Abstract: A secret key needed for access to a wallet or data movement is managed in a non-centralized manner. A distributed ledger data management system 10 includes a blockchain distributed ledger system (an asset management distributed ledger 11) which is configured to have a plurality of distributed ledger nodes (asset management distributed ledger nodes 22) and a distributed ledger network (an asset management distributed ledger network 21), and a plurality of utilization group systems which each manage, as a corresponding one of respective clients for a plurality of utilization groups for individuals and organizations participating in the distributed ledger system, a wallet of the utilization group for the individual or the organization. The utilization group system for the organization (a system for a utilization group 13) issues a transaction to the distributed ledger system by using an encrypted secret key of the organization when the wallet of the organization is used.

Abstract: A transaction management apparatus, which is a queuing server configured to execute processing of holding a history of transactions between a WEB server (client) and a distributed ledger server in a blockchain system, processing of identifying a transaction updating a sane key based on the history and saving the transaction to a queue, and processing of transmitting the transaction after an elapse of a prescribed time period in which the same key is not updated in the same block.

Abstract: In a transaction management system which is a distributed ledger system in which a business network is formed of a plurality of nodes, the node calculates an upper limit of the number of transactions that can be issued by each of a plurality of organizations according to a calculation rule shared among the nodes, and refuses to accept the transaction from an organization of the organizations of which the number of transactions in past exceeds the upper limit of the number of transactions.

Abstract: A distributed ledger management method performed by each of nodes 211 configuring a distributed ledger system, includes: holding, in an end block 102, signatures of respective organizations operating the respective nodes, hash values of respective groups of blocks into which a blockchain 215 is divided by a number of the operating organizations, information on organizations by which the group of blocks is to be held, and a verification frequency for the hash value between the organizations; specifying a group of blocks to be held by the organization; deleting a block other than the group of blocks in the blockchain 215; and performing a tamper verification of requesting a node 211 of another organization to transmit the hash value of the group of blocks to be held by the other organization at a verification frequency, and collating the hash value with the hash value included in the end block 102.

Abstract: A distributed ledger management system 10 includes: an orderer node 100 that generates a block containing transactions issued by a client 300, verifies the validity of the transactions contained in the block, distributes the block and verification results to a peer node 200, adds the block to a blockchain 125 in its storage device, and stores the verification results in its storage device; and the peer node 200 that receives the block and verification results from the orderer node 100, adds information on predetermined events indicated by the transactions to state information 225 in a storage device of the peer node, and discards the block and verification results.

Abstract: A distributed ledger management method implemented by a predetermined management node configured to perform processing, includes: building a distributed ledger node for endorsement in restoration of a distributed ledger system or addition of a distributed ledger node (304); giving a state database copied from an existing node to the distributed ledger node for endorsement to perform the endorsement (305) and setting the distributed ledger node for endorsement as a broadcast destination of a transaction (306); and monitoring a status of block recalculation that is based on a block at a certain time point and that is performed in a normal distributed ledger node for the restoration or the addition (307, 308) and changing the broadcast destination of the transaction to the normal distributed ledger node (310) when calculation of a latest block is detected (309).

Abstract: A composite particle comprising: a core particle containing at least one type of polymer; and micronized cellulose that has an anionic functional group, is inseparably bonded to the core particle, and is disposed on a surface of the core particle, wherein an organic onium cation or an ammonium ion is bonded to at least a part of the micronized cellulose.

Abstract: A distributed ledger management system 10 includes: an orderer node 100 that generates a block containing transactions issued by a client 300, verifies the validity of the transactions contained in the block, distributes the block and verification results to a peer node 200, adds the block to a blockchain 125 in its storage device, and stores the verification results in its storage device; and the peer node 200 that receives the block and verification results from the orderer node 100, adds information on predetermined events indicated by the transactions to state information 225 in a storage device of the peer node, and discards the block and verification results.

Abstract: A migration support system 10 includes a node of a first distributed ledger system built on a blockchain platform 4500, wherein the node 2000 includes: a storage device that holds information on organizations that are allowed to participate in a distributed ledger system on each of blockchain platforms; and a computing device configured to, when the first distributed ledger system is migrated to another blockchain platform to build a second distributed ledger system, record, in a distributed ledger 2500 of the first distributed ledger system, correspondence between organizations participating in the first distributed ledger system and organizations participating in the second distributed ledger system, based on information on organizations that are allowed to participate in each distributed ledger system on the blockchain platform and the other blockchain platform, the information being held in the storage device.

Abstract: What is provided is a method for producing a composite-particle composition including a first step of obtaining a dispersion liquid of fine fibers; a second step of coating a surface of liquid droplets of a polymerizable monomer or a polymer with the fine fibers in the dispersion liquid to stabilize the liquid droplets as an emulsion; a third step of polymerizing the liquid droplets of the polymerizable monomer or the polymer to obtain composite particles including the polymer coated with the fine fibers; and a fourth step of adsorbing a compound that forms an ionic bond in a pair with an ionic functional group of the fine fibers onto the fine fibers in the surface of the composite particles.

