JP2023067688A - Transaction support system, transaction support method, and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transaction support system, a transaction support method and program for managing transfer of digital assets.

SOLUTION: In a transaction support system having a management server that can access a plurality of blockchain networks, the management server includes: an NFT disposal processing unit that disables a first non-fungible token (NFT) stored in a first wallet of a first user on a first blockchain; a payment confirmation unit which confirms that the first NFT has been disabled; and an NFT issuance processing unit which issues, on condition that the disabled first NFT has been confirmed, a second NFT to a second wallet of a second user on a second blockchain.

SELECTED DRAWING: Figure 4

COPYRIGHT: (C)2023,JPO&INPIT

Description

The present invention relates to a transaction support system, transaction support method and program.

Owners are managed by non-fungible tokens.

WO2021/186814

Consistency is difficult to manage when moving tokens between different blockchains.

The present invention has been made in view of such a background, and an object of the present invention is to provide technology capable of managing the transfer of digital assets.

The main invention of the present invention for solving the above problems is a transaction support system, which disables the first NFT stored in the first wallet of the first user in the first blockchain. A second block chain on the condition that a discard processing unit, a confirmation unit for confirming that the first NFT has become unusable, and it has been confirmed that the first NFT has become unusable and an NFT issuing processing unit that issues a second NFT to a second wallet of a second user.

Other problems disclosed by the present application and solutions thereof will be clarified by the section of the embodiment of the invention and the drawings.

According to the present invention, transfers of digital assets can be managed.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the whole structural example of the transaction support system which concerns on one Embodiment of this invention. FIG. 2 is a diagram explaining a wallet of each block chain; FIG. 3 is a diagram showing a hardware configuration example of a management server 3; FIG. 3 is a diagram showing a software configuration example of a management server 3; FIG. It is a figure explaining operation|movement of the transaction support system of this embodiment. It is a figure which shows the whole structural example of the transaction support system which concerns on 2nd Embodiment. It is a figure which shows the software structural example of the management server 3 which concerns on 2nd Embodiment.

<Overview of the invention>
The contents of the embodiments of the present invention are listed and explained. The present invention has, for example, the following configurations.
[Item 1]
an NFT destruction processing unit that disables the first NFT stored in the first wallet of the first user in the first blockchain;
a confirmation unit that confirms that the first NFT has become unusable;
An NFT issuing processing unit that issues a second NFT to a second wallet of a second user in a second blockchain on the condition that it is confirmed that the first NFT has become unusable;
A transaction support system comprising:
[Item 2]
The transaction support system according to item 1,
further comprising a first transfer processing unit that transfers the first NFT from the first wallet to the administrator's third wallet in the first blockchain,
The confirmation unit confirms that the first NFT stored in the third wallet has become unusable,
The NFT issuance processing unit stores the issued second NFT in the fourth wallet of the administrator in the second blockchain,
The transaction support system transfers the second NFT from the fourth wallet to the second wallet on condition that it is confirmed that the first NFT has become unusable. further comprising a processing unit;
A transaction support system characterized by:
[Item 3]
The transaction support system according to item 1,
further comprising an issue number storage unit that manages the number of the first NFTs that have become unusable and the number of the second NFTs that have been issued;
A transaction support system characterized by:
[Item 4]
The transaction support system according to any one of items 1 to 3,
that the content tied to the first NFT is the same as the content tied to the second NFT;
A transaction support system characterized by:
[Item 5]
disabling the first NFT stored in the first wallet of the first user on the first blockchain;
confirming that the first NFT has been disabled;
issuing a second NFT to a second wallet of a second user on a second blockchain, provided that the first NFT is confirmed to be disabled;
A transaction support method, characterized in that a computer executes
[Item 6]
disabling the first NFT stored in the first wallet of the first user on the first blockchain;
confirming that the first NFT has been disabled;
issuing a second NFT to a second wallet of a second user on a second blockchain, provided that the first NFT is confirmed to be disabled;
A program that causes a computer to run

<Overview of the system>
FIG. 1 is a diagram showing an example of the overall configuration of a transaction support system according to one embodiment of the present invention. The transaction support system of this embodiment includes a management server 3 . The management server 3 can access the blockchain network 1 and the blockchain network 2 . A user terminal 4 of a first user (user A) can access the blockchain network 1 , and a user terminal 5 of a second user (user B) can access the blockchain network 2 . Note that the user terminals 4 and 5 may be able to access the blockchain networks 2 and 1, respectively. Also, the user A and the user B may be the same person, and the user terminals 4 and 5 may be the same terminal.

Blockchain networks 1 and 2 are composed of a plurality of nodes (computers), and can manage ledger data in a distributed manner. Distributed ledgers are managed by a so-called blockchain mechanism that makes falsification difficult. Note that the detailed explanation of the distributed ledger management mechanism by blockchain is omitted here as it adopts a general one. Blockchain networks 1 and 2 can be constructed by, for example, Ethereum.

