Among the other crypto-currencies, Bitcoin dropped 3.4% and Ripple retreated 9.9% on Friday, according to prices seen by the agency.
More was lost on Friday than in 2014, when MtGox lost what it thought was 850,000 bitcoins. However, MtGox later found 200.000 bitcoins in an old digital wallet.
“In a worst-case scenario, we may not be able to return clients’ assets,” an unnamed Coincheck representative was quoted as saying on Saturday by Japan’s Kyodo news agency.
After the collapse of MtGox shook the digital currency world, a licensing system was introduced in Japan to increase oversight of local currency exchanges such as Coincheck.
“What’s the lasting impact? It’s hard to tell,” Marc Ostwald, global strategist at ADM Investor Services International in London, told Bloomberg.
“Japan is one of the most pro-crypto trading countries, among the G-20. In Japan they don’t really want a wholesale clampdown. So it will be interesting how Japanese regulators respond to this, if they indeed do.”