Abstract: A distributed ledger management method performed by each of nodes 211 configuring a distributed ledger system, includes: holding, in an end block 102, signatures of respective organizations operating the respective nodes, hash values of respective groups of blocks into which a blockchain 215 is divided by a number of the operating organizations, information on organizations by which the group of blocks is to be held, and a verification frequency for the hash value between the organizations; specifying a group of blocks to be held by the organization; deleting a block other than the group of blocks in the blockchain 215; and performing a tamper verification of requesting a node 211 of another organization to transmit the hash value of the group of blocks to be held by the other organization at a verification frequency, and collating the hash value with the hash value included in the end block 102.

Abstract: In some examples, a first computing device of a first entity receives a first digital certificate from a certificate authority computing device and generates a first self-signed certificate associated with the first digital certificate. The first computing device may store the first self-signed certificate associated with the first digital certificate in a repository associated with a repository computing device. Further, the first computing device may receive a notification indicating an update by a computing device of a second entity to contents of the repository. The first computing device receives a copy of the contents of the repository including at least a second digital certificate and a second self-signed certificate associated with the second entity. The first computing device may verify the contents of the repository and generate a genesis block of a blockchain based on a result of the verifying.

Abstract: In some examples, a first computing device of a first entity receives a first digital certificate from a certificate authority computing device and generates a first self-signed certificate associated with the first digital certificate. The first computing device may store the first self-signed certificate associated with the first digital certificate in a repository associated with a repository computing device. Further, the first computing device may receive a notification indicating an update by a computing device of a second entity to contents of the repository. The first computing device receives a copy of the contents of the repository including at least a second digital certificate and a second self-signed certificate associated with the second entity. The first computing device may verify the contents of the repository and generate a genesis block of a blockchain based on a result of the verifying.

Abstract: A gas barrier sheet material which make effective use of natural resources and which has improved gas barrier properties including oxygen barrier properties, water vapor barrier properties and smell barrier properties, and improved flexibility; a barrier container using the same; and a method for fabricating a sheet material. A sheet material is characterized in that a fine fiber layer and a moisture-retaining layer are stacked on at least one surface of a substrate in such a way that the fine fiber layer and the moisture-retaining layer are in direct contact with each other. The invention is more advantageous when using a substrate, e.g. paper, a nonwoven fabric, or a porous membrane, of which surface profile is not flat and which is inherently susceptible to causing troubles in fabrication processes, such as of soaking, wetting and drying during coating of a coating agent.

Abstract: A laminate having high adhesion between a fine cellulose layer and a base material, a method for producing the same, and a gas barrier material. The laminate is such that a fine cellulose layer containing fine cellulose having a carboxyl group is laminated on the base material, and a mixed layer in which the fine cellulose is mixed in the base material is further interposed between the base material and the fine cellulose layer. This laminate can be produced by coating the base material with a dispersion containing fine cellulose having a carboxyl group, swelling the base material with the thus coated dispersion, and drying the swollen base material and the coated dispersion. The laminate may also be produced by providing a swollen base material, coating the swollen base material with a dispersion containing fine cellulose having a carboxyl group, and drying the base material and the coated dispersion.

Abstract: Disclosed is a material that effectively utilizes natural resources and is friendly to the environment as a whole. Specifically, disclosed is a barrier material that has excellent strength and excellent affinity and adhesion to a paper base due to an interaction with paper fibers and that gives sufficient barrier properties even in the form of a thin film. A laminated body (100) includes, on at least one surface of a base (1) made of paper, a fiber layer (2) containing fine cellulose fibers each having a fiber diameter of 1 nm or more and 10 ?m or less. In particular, the fine cellulose fibers preferably have a fiber diameter of 1 nm or more and 30 nm or less.

Abstract: A method for preparing a cellulose dispersion includes oxidizing cellulose; preparing cellulose nanofibers by defibrating the oxidized cellulose; and adding a water-soluble polymer and inorganic particles to the dispersion containing the cellulose nanofibers.

Abstract: A method for preparing a cellulose dispersion includes oxidizing cellulose; preparing cellulose nanofibers by defibrating the oxidized cellulose; and adding a water-soluble polymer and inorganic particles to the dispersion containing the cellulose nanofibers.

Abstract: [Problem] To provide a composition for film formation comprising cellulose fibers, a layered inorganic compound, and a water-soluble polymer, which are each dispersed on nano level, a method for preparing a cellulose dispersion capable of forming a moisture-resistant film containing cellulose nanofibers, a gas-barrier laminate obtained by use of the dispersion, and a packaging material using the laminate. [Solution] A film-forming composition comprising at least cellulose fibers and a swollen inorganic compound is prepared. The method of preparing a cellulose dispersion comprises the steps of oxidizing cellulose, fibrillating the thus oxidized cellulose to prepare cellulose nanofibers, and adding a water-soluble polymer and inorganic particles to the dispersion containing the cellulose nanofibers.

Abstract: A gas barrier sheet material which make effective use of natural resources and which has improved gas barrier properties including oxygen barrier properties, water vapor barrier properties and smell barrier properties, and improved flexibility; a barrier container using the same; and a method for fabricating a sheet material. A sheet material is characterized in that a fine fiber layer and a moisture-retaining layer are stacked on at least one surface of a substrate in such a way that the fine fiber layer and the moisture-retaining layer are in direct contact with each other. The invention is more advantageous when using a substrate, e.g. paper, a nonwoven fabric, or a porous membrane, of which surface profile is not flat and which is inherently susceptible to causing troubles in fabrication processes, such as of soaking, wetting and drying during coating of a coating agent.