BLOCKCHAIN SYSTEM, REGISTRATION DEVICE, DEGREE OF CONTRIBUTION COMPUTATION DEVICE, DEGREE OF CONTRIBUTION COMPUTATION METHOD, AND DEGREE OF CONTRIBUTION COMPUTATION PROGRAM

摘要

An objective of the present invention is to compute a degree of contribution of content corresponding to a content purchase situation. Provided is a blockchain system comprising a registration device 1 and a degree of contribution computation device 2. The registration device 1 comprises: an acquisition unit 15 which acquires content purchase information; and a transaction issuance unit 13 which, on the basis of the content purchase information, issues a transaction which includes a purchaser ID and a content ID. The degree of contribution computation device 2 comprises: a history acquisition unit 24 which acquires, from a distributed ledger in which the transaction is reflected, history information in which a purchaser having the purchaser ID has purchased content of a different type which is associated with the content ID; and a degree of contribution computation unit 25 which, using the history information, computes a degree of contribution of the content corresponding to a purchase sequence of the content which is associated with the content ID.