Abstract: A data circulation support apparatus includes a memory and a processor configured to execute calculating a score indicating reliability of a contract condition related to circulation of data based on information indicating a sense of value related to contract compliance of each of a user of a circulation source of the data and a user of a circulation destination of the data, and to identifying a contract condition whose score is greater than or equal to a threshold; and recording the contract condition in a ledger upon receiving information indicating approval to the contract condition by the user of the circulation source or the circulation destination.

Abstract: A determination apparatus according to an embodiment includes: an input unit that inputs information indicating a first transaction action expected to be performed by a first user, information indicating a second transaction action expected to be performed by a second user, information regarding the first user, and information regarding the second user disclosed by the second user to the first user; an expected value calculation unit that calculates an expected value indicating reliability with which the second user performs the second transaction action when the first user performs the first transaction action by use of the information indicating the first transaction action, the information indicating the second transaction action, the information regarding the first user, and the information regarding the second user; and a feasibility determination unit that determines feasibility of a transaction contract represented by the first transaction action and the second transaction action by use of the expected

Abstract: A calculation apparatus according to an embodiment includes: an input unit that inputs information indicating a first action expected to be performed by a first user, information indicating a second action expected to be performed by a second user, information regarding the first user, information regarding the second user, and information indicating a relationship between the first user and the second user; and an expected value calculation unit that calculates an expected value indicating reliability with which the second user performs the second action when the first user performs the first action by using the information indicating the first action, the information indicating the second action, the information regarding the first user, the information regarding the second user, and the information indicating the relationship.

Abstract: A registration terminal according to an embodiment is a registration terminal connectable to a distributed ledger network, and includes a first generation unit that generates a private key for an identifier used for generation of an identifier of a file and a public key for an identifier used for generation of the identifier, a second generation unit that generates a transaction related to generation of management information to the distributed ledger network and transmits the transaction to the distributed ledger network to generate the management information to the distributed ledger network, and a third generation unit that generates an identifier of a processing target file as an identifier registered in the management information by using the public key for an identifier.