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Anonymity in Bitcoin

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Cryptocurrency Cabal
http://www.bitcoin-class.org
University of Virginia Fall 2015

Published in: Law
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Anonymity in Bitcoin

  1. 1. Class 19: Anonymity in Bitcoin Cryptocurrency Cabal cs4501 Fall 2015 David Evans and Samee Zahur University of Virginia
  2. 2. What is anonymity? anonymous pseudonymous unlinkable 1
  3. 3. Unlinkability of Bitcoin Transactions 2 If Alice conducts two bitcoin transactions using different bitcoin addresses (“pseudonyms”), how hard is it for those transactions to be linked?
  4. 4. Linking Transactions 3 https://blockchain.info/tx/0197dabc3c31c8221b5d7883a9d03240bcf7a3042e1bf6dcc26c8d3aa60c58ab
  5. 5. Confounding Transaction Tracers 4 "CoinJoinExample" by MARIODOESBREAKFAST - Image drawn for CoinJoin article. Licensed under CC BY-SA 3.0 via Wikipedia - https://en.wikipedia.org/wiki/File:CoinJoinExample.svg#/media/File:CoinJoin Example.svg
  6. 6. Mixers 5
  7. 7. Mixer Design 6
  8. 8. 7
  9. 9. Silk Road 8
  10. 10. 9
  11. 11. 10 Illegal drugs are illegal and can rot your brain and destroy your (and others) lives!
  12. 12. 11 This is current! https://www.linkedin.com/in/rossulbricht My goal during this period of my life was simply to expand the frontier of human knowledge. Now, my goals have shifted. I want to use economic theory as a means to abolish the use of coercion and agression amongst mankind. … To that end, I am creating an economic simulation to give people a first-hand experience of what it would be like to live in a world without the systemic use of force.
  13. 13. Silk Road Transactions 12
  14. 14. 13
  15. 15. 14
  16. 16. 15
  17. 17. 16
  18. 18. 17
  19. 19. 18
  20. 20. Threats to Validity 19
  21. 21. 20
  22. 22. Communication Privacy 21
  23. 23. 22 USENIX Security 2004
  24. 24. Onion Routing 23
  25. 25. 24
  26. 26. Charge Problem Set 3 due Sunday Upcoming office hours: Today: 5-6:30pm (Ori, Rice 442) Wednesday: 3:30-4:30pm (Samee, Rice 442) Thursday: 2:30-3:30pm (Dave, Rice 507) 25

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