Abstract: A server acquires, from a terminal owned by a user, pairing information in which a user ID for identifying the user and a mobility ID for identifying a mobility used by the user are associated with each other; continuously acquires, from the terminal, terminal position information indicating a position of the terminal and associated with the user ID; specifies a user ID of a user using the mobility that is stopped, based on the pairing information; and determines, as position information of the mobility, the terminal position information associated with the user ID having been specified.

Abstract: A server device acquires location information indicating a location of a mobility, identification information on another mobility, the identification information being received from the other mobility by near field communication, and stop information indicating whether the mobility stops, from multiple mobilities; classifies two or more mobilities into a same mobility group, the two or more mobilities stopping and mutually receiving the identification information among the multiple mobilities; and specifies a stop place where the mobility group stops based on the location information on the two or more mobilities classified into the mobility group.

Abstract: A control method for an anomalous data sensing system including at least a plurality of authentication servers and including: sensing whether data obtained from a device is not anomalous; obtaining first transaction data including information indicating the data; verifying, by a first authentication server included in the plurality of authentication servers, the first transaction data obtained, when the data is sensed as not being anomalous; and recording a block including the first transaction data into a distributed ledger when an agreement about validity of the first transaction data is reached using a consensus algorithm.

Abstract: A control method for an anomalous data sensing system including at least a plurality of authentication servers and including: sensing whether data obtained from a device is not anomalous; obtaining first transaction data including information indicating the data; verifying, by a first authentication server included in the plurality of authentication servers, the first transaction data obtained, when the data is sensed as not being anomalous; and recording a block including the first transaction data into a distributed ledger when an agreement about validity of the first transaction data is reached using a consensus algorithm.

Abstract: A control method to be performed by a first mobile node disconnected from a mobile line among a plurality of mobile nodes each being connectable to the mobile line includes: transmitting and receiving a mobile line connection status to and from each of one or more second mobile nodes via near-field wireless communication; building a MANET with the one or more second mobile nodes based on a first mobile line connection status of the first mobile node and a second mobile line connection status of each of the one or more second mobile nodes; generating, after the building of the MANET, first transaction data including at least first MANET routing information that indicates the MANET connection status of the first mobile node; and recording a block including the first transaction data into a first distributed ledger that is used for a blockchain in the MANET.

Abstract: A method includes: recording provision record information in which provider identification information which identifies a data provider, data identification information which identifies each of one or more items of provided data generated by a home appliance, and value reference information which serves as a reference for calculating a data value of each of the one or more items of provided data are associated with one another; and when the one or more items of provided data include used data that is data used by a data user, determining an incentive for the data provider of the used data based on the provision record information. The value reference information includes an index value determined by each of a plurality of value indexes.

Abstract: A control method that is performed by a device in a distributed ledger system including a plurality of nodes each holding a distributed ledger includes: obtaining transaction data to be stored into the distributed ledger; obtaining a security level of each of the plurality of nodes; and preferentially determining a node having a higher security level among the plurality of nodes as a destination node for the transaction data.

Abstract: A service server generates a first smart contract programmed to be capable of executing provision of an incentive to a user when a goal indicated by generated challenge content generated is achieved, generates first transaction data including the first smart contract, and transmits the data to a first authentication server. The first authentication server executes a consensus algorithm and records the first transaction data in a distributed ledger to run the first smart contract. The first authentication server notifies a device used by the user of the challenge content. The first authentication server obtains, from the device, second transaction data including first challenge content selected to be registered by the user, and records the second transaction data in the distributed ledger by executing a consensus algorithm.

Abstract: A method includes: transmitting, to a second device used by a second user, identification information of a smart contract including a process of providing content according to a provision condition under which a first user allows to provide the content, through short-range wireless communication; receiving transaction data including identification information of the second device and instruction information for instructing to execute the smart contract, through short-range wireless communication; and storing the transaction data received in a distributed ledger and executing the smart contract, to change an owner of the content from the first user to the second user.