Tokens (Ethereum tokens) that can be issued by blockchain networks 1 and 2 such as Ethereum include fungible tokens and non-fungible tokens (Non-Fungible Tokens: NFT). NFTs are non-fungible tokens, unlike fungible tokens. NFTs can have unique values that distinguish them from other NFTs. For this reason, an NFT has a unique identifier (NFT-ID) to allow distinguishing it from other NFTs. NFT is, for example, a token issued according to the ERC (Ethereum Request for Comments) 721 standard. An NFT conforming to the ERC721 standard is also called an NFT-721 token. In this embodiment, as an example, assume that the NFT is an NFT-721 token. NFTs, like fungible tokens, can be traded on blockchain networks 1 and 2. Transaction histories of NFTs are recorded in blockchain networks 1 and 2. The distributed ledger of blockchain networks 1 and 2 also records the owner of the NFT and its ownership history.

In the transaction support system of this embodiment, when transferring the NFT stored in the wallet of user A of the blockchain network 1 to the wallet of the user B of the blockchain network 2, the transfer can be performed safely. I have to. In order to transfer NFT across blockchains, it is necessary to discard the NFT in the source blockchain and issue a new NFT in the destination blockchain. In order to ensure the atomicity of these processes, in the transaction support system of this embodiment, a third party (in this embodiment, the administrator X of the management server 3) different from the end users (users A and B) and referred to as an administrator user), it is possible to execute NFT destruction and generation as a series of processes under the management of administrator X.

FIG. 2 is a diagram explaining the wallet of each block chain. As shown in the figure, the blockchain network 1 is provided with a user A's wallet 11 and the blockchain network 2 is provided with a user B's wallet 22 . In addition, administrator X shall open wallets for all blockchain networks to be supported for transactions. In the example of FIG. , the wallet 21 of administrator X is opened.

<Management server>
The management server 3 may be a general-purpose computer such as a workstation or personal computer, or may be logically implemented by cloud computing. FIG. 3 is a diagram showing a hardware configuration example of the management server 3. As shown in FIG. Note that the illustrated configuration is an example, and other configurations may be employed. The management server 3 includes a CPU 301 , a memory 302 , a storage device 303 , a communication interface 304 , an input device 305 and an output device 306 . A storage device 303 is, for example, a hard disk drive, a solid state drive, a flash memory, or the like, which stores various data and programs. The communication interface 304 is an interface for connecting to a communication network. Examples include a USB (Universal Serial Bus) connector and an RS232C connector for serial communication. The input device 305 is, for example, a keyboard, mouse, touch panel, button, microphone, etc. for inputting data. The output device 306 is, for example, a display, printer, speaker, or the like that outputs data. Each functional unit of the management server device 3, which will be described later, is implemented by the CPU 301 reading a program stored in the storage device 303 into the memory 302 and executing it. It is implemented as part of the storage area provided by 303 .

FIG. 4 is a diagram showing a software configuration example of the management server 3. As shown in FIG. The management server 3 includes a transfer instruction receiving unit 311 , a first transfer processing unit 312 , a payment confirmation unit 313 , an NFT issuing processing unit 314 , an NFT discarding processing unit 315 and a second transfer processing unit 316 .

The transfer instruction receiving unit 311 receives an NFT transfer instruction (hereinafter referred to as a transfer instruction). In this embodiment, the transfer instruction receiving unit 311 can receive transfer instructions from the user terminal 4 . Also, the transfer instruction receiving unit 311 may receive the transfer instruction from a communication device different from the user terminal 4 . In the transfer instruction, the user of the current owner of the NFT of the transfer source (ie, user A) and the user of the transfer destination of the NFT (ie, user B) can be specified.

The first transfer processing unit 312 transfers the NFT from the transfer source (user A) wallet 11 to administrator X's wallet 12 . In this embodiment, the prescribed third party is assumed to be the administrator of the management server 3, and the user of the prescribed third party is referred to as the administrator user. , a third party trusted by the user. The first transfer processing unit 312 can issue to the blockchain network 1 a transaction to transfer the NFT from the transfer source user A to the administrator X.

The payment confirmation unit 313 confirms that the payment has been completed when the transfer of the NFT requires payment of monetary consideration in legal currency. The payment confirmation unit 313 may, for example, confirm the completion of payment by receiving a notification of completion of payment from the settlement system (not shown) of the settlement company. Also, the payment confirmation unit 313 may access the settlement system (not shown) of the settlement company and confirm whether or not the settlement related to the payment from the transferee user B to the transferor user A was successful. .

