Patent ID: 11876913
Assignee: PANASONIC INTELLECTUAL PROPERTY CORPORATION OF AMERICA
Field: Digital communication (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 9:
10. A data structure used for a block to be recorded in a distributed ledger, in a system including one or more IoT devices and a plurality of servers communicative with the one or more IoT devices via a network, the data structure comprising:
first transaction data including operation notification information and time information, the operation notification information including identification information on each of the one or more IoT devices and a notification indicating that the IoT device is operating normally, the time information indicating a time of obtaining the operation notification information, wherein
the first transaction data is obtained by a first server of the plurality of servers through execution of a smart contract stored in the distributed ledger,
the first transaction data obtained is contained in the block so as to be recorded in the distributed ledger,
the system further includes a terminal communicative with the plurality of servers via the network and used by a user, and
the first server:
reads out status information indicating whether each of the one or more IoT devices is available based on whether the operation notification information has been obtained within a predetermined time, when a user request by the user inquiring whether an IoT device of the one or more IoT devices is available is received from the terminal; and
sends, to the terminal, a first signal indicating that the IoT device is permitted for use under a predetermined condition, when the IoT device is determined to be available based on the status information read out.