There are different kinds of geocoins. The main ones are:
USA GeoCoins (sold by Geocaching.com) that usually hace a 5 digit number and are tracked in Geocaching.com just like "regular" travel bugs. They also show up on your Geocaching.com statistics.
Canadian GeoCoins (sold by www.geocoins.ca ) have a 4 digit number and have to be tracked exclusively at www.geocoins.ca.
There are other types as well.