Paris (AFP) – US officials announced on Tuesday they had recovered $3.6 billion of bitcoin stolen in a 2016, throwing a light on the scams that surround cryptocurrency. But how exactly do criminals steal in the virtual world? Hacking the exchangesBitcoin and other cryptocurrencies are bought, sold and stored on exchanges, just like commodities in the non-virtual world. But crypto investors, and those who organise exchanges, often object to centralised control and reject stringent oversight — and that sometimes leads to lax security. “Exchange sites have stocks that are relatively large at any…

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