The size of the Coincheck shows how vulnerable investors remain in this nascent field, despite numerous efforts by regulators to reduce the risk of cyberattacks. Unlike keeping cash in major banks or investing in stock markets, price moves are far from the only risk when investors put money in cryptocurrency markets.

https://www.wsj.com/articles/cryptocurrency-worth-530-million-missing-from-japanese-exchange-1516988190?mod=searchresults&page=1&pos=1