JP7367911B2 - information processing system - Google Patents

Description

The present invention relates to an information processing system.

Currently, there is no mechanism in place to ensure that image data has been approved by a specific institution (for example, a well-known brand manufacturer, major company, local government, etc.).

Specifically, for example, if Mr. A takes a photo to commemorate his visit to a tourist spot, we can confirm that the photo was actually taken by Mr. A at that tourist spot. There is no system in place for the local government that administers the certificate. Therefore, if Mr. A uploads an image taken at a tourist spot to a social networking service (SNS), the image will be downloaded from the SNS by Mr. B, who has not visited the tourist spot, and the image will be viewed as if Mr. B had visited the tourist spot. There is a possibility that it could be used illegally as if the photo was taken during a visit.

Or, for example, an image of a product listed on an auction site is a legitimate use of an image of a genuine product that has received permission to use from the brand manufacturer that manufactured the product, and is not licensed for use. There is no mechanism in place for the brand manufacturer to prove that it is not being used illegally. As a result, fraudulent activities such as displaying images of genuine products on auction sites but selling bulk products without product warranties have become a problem.

Patent Document 1 proposes an image certification system that adds date and time information and certification information to image data and registers the data in an image storage means in order to improve the credibility of the image data.

Japanese Patent Application Publication No. 2006-244301

However, even if the system of Patent Document 1 were adopted by a specific institution, a third party with malicious intent could illegally access the system and replace the image data registered in the image storage means with another image. It is undeniable that the image data may be tampered with or tampered with, and there is no mechanism in place to guarantee that the image data has been approved by the specific institution concerned.

The present invention has been made in consideration of the above points. An object of the present invention is to provide a mechanism for ensuring that image data is approved by a specific organization.

The information processing system according to the first aspect of the present invention includes:
an approval device that approves image data;
an application device that applies to the approval device for approval of image data;
Equipped with
The application device is
an approval application information registration unit that sends a first transaction in which approval application information and approval agency information are stored to a blockchain network;
a first specific information storage unit that stores a two-dimensional code in which first specific information for specifying the first transaction registered in the blockchain is encoded, embedded in image data;
an image data transmitter that transmits image data in which the two-dimensional code is embedded to an approval device;
has
The approval device includes:
an image data receiving unit that receives image data in which a two-dimensional code is embedded from the application device;
An approval application that identifies a first transaction on the blockchain based on first specific information extracted by decoding a two-dimensional code embedded in the image data, and obtains approval application information from the identified first transaction. Information acquisition department;
an image data approval unit that refers to the approval application information and approves the image data;
an approval data registration unit that transmits a second transaction in which approval data including a hash value of the approved image data and the first specific information and approval agency information are stored to a blockchain network;
has.

According to this aspect, when applying for approval of image data, the first transaction in which approval application information is stored is registered in the blockchain, so it is virtually impossible to modify the approval application information after the fact. becomes. Further, since a two-dimensional code in which the specific information of the first transaction (first specific information) is encoded is embedded in the image data, the image data and the first specific information can be easily linked and managed. When the image data is approved, the first transaction registered on the blockchain is identified based on the first specific information extracted by decoding the two-dimensional code embedded in the image data, and the first transaction registered on the blockchain is identified. Since the image data is approved by referring to the obtained approval application information, it is possible to prevent image data from being erroneously approved based on unauthorized alteration of the approval application information. Then, since a second transaction in which approval data including the hash value of the approved image data and the first specific information is stored is registered in the blockchain, the approval data indicating approval is modified after the fact. This becomes virtually impossible. This makes it possible to guarantee that the image data has been approved by the approval organization. That is, for example, when verifying whether image data has been altered, the first transaction on the blockchain is determined based on the first specific information extracted by decoding the two-dimensional code embedded in the image data to be verified. Approval authority information is obtained from the specified first transaction, a second transaction on the blockchain is searched using the first specific information and approval authority information as a search key, and approval data is obtained from the second transaction that is hit. By confirming that the hash value of the acquired image data to be verified matches the hash value included in the approval data acquired from the second transaction on the blockchain, the image data to be verified is verified. It can be guaranteed that the image data has not been altered (that is, that the image data has been approved by the approval authority). Furthermore, for example, by outputting the approval application information obtained from the identified first transaction to the output unit, it is possible to confirm the source of the image data to be verified based on the content of the approval application information. can.

Furthermore, according to such an aspect, even if the file properties or file name are changed without permission due to the operation of the operating system (OS) when copying image data, the image data will be saved. When verifying the presence or absence of alteration, the first transaction on the blockchain is identified based on the first specific information extracted by decoding the two-dimensional code embedded in the target image data, and the identified first The approval authority information is acquired from the transaction, and the second transaction on the blockchain is searched using the first specific information and the approval authority information as a search key, whereby the second transaction registered on the blockchain is identified, Based on the hash value included in the approval data obtained from the second transaction, it can be guaranteed that the target image data has not been altered.

The information processing system according to the second aspect of the present invention includes:
an approval device that approves image data;
an application device that applies to the approval device for approval of image data;
Equipped with
The application device is
an approval application information registration unit that sends a first transaction in which approval application information and approval agency information are stored to a blockchain network;
a first specific information storage unit that stores a two-dimensional code in which first specific information for specifying the first transaction registered in the blockchain is encoded, embedded in image data;
an image data registration unit that transmits a third transaction in which image data in which the two-dimensional code is embedded is stored to a blockchain network;
an image data transmission unit that transmits image data in which the two-dimensional code is embedded and third identification information for identifying the third transaction registered in a blockchain to an approval device;
has
The approval device includes:
an image data receiving unit that receives image data embedded with a two-dimensional code and third specific information from the application device;
The first transaction on the blockchain is identified based on the first specific information extracted by decoding the two-dimensional code embedded in the image data received from the application device, and approval application information is obtained from the identified first transaction. an approval application information acquisition unit that acquires the
an image data acquisition unit that identifies a third transaction on the blockchain based on third specific information received from the application device and acquires image data from the identified third transaction;
an image data approval unit that approves the image data received from the application device by referring to the approval application information obtained from the first transaction and the image data obtained from the third transaction;
an approval data registration unit that transmits a second transaction in which approval data including a hash value of the approved image data, the first specific information, and the third specific information and approval agency information are stored to a blockchain network; ,
has.

According to this aspect, when applying for approval of image data, the first transaction in which approval application information is stored is registered in the blockchain, so it is virtually impossible to modify the approval application information after the fact. becomes. Further, since a two-dimensional code in which the specific information of the first transaction (first specific information) is encoded is embedded in the image data, the image data and the first specific information can be easily linked and managed. Furthermore, since the third transaction in which the image data with the two-dimensional code embedded is stored is registered on the blockchain, it is virtually impossible to modify the image data with the two-dimensional code embedded after the fact. Become. When the image data is approved, the first transaction registered on the blockchain is identified based on the first specific information extracted by decoding the two-dimensional code embedded in the image data received from the application device. At the same time, the third transaction registered on the blockchain is identified based on the third identification information received from the application device, and the approval application information acquired from the first transaction and the image data acquired from the third transaction are identified. Since the image data received from the application device is referred to and approved, it is possible to prevent image data from being erroneously approved based on unauthorized alteration of approval application information or image data. Then, since the second transaction in which the approval data including the hash value of the approved image data, the first specific information, and the third specific information is stored is stored in the blockchain, the approval data indicating that the image data has been approved is stored. Modification after the fact is virtually impossible. This makes it possible to guarantee that the image data has been approved by the approval organization. That is, for example, when verifying whether image data has been altered, the first transaction on the blockchain is determined based on the first specific information extracted by decoding the two-dimensional code embedded in the image data to be verified. Approval authority information is obtained from the specified first transaction, a second transaction on the blockchain is searched using the first specific information and approval authority information as a search key, and approval data is obtained from the second transaction that is hit. By confirming that the hash value of the acquired image data to be verified matches the hash value included in the approval data acquired from the second transaction on the blockchain, the image data to be verified is verified. It can be guaranteed that the image data has not been altered (that is, that the image data has been approved by the approval authority). Furthermore, for example, by outputting the approval application information obtained from the identified first transaction to the output unit, it is possible to confirm the source of the image data to be verified based on the content of the approval application information. can. Furthermore, a third transaction on the blockchain is identified based on the third specific information included in the approval data, and image data is acquired from the identified third transaction and output to the output unit, thereby making it eligible for verification. Users can intuitively confirm that the image data displayed matches the image data registered on the blockchain.

Furthermore, according to such an aspect, even if the file properties or file name are changed without permission due to the operation of the operating system (OS) when copying image data, the image data will be saved. When verifying the presence or absence of alteration, the first transaction on the blockchain is identified based on the first specific information extracted by decoding the two-dimensional code embedded in the target image data, and the identified first By acquiring the approval authority information from the transaction and searching for the second transaction on the blockchain using the first specific information and the approval authority information as search keys, the second transaction registered on the blockchain is identified and the corresponding Based on the hash value included in the approval data obtained from the second transaction, it can be guaranteed that the target image data has not been altered.

The information processing system according to the third aspect of the present invention is the information processing system according to the first or second aspect,
The approval device includes:
further comprising a second specific information transmitting unit that transmits second specific information for specifying a second transaction registered in the blockchain to the application device,
The application device is
The image processing apparatus further includes a second specific information storage unit that stores the second specific information received from the approval device in a file property or file name that does not affect a hash value of image data in which the two-dimensional code is embedded.

According to this aspect, when image data is approved, the specific information of the second transaction (second specific information) is stored in the file property or file name of the image data, so that the image data and the second specific information can be easily linked and managed. When verifying whether or not image data has been altered, a second transaction on the blockchain is identified and identified based on second specific information extracted from the file properties or file name of the image data to be verified. The approval data is obtained from the second transaction, and it is confirmed that the hash value of the image data to be verified matches the hash value included in the approval data obtained from the second transaction on the blockchain. , it can be guaranteed that the image data to be verified has not been altered (that is, the image data has been approved by the approval organization).

An information processing system according to a fourth aspect of the present invention is an information processing system according to any one of the first to third aspects, comprising:
It is further equipped with a verification device that verifies whether or not the image data has been altered.
The verification device includes:
The first transaction on the blockchain is identified based on the first specific information extracted by decoding the two-dimensional code embedded in the image data to be verified, and approval application information and approval are obtained from the identified first transaction. an approval application information output unit that acquires institutional information and outputs the approval application information to an output unit;
A second transaction on the blockchain is searched using the first specific information and the approval authority information as a search key, and if there is no hit, it is determined that the image data to be verified has been altered, and if a hit is found. an approval data acquisition unit that acquires approval data from the hit second transaction;
a modification determination unit that compares the hash value of the image data to be verified with the hash value included in the approval data obtained from the second transaction on the blockchain to determine whether or not the image data to be verified has been modified; and,
has.

The information processing system according to the fifth aspect of the present invention is the information processing system according to the third aspect, comprising:
It is further equipped with a verification device that verifies whether or not the image data has been altered.
The verification device includes:
Identify the first transaction on the blockchain based on the first specific information extracted by decoding the two-dimensional code embedded in the image data to be verified, and obtain approval application information from the identified first transaction. and an approval application information output unit that outputs the approval application information to an output unit;
Approval data acquisition that identifies a second transaction on the blockchain based on second specific information extracted from the file property or file name of the image data to be verified, and acquires approval data from the identified second transaction. Department and
a modification determination unit that compares the hash value of the image data to be verified with the hash value included in the approval data obtained from the second transaction on the blockchain to determine whether or not the image data to be verified has been modified; and,
has.

The information processing system according to the sixth aspect of the present invention is the information processing system according to the fourth or fifth aspect that cites the second aspect,
The verification device includes:
A third transaction on the blockchain is specified based on the third specific information included in the approval data obtained from the second transaction on the blockchain, and image data is obtained from the specified third transaction and sent to the output section. It further includes an image data output section for outputting image data.

