On the crypto topic that everyone loves to hate, Bitcoin, the expected attack has begun.

http://financialcryptography.com/mt/archives/001363.html

Philipp Guering and I wrote a paper that explains how this will fall out.

http://iang.org/papers/BitcoinBreachesGreshamsLaw.pdf

Although in the big picture, this is more about finance not cryptography, there is an engaging question - can cryptography be used to control this sort of issue? It didn't work for Bitcoin, but more judicious uses of crypto can do a lot better, and has done with other designs. The challenge is to get the balance right.

iang
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