Although, there are indeed cases regarding illegal use of cryptocurrency, the proportion in illegal use of cryptocurrency determined from 2017 to 2020 is less than 1%. Illegal activities account for only about 2% - 4% of the total estimated value of economic activities. BAE Systems company pointed out in a report published in 2020 that "compared with the cases of money laundering through traditional methods, the identified cases of money laundering through cryptocurrency are still relatively few. “

In the case of the "Silk Road Dark Market", the transparent traceability of Bitcoin and its open blockchain ledger enabled law enforcement departments to identify and quickly arrest criminals. Since then, after decades of development, blockchain forensics and transaction monitoring have been provided by professional data companies through many cryptocurrencies, and the robustness and comprehensiveness of cryptocurrencies have also been constantly improving. For example, in the Twitter hacking incident in 2021, the blockchain forensics service enabled law enforcement departments to identify the perpetrator within two weeks and subsequently make arrests.