JP7133589B2 - NFT Access Restriction System and NFT Access Restriction Program - Google Patents

Description

The present invention relates to an NFT access restriction system and an NFT access restriction program that set access restrictions on NFTs (Non-Fungible Tokens) recorded in a blockchain.

Blockchain is a technology that applies cryptographic technology to multiple computers that make up a distributed network to synchronize and record data. Data generated within a certain period of time is grouped into blocks, mutually verified between computers, and correct records are connected like a chain and stored. In such a blockchain, even if data is tampered with by some computers, the correct data is selected by majority vote between other computers, preventing data tampering and illegal transactions. can be done.

Next, NFT is an acronym for "Non-Fangible-Token", and is a token with unique value issued based on ERC721, the Ethereum (registered trademark) standard. In other words, it is a token that can hold unique data that cannot be replaced and is stored on the blockchain.

Patent Literature 1 discloses a technique for restricting access to data registered in a blockchain. In this technology, an access restriction system that restricts access to information registered in public blockchains consists of private blockchains set up for each of multiple user groups, encrypted data, and registered data in public blockchains. A registration part and a key registration part for registering a key used for encryption in a private blockchain provided for a user group permitted to browse data are provided, and access to the data registered in the blockchain is restricted. .

In addition, Patent Document 2 discloses a technique for managing documents on a blockchain basis using a UTXO (unspent transaction output)-based protocol. In this technology, by using a smart contract, the permissions required for issuing, viewing, and destroying documents are strictly controlled, and unauthorized persons can arbitrarily change the content of the documents. You will not be able to create, view, or destroy its contents.

JP 2019-174995 A Japanese Patent Publication No. 2020-517200

As described above, since NFTs are tokens that can have unique data that cannot be replaced, it may be necessary to impose access restrictions on them. However, conventionally, a specific method for adding access restrictions to NFTs has not been sufficiently discussed.

The present invention has been made in view of such circumstances, and by adding access restrictions to NFT, which is a token stored on the blockchain and issued as a unique value, secures the NFT. It is an object of the present invention to provide an NFT access restriction system and an NFT access restriction program capable of performing control.

(1) In order to achieve the above objects, the present invention takes the following means. That is, the NFT access restriction system of the present invention is an NFT access restriction system that sets access restrictions on NFT (Non-Fungible Token) recorded in the blockchain, and uses a secret key to release the access restrictions. , a data server that sets access restrictions on the data recorded in the NFT and writes the restricted NFT recorded data with the access restrictions set to the blockchain, and an application that holds a secret key for releasing the access restrictions and a server.

(2) In addition, the NFT access restriction system of the present invention is an NFT access restriction system that sets access restrictions on NFTs (Non-Fungible Tokens) recorded in a blockchain, and access restrictions are set from the blockchain. Based on a request by a client device that has acquired restricted NFT recorded data, an application server that associates a secret key for releasing access restrictions with the request, and performs authentication based on the secret key and the request, and a data server that enables the actual data of the NFT to be viewed by the client device when authentication is obtained.

(3) In addition, in the NFT access restriction system of the present invention, the data server includes a secret key generation unit that dynamically generates the secret key and a data recording unit that records actual data of the NFT, The application server is characterized by comprising a private key holding unit that holds the dynamically generated private key.

(4) In addition, the NFT access restriction program of the present invention is an NFT access restriction program that sets access restrictions on NFTs (Non-Fungible Tokens) recorded in the blockchain, and a secret key for releasing access restrictions , a process of setting access restrictions on the data recorded in the NFT, a process of writing the restricted NFT recorded data with the access restrictions set to the blockchain, and a secret key for releasing the access restrictions and a series of processing to be executed by a computer.

(5) In addition, the NFT access restriction program of the present invention is an NFT access restriction program that sets access restrictions on NFTs (Non-Fungible Tokens) recorded in a blockchain, and access restrictions are set from the blockchain. A process of acquiring a request by a client device that has acquired restricted NFT recorded data, a process of associating a secret key for releasing access restrictions with the request based on the request, and the secret key and the request A computer executes a series of processes of performing authentication based on the authentication and, if the authentication is obtained, enabling the client device to view the actual data of the NFT.

(6) In addition, the NFT access restriction program of the present invention includes a process of dynamically generating the secret key, a process of recording the actual data of the NFT, and a process of holding the dynamically generated secret key. , further comprising:

ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to perform secure control with respect to NFT.

1 is a diagram showing a schematic configuration of an NFT access restriction system according to an embodiment of the invention; FIG. It is a figure which shows a mode that a data server issues NFT. 4 is a sequence chart showing an operation of issuing an NFT by a data server; FIG. 10 is a diagram showing how client A acquires an NFT; FIG. 10 is a diagram showing how a client B acquires actual NFT data from a data server; 4 is a sequence chart showing an operation of client B acquiring actual data of NFT from a data server;

The present inventors focus on NFTs stored on the blockchain, and by encrypting the data recorded in the NFTs, such as "NFT JSON", restrict access to all or part of the NFTs. It was found that it can be added, leading to the present invention.

