Coincheck, a popular Japanese cryptocurrency exchange, confirmed on Friday that it has fallen victim to one of the biggest cryptocurrency hacks in digital currency history, a crypto heist that tops the notorious 2014 Mt. Gox incident.
During a late-night press conference, Coincheck president Wakata Koichi and Chief Operating Officer Yusuke Otsuka estimated the exchange had lost at least $400 million worth of the NEM cryptocurrency’s XEM tokens.
As a result, Coincheck has halted all operations and the price of XEM has tumbled nearly 10 percent at the time of writing. NEM is the tenth largest cryptocurrency according to CoinMarketCap.
Lax security measures protecting this smaller cryptocurrency seem to be at the root of this issue. Yuji Nakamura, a Bloomberg tech reporter based in Tokyo, attended the Coincheck press conference and tweeted the exchange was not using multi-signature — an additional layer of security for cryptocurrency transaction — for XEM transfers.
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