KR102119784B1 - System and method for providing service based on blockchain using electronic code - Google Patents

Abstract

A method of operating a first node on a network of a blockchain that distributes and manages a ledger recording a service usage history using an electronic code, the first method of scanning a first electronic code of the same type as the electronic code from a terminal of a business operator Receiving a first scheduled usage of the service using data and the first electronic code; And extracting first encrypted data used to record the usage history of the service in the ledger from the first data. Verifying the validity of the first scheduled usage history based on the first history information of the service for the first encrypted data and the first electronic code recorded in the ledger; And it may include the step of transmitting the result of verifying the validity of the first scheduled usage details to the terminal of the operator.

Description

System and method for providing blockchain-based services using electronic codes {SYSTEM AND METHOD FOR PROVIDING SERVICE BASED ON BLOCKCHAIN USING ELECTRONIC CODE}

It relates to a system and method for providing a blockchain-based service using electronic codes.

Recently, as the use of electronic money has become widespread, electronic gift certificates similar to offline gift certificates have been widely used. Such electronic vouchers may also be referred to as gifticons, and are actively distributed online with barcodes or unique identification numbers.

The electronic voucher serves as a currency that can be exchanged for a real product, and the buyer purchases the electronic voucher by paying a certain amount online or offline. The purchased electronic voucher can be gifted to a specific person, and the specific person who received the electronic voucher has the advantage of being able to exchange the actual product corresponding to the electronic voucher with a real product wherever there is a specific merchant.

However, if the barcode or the unique identification number constituting the electronic voucher is leaked, regardless of the intention of the holder of the electronic voucher, the electronic voucher can be used by using the leaked barcode or the unique identification number. Can damage it.

Therefore, it is required to strengthen security in the use of items that can be distributed, such as electronic vouchers.
On the other hand, with regard to the electronic voucher, Prior Art Document 1 (Public Patent Publication 10-2016-0150419) discloses a payment method and system using a barcode. In addition, prior art document 2 (published patent publication 10-2015-0061145) discloses a method and system for providing an electronic voucher to a user terminal.

It aims to provide a system that provides blockchain-based services to improve the security of services provided using electronic codes.

According to one side, in the operation method of the first node on the network of the blockchain that distributes and manages the ledger that records the usage history of the service using the electronic code, the first electronic code of the same type as the electronic code from the terminal of the operator Receiving a first scheduled usage of the service using the scanned first data and the first electronic code; And extracting first encrypted data used to record the usage history of the service in the ledger from the first data. Verifying the validity of the first scheduled usage history based on the first history information of the service for the first encrypted data and the first electronic code recorded in the ledger; And transmitting a result of verifying the validity of the first scheduled usage details to a terminal of the operator.

According to another side, a recording medium readable by a computer recording a program for executing a method of operating a first node on a network of a blockchain that distributes and manages a ledger recording a service history using electronic codes is provided by a computer do.

According to another aspect, a communication device that communicates with nodes and external devices on a network of a blockchain that distributes and manages a ledger that records usage history of a service using an electronic code; Processor; And a memory for storing instructions executable by the processor, wherein the processor executes the instructions to scan first data and first data of the same type as the electronic code from the operator's terminal. 1 A method used to receive a first usage schedule of the service using an electronic code through the communication device and to record a usage history of the service using the first electronic code from the first data to the ledger 1 Extracting the encrypted data, and verifying the validity of the first scheduled use history based on the first history information of the service for the first encrypted data and the first electronic code recorded in the ledger, 1 A node is provided that transmits a result of verifying the validity of the schedule to be used to the terminal of the operator through the communication device.

According to another aspect, the communication device; Processor; And a memory for storing instructions executable by the processor, wherein the processor generates first data including information used to provide a first service by executing the instructions, and the first At least one on the network of the blockchain that manages by distributing and managing the ledger that records the usage history of the service by using the electronic code to generate the first encrypted data by encrypting the first data using the first encryption key allocated to the data. The first encryption data and the first decryption key assigned to the first data are transmitted to the terminal of a plurality of operators that use the node or the electronic code to provide the service, and the first encryption is performed. A server is provided that generates the first electronic code including data and distributes the first electronic code to an external device.

By providing services using electronic codes based on blockchain, it is possible to provide services with enhanced security.

The present disclosure can be easily understood by the following detailed description and combinations of the accompanying drawings, and reference numerals refer to structural elements.
1 is a conceptual diagram illustrating a method of providing a service using an electronic code based on a blockchain, according to an embodiment.
2 is a flowchart for explaining a method of providing a service using an electronic code based on a blockchain, according to an embodiment.
3 is a flowchart for explaining a method of operating a node on a network of a blockchain that distributes and manages a ledger recording a usage history of a service using an electronic code according to an embodiment.
4 is a flowchart for explaining a method of operating a node on a network of a blockchain according to a result of verifying the validity of a first scheduled use schedule according to an embodiment.
5 is a diagram for explaining a method of verifying the validity of a first scheduled usage history at a node on a network of a blockchain, according to an embodiment.
FIG. 6 is a diagram for explaining a process of encrypting the first data scanned by the operator's terminal and the first scheduled use history, and transmitting the encrypted data to a node on a blockchain network, according to an embodiment.
7 is a diagram for verifying the validity of information transmitted from a terminal of an operator at a node on a network of a blockchain, according to an embodiment, and present information and first use of a service included in first data scanned by a first electronic code It is a diagram for explaining a process of acquiring scheduled history information.
FIG. 8 is a diagram for explaining a process of verifying the validity of a first scheduled use history by comparing current information of a service and history information of a first electronic code at a node on a blockchain network according to an embodiment.
9 is a block diagram for explaining the structure of a block and a blockchain related to a ledger recording a usage history of a service using an electronic code according to an embodiment.
10 is a block diagram showing the configuration of a node on a network of a blockchain, according to an embodiment.
11 is a flowchart illustrating an operation method of a server that generates and distributes electronic code including information used to provide a predetermined service according to an embodiment.
12 is a block diagram showing a configuration of a server that generates and distributes electronic codes including information used to provide a predetermined service according to an embodiment.

Hereinafter, various embodiments will be described in detail with reference to the drawings. The embodiments described below may be implemented in various different forms. In order to more clearly describe the features of the embodiments, detailed descriptions of the matters well known to those skilled in the art to which the following embodiments pertain will be omitted.

