I remember reading the book "The Sovereign Individual" which was written in the 90's. The authors argue that as the internet becomes more abundant, cybercurrencies will become popular and over time make it very hard for governments to collect taxes. This would in turn change the world in a lot of different ways.

Since I read the book, I have been waiting for someone to create something like this. It will be exciting to see if this will work and if "cyber currencies" will become more widely used.