Tacos, doughnuts, guns: At SXSW, bitcoins buy it all

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It’s been a tumultuous month for the virtual currency bitcoin. Last week, Newsweek Magazine ran a cover story unmasking Bitcoin’s founder, Satoshi Nakamoto, only to have the subject of the article deny he’s the guy. And Mount Gox, formerly one of the largest bitcoin exchanges in the world, filed for US Bankruptcy Protection after losing millions of dollars worth of bitcoin.