Abstract: A data verification apparatus (1) that verifies electronic data to be registered in a distributed ledger (5) includes a data verification unit (8), a data control unit (7), and a data registration unit (10). The data verification unit (8) determines whether or not registration data to be registered in the distributed ledger (5) complies with a verification rule which is a rule for verifying the electronic data to be registered in the distributed ledger (5). The data control unit (7) determines whether or not the data verification unit (8) has been generated in a blockchain. When it is determined that the data verification unit (8) has been generated in the blockchain and when it is determined that the registration data complies with the verification rule, the data registration unit (10) registers the registration data in the distributed ledger (5).

Abstract: A similarity calculation unit (213) treats each of a plurality of classifications as a target classification, and calculates a similarity between a reference feature value, which is a feature value extracted from image data of the target classification, and a recognition feature value, which is a feature value extracted from recognition target data, which is image data to be recognized. An influence calculation unit (214) calculates an influence on the similarity with regard to each partial image of the recognition target data by taking as input the similarity with regard to each of the classifications and the recognition feature value. A feature identification unit (215) changes the recognition feature value in accordance with the influence.

Abstract: A smart contract (800) includes a bond issuing unit (832) and a bond collecting unit (833). The bond issuing unit (832) determines whether or not a payment amount to be paid by an exchange floor, who is a buyer, to a user, who is a seller, can be paid with a deposit amount of a deposit wallet of the exchange floor, and if the payment amount cannot be paid, issues to the user, a bond equivalent to a currency amount which is at least a part of the payment amount, stores the currency amount of the bond in a bond wallet, and registers the user in a creditor list. When there is currency-putting-in into the deposit wallet of the exchange floor, as the currency-putting-in becomes a trigger, the bond collecting unit (833) selects a creditor registered in the creditor list, and compares a put-in-currency amount with the currency amount of the bond which is issued to the creditor.

Abstract: A similarity calculation unit (213) treats each of a plurality of classifications as a target classification, and calculates a similarity between a reference feature value, which is a feature value extracted from image data of the target classification, and a recognition feature value, which is a feature value extracted from recognition target data, which is image data to be recognized. An influence calculation unit (214) calculates an influence on the similarity with regard to each partial image of the recognition target data by taking as input the similarity with regard to each of the classifications and the recognition feature value. A feature identification unit (215) changes the recognition feature value in accordance with the influence.