ADMINISTRATOR TERMINAL, PARTICIPANT TERMINAL, RIGHT HOLDER TERMINAL, USER TERMINAL, CONTENT UTILIZATION SYSTEM, ADMINISTRATOR PROGRAM, PARTICIPANT PROGRAM, RIGHT HOLDER PROGRAM, USER PROGRAM, AND DATA STRUCTURE OF STATE DATA

摘要

The present invention manages information on a plurality of file management systems using one contract of a distributed ledger. An administrator terminal 1 is provided with a file management system generation unit 122 and a file management control unit 123. The file management system generation unit 122 issues a contract generation transaction which: generates in block chain data B a contract which corresponds to a network identifier identifying a file management system 9 and which associates an identifier of a participant terminal 10 in a block chain system 6; and notifiies the participant terminal 10 of the network identifier and a contract identifier. The file management control unit 123 issues a registration transaction that registers connection information of the administrator terminal 1 in the file management system 9 in the contract, acquires from the contract connection information of the participant terminal 10 in the file management system 9, and establishes a P2P connection with the participant terminal 10 on the basis of the acquired connection information.