Distributed ledger system, information processing terminal device, and program

Abstract

To provide a distributed ledger system and the like allowing a personal data (viewing data) providing side to trace a usage history of the personal data by a business operator or the like.SOLUTION: A management node device constituting a distributed ledger system includes a ledger recording unit, a ledger referencing unit, and a referencing history inquiry unit. The ledger recording unit registers viewing data transmitted from a registering side information processing terminal device to the distributed ledger. The ledger referencing unit transmits, on the basis of a referencing request from an external referencing side information processing terminal device, the viewing data to the referencing side information processing terminal device, and registers a referencing history being history information of referencing to the viewing data to the distributed ledger. In response to the inquiry from the registering side information processing terminal device, the referencing history inquiry unit searches a registered referencing history, and transmits the referencing history obtained as a search result to the registering side information processing terminal device.SELECTED DRAWING: Figure 1

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