An application programming interface (API) collection and data transmission format between the chain layer and the application layer in a blockchain system is defined by this standard and the string, encoding, and request-response format of the API is standardized.

The standard defines an application programming interface (API) collection and data transmission format between the chain layer and the application layer in a blockchain system and standardizes the string, encoding, and request-response format of the API. The standard specifies intrusion prevention, malicious code prevention, trusted execution of programs, data integrity, data confidentiality, access control, and management systems (note that optional interfaces are included in Annex A).