Toyota Jidosha Kabushiki Kaisha

Scalar Corporation

Wataru Fukatsu

Naoki Yamamuro

Shigeki Matsumoto

Yohei Nakanishi

Kazuya Kumazawa

A device includes: a storage storing a distributed ledger, the distributed ledger including a plurality of evidence chains and a time stamp chain, the plurality of evidence chains storing in chronological order at least one hash value, the time stamp chain storing in chronological order at least one time stamp token; and a processor configured to repeatedly execute an update process such that the time stamp chain is updated, the update process including a process for identifying, out of the evidence chains, at least one evidence chain in which the hash value has been changed with a change in the file since previous execution of the update process, and acquiring the time stamp token for a terminal value generated based on a terminal hash value of the at least one evidence chain.

Data management device, data management method, and non-transitory storage medium

When a second operation to simultaneously update component data Dto component data Dand update component data Dto component data Dis performed, a controller of a client server creates a record RAincluding a hash value of the component data Din a distributed ledger which is a first proof chain and creates a record RBincluding a hash value of the component data Din a distributed ledger which is a second proof chain. The controller generates a terminal hash value including a record hash value of the record RAand a record hash value of the record RBand obtains a time stamp token for the terminal hash value.

Data management apparatus and data management method

When a controller of a client server updates component data Dto component data D, the controller creates in a distributed ledger which is a first proof chain, a record (Age [3]) including a hash value of the component data D. Then, the controller generates a terminal hash value which is a hash value of a terminal record (Age [3]) in the first proof chain. The controller has the generated terminal hash value stored in a record in a distributed ledger which is a second proof chain, and associates the first proof chain and the second proof chain with each other.

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Tokyo, Japan

Wataru Fukatsu