The application device according to the seventh aspect of the present invention includes:
An application device that applies to an approval device for approval of image data, the application device comprising:
an approval application information registration unit that sends a first transaction in which approval application information and approval agency information are stored to a blockchain network;
a first specific information storage unit that stores a two-dimensional code in which first specific information for specifying the first transaction registered in the blockchain is encoded, embedded in image data;
an image data transmitter that transmits image data in which the two-dimensional code is embedded to an approval device;
Equipped with

An approval device according to an eighth aspect of the present invention includes:
An approval device that approves image data,
an image data receiving unit that receives image data in which the two-dimensional code is embedded from the application device;
An approval application that identifies a first transaction on the blockchain based on first specific information extracted by decoding a two-dimensional code embedded in the image data, and obtains approval application information from the identified first transaction. Information acquisition department;
an image data approval unit that refers to the approval application information and approves the image data;
an approval data registration unit that transmits a second transaction in which approval data including a hash value of the approved image data and the first specific information and approval agency information are stored to a blockchain network;
Equipped with

A verification device according to a ninth aspect of the present invention includes:
A verification device for verifying whether or not image data has been altered,
The first transaction on the blockchain is identified based on the first specific information extracted by decoding the two-dimensional code embedded in the image data to be verified, and approval application information and approval are obtained from the identified first transaction. an approval application information output unit that acquires institutional information and outputs the approval application information to an output unit;
A second transaction on the blockchain is searched using the first specific information and the approval authority information as a search key, and if there is no hit, it is determined that the image data to be verified has been altered, and if a hit is found. an approval data acquisition unit that acquires approval data from the hit second transaction;
a modification determination unit that compares the hash value of the image data to be verified with the hash value included in the approval data obtained from the second transaction on the blockchain to determine whether or not the image data to be verified has been modified; and,
Equipped with

The application device according to the tenth aspect of the present invention includes:
An application device that applies to an approval device for approval of image data, the application device comprising:
an approval application information registration unit that sends a first transaction in which approval application information and approval agency information are stored to a blockchain network;
a first specific information storage unit that stores a two-dimensional code in which first specific information for specifying the first transaction registered in the blockchain is encoded, embedded in image data;
an image data registration unit that transmits a third transaction in which image data in which the two-dimensional code is embedded is stored to a blockchain network;
an image data transmission unit that transmits image data in which the two-dimensional code is embedded and third identification information for identifying the third transaction registered in a blockchain to an approval device;
Equipped with

An approval device according to an eleventh aspect of the present invention includes:
An approval device that approves image data,
an image data receiving unit that receives image data embedded with a two-dimensional code and third specific information from the application device;
The first transaction on the blockchain is identified based on the first specific information extracted by decoding the two-dimensional code embedded in the image data received from the application device, and approval application information is obtained from the identified first transaction. an approval application information acquisition unit that acquires the
an image data acquisition unit that identifies a third transaction on the blockchain based on third specific information received from the application device and acquires image data from the identified third transaction;
an image data approval unit that approves the image data by referring to the approval application information obtained from the first transaction and the image data obtained from the third transaction;
an approval data registration unit that transmits a second transaction in which approval data including a hash value of the approved image data, the first specific information, and the third specific information and approval agency information are stored to a blockchain network; ,
Equipped with

A verification device according to a twelfth aspect of the present invention includes:
A verification device for verifying whether or not image data has been altered,
The first transaction on the blockchain is identified based on the first specific information extracted by decoding the two-dimensional code embedded in the image data to be verified, and approval application information and approval are obtained from the identified first transaction. an approval application information output unit that acquires institutional information and outputs the approval application information to an output unit;
A second transaction on the blockchain is searched using the first specific information and the approval authority information as a search key, and if there is no hit, it is determined that the image data to be verified has been altered, and if a hit is found. an approval data acquisition unit that acquires approval data from the hit second transaction;
a modification determination unit that compares the hash value of the image data to be verified with the hash value included in the approval data obtained from the second transaction on the blockchain to determine whether or not the image data to be verified has been modified; and,
A third transaction on the blockchain is specified based on the third specific information included in the approval data obtained from the second transaction on the blockchain, and image data is obtained from the specified third transaction and sent to the output section. an image data output section to output;
Equipped with

The information processing method according to the thirteenth aspect of the present invention includes:
An information processing method executed by a computer that requests approval of image data from an approval device, the method comprising:
an approval application information registration step of transmitting a first transaction in which approval application information and approval agency information are stored to a blockchain network;
a first specific information storage step of embedding and storing a two-dimensional code encoded with first specific information for specifying the first transaction registered in the blockchain in image data;
an image data transmitting step of transmitting the image data in which the two-dimensional code is embedded to an approval device;
including.

The information processing method according to the fourteenth aspect of the present invention includes:
An information processing method executed by a computer that approves image data, the method comprising:
an image data receiving step of receiving image data in which the two-dimensional code is embedded from the application device;
An approval application that identifies a first transaction on the blockchain based on first specific information extracted by decoding a two-dimensional code embedded in the image data, and obtains approval application information from the identified first transaction. an information acquisition step;
an image data approval unit that refers to the approval application information and approves the image data;
an approval data registration step of transmitting a second transaction in which approval data including a hash value of the approved image data and the first specific information and approval agency information are stored to a blockchain network;
including.

The information processing method according to the fifteenth aspect of the present invention includes:
An information processing method executed by a computer for verifying whether image data has been altered, the method comprising:
The first transaction on the blockchain is identified based on the first specific information extracted by decoding the two-dimensional code embedded in the image data to be verified, and approval application information and approval are obtained from the identified first transaction. an approval application information output step of acquiring institutional information and outputting the approval application information to an output unit;
A second transaction on the blockchain is searched using the first specific information and the approval authority information as a search key, and if there is no hit, it is determined that the image data to be verified has been altered, and if a hit is found. includes an approval data acquisition step of obtaining approval data from the second hit transaction;
A modification determination step of comparing the hash value of the image data to be verified with the hash value included in the approval data obtained from the second transaction on the blockchain to determine whether or not the image data to be verified has been modified. and,
including.

The information processing method according to the sixteenth aspect of the present invention includes:
An information processing method executed by a computer that requests approval of image data from an approval device, the method comprising:
an approval application information registration step of transmitting a first transaction in which approval application information and approval agency information are stored to a blockchain network;
a first specific information storage step of embedding and storing a two-dimensional code encoded with first specific information for specifying the first transaction registered in the blockchain in image data;
an image data registration step of transmitting a third transaction in which image data in which the two-dimensional code is embedded is stored to a blockchain network;
an image data transmitting step of transmitting image data in which the two-dimensional code is embedded and third specifying information for specifying the third transaction registered in the blockchain to an approval device;
including.

The information processing method according to the seventeenth aspect of the present invention includes:
An information processing method executed by a computer that approves image data, the method comprising:
an image data receiving step of receiving image data embedded with a two-dimensional code and third specific information from the application device;
The first transaction on the blockchain is identified based on the first specific information extracted by decoding the two-dimensional code embedded in the image data received from the application device, and approval application information is obtained from the identified first transaction. an approval application information acquisition step for acquiring the
an image data acquisition step of identifying a third transaction on the blockchain based on third identification information received from the application device and acquiring image data from the identified third transaction;
an image data approval step of approving the image data by referring to the approval application information obtained from the first transaction and the image data obtained from the third transaction;
an approval data registration step of transmitting a second transaction in which approval data including a hash value of the approved image data, the first specific information, and the third specific information and approval agency information are stored to a blockchain network; ,
including.

The information processing method according to the eighteenth aspect of the present invention includes:
An information processing method executed by a computer for verifying whether image data has been altered, the method comprising:
The first transaction on the blockchain is identified based on the first specific information extracted by decoding the two-dimensional code embedded in the image data to be verified, and approval application information and approval are obtained from the identified first transaction. an approval application information output step of acquiring institutional information and outputting the approval application information to an output unit;
A second transaction on the blockchain is searched using the first specific information and the approval authority information as a search key, and if there is no hit, it is determined that the image data to be verified has been altered, and if a hit is found. includes an approval data acquisition step of obtaining approval data from the second hit transaction;
A modification determination step of comparing the hash value of the image data to be verified with the hash value included in the approval data obtained from the second transaction on the blockchain to determine whether or not the image data to be verified has been modified. and,
A third transaction on the blockchain is specified based on the third specific information included in the approval data obtained from the second transaction on the blockchain, and image data is obtained from the specified third transaction and sent to the output section. an image data output step;
including.

An information processing program according to a nineteenth aspect of the present invention includes:
The computer that requests image data approval from the approval device.
an approval application information registration step of transmitting a first transaction in which approval application information and approval agency information are stored to a blockchain network;
a first specific information storage step of embedding and storing a two-dimensional code encoded with first specific information for specifying the first transaction registered in the blockchain in image data;
an image data transmitting step of transmitting the image data in which the two-dimensional code is embedded to an approval device;
Execute.

The information processing program according to the twentieth aspect of the present invention includes:
The computer that approves the image data
an image data receiving step of receiving image data in which the two-dimensional code is embedded from the application device;
An approval application that identifies a first transaction on the blockchain based on first specific information extracted by decoding a two-dimensional code embedded in the image data, and obtains approval application information from the identified first transaction. an information acquisition step;
an image data approval unit that refers to the approval application information and approves the image data;
an approval data registration step of transmitting a second transaction in which approval data including a hash value of the approved image data and the first specific information and approval agency information are stored to a blockchain network;
Execute.

An information processing program according to a twenty-first aspect of the present invention includes:
A computer that verifies whether the image data has been altered,
The first transaction on the blockchain is identified based on the first specific information extracted by decoding the two-dimensional code embedded in the image data to be verified, and approval application information and approval are obtained from the identified first transaction. an approval application information output step of acquiring institutional information and outputting the approval application information to an output unit;
A second transaction on the blockchain is searched using the first specific information and the approval authority information as a search key, and if there is no hit, it is determined that the image data to be verified has been altered, and if a hit is found. includes an approval data acquisition step of obtaining approval data from the second hit transaction;
A modification determination step of comparing the hash value of the image data to be verified with the hash value included in the approval data obtained from the second transaction on the blockchain to determine whether or not the image data to be verified has been modified. and,
Execute.

An information processing program according to a twenty-second aspect of the present invention includes:
The computer that requests image data approval from the approval device.
an approval application information registration step of transmitting a first transaction in which approval application information and approval agency information are stored to a blockchain network;
a first specific information storage step of embedding and storing a two-dimensional code encoded with first specific information for specifying the first transaction registered in the blockchain in image data;
an image data registration step of transmitting a third transaction in which image data in which the two-dimensional code is embedded is stored to a blockchain network;
an image data transmitting step of transmitting image data in which the two-dimensional code is embedded and third specifying information for specifying the third transaction registered in the blockchain to an approval device;
Execute.

An information processing program according to a twenty-third aspect of the present invention includes:
The computer that approves the image data
an image data receiving step of receiving image data embedded with a two-dimensional code and third specific information from the application device;
The first transaction on the blockchain is identified based on the first specific information extracted by decoding the two-dimensional code embedded in the image data received from the application device, and approval application information is obtained from the identified first transaction. an approval application information acquisition step for acquiring the
an image data acquisition step of identifying a third transaction on the blockchain based on third identification information received from the application device and acquiring image data from the identified third transaction;
an image data approval step of approving the image data by referring to the approval application information obtained from the first transaction and the image data obtained from the third transaction;
an approval data registration step of transmitting a second transaction in which approval data including a hash value of the approved image data, the first specific information, and the third specific information and approval agency information are stored to a blockchain network; ,
Execute.

The information processing program according to the twenty-fourth aspect of the present invention is:
A computer that verifies whether the image data has been altered,
The first transaction on the blockchain is identified based on the first specific information extracted by decoding the two-dimensional code embedded in the image data to be verified, and approval application information and approval are obtained from the identified first transaction. an approval application information output step of acquiring institutional information and outputting the approval application information to an output unit;
A second transaction on the blockchain is searched using the first specific information and the approval authority information as a search key, and if there is no hit, it is determined that the image data to be verified has been altered, and if a hit is found. includes an approval data acquisition step of obtaining approval data from the second hit transaction;
A modification determination step of comparing the hash value of the image data to be verified with the hash value included in the approval data obtained from the second transaction on the blockchain to determine whether or not the image data to be verified has been modified. and,
A third transaction on the blockchain is specified based on the third specific information included in the approval data obtained from the second transaction on the blockchain, and image data is obtained from the specified third transaction and sent to the output section. an image data output step;
Execute.

A computer-readable recording medium according to the twenty-fifth aspect of the present invention includes:
The computer that requests image data approval from the approval device.
an approval application information registration step of transmitting a first transaction in which approval application information and approval agency information are stored to a blockchain network;
a first specific information storage step of embedding and storing a two-dimensional code encoded with first specific information for specifying the first transaction registered in the blockchain in image data;
an image data transmitting step of transmitting the image data in which the two-dimensional code is embedded to an approval device;
An information processing program is recorded that is characterized in that it executes.

