On Bloomberg view, Matt Levine discusses the recent bitcoin fork. The handling of long and short positions on Bitfinex, a bitcoin exchange, created an arbitrage opportunity, until Bitfinex changed its mind. Bitfinex announced a policy to deal with the fork, people took advantage of the policy, and Bitfinex changed its mind after the fact. Each of its decisions was rational, and quite plausibly the fairest option available to it. None of those decisions were required by, like, the nature...
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