That is, the NFT access restriction system of the present invention is an NFT access restriction system that sets access restrictions on NFT (Non-Fungible Token) recorded in the blockchain, and uses a secret key to release the access restrictions. , a data server that sets access restrictions on the data recorded in the NFT and writes the restricted NFT recorded data with the access restrictions set to the blockchain, and an application that holds a secret key for releasing the access restrictions and a server. Also, an application server that associates a secret key for releasing access restrictions with the request based on a request by a client device that has acquired restricted NFT recorded data with access restrictions set from the blockchain, and the secret key and a data server that executes authentication based on the request, and enables the client device to view the actual data of the NFT when the authentication is obtained.

This made it possible for the inventors to securely control the NFT. Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.

FIG. 1 is a diagram showing a schematic configuration of an NFT access restriction system according to an embodiment of the invention. Blockchain 100 is composed of a plurality of computers that form a distributed network, applies encryption technology, and records data in synchronization. NFT102 is a “Non-Fangible-Token” and is a token with unique value issued based on ERC721, which is the standard of Ethereum (registered trademark). As shown in FIG. 1, the NFT 102 is stored on the blockchain.

An application server 202 and a data server 206 are connected to the Internet 200 . The application server 202 includes a secret key holding unit 204 that holds a secret key for setting or canceling access restrictions on data recorded in the NFT (NFT recorded data). This private key is open source. It takes the form of an "application" that has the function of decrypting, and the actual data of NFT can be viewed only on client devices (electronic devices with communication functions such as PCs, smartphones, tablets, etc.) that possess this "application". can do. In addition, the application server 202 has an access right and sends an application that is a tool for acquiring the actual data of the NFT from the data server 206 to the client device that can acquire the private key. you can provide. Note that "actual data" is, for example, information such as a specific person's image, video, or document protected by copyright.

In addition, it is possible to take the form of "login information" and make it possible to view the actual data of the NFT only by a client device that has accessed based on this "login information". Furthermore, in the form of "time setting", only the client device that accessed at a specific time or time period can view the actual NFT data, and in the "account format of other applications", only the client device that accessed It is possible to make it possible to view the actual data of the NFT.

The data server 206 includes a data recording unit 208 that records actual NFT data and a secret key generation unit 210 that dynamically generates a secret key. When the data server 206 receives a request to register the NFT data from the client device, the data server 206 records the actual data of the NFT in the data recording unit 208 and dynamically generates a secret key. The method of dynamically generating a secret key is not particularly limited in the present invention. Other encryption schemes can be used. Then, using the generated private key, access restrictions are applied to all or part of the NFT recorded data, and the data is written to the block chain 100 .

In the above description, the application server 202 and the data server 206 are separated for convenience, but the present invention is not limited to this, and the application server 202 and the data server 206 are integrated. can be Therefore, in the following description, simply referring to a "server" means both the application server 202 and the data server 206. FIG. In addition, in this specification, data recorded on the NFT and access-restricted is referred to as "restricted NFT recorded data", and data recorded on the NFT and access-restricted is referred to as "unrestricted NFT recorded data. ”.

Client A can connect to the blockchain 100 via the Internet 200 and can obtain NFT recorded data. However, restricted NFT recorded data cannot be viewed. Client B, on the other hand, can connect to the blockchain 100 via the Internet 200 and obtain NFT recorded data. Then, when the restricted NFT recorded data is acquired, the access restriction of the restricted NFT recorded data is released based on the secret key of the application server 202, the unrestricted NFT recorded data is generated, and based on the unrestricted NFT recorded data Then, the actual data of the NFT can be obtained from the data server 206 and viewed.

FIG. 2A is a diagram showing how the data server issues the NFT, and FIG. 2B is a sequence chart showing the operation of the data server issuing the NFT. When the client X500 logs in to the NFT access restriction system according to the present embodiment (step S101) and provides NFT data (step S102), the data server 206 dynamically generates a secret key and uses the generated secret key Based on this, the NFT recorded data is encrypted to generate "restricted NFT recorded data 210 (for example, public URL)" (step S103). The data server 206 issues "restricted NFT recording data 210 (eg, public URL)" to the client X500 (step S104). In FIG. 2A, "NFT JSON 210" including "Name", "Description", and "URL" is illustrated as the restricted NFT recorded data 210, but this is an example and the present invention is limited to this. It is not.

The client X 500 provides the “restricted NFT recording data (for example, public URL)” obtained from the data server 206 to the blockchain 100 and makes an NFT issue request (step S105). Block chain 100 writes the requested “restricted NFT recording data” as NFT 102 and provides NFT issued information to client X 500 (step S106).

In the data encryption process in step S103, the data server 206 imposes access restrictions on all or part of the NFT recorded data. For example, the data server 206 issues a “restricted NFT JSON URL and restricted Image URL” whose access is restricted by a secret key. Then, you can write "restricted NFT JSON URL and restricted Image URL" on the blockchain.