A computer-readable recording medium according to the twenty-sixth aspect of the present invention includes:
The computer that approves the image data
an image data receiving step of receiving image data in which the two-dimensional code is embedded from the application device;
An approval application that identifies a first transaction on the blockchain based on first specific information extracted by decoding a two-dimensional code embedded in the image data, and obtains approval application information from the identified first transaction. an information acquisition step;
an image data approval unit that refers to the approval application information and approves the image data;
an approval data registration step of transmitting a second transaction in which approval data including a hash value of the approved image data and the first specific information and approval agency information are stored to a blockchain network;
An information processing program is recorded that is characterized in that it executes.

A computer-readable recording medium according to a twenty-seventh aspect of the present invention includes:
A computer that verifies whether the image data has been altered,
The first transaction on the blockchain is identified based on the first specific information extracted by decoding the two-dimensional code embedded in the image data to be verified, and approval application information and approval are obtained from the identified first transaction. an approval application information output step of acquiring institutional information and outputting the approval application information to an output unit;
A second transaction on the blockchain is searched using the first specific information and the approval authority information as a search key, and if there is no hit, it is determined that the image data to be verified has been altered, and if a hit is found. includes an approval data acquisition step of obtaining approval data from the second hit transaction;
A modification determination step of comparing the hash value of the image data to be verified with the hash value included in the approval data obtained from the second transaction on the blockchain to determine whether or not the image data to be verified has been modified. and,
An information processing program is recorded that is characterized in that it executes.

A computer-readable recording medium according to the twenty-eighth aspect of the present invention includes:
The computer that requests image data approval from the approval device.
an approval application information registration step of transmitting a first transaction in which approval application information and approval agency information are stored to a blockchain network;
a first specific information storage step of embedding and storing a two-dimensional code encoded with first specific information for specifying the first transaction registered in the blockchain in image data;
an image data registration step of transmitting a third transaction in which image data in which the two-dimensional code is embedded is stored to a blockchain network;
an image data transmitting step of transmitting image data in which the two-dimensional code is embedded and third specifying information for specifying the third transaction registered in the blockchain to an approval device;
An information processing program is recorded that is characterized in that it executes.

A computer-readable recording medium according to the twenty-ninth aspect of the present invention includes:
The computer that approves the image data
an image data receiving step of receiving image data embedded with a two-dimensional code and third specific information from the application device;
The first transaction on the blockchain is identified based on the first specific information extracted by decoding the two-dimensional code embedded in the image data received from the application device, and approval application information is obtained from the identified first transaction. an approval application information acquisition step for acquiring the
an image data acquisition step of identifying a third transaction on the blockchain based on third identification information received from the application device and acquiring image data from the identified third transaction;
an image data approval step of approving the image data by referring to the approval application information obtained from the first transaction and the image data obtained from the third transaction;
an approval data registration step of transmitting a second transaction in which approval data including a hash value of the approved image data, the first specific information, and the third specific information and approval agency information are stored to a blockchain network; ,
An information processing program is recorded that is characterized in that it executes.

A computer-readable recording medium according to a thirtieth aspect of the present invention includes:
A computer that verifies whether the image data has been altered,
The first transaction on the blockchain is identified based on the first specific information extracted by decoding the two-dimensional code embedded in the image data to be verified, and approval application information and approval are obtained from the identified first transaction. an approval application information output step of acquiring institutional information and outputting the approval application information to an output unit;
A second transaction on the blockchain is searched using the first specific information and the approval authority information as a search key, and if there is no hit, it is determined that the image data to be verified has been altered, and if a hit is found. includes an approval data acquisition step of obtaining approval data from the second hit transaction;
A modification determination step of comparing the hash value of the image data to be verified with the hash value included in the approval data obtained from the second transaction on the blockchain to determine whether or not the image data to be verified has been modified. and,
A third transaction on the blockchain is specified based on the third specific information included in the approval data obtained from the second transaction on the blockchain, and image data is obtained from the specified third transaction and sent to the output section. an image data output step;
An information processing program is recorded that is characterized in that it executes.

According to the present invention, it is possible to provide a mechanism for ensuring that image data is approved by a specific organization.

FIG. 1 is a diagram showing a schematic configuration of an information processing system according to an embodiment. FIG. 2 is a block diagram showing a schematic configuration of an approval device according to an embodiment. FIG. 3 is a block diagram showing a schematic configuration of an application device according to an embodiment. FIG. 4 is a block diagram showing a schematic configuration of a verification device according to an embodiment. FIG. 5 is a flowchart illustrating an example of an image data approval method according to an embodiment. FIG. 6 is a flowchart illustrating an example of an image data verification method according to an embodiment. FIG. 7 is a diagram showing the flow of information in the image data approval method according to one embodiment. FIG. 8 is a diagram showing the flow of information in the image data verification method according to one embodiment. FIG. 9 is a diagram showing an example of image data in which a two-dimensional code is embedded. FIG. 10 is a diagram showing an example of an approval application information creation screen displayed on the application device. FIG. 11 is a diagram showing an example of an approval application information confirmation screen displayed on the approval device. FIG. 12 is a diagram showing an example of an approval application information confirmation screen displayed on the verification device. FIG. 13 is a diagram showing a schematic block configuration of an approval device according to a first modified example of an embodiment. FIG. 14 is a diagram showing a schematic block configuration of an application device according to a first modified example of an embodiment. FIG. 15 is a diagram showing a schematic block configuration of a verification device according to a first modified example of an embodiment. FIG. 16A is a flowchart illustrating an example of an image data approval method according to a first modification of an embodiment. FIG. 16B is a flowchart illustrating an example of an image data approval method according to the first modification of the embodiment. FIG. 17 is a flowchart illustrating an example of an image data verification method according to a first modification of the embodiment. FIG. 18 is a diagram showing the flow of information in the image data approval method according to the first modification of the embodiment. FIG. 19 is a diagram showing the flow of information in the image data verification method according to the first modification of the embodiment.

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. In each figure, the same reference numerals are given to components having the same function, and detailed explanations of the components with the same reference numerals will not be repeated.

FIG. 1 is a diagram showing a schematic configuration of an information processing system 1 according to an embodiment.

As shown in FIG. 1, the information processing system 1 includes an approval device 2 that approves image data, an application device 3 that applies to the approval device 2 for approval of image data, and a verification device that verifies whether or not the image data has been altered. It has a device 4. At least a portion of the approval device 2, the application device 3, and the verification device 4 are realized by a computer.

As shown in FIG. 1, the approval device 2, the application device 3, and the verification device 4 are each communicably connected to one of the nodes 5 to 9 constituting the blockchain network. The network between each of the devices 2 to 4 and the nodes 5 to 9 may be either a wired line or a wireless line, and the type and form of the line does not matter.

As shown in FIG. 1, each node 5 to 9 constituting the blockchain network is connected to a plurality of nodes 5 to 9 other than itself in a Peer to Peer (P2P) manner. In the illustrated example, the node numbered 8 is a miner node, and generates a new block by bundling unprocessed transactions (performs mining). Further, at least one node among nodes 5 to 9 is a full node and stores the entire data of the blockchain. Note that as the blockchain network, for example, an existing blockchain network such as the Ethereum network can be used.

As shown in FIG. 1, an external server 10 is communicably connected to the application device 3 and the verification device 4 via a network such as the Internet. The external server 10 is, for example, a server that provides services such as social networking services (SNS), auctions, and flea markets. When the image data is uploaded from the application device 3 to the external server 10, the external server 10 generates a web page that displays the uploaded image data. When the verification device 4 accesses the web page, image data is downloaded from the external server 10 to the verification device 4.

Next, with reference to FIG. 3, the configuration of the application device 3 will be described. FIG. 3 is a block diagram schematically showing the configuration of the application device 3. As shown in FIG. As the application device 3, for example, an electronic device such as a mobile terminal such as a smartphone or a tablet terminal, a notebook computer, or a desktop computer is used.

As shown in FIG. 3, the application device 3 includes a communication section 31, a control section 32, a storage section 33, and an output section 34. The units 31 to 34 are communicably connected to each other via a bus or network.

Among these, the communication unit 31 is a communication interface for connecting the application device 3 to a network such as the Internet. The communication unit 31 transmits and receives information between the application device 3 and the nodes 6, approval device 2, and external server 10 that constitute the blockchain network via a network such as the Internet.

The output unit 34 is an interface for outputting various information from the application device 3 to a user (applicant) using the application device 3, and is, for example, a video display means such as a liquid crystal display, or an audio output means such as a speaker. Specifically, for example, the output unit 34 may display a GUI (Graphical User Interface) for accepting input operations from the user.

The storage unit 33 is, for example, nonvolatile data storage such as a flash memory. The storage unit 33 stores various data handled by the control unit 32. For example, the storage unit 33 stores image data 33a to be applied for approval and approval application information 33b. The image data 33a may be image data generated by the application device 3 (for example, image data taken with a camera function), or image data obtained from another device via a network such as the Internet. Good too. Furthermore, the image data 33a may be either still image data or moving image data.

FIG. 10 is a diagram showing an example of an approval application information creation screen displayed on the output unit 34. The approval application information 33b may include, for example, one or more of the following items: approval details, approval institution name, approver name, applicant name, and approval application information creation date. The approval application information 33b further includes a title ("Remarks" column shown in FIG. 10), a comment ("Information" column shown in FIG. 10), and location information (for example, the latitude and longitude of the application device 3) to be linked to the image data 33a. information). The contents of each item of the approval application information 33b may be input manually by the user (applicant) of the application device 3, or by reading a QR code (registered trademark) installed at the shooting location, for example. Predetermined content may be automatically input. In the example shown in Figure 10, each item of approval content, approval organization, approver name, and location information is predetermined by reading a QR code installed at a shooting point (linked to the shooting point). The applicant's name, the date of creation of the approval application information, the title associated with the image data 33a (the "Remarks" column shown in Figure 10), and the comments (the "Remarks" column shown in Figure 10) are automatically entered. The user (applicant) of the application device 3 manually inputs contents into each item in the "Information" column shown in FIG.

As shown in FIG. 3, the control section 32 includes an approval application information registration section 32a, a first specific information storage section 32b, an image data transmission section 32c, and a second specific information storage section 32d. Each of these units may be realized by a processor (not shown) in the application device 3 executing a predetermined program, or may be implemented by hardware.

The approval application information registration unit 32a generates a first transaction in which approval application information 33b and approval institution information are stored. Approval institution information is not particularly limited as long as it is information that can identify an approval institution, and is, for example, corporate version My Number (corporate number) information about an approval institution. The approval application registration unit 32a encrypts the approval application information 33b using an encryption method according to the purpose (for example, a common key encryption method such as AES), and stores the encrypted approval application information 33b and approval agency information. A first transaction may be generated. In this case, even if a public blockchain is used, the approval application information 33b registered on the blockchain may be viewed by a specific person (for example, an approval authority or a verification device) who has the key to decrypt it. 4 users). The approval application information 33b and the approval agency information are stored in the first transaction as non-rewritable (read-only) information.

The approval application information registration unit 32a transmits the first transaction in which the approval application information 33b and approval institution information are stored to the blockchain network via the communication unit 31. The first transaction sent to the blockchain network is registered in the blockchain by mining the block containing the transaction at the miner node 8, and the first transaction is registered on the blockchain to identify the first transaction. 1 specific information (for example, the hash value or address value of the first transaction) is added. Since the first transaction in which the approval application information 33b and the approval institution information are stored is registered in the blockchain, it is substantially impossible to modify the approval application information 33b and the approval institution information after the fact.

The first specific information storage unit 32b acquires specific information (first specific information) of the first transaction registered in the blockchain, and generates a two-dimensional code that encodes the first specific information. The two-dimensional code may be a QR code or a color code that displays information in an array of colors. The first specific information storage unit 32b stores a two-dimensional code in which the first specific information is encoded by embedding it in the image data 33a (see FIG. 9). Since the two-dimensional code in which the specific information of the first transaction (first specific information) is encoded is embedded in the image data 33a, the image data 33a and the specific information of the first transaction (first specific information) can be easily linked. can be managed. The image data 33a in which the two-dimensional code is embedded is stored in the storage unit 33.

The image data transmitter 32c transmits the image data 33a in which the two-dimensional code is embedded to the approval device 2 via a network such as the Internet.

