You don't need to be able to tell them apart to value one at $15,000 and another at $15.

Hand-injected and machine-injected history of a given bubble may not be a distinguishable property within the natural universe, but it's important to art collectors, in a similar way that the copyrighted or not-copyrighted status of bits gives them an invisible color to lawyers: https://ansuz.sooke.bc.ca/entry/23