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.

Some of the websites for bill tracking:

• Where's George? is the first site to start this kind of activity. It was created by Hank Eskin to track US dollars. The site has inspired several other ones, see the list of external links.
• Canadian Money Tracker, started in 1999, for CAD (Canada)
• Where's Willy for CAD (Canada)
• WhereHaveIBeen.com for Canadian and American currency
• Eurobilltracker was started on January 1st 2002 to track Euros(and because of this the German site "Wo ist mein Geld?" stopped tracking).

The act of tracking a $20 bill was the binding theme between various stories in the film Twenty Bucks.

A similar scheme is BookCrossing, which tracks the movement of secondhand books which are marked and then "released into the wild".

See Also:Bookcrossing, Geocaching, Letterboxing,

External links

• "Where's George?" -- Tracking US dollar bills
• "Where's Willy?" -- Tracking Canadian dollar bills
• Canadian Money Tracker
• Dosh Tracker -- United Kingdom
• SEK Tracker -- Sweden
• Denmark
• Osatsu (i.e., bill) Japan
• Eurobilltracker Tracking Euro bills
• WhereAreMyEuros.com Tracking Euros incl. photo-upload
• "Wo ist mein Geld?" German, stopped
• Where Have I Been? Canadian & US bills
• Sek Tracker - SEK
• Swiss Franc Tracker - CHF