There are a number of websites that track migrations of currency bills (just like ornithologists track migrations of birds by ringing them). All these sites can track currency among the users of that website. A user may register a bill by entering its serial number, and if someone else have already registered the bill, then the "route" of the bill can be displayed.

Some sites encourage marking before spending, others don't. This usually depends on the laws of the country issuing the currency.

Where's George is the first site to start this kind of activity. It was created by Hank Eskin. The site has inspired several other ones, see the list of external links.

Eurobilltracker was started on January 1st 2002 (and because of this the German site "Wo ist mein Geld?" stopped tracking).

External links