the weak link while conflating the benefits of certain aspects of the idea. Like "clean" EVs, the devil is in the details, like the pollution being upstream of the vehicle. This technology requires advanced optics and computer algorithms to be able to read it. How long before the mechanical reader breaks down or becomes obsolete? That is sure to occur in less than 50 years, at which point, that drink coaster sized glass becomes an actual drink coaster?