Meanwhile, in the present specification, when a component is "connected" with another component, this includes not only a case of'directly connecting', but also a case of'connecting with other components in between'. In addition, when it is said that a configuration "includes" another configuration, this means that unless otherwise stated, other configurations may be excluded and other configurations may be included.

In addition, terms including an ordinal number such as'first' or'second' used in the present specification can be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from other components.

In the present specification, "blockchain" is a ledger that utilizes software elements composed of algorithms in which blocks connected in order to negotiate service usage information using encryption and security technologies in order to secure and maintain integrity. It may mean a distributed peer-to-peer (P2P) system. Here, the distributed P2P system may be a special form of the distributed system. In addition, in a P2P system, all nodes of a network can provide resources (processing power, storage space, data or network bandwidth, etc.) to each other without coordination of a central node. Further, "blockchain" may mean a distributed ledger technology in which nodes in a network are jointly recorded and managed by distributing the ledger recording the usage history information to a P2P network rather than a central server of a specific institution.

In the present specification, "hash function" may mean a function that converts any type of data into a fixed-length number regardless of the length of input data. The hash function can calculate a hash value using bits and bytes composing input data.

In the present specification, "terminal" may be a smart phone, a tablet PC, a PC, a TV, a smart TV, a mobile phone, a personal digital assistant (PDA), a laptop, or a non-mobile computing device, but is not limited thereto.

In this specification, "node" may mean a component within a network of blockchains. For example, the node is a special-purpose computer, a general-purpose computer, a supercomputer, a mainframe computer, a personal computer, a smartphone, and a tablet PC. Etc., but is not limited thereto.

1 is a conceptual diagram illustrating a method of providing a service using an electronic code based on a blockchain, according to an embodiment.

The server 10 can generate and distribute electronic codes used to provide services based on a blockchain. Here, the administrator managing the server 10 may be a provider that generates and distributes electronic codes so that services can be provided smoothly.

The server 10 may generate information used to provide a predetermined service. For example, the service may be a voucher use service, a ticket use service, a rechargeable ticket use service, an employee ID card service equipped with a predetermined payment function, and an application service providing a predetermined payment function, which are not limited thereto. Does not. In addition, the ticket use service may include a ticket use service such as a disposable boarding pass use service, a regular boarding pass use service, or an admission ticket, but is not limited thereto.

For example, when the service is a gift certificate use service, the server 10 may generate information necessary for issuing a gift certificate. Specifically, the information required for issuance of the gift certificate may include information on at least one of the type of the gift certificate, the code number of the gift certificate, the amount of the gift certificate, the expiration date of the gift certificate, and the customers who can use the gift certificate.

The server 10 may generate encrypted data by encrypting information used to provide the generated service. The server 10 may transmit the generated encrypted data to the node 20 of the network of the blockchain that distributes and manages the ledger recording the service usage history. Here, the node 20 may be a server of a provider that generates and distributes an electronic code, or a server of a plurality of operators to provide a service using the electronic code. In addition, the server 10 may transmit the generated encrypted data to each terminal of a plurality of operators.

The server 10 may generate an electronic code including encrypted data. Here, the electronic code may be one of a QR code, a barcode, a color code, and a code composed of letters or symbols, but is not limited thereto. The server 10 may transmit the electronic code to an external device that has requested the electronic code. For example, the server 10 may sell the issued gift certificate online. The server 10 may transmit an electronic code to the terminal 40 of the user who purchased the gift certificate. In FIG. 1, the electronic code shows a configuration in which the server 10 transmits to the user's terminal 40, but the electronic code may also be provided as a paper feed with the electronic code printed offline.

As shown in FIG. 1, the terminal 30 of the first operator may acquire first data that is scanned online or offline by the first electronic code held by the first user. In addition, the terminal 30 of the first operator may obtain a schedule of use of the service using the first electronic code. Here, "scan" may mean a method of reading an electronic code. For example, the terminal 30 of the first operator may read an electronic code offline using a NFC (Near Field Communication) method or a Bluetooth Low Energy (BLE) barcode method.

The terminal 30 of the first operator may check whether a predetermined service can be performed based on the first electronic code. Specifically, the terminal 30 of the first operator performs validation of the scheduled usage details on whether the service corresponding to the expected usage history can be performed based on the encrypted data included in the first electronic code on the blockchain network. A request may be made to the first node 20 among the nodes 20, 20-2, 20-3, 20-4, and 20-5. The first node 20 on the network of the blockchain can verify the validity of the schedule to be used based on the encryption data included in the first electronic code and the service history information for the first electronic code recorded in the ledger. . The first node 20 on the network of the blockchain may transmit the result of verifying the validity of the schedule to be used to the terminal 30 of the first operator.

2 is a flowchart for explaining a method of providing a service using an electronic code based on a blockchain, according to an embodiment.

In step S201, the server 10 may generate encrypted data including information used to provide a predetermined service. Specifically, the server 10 may generate information used to provide a predetermined service, and encrypt the generated information to generate encrypted data. Here, the encryption key used when encrypting information may be uniquely assigned to the information. For example, the server 10 may generate first information necessary for issuing a first gift certificate to provide a gift certificate use service. The server 10 may generate the first encrypted data by encrypting the first information using the first encryption key uniquely assigned to the first information.

In step S202, the server 10 may transmit the encrypted data to the node 20 on the network of the blockchain that distributes and manages the ledger recording the usage history of the service using the electronic code. In addition, the server 10 may transmit a decryption key capable of decrypting the encrypted data to the node 20 on the network of the blockchain. Nodes 20, 20-2, 20-3, 20-4, and 20-5 on the network of the blockchain decrypt the encrypted data received from the server 10 and generate it from the decrypted data in the server 10 Can obtain the initial information. Nodes (20, 20-2, 20-3, 20-4, 20-5) on the network of the blockchain can record initial information in the ledger, and then use the received information from the terminal 30 of the operator Initial information can be used to verify the validity of the statement.

In addition, in step S203, the server 10 may transmit the encrypted data to the terminal 30 of the operator. In addition, the server 10 may transmit a decryption key capable of decrypting the encrypted data to the operator's terminal 30.

