Nippon Telegraph and Telephone Corporation

Yasuhiko Miyazaki

Atsushi Nakadaira

Shigeru Fujimura

Hiroki Watanabe

Akihito Akutsu

Junichi Kishigami

Tetsuro Tokunaga

Kiyoshi Tanaka

Mutsuhiro Nakashige

HIroki Watanabe

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

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

Methods, systems, and devices for leaving evidence of a contract on a blockchain with a simple method while having agreements made among the involved parties, maintaining the mode of one electronic signature per transaction, and maintaining credibility. Transactions of an issuing-party terminal, an agreeing-party terminal, and an agreeing-party terminal involved in contract agreement are linked as a chain, and the agreeing-party terminal at the end generates a transaction directed to the issuing-party terminal who has issued the contract. Each of these terminals previously generates a key pair for encryption of the contract and transmits the encryption key to a terminal which is its transaction sender. Then, this sender terminal encrypts a contract to be included in a transaction of the user of the sender terminal using the encryption key of the receiver of the transaction.

Contract agreement method, agreement verification method, contract agreement system, agreement verification device, contract agreement device, contract agreement program and agreement verification 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.

A content display device includes a content acquisition unit configured to acquire content data including a script, a storage unit configured to expand the content data into tree-structure data and store the tree-structure data, a determination unit configured to determine from the tree-structure data a sub-tree corresponding to a portion of the digital content to be displayed by each of the plurality of child browsers, and transmit the sub-tree to the corresponding child browser, an execution unit configured to execute the script, and an access unit configured to, when the execution unit executes a process to access the tree-structure data, notify the child browser holding a sub-tree to be accessed of the process and cause the child browser to execute a process, and configured to, when an occurrence notice of an event is received from the child browser, cause the execution unit to execute a process corresponding to the event.

Growing community of inventors

Yokosuka, Japan

Yasuhiko Miyazaki