The second specific information storage unit 32d stores second specific information received from the approval device 2, which will be described later, in a file property or file name that does not affect the hash value of the image data 33a in which the two-dimensional code is embedded (for example, , appended to the end of the file name).

Referring to FIG. 1, the application device 3 may upload the image data 33a in which the two-dimensional code is embedded to the external server 10 via a network such as the Internet. The external server 10 may generate a web page that displays the uploaded image data 33a.

Next, the configuration of the approval device 2 will be described with reference to FIG. 2. FIG. 2 is a block diagram showing a schematic configuration of the approval device 2. As shown in FIG. As the approval device 2, for example, an electronic device such as a notebook computer or a desktop computer is used.

As shown in FIG. 2, the approval device 2 includes a communication section 21, a control section 22, a storage section 23, and an output section 24. The units 21 to 24 are communicably connected to each other via a bus or network.

Among these, the communication unit 21 is a communication interface for connecting the approval device 2 to a network such as the Internet. The communication unit 21 transmits and receives information between the approval device 2 and the nodes 5 and application device 3 that constitute the blockchain network via a network such as the Internet.

The output unit 24 is an interface that outputs various information from the approval device 2 to the users who use the approval device 2 (the approver who is the head of the approval organization and the worker who works under the direction and supervision of the approver). , for example, a video display means such as a liquid crystal display, and an audio output means such as a speaker. Specifically, for example, the output unit 24 may display a GUI for accepting input operations from the user.

The storage unit 23 is a nonvolatile data storage such as a hard disk or flash memory, for example. The storage unit 23 stores various data handled by the control unit 22. For example, the storage unit 23 stores image data 23a received from the application device 3 by an image data receiving unit 22a (described later), and approval application information acquired from the first transaction on the blockchain by an approval application information acquisition unit 22b (described later). 23b is stored.

As shown in FIG. 2, the control unit 22 includes an image data reception unit 22a, an approval application information acquisition unit 22b, an image data approval unit 22c, an approval data registration unit 22d, and a second specific information transmission unit 22e. have. Each of these units may be realized by a processor (not shown) in the approval device 2 executing a predetermined program, or may be implemented by hardware.

The image data receiving unit 22a receives image data 23a in which a two-dimensional code is embedded from the application device 3. The received image data 23a is stored in the storage section 23.

The approval application information acquisition unit 22b decodes the two-dimensional code embedded in the image data 23a and extracts the first specific information. Further, the approval application information acquisition unit 22b identifies the first transaction on the blockchain based on the extracted first specific information, and acquires the approval application information 23b from the identified first transaction. If the approval application information 23b stored in the first transaction is encrypted using an encryption key (or common key) depending on the purpose, the approval application information acquisition unit 22b collects the encrypted approval application information. The information 23b is decrypted and obtained using a decryption key (or common key) corresponding to the encryption key. The obtained approval application information 23b is stored in the storage unit 23.

The image data approval unit 22c refers to the approval application information 23b acquired from the first transaction and approves the image data 23a received from the application device 3. Specifically, for example, as shown in FIG. 11, part or all of the approval application information 23b acquired from the first transaction is displayed on the output unit 24. The user using the approval device 2 visually checks the contents of the approval application information 23b displayed on the output unit 24, and touches the confirmation button (the “OK” button shown in FIG. 11) displayed on the output unit 24. By doing so, the image data 23a is approved by the image data approval unit 22c. Note that when the image data approval unit 22c approves the image data 23a, it is not necessarily necessary for the user using the approval device 2 to manually check the content of the approval application information 23b; The image data 23a may be approved by the unit 22c mechanically checking the contents of the approval application information 23b (without any manual checking by the user using the approval device 2).

The approval data registration unit 22d stores approval data including the hash value and first specific information of the image data 23a approved by the image data approval unit 22c, and approval organization information (for example, corporate version My Number (corporate number) for the approval organization). ) information) is stored.

The approval data registration unit 22d transmits the second transaction in which approval data and approval agency information are stored to the blockchain network via the communication unit 21. The second transaction sent to the blockchain network is registered in the blockchain by mining the block containing the transaction at the miner node 8, and a 2 specific information (for example, the hash value or address value of the second transaction) is added. Since the second transaction in which the approval data and approval agency information are stored is registered in the blockchain, the approval data (i.e., data including the hash value of the approved image data 23a and the first specific information) and the approval agency information are stored in the blockchain. It becomes virtually impossible to modify the information after the fact.

The second specific information transmitting unit 22e acquires specific information (second specific information) for specifying a second transaction registered in the blockchain, and transmits the acquired second specific information via a network such as the Internet. It is transmitted to the application device 3. As described above, the second specific information storage unit 32d of the application device 3 stores the second specific information received from the approval device 2 in a file property or a file that does not affect the hash value of the image data 33a in which the two-dimensional code is embedded. Stored in the file name (for example, appended to the end of the file name).

Next, the configuration of the verification device 4 will be described with reference to FIG. 4. FIG. 4 is a block diagram showing a schematic configuration of the verification device 4. As shown in FIG. As the verification device 4, for example, an electronic device such as a mobile terminal such as a smartphone or a tablet terminal, a notebook computer, or a desktop computer is used.

As shown in FIG. 4, the verification device 4 includes a communication section 41, a control section 42, a storage section 43, and an output section 44. The units 41 to 44 are communicably connected to each other via a bus or network.

Among these, the communication unit 41 is a communication interface for connecting the verification device 4 to a network such as the Internet. The communication unit 41 transmits and receives information between the verification device 4 and the nodes 7 and external server 10 that constitute the blockchain network via a network such as the Internet.

The output unit 44 is an interface for outputting various information from the verification device 4 to a user using the verification device 4, and is, for example, a video display means such as a liquid crystal display, or an audio output means such as a speaker. Specifically, for example, the output unit 44 may display a GUI for accepting input operations from the user.

The storage unit 43 is, for example, nonvolatile data storage such as a flash memory. The storage unit 43 stores various data handled by the control unit 42. For example, the storage unit 43 stores image data 43a to be verified and approval application information 43b acquired from the first transaction on the blockchain. The image data 43a to be verified is downloaded from the external server 10 to the verification device 4 and stored in the storage unit 43, for example, when the verification device 4 accesses a web page generated by the external server 10.

As shown in FIG. 4, the control unit 42 includes an approval application information output unit 42a, an approval data acquisition unit 42b, and a modification determination unit 42c. Each of these parts may be realized by a processor in the verification device 4 executing a predetermined program, or may be implemented by hardware.

The approval application information output unit 42a decodes the two-dimensional code embedded in the image data 43a to be verified and extracts the first specific information. Further, the approval application information output unit 42a identifies a first transaction on the blockchain based on the extracted first specific information, and acquires approval application information 43b and approval agency information from the identified first transaction. . If the approval application information 43b stored in the first transaction is encrypted using an encryption key (or common key) depending on the purpose, the approval application information output unit 42a outputs the encrypted approval application information. The information 43b is decrypted and obtained using a decryption key (or common key) corresponding to the encryption key. The approval application information 43b acquired from the first transaction is stored in the storage unit 43.

The approval application information output unit 42a outputs part or all of the approval application information 43a acquired from the first transaction on the blockchain to the output unit 44 (see FIG. 12). By visually checking the approval application information 43b displayed on the output unit 44, the user using the verification device 4 can determine the origin of the image data 43a to be verified (e.g. , which approval agency executed the approval, who applied for approval, when and for what purpose, etc.).

The approval data acquisition unit 42b uses the first specific information extracted from the two-dimensional code embedded in the image data 43a and the approval authority information obtained from the first transaction on the blockchain as a search key, and uses the first identification information extracted from the two-dimensional code embedded in the image data 43a as a search key to obtain the first 2 transactions, and if there is no hit, it is determined that the image data 43a to be verified has been altered, and if there is a hit, approval data (that is, approved by the approval device 2) is retrieved from the hit second transaction. (data including the hash value of the image data and the first specific information) is obtained. By searching for the second transaction on the blockchain using the first specific information and the approval authority information as a search key, for example, when copying image data 43a, the operation of the operating system (OS) etc. can be used to determine the file properties and file name. Even if the transaction is changed without permission, the second transaction registered on the blockchain can be identified and the approval data can be obtained.

The approval data acquisition unit 42b extracts second specific information from the file property or file name of the image data 43a to be verified, and identifies a second transaction on the blockchain based on the extracted second specific information. , approval data (that is, data including the hash value of the image data approved by the approval device 2 and the first specific information) may be obtained from the specified second transaction.

The modification determination unit 42c compares the hash value of the image data 43a to be verified with the hash value included in the approval data acquired from the second transaction on the blockchain, and determines whether the image data 43a to be verified has been modified. Determine the presence or absence of. More specifically, if the hash value of the image data 43a to be verified matches the hash value included in the approval data obtained from the second transaction on the blockchain, the alteration determination unit 42c determines that the image data 43a is to be verified. It is determined that the image data 43a has not been altered, and if they do not match, it is determined that the image data 43a to be verified has been altered.

By confirming that the hash value of the image data 43a to be verified matches the hash value included in the approval data obtained from the second transaction registered on the blockchain, the image data 43a to be verified is verified. has not been altered (for example, the 2D code embedded in the correct image data has not been misused and embedded in another (fake) image data (the 2D code part has not been cut and pasted) )). The determination result as to whether or not the image data 43a to be verified has been altered may be output to the output unit 44.

Next, an example of an information processing method in the information processing system 1 will be described with reference to FIGS. 5 to 8. FIG. 5 is a flowchart showing an example of an image data approval method by the application device 3 and the approval device 2, and FIG. 6 is a flowchart showing an example of an image data verification method by the verification device 4. FIG. 7 is a diagram showing the flow of information in the image data approval method by the application device 3 and the approval device 2, and FIG. 8 is a diagram showing the information flow in the image data verification method by the verification device 4.

First, an example of a method for approving image data by the application device 3 and the approval device 2 will be described with reference to FIGS. 5 and 7. As shown in FIGS. 5 and 7, in the application device 3, image data 33a to be applied for approval and approval application information 33b (see FIG. 10) are prepared and stored in the storage unit 33 in advance. The approval application information registration unit 32a of the application device 3 stores the approval application information 33b stored in the storage unit 33 and the approval institution information (for example, corporate version My Number (corporate number) information about the approval institution). The transaction is transmitted to the blockchain network via the communication unit 31 (step S11). The approval application information registration unit 32a encrypts the approval application information 33b stored in the storage unit 33 using an encryption key (or common key) depending on the purpose, and records the encrypted approval application information 33b and the approval authority. The first transaction in which the information is stored may be transmitted to the blockchain network via the communication unit 31. The first transaction sent to the blockchain network is registered in the blockchain by mining the block containing the transaction at the miner node 8, and the first transaction is registered on the blockchain to identify the first transaction. 1 specific information is added.

After the first transaction is registered in the blockchain, the first specific information storage unit 32b acquires the specific information (first specific information) added to the first transaction, and the two-dimensional Generate code. The two-dimensional code may be a QR code (registered trademark) or a color code that displays information in an array of colors. As shown in FIG. 9, the first specific information storage unit 32b stores a two-dimensional code in which the first specific information is encoded by embedding it in the image data 33a (step S12). The image data 33a in which the two-dimensional code is embedded is stored in the storage unit 33.

Next, the image data transmitter 32c transmits the image data 33a in which the two-dimensional code is embedded to the approval device 2 via a network such as the Internet (step S13). The image data 33a in which the two-dimensional code is embedded is received by the image data receiving section 22a of the approval device 2 and stored in the storage section 23.

Next, the approval application information acquisition unit 22b of the approval device 2 decodes the two-dimensional code embedded in the image data 23a and extracts the first specific information. Then, the approval application information acquisition unit 22b identifies the first transaction on the blockchain based on the extracted first specific information, and acquires the approval application information 23b from the identified first transaction (step S14). If the approval application information 23b stored in the first transaction is encrypted using an encryption key (or common key) depending on the purpose, the approval application information acquisition unit 22b collects the encrypted approval application information. The information 23b is decrypted and obtained using a decryption key (or common key) corresponding to the encryption key. The obtained approval application information 23b is stored in the storage unit 23.

