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

Claim 7:
8. A control system, comprising:
one or more IoT devices; and
a plurality of servers communicative with the one or more IoT devices via a network, wherein
a first server of the plurality of servers:
obtains first transaction data including operation notification information and time information from each of the one or more IoT devices, the operation notification information including identification information on the IoT device and a notification indicating that the IoT device is operating normally, the time information indicating a time when the IoT device has obtained the operation notification information;
transfers the first transaction data obtained, to a plurality of second servers that are the plurality of servers other than the first server;
executes, together with the plurality of second servers, a first consensus algorithm for an agreement on an authenticity of the first transaction data; and
records a block containing the first transaction data in a distributed ledger of the first server, when the authenticity of the first transaction data is verified by the first consensus algorithm, wherein

the control system further includes a terminal communicative with the plurality of servers via the network and used by a user, and
the first server further:
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.