When bitcoin is spent, remainders are re-encoded & combined - how do you separate out any ill-gotten gains from the legitimate hard-earned lucre? Outlining his team's solution: Professor Ross Anderson of the Computer Laboratory, University of Cambridge.

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Why Bitcoin isn't cash: Coming Soon
Elliptic Curve Backdoor:    • Elliptic Curve Back Door - Computerphile  

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: https://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran's Numberphile. More at http://www.bradyharan.com