Hitachi, Ltd.

Kaiho Fukuchi

Jun Nemoto

Masakuni Agetsuma

Mitsuo Hayasaka

Yasunori Hashimoto

Nishio Yamada

Tomokazu Sakai

Suguru Nagahora

A transaction has: lock release information; and a lock release condition. A first transaction has a record with a plurality of successive lock release conditions. A lock release condition of the first transaction includes public key information pertaining to an electronic signature different from the electronic signature of the issuer of the transaction. An asset/fund settlement device posts the first transaction in a ledger and determines executability of a second transaction issued after the first transaction by comparing, in accordance with the order of the plurality of successive lock release conditions, the lock release information and the lock release condition which have been posted in the ledger to lock release information and a lock release condition in a ledger of the second transaction. Thus, in a DvP transaction using electronic settlement, locked assets are safely returned, and deterioration in liquidity of assets/funds is avoided when the transaction is not established.

Electronic payment system and electronic payment method

The time required for recovery in a distributed computing system can be reduced. At least one node (for example a server) or a different computer (for example a management server) are provided in the distributed computing system which includes a plurality of nodes existing at a plurality of sites. One or more sites at which one or more nodes that hold one or more datasets identical to one or more datasets held by a node to be recovered are identified. For the recovery, it is determined, on the basis of the one or more identified sites, a restore destination site that is a site of a node to which the one or more identical datasets are to be restored from among the plurality of sites.

Method and system for recovering data in distributed computing system

A storage unit stores first data including the processing target information and second data including processing history information obtained by processing the processing target information based on a processing request; the first data and the second data include a plurality of data associated with different transactions; servers include a first server and a plurality of second servers; the plurality of second servers synchronize and hold the first data and the second data; and the first server that has received the processing request reads the first data of a processing target from a second server, processes the processing request, stores the second data including the processing history information and the first data reflecting a processing result in an own server, and transmits the second data configured to reflect the processing in the first data of the second server to the second server.

Data management method and data management system

Growing community of inventors

Tokyo, Japan

Kaiho Fukuchi