KR20240033455A - Non-fungible token transfer issuance service server that provides non-fungible token transfer issuance service between blockchains and the operating method thereof - Google Patents

Abstract

An NFT transfer service server and its operating method are disclosed. The present invention proposes an NFT transfer issuance service server that provides an NFT (Non-Fungible Token) transfer issuance service between blockchains and an operation method, thereby transferring NFTs held by users through the NFT transfer issuance service. And it can support trading previously issued NFTs with other users.

Description

NFT transfer issuance service server that provides NFT transfer issuance service between blockchains and its operation method {NON-FUNGIBLE TOKEN TRANSFER ISSUANCE SERVICE SERVER THAT PROVIDES NON-FUNGIBLE TOKEN TRANSFER ISSUANCE SERVICE BETWEEN BLOCKCHAINS AND THE OPERATING METHOD THEREOF}

The present invention relates to an NFT transfer issuance service server that provides NFT (Non-Fungible Token) transfer issuance services between blockchains and a method of operating the same.

NFT (Non-Fungible Token) refers to a 'non-fungible token' and is a virtual asset that cannot be replaced with another token because each token has a unique value.

Recently, the adoption of NFTs has been increasing in various fields such as digital artwork, online sports, and game item trading.

Because these NFTs have their own mainnet, it is difficult for the owner of a specific NFT to trade the NFT he or she owns in the NFT market of another mainnet.

Here, the mainnet refers to the network that actually launches and operates the blockchain project, and blockchain technology means that when certain data called a transaction is generated, any one node among a plurality of nodes participating in the blockchain network Create a new block containing the transaction based on the previous block included in blockchain data in which several blocks are connected in a chain, connect the block to the blockchain data in a chain, and then add the block to the blockchain. It refers to a technology that allows certain data to be distributed and stored in multiple nodes by distributing it to other nodes through a network.

In this regard, if the NFT issued on the mainnet called 'A' is transferred to the mainnet called 'B' and then this NFT can be traded, users will be able to further improve the scalability of NFT transactions. .

Therefore, research is needed on system technology that supports providing NFT transfer issuance services between blockchains.

The present invention proposes an NFT transfer issuance service server that provides an NFT (Non-Fungible Token) transfer issuance service between blockchains and an operation method, thereby transferring NFTs held by users through the NFT transfer issuance service. And we want to support trading previously issued NFTs with other users.

The NFT transfer issuance service server that provides NFT (Non-Fungible Token) transfer issuance service between blockchains according to an embodiment of the present invention is a first one of a plurality of users subscribed to the NFT transfer issuance service. From the user's first user terminal, a first NFT registered in a preset first blockchain network - the first NFT is an NFT for the first content data stored in a preset cloud server, and the first NFT includes, Information about the first storage path on the cloud server where the first content data is stored, and the first owner identification information of the first user is included as the owner information of the first NFT - first NFT identification information for When received, when a transfer issuance request command for the first NFT from the first blockchain network to a preset second blockchain network is received, based on the first NFT identification information, the first blockchain network Owner verification to verify whether the owner of the first NFT is the first user by checking the owner information of the first NFT included in the first NFT by checking the first NFT registered in Part, when verification is completed that the owner of the first NFT is the first user, an information extraction unit for extracting information about the first storage path and the first owner identification information included in the first NFT, When the information about the first storage path and the first owner identification information are extracted, a first transaction containing destruction information indicating that the first NFT has been destroyed is created, and then the first transaction is sent to the first block An NFT deactivation processing unit that deactivates the first NFT by registering it in the chain network, and when the first NFT is deactivated, a first replacement NFT containing information about the first storage path and the first owner identification information When the replacement NFT generator and the first replacement NFT are created, the first replacement NFT is registered in the second blockchain network, thereby completing the issuance of the first replacement NFT, and then the first replacement NFT is generated. The NFT includes a transfer completion message transmission unit that generates a transfer completion message indicating that the transfer from the first blockchain network to the second blockchain network has been completed and transmits it to the first user terminal.

In addition, the method of operating an NFT transfer issuance service server that provides an NFT transfer issuance service between blockchains according to an embodiment of the present invention involves a first user who is one of a plurality of users subscribed to the NFT transfer issuance service. From the first user terminal, a first NFT registered in a preset first blockchain network - the first NFT is an NFT for the first content data stored in a preset cloud server, and the first NFT includes the Information about the first storage path on the cloud server where the first content data is stored, and the first owner identification information of the first user is included as the owner information of the first NFT - the first NFT identification information for When received, a transfer issuance request command for the first NFT from the first blockchain network to a preset second blockchain network is received, based on the first NFT identification information, to the first blockchain network. Verifying whether the owner of the first NFT is the first user by checking the registered first NFT and checking the owner information of the first NFT included in the first NFT, the step of verifying whether the owner of the first NFT is the first user, When verification is completed that the owner of the first NFT is the first user, extracting information about the first storage path and the first owner identification information included in the first NFT, the first storage path When the information and the first owner identification information are extracted, a first transaction containing destruction information indicating that the first NFT has been destroyed is created, and then the first transaction is registered in the first blockchain network. By doing so, deactivating the first NFT, if the first NFT is deactivated, generating a first replacement NFT containing information about the first storage path and the first owner identification information, and the first 1 When a replacement NFT is created, by registering the first replacement NFT in the second blockchain network, after completing the issuance of the first replacement NFT, the first NFT is issued in the first blockchain network. It includes generating a transfer issuance completion message indicating completion of transfer to the second blockchain network and transmitting it to the first user terminal.

The present invention proposes an NFT transfer issuance service server that provides an NFT (Non-Fungible Token) transfer issuance service between blockchains and an operation method, thereby transferring NFTs held by users through the NFT transfer issuance service. And it can support trading previously issued NFTs with other users.

Figure 1 is a diagram showing the structure of an NFT transfer issuance service server that provides NFT (Non-Fungible Token) transfer issuance services between blockchains according to an embodiment of the present invention.
Figure 2 is a flowchart showing the operation method of the NFT transfer service server that provides NFT transfer issuance services between blockchains according to an embodiment of the present invention.

Hereinafter, embodiments according to the present invention will be described in detail with reference to the attached drawings. This description is not intended to limit the present invention to specific embodiments, but should be understood to include all changes, equivalents, and substitutes included in the spirit and technical scope of the present invention. In describing each drawing, similar reference numerals are used for similar components, and unless otherwise defined, all terms used in this specification, including technical or scientific terms, are within the scope of common knowledge in the technical field to which the present invention pertains. It has the same meaning as generally understood by those who have it.

In this document, when a part "includes" a certain component, this means that it may further include other components rather than excluding other components, unless specifically stated to the contrary. Additionally, in various embodiments of the present invention, each component, functional block, or means may be composed of one or more subcomponents, and the electrical, electronic, and mechanical functions performed by each component may be electronic. It may be implemented with various known elements or mechanical elements such as circuits, integrated circuits, and ASICs (Application Specific Integrated Circuits), and may be implemented separately or by integrating two or more into one.

