As the real money can be stolen the same thing can happen with cryptocurrencies. During last year 30 million$ worth cryptocurrencies were stolen. That seems to be a lot but it is nothing comparing to recently discovered theft of virtuel money. Coin check-Japanese exchange for cryptocurrencies confirmed that from their platform were stolen cryptocurrencies worth 530 million dollars.
This cryptocurrencie is called NEM and due to allegations of Coin-chek it was stolen because it was kept in the hot wallet which is not as safe as cold wallet. Cold wallet is safer because it keeps your cryptocurrencies offline due to safety reasons and to avoid hackers to steal from you.
Coin check is the biggest cryptocurrencie exchange in Japan so this was a big shock for holders and investors in this country.