On the evening of January 3, the third debate of SheKnows's final debate at the end of the year began. The theme of this debate was "2020, the year when the public chain supervision broke the game." Zhang Ye, a partner of Wanshang Tianqin Law Firm, said that some people believe that China's policy is generally against currency. I don't quite agree. I propose four principles for the application of blockchain technology. The development and operation of blockchain projects must adhere to technology as the foundation, finance as the core, law as the guarantee, and application as the key. Taking finance as the core here, it does not mainly refer to payment, currency and other financial applications, but more importantly refers to the blockchain algorithm economic system based on the incentive mechanism, which essentially needs to follow the financial laws.