It turned out that the stolen crypto assets were returned from hackers except for some due to the problem that crypto assets exchanged on the Internet were illegally leaked on a scale of over 60 billion yen due to a cyber attack.
On the 10th of this month, Poly Network, which provides crypto asset services, announced that crypto assets had been illegally leaked in the wake of a cyber attack, and asked hackers to return the stolen crypto assets.
By the 13th, Poly Network announced on Twitter that as a result of subsequent negotiations, the outflow of $ 610 million, or about 67 billion yen in Japanese yen, was returned, with some exceptions. did.
Several Western media have reported that the money was returned except for crypto assets of $ 33 million, or about 3 billion yen in Japanese yen, and the purpose of the hacker's theft was to enjoy it.
Poly-network is attracting users by providing a service called "decentralized finance" that allows you to exchange crypto assets.
Regarding cryptographic assets, in Japan as well, in 2018, cryptographic assets worth 58 billion yen were leaked from the exchange company Coincheck, and ensuring security is an issue.