On July 15th, Japanese economist Noguchi Yukio commented on Facebook's cryptocurrency Libra: 1. Whether Libra is credible or not depends on whether its basic blockchain is reliable. This is also the fundamental difference between cryptocurrency based on blockchain and electronic money and traditional currency. 2. The danger of Libra being used for money laundering cannot be denied. But the danger of money laundering also exists in bank deposits or central bank vouchers. If Libra is banned on the grounds of money laundering, there is a lack of consistency in not disabling bank deposits and central bank notes. 3. Parliament and the central bank want to kill Libra because of the potential real challenges to the national management system.