Abstract: Pieces of information on multiple file management systems are managed by one contract in a distributed ledger. An administrator terminal includes: a file management system generation unit that issues a contract generation transaction for generating, in blockchain data, a contract in which a network identifier that identifies a file management system is associated with an identifier of a participant terminal in a blockchain system, and notifying the participant terminal of the network identifier and an identifier of the contract; and a file management control unit that issues a registration transaction for registering, in the contract, connection information of the administrator terminal in the file management system, acquires connection information of the participant terminal in the file management system from the contract, and establishes a P2P connection with the participant terminal based on the acquired connection information.

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: Pieces of information on multiple file management systems are managed by one contract in a distributed ledger. An administrator terminal includes: a file management system generation unit that issues a contract generation transaction for generating, in blockchain data, a contract in which a network identifier that identifies a file management system is associated with an identifier of a participant terminal in a blockchain system, and notifying the participant terminal of the network identifier and an identifier of the contract; and a file management control unit that issues a registration transaction for registering, in the contract, connection information of the administrator terminal in the file management system, acquires connection information of the participant terminal in the file management system from the contract, and establishes a P2P connection with the participant terminal based on the acquired connection information.

Abstract: A settlement system includes a service provider device 2 which transmits a template information transaction including a template of a transaction to a network 4 of a first blockchain, a user device which transmits, to the network 4 of the first blockchain, a payment information transaction that includes an electronic signature generated by using the template of the transaction and a payment amount, and a smart contract 41, wherein the smart contract 41 verifies the electronic signature by using the payment amount and the template of the transaction, the service provider device 2 generates a settlement transaction by using the template of the transaction, the electronic signature and the payment amount, and transmits the settlement transaction to a network 3 of a second blockchain, a plurality of output conditions are set to the template of the transaction, and the settlement transaction becomes usable when any one of the plurality of output conditions is satisfied.

Abstract: The present invention prevents falsification of ABI information and makes it possible for the users to safely read data on a blockchain. A registration terminal 1 includes an extraction unit 142 that extracts from a smart contract, ABI information used to access the smart contract and a transaction issuing unit 13 that issues a transaction including bytecode generated by compiling the smart contract and the ABI information, and an approval terminal 2 includes a verification unit 152 that verifies whether it is possible to access the bytecode included in the transaction by using the ABI information included in the transaction and a block generation unit 154 that, if it is possible to access the bytecode, generates a block including the transaction and makes the block and the ABI information reflected on a distributed ledger 11 of each terminal in the blockchain system.

Abstract: A user terminal generates a first key pair and a second key pair, transmits a permission request including a public encryption key of the second key pair after electronically signing the permission request with a secret encryption key, and acquires, from permission information transmitted from a right-holder terminal, a content decryption key by using a secret decryption key of the second key pair and uses the content. The right-holder terminal stores a third key pair and the content decryption key, verifies the permission request received, and encrypts the content decryption key by using the public encryption key of the second key pair included in the permission request and transmits the permission information including the encrypted content decryption key after electronically signing the permission information with a secret encryption key of the third key pair. The permission request and the permission information are transmitted and received via a blockchain.

Abstract: Provided is a sound image localizing device, a sound image localizing method, and a program that enable a virtual speaker to reproduce sound in a wide frequency band with high sound quality. A sound image localizing device 10 includes a directivity control filter design unit 11 that computes a directivity control filter from a desired directional characteristic, a filter coefficient correction unit 12 that corrects the directivity control filter computed by the directivity control filter design unit 11, and a convolution operation unit 13 that computes an output acoustic signal by performing convolution of an input acoustic signal and the directivity control filter corrected by the filter coefficient correction unit 12.

Abstract: The scale of an apparatus that reproduces a sound field is reduced. A speaker array 1 includes a plurality of speakers arranged at intersections of a first plurality of virtual lines arranged parallel to each other at equal intervals and a second plurality of virtual lines that are perpendicular to the first plurality of virtual lines and are arranged parallel to each other at equal intervals, wherein multipoles of a given order are superimposed using the plurality of speakers to realize wave field synthesis.

Abstract: A signal processing device 1 includes an expansion coefficient calculation unit 11 that, from an outward sound field to be reproduced, calculates a spherical harmonics expansion coefficient for reproducing the sound field; an expansion coefficient conversion unit 12 that converts the calculated spherical harmonics expansion coefficient into a weight factor for superposition of multipole sources; a filter coefficient calculation unit 13 that, from the weight factor, calculates a filter coefficient corresponding to each speaker included in a multipole speaker array, the speaker providing output outwardly; and a convolution operation unit 14 that convolves the filter coefficient corresponding to each speaker into an input acoustic signal to calculate an output acoustic signal for each speaker.

