Information processing system, information processing method, server, block chain node, and program

A server in an information processing system including the server, a plurality of block chain nodes, and a plurality of terminals, wherein:

• the terminal:
• transmits, to the server, generation target item identification data expressing identification information of a generation target item, raw material identification data that is identification information of a raw material used when generating the generation target item, numerical quantity data expressing a numerical quantity of the raw material, and generation source item identification data expressing identification information of a generation source item;
• the server:
• computes a commitment value of the generation target item by performing a secret computation based on a parameter value and the numerical quantity data corresponding to the raw material;
• stores a combination of the raw material identification data and the generation target item identification data in a specific data structure;
• acquires first transaction data that is transaction data recorded in a block chain stored in a storage section of the block chain node and that is transaction data containing the generation source item identification data in output data;
• and
• broadcasts, to the plurality of block chain nodes, second transaction data that is transaction data containing an address expressing an originator of the generation target item, an address expressing a recipient of the generation target item, and the data structure, and that includes the generation source item identification data in input data and that includes the data structure including the generation target item identification data in output data;
• and
• each of the plurality of block chain nodes:
• reads from a block chain each first transaction data that is past transaction data linked to the second transaction data broadcast by the server;
• verifies whether or not the generation target item of the second transaction data is configured by the raw material contained in the generation source item of the first transaction data based on a relationship between the commitment value of the generation target item contained in the second transaction data and a commitment value of the generation source item contained in the first transaction data;
• and
• records the second transaction data in the block chain in cases in which the generation target item of the second transaction data has been determined to be configured from the raw material of the first transaction data.

A block chain node in an information processing system including a server, a plurality of the block chain nodes, and a plurality of terminals, wherein:

• the terminal:
• transmits, to the server, generation target item identification data expressing identification information of a generation target item, raw material identification data that is identification information of a raw material used when generating the generation target item, numerical quantity data expressing a numerical quantity of the raw material, and generation source item identification data expressing identification information of a generation source item;
• the server:
• computes a commitment value of the generation target item by performing a secret computation based on a parameter value and the numerical quantity data corresponding to the raw material;
• stores a combination of the raw material identification data and the generation target item identification data in a specific data structure;
• acquires first transaction data that is transaction data recorded in a block chain stored in a storage section of the block chain node and that is transaction data containing the generation source item identification data in output data;
• and
• broadcasts, to the plurality of block chain nodes, second transaction data that is transaction data containing an address expressing an originator of the generation target item, an address expressing a recipient of the generation target item, and the data structure, and that includes the generation source item identification data in input data and that includes the data structure including the generation target item identification data in output data;
• and
• each of the plurality of block chain nodes:
• reads from a block chain each first transaction data that is past transaction data linked to the second transaction data broadcast by the server;
• verifies whether or not the generation target item of the second transaction data is configured by the raw material contained in the generation source item of the first transaction data based on a relationship between the commitment value of the generation target item contained in the second transaction data and a commitment value of the generation source item contained in the first transaction data;
• and
• records the second transaction data in the block chain in cases in which the generation target item of the second transaction data has been determined to be configured from the raw material of the first transaction data.

An information processing method that is executed in an information processing system including a server, a plurality of the block chain nodes, and a plurality of terminals, wherein in the information processing method:

