TOKYO (AP) The frenzy surrounding bitcoin amped up further Thursday as the virtual currency soared above $15,000 for the first time, just days before it starts trading on major U.S. exchanges.
At the same time, there are fresh concerns about the security of bitcoin and other virtual currencies after NiceHash, a company that mines bitcoins on behalf of customers, said it is investigating a breach that may have resulted in the theft of bitcoin valued at about $70 million.
Research company Coindesk said that a wallet address referred to by NiceHash users indicates that about 4,700 bitcoins…

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