Bulletin board information management system

A bulletin board information management method executed by a node device configuring a peer-to-peer network, the bulletin board information management method comprising:

• receiving a first information registration request transaction that includes first information including a keyword on a product and bulletin board information representing an opinion of a customer on the product, an electronic signature signed on the first information with a private key of the customer, and a public key paired with the private key;
• and
• accumulating the first information registration request transaction into a blockchain based on a consensus building algorithm executed in cooperation with another node device configuring the peer-to-peer network.

A non-transitory computer-readable medium storing a computer program comprising instructions for causing a computer configuring a peer-to-peer network to execute a process to:

• receive, through the network interface, a first information registration request transaction that includes first information including a keyword on a product and bulletin board information representing an opinion of a customer on the product, an electronic signature signed on the first information with a private key of the customer, and a public key paired with the private key;
• and accumulate the first information registration request transaction into a blockchain based on a consensus building algorithm executed in cooperation with another node device configuring the peer-to-peer network.

12-13. (canceled)