A BLOCKCHAIN-BASED MEDICAL INSURANCE STORAGE SYSTEM

摘要

A communication program causing a first apparatus that is capable of acquiring information in a distributed ledger shared in a network to perform processes of: acquiring one or more digital certificates used by a user of a second apparatus to apply to the first apparatus from the second apparatus, acquiring type information that identifies a combination of the user and the type of information certified by the one or more digital certificates, by using the distributed ledger, acquiring certificate issue history that is recorded in the distributed ledger in association with the type information, and determining whether the issue history contains information of another digital certificate that has not been acquired from the second apparatus.