In step S204, the server 10 may generate an electronic code including encrypted data. Here, the electronic code may be one of a QR code, a barcode, a color code, and a code composed of letters or symbols. The server 10 may distribute electronic codes to external devices. In step S205, the server 10 may transmit the first electronic code to the user's terminal 40.

In step S206, the user's terminal 40 may request the provision of the service to the operator's terminal 30 using the first electronic code.

In step S207, the operator's terminal 30 may acquire the first data scanned by the first electronic code. Here, "scan" may mean a method of reading an electronic code. For example, the terminal 30 of the first operator may read an electronic code offline using a NFC (Near Field Communication) method or a Bluetooth Low Energy (BLE) barcode method. In step S208, the operator's terminal 30 may obtain a first scheduled use schedule according to a request for providing a service received from the user terminal. For example, when the service is a gift voucher use service, the first scheduled use may be using a gift voucher 50,000 won. For another example, when the service is a ticket-use service, the first scheduled use schedule may be to use a ticket.

In step S209, the operator's terminal 30 may transmit the first data and the first scheduled usage information to the node 20 on the blockchain network. That is, the operator's terminal 30 may request the validity of the first scheduled usage details to the node 20 on the blockchain network in order to determine whether a service according to the first usage history is available. Here, the operator's terminal 30 transmits the first data and the first scheduled usage details to a specific node among nodes 20, 20-2, 20-3, 20-4, and 20-5 on the blockchain network. Can be. For example, a specific node may be a server of an operator managing a ledger that records a service usage history for an electronic code. Further, the specific node may be a server of a provider that generates and distributes the first electronic code.

In step S210, the node 20 on the network of the blockchain may verify the validity of the first scheduled usage history based on the first encryption data included in the first data and the first history information recorded in the ledger. The detailed process of verifying the validity of the schedule to be used by the node 20 on the network of the blockchain will be described in FIGS. In step S211, the node 20 may transmit a result of verifying the validity of the first scheduled usage details to the terminal 30 of the operator.

In step S212, if the first use schedule is valid, the operator's terminal 30 may provide a service corresponding to the first use schedule to the user's terminal 40. In addition, the operator's terminal 30 may transmit the first usage history for the service to the user's terminal 40. In step S213, the operator's terminal 30 may transmit the first usage history to the node 20.

In step S214, the node 20 may record the first usage history in the ledger. The process of recording the usage history in the ledger at the node 20 on the network of the blockchain will be described in FIGS. 4 to 8. In step S215, the node 20 may transmit a message informing the server 10 that the first usage history and the first usage history are recorded in the ledger.

3 is a flowchart for explaining a method of operating a node on a network of a blockchain that distributes and manages a ledger recording a usage history of a service using an electronic code according to an embodiment.

In step S310, the node 20 may receive the first data scheduled to use the first data scanned by the operator's terminal 30 and the service using the first electronic code. The node 20 may receive a validity verification request for the first scheduled use of the service from the terminal 30 of the operator. In addition, the node 20 may receive initial information included in each of the electronic codes of the same type as the electronic code from the server 10 that generates and distributes the electronic code. The node 20 may record the initial information in the ledger, and may refer to the initial information to verify the validity of the first scheduled use. In addition, the node 20 may receive a decryption key of each of the electronic codes used to decrypt the encrypted data included in each of the electronic codes from the server 10.

In step S320, the node 20 may extract the first encryption data used to record the service usage history in the ledger from the first data. The first encrypted data may include information used to determine whether a service according to the first scheduled use is available. For example, if the service is a gift certificate use service, the first encrypted data is data in which information on at least one of the type of gift certificate, the code number of the gift certificate, the amount of the gift certificate, the expiration date of the gift certificate, and the customer who can use the gift certificate is encrypted. Can be

In step S330, the node 20 may verify the validity of the first scheduled use history based on the first encryption data and the first history information of the service for the first electronic code recorded in the ledger. For example, if the service is a gift certificate use service, the history information of the service for the first electronic code may be history information using the gift certificate using the first electronic code. Specifically, the history information may include information on at least one of the time when the gift certificate was used, the amount used in the gift certificate, and the place where the gift certificate was used. For another example, if the service is a ticket use service, the history information of the service for the first electronic code may be history information using the ticket using the first electronic code. The history information may include at least one information of when the ticket was used and where the ticket was used.

Specifically, the node 20 may decrypt the first encrypted data using the first decryption key of the first electronic code, and obtain current information of a service that can be provided by the first electronic code from the decrypted data. have. For example, if the service is a gift certificate use service, the current information of the service may include at least one of the amount remaining in the gift certificate and the validity period of the gift certificate.

The node 20 may compare the current information of the service with the first history information for the first electronic code recorded in the ledger, and verify the validity of the first scheduled usage based on the comparison result.

The node 20 may check whether there is first history information of the first electronic code corresponding to the current information of the service among the history information recorded in the ledger. The node 20 may verify the validity of the first electronic code based on the verification result. For example, when the ledger has first history information of the first electronic code, the node 20 may determine that the first electronic code is valid.

On the other hand, if the first electronic code is valid, the node 20 compares the first history information of the first electronic code with the current information of the service, and determines whether the first service corresponding to the first scheduled use is available. Can be. When it is determined that the first service corresponding to the first scheduled usage is available, the node 20 may determine that the first scheduled usage is valid.

In step S340, the node 20 may transmit a result of verifying the validity of the first scheduled usage details to the terminal 30 of the operator.

Specifically, when the first scheduled use schedule is valid, the node 20 may transmit a message to approve the first scheduled use schedule to the terminal 30 of the operator. On the other hand, if the first scheduled use schedule is not valid, the node 20 may transmit a message for rejecting the approval of the first scheduled use schedule to the terminal 30 of the operator.

4 is a flowchart for explaining a method of operating a node on a network of a blockchain according to a result of verifying the validity of a first scheduled use schedule according to an embodiment.

Referring to FIG. 4, the operation of the node 20 according to step S340 of FIG. 3 may be subdivided into specific operations according to steps S410, S420 and S430 of FIG. 4. In step S410, the node 20 may determine whether the first scheduled use is valid. In step S420, if the first scheduled usage is valid, the node 20 may transmit a message to approve the first scheduled usage to the terminal 30 of the operator. In step S430, if the first scheduled usage is not valid, the node 20 may transmit a message to the operator's terminal 30, which rejects the approval of the first scheduled usage.

