1-Abstract:Data format requirements for blockchain systems are established in this standard. This standard addresses data structures, data types, and data elements. 2-Scope:This standard establishes data format requirements for blockchain systems. This standard addresses data structures, data types, and data elements. 3-Purpose:This standard provides data format reference for organizations planning to use blockchain technology for constructing blockchain systems, while guiding blockchain service organizations on building data structures in blockchain system(s), and provides references about data formats for middleware service organizations during constructing blockchain systems(s).