Meanwhile, the blocks in the attached block diagram or the steps in the flow chart are computer program instructions that are mounted on the processor or memory of equipment capable of data processing, such as general-purpose computers, special-purpose computers, portable laptop computers, and network computers, and perform designated functions. It can be interpreted to mean. Because these computer program instructions can be stored in a memory provided in a computer device or in a computer-readable memory, the functions described in the blocks of a block diagram or the steps of a flow diagram can be produced as a manufactured product containing instruction means to perform them. It could be. In addition, each block or each step may represent a module, segment, or portion of code that includes one or more executable instructions for executing specified logical function(s). Additionally, it should be noted that in some alternative embodiments, it is possible for functions mentioned in blocks or steps to be executed in a different order. For example, two blocks or steps shown in succession may be performed substantially simultaneously or in reverse order, and in some cases, some blocks or steps may be omitted.

Figure 1 is a diagram showing the structure of an NFT transfer issuance service server that provides NFT (Non-Fungible Token) transfer issuance services between blockchains according to an embodiment of the present invention.

Referring to Figure 1, the NFT previous issuance service server 110 according to the present invention includes an owner verification unit 111, an information extraction unit 112, an NFT deactivation processing unit 113, a replacement NFT generation unit 114, and a previous issuance unit. Includes a completion message transmission unit 115.

The owner verification unit 111 receives the preset first blockchain network 10 from the first user terminal 155 of the first user 150, which is one of the plurality of users subscribed to the NFT transfer issuance service. When the first NFT identification information for the first NFT registered in is received, a transfer issuance request command for the first NFT from the first blockchain network 10 to the preset second blockchain network 20 is received. , Based on the first NFT identification information, by querying the first NFT registered in the first blockchain network 10 and confirming the owner information of the first NFT included in the first NFT, It is verified whether the owner of the first NFT is the first user 150.

Here, the first NFT is an NFT for first content data stored in a preset cloud server 140, and the first NFT includes a first storage path on the cloud server 140 where the first content data is stored. Information on and the first owner identification information of the first user 150 are included as the owner information of the first NFT. Here, content data refers to data about content such as images, music, videos, and documents, storage path refers to a URI (Uniform Resource Identifier) on the cloud server 140 where the data is stored, and owner identification information refers to , refers to unique information to identify each owner, such as pre-issued ID, resident registration number, etc.

At this time, according to an embodiment of the present invention, the owner verification unit 111 is a specific configuration for verifying whether the owner of the first NFT is the first user 150, and includes a public key storage unit 116, It may include an electronic signature request unit 117, a data extraction unit 118, and a verification processing unit 119.

The public key storage unit 116 stores a public key corresponding to a private key pre-issued for each of the plurality of users (the private key is pre-stored in the user terminal of each of the plurality of users). there is.

For example, the public key storage unit 116 may store a public key corresponding to a private key pre-issued for each of the plurality of users, as shown in Table 1 below.

For each of multiple users
Pre-issued private key public key user 1 private key 1 public key 1 user 2 private key 2 public key 2 user 3 private key 3 public key 3 ... ... ...

When the first NFT identification information is received from the first user terminal 155 and the previous issuance request command is received, the electronic signature request unit 117 stores data for the first NFT identification information and a public key. After generating the first encrypted data by encrypting it with the first public key corresponding to the first private key previously issued to the first user 150 stored in the unit 116, it is sent to the first user terminal 155. , While transmitting the first encrypted data, a request is made to generate and transmit an electronic signature value based on the first encrypted data.

In response to a request to transmit the electronic signature value, the data extraction unit 118 receives a first electronic signature value from the first user terminal 155 (the first electronic signature value is the first user terminal 155). The first encryption data is decrypted with the first private key stored in the first user terminal 155 to restore the data for the first NFT identification information, and the data for the restored first NFT identification information and the When concatenated data is generated by concatenating data on the first owner identification information and then encrypted with the first private key to generate concatenated data, the first electronic signature value is received. By decrypting with the first public key, the concatenated data is restored, and then data about the first NFT identification information is removed from the restored concatenated data, thereby extracting data about the first owner identification information.

When data on the first owner identification information is extracted, the verification processing unit 119 searches the first NFT registered in the first blockchain network 10 based on the first NFT identification information, and By checking whether the owner information of the first NFT included in the first NFT matches the first owner identification information, it is verified whether the owner of the first NFT is the first user 150.

Hereinafter, the operations of the electronic signature request unit 117, data extraction unit 118, and verification processing unit 119 will be described in detail using examples.

First, a preset first block is sent from the first user terminal 155 of 'User 1 (150)', one of the plurality of users subscribed to the NFT transfer issuance service, to the NFT transfer issuance service server 110. As the first NFT identification information for the first NFT registered in the chain network 10 is received, the transfer issuance of the first NFT from the first blockchain network 10 to the preset second blockchain network 20 Assume that a request command has been received.

Then, the electronic signature request unit 117 converts the data about the first NFT identification information into the pre-issued 'User 1 (150)' stored in the public key storage unit 116 as shown in Table 1 above. First encrypted data can be created by encrypting with 'public key 1' corresponding to 'private key 1'.

Then, the electronic signature request unit 117 may request the first user terminal 155 to generate and transmit an electronic signature value based on the first encrypted data while transmitting the first encrypted data.

At this time, the first user terminal 155 may store a pre-issued 'private key 1' for 'User 1 (150)', and the first user terminal 155 may be received from the NFT previous issuance service server 110. When a request for transmission of the first encryption data and the electronic signature value is received, the first user terminal 155 decrypts the first encryption data with 'private key 1' and provides information on the first NFT identification information. Data can be restored. Then, the first user terminal 155 generates concatenated data by concatenating data about the restored first NFT identification information and data about the first owner identification information, and then converts the concatenated data into 'private key 1'. By encrypting ', a first electronic signature value can be generated and the first electronic signature value can be transmitted to the NFT transfer service server 110.

For this reason, when it is said that the first electronic signature value has been received from the first user terminal 155 to the NFT transfer service server 110, the first electronic signature value is the concatenated data as 'private key 1'. Since it is an electronic signature value generated by encryption, and the public key corresponding to 'private key 1' is 'public key 1', the data extraction unit 118 decrypts the first electronic signature value with 'public key 1', The concatenated data can be restored.

Then, the data extraction unit 118 can extract data about the first owner identification information by removing data about the first NFT identification information from the restored concatenated data.

In this way, when the data for the first owner identification information is extracted by the data extraction unit 118, the verification processing unit 119 is registered in the first blockchain network 10 based on the first NFT identification information. By querying the first NFT, it is possible to check whether the owner information of the first NFT included in the first NFT matches the first owner identification information.