Abstract: A method includes: recording provision record information in which provider identification information which identifies a data provider, data identification information which identifies each of one or more items of provided data generated by a home appliance, and value reference information which serves as a reference for calculating a data value of each of the one or more items of provided data are associated with one another; and when the one or more items of provided data include used data that is data used by a data user, determining an incentive for the data provider of the used data based on the provision record information. The value reference information includes an index value determined by each of a plurality of value indexes.

Abstract: A control method to be executed by a first device includes: receiving identification information identifying a second device from the second device by near-field communication; determining an evaluation value indicating appropriateness of the processing executed by the second device, with reference to a storage device that stores history information indicating processing executed by the second device; and restricting the near-field communication with the second device, based on the evaluation value determined.

Abstract: A control method according to the present disclosure is a method for controlling a first terminal carried by a first user and capable of communicating with a server via a network and includes: establishing short-range wireless communication by the first terminal with a second terminal carried by a second user; requesting the second terminal by the first terminal via the short-range wireless communication to provide item information, which is information related to at least one item included in one or more items worn by the second user, or requesting the server by the first terminal via the network to provide the item information, using identification information of at least one item that has been obtained upon the establishment of the short-range wireless communication; obtaining the item information by the first terminal; and transmitting, to the server, item positive-obtainment information indicating that the item information has been obtained.

Abstract: A server acquires, from a terminal owned by a user, pairing information in which a user ID for identifying the user and a mobility ID for identifying a mobility used by the user are associated with each other; continuously acquires, from the terminal, terminal position information indicating a position of the terminal and associated with the user ID; specifies a user ID of a user using the mobility that is stopped, based on the pairing information; and determines, as position information of the mobility, the terminal position information associated with the user ID having been specified.

Abstract: A server device acquires location information indicating a location of a mobility, identification information on another mobility, the identification information being received from the other mobility by near field communication, and stop information indicating whether the mobility stops, from multiple mobilities; classifies two or more mobilities into a same mobility group, the two or more mobilities stopping and mutually receiving the identification information among the multiple mobilities; and specifies a stop place where the mobility group stops based on the location information on the two or more mobilities classified into the mobility group.

Abstract: This control method, etc., are a control method for an anomalous data sensing system including at least a plurality of authentication servers and include: sensing whether data obtained from a device is not anomalous; obtaining first transaction data including information indicating the data; verifying, by a first authentication server included in the plurality of authentication servers, the first transaction data obtained, when the data is sensed as not being anomalous; and recording a block including the first transaction data into a distributed ledger when an agreement about validity of the first transaction data is reached using a consensus algorithm.

Abstract: A control method to be performed by a first mobile node disconnected from a mobile line among a plurality of mobile nodes each being connectable to the mobile line includes: transmitting and receiving a mobile line connection status to and from each of one or more second mobile nodes via near-field wireless communication; building a MANET with the one or more second mobile nodes based on a first mobile line connection status of the first mobile node and a second mobile line connection status of each of the one or more second mobile nodes; generating, after the building of the MANET, first transaction data including at least first MANET routing information that indicates the MANET connection status of the first mobile node; and recording a block including the first transaction data into a first distributed ledger that is used for a blockchain in the MANET.

Abstract: A control method according to the present disclosure is to be executed by a system including a distributed ledger storing a smart contract obtained by programming, in an executable manner, a determination on a medical treatment made as a result of a discussion between a patient and a physician. The control method includes: obtaining condition transaction data including biological information on the patient obtained by a sensor; obtaining opinion transaction data including information on a result of a diagnosis by the physician based on the biological information; executing the smart contract based on the biological information and the result of the diagnosis included in the condition transaction data and the opinion transaction data obtained, respectively; and outputting medical suggestion information indicating a medical treatment to be given to the patient, and obtained by executing the smart contract.