In step S440, the node 20 may transmit the first scheduled usage details to another node 20 on the blockchain network. Further, the node 20 may record the first scheduled use history in a candidate block.

In step S450, the node 20 may receive the first usage history of the service according to the first usage schedule from the operator's terminal 30.

In step S460, the node 20 may reflect the first usage history in the first usage schedule recorded in the candidate block.

In step S470, the node 20 may perform a proof-of-work of a candidate block reflecting a plurality of usage details for the service, and add the candidate block to the blockchain as a valid block.

In FIGS. 5 to 9, in relation to the service, a gift voucher use service will be described, but this is not restrictive, and may be applied to various services. For example, the methods described in FIGS. 5 to 9 may be equally applied to a ticket use service, a rechargeable ticket use service, an employee ID service equipped with a predetermined payment function, and an application service providing a predetermined payment function. In addition, the ticket use service may include, but is not limited to, a ticket use service such as a disposable boarding pass use service, a regular boarding pass use service, or an admission ticket.

5 is a diagram for explaining a method of verifying the validity of a first scheduled usage history at a node on a network of a blockchain, according to an embodiment.

Referring to FIG. 5, the operator's terminal 30 may acquire first data scanned by the first electronic code held by the first user. Here, "scan" may mean a method of reading an electronic code. For example, the operator terminal 30 may read the first electronic code using at least one of an NFC chip, a Bluetooth chip, and a barcode reader.

For example, the operator's terminal 30 may obtain the first data by scanning the first electronic code from a branch containing the first electronic code held by the first user while offline. In addition, the operator's terminal 30 may acquire the first data by scanning the first electronic code displayed on the terminal 40 of the first user offline. In addition, the operator's terminal 30 may acquire the first data that is scanned from the first user's terminal 40 online by scanning the first electronic code.

The operator's terminal 30 may obtain a first scheduled usage of the service to be provided using the first electronic code. For example, a service to be provided using the first electronic code may be A gift certificate use service. The operator's terminal 30 may obtain a first scheduled use history of "paying 50,000 with an A gift certificate."

The operator's terminal 30 may transmit the first data and the first scheduled use schedule to the first node 20 on the blockchain network that distributes and manages the ledger recording the service use history.

On the other hand, the first node 20 decrypts the initial information contained in each of the electronic codes of the same type as the electronic code and the encrypted data included in each of the electronic codes from the server 10 that generates and distributes the electronic code. It is possible to receive a decryption key for each of the electronic codes used for des. For example, when the service provided by using the electronic code is a gift certificate use service, the initial information may include information on the type of gift certificate, the amount issued on the gift certificate, the code number of the gift certificate, and the validity period of the gift certificate. .

The first node 20 may decrypt the first encrypted data using the first decryption key of the first electronic code, and obtain current information of a service that can be provided by the first electronic code. For example, the current information of the service may include information on the amount of money remaining in the A gift certificate, the code number of the A gift certificate, and the validity period of the A gift certificate.

The first node 20 may compare the current information of the service with the first history information of the first electronic code recorded in the ledger, and verify the validity of the first scheduled usage. The first node 20 may verify whether there is first history information of the first electronic code corresponding to the current information of the service among the history information recorded in the ledger, and verify the validity of the first electronic code. If the first electronic code is valid, the first node 20 may compare the first history information of the first electronic code with the current information of the service, and verify the validity of the first scheduled usage. The first node 20 determines whether the first history information matches the current information according to the comparison of the first history information and the current information of the service, and based on the current information, the first node 20 corresponds to the first scheduled use schedule It is possible to determine whether a service can be provided. When the first scheduled use schedule is valid, the first node 20 may transmit a message to approve the first scheduled use schedule to the terminal 30 of the operator. On the other hand, if the first electronic code is invalid or the first scheduled usage is not valid, the first node 20 may transmit a message rejecting the approval of the first scheduled usage to the operator's terminal 30. have.

The first node 20 may transmit a valid first usage schedule to other nodes on the network of the blockchain, and record the first usage schedule in the candidate block 510 in the first node 20. For example, the first node 20 may record the first scheduled usage details using "A gift certificate, code number XXXX-XXXXX of 50,000 won" in the candidate block 510.

On the other hand, when the terminal 30 of the operator receives the message for approving the first scheduled usage from the first node 20, the terminal 30 may provide the first service corresponding to the first scheduled usage to the first user. The operator's terminal 30 may transmit the first usage history to the first node 20. The first node 20 may reflect the first usage history in the first usage history recorded in the candidate block 510. When predetermined usage details are recorded in the candidate block 510, the first node 20 may add the candidate block 510 to the blockchain as a valid block by performing proof of work of the candidate block 510.

In addition, the second node 20-2 may verify the validity of the first scheduled use schedule based on the data received from the first node 20. If it is verified that the first scheduled use history is valid within the second node 20-2, the second node 20-2 may record the first scheduled use history in the candidate block. The second node 20-2 may receive the first usage history from the first node 20 and reflect the first usage history in the first usage schedule. The second node 20-2 may generate a valid block by performing proof of work of the candidate block. The third node 20-3 and the fourth node 20-4 on the network of the blockchain may operate similarly to the second node 20-2.

When the process of generating a valid block in the first node 20 and adding it to the blockchain is described, the first node 20 may calculate the root of the Merkle tree for predetermined usage details. The first node 20 may generate a hash reference indicating the previous block header from the standpoint of the block to be added to the blockchain. The first node 20 may acquire a difficulty required in the proof of work or constraint of the block to be added to the blockchain. The first node 20 may check whether the value of the block hash that is generated by applying the hash function to the root of the Merkle tree, the hash reference pointing to the previous block header, the difficulty, the timestamp data, and the nonce satisfies the constraint. . The first node 20 may increase the nonce from 0 to 1 and obtain a value of the nonce that satisfies the constraint condition to perform proof of work for the candidate block 1220. The first node 20 may add the candidate block 1220 as a valid block to the blockchain. Also, the first node 20 can transmit a valid block to other nodes (20-2, 20-3, 20-4, etc.) on the blockchain network.