At this time, since the first NFT includes the first owner identification information as the owner information of the first NFT, the verification processing unit 119 determines that the owner information of the first NFT included in the first NFT is, By confirming that it matches the first owner identification information, it can be verified that the owner of the first NFT is 'User 1 (150)'.

In this way, when verification is completed by the owner verification unit 111 that the owner of the first NFT is the first user 150, the information extraction unit 112 determines the first storage path included in the first NFT. Extract information about and the first owner identification information.

In this way, when the information about the first storage path and the first owner identification information are extracted by the information extraction unit 112, the NFT deactivation processing unit 113 includes extinction information indicating that the first NFT has been destroyed. After creating the first transaction, the first NFT is deactivated by registering the first transaction in the first blockchain network 10.

In this regard, according to one embodiment of the present invention, the NFT deactivation processing unit 113 generates a first transaction including the extinction information in order to register the first transaction in the first blockchain network 10. After that, the first transaction can be propagated to the first blockchain network 10. Then, one of the plurality of first nodes 11, 12, 13, 14, 15, and 16 constituting the first blockchain network 10 creates a block containing the first transaction and , can be propagated to a plurality of first nodes (11, 12, 13, 14, 15, 16). Accordingly, when the block is received by the plurality of first nodes (11, 12, 13, 14, 15, and 16), the plurality of first nodes (11, 12, 13, 14, 15, and 16) receive the block. Based on the first transaction on the block, by deactivating the first NFT included in the blockchain data stored in each node, the first NFT is no longer displayed on the first blockchain network 10. It can be incinerated so that it does not exist.

In this way, when the first NFT is deactivated by the NFT deactivation processing unit 113, the replacement NFT generation unit 114 creates a first replacement NFT containing information about the first storage path and the first owner identification information. Create.

In this way, when the first replacement NFT is generated by the replacement NFT generation unit 114, the previously issued message transmission unit 115 registers the first replacement NFT in the second blockchain network 20, Complete the issuance of the first alternative NFT.

At this time, according to one embodiment of the present invention, the previous issuance completion message transmission unit 115 registers the first replacement NFT in the second blockchain network 20, and processes the transaction containing the first replacement NFT. After creating, the transaction can be propagated to the second blockchain network 20. Then, one of the plurality of second nodes 21, 22, 23, 24, 25, and 26 constituting the second blockchain network 20 generates a block containing the transaction, It can be propagated to the second nodes (21, 22, 23, 24, 25, 26). Accordingly, when the block is received by a plurality of second nodes (21, 22, 23, 24, 25, 26), each of the plurality of second nodes (21, 22, 23, 24, 25, 26) Based on the previous block linked by chain to the blockchain data stored in the node, the first alternative NFT can be shared with each other by linking the block to the blockchain data by chain.

In this way, when the issuance of the first alternative NFT is completed, the previous issuance completion message transmission unit 115 transfers the first NFT from the first blockchain network 10 to the second blockchain network 20. A previous publication completion message indicating completion is generated and transmitted to the first user terminal 155.

According to one embodiment of the present invention, the NFT deactivation processing unit 113 stores the original content for the first NFT on the cloud server 140 before deactivating the first NFT for replacement issuance of the first NFT. It may further include a configuration for checking whether the first content data, which is data, exists normally. In this regard, the NFT deactivation processing unit 113 may include a content data receiving unit 120, a confirmation request unit 121, and a deactivation processing unit 122.

When the information about the first storage path and the first owner identification information are extracted from the first NFT through the information extraction unit 112, the content data receiving unit 120 connects to the cloud server 140, Based on information about the first storage path, the first content data stored on the first storage path is received from the cloud server 140.

When the first content data is received, the confirmation request unit 121 transmits the first content data to the first user terminal 155 and determines whether the first content data is content data for the first NFT. A confirmation request message is sent indicating whether to confirm.

At this time, according to one embodiment of the present invention, when transmitting the first content data to the first user terminal 155, the confirmation request unit 121 is used to prevent the first content data from being exposed to other users. , the first content data can be encrypted and transmitted to the first user terminal 155.

In this regard, according to one embodiment of the present invention, the confirmation request unit 121 is a specific configuration for encrypting the first content data and transmitting it to the first user terminal 155, and the serial number table maintenance unit 123 ), an encryption event generating unit 124, a serial number extracting unit 125, a serial number dividing unit 126, an operation code generating unit 127, a hash value generating unit 128, and a transmitting unit 129. You can.

The serial number table maintenance unit 123 has 2n (n is a natural number of 2 or more) digits corresponding to each of the plurality of preset types of content data that are pre-shared with the user terminals of each of the plurality of users. A serial number table containing serial numbers is stored and maintained.

For example, when n is '4', the serial number table maintenance unit 123 may store and maintain a serial number table as shown in Table 2 below.

Multiple types of content data 8-digit serial number image 12305429 music 32866401 video 17522022 document 82762175 ... ...

When the first content data is received from the cloud server 140, the encryption event generator 124 generates an encryption event to encrypt the first content data.

When the encryption event occurs, the serial number extractor 125 checks the type of the first content data, and when the type of the first content data is confirmed to be the first type, from the serial number table, the first Extract the first serial number corresponding to the type.

When the first serial number is extracted, the serial number dividing unit 126 divides the first serial number into an n-digit first partial serial number on the left and an n-digit first partial serial number on the right, based on the central axis of the first serial number. The second part of is divided by serial number.

When the first serial number is divided into the first partial serial number and the second partial serial number based on the central axis, the operation code generator 127 generates each of the n numbers constituting the first partial serial number. An n-bit first operation code is generated by configuring the result value of performing the Modulo-2 operation on a bit string, and each of the n numbers constituting the second partial serial number An n-bit second operation code is generated by configuring the result value of performing the modulo-2 operation on into a bit string.

Here, the modulo-2 operation refers to an operation that performs division by dividing the dividend by 2 and calculates the remainder.

The hash value generator 128 generates an n-bit seed code by performing an exclusive OR (XOR) operation between the first operation code and the second operation code, and then converts the seed code to a preset hash. It is applied as input to the function to generate the first hash value.

When the first hash value is generated, the transmission unit 129 generates second encrypted data by encrypting the first content data with the first hash value, and then sends the second encrypted data to the first user terminal 155. The second encrypted data, information on the first type, and the hash function are transmitted.

Hereinafter, the operations of the encryption event generating unit 124, serial number extracting unit 125, serial number dividing unit 126, operation code generating unit 127, hash value generating unit 128, and transmitting unit 129. This will be explained in detail using an example.

First, when the first content data is received from the cloud server 140 to the NFT transfer service server 110, the encryption event generator 124 generates an encryption event to encrypt the first content data. You can do it.

In this way, when the encryption event is generated by the encryption event generator 124, the serial number extractor 125 can confirm the type of the first content data.

