Before revision: USD 1 banknote (Dollar bill) Currency bill tracking is the process (usually facilitated by any one of a number of websites set up for the purpose) of tracking the movements of banknotes, similar to how ornithologists track migrations of birds by ringing them.
After revision: USD 1 banknote (Dollar bill) Currency bill tracking is the process of tracking the movements of banknotes, similar to how ornithologists track migrations of birds by ringing them.