The NFT issuing processing unit 314 can issue an NFT corresponding to the NFT managed by the blockchain network 1 in the destination blockchain network 2 . For example, the NFT issuing processing unit 314 can take over and set the content ID indicating the content linked to the NFT to the NFT issued in the blockchain network 2 as well. The NFT issuance processing unit 314 can store the newly issued NFT in the wallet 21 in the administrator X's blockchain network 2 .

The NFT discard processing unit 315 discards the NFT to be transferred. The NFT discard processing unit 315 can issue a transaction to discard the NFT, for example. The NFT destruction processing unit 315 transfers the NFT to be transferred to the administrator X's wallet 12 in the blockchain network 1, and the NFT corresponding to the NFT is issued in the blockchain network 2 and stored in the administrator X's wallet 21. After that, the NFT can be discarded in the blockchain network 1.

The second transfer processing unit 316 transfers the NFT from the administrator X's wallet 21 to the destination user B's wallet 22 in the blockchain network 2 . The second transfer processing unit 316 can issue a transaction and perform the transfer processing.

<Action>
FIG. 5 is a diagram for explaining the operation of the transaction support system of this embodiment.

In response to the transfer instruction, the management server 3 transfers the NFT to be transferred from the wallet 11 of user A who owns the NFT to be transferred to the wallet 12 of administrator X (S401). If there is a payment for the transfer (S402: YES), the management server 3 confirms that payment in legal currency has been made from User B, who is the transfer destination, to User A (or administrator X), who is the transfer source. (S403).

The management server 3 issues a new NFT corresponding to the NFT to be transferred in the blockchain network 2 and stores it in the administrator X's wallet 21 (S404). After the NFT is newly issued in the blockchain network 2, the management server 3 discards the transaction target NFT stored in the wallet 12 of the administrator X in the blockchain network 1 (S405).

After the NFT is destroyed in the blockchain network 1, the management server 3 can transfer the NFT from the administrator X's wallet 21 to the destination user B's wallet 22 in the blockchain network 2 (S406).

As described above, in the transaction support system of the present embodiment, the atomicity of a series of processes can be ensured by transferring NFTs between blockchains via administrator X's wallet.

<Second embodiment>
A second embodiment will be described below. In the second embodiment, transfer processing via wallets 12 and 21 of administrator X is not performed, and the number of existing NFTs in each of blockchain networks 1 and 2 is managed. FIG. 6 is a diagram showing an example of the overall configuration of a transaction support system according to the second embodiment. In the second embodiment, each blockchain network 1,2 is connected to an operator device 6,7. The operator devices 6 and 7 are the operator's computers that can issue and destroy NFTs in the corresponding blockchain networks 1 and 2, respectively.

FIG. 7 is a diagram showing a software configuration example of the management server 3 according to the second embodiment. As shown in FIG. 7, in the second embodiment, the first transfer processing section 312 and the second transfer processing section 316 can be omitted. The management server 3 further includes a transaction notification receiving unit 321 , an issue number storage unit 322 , a change history storage unit 323 , and an issue number providing unit 324 .

The issued number storage unit 322 stores the number of NFTs in the blockchain networks 1 and 2. The number-of-issues storage unit 322 stores a blockchain ID that identifies a blockchain network, a type ID that indicates the type of content linked to an NFT, the number of NFTs of that type that have been issued (number of issues), and a number that has been issued once. It is possible to store the number of NFTs that have been discarded (the number of discards), etc. The number-of-issues storage unit 322 can also store the number of circulation, which is the remaining number obtained by subtracting the number of discards from the number of issues.

The fluctuation history storage unit 323 stores the history of NFT fluctuations in the blockchain networks 1 and 2 . The change history storage unit 323 can store transaction details in association with a blockchain ID that identifies a blockchain network and an NFT_ID that identifies an NFT. In addition, the fluctuation history storage unit 323 may store a type ID indicating the type of traded NFT.

The transaction notification receiving unit 321 receives notifications regarding NFT transactions (hereinafter referred to as transaction notifications) from the operator devices 6 and 7 . In this embodiment, the operator devices 6 and 7 are notified when the NFT is issued and when the NFT is discarded in the corresponding blockchain networks 1 and 2, respectively. Transaction notifications are also sent for NFT transfers. The transaction notification includes information indicating the type of content linked to the NFT (hereinafter referred to as type ID) and identification information of the NFT (hereinafter referred to as NFT_ID). In addition, information on the source and destination of the transfer can be included in the transaction notification related to the transfer.