At this time, if the type of the first content data is confirmed to be a first type such as 'image' by the serial number extractor 125, the serial number extractor 125 extracts the data from the serial number table as shown in Table 2 above. , '12305429', the serial number corresponding to the first type of 'image', can be extracted as the first serial number.

In this way, when the first serial number is extracted by the serial number extraction unit 125, the serial number dividing unit 126 uses '12305429', the first serial number, based on the central axis of the first serial number, It can be divided into '1230', which is the 4-digit first partial serial number on the left, and '5429', which is the 4-digit second partial serial number on the right.

In this way, when the first serial number is divided into the first partial serial number and the second partial serial number based on the central axis by the serial number dividing unit 126, the operation code generating unit 127 generates the first partial serial number. A 4-bit first operation code, such as '1010', can be generated by configuring the result value of performing the modulo-2 operation on each of the four numbers that make up the partial serial number '1230' as a bit string. The result of performing modulo-2 operation on each of the four numbers constituting the second partial serial number '5429' is configured as a bit string to form a 4-bit second operation code as '5429'. It can be created like '1001'.

Then, the hash value generator 128 generates a 4-bit seed code such as '0011' by performing an exclusive OR operation between the first operation code '1010' and the second operation code '1001'. can do.

Afterwards, the hash value generator 128 may apply the seed code '0011' as an input to a preset hash function to generate a first hash value such as '26d103c620a31345ag57qat327891703'.

In this way, when the first hash value is generated by the hash value generator 128, the transmission unit 129 encrypts the first content data with the first hash value '26d103c620a31345ag57qat327891703', thereby creating the second encrypted data. can be created.

Then, the transmission unit 129 may transmit the second encrypted data, information about the first type of 'image', and the hash function to the first user terminal 155.

At this time, according to an embodiment of the present invention, the first user terminal 155 stores the serial number table in memory, and from the NFT transfer service server 110, the second encryption data and the first When the information about the type and the hash function are received, the first serial number corresponding to the first type is extracted from the serial number table, and then, based on the central axis, the first serial number is n on the left. When dividing the first partial serial number of digits and the second partial serial number of n digits on the right, and performing modulo-2 operation on each of the n numbers constituting the first partial serial number, The n-bit first operation code is generated by configuring the result value as a bit string, and the result value when modulo-2 operation is performed on each of the n numbers constituting the second partial serial number is bit string. After generating the n-bit second operation code by configuring it as a column, generating the seed code by performing an exclusive OR operation between the first operation code and the second operation code, and applying the seed code to the hash function After generating the first hash value by applying it as an input, the first content data can be restored by decrypting the second encrypted data with the first hash value.

Hereinafter, the operation of the first user terminal 155 will be described in detail using an example.

First, as in the above-described example, n is set to '4', and on the memory of the first user terminal 155, the serial number table as shown in Table 2, which is pre-shared with the NFT transfer service server 110, is pre-existing. Assume it is saved. In addition, as in the above-mentioned example, as the transmission unit 129 transmits the second encrypted data, information about the first type of 'image', and the hash function to the first user terminal 155, NFT Assume that the second encrypted data, information on the first type of 'image', and the hash function are received from the previous publication service server 110 to the first user terminal 155.

Then, the first user terminal 155 can extract '12305429', the serial number corresponding to the first type of 'image', as the first serial number from the serial number table shown in Table 2 above.

In this way, when the first serial number is extracted by the first user terminal 155, the first user terminal 155 enters '12305429', the first serial number, as the 4-digit number on the left with respect to the central axis. It can be divided into '1230', which is the first partial serial number, and '5429', which is the 4-digit second partial serial number on the right.

In this way, when the first serial number is divided by the first user terminal 155 into the first partial serial number and the second partial serial number based on the central axis, the first user terminal 155 The 4-bit first operation code is generated as '1010' by configuring the result of performing modulo-2 operation on each of the four numbers constituting the partial serial number '1230' as a bit string. The result of performing modulo-2 operation on each of the four numbers constituting the second partial serial number '5429' is configured as a bit string to obtain the second operation code of 4 bits. can be created as '1001'.

Then, the first user terminal 155 can generate the seed code as '0011' by performing an exclusive OR operation between the first operation code '1010' and the second operation code '1001'. there is.

Afterwards, the first user terminal 155 may apply the seed code '0011' as an input to the hash function to generate the first hash value such as '26d103c620a31345ag57qat327891703'.

In this way, when the first hash value is generated by the first user terminal 155, the first user terminal 155 decrypts the second encrypted data with the first hash value '26d103c620a31345ag57qat327891703', thereby Content data can be restored.

In this way, when the first content data is restored by the first user terminal 155, the first user 150 confirms the first content data through the first user terminal 155, thereby You can check whether the content data for the first NFT is correct.

If the first content data is confirmed by the first user 150 to be content data for the first NFT, the first user 150 determines that the first content data is for the first NFT. A command requesting to generate a feedback message indicating that the content data has been confirmed to be correct and transmit it to the NFT transfer service server 110 may be applied to the first user terminal 155.

At this time, when a command requesting to generate the feedback message and transmit it to the NFT transfer service server 110 is applied by the first user 150, the first user terminal 155 generates the feedback message and creates an NFT It can be transmitted to the previous publication service server 110.

In this way, when the feedback message is received from the first user terminal 155 to the NFT transfer service server 110, the deactivation processing unit 122 generates the first transaction including the extinction information, and then By registering 1 transaction in the first blockchain network 10, the first NFT can be deactivated.

According to one embodiment of the present invention, the NFT transfer service server 110 includes a sales amount request unit 130, a sales registration processing unit 131, a payment method request unit 133, a payment processing unit 134, and a transaction registration processing unit. (135) may be further included.

After the previous issuance completion message is generated and transmitted to the first user terminal 155, the sales amount request unit 130 stores sales information about the first alternative NFT from the first user terminal 155 into a sales information database. When a sales registration request command requesting registration at 132 is received, a request is made to transmit sales amount information for sale of the first alternative NFT to the first user terminal 155.

The sales registration processing unit 131 is the sales price information of the first replacement NFT from the first user terminal 155. When the first sale price information is received, the sales information database 132 stores information about the first replacement NFT. By storing the first sale amount information, sale registration for the first alternative NFT is processed.

After the sales registration for the first alternative NFT is processed, the payment method request unit 133 receives the first When a purchase request command for an alternative NFT is received, a request is made to transmit payment method information for payment to the second user terminal 165.

When first payment method information is received from the second user terminal 165, the payment processing unit 134 processes payment for the amount according to the first sales amount information based on the first payment method information. do.

Hereinafter, the operations of the sales amount request unit 130, the sales registration processing unit 131, the payment method request unit 133, and the payment processing unit 134 will be described in detail using examples.