Next, the image data approval unit 22c refers to the approval application information 23b acquired from the first transaction and approves the image data 23a received from the application device 3 (step S15). As shown in FIG. 11, part or all of the approval application information 23b acquired from the first transaction is displayed on the output unit 24, and the user who uses the approval device 2 receives the approval application information 23b displayed on the output unit 24. Even if the image data 23a is approved by the image data approval section 22c by visually confirming the contents of the image data 23a and touching the confirmation button ("OK" button shown in FIG. 11) displayed on the output section 24, Even if the image data 23a is approved by the image data approval unit 22c mechanically checking the content of the approval application information 23b (without any manual checking by the user using the approval device 2), the image data 23a may be approved. good.

Next, the approval data registration unit 22d receives approval data including the hash value and first specific information of the image data 23a approved by the image data approval unit 22c, and approval organization information (for example, the corporate version My Number for the approval organization). (corporate number) information) is transmitted to the blockchain network via the communication unit 21 (step S16). The second transaction sent to the blockchain network is registered in the blockchain by mining the block containing the transaction at the miner node 8, and a 2 Specific information is added.

After the second transaction is registered in the blockchain, the second specific information transmitter 22e acquires the specific information (second specific information) added to the second transaction, and transmits the acquired second specific information to the Internet, etc. is transmitted to the application device 3 via the network (step S17).

Next, the second specific information storage unit 32d of the application device 3 converts the second specific information received from the approval device 2 into image data 33a in which the two-dimensional code is embedded (image data 33a stored in the storage unit 33). is stored in a file property or file name that does not affect the hash value of (step S18). Thereafter, the application device 3 uploads the image data 33a in which the two-dimensional code is embedded to an external server 10 (for example, a server that provides services such as SNS, auction, and flea market) via a network such as the Internet. good. When the image data 33a is uploaded from the application device 3 to the external server 10, the external server 10 generates a web page that displays the uploaded image data 33a. When the verification device 4 accesses the web page, the image data 33a is downloaded from the external server 10 to the verification device 4, and is stored in the storage unit 43 as image data 43a to be verified.

Next, an example of a method for verifying image data by the verification device 4 will be described with reference to FIGS. 6 and 8. As shown in FIGS. 6 and 8, in the verification device 4, the approval application information output unit 42a decodes the two-dimensional code embedded in the image data 43a to be verified and extracts the first specific information. A first transaction on the blockchain is specified based on the first specified information, and approval application information 43b and approval agency information are obtained from the specified first transaction. If the approval application information 43b stored in the first transaction is encrypted using an encryption key (or common key) depending on the purpose, the approval application information output unit 42a outputs the encrypted approval application information. The information 43b is decrypted and obtained using a decryption key (or common key) corresponding to the encryption key. Next, as shown in FIG. 12, the approval application information output unit 42a outputs part or all of the approval application information 43b acquired from the first transaction on the blockchain to the output unit 44 (step S21).

Next, the approval data acquisition unit 42b extracts second specific information from the file properties or file name of the image data 43a to be verified (step S22).

When the second specific information is extracted from the file property or file name of the image data 43a to be verified (step S23: YES), the approval data acquisition unit 42b extracts the second specific information based on the extracted second specific information. A second transaction on the blockchain is identified, and approval data (that is, data including the hash value of the image data approved by the approval device 2 and the first specific information) is obtained from the specified second transaction (step S24 ).

On the other hand, if the second specific information is not extracted from the file property or file name of the image data 43a to be verified (step S23: NO), the approval data acquisition unit 42b extracts the two-dimensional information embedded in the image data 43a. The second transaction on the blockchain is searched using the first specific information extracted from the code and the approval authority information acquired from the first transaction on the blockchain as a search key (step S31).

If the second transaction is a hit (step S32: YES), the approval data acquisition unit 42b extracts the approval data (i.e., the hash value of the image data approved by the approval device 2 and the first specific information) from the hit second transaction. (data including) is acquired (step S33).

On the other hand, if the second transaction does not hit (step S32: NO), the approval data acquisition unit 42b determines that the image data 43a to be verified has been altered (step S28).

After the approval data is acquired from the second transaction on the blockchain in step S24 or step S33, the alteration determination unit 42c adds the hash value of the image data 43a to be verified to the approval data acquired from the second transaction. It is compared with the included hash value (step S25).

If the hash value of the image data 43a to be verified matches the hash value included in the approval data acquired from the second transaction (step S26: YES), the alteration determination unit 42c determines whether the image data 43a to be verified matches the hash value included in the approval data acquired from the second transaction (step S26: YES) It is determined that the data 43a has not been altered (step S27).

On the other hand, if the hash value of the image data 43a to be verified does not match the hash value included in the approval data acquired from the second transaction (step S26: NO), the image data 43a to be verified has been altered. It is determined that it is (step S28).

After determining whether or not the image data 43a to be verified has been altered in step S27 or step S28, the determination result is output to the output unit 44 of the verification device 4, and the user of the verification device 4 is notified.

According to this embodiment as described above, when applying for approval of image data, the first transaction in which the approval application information 33b is stored is registered in the blockchain, so that it is not possible to modify the approval application information 33b after the fact. becomes virtually impossible. Furthermore, since a two-dimensional code in which the specific information of the first transaction (first specific information) is encoded is embedded in the image data 33a, it is possible to easily link and manage the image data 33a and the first specific information. can. When the image data is approved, the first transaction registered on the blockchain is identified based on the first specific information extracted by decoding the two-dimensional code embedded in the image data 23a, and the first transaction is Since the image data 23a is approved by referring to the approval application information 23b acquired from the image data 23a, it is possible to prevent the image data 23a from being erroneously approved based on the approval application information that has been fraudulently altered. Then, since the second transaction in which the approval data including the hash value of the approved image data 23a and the first specific information is stored is registered in the blockchain, the approval data indicating approval is modified after the fact. It becomes virtually impossible to do so. This makes it possible to guarantee that the image data has been approved by the approval organization. That is, for example, when verifying the source of image data, the first transaction on the blockchain is identified based on the first specific information extracted by decoding the two-dimensional code embedded in the image data 43a to be verified. Approval agency information is obtained from the identified first transaction, a second transaction on the blockchain is searched using the first specific information and approval agency information as a search key, and approval data is obtained from the second transaction that is hit. By confirming that the hash value of the image data 43a to be verified matches the hash value included in the approval data obtained from the second transaction on the blockchain, the image data 43a to be verified is verified. It can be guaranteed that the image data has not been altered (i.e., that the image data has been approved by the approval authority). Further, for example, the first transaction on the blockchain is identified based on the first specific information extracted by decoding the two-dimensional code embedded in the image data 43a to be verified, and from the identified first transaction. By outputting the obtained approval application information 43b to the output unit 44, it is possible to determine the origin of the image data 43a to be verified (for example, which approval organization executed the approval) based on the contents of the approval application information 43b. , who applied for approval, when and for what purpose, etc.).

Specifically, for example, when Mr. A (=application applicant) takes a photo (=image data 33a subject to approval application) with a smartphone (=application device 3) to commemorate visiting a tourist spot, The local government that manages the tourist spot (= approval device 2 (approval authority using the It is referred to when the local government that manages the tourist spot (= the approval agency using the approval device 2) approves the photo (= image data 23a) received from Mr. A (= the approval applicant). Since the approval application information 23b is registered on the blockchain, if Mr. A (=approval applicant) uploads the photo (=image data) to SNS (=external server 10), he can visit the tourist destination. Even if an image is downloaded from an SNS (external server 10) by Mr. B who did not visit the site and is used illegally as if Mr. B visited a tourist spot and took the photo, a third party who viewed the photo ( = User of the verification device 4) uses the two-dimensional code embedded in the photo as a clue to check the approval application information 43b registered on the blockchain, and determines the region where Mr. A manages the tourist spot. It is easy to recognize that the photo was approved by the local government and that Mr. B did not have permission to use it and that the use was unauthorized.

Also, for example, a photo of a certain product (= image data 33a) was taken by Company C (= approval applicant), which is an official retailer of the product, for use on an EC site or a product introduction site. This fact (=approval application information 33b) can be certified by the brand manufacturer (=approval organization using the approval device 2) that is the manufacturer of the product. When the brand manufacturer (=approval organization using approval device 2) that is the manufacturer of the product approves the photo (=image data 23a) received from Company C (=approval applicant), which is an authorized retailer, Since the referenced approval application information 23b is registered on the blockchain, Company C (=approval applicant) uploaded the photo (=image data) to the EC site or product introduction site (=external server 10). In this case, the purchaser of the product (=user of the verification device 4) uses the two-dimensional code embedded in the photo posted on the EC site or product introduction site (=external server 10) as a clue, and uses the information on the blockchain as a clue. By checking the registered approval application information 43b, it is easy to recognize that the photo has been approved by the brand manufacturer, which is the manufacturer, of Company C, which operates the EC site or product introduction site. Can be done. In this case, if Company D, which sells bulk products with no product warranty, obtains images of the product from an e-commerce site or product introduction site operated by Company C, which is an authorized retailer, and uses an auction site operated by Company D, etc. Even if it is fraudulently posted and used on the auction site, the purchaser (= user of verification device 4) will register it on the blockchain using the 2D code embedded in the photo posted on the auction site as a clue. By checking the approval application information 43b, it can be easily determined that the photo has been approved by Company C from the brand manufacturer, and that Company D, which operates the auction site, does not have the authority to use the photo and is using it fraudulently. can be recognized.

For example, if Mr. E (= approval applicant) creates electronic data such as a receipt or contract (= image data 33a that is subject to an approval application), the By using the two-dimensional code instead of a stamp, it is possible to confirm that the stamp tax has been paid on receipts, contracts, etc. (= image data 33a) by the government, etc. (= approval using the approval device 2). institution) can certify. It is referred to when the government (= approving agency using the approval device 4) approves electronic data (= image data 33a) such as receipts and contracts received from Mr. E (= approval applicant). Since the approval application information 23b (for example, the name of the applicant for approval and the date and time of stamp tax payment) is registered on the blockchain, Mr. F, who received a receipt or contract from Mr. E, can Even if an attempt was made to illegally use the two-dimensional code embedded in a document by cutting it out and pasting it on another receipt or contract, the third party who received the receipt or contract from Mr. F. =User of the verification device 4) uses the two-dimensional code embedded in the receipt or contract as a clue to check the approval application information 43b registered on the blockchain, and verifies the two-dimensional code. , is a two-dimensional code that should be embedded in receipts and contracts that Mr. E has received approval from the government, and Mr. F does not have the authority to use it, making it easy to recognize that it is being used illegally. .

Further, according to the present embodiment, when copying image data (for example, downloading image data from external server 10 to verification device 4), file properties and file Even if the name has been changed without permission, when verifying whether or not the image data 43a has been altered, the first identification extracted by decoding the two-dimensional code embedded in the target image data 43a. A first transaction on the blockchain is identified based on the information, approval authority information is acquired from the identified first transaction, and a second transaction on the blockchain is retrieved using the first identification information and approval authority information as a search key. Through the search, the second transaction registered on the blockchain is identified, and based on the hash value included in the approval data obtained from the second transaction, the target image data 43a is not altered. I can guarantee that.

Further, according to the present embodiment, when image data is approved, the specific information of the second transaction (second specific information) is stored in the file property or file name of the image data 33a, so that the image data 33a and The second specific information can be easily linked and managed. When verifying whether or not the image data has been altered, a second transaction on the blockchain is identified based on the second specific information extracted from the file properties or file name of the image data 43a to be verified, and the second transaction is identified. Approval data is obtained from the second transaction, and it is confirmed that the hash value of the image data 43a to be verified matches the hash value included in the approval data obtained from the second transaction on the blockchain. By doing so, it can be guaranteed that the image data 43a to be verified has not been altered (that is, that the image data has been approved by the approval organization).

Although one embodiment has been described in detail above, the present invention is not limited to the embodiment described above, and various modifications can be made to the embodiment described above. Hereinafter, an example of the modification will be described with reference to the drawings. In the following description and the drawings used in the following description, the same reference numerals as those used for corresponding parts in the above-described embodiment are used for parts that can be configured similarly to the above-described embodiment, and the same reference numerals are used for the corresponding parts in the above-described embodiment. Omit the explanation.

(First modification)
A first modification of the embodiment will be described with reference to FIGS. 13 to 19. FIG. 13 is a diagram showing a schematic block configuration of the approval device 2 according to the first modification, and FIG. 14 is a diagram showing a schematic block configuration of the application device 3 according to the first modification. 15 is a diagram showing a schematic block configuration of the verification device 4 according to the first modification.

