This is from 1999, an interview with Nobel Laureate Milton Friedman conducted by NTU/F. http://youtu.be/mlwxdyLnMXM
"The one thing that's missing, but that will soon be developed, it's a reliable e-cash. A method where buying on the internet you can transfer funds from A to B, without A knowing B or B knowing A. The way in wich I can take a 20 dollar bill and hand it over to you and there's no record of where it came from. And you may get that without knowing who I am. That kind of thing will develop on the Internet."