First, as in the above-described example, the first NFT indicates that the transfer has been completed from the first blockchain network 10 to the second blockchain network 20 by the previous issuance completion message transmission unit 115. It is said that a transfer issuance completion message is generated and transmitted to the first user terminal 155, and thereafter, sales information for the first alternative NFT is sent from the first user terminal 155 to the NFT transfer issuance service server 110. Assume that a sales registration request command requesting registration in the sales information database 132 is received.

Then, the sales amount request unit 130 may request to transmit sales amount information for selling the first alternative NFT to the first user terminal 155.

In response to this, when it is said that '100,000 won', which is the first sales amount information, is received from the first user terminal 155 to the NFT transfer issuance service server 110 as the sales amount information of the first replacement NFT, the sale The registration processing unit 131 may process sales registration for the first NFT by storing '100,000 won', which is the first sales amount information for the first NFT, in the sales information database 132.

In this way, after the sales registration for the first alternative NFT is processed by the sales registration processing unit 131, from the second user terminal 165 of 'User 2 160', which is one of the plurality of users, Assume that a purchase request command for the first alternative NFT is received.

Then, the payment method request unit 133 may request the second user terminal 165 to transmit payment method information for payment.

In response to this, when it is said that 'credit card information' is received from the second user terminal 165 to the NFT transfer service server 110, the payment processing unit 134 is based on the 'credit card information', 1 Payment can be processed for ‘100,000 won’, which is the amount according to the sales amount information.

In this way, when payment processing for the amount according to the first sales price information is completed by the payment processing unit 134, the transaction registration processing unit 135 receives the information from the second user terminal 165 to the second user 160. After receiving the second owner identification information, which is the owner identification information, a second transaction containing ownership transfer information instructing to change the first owner identification information included in the first replacement NFT to the second owner identification information. creates .

Then, the transaction registration processing unit 135 registers the second transaction in the second blockchain network 20, thereby processing the second transaction included in the first alternative NFT registered in the second blockchain network 20. The first owner identification information is processed to be changed to the second owner identification information.

At this time, according to an embodiment of the present invention, the transaction registration processing unit 135 registers the second transaction in the second blockchain network 20, and registers the second transaction in the second blockchain network 20. It can be spread to. Then, one of the plurality of second nodes 21, 22, 23, 24, 25, and 26 constituting the second blockchain network 20 creates a block containing the second transaction. , can be propagated to a plurality of second nodes (21, 22, 23, 24, 25, 26). Accordingly, when the block is received by a plurality of second nodes (21, 22, 23, 24, 25, 26), the plurality of second nodes (21, 22, 23, 24, 25, 26) receive the block. Based on the second transaction on the block, the first owner identification information included in the first replacement NFT included in the blockchain data stored in each node can be changed to the second owner identification information. there is.

Figure 2 is a flowchart showing the operation method of the NFT transfer service server that provides NFT transfer issuance services between blockchains according to an embodiment of the present invention.

In step S210, a first NFT (the first NFT) registered in a preset first blockchain network is received from the first user terminal of a first user who is one of a plurality of users subscribed to the NFT previous issuance service. is an NFT for first content data stored in a preset cloud server, and the first NFT includes information about a first storage path on the cloud server where the first content data is stored, and the owner of the first NFT As the first NFT identification information (including the first owner identification information of the first user) is received, the first NFT for the first NFT is transferred from the first blockchain network to a preset second blockchain network. When a previous issuance request command is received, based on the first NFT identification information, the first NFT registered in the first blockchain network is searched, and the owner of the first NFT included in the first NFT is identified. By checking the information, it is verified whether the owner of the first NFT is the first user.

In step S220, when verification is completed that the owner of the first NFT is the first user, information about the first storage path and the first owner identification information included in the first NFT are extracted.

In step S230, when the information about the first storage path and the first owner identification information are extracted, a first transaction containing extinction information indicating that the first NFT has been destroyed is generated, and then the first transaction By registering with the first blockchain network, the first NFT is deactivated.

In step S240, when the first NFT is deactivated, a first replacement NFT containing information about the first storage path and the first owner identification information is generated.

In step S250, when the first replacement NFT is created, after completing the issuance of the first replacement NFT by registering the first replacement NFT in the second blockchain network, the first NFT is, A transfer issuance completion message indicating that the transfer from the first blockchain network to the second blockchain network has been completed is generated and transmitted to the first user terminal.

At this time, according to one embodiment of the present invention, in step S210, a private key is pre-issued for each of the plurality of users (the private key is pre-stored in the user terminal of each of the plurality of users). Maintaining a public key storage unit in which the public key corresponding to is stored, when the first NFT identification information is received from the first user terminal and the previous issuance request command is received, the first NFT identification information After generating first encrypted data by encrypting the data with the first public key corresponding to the first private key pre-issued for the first user stored in the public key storage unit, the first user terminal While transmitting the first encrypted data, requesting to generate and transmit an electronic signature value based on the first encrypted data, in response to the request for transmission of the electronic signature value, from the first user terminal, 1 electronic signature value (the first electronic signature value is the first user terminal decrypts the first encryption data with the first private key stored in the first user terminal for the first NFT identification information) Electronics generated by restoring data, concatenating data about the restored first NFT identification information and data about the first owner identification information to generate concatenated data, and then encrypting the concatenated data with the first private key. When the signature value) is received, the first electronic signature value is decrypted with the first public key, the concatenated data is restored, and then the data for the first NFT identification information is removed from the restored concatenated data, Extracting data about the first owner identification information and when the data about the first owner identification information is extracted, based on the first NFT identification information, the first NFT registered in the first blockchain network By checking whether the owner information of the first NFT included in the first NFT matches the first owner identification information, it is confirmed whether the owner of the first NFT is the first user. It may include a verification step.

Additionally, according to one embodiment of the present invention, in step S230, when the information on the first storage path and the first owner identification information are extracted, the cloud server is accessed to provide information on the first storage path. Based on this, receiving the first content data stored on the first storage path from the cloud server, when the first content data is received, sending the first content data to the first user terminal. While transmitting, transmitting a confirmation request message indicating whether the first content data is correct content data for the first NFT, and from the first user terminal, the first content data is the first NFT When a feedback message indicating that the content data for 1 It may include the step of deactivating the NFT.

At this time, according to one embodiment of the present invention, the step of transmitting the confirmation request message includes different types of content data corresponding to each of a plurality of preset types of content data that are pre-shared with the user terminal of each of the plurality of users. Storing and maintaining a serial number table in which a serial number of 2n (n is a natural number of 2 or more) digits is recorded; when the first content data is received from the cloud server, an encryption event for encrypting the first content data generating a step, when the encryption event occurs, confirming the type of the first content data, and if the type of the first content data is confirmed as the first type, from the serial number table, corresponding to the first type Extracting the first serial number, when the first serial number is extracted, the first serial number is divided into the n-digit first partial serial number on the left and the right partial serial number based on the central axis of the first serial number. Splitting into a second partial serial number of n digits, when the first serial number is divided into the first partial serial number and the second partial serial number based on the central axis, constituting the first partial serial number An n-bit first operation code is generated by configuring the result value of performing the modulo-2 operation on each of the n numbers into a bit string, and each of the n numbers constituting the second partial serial number Generating an n-bit second operation code by configuring the result of performing a modulo-2 operation on a bit string, performing an exclusive OR operation between the first operation code and the second operation code. , generating an n-bit seed code, then applying the seed code as an input to a preset hash function to generate a first hash value, and when the first hash value is generated, the first content data, After generating second encrypted data by encrypting it with a first hash value, it may include transmitting the second encrypted data, information about the first type, and the hash function to the first user terminal. .