• the terminal:
• transmits, to the server, generation target item identification data expressing identification information of a generation target item, raw material identification data that is identification information of a raw material used when generating the generation target item, numerical quantity data expressing a numerical quantity of the raw material, and generation source item identification data expressing identification information of a generation source item;
• the server:
• computes a commitment value of the generation target item by performing a secret computation based on a parameter value and the numerical quantity data corresponding to the raw material;
• stores a combination of the raw material identification data and the generation target item identification data in a specific data structure;
• acquires first transaction data that is transaction data recorded in a block chain stored in a storage section of the block chain node and that is transaction data containing the generation source item identification data in output data;
• and
• broadcasts, to the plurality of block chain nodes, second transaction data that is transaction data containing an address expressing an originator of the generation target item, an address expressing a recipient of the generation target item, and the data structure, and that includes the generation source item identification data in input data and that includes the data structure including the generation target item identification data in output data;
• and
• each of the plurality of block chain nodes:
• reads from a block chain each first transaction data that is past transaction data linked to the second transaction data broadcast by the server;
• verifies whether or not the generation target item of the second transaction data is configured by the raw material contained in the generation source item of the first transaction data based on a relationship between the commitment value of the generation target item contained in the second transaction data and a commitment value of the generation source item contained in the first transaction data;
• and
• records the second transaction data in the block chain in cases in which the generation target item of the second transaction data has been determined to be configured from the raw material of the first transaction data.

A program for execution by a server of an information processing system including the server, a plurality of the block chain nodes, and a plurality of terminals, wherein:

• the terminal:
• transmits, to the server, generation target item identification data expressing identification information of a generation target item, raw material identification data that is identification information of a raw material used when generating the generation target item, numerical quantity data expressing a numerical quantity of the raw material, and generation source item identification data expressing identification information of a generation source item;
• the server:
• computes a commitment value of the generation target item by performing a secret computation based on a parameter value and the numerical quantity data corresponding to the raw material;
• stores a combination of the raw material identification data and the generation target item identification data in a specific data structure;
• acquires first transaction data that is transaction data recorded in a block chain stored in a storage section of the block chain node and that is transaction data containing the generation source item identification data in output data;
• and
• broadcasts, to the plurality of block chain nodes, second transaction data that is transaction data containing an address expressing an originator of the generation target item, an address expressing a recipient of the generation target item, and the data structure, and that includes the generation source item identification data in input data and that includes the data structure including the generation target item identification data in output data;
• and
• each of the plurality of block chain nodes:
• reads from a block chain each first transaction data that is past transaction data linked to the second transaction data broadcast by the server;
• verifies whether or not the generation target item of the second transaction data is configured by the raw material contained in the generation source item of the first transaction data based on a relationship between the commitment value of the generation target item contained in the second transaction data and a commitment value of the generation source item contained in the first transaction data;
• and
• records the second transaction data in the block chain in cases in which the generation target item of the second transaction data has been determined to be configured from the raw material of the first transaction data.

A program for execution by a block chain node in an information processing system including a server, a plurality of the block chain nodes, and a plurality of terminals, wherein:

• the terminal:
• transmits, to the server, generation target item identification data expressing identification information of a generation target item, raw material identification data that is identification information of a raw material used when generating the generation target item, numerical quantity data expressing a numerical quantity of the raw material, and generation source item identification data expressing identification information of a generation source item;
• the server:
• computes a commitment value of the generation target item by performing a secret computation based on a parameter value and the numerical quantity data corresponding to the raw material;
• stores a combination of the raw material identification data and the generation target item identification data in a specific data structure;
• acquires first transaction data that is transaction data recorded in a block chain stored in a storage section of the block chain node and that is transaction data containing the generation source item identification data in output data;
• and
• broadcasts, to the plurality of block chain nodes, second transaction data that is transaction data containing an address expressing an originator of the generation target item, an address expressing a recipient of the generation target item, and the data structure, and that includes the generation source item identification data in input data and that includes the data structure including the generation target item identification data in output data;
• and
• each of the plurality of block chain nodes:
• reads from a block chain each first transaction data that is past transaction data linked to the second transaction data broadcast by the server;
• verifies whether or not the generation target item of the second transaction data is configured by the raw material contained in the generation source item of the first transaction data based on a relationship between the commitment value of the generation target item contained in the second transaction data and a commitment value of the generation source item contained in the first transaction data;
• and
• records the second transaction data in the block chain in cases in which the generation target item of the second transaction data has been determined to be configured from the raw material of the first transaction data.