Based on the digital certificate issued by the authoritative CA (Certificate Issuing Authority), and combined with blockchain and other technologies, the secure signing is in full compliance with the provisions of People's Republic of China (PRC) Civil Code, People's Republic of China (PRC) Electronic Signature Law and other laws, and is an effective proof of the user's implementation of civil legal acts. Through the API interface, the rest assured sign can quickly access the user's WeChat official account or applet, providing customers with one-stop signing service. Take the big data platform for employment in Guizhou as an example. After the introduction of electronic contracts, the labor and employment big data platform can initiate contract signing on the official WeChat account in batches. After employees enter the official WeChat account, they can find the contract to be signed by means of real-name registration system such as face recognition, and the signed contract will be automatically saved. Through real-name authentication, the employment platform can determine that the person signing the labor contract uses his own identity to replace others, correctly identify the real identity of temporary workers, and improve the standardization of employment. By applying high-security encrypted transmission, reliable electronic signature, reliable time stamp and other technologies, any modification of the electronic labor contract by both parties can be completely and truly recorded, and even if a labor dispute occurs, the truth can be restored through proof to safeguard legitimate interests.