The private key of the BitBrowser browser user was suspected to be leaked, and many members of the encryption community reported that the private key was stolen. BitBrowser issued a notice, admitting that the cached data of the server may have been invaded, and the case has been reported. Users whose wallets have enabled extended data synchronization are at risk of being stolen. It is recommended to take immediate measures to transfer wallet assets. Cos, the founder of SlowMist, said on Twitter that the leakage of the private key of BitBrowser users has caused at least $520,000 in losses.