Zhimin Qian, also known as the "Bitcoin Queen," was convicted for her role in a fraudulent Bitcoin scheme that defrauded over 128,000 investors in China, resulting in the world's largest cryptocurrency seizure valued at £5.5 billion. The Metropolitan Police seized 61,000 Bitcoin during their investigation, making it the largest single cryptocurrency seizure in history. Qian attempted to launder the funds in the UK after fleeing China, leading to a multi-year investigation with international cooperation.