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Re:Paper Money Diehards Refuse to Fold by lucumo on Monday May 29, 2023 @03:14PM (#36116990)
> each legitimate bill has a unique serial number, and yes, at least at present I haven't heard of private actors outside of those that service law enforcement tracking it

This isn't quite what you meant, but 20-ish years ago there was some crowd-tracking of Euro-bills.

The Euro was pretty new and people were excited about their banknotes showing up in other countries. Some people created a website where you could enter the serial number of your bills. Each serial number would have a tracking page in which places it showed up. It felt kinda cool to find a bill in your wallet that had visited a few other countries.

Re:Paper Money Diehards Refuse to Fold by tbrake on Monday May 29, 2023 @03:30PM (#36117138)
This reminded me https://www.wheresgeorge.com/ in the USA has been doing it a while as well. Had no idea it was still going strong all these years later.
Re:Paper Money Diehards Refuse to Fold by palsecam on Monday May 29, 2023 @03:33PM (#36117158)
Said website: https://EuroBillTracker.com/ Still operational!