Each node (20-2, 20-3, 20-4, etc.) on the blockchain network performs verification on a valid block received from the first node 20, and thus, each node 20-2, 20 -3, 20-4, etc.) You can add valid blocks to the blockchain.

FIG. 6 is a diagram for explaining a process of encrypting the first data scanned by the operator's terminal and the first scheduled use history, and transmitting the encrypted data to a node on a blockchain network, according to an embodiment.

The operator's terminal 30 encrypts the first data 611 that scans the first electronic code 601 and the first use schedule 612, which uses “50,000 won in store A,” and encrypts the information 651 ) To the first node 20 on the blockchain network. Here, the first data 611 of the first electronic code 601 may be data that reads the first electronic code 601 from the operator terminal 30. The operator terminal 30 may read the first electronic code using at least one of an NFC chip, a Bluetooth chip, and a barcode reader.

Specifically, the operator's terminal 30 generates unique data for the first data 611 that scans the first electronic code 601 and for the first use schedule 612, which uses “50,000 won in store A”. By applying it to the hash function, the hash value "DIRAL28A" 621 corresponding to the first data 611 and the first scheduled use history 612 may be generated.

The terminal 30 of the operator encrypts the hash value "DIRAL28A" 621 with the encryption key 631 of the operator terminal, and the first representing a digital signature of the first data 611 and the first scheduled use history 612 The ciphertext "&DIFPW%IDAL!@DIKWSOB" 641 may be generated. The terminal 30 of the operator combines the first cipher text "&DIFPW%IDAL!@DIKWSOB" 641 with the first data 611 and the first expected usage history 612, and the first node 20 with the information 651 Can be transferred to.

7 is a diagram for verifying the validity of information transmitted from a terminal of an operator at a node on a network of a blockchain, according to an embodiment, and present information and first use of a service included in first data scanned by a first electronic code It is a diagram for explaining a process of acquiring scheduled history information.

As illustrated in FIG. 7, the first node 20 combines the first cipher text “&DIFPW%IDAL!@DIKWSOB” 641 from the operator's terminal 30 with the first data and the first scheduled usage information ( 651). The first node 20 may generate a hash value “DIRAL28A” 621 by applying a hash function to the first data in the information 651 and the first scheduled use. The first node 20 decrypts the first ciphertext "&DIFPW%IDAL!@DIKWSOB" 641 using the decryption key 711 of the operator's terminal 30 to generate a hash value "DIRAL28A" 621. Can be. The hash value "DIRAL28A" (621) obtained by applying the hash function to the first data and the first scheduled use, and the hash value "DIRAL28A" obtained by decoding the first ciphertext &DIFPW%IDAL!@DIKWSOB" (641) Since 621 is the same, the first node 20 may determine that the information 651 received from the operator's terminal 30 is valid.

The first node 20 may obtain current information 741 and a first scheduled use history 612 of a service that can be provided by the first electronic code within the information 651 determined to be valid. Specifically, the first node 20 may extract the first encrypted data 721 used to record the usage history of the service in the ledger from the first data 611 that scans the first electronic code. The first node 20 decrypts the first encrypted data 721 using the first decryption key 731 of the first electronic code, and current information 741 of a service that can be provided by the first electronic code Can be obtained. As shown in FIG. 7, the current information 741 of the service may include information on “A gift certificate XXXX-XXXX, balance: 200,000 won, expiration date: 2025.05”.

FIG. 8 is a diagram for explaining a process of verifying the validity of a first scheduled use history by comparing current information of a service and history information of a first electronic code at a node on a blockchain network according to an embodiment.

The first node may compare the current information of the service with the first history information for the first electronic code recorded in the ledger, and verify the validity of the first scheduled use.

Referring to 810 of FIG. 8, the first node 20 may have a ledger recording the usage history of the service using the electronic code. The ledger may consist of a block chain where blocks that record valid usage history information of the service are connected. The first node 20 may obtain current information of the service from the first electronic code. The first node 20 may extract the history information of the first electronic code from the ledger. For example, the first node 20 may include first history information 811 of the first electronic code recorded in the n-1 block and second history information 812 of the first electronic code recorded in the nth block. Can be extracted. The first history information 811 may include information indicating "A gift certificate XXXX-XXXXX 10,000 won, balance: 270,000 won, expiration date: 2025.05". Further, the second history information 812 may include information indicating "A gift certificate XXXX-XXXXX 70,000 won usage, balance: 200,000 won, expiration date: 2025.05".

Referring to 820 of FIG. 8, the first node 20 may obtain current information 821 of a service that can be provided by the first electronic code. For example, the current information 821 of the service may include information indicating "A gift certificate XXXX-XXXX, balance: 200,000 won, expiration date: 2025.05". Also, the first node 20 may check the history information 811 and 812 of the first electronic code in the ledger. If the history information 811 and 812 of the first electronic code is in the ledger, the first node 20 may determine that the first electronic code is valid. The first node 20 may extract first history information 811 and second history information 821 of the first electronic code from the ledger. The first node 20 may compare the second history information 812 that is finally updated among the history information 811 and 812 of the first electronic code with the current information of the service. The first node 20 may check whether the first electronic code has been forged by comparing the second history information 812 with the current information 821 of the service. When the current information 821 of the service and the second history information 812 coincide with each other, the first node 20 provides a first service corresponding to the first scheduled usage based on the current information 821 of the service By determining whether it is possible, the validity of the first scheduled use can be verified. When the first service corresponding to the first scheduled use is to pay 50,000 won in the A store, the first node 20 is information indicating "A gift certificate XXXX-XXXX, balance: 200,000 won, expiration date: 2025.05" Based on the current information 821 of the service, it may be determined that the first service can be provided. The first node 20 may transmit a message to approve the first scheduled use schedule to the terminal 30 of the operator.

9 is a block diagram for explaining the structure of a block and a blockchain related to a ledger recording a usage history of a service using an electronic code according to an embodiment.

As shown in FIG. 9, the blockchain may be configured by connecting blocks that record usage history information of a valid service. That is, the data structure of the blockchain may be a predetermined data structure composed of units in which blocks recording service usage information are arranged in order. In addition, the data structure of the block chain is a data structure in which each block header is linked in a chain format with reference to the previous block header, and the data of the Merkle tree in which the data of the hash reference and the usage history information that points to the data of the usage history information are connected in a tree form. It can be structured.