At this time, the first user terminal stores the serial number table in memory, and when the second encryption data, information about the first type, and the hash function are received from the NFT transfer service server, the After extracting the first serial number corresponding to the first type from the serial number table, the first serial number is divided into n digits of the first partial serial number on the left and n digits on the right with respect to the central axis. is divided by the second partial serial number, and the result of performing modulo-2 operation on each of the n numbers constituting the first partial serial number is configured into a bit string to form the n-bit first partial serial number. 1 operation code is generated, and the result of performing modulo-2 operation on each of the n numbers constituting the second partial serial number is configured as a bit string to generate the n-bit second operation code. After generation, the seed code is generated by performing an exclusive OR operation between the first operation code and the second operation code, and the seed code is applied as an input to the hash function to generate the first hash value. Afterwards, the first content data can be restored by decrypting the second encrypted data using the first hash value.

In addition, according to an embodiment of the present invention, the method of operating the NFT previous issuance service server is after the previous issuance completion message is generated and transmitted to the first user terminal, from the first user terminal, the first replacement When a sales registration request command requesting to register sales information about NFT in a sales information database is received, requesting to transmit sales amount information for sale of the first alternative NFT to the first user terminal, From the first user terminal, when the first sales amount information is received as the sales amount information of the first replacement NFT, by storing the first sale amount information for the first replacement NFT in the sales information database, the first 1 Processing sales registration for the replacement NFT, after the sales registration for the first replacement NFT is processed, from the second user terminal of the second user, which is one of the plurality of users, the first replacement NFT When a purchase request command for is received, requesting to transmit payment method information for payment to the second user terminal; When first payment method information is received from the second user terminal, the first payment Based on the means information, processing the payment for the amount according to the first sales amount information and when the payment processing for the amount according to the first sales amount information is completed, from the second user terminal, After receiving the second owner identification information, which is the owner identification information of the second user, ownership transfer information instructing to change the first owner identification information included in the first replacement NFT to the second owner identification information By creating an included second transaction and registering the second transaction in the second blockchain network, the first owner identification information included in the first alternative NFT registered in the second blockchain network is , and may further include processing the information to be changed to the second owner identification information.

Above, with reference to FIG. 2, the operation method of the NFT transfer service server according to an embodiment of the present invention has been described. Here, the operating method of the NFT pre-issuing service server according to an embodiment of the present invention may correspond to the configuration of the operation of the NFT pre-issuing service server 110 described using FIG. 1, so a more detailed description thereof is provided. Decided to omit it.

The operating method of the NFT transfer issuance service server that provides NFT transfer issuance services between blockchains according to an embodiment of the present invention may be implemented as a computer program stored in a storage medium for execution through combination with a computer.

In addition, the operating method of the NFT transfer issuance service server that provides NFT transfer issuance services between blockchains according to an embodiment of the present invention is implemented in the form of program instructions that can be executed through various computer means and stored in a computer-readable medium. can be recorded The computer-readable medium may include program instructions, data files, data structures, etc., singly or in combination. Program instructions recorded on the medium may be specially designed and constructed for the present invention or may be known and usable by those skilled in the art of computer software. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tapes, optical media such as CD-ROMs and DVDs, and magnetic media such as floptical disks. -Includes optical media (magneto-optical media) and hardware devices specifically configured to store and execute program instructions, such as ROM, RAM, flash memory, etc. Examples of program instructions include machine language code, such as that produced by a compiler, as well as high-level language code that can be executed by a computer using an interpreter, etc.

As described above, the present invention has been described with specific details such as specific components and limited embodiments and drawings, but this is provided only to facilitate a more general understanding of the present invention, and the present invention is not limited to the above embodiments. , those skilled in the art can make various modifications and variations from this description.

Accordingly, the spirit of the present invention should not be limited to the described embodiments, and the scope of the patent claims described below as well as all modifications that are equivalent or equivalent to the scope of this patent claim shall fall within the scope of the spirit of the present invention. .

110: NFT transfer issuance service server
111: Owner verification unit 112: Information extraction unit
113: NFT deactivation processing unit 114: Replacement NFT generation unit
115: Previously issued message transmission unit 116: Public key storage unit
117: Electronic signature request unit 118: Data extraction unit
119: Verification processing unit 120: Content data receiving unit
121: Confirmation request unit 122: Deactivation processing unit
123: Serial number table maintenance unit 124: Encryption event generation unit
125: Serial number extraction unit 126: Serial number division unit
127: Operation code generation unit 128: Hash value generation unit
129: Transmission unit 130: Sales amount request unit
131: Sales registration processing unit 132: Sales information database
133: Payment method request unit 134: Payment processing unit
135: Transaction registration processing unit 140: Cloud server
150: first user 155: first user terminal
160: second user 165: second user terminal
10: The first blockchain network
11, 12, 13, 14, 15, 16: a plurality of first nodes
20: Second blockchain network
21, 22, 23, 24, 25, 26: a plurality of second nodes

Claims (12)