First, the configuration of the application device 3 according to the first modification will be described. As shown in FIG. 14, in the first modification, the control section 32 of the application device 3 includes an approval application information registration section 32a, a first specific information storage section 32b, an image data transmission section 32c, and a second specific information storage section 32b. It has an information storage section 32d and an image data registration section 32e. Among these, the configurations of the approval application information registration section 32a, the first specific information storage section 32b, and the second specific information storage section 32d are the same as those in the above-described embodiment, and a description thereof will be omitted.

The image data registration unit 32e stores the image data 33a in which the two-dimensional code is embedded after the first specific information storage unit 32b embeds the two-dimensional code in which the first specific information is encoded into the image data. and transmits the third transaction to the blockchain network via the communication unit 31. The image data registration unit 32e encrypts the image data 33a in which the two-dimensional code is embedded using an encryption method according to the purpose (for example, a common key encryption method such as AES), and stores the encrypted image data 33a. The third transaction may be transmitted to the blockchain network via the communication unit 31. In this case, even if a public blockchain is used, the image data 33a registered on the blockchain may be viewed by a specific person (for example, an approval authority or a verification device 4) who has the key to decrypt it. (users who use the service). The third transaction sent to the blockchain network is registered in the blockchain by mining the block containing the transaction at the miner node 8, and a third transaction is sent to the blockchain network to identify the third transaction. 3 specific information (for example, the hash value and address value of the third transaction) is added. Since the third transaction in which the image data 33a in which the two-dimensional code is embedded is stored is registered in the blockchain, it becomes substantially impossible to modify the image data 33a after the fact.

The image data transmitter 32c transmits the image data 33a in which the two-dimensional code is embedded and specific information (third specific information) for specifying the third transaction registered in the blockchain via a network such as the Internet. and sends it to the approval device 2.

Next, the configuration of the approval device 2 according to the first modification will be explained. As shown in FIG. 13, in the first modification, the control unit 22 of the approval device 2 includes an image data reception unit 22a, an approval application information acquisition unit 22b, an image data approval unit 22c, and an approval data registration unit 22d. , a second specific information transmission section 22e, and an image data acquisition section 22f. Among these, the configurations of the approval application information acquisition section 22b and the second specific information transmission section 22e are the same as those in the embodiment described above, and a description thereof will be omitted.

The image data receiving unit 22a receives the image data 23a in which the two-dimensional code is embedded and the third specific information from the application device 3. The image data 23a received from the application device 3 is stored in the storage unit 23.

The image data acquisition unit 22f identifies a third transaction on the blockchain based on the third identification information received from the application device 3, and acquires image data 23c from the identified third transaction. When the image data 23c stored in the third transaction is encrypted using an encryption key (or common key) depending on the purpose, the image data acquisition unit 22f stores the encrypted image data 23c. Decrypt and obtain the encryption key using the decryption key (or common key) corresponding to the encryption key. The image data 23c acquired from the third transaction is stored in the storage unit 23 separately from the image data 23a received from the application device 3.

The image data approval unit 22c approves the image data 23a received from the application device 3 by referring to the approval application information 23b obtained from the first transaction and the image data 23c obtained from the third transaction. Specifically, for example, part or all of the approval application information 23b acquired from the first transaction and the image data 23c acquired from the third transaction are displayed on the output unit 24. A user using the approval device 2 visually checks the contents of the approval application information 23b displayed on the output unit 24 and the image data 23c (obtained from the third transaction), and presses the confirmation button displayed on the output unit 24. By touching, the image data approval unit 22c may approve the image data 23a (obtained from the application device 3), or the image data approval unit 22c may approve the approval application information 23b (obtained from the third transaction). ) The image data 23a acquired from the application device 3 may be approved by mechanically checking the contents of the image data 23c (without any manual checking by the user using the approval device 2).

The approval data registration unit 22d stores approval data including a hash value, first specific information, and third specific information of the image data 23a approved by the image data approval unit 22c, and approval organization information (for example, a corporate version of the approval organization). A second transaction in which My Number (corporate number information) is stored is generated and transmitted to the blockchain network via the communication unit 21. The second transaction sent to the blockchain network is registered in the blockchain by mining the block containing the transaction at the miner node 8, and a 2 specific information (for example, the hash value or address value of the second transaction) is added. Since the second transaction in which the approval data and approval agency information are stored is registered in the blockchain, the approval data (i.e., data including the hash value of the approved image data 23a, the first specific information, and the third specific information) ) and the approval agency information after the fact is virtually impossible.

Next, the configuration of the verification device 4 according to the first modification will be described. As shown in FIG. 15, in the first modification, the control unit 42 of the verification device 4 includes an approval application information output unit 42a, an approval data acquisition unit 42b, a modification determination unit 42c, and an image data output unit 42d. have. Among these, the configurations of the approval/approval application information output section 42a, the approval data acquisition section 42b, and the alteration determination section 42c are the same as those in the embodiment described above, and the explanation thereof will be omitted.

After the approval data acquisition unit 42b acquires approval data from the second transaction on the blockchain, the image data output unit 42d outputs the third transaction on the blockchain based on the third specific information included in the approval data. The image data 43c is acquired from the specified third transaction. If the image data 43c stored in the third transaction is encrypted using an encryption key (or common key) depending on the purpose, the image data output unit 42d outputs the encrypted image data 43c. Decrypt and obtain the encryption key using the decryption key (or common key) corresponding to the encryption key. The image data 43c acquired from the third transaction is stored in the storage unit 43 separately from the image data 43a to be verified.

The image data output unit 42d outputs image data 43c acquired from the third transaction on the blockchain to the output unit 44. By visually checking the image data 43c (obtained from the third transaction) displayed on the output unit 44, the user using the verification device 4 can confirm that the image data 43a to be verified is registered on the blockchain. It becomes possible to intuitively confirm that the image data 43c matches the existing image data 43c.

Next, an example of an information processing method in the information processing system 1 according to the first modification will be described with reference to FIGS. 16A to 19. 16A and 16B are flowcharts showing an example of an image data approval method by the application device 3 and the approval device 2 according to the first modification, and FIG. 3 is a flowchart illustrating an example of a method for verifying image data. FIG. 18 is a diagram showing the flow of information in the image data approval method by the application device 3 and the approval device 2 according to the first modification, and FIG. FIG. 3 is a diagram showing the flow of information in a data verification method.

First, an example of a method for approving image data by the application device 3 and the approval device 2 according to the first modification will be described with reference to FIGS. 16A, 16B, and 18. In the first modification, the approval application information registration unit 32a of the application device 3 transmits the first transaction in which the approval application information 33b and the approval institution information are stored to the blockchain network, and the first specific information The process up to the step in which the storage unit 32b embeds and stores the two-dimensional code in which the first specific information is encoded in the image data 33a (steps S11 to S12) is the same as in the embodiment described above (see FIGS. 5 and 7). It is the same, and the explanation will be omitted.

As shown in FIGS. 16A and 18, in the first modification, after a two-dimensional code in which the first specific information is encoded is embedded and stored in the image data 33a (after step S12), the image data The registration unit 32e transmits the third transaction in which the image data 33a in which the two-dimensional code is embedded is stored to the blockchain network via the communication unit 31 (step S41). Note that the image data registration unit 32e encrypts the image data 33a in which the two-dimensional code is embedded using an encryption key (or common key) depending on the purpose, and stores the image data 33a in the third The transaction may be sent to the blockchain network via the communication unit 31. The third transaction sent to the blockchain network is registered in the blockchain by mining the block containing the transaction at the miner node 8, and a third transaction is sent to the blockchain network to identify the third transaction. 3 specific information (for example, the hash value and address value of the third transaction) is added.

After the third transaction is registered in the blockchain, the image data transmitting unit 32c sends the image data 33a in which the two-dimensional code is embedded and the third specific information added to the third transaction to a network such as the Internet. The information is transmitted to the approval device 2 via the host computer (step S42). The image data 33a in which the two-dimensional code is embedded and the third specific information are received by the image data receiving section 22a of the approval device 2 and stored in the storage section 23.

Next, in the approval device 2, the approval application information acquisition unit 22b decodes the two-dimensional code embedded in the image data 23a received from the application device 3 and extracts the first specific information. Then, the approval application information acquisition unit 22b identifies the first transaction on the blockchain based on the extracted first specific information, and acquires the approval application information 23b from the identified first transaction (step S43). The obtained approval application information 23b is stored in the storage unit 23.

Furthermore, the image data acquisition unit 22f identifies a third transaction on the blockchain based on the third specific information received from the application device 3, and acquires image data 23c from the identified third transaction (step S44). . When the image data 23c stored in the third transaction is encrypted using an encryption key (or common key) depending on the purpose, the image data acquisition unit 22f stores the encrypted image data 23c. Decrypt and obtain the encryption key using the decryption key (or common key) corresponding to the encryption key. The image data 23c acquired from the third transaction is stored in the storage unit 23 separately from the image data 23a received from the application device 3. Note that step S44 may be performed before step S43.

Next, the image data approval unit 22c refers to the approval application information 23b obtained from the first transaction and the image data 23c obtained from the third transaction, and approves the image data 23a received from the application device 3. (Step S45). Specifically, for example, part or all of the approval application information 23b acquired from the first transaction and the image data 23c acquired from the third transaction are displayed on the output unit 24, and the user using the approval device 2 , visually confirm the contents of the approval application information 23b displayed on the output section 24 and the image data 23c (obtained from the third transaction), and touch the confirmation button displayed on the output section 24 to approve the image data. The image data 23a (obtained from the application device 3) may be approved by the image data approval section 22c, or the image data approval section 22c may machine the approval application information 23b and the contents of the image data 23c (obtained from the third transaction). Approval of the image data 23a obtained from the application device 3 may be executed by checking the image data 23a acquired from the application device 3 (without any manual check by the user using the approval device 2).

Next, as shown in FIGS. 16B and 18, the approval data registration unit 22d generates approval data including the hash value, first specific information, and third specific information of the image data 23a approved by the image data approval unit 22c. and the approval institution information (for example, corporate version My Number (corporate number) information regarding the approval institution) are transmitted to the blockchain network via the communication unit 21 (step S46). The second transaction sent to the blockchain network is registered in the blockchain by mining the block containing the transaction at the miner node 8, and a 2 Specific information is added.

After the second transaction is registered in the blockchain, the second specific information transmitter 22e acquires the specific information (second specific information) added to the second transaction, and transmits the acquired second specific information to the Internet, etc. is transmitted to the application device 3 via the network (step S47).

Next, the second specific information storage unit 32d of the application device 3 converts the second specific information received from the approval device 2 into image data 33a in which the two-dimensional code is embedded (image data 33a stored in the storage unit 33). is stored in a file property or file name that does not affect the hash value of (step S48). Thereafter, the application device 3 uploads the image data 33a in which the two-dimensional code is embedded to an external server 10 (for example, a server that provides services such as SNS, auction, and flea market) via a network such as the Internet. good. When the image data 33a is uploaded from the application device 3 to the external server 10, the external server 10 generates a web page that displays the uploaded image data 33a. When the verification device 4 accesses the web page, the image data 33a is downloaded from the external server 10 to the verification device 4, and is stored in the storage unit 43 as image data 43a to be verified.

Next, an example of a method for verifying image data by the verification device 4 according to the first modification will be described with reference to FIGS. 17 and 19. In the first modification, the approval application information output unit 42a of the verification device 4 decodes the two-dimensional code embedded in the image data 43a to be verified, extracts the first specific information, and extracts the first specific information. The first transaction on the blockchain is specified based on the specific information, the approval application information 43b and the approval agency information are acquired from the specified first transaction, and part or all of the obtained approval application information 43a is output to the output unit. 44 to the step in which the modification determination unit 42c determines that the image data 43a to be verified has not been modified (step 27) is the same as in the embodiment described above (see FIGS. 6 and 8). It is the same, and the explanation will be omitted.

As shown in FIGS. 17 and 19, in the first modification, after the alteration determination unit 42c determines that the image data 43a to be verified has not been altered (step S27), the image data output unit 42d , a third transaction on the blockchain is specified based on the third specific information included in the approval data obtained from the second transaction on the blockchain, and image data 43c is obtained from the specified third transaction. If the image data 43c stored in the third transaction is encrypted using an encryption key (or common key) depending on the purpose, the image data output unit 42d outputs the encrypted image data 43c. Decrypt and obtain the encryption key using the decryption key (or common key) corresponding to the encryption key. The image data 43c acquired from the third transaction is stored in the storage unit 43 separately from the image data 43a to be verified.