The block may include a block hash, block header, and usage history information. The block header may include a version of the current program, a hash value of the previous block header, a root of the Merkle tree, a timestamp, difficulty and information of the nonce.

The block hash may be a hash value of a hash function applied using information of a current program version, a hash value of a previous block header, a root of the Merkle tree, a timestamp, difficulty, and nonce as input values. That is, the value of the block hash may be a value that hash the block header, not a value that hash the entire block.

The hash value of the previous block header uniquely identifies each block header and can be used to reference the previous block header. If each block header refers to a previous block header, the order of individual block headers and blocks can be maintained. Referring to FIG. 9, since the first block 910 is the first block and there is no previous block, there is no reference indicating the previous block header. Therefore, the hash value of the previous block header of the first block 910 is 0. In addition, since the second block 920 has the first block 910 which is the previous block, the second block header has a hash value indicating the first block header. Similarly, since the third block 930 has a second block 920 that is a previous block, the third block header has a hash value indicating the second block header.

The Merkle tree may mean a structure in which data of hash reference and usage history information are connected in a tree form. The hash reference may refer to data of the usage history information using an encrypted hash value. Meanwhile, since the encrypted hash value is a unique value of data, different data does not have the same hash value.

When the Merkle tree is generated in detail, a hash indicating each of the data of usage history information (for example, first usage history information, second usage history information, third usage history information, fourth usage history information) References (eg, a first hash reference, a second hash reference, a third hash reference, a fourth hash reference) may be generated. When a hash reference is generated, a hash reference pointing to a pair of hash references (e.g., a 12th hash reference pointing to a first hash reference and a second hash reference, a 34th hash reference pointing to a third hash reference and a fourth hash reference) ) May be generated. Then, an operation of generating a hash reference indicating a pair of hash references may be repeatedly performed to generate a single hash reference (for example, a 12th hash reference and a 1234th hash reference referring to a 34th hash reference). That is, the Merkle tree may be a tree-like structure that starts from a single hash reference and links to data of each usage history information. The root of the Merkle tree may refer to a single hash reference that was finally generated.

The timestamp may indicate the time when the work started to prove the work. Difficulty can mean constraints in proof-of-work or hash puzzles. The nonce may mean a value that is adjusted such that the value of the block hash satisfies the constraint for proof of work.

10 is a block diagram showing the configuration of a node on a network of a blockchain, according to an embodiment.

The node 20 illustrated in FIG. 10 may include a communication device 1010, a memory 1020, and a processor 1030. However, not all of the illustrated components are essential components. The node 20 may be implemented by more components than the illustrated components, and the node 20 may also be implemented by fewer components. Hereinafter, the components will be described. The node 20 illustrated in FIG. 10 may correspond to the node 20 described with reference to FIGS. 1 to 9.

According to some embodiments, the communication device 1010 may communicate with an external device. Specifically, the communication device 1010 may be connected to a network by wire or wirelessly to perform communication with an external device. Here, the external device may include other nodes on the blockchain network. The nodes may include a server of a provider that generates and distributes electronic codes, and servers of each of a plurality of operators so that a service is provided using the electronic codes. Further, the electronic code may be one of a code consisting of a QR code, a barcode, a color code, and a character or symbol, but is not limited thereto.

The communication device 1010 may include a communication module supporting one of various wired and wireless communication methods. The communication module may be a short-range communication module or a wired communication module.

According to some embodiments, the memory 1020 is a flash memory type, a hard disk type, a multimedia card micro type, a card type memory (SD, XD memory, etc.) RAM, Random Access Memory (RAM), Static Random Access Memory (SRAM), Read-Only Memory (ROM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Programmable Read-Only Memory (PROM) magnetic memory, It may include a storage medium of at least one of a magnetic disk and an optical disk. The memory 1020 may store at least one program for executing a method of operating a node 20 on a network of a blockchain that manages by distributing and managing a ledger recording a service usage history using electronic codes. At least one program stored in the memory 1020 may be classified into a plurality of modules according to functions.

According to some embodiments, the processor 1030 controls the overall operation of the node 20, and may include at least one processor such as a CPU. The processor 1030 may include at least one specialized processor corresponding to each function, or may be a processor integrated into one.

According to some embodiments, the processor 1030 may execute a program stored in the memory 1020, read data or a file stored in the memory 1020, or store a new file in the memory 1020. Also, the processor 1030 may execute instructions stored in the memory 1020.

According to some embodiments, the communication device 1010 may receive the first data scheduled to use the first data scanned by the operator's terminal and the service using the first electronic code. The communication device 1010 may transmit the received first data and first scheduled usage details to the processor 1030.

According to some embodiments, the communication device 1010 receives a decryption key of an electronic code used to decrypt initial information contained in the electronic code and encrypted data contained in the electronic code from a server that generates and distributes the electronic code. can do.

According to some embodiments, the processor 1030 may extract the first encrypted data used to record the usage history of the service in the ledger from the first data. The processor 1030 may verify the validity of the first scheduled use history, based on the first history information of the service for the first encrypted data and the first electronic code recorded in the ledger.

According to some embodiments, the processor 1030 may decrypt the first encrypted data using the first decryption key of the first electronic code. The processor 1030 may obtain current information of a service that can be provided by the first electronic code from the decrypted data. The processor 1030 may compare the current information of the service with the first history information for the first electronic code recorded in the ledger, and verify the validity of the first scheduled usage.

Specifically, the processor 1030 may verify whether there is first history information of the first electronic code corresponding to the current information of the service, among the history information recorded in the ledger, and verify the validity of the first electronic code. Here, the first history information of the first electronic code may include initial information included in the first electronic code and history information provided by the first electronic code.

When the first electronic code is valid, the processor 1030 compares the first history information of the first electronic code with the current information of the service, and determines whether the first service corresponding to the first scheduled use is available, and determines The validity of the first scheduled use according to the results can be verified.

According to some embodiments, the processor 1030 may control the communication device 1010 so that the result of verifying the validity of the first scheduled usage details is transmitted to the terminal of the operator. For example, if the first scheduled use schedule is valid, the communication device 1010 may transmit a message to approve the first scheduled use schedule to the operator's terminal. On the other hand, if the first scheduled use schedule is not valid, the communication device 1010 may transmit a message to reject the approval of the first scheduled use schedule to the terminal of the operator.