FIG. 3 is a diagram showing how client A acquires an NFT. Client A 300 can obtain NFT recorded data from blockchain 100 via Internet 200 . If this NFT recorded data is the "restricted NFT recorded data 302", the client A300 cannot obtain the secret key and therefore cannot view all of the NFT recorded data. In FIG. 3, the NFT recorded data acquired by the client A 300 is restricted NFT recorded data 302, and although "Name" and "Description" can be viewed, access to "URL" is restricted. , even if the client A 300 tries to access the data server 206 based on the URL of the NFT recorded data, only an error message is returned and the actual data of the NFT cannot be browsed.

FIG. 4A is a diagram showing how the client B acquires the actual NFT data from the data server, and FIG. 4B is a sequence chart showing the operation of the client B acquiring the NFT actual data from the data server. When the client B400 logs into the NFT access restriction system according to the present embodiment (step S201) and makes an NFT request to the blockchain 100 (step S202), the blockchain 100 sends an NFT request to the client B400 (Restricted NFT recording data) 102 is provided (step S203). When the client B 400 issues a restriction release request to the application server 202 (step S204), the application server 202 associates the secret key for releasing the access restriction with the request based on the request, and the data server 206: Performs authentication based on private keys and requests. If authentication is obtained, data decryption is performed (step S205) to obtain "unrestricted NFT recording data".

Here, as described above, the format of the private key can be the "application" format, the "login information" format, the "time setting" format, or the "other application account format". . Alternatively, the application server 202 may provide the private key (the key data itself) to the client B400 based on the restriction release request from the client B400 in step S204, and the client B400 may decrypt using the private key. . The client B 400 encodes the restricted NFT recorded data using a secret key to obtain "unrestricted NFT recorded data 402", and based on this "unrestricted NFT recorded data", the actual NFT data is sent to the data server 206. You can request to

In FIG. 4B, when the data is decrypted (step S205), the data server 206 provides the actual NFT data to the client B400 based on the "unrestricted NFT recorded data" (step S206). As a result, the client B 400 can display or reproduce the actual data corresponding to the unrestricted NFT recording data 402 (step S207). For example, the client B 400 acquires "restricted NFT JSON and restricted Image URL", acquires a secret key from the application server 202, and releases "restricted NFT JSON and restricted Image URL". It is also possible to obtain desired data from the data server 206 based on the obtained “unrestricted NFT JSON and unrestricted Image URL”.

As described above, according to the present embodiment, it is possible to set access restrictions on all or part of NFTs, thereby enhancing security.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments. Moreover, the effects described in the above-described embodiments are merely enumerations of the most suitable effects produced by the present invention, and the effects of the present invention are not limited to those described in the embodiments. The access restriction system according to this embodiment is implemented by executing a computer program. When implemented by a computer program, this computer program is installed and executed on a computer. Also, this program may be recorded on a removable medium such as a DVD-ROM and distributed to the user, or may be distributed by being downloaded to the user's computer via a network. Furthermore, these programs may be provided to the user's computer as a web service via a network without being downloaded.

100...Block chain 102...Restricted NFT recorded data 200...Internet 202...Application server 204...Secret key holding unit 206...Data server 208...Data recording unit 210...Secret key generating unit 210...NFT JSON (restricted NFT recorded data)
300 Client A
302... Restricted NFT recording data 400... Client B
402... Unrestricted NFT recorded data 500... Client X

Claims (4)

An NFT access restriction system that sets access restrictions on NFTs (Non-Fungible Tokens) recorded in a blockchain,
A data server that sets access restrictions on the data recorded in the NFT using a private key for releasing the access restrictions, and writes the restricted NFT recorded data with the access restrictions set to the blockchain;
an application server holding a private key for releasing the access restriction ,
The application server associates a secret key for releasing access restriction with the request based on a request by a client device that has acquired restricted NFT recorded data with access restriction set from the blockchain,
The data server authenticates the client device based on the secret key and the request, and when authentication is obtained, allows the client device to view the actual data of the NFT. NFT access restriction system. The data server is
a secret key generation unit that dynamically generates the secret key;
A data recording unit that records the actual data of NFT,
The application server is
2. The NFT access restriction system according to claim 1, further comprising a private key holding unit that holds said dynamically generated private key . An NFT access restriction program that sets access restrictions on NFTs (Non-Fungible Tokens) recorded in the blockchain,
A process of setting access restrictions on data recorded in the NFT using a private key for releasing access restrictions;
A process of writing the restricted NFT recorded data with the access restriction set to the blockchain;
a process of holding a private key for releasing the access restriction;
A process of acquiring a request by a client device that has acquired restricted NFT recorded data with access restrictions set from the blockchain;
a process of associating a private key for releasing access restrictions with the request based on the request;
a process of performing authentication to the client device based on the private key and the request;
An NFT access restriction program for causing a computer to execute a series of processes of enabling the client device to view actual data of the NFT when the authentication is obtained . a process of dynamically generating the private key;
A process of recording the actual data of the NFT;
4. The NFT access restriction program according to claim 3, further comprising a process of holding said dynamically generated secret key .

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