Abstract: Pieces of information on multiple file management systems are managed by one contract in a distributed ledger. An administrator terminal includes: a file management system generation unit that issues a contract generation transaction for generating, in blockchain data, a contract in which a network identifier that identifies a file management system is associated with an identifier of a participant terminal in a blockchain system, and notifying the participant terminal of the network identifier and an identifier of the contract; and a file management control unit that issues a registration transaction for registering, in the contract, connection information of the administrator terminal in the file management system, acquires connection information of the participant terminal in the file management system from the contract, and establishes a P2P connection with the participant terminal based on the acquired connection information.

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 sound image localizing device includes a directivity control filter design unit that computes a directivity control filter from a desired directional characteristic, a filter coefficient correction unit that corrects the directivity control filter computed by the directivity control filter design unit, and a convolution operation unit that computes an output acoustic signal by performing convolution of an input acoustic signal and the directivity control filter corrected by the filter coefficient correction unit. Filters that respectively correspond to speakers constituting a speaker array are computed by the directivity control filter design unit and the filter coefficient correction unit, an acoustic beam is generated using directivity control by the speaker array, and the acoustic beam is caused to be reflected from a wall surface or a ceiling to generate a virtual sound source.

Abstract: A registration terminal according to an embodiment is a registration terminal which is connectable to a distributed ledger network, and includes: a token generation unit configured to generate a transaction related to generation of a token to the distributed ledger network and transmit the transaction to the distributed ledger network to generate the token in the distributed ledger network; and a registration unit configured to generate information in which access information to the token is set in a file to be processed, generate an identifier for the file to be processed, generate a transaction related to registration of the identifier to the token, and transmit the transaction to the distributed ledger network to register the identifier in the token.

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.

Abstract: An identifier change management apparatus according to an embodiment includes: a distributed ledger in which an identifier change program holding a public key and a first hash value; an identifier change key input unit that receives a secret key; a hash chain management unit that holds a seed value of a hash value used in the identifier change; a transaction issuing unit that issues an identifier change transaction including a signature value of an electronic signature that has been performed using the secret key and a second hash value generated using the seed value; and a program control management unit that changes the identifier, by the identifier change program, on condition that the signature value included in the identifier change transaction is verifiable by using the public key and a value obtained by applying a hash function to the second hash value becomes the first hash value.

Abstract: An identifier change management apparatus according to one embodiment includes: a key management unit configured to manage a group of private keys including a first private key; a message input unit configured to receive a message; a transaction issuing unit configured to issue an identifier change transaction including a hash value of the message and a first signature value generated from the first private key; a distributed ledger in which an identifier change program is registered, the identifier change program holding a pairing public key used when the identifier is changed and a second signature value; and a program control management unit configured to calculate a pairing signature value by the first and second signature values by the identifier change program and change the identifier on condition that the pairing signature value, the pairing public key, and the hash value satisfy an equation using a predetermined pairing function.

Abstract: An identifier change management apparatus according to an embodiment includes: a distributed ledger in which an identifier change program holding a public key used in an identifier change is registered; a distributed ledger management unit that manages the distributed ledger; an identifier change key input unit that receives a secret key used in the identifier change; a transaction issuing unit that issues an identifier change transaction including a signature value of an electronic signature that has been performed using the secret key; and a program control management unit that changes the identifier when the distributed ledger management unit receives the identifier change transaction, by the identifier change program, on condition that the signature value included in the identifier change transaction is verifiable by using the public key.

Abstract: A registration terminal according to the present embodiment is connectable to a first distributed ledger network and a second distributed ledger network. The registration terminal includes a registration unit, a first control unit, and a second control unit. The registration unit registers a file in an external storage service. The first control unit generates a registration transaction including a file identifier assigned to the file by the storage service and a verification key, and transmits the registration transaction to the first distributed ledger network. The second control unit generates a token transaction related to generation of a token and including a signature object message including the file identifier and a signature value obtained by digitally signing the signature object message with a signature key, and transmits the token transaction to the second distributed ledger network.

Abstract: An objective is to manage contract data registered in a distributed ledger with part of the contract data flexibly concealed without a centralized concealment server and without bothering the user with complicated procedures or the key management. A data registration method performed by a computer includes: generating a common key for encrypting and decrypting an item included in data that is registered in a distributed ledger; acquiring a public key for each account of a user having access authority to the item; encrypting the common key with the public key for each account; and registering the common key encrypted for each account in the distributed ledger via a transaction.