The largest cryptocurrency hack ever recorded involved the theft of 127,426 BTC from Chinese mining pool LuBian in December 2020. The stolen Bitcoin was worth approximately $3.5 billion at the time and has since appreciated to an estimated $14.5 billion. The attackers exploited a weakness in LuBian’s private key generation algorithm, making their wallets susceptible to brute-force attacks. Despite LuBian's attempts to recover the funds, the hacker retains all stolen assets, ranking as the 13th largest Bitcoin holder. The incident highlights critical security vulnerabilities in cryptographic key management and wallet infrastructure.