TechFlame reports that, according to Arkham, LuBian, the world's top ten mining pool, experienced a major security incident in December 2020. A total of 127,426 BTC were stolen, worth 14.5 billion US dollars at current currency prices, making it the largest Bitcoin theft in history. According to Arkham, LuBian used to be a Chinese mining pool and had mining sites in China and Iran. It controlled nearly 6% of the Bitcoin network's network-wide computing power in May 2020, and has significant industry influence. The attack occurred on December 28, 2020. The attackers suspected that their private key generation algorithm had a flaw and successfully stole more than 90% of the positions through violent cracking. The next day (December 29), the hackers transferred part of the BTC again, amounting to $6 million. Additionally, LuBian tried to appeal to the hacker through the OP_RETURN information on the chain to request the return of stolen assets. Officials sent a total of 1,516 transactions with messages, which cost a total of 1.4 BTC, further confirming that the incident was not a fake act. Currently, LuBian still holds 11,886 BTC (about $1.35 billion), and the hacker's last on-chain action was an address consolidation in July 2024. As of the disclosure date, the hacker is still in control of the stolen BTC. The identity is unknown. His holdings already rank among the 13th largest BTC holders in the world, even surpassing the Mt.Gox hacker address.