You should read up about Zerocoin here: http://blog.cryptographyengineering.com/2013/04/zerocoin-making-bitcoin-anonymous.html http://blog.cryptographyengineeri

You should read up about Zerocoin here: http://blog.cryptographyengineering.com/2013/04/zerocoin-making-bitcoin-anonymous.html http://blog.cryptographyengineering.com/2013/04/zerocoin-mak... It's going to be presented at the ieee conference next month.