The image data output unit 42d then outputs the image data 43c acquired from the third transaction on the blockchain to the output unit 44 (step S29).

According to the first modification example described above, when applying for approval of image data, the first transaction in which the approval application information 33b is stored is registered in the blockchain, as in the embodiment described above, so that the approval is not processed. It becomes virtually impossible to modify the application information 33b after the fact. Furthermore, since a two-dimensional code in which the specific information of the first transaction (first specific information) is encoded is embedded in the image data 33a, it is possible to easily link and manage the image data 33a and the first specific information. can. Furthermore, since the third transaction in which the image data 33a in which the two-dimensional code is embedded is stored in the blockchain, it is virtually impossible to modify the image data 33a in which the two-dimensional code is embedded after the fact. It becomes possible. When the image data is approved, the first transaction registered on the blockchain is identified based on the first specific information extracted by decoding the two-dimensional code embedded in the image data 23a received from the application device 3. At the same time, the third transaction registered on the blockchain is identified based on the third identification information received from the application device 3, and the approval application information acquired from the first transaction and the image acquired from the third transaction are identified. Since the image data 23a received from the application device 3 is approved by referring to the data 23c, it is possible to prevent the image data 23a from being erroneously approved based on illegally altered approval application information or image data. be done. Then, since the second transaction in which the approval data including the hash value of the approved image data 23a, the first specific information, and the third specific information is stored is registered in the blockchain, the approval data indicating that the image data 23a has been approved is registered. It becomes virtually impossible to modify it after the fact. This makes it possible to guarantee that the image data has been approved by the approval organization. That is, for example, when verifying whether or not image data has been altered, similarly to the above embodiment, the first specific information extracted by decoding the two-dimensional code embedded in the image data 43a to be verified is A first transaction on the blockchain is identified based on the identified first transaction, approval authority information is obtained from the identified first transaction, and a second transaction on the blockchain is searched using the first identification information and approval authority information as a search key. , it is confirmed that the approval data is obtained from the second transaction that has been hit, and the hash value of the image data 43a to be verified matches the hash value included in the approval data obtained from the second transaction on the blockchain. By doing so, it can be guaranteed that the image data 43a to be verified has not been altered (that is, that the image data has been approved by the approval organization). Furthermore, for example, by outputting the approval application information obtained from the identified first transaction to the output unit, it is possible to confirm the source of the image data to be verified based on the content of the approval application information. can. Furthermore, a third transaction on the blockchain is specified based on the third specific information included in the approval data, and image data 43c is acquired from the specified third transaction and output to the output unit 44, thereby verifying the data. The user can intuitively confirm that the target image data 43a matches the image data 43c registered on the blockchain.

Note that the descriptions of the embodiments and individual modifications described above and the disclosure of the drawings are merely examples for explaining the invention described in the claims, and the disclosures of the embodiments and individual modifications described above are merely examples for explaining the invention described in the claims. The invention described in the claims is not limited by the disclosure of the description or drawings. The components of the embodiments and individual modifications described above can be combined as desired without departing from the spirit of the invention.

Further, although the recording device and the determination device according to the embodiments described above may be configured by a computer system, a program for realizing the recording device and the determination device in the computer system and the program can be implemented non-transitory. Computer-readable recording media on which such information is recorded are also subject to protection in this case.

1 Information processing system 2 Approval device 21 Communication unit 22 Control unit 22a Image data reception unit 22b Approval application information acquisition unit 22c Image data approval unit 22d Approval data registration unit 22e Second specific information transmission unit 22f Image data acquisition unit 23 Storage unit 23a Image data received from the application device 23b Approval application information obtained from the first transaction on the blockchain 23c Image data 24 obtained from the third transaction on the blockchain Output section 3 Application device 31 Communication section 32 Control section 32a Approval application information Registration section 32b First specific information storage section 32c Image data transmission section 32d Second specific information storage section 32e Image data registration section 33 Storage section 33a Image data 33b Approval application information 34 Output section 4 Verification device 41 Communication section 42 Control section 42a Approval Application information output section 42b Modification determination section 42c Image data output section 43 Storage section 43a Image data to be verified 43b Approval application information obtained from the first transaction on the blockchain 43c Image data 44 obtained from the third transaction on the blockchain Output section 5 to 9 Node 10 External server

Claims (30)