According to some embodiments, when the first scheduled usage is valid, the communication device 1010 may transmit the first scheduled usage to other nodes on the blockchain network. In addition, the processor 1030 may record the first scheduled use history in a candidate block of the node 20.

According to some embodiments, the communication device 1010 may receive the first usage history of the service according to the first usage schedule from the operator's terminal. The processor 1030 may reflect the first usage history in the first usage schedule recorded in the candidate block. The processor 1030 may perform proof of work for a candidate block reflecting a plurality of usage details for the service, and add the candidate block to the blockchain as a valid block.

According to some embodiments, when a service based on the first electronic code is divided and provided, the processor 1030 may update the first history information based on the first encryption data and the first usage history.

According to some embodiments, the communication device 1010 may receive a first block in which proof of work is completed from a second node on the network of the blockchain. The processor 1030 may verify the validity of the first block by confirming the validity of at least one usage history recorded in the first block and the validity of the block header of the first block. If the first block is valid, the processor 1030 may add the first block to the node 20's blockchain. On the other hand, if the first block is invalid, the processor 1030 may discard the first block and generate a valid block to be added to the node 20's blockchain.

11 is a flowchart illustrating an operation method of a server that generates and distributes electronic code including information used to provide a predetermined service according to an embodiment.

Referring to FIG. 11, in step S1110, the server may generate first data including information used to provide the first service.

In step S1120, the server 10 may generate the first encrypted data by encrypting the first data using the first encryption key assigned to the first data.

In step S1130, the server 10 is the first encryption key allocated to the first encryption data and the first data as at least one node on the network of the blockchain that distributes and manages the ledger recording the usage history of the service using the electronic code. Can send. In addition, the server 10 may transmit the first encryption data and the first decryption key allocated to the first data to each terminal of a plurality of operators.

In step S1140, the server 10 may generate a first electronic code including the first encrypted data. The server 10 may distribute the first electronic code to an external device.

12 is a block diagram showing a configuration of a server that generates and distributes electronic codes including information used to provide a predetermined service according to an embodiment.

The server 10 illustrated in FIG. 12 may include a communication device 1210, a memory 1220, and a processor 1230. However, not all of the illustrated components are essential components. The server 10 may be implemented by more components than the illustrated components, and the server 10 may also be implemented by fewer components. Hereinafter, the components will be described. The node illustrated in FIG. 12 may correspond to the server 10 that generates and distributes the electronic codes described in FIGS. 1 to 9.

According to some embodiments, the communication device 1210 may communicate with an external device. Specifically, the communication device 1210 may be connected to a network by wire or wirelessly to perform communication with an external device. Here, the external device may include nodes on a blockchain network and a terminal of an operator.

The communication device 1210 may include a communication module supporting one of various wired and wireless communication methods. The communication module may be a short-range communication module or a wired communication module.

According to some embodiments, the memory 1220 is a flash memory type, a hard disk type, a multimedia card micro type, a card type memory (SD, XD memory, etc.) RAM, Random Access Memory (RAM), Static Random Access Memory (SRAM), Read-Only Memory (ROM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Programmable Read-Only Memory (PROM) magnetic memory, It may include a storage medium of at least one of a magnetic disk and an optical disk. The memory 1220 may store at least one program for executing a method of operating the server 10 on a computer that generates and distributes electronic code including encrypted data used to provide a service. At least one program stored in the memory 1220 may be classified into a plurality of modules according to functions.

According to some embodiments, the processor 1230 controls the overall operation of the server 10, and may include at least one processor such as a CPU. The processor 1230 may include at least one specialized processor corresponding to each function, or may be a processor integrated into one.

According to some embodiments, the processor 1230 may execute a program stored in the memory 1220, read data or a file stored in the memory 1220, or store a new file in the memory 1220. Also, the processor 1230 may execute instructions stored in the memory 1220.

According to some embodiments, the processor 1230 may generate first data including information used to provide a first service.

The processor 1230 may generate the first encrypted data by encrypting the first data using the first encryption key assigned to the first data.

The processor 1230 communicates such that the first encryption data and the first decryption key allocated to the first data are transmitted to at least one node on the blockchain network that distributes and manages the ledger recording the service usage history using the electronic code. The device 1210 can be controlled. In addition, the processor 1230 may control the communication device 1210 such that the first encryption data and the first decryption key allocated to the first data are transmitted to each terminal of a plurality of operators.

The processor 1230 may generate a first electronic code including the first encrypted data. The processor 1230 may distribute the first electronic code to an external device.

The device described above may be implemented with hardware components, software components, and/or combinations of hardware components and software components. For example, the devices and components described in the embodiments include, for example, processors, controllers, arithmetic logic units (ALUs), digital signal processors (micro signal processors), microcomputers, field programmable gate arrays (FPGAs). , A programmable logic unit (PLU), microprocessor, or any other device capable of executing and responding to instructions, may be implemented using one or more general purpose computers or special purpose computers. The processing device may execute an operating system (OS) and one or more software applications running on the operating system. In addition, the processing device may access, store, manipulate, process, and generate data in response to the execution of the software. For convenience of understanding, a processing device may be described as one being used, but a person having ordinary skill in the art, the processing device may include a plurality of processing elements and/or a plurality of types of processing elements. It can be seen that may include. For example, the processing device may include a plurality of processors or a processor and a controller. In addition, other processing configurations, such as parallel processors, are possible.

The software may include a computer program, code, instruction, or a combination of one or more of these, and configure the processing device to operate as desired, or process independently or collectively You can command the device. Software and/or data may be interpreted by a processing device, or to provide instructions or data to a processing device, of any type of machine, component, physical device, virtual equipment, computer storage medium or device. , Or may be permanently or temporarily embodied in the transmitted signal wave. The software may be distributed over networked computer systems and stored or executed in a distributed manner. Software and data may be stored in one or more computer-readable recording media.

