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It's the world's best-known digital currency, only exists as code on your hard drive, and last year it almost imploded amidst an apparent security breach at its biggest global exchange. But Bitcoin is far from dead yet. Retailers from Singapore to San Francisco are still embracing this controversial form of e-currency, which advocates say still offers a more democratic and less expensive means of doing business. Others say it is the currency of crooks. We hear the pros and the cons and from one expert who thinks that Bitcoin's future remains as bright as ever.