The full name of the DAY agreement is Data Storage Traceability Contract, which is an ecological landing application plan built by the DAY Foundation. The world's leading new ecology of data storage and commodity traceability services created by many top blockchain technology and financial experts from around the world through "blockchain + intelligence" technology. The DAY protocol combines DeFi decentralized finance to reconstruct the economic model of the public chain, realizes the implementation of relevant commercial finance, and uses decentralized storage and traceability technology to realize the confirmation of user data and privacy protection. The DAY agreement is based on the drive of decentralized commercial finance, and uses the industrial landing as a booster to realize the close integration of the online digital economy and the real industry.