In the NFT transfer issuance service server that provides NFT (Non-Fungible Token) transfer issuance services between blockchains,
A first NFT registered in a preset first blockchain network from a first user terminal of a first user who is one of a plurality of users subscribed to the NFT previous issuance service - the first NFT is a preset cloud server As an NFT for first content data stored in, the first NFT includes information about a first storage path on the cloud server where the first content data is stored, and owner information of the first NFT. Contains the user's first owner identification information - As the first NFT identification information for is received, a transfer issuance request command for the first NFT from the first blockchain network to a preset second blockchain network is issued. When received, based on the first NFT identification information, the first NFT registered in the first blockchain network is searched and the owner information of the first NFT included in the first NFT is confirmed, An owner verification unit that verifies whether the owner of the first NFT is the first user;
When verification is completed that the owner of the first NFT is the first user, an information extraction unit for extracting information about the first storage path and the first owner identification information included in the first NFT;
When the information about the first storage path and the first owner identification information are extracted, a first transaction containing destruction information indicating that the first NFT has been destroyed is created, and then the first transaction is sent to the first block An NFT deactivation processing unit that deactivates the first NFT by registering it in the chain network;
When the first NFT is deactivated, a replacement NFT generator that generates a first replacement NFT containing information about the first storage path and the first owner identification information; and
When the first replacement NFT is created, by registering the first replacement NFT in the second blockchain network, after completing the issuance of the first replacement NFT, the first NFT is transferred to the first blockchain network. A transfer completion message transmission unit that generates a transfer completion message indicating completion of transfer from the network to the second blockchain network and transmits it to the first user terminal.
NFT transfer service server containing. According to paragraph 1,
The owner verification department
a public key storage unit storing a public key corresponding to a pre-issued private key for each of the plurality of users - the private key is pre-stored in a user terminal of each of the plurality of users;
When the first NFT identification information is received from the first user terminal and the previous issuance request command is received, the data for the first NFT identification information is stored in the public key storage unit. After generating the first encrypted data by encrypting it with the first public key corresponding to the first private key issued in advance, while transmitting the first encrypted data to the first user terminal, the first encrypted data An electronic signature request unit that requests to generate and transmit an electronic signature value as a basis;
In response to a request to transmit the electronic signature value, from the first user terminal, a first electronic signature value - the first electronic signature value is, the first user terminal transmits the first encryption data, the first user terminal Decrypt with the first private key stored in to restore the data for the first NFT identification information, and concatenate the data for the restored first NFT identification information and the data for the first owner identification information. After generating the concatenated data, it is an electronic signature value generated by encrypting the concatenated data with the first private key. When received, the concatenated data is restored by decrypting the first electronic signature value with the first public key. After, by removing data about the first NFT identification information from the restored concatenated data, a data extraction unit for extracting data about the first owner identification information; and
When data on the first owner identification information is extracted, the first NFT registered in the first blockchain network is searched based on the first NFT identification information, and the first NFT included in the first NFT is searched. A verification processing unit that verifies whether the owner of the first NFT is the first user by checking whether the owner information of the first NFT matches the first owner identification information.
NFT transfer service server containing. According to paragraph 1,
The NFT deactivation processing unit
Once the information on the first storage path and the first owner identification information are extracted, the cloud server is accessed and stored on the first storage path from the cloud server based on the information on the first storage path. a content data receiving unit that receives the first content data;
When the first content data is received, a confirmation request message instructing to confirm whether the first content data is content data for the first NFT while transmitting the first content data to the first user terminal. A confirmation request unit that transmits a; and
When a feedback message is received from the first user terminal indicating that the first content data has been confirmed to be correct content data for the first NFT, after generating the first transaction including the extinction information, the Deactivation processing unit that deactivates the first NFT by registering the first transaction in the first blockchain network
NFT transfer service server containing. According to paragraph 3,
The confirmation request section is
A serial number table in which different 2n (n is a natural number of 2 or more) digit serial numbers corresponding to each of the plurality of preset content data types that are pre-shared with the user terminals of each of the plurality of users are recorded. A serial number table maintenance unit that stores and maintains;
an encryption event generator that generates an encryption event to encrypt the first content data when the first content data is received from the cloud server;
When the encryption event occurs, the type of the first content data is confirmed, and when the type of the first content data is confirmed as the first type, a first serial number corresponding to the first type is selected from the serial number table. A serial number extraction unit that extracts;
When the first serial number is extracted, the first serial number is divided into a first partial serial number of n digits on the left and a second partial serial number of n digits on the right, based on the central axis of the first serial number. a serial number division unit;
When the first serial number is divided into the first partial serial number and the second partial serial number based on the central axis, modulo-2 (Modulo) for each of the n numbers constituting the first partial serial number -2) An n-bit first operation code is generated by organizing the result value when performing the operation into a bit string, and modulo-2 operation is performed on each of the n numbers constituting the second partial serial number. an operation code generator that generates an n-bit second operation code by configuring the result of the operation into a bit string;
By performing an exclusive OR (XOR) operation between the first operation code and the second operation code, an n-bit seed code is generated, and then the seed code is applied as an input to a preset hash function to generate the first A hash value generator that generates a hash value; and
When the first hash value is generated, the first content data is encrypted with the first hash value to generate second encrypted data, and then, to the first user terminal, the second encrypted data and the first A transmission unit that transmits information about the type and the hash function
Including,
The first user terminal is
The serial number table is stored in memory, and when the second encryption data, information about the first type, and the hash function are received from the NFT transfer service server, from the serial number table, the first After extracting the first serial number corresponding to the type, the first serial number is divided into the n-digit first partial serial number on the left and the n-digit second partial serial number on the right, based on the central axis. Generating the n-bit first operation code by dividing and configuring the result of performing modulo-2 operation on each of the n numbers constituting the first partial serial number into a bit string, After generating the n-bit second operation code by configuring the result value of performing the modulo-2 operation on each of the n numbers constituting the second partial serial number as a bit string, the first operation code is performed. By performing an exclusive OR operation between the code and the second operation code, the seed code is generated, the seed code is applied as an input to the hash function to generate the first hash value, and then the second encrypted data is generated. , NFT transfer service server, characterized in that restoring the first content data by decrypting it with the first hash value. According to paragraph 1,
After the previous issuance completion message is generated and transmitted to the first user terminal, a sales registration request command requesting to register sales information for the first alternative NFT in the sales information database is received from the first user terminal. When done, a sales amount request unit requesting to transmit sales amount information for sale of the first alternative NFT to the first user terminal;
When the first sales amount information is received from the first user terminal as the sales amount information of the first replacement NFT, by storing the first sale amount information for the first replacement NFT in the sales information database, A sales registration processing unit that processes sales registration for the first alternative NFT;
After the sales registration for the first alternative NFT is processed, if a purchase request command for the first alternative NFT is received from the second user terminal of the second user, which is one of the plurality of users, the second a payment method request unit that requests transmission of payment method information for payment to the user terminal;
When first payment method information is received from the second user terminal, a payment processing unit that processes payment for an amount according to the first sales amount information based on the first payment method information; and
When payment processing for the amount according to the first sale amount information is completed, after receiving the second owner identification information, which is the owner identification information of the second user, from the second user terminal, the first replacement NFT By creating a second transaction containing ownership transfer information instructing to change the included first owner identification information to the second owner identification information, and registering the second transaction in the second blockchain network, A transaction registration processing unit that processes the first owner identification information included in the first alternative NFT registered in the second blockchain network to be changed to the second owner identification information.
