Data usage method, system, and program thereof employing blockchain network (BCN)

A method for enabling a user of a first information processing device to provide access to medical records of the user to a third- party information processing device associated with a third party, the medical records being stored in a storage device used by a second information processing device associated with a provider of medical services, the method comprising:

• providing, with the first information processing device of the user, a blockchain address associated with the user to the second information processing device associated with the provider of medical services, the blockchain address indicating a storage area on a blockchain network used by the first information processing device and the storage area being configured to facilitate a recording data using a distributed ledger;
• registering, with the second information processing device, access ticket data (ACT) for recordation in the distributed ledger in the storage area of the blockchain network at the blockchain address provided by the first information processing device, the access ticket data (ACT) including (i) a hash of the blockchain address associated with the user and (ii) a data resource identifier that is a pointer to a master record of the medical records of the user stored in the storage device, the master record being associated with a plurality of transaction records of the medical records of the user, each transaction record of the plurality of transaction records including medical data associated with the user and generated by the provider of medical services;
• receiving, with the first information processing device, a request for access to the medical records from the third party;
• retrieving, with the first information processing device, the access ticket data (ACT) from the storage area on the blockchain network used by the first information processing device and providing the access ticket data to the third-party information processing device associated with the third party;
• and
• accessing, with the third-party information processing device, the medical records of the user stored in the storage device used by the second information processing device by using the data resource identifier as the pointer to the master record of the medical records of the user stored in the storage device and then retrieving each transaction record of the plurality of transaction records associated with the master record, each transaction record including medical data associated with the user and generated by the provider of medical services.