Last week’s sharp, 30% plunge in the price of bitcoin (and its latest competitor, ether), after news hit that 119,756 bitcoins, or about $70 million, had been stolen from the Hong Kong-based bitcoin exchange Bitfinex, demonstrated once again the biggest risk with digital currencies: despite claims to the contrary, outside hacks remain a key threat and risk to anyone holding (obviously, we use the term loosely) digital currencies.

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