NFT transfer issuance service server further comprising. In the operating method of the NFT transfer issuance service server that provides NFT (Non-Fungible Token) transfer issuance services between blockchains,
From the first user terminal of a first user who is one of a plurality of users subscribed to the NFT transfer service, a first NFT registered in a preset first blockchain network - the first NFT is a preset cloud server As an NFT for first content data stored in, the first NFT includes information about a first storage path on the cloud server where the first content data is stored, and owner information of the first NFT. Contains the user's first owner identification information - As the first NFT identification information for is received, a transfer issuance request command for the first NFT from the first blockchain network to a preset second blockchain network is issued. When received, based on the first NFT identification information, the first NFT registered in the first blockchain network is searched and the owner information of the first NFT included in the first NFT is confirmed, Verifying whether the owner of the first NFT is the first user;
When verification is completed that the owner of the first NFT is the first user, extracting information about the first storage path and the first owner identification information included in the first NFT;
When the information about the first storage path and the first owner identification information are extracted, a first transaction containing destruction information indicating that the first NFT has been destroyed is created, and then the first transaction is sent to the first block Deactivating the first NFT by registering it in the chain network;
When the first NFT is deactivated, generating a first replacement NFT containing information about the first storage path and the first owner identification information; and
When the first replacement NFT is created, by registering the first replacement NFT in the second blockchain network, after completing the issuance of the first replacement NFT, the first NFT is transferred to the first blockchain network. Generating a transfer issuance completion message indicating that the transfer from the network to the second blockchain network has been completed and transmitting it to the first user terminal.
Method of operation of NFT transfer service server including. According to clause 6,
The step of verifying whether the first user is correct is
Maintaining a public key storage unit in which a public key corresponding to a pre-issued private key for each of the plurality of users is stored - the private key is pre-stored in a user terminal of each of the plurality of users. ;
When the first NFT identification information is received from the first user terminal and the previous issuance request command is received, the data for the first NFT identification information is stored in the public key storage unit. After generating the first encrypted data by encrypting it with the first public key corresponding to the first private key issued in advance, while transmitting the first encrypted data to the first user terminal, the first encrypted data Requesting to generate and transmit an electronic signature value as a basis;
In response to a request to transmit the electronic signature value, from the first user terminal, a first electronic signature value - the first electronic signature value is, the first user terminal transmits the first encryption data, the first user terminal Decrypt with the first private key stored in to restore the data for the first NFT identification information, and concatenate the data for the restored first NFT identification information and the data for the first owner identification information. After generating the concatenated data, it is an electronic signature value generated by encrypting the concatenated data with the first private key. When received, the concatenated data is restored by decrypting the first electronic signature value with the first public key. After, removing data about the first NFT identification information from the restored concatenated data, extracting data about the first owner identification information; and
When data on the first owner identification information is extracted, the first NFT registered in the first blockchain network is searched based on the first NFT identification information, and the first NFT included in the first NFT is searched. Verifying whether the owner of the first NFT is the first user by checking whether the owner information of the first NFT matches the first owner identification information.
Method of operation of NFT transfer service server including. According to clause 6,
The step of deactivating the first NFT is
Once the information on the first storage path and the first owner identification information are extracted, the cloud server is accessed and stored on the first storage path from the cloud server based on the information on the first storage path. receiving the first content data;
When the first content data is received, a confirmation request message instructing to confirm whether the first content data is content data for the first NFT while transmitting the first content data to the first user terminal. transmitting; and
When a feedback message is received from the first user terminal indicating that the first content data has been confirmed to be correct content data for the first NFT, after generating the first transaction including the extinction information, the Deactivating the first NFT by registering the first transaction in the first blockchain network
Method of operation of NFT transfer service server including. According to clause 8,
The step of transmitting the confirmation request message is
A serial number table in which different 2n (n is a natural number of 2 or more) digit serial numbers corresponding to each of the plurality of preset content data types that are pre-shared with the user terminals of each of the plurality of users are recorded. storing and maintaining;
When the first content data is received from the cloud server, generating an encryption event to encrypt the first content data;
When the encryption event occurs, the type of the first content data is confirmed, and when the type of the first content data is confirmed as the first type, a first serial number corresponding to the first type is selected from the serial number table. Extracting;
When the first serial number is extracted, the first serial number is divided into a first partial serial number of n digits on the left and a second partial serial number of n digits on the right, based on the central axis of the first serial number. steps;
When the first serial number is divided into the first partial serial number and the second partial serial number based on the central axis, modulo-2 (Modulo) for each of the n numbers constituting the first partial serial number -2) An n-bit first operation code is generated by organizing the result value when performing the operation into a bit string, and modulo-2 operation is performed on each of the n numbers constituting the second partial serial number. generating an n-bit second operation code by configuring the result of the operation into a bit string;
By performing an exclusive OR (XOR) operation between the first operation code and the second operation code, an n-bit seed code is generated, and then the seed code is applied as an input to a preset hash function to generate the first generating a hash value; and
When the first hash value is generated, the first content data is encrypted with the first hash value to generate second encrypted data, and then, to the first user terminal, the second encrypted data and the first transmitting information about the type and the hash function
Including,
The first user terminal is
The serial number table is stored in memory, and when the second encryption data, information about the first type, and the hash function are received from the NFT transfer service server, from the serial number table, the first After extracting the first serial number corresponding to the type, the first serial number is divided into the n-digit first partial serial number on the left and the n-digit second partial serial number on the right, based on the central axis. Generating the n-bit first operation code by dividing and configuring the result of performing modulo-2 operation on each of the n numbers constituting the first partial serial number into a bit string, After generating the n-bit second operation code by configuring the result value of performing the modulo-2 operation on each of the n numbers constituting the second partial serial number as a bit string, the first operation code is performed. By performing an exclusive OR operation between the code and the second operation code, the seed code is generated, the seed code is applied as an input to the hash function to generate the first hash value, and then the second encrypted data is generated. , A method of operating an NFT transfer service server, characterized in that restoring the first content data by decrypting it with the first hash value. According to clause 6,
After the previous issuance completion message is generated and transmitted to the first user terminal, a sales registration request command requesting to register sales information for the first alternative NFT in the sales information database is received from the first user terminal. When done, requesting to transmit sales amount information for sale of the first alternative NFT to the first user terminal;
When the first sales amount information is received from the first user terminal as the sales amount information of the first replacement NFT, by storing the first sale amount information for the first replacement NFT in the sales information database, Processing sales registration for the first alternative NFT;
After the sales registration for the first alternative NFT is processed, if a purchase request command for the first alternative NFT is received from the second user terminal of the second user, which is one of the plurality of users, the second Requesting to transmit payment method information for payment to the user terminal;
When first payment method information is received from the second user terminal, processing a payment for an amount according to the first sales amount information based on the first payment method information; and
When payment processing for the amount according to the first sale amount information is completed, after receiving the second owner identification information, which is the owner identification information of the second user, from the second user terminal, the first replacement NFT By creating a second transaction containing ownership transfer information instructing to change the included first owner identification information to the second owner identification information, and registering the second transaction in the second blockchain network, Processing the first owner identification information included in the first alternative NFT registered in the second blockchain network to be changed to the second owner identification information.
A method of operating an NFT transfer service server further comprising: A computer-readable recording medium recording a computer program for executing the method of any one of claims 6 to 10 through combination with a computer. A computer program stored in a storage medium for executing the method of any one of claims 6 to 10 through combination with a computer.

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