Service providing equipment, service providing system, network system, service providing method, program, node and blockchain

摘要

PROBLEM TO BE SOLVED: To improve the convenience of a transaction between a service provider and a user. A service providing device 70 receives a transaction request for a transaction object (for example, an electronic book) provided by a service provider from a communication terminal 10, and provides a service for a request for changing the usage authority of the transaction object. It is transmitted to the blockchain 8 that stores the usage authority of the transaction object provided by the person. Then, the service providing device 70 provides the transaction object or the incidental data associated with the transaction object to the communication terminal 10 having the usage authority changed in response to the change request. [Selection diagram] Fig. 4