F2Pool co-founder Wang Chun revealed a significant loss of 490 bitcoins during a security test of his private key. In a tweet, Wang Chun explained that he transferred 500 bitcoins to a suspicious address last year to verify if his private key had been compromised. The hacker took 490 bitcoins, leaving him with only 10 bitcoins. This incident was highlighted amid discussions of a recent $50 million USDT phishing attack.