I believe the bitcoin is sent to a person's account on an exchange. Then, the person can take custody or sell it for fiat.
Interesting. I thought they had a hack, how are they going to cover everyones balance?
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It's a long story. You can start with wikipedia: https://en.wikipedia.org/wiki/Mt._Gox
This book has a good chapter about it:
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Okay, I will give it a look see.
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