Coincheck, a large cryptocurrency exchange in Japan said Friday that about 500 million NEM coins worth $400 million had been stolen. This is by far the biggest hack in the history of cryptocurrencies.
Before that the biggest hack was that of the Mt. Gox exchange in 2014, which resulted in the theft of $473 million in Bitcoin (Bitcoin). The hack eventually led to the bankruptcy of Mt. Gox, while investors never got their funds back