The transaction notification receiving unit 321 can update the issued number, the discarded number, and the distributed number stored in the issued number storage unit 322 based on the transaction notification. When the transaction notification receiving unit 321 receives a transaction notification indicating that an NFT has been issued, the transaction notification receiving unit 321 issues The number and circulation number can be incremented. When the transaction notification reception unit 321 receives a transaction notification indicating that the NFT has been discarded, the transaction notification reception unit 321 discards the block chain ID indicating the blockchain network that sent the transaction notification and the type ID specified in the transaction notification. You can increment the number and decrement the circulation number. In addition, the transaction notification receiving unit 321 receives a block chain ID indicating the blockchain network of the transmission source of the transaction notification, the NFT_ID and type ID set in the transaction notification, and the contents of processing (new issue, discard, transfer, etc.) can be registered in the change history storage unit 323 . In addition, when other information such as a transfer source and a transfer destination related to the transaction is set in the transaction notification, the transaction notification reception unit 321 can additionally add the information to the processing contents.

The issue number providing unit 324 can respond with the number of NFTs in the blockchain network in response to a request (hereinafter referred to as an issue number request). The issue count request includes specification of any or all of the issue count, discard count, or circulation count, and specification of the blockchain network. The number-of-issues providing unit 324 reads at least one of the designated number of issuances, the number of discards, and the number of circulations corresponding to the blockchain network designated in the number-of-issues request from the number-of-issues storage unit 322 and responds. can be done.

In this way, by managing the number of NFTs circulating in the blockchain networks 1 and 2 by a third party different from the business operator, for example, it is possible to verify whether the number of limited sales etc. is true can be done.

Although the present embodiment has been described above, the above-described embodiment is intended to facilitate understanding of the present invention, and is not intended to limit and interpret the present invention. The present invention can be modified and improved without departing from its spirit, and the present invention also includes equivalents thereof.

For example, in the present embodiment, the consideration for NFT shall be paid in legal currency, but may be paid in virtual currency. Alternatively, payment may be made in a manner other than virtual currency.

Also, in the present embodiment, the management server 3 transfers, discards, and issues NFTs, but it is also possible to transfer, discard, and issue the NFTs in the blockchains 1 and 2 using a smart contract. In addition, all functions of the management server 3 including the payment confirmation unit 313 can be implemented by a smart contract.

Also, in the present embodiment, after the NFT is transferred to administrator X's wallet 12 in the blockchain network 1, the NFT is issued in the blockchain network 2. However, after the NFT is issued in the blockchain network 2, NFT may be transferred to administrator X's wallet 12 in the blockchain network 1 .

Also, in the present embodiment, the NFT to be transferred from the blockchain network 1 to the blockchain network 2 is discarded in the blockchain network 1, but is not limited to this, and is disabled in the blockchain network 1. Just do it. For example, it can be disabled by transferring the NFT to a predetermined burn address in the blockchain network 1. Alternatively, a flag value indicating whether or not the NFT can be used may be stored in the metadata of the NFT, and the NFT may be disabled by setting the flag value to a value (for example, false) indicating that the NFT is disabled. In addition, in the blockchain network 1, a distributed ledger that manages usable NFTs and/or unusable NFTs may be managed, and instead of discarding them, they may be managed as unusable NFTs.

1 block chain 2 block chain 3 management server 4 user terminal 5 user terminal A user B user X administrator

Claims (6)

an NFT destruction processing unit that disables the first NFT stored in the first wallet of the first user in the first blockchain;
a confirmation unit that confirms that the first NFT has become unusable;
An NFT issuing processing unit that issues a second NFT to a second wallet of a second user in a second blockchain on the condition that it is confirmed that the first NFT has become unusable;
A transaction support system comprising: The transaction support system according to claim 1,
further comprising a first transfer processing unit that transfers the first NFT from the first wallet to the administrator's third wallet in the first blockchain,
The confirmation unit confirms that the first NFT stored in the third wallet has become unusable,
The NFT issuance processing unit stores the issued second NFT in the fourth wallet of the administrator in the second blockchain,
The transaction support system transfers the second NFT from the fourth wallet to the second wallet on condition that it is confirmed that the first NFT has become unusable. further comprising a processing unit;
A transaction support system characterized by: The transaction support system according to claim 1,
further comprising an issue number storage unit that manages the number of the first NFTs that have become unusable and the number of the second NFTs that have been issued;
A transaction support system characterized by: The transaction support system according to any one of claims 1 to 3,
that the content tied to the first NFT is the same as the content tied to the second NFT;
A transaction support system characterized by: disabling the first NFT stored in the first wallet of the first user on the first blockchain;
confirming that the first NFT has been disabled;
issuing a second NFT to a second wallet of a second user on a second blockchain, provided that the first NFT is confirmed to be disabled;
A transaction support method, characterized in that a computer executes disabling the first NFT stored in the first wallet of the first user on the first blockchain;
confirming that the first NFT has been disabled;
issuing a second NFT to a second wallet of a second user on a second blockchain, provided that the first NFT is confirmed to be disabled;
A program that causes a computer to run

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