Arkham Intelligence has uncovered a massive theft of 127,426 BTC (worth nearly $14.5 billion today) from Chinese Bitcoin mining pool LuBian in December 2020. At the time, it was the largest crypto theft by value. LuBian, once the sixth-largest mining pool, vanished in February 2021. Arkham attributes the hack to a vulnerability in LuBian’s private key generation algorithm, which allowed over 90% of their BTC to be stolen. As of now, the stolen BTC remains unmoved, and LuBian had previously sent messages via Bitcoin’s OP_RETURN to request the return of the funds.

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https://x.com/arkham/status/1951729790299394113