I did a bit of more research, and found http://cypherpunks.venona.com/date/1997/02/msg01715.html http://cypherpunks.venona.com/date/1997/02/msg01715.html citing

I did a bit of more research, and found http://cypherpunks.venona.com/date/1997/02/msg01715.html http://cypherpunks.venona.com/date/1997/02/msg01715.html citing Le Roux on digital cash. (It's not him, by the way, found an active twitter account for that person. Just having some fun creating a conspiracy theory.)