Computations involved in mining Bitcoin are astronomical. Professor Phil Moriarty explains how estimating the energy useage is a Fermi problem.

The paper Phil refers to: http://bit.ly/C_BTC-Energy

Onion Routing (Tor): https://youtu.be/QRYzre4bf7I
Bitcoin Mining in 4 minutes: https://youtu.be/wTC31ZI6QM4

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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