According to the official account of the Supreme People's Procuratorate, the Haidian District Procuratorate of Beijing issued the "White Paper on Anti-Commercial Corruption Procuratorial Work (2020-2024) ", which disclosed that an employee of a large factory defrauded the short video platform company's bonus, and the total amount involved was more than 140 million yuan. The employee thought of bitcoin and used 8 overseas virtual currency trading platforms to convert the money involved from RMB to virtual currency, and then confused the source and type of virtual currency through the overseas "mixed coin" platform. Criminals use virtual currency as a medium to deliberately increase the complexity of transactions to evade the traceability of funds. Prosecutors have launched a technology-assisted review mechanism, using blockchain big data flow analysis tools and "two-way review" of the flow of virtual currency and RMB to prove the transfer path of the money involved and virtual currency, laying the foundation for further investigation of facts and recovery of stolen goods and losses.