Nippon Telegraph and Telephone Corporation

Junichi Kishigami

Atsushi Nakadaira

Shigeru Fujimura

Akihito Akutsu

Hiroki Watanabe

Yasuhiko Miyazaki

Tomokazu Yamada

Shigenori Ohashi

Tatsuro Ishida

Kota Hidaka

Masayoshi Chikada

When an updated file that is an updated version of an original file is registered in a distributed file management system, a difference creation unitcreates a difference file between the original file and the updated file, a route object creation unitcreates a route object that includes an ID of the original file and an ID of the difference file, and a distributed file management clientcauses the difference file and the route object to be registered in the distributed file management system

Data update device, data update method, data update program, and data structure

A user terminal generates a first key pair and a second key pair, transmits a permission request including a public encryption key of the second key pair after electronically signing the permission request with a secret encryption key, and acquires, from permission information transmitted from a right-holder terminal, a content decryption key by using a secret decryption key of the second key pair and uses the content. The right-holder terminal stores a third key pair and the content decryption key, verifies the permission request received, and encrypts the content decryption key by using the public encryption key of the second key pair included in the permission request and transmits the permission information including the encrypted content decryption key after electronically signing the permission information with a secret encryption key of the third key pair. The permission request and the permission information are transmitted and received via a blockchain.

User terminal, permission information management method, and permission information management program

A settlement system includes a service provider devicewhich transmits a template information transaction including a template of a transaction to a networkof a first blockchain, a user device which transmits, to the networkof the first blockchain, a payment information transaction that includes an electronic signature generated by using the template of the transaction and a payment amount, and a smart contract, wherein the smart contractverifies the electronic signature by using the payment amount and the template of the transaction, the service provider devicegenerates a settlement transaction by using the template of the transaction, the electronic signature and the payment amount, and transmits the settlement transaction to a networkof a second blockchain, a plurality of output conditions are set to the template of the transaction, and the settlement transaction becomes usable when any one of the plurality of output conditions is satisfied.

Settlement system, settlement method, user device, and settlement program

Right holder terminal, permission information management method, and permission information management program

The blockchain generation apparatusincludes: a parameter calculatorthat identifies a parameter type to be used for linkage of the new block, based on block approval method data, and calculates a value for the identified parameter type based on transaction datasets which are related to an identifier of a generating party; a block generation condition checkerthat determines whether the generating party is qualified to generate the new blockchain data, based on the value calculated by the parameter calculator; and a blockchain generatorthat tries to generate the new blockchain by referring to the shared data when the block generation condition checkerdetermines that the generating party is qualified. An identifier of the blend pattern included in the block approval method dataspecifies a combination of the plurality of parameter types that conflict with each other.

Blockchain generation apparatus, blockchain verification apparatus, and program

Permission information management system, and permission information management method

Blockchain generation apparatus, blockchain generation method, blockchain verification apparatus, blockchain verification method, and program

The blockchain generation apparatusincludes: a synchronizerthat acquires shared datawhich includes the blockchain dataand transaction datasetsnot included in the blockchain data; a transaction pattern count calculatorthat calculates the number of transaction patterns for a generating party using the blockchain generation apparatus, based on the transaction datasets which are in the blockchain dataand are related to an identifier of the generating party; a block generation condition checkerthat determines whether the generating party is qualified to generate the new blockchain data, based on the number of transaction patterns calculated by the transaction pattern count calculator; and a blockchain generatorthat tries to generate the new blockchain by referring to the shared dataif the block generation condition checkerdetermines that the generating party is qualified.

Growing community of inventors

Muroran, Japan

Junichi Kishigami