> If the government said “we’re now keeping a database of cash serial numbers that are hereby banned” would everyone need to install the “cash checker” app and

> If the government said “we’re now keeping a database of cash serial numbers that are hereby banned” would everyone need to install the “cash checker” app and scan each bill they receive? I recall something like that happening when I was younger. This was long ago, in the pre-Internet days, so unfortunately I haven't been able to find anything about it online; this is only my distant recollection. There was a theft of a large amount of new bank notes, which hadn't yet entered circulation. The government distributed a list of the ranges of bank notes (since the notes were newly printed, they were in large sequential ranges), and every cashier in the whole country (for instance, in supermarkets) had to check every note they received against that list; since the notes in question hadn't entered circulation yet, they could be treated as if they were counterfeit. (Since as far as I recall this happened back in the hyperinflation days, and the whole currency has been replaced one or more times since then, there is no longer any need to check against that list.)