SAC (Sports Athletic Chain) is built on blockchain technology, designed to create a fair, convenient, efficient, and secure new business ecosystem for the sports finance sector. At its core, SAC is a virtual asset management sidechain based on blockchain technology that will form a Sports Chain Alliance, significantly lowering the barrier to entry for developers, users, businesses, and the entire blockchain ecosystem when using blockchain technologies. The SAC community applies to step-counting mining, marketplaces, trading, social networking, finance, DApp ecosystem incubation and incentives, developer community building, commercial and industry collaborations, marketing, academic research, education investment, legal frameworks, and various institutional investments; all of which will enable more companies, users, and nodes to join the SAC ecosystem at a low cost and with minimal thresholds, benefiting from the rewards of blockchain industry growth.