an approval device that approves image data;
an application device that applies to the approval device for approval of image data;
Equipped with
The application device is
an approval application information registration unit that sends a first transaction in which approval application information and approval agency information are stored to a blockchain network;
a first specific information storage unit that stores a two-dimensional code in which first specific information for specifying the first transaction registered in the blockchain is encoded, embedded in image data;
an image data transmitter that transmits image data in which the two-dimensional code is embedded to an approval device;
has
The approval device includes:
an image data receiving unit that receives image data in which a two-dimensional code is embedded from the application device;
An approval application that identifies a first transaction on the blockchain based on first specific information extracted by decoding a two-dimensional code embedded in the image data, and obtains approval application information from the identified first transaction. Information acquisition department;
an image data approval unit that refers to the approval application information and approves the image data;
an approval data registration unit that transmits a second transaction in which approval data including a hash value of the approved image data and the first specific information and approval agency information are stored to a blockchain network;
has,
An information processing system characterized by: an approval device that approves image data;
an application device that applies to the approval device for approval of image data;
Equipped with
The application device is
an approval application information registration unit that sends a first transaction in which approval application information and approval agency information are stored to a blockchain network;
a first specific information storage unit that stores a two-dimensional code in which first specific information for specifying the first transaction registered in the blockchain is encoded, embedded in image data;
an image data registration unit that transmits a third transaction in which image data in which the two-dimensional code is embedded is stored to a blockchain network;
an image data transmission unit that transmits image data in which the two-dimensional code is embedded and third identification information for identifying the third transaction registered in a blockchain to an approval device;
has
The approval device includes:
an image data receiving unit that receives image data embedded with a two-dimensional code and third specific information from the application device;
The first transaction on the blockchain is identified based on the first specific information extracted by decoding the two-dimensional code embedded in the image data received from the application device, and approval application information is obtained from the identified first transaction. an approval application information acquisition unit that acquires the
an image data acquisition unit that identifies a third transaction on the blockchain based on third specific information received from the application device and acquires image data from the identified third transaction;
an image data approval unit that approves the image data received from the application device by referring to the approval application information obtained from the first transaction and the image data obtained from the third transaction;
an approval data registration unit that transmits a second transaction in which approval data including a hash value of the approved image data, the first specific information, and the third specific information and approval agency information are stored to a blockchain network; ,
has,
An information processing system characterized by: The approval device includes:
further comprising a second specific information transmitting unit that transmits second specific information for specifying a second transaction registered in the blockchain to the application device,
The application device is
further comprising a second specific information storage unit that stores the second specific information received from the approval device in a file property or file name that does not affect the hash value of the image data in which the two-dimensional code is embedded;
The information processing system according to claim 1 or 2, characterized in that: It is further equipped with a verification device that verifies whether or not the image data has been altered.
The verification device includes:
The first transaction on the blockchain is identified based on the first specific information extracted by decoding the two-dimensional code embedded in the image data to be verified, and approval application information and approval are obtained from the identified first transaction. an approval application information output unit that acquires institutional information and outputs the approval application information to an output unit;
A second transaction on the blockchain is searched using the first specific information and the approval authority information as a search key, and if there is no hit, it is determined that the image data to be verified has been altered, and if a hit is found. an approval data acquisition unit that acquires approval data from the hit second transaction;
a modification determination unit that compares the hash value of the image data to be verified with the hash value included in the approval data obtained from the second transaction on the blockchain to determine whether or not the image data to be verified has been modified; and,
has,
The information processing system according to any one of claims 1 to 3, characterized in that: It is further equipped with a verification device that verifies whether or not the image data has been altered.
The verification device includes:
Identify the first transaction on the blockchain based on the first specific information extracted by decoding the two-dimensional code embedded in the image data to be verified, and obtain approval application information from the identified first transaction. and an approval application information output unit that outputs the approval application information to an output unit;
Approval data acquisition that identifies a second transaction on the blockchain based on second specific information extracted from the file property or file name of the image data to be verified, and acquires approval data from the identified second transaction. Department and
a modification determination unit that compares the hash value of the image data to be verified with the hash value included in the approval data obtained from the second transaction on the blockchain to determine whether or not the image data to be verified has been modified; and,
has,
The information processing system according to claim 3, characterized in that: The verification device includes:
A third transaction on the blockchain is specified based on the third specific information included in the approval data obtained from the second transaction on the blockchain, and image data is obtained from the specified third transaction and sent to the output section. further comprising an image data output unit to output the image data;
The information processing system according to claim 4 or 5, which refers to claim 2. An application device that applies to an approval device for approval of image data, the application device comprising:
an approval application information registration unit that sends a first transaction in which approval application information and approval agency information are stored to a blockchain network;
a first specific information storage unit that stores a two-dimensional code in which first specific information for specifying the first transaction registered in the blockchain is encoded, embedded in image data;
an image data transmitter that transmits image data in which the two-dimensional code is embedded to an approval device;
An application device characterized by comprising: An approval device that approves image data,
an image data receiving unit that receives image data in which the two-dimensional code is embedded from the application device;
An approval application that identifies a first transaction on the blockchain based on first specific information extracted by decoding a two-dimensional code embedded in the image data, and obtains approval application information from the identified first transaction. Information acquisition department;
an image data approval unit that refers to the approval application information and approves the image data;
an approval data registration unit that transmits a second transaction in which approval data including a hash value of the approved image data and the first specific information and approval agency information are stored to a blockchain network;
An approval device characterized by comprising: A verification device for verifying whether or not image data has been altered,
The first transaction on the blockchain is identified based on the first specific information extracted by decoding the two-dimensional code embedded in the image data to be verified, and approval application information and approval are obtained from the identified first transaction. an approval application information output unit that acquires institutional information and outputs the approval application information to an output unit;
A second transaction on the blockchain is searched using the first specific information and the approval authority information as a search key, and if there is no hit, it is determined that the image data to be verified has been altered, and if a hit is found. an approval data acquisition unit that acquires approval data from the hit second transaction;
a modification determination unit that compares the hash value of the image data to be verified with the hash value included in the approval data obtained from the second transaction on the blockchain to determine whether or not the image data to be verified has been modified; and,
A verification device characterized by comprising: An application device that applies to an approval device for approval of image data, the application device comprising:
an approval application information registration unit that sends a first transaction in which approval application information and approval agency information are stored to a blockchain network;
a first specific information storage unit that stores a two-dimensional code in which first specific information for specifying the first transaction registered in the blockchain is encoded, embedded in image data;
an image data registration unit that transmits a third transaction in which image data in which the two-dimensional code is embedded is stored to a blockchain network;
an image data transmission unit that transmits image data in which the two-dimensional code is embedded and third identification information for identifying the third transaction registered in a blockchain to an approval device;
An application device characterized by comprising: An approval device that approves image data,
an image data receiving unit that receives image data embedded with a two-dimensional code and third specific information from the application device;
The first transaction on the blockchain is identified based on the first specific information extracted by decoding the two-dimensional code embedded in the image data received from the application device, and approval application information is obtained from the identified first transaction. an approval application information acquisition unit that acquires the
an image data acquisition unit that identifies a third transaction on the blockchain based on third specific information received from the application device and acquires image data from the identified third transaction;
an image data approval unit that approves the image data by referring to the approval application information obtained from the first transaction and the image data obtained from the third transaction;
an approval data registration unit that transmits a second transaction in which approval data including a hash value of the approved image data, the first specific information, and the third specific information and approval agency information are stored to a blockchain network; ,
An approval device characterized by comprising: A verification device for verifying whether or not image data has been altered,
The first transaction on the blockchain is identified based on the first specific information extracted by decoding the two-dimensional code embedded in the image data to be verified, and approval application information and approval are obtained from the identified first transaction. an approval application information output unit that acquires institutional information and outputs the approval application information to an output unit;
A second transaction on the blockchain is searched using the first specific information and the approval authority information as a search key, and if there is no hit, it is determined that the image data to be verified has been altered, and if a hit is found. an approval data acquisition unit that acquires approval data from the hit second transaction;
a modification determination unit that compares the hash value of the image data to be verified with the hash value included in the approval data obtained from the second transaction on the blockchain to determine whether or not the image data to be verified has been modified; and,
A third transaction on the blockchain is specified based on the third specific information included in the approval data obtained from the second transaction on the blockchain, and image data is obtained from the specified third transaction and sent to the output section. an image data output section to output;
A verification device characterized by comprising: An information processing method executed by a computer that requests approval of image data from an approval device, the method comprising:
an approval application information registration step of transmitting a first transaction in which approval application information and approval agency information are stored to a blockchain network;
a first specific information storage step of embedding and storing a two-dimensional code encoded with first specific information for specifying the first transaction registered in the blockchain in image data;
an image data transmitting step of transmitting the image data in which the two-dimensional code is embedded to an approval device;
An information processing method characterized by comprising: An information processing method executed by a computer that approves image data, the method comprising:
an image data receiving step of receiving image data in which the two-dimensional code is embedded from the application device;
An approval application that identifies a first transaction on the blockchain based on first specific information extracted by decoding a two-dimensional code embedded in the image data, and obtains approval application information from the identified first transaction. an information acquisition step;
an image data approval unit that refers to the approval application information and approves the image data;
an approval data registration step of transmitting a second transaction in which approval data including a hash value of the approved image data and the first specific information and approval agency information are stored to a blockchain network;
An information processing method characterized by comprising: An information processing method executed by a computer for verifying whether image data has been altered, the method comprising:
The first transaction on the blockchain is identified based on the first specific information extracted by decoding the two-dimensional code embedded in the image data to be verified, and approval application information and approval are obtained from the identified first transaction. an approval application information output step of acquiring institutional information and outputting the approval application information to an output unit;
A second transaction on the blockchain is searched using the first specific information and the approval authority information as a search key, and if there is no hit, it is determined that the image data to be verified has been altered, and if a hit is found. includes an approval data acquisition step of obtaining approval data from the second hit transaction;
A modification determination step of comparing the hash value of the image data to be verified with the hash value included in the approval data obtained from the second transaction on the blockchain to determine whether or not the image data to be verified has been modified. and,
An information processing method characterized by comprising: An information processing method executed by a computer that requests approval of image data from an approval device, the method comprising:
an approval application information registration step of transmitting a first transaction in which approval application information and approval agency information are stored to a blockchain network;
a first specific information storage step of embedding and storing a two-dimensional code encoded with first specific information for specifying the first transaction registered in the blockchain in image data;
an image data registration step of transmitting a third transaction in which image data in which the two-dimensional code is embedded is stored to a blockchain network;
an image data transmitting step of transmitting image data in which the two-dimensional code is embedded and third specifying information for specifying the third transaction registered in the blockchain to an approval device;
An information processing method characterized by comprising: An information processing method executed by a computer that approves image data, the method comprising:
an image data receiving step of receiving image data embedded with a two-dimensional code and third specific information from the application device;
The first transaction on the blockchain is identified based on the first specific information extracted by decoding the two-dimensional code embedded in the image data received from the application device, and approval application information is obtained from the identified first transaction. an approval application information acquisition step for acquiring the
an image data acquisition step of identifying a third transaction on the blockchain based on third identification information received from the application device and acquiring image data from the identified third transaction;
an image data approval step of approving the image data by referring to the approval application information obtained from the first transaction and the image data obtained from the third transaction;
an approval data registration step of transmitting a second transaction in which approval data including a hash value of the approved image data, the first specific information, and the third specific information and approval agency information are stored to a blockchain network; ,
An information processing method characterized by comprising: An information processing method executed by a computer for verifying whether image data has been altered, the method comprising:
The first transaction on the blockchain is identified based on the first specific information extracted by decoding the two-dimensional code embedded in the image data to be verified, and approval application information and approval are obtained from the identified first transaction. an approval application information output step of acquiring institutional information and outputting the approval application information to an output unit;
A second transaction on the blockchain is searched using the first specific information and the approval authority information as a search key, and if there is no hit, it is determined that the image data to be verified has been altered, and if a hit is found. includes an approval data acquisition step of obtaining approval data from the second hit transaction;
A modification determination step of comparing the hash value of the image data to be verified with the hash value included in the approval data obtained from the second transaction on the blockchain to determine whether or not the image data to be verified has been modified. and,
A third transaction on the blockchain is specified based on the third specific information included in the approval data obtained from the second transaction on the blockchain, and image data is obtained from the specified third transaction and sent to the output section. an image data output step;
An information processing method characterized by comprising: The computer that requests image data approval from the approval device.
an approval application information registration step of transmitting a first transaction in which approval application information and approval agency information are stored to a blockchain network;
a first specific information storage step of embedding and storing a two-dimensional code encoded with first specific information for specifying the first transaction registered in the blockchain in image data;
an image data transmitting step of transmitting the image data in which the two-dimensional code is embedded to an approval device;
An information processing program that executes. The computer that approves the image data
an image data receiving step of receiving image data in which the two-dimensional code is embedded from the application device;
An approval application that identifies a first transaction on the blockchain based on first specific information extracted by decoding a two-dimensional code embedded in the image data, and obtains approval application information from the identified first transaction. an information acquisition step;
an image data approval unit that refers to the approval application information and approves the image data;
an approval data registration step of transmitting a second transaction in which approval data including a hash value of the approved image data and the first specific information and approval agency information are stored to a blockchain network;
An information processing program that executes. A computer that verifies whether the image data has been altered,
The first transaction on the blockchain is identified based on the first specific information extracted by decoding the two-dimensional code embedded in the image data to be verified, and approval application information and approval are obtained from the identified first transaction. an approval application information output step of acquiring institutional information and outputting the approval application information to an output unit;
A second transaction on the blockchain is searched using the first specific information and the approval authority information as a search key, and if there is no hit, it is determined that the image data to be verified has been altered, and if a hit is found. includes an approval data acquisition step of obtaining approval data from the second hit transaction;
A modification determination step of comparing the hash value of the image data to be verified with the hash value included in the approval data obtained from the second transaction on the blockchain to determine whether or not the image data to be verified has been modified. and,
An information processing program that executes. The computer that requests image data approval from the approval device.
an approval application information registration step of transmitting a first transaction in which approval application information and approval agency information are stored to a blockchain network;
a first specific information storage step of embedding and storing a two-dimensional code encoded with first specific information for specifying the first transaction registered in the blockchain in image data;
an image data registration step of transmitting a third transaction in which image data in which the two-dimensional code is embedded is stored to a blockchain network;
an image data transmitting step of transmitting image data in which the two-dimensional code is embedded and third specifying information for specifying the third transaction registered in the blockchain to an approval device;
An information processing program that executes. The computer that approves the image data
an image data receiving step of receiving image data embedded with a two-dimensional code and third specific information from the application device;
The first transaction on the blockchain is identified based on the first specific information extracted by decoding the two-dimensional code embedded in the image data received from the application device, and approval application information is obtained from the identified first transaction. an approval application information acquisition step for acquiring the
an image data acquisition step of identifying a third transaction on the blockchain based on third identification information received from the application device and acquiring image data from the identified third transaction;
an image data approval step of approving the image data by referring to the approval application information obtained from the first transaction and the image data obtained from the third transaction;
an approval data registration step of transmitting a second transaction in which approval data including a hash value of the approved image data, the first specific information, and the third specific information and approval agency information are stored to a blockchain network; ,
An information processing program that executes. A computer that verifies whether the image data has been altered,
The first transaction on the blockchain is identified based on the first specific information extracted by decoding the two-dimensional code embedded in the image data to be verified, and approval application information and approval are obtained from the identified first transaction. an approval application information output step of acquiring institutional information and outputting the approval application information to an output unit;
A second transaction on the blockchain is searched using the first specific information and the approval authority information as a search key, and if there is no hit, it is determined that the image data to be verified has been altered, and if a hit is found. includes an approval data acquisition step of obtaining approval data from the second hit transaction;
A modification determination step of comparing the hash value of the image data to be verified with the hash value included in the approval data obtained from the second transaction on the blockchain to determine whether or not the image data to be verified has been modified. and,
A third transaction on the blockchain is specified based on the third specific information included in the approval data obtained from the second transaction on the blockchain, and image data is obtained from the specified third transaction and sent to the output section. an image data output step;
An information processing program that executes.
The computer that requests image data approval from the approval device.
an approval application information registration step of transmitting a first transaction in which approval application information and approval agency information are stored to a blockchain network;
a first specific information storage step of embedding and storing a two-dimensional code encoded with first specific information for specifying the first transaction registered in the blockchain in image data;
an image data transmitting step of transmitting the image data in which the two-dimensional code is embedded to an approval device;
A computer-readable recording medium having recorded thereon an information processing program that causes the computer to execute the information processing program. The computer that approves the image data
an image data receiving step of receiving image data in which the two-dimensional code is embedded from the application device;
An approval application that identifies a first transaction on the blockchain based on first specific information extracted by decoding a two-dimensional code embedded in the image data, and obtains approval application information from the identified first transaction. an information acquisition step;
an image data approval unit that refers to the approval application information and approves the image data;
an approval data registration step of transmitting a second transaction in which approval data including a hash value of the approved image data and the first specific information and approval agency information are stored to a blockchain network;
A computer-readable recording medium having recorded thereon an information processing program that causes the computer to execute the information processing program. A computer that verifies whether the image data has been altered,
The first transaction on the blockchain is identified based on the first specific information extracted by decoding the two-dimensional code embedded in the image data to be verified, and approval application information and approval are obtained from the identified first transaction. an approval application information output step of acquiring institutional information and outputting the approval application information to an output unit;
A second transaction on the blockchain is searched using the first specific information and the approval authority information as a search key, and if there is no hit, it is determined that the image data to be verified has been altered, and if a hit is found. includes an approval data acquisition step of obtaining approval data from the second hit transaction;
A modification determination step of comparing the hash value of the image data to be verified with the hash value included in the approval data obtained from the second transaction on the blockchain to determine whether or not the image data to be verified has been modified. and,
A computer-readable recording medium having recorded thereon an information processing program that causes the computer to execute the information processing program. The computer that requests image data approval from the approval device.
an approval application information registration step of transmitting a first transaction in which approval application information and approval agency information are stored to a blockchain network;
a first specific information storage step of embedding and storing a two-dimensional code encoded with first specific information for specifying the first transaction registered in the blockchain in image data;
an image data registration step of transmitting a third transaction in which image data in which the two-dimensional code is embedded is stored to a blockchain network;
an image data transmitting step of transmitting image data in which the two-dimensional code is embedded and third specifying information for specifying the third transaction registered in the blockchain to an approval device;
A computer-readable recording medium having recorded thereon an information processing program that causes the computer to execute the information processing program. The computer that approves the image data
an image data receiving step of receiving image data embedded with a two-dimensional code and third specific information from the application device;
The first transaction on the blockchain is identified based on the first specific information extracted by decoding the two-dimensional code embedded in the image data received from the application device, and approval application information is obtained from the identified first transaction. an approval application information acquisition step for acquiring the
an image data acquisition step of identifying a third transaction on the blockchain based on third identification information received from the application device and acquiring image data from the identified third transaction;
an image data approval step of approving the image data by referring to the approval application information obtained from the first transaction and the image data obtained from the third transaction;
an approval data registration step of transmitting a second transaction in which approval data including a hash value of the approved image data, the first specific information, and the third specific information and approval agency information are stored to a blockchain network; ,
A computer-readable recording medium having recorded thereon an information processing program that causes the computer to execute the information processing program. A computer that verifies whether the image data has been altered,
The first transaction on the blockchain is identified based on the first specific information extracted by decoding the two-dimensional code embedded in the image data to be verified, and approval application information and approval are obtained from the identified first transaction. an approval application information output step of acquiring institutional information and outputting the approval application information to an output unit;
A second transaction on the blockchain is searched using the first specific information and the approval authority information as a search key, and if there is no hit, it is determined that the image data to be verified has been altered, and if a hit is found. includes an approval data acquisition step of obtaining approval data from the second hit transaction;
A modification determination step of comparing the hash value of the image data to be verified with the hash value included in the approval data obtained from the second transaction on the blockchain to determine whether or not the image data to be verified has been modified. and,
A third transaction on the blockchain is specified based on the third specific information included in the approval data obtained from the second transaction on the blockchain, and image data is obtained from the specified third transaction and sent to the output section. an image data output step;
A computer-readable recording medium having recorded thereon an information processing program that causes the computer to execute the information processing program.