The Wall Street Journal: Hackers steal $70 million in bitcoin, prompt shutdown of cryptominer NiceHash

Nearly $70 million worth of bitcoin was stolen from a cryptocurrency-mining service called NiceHash following a security breach, causing the company to halt operations for at least 24 hours.

“Clearly, this is a matter of deep concern, and we are working hard to rectify the matter in the coming days,” NiceHash said in a statement on its Facebook page early Thursday Asia time.

Read: Bitcoin blasts through $15,000 milestone, soars 20% in 24 hours

Andrej P. Škraba, head of marketing at NiceHash, confirmed to The Wall Street Journal that approximately 4,700 bitcoin BTCUSD, +9.64%   had been stolen from a bitcoin wallet, an online account that stores the digital currency. Bitcoin wallets, like other online bank accounts, have been targets of hackers in the past.

“It was a professional attack,” Škraba said. He declined to elaborate further, saying more information will be revealed at a later date.

An expanded version of this report appears on WSJ.com.

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