For all students:
As discussed in class, digital cash has important implications to the monetary system. That is discussed here:
Digital Cash and Monetary Freedom
Here is a useful tutorial on digital cash and electronic commerce:
Scaleable, Secure Cash Payment for WWW Resources with the PayMe Protocol Set
Optional:
This site has many interesting links:
Money and Payment Systems
Here is an emerging standard for electronic transactions:
Secure Electronics Transactions (SET) specifications