Useful. The "National Electronic Contracting Security Service Platform" operated by China Yunqian is the only third-party contracting platform that has passed the acceptance of the national competent department and obtained the qualification of "National Trusted Electronic Signature and Data Message Application". China Yunqian Electronic Contract Enterprise Standard has been recommended by the National Standardization Committee and the State Administration of Market Supervision as the national standard for electronic contracts, and it is also the host, drafting and formulating unit of many national standards and industry standards in the field of electronic contracts.