The method according to the embodiment may be implemented in the form of program instructions that can be executed through various computer means and recorded in a computer-readable recording medium. The computer-readable recording medium may include program instructions, data files, data structures, or the like alone or in combination. The program instructions recorded on the medium may be specially designed and configured for the embodiments, or may be known and usable by those skilled in 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, DVDs, and magnetic media such as floptical disks. -Hardware devices specifically configured to store and execute program instructions such as magneto-optical media, and ROM, RAM, flash memory, and the like. Examples of program instructions include high-level language code that can be executed by a computer using an interpreter, etc., as well as machine language codes produced by a compiler. The hardware device described above may be configured to operate as one or more software modules to perform the operations of the embodiments, and vice versa.

As described above, although the embodiments have been described by a limited embodiment and drawings, those skilled in the art can make various modifications and variations from the above description. For example, the described techniques are performed in a different order than the described method, and/or the components of the described system, structure, device, circuit, etc. are combined or combined in a different form from the described method, or other components Alternatively, even if replaced or substituted by equivalents, appropriate results can be achieved.

Therefore, other implementations, other embodiments, and equivalents to the claims are also within the scope of the following claims.

Claims (20)

In the operation method of the first node on the network of the blockchain to distribute and manage the ledger recording the service usage history using the electronic code,
Receiving initial information included in each of the electronic codes of the same type as the electronic code from a server generating and distributing the electronic code, and recording initial information included in each of the electronic codes in the ledger;
Receiving first data scheduled to use the first data of the service using the first electronic code and the first data scanned from the operator's terminal;
Extracting first encrypted data used to record the usage history of the service in the ledger from the first data;
Verifying the validity of the first scheduled usage history based on the first history information of the service for the first encrypted data and the first electronic code recorded in the ledger; And
And transmitting a result of verifying the validity of the first scheduled use schedule to a terminal of the operator,
The step of verifying the validity of the first scheduled use schedule,
Decrypting the first encrypted data to obtain current information of the service that can be provided by the first electronic code;
Extracting the history information of the first electronic code from the blocks constituting the ledger, extracting the first history information for the first updated electronic code from the history information of the first electronic code, Comparing the current information of the service with the first history information, and verifying the validity of the first electronic code-the first history information includes initial information about the first electronic code and the first electronic code. History information provided with service is included; And
If the first electronic code is valid, determining whether a first service corresponding to the first scheduled usage history is available based on current information of the service, and verifying the validity of the first scheduled usage history. How to. According to claim 1,
And receiving a decryption key of each of the electronic codes used to decrypt the encrypted data contained in each of the electronic codes from the server. According to claim 2,
The step of obtaining the current information of the service,
Decrypting the first encrypted data using a first decryption key of the first electronic code, and obtaining current information of the service that can be provided by the first electronic code scanned at the operator's terminal; Included, Method. delete According to claim 1,
The step of transmitting the result of verifying the validity of the first scheduled usage details to the terminal of the operator,
If the first scheduled use schedule is valid, transmitting a message to approve the first scheduled use schedule to the terminal of the operator; And
And if the first scheduled use schedule is not valid, transmitting a message to reject the approval of the first scheduled use schedule to the terminal of the operator. According to claim 1,
And if the first scheduled usage is valid, transmitting the first scheduled usage to another node on the network of the blockchain, and recording the first scheduled usage in a candidate block. The method of claim 6,
Receiving a first usage history of the service according to the first usage schedule from a terminal of the operator;
Reflecting the first usage history in the first usage schedule recorded in the candidate block; And
And performing the proof of work of the candidate block reflecting a plurality of usage details for the service, and adding the candidate block as a valid block to the blockchain. The method of claim 7,
And when the service based on the first electronic code is divided and provided, updating the first history information based on the first encryption data and the first usage history. According to claim 1,
Receiving the first block of the proof of work from the second node on the network of the blockchain, checking the validity of at least one usage history recorded in the first block and the validity of the block header of the first block, Verifying the validity of the first block;
If the first block is valid, adding the first block to the blockchain of the first node; And
And if the first block is invalid, discarding the first block and generating a valid block to be added to the blockchain of the first node. According to claim 1,
Nodes on the network of the blockchain,
And a server of a provider that generates and distributes the electronic code, and a plurality of service providers' servers that enable the service to be provided using the electronic code. According to claim 1,
The electronic code is one of a code consisting of a QR code, a barcode, a color code, and a character or symbol. A computer-readable recording medium recording a program for executing the method of any one of claims 1 to 3, 5 to 11 on a computer. A communication device that communicates with nodes and external devices on a network of a blockchain that distributes and manages a ledger that records a service usage history using an electronic code;
Processor; And
And a memory for storing instructions executable by the processor,
The processor, by executing the instructions,
The initial information included in each of the electronic codes of the same type as the electronic code is received from the server generating and distributing the electronic code through the communication device, and the initial information included in each of the electronic codes is recorded in the ledger. and,
The first data scanned by the operator's terminal and the first scheduled usage of the service using the first electronic code are received through the communication device,
Extracting first encrypted data used to record a usage history of the service using the first electronic code in the ledger from the first data,
Decrypt the first encrypted data to obtain current information of the service that can be provided by the first electronic code,
The history information of the first electronic code is extracted from blocks constituting the ledger, and the first history information of the service for the first updated electronic code is finally extracted from the history information of the first electronic code. And compares the current information of the service with the first history information to verify the validity of the first electronic code, and-the first history information includes initial information about the first electronic code and the first electronic code History information provided by the service is included -,
If the first electronic code is valid, it is determined whether the first service corresponding to the first scheduled use is available based on the current information of the service, and the validity of the first scheduled use is verified,
A node that transmits a result of verifying the validity of the first scheduled usage details to the terminal of the operator through the communication device. The method of claim 13,
The processor, by executing the instructions,
A node for receiving, via the communication device, a decryption key for each of the electronic codes used to decrypt the encrypted data contained in each of the electronic codes from the server. The method of claim 14,
The processor, by executing the instructions,
A node that decrypts the first encrypted data using a first decryption key of the first electronic code, and obtains current information of the service that can be provided by the first electronic code scanned at the operator's terminal . delete The method of claim 13,
The processor, by executing the instructions,
If the first scheduled use schedule is valid, the first scheduled use schedule is transmitted through the communication device to another node on the blockchain network,
A node that records the first scheduled use history in a candidate block. The method of claim 17,
The processor, by executing the instructions,
Receiving the first usage history of the service according to the first usage schedule from the terminal of the operator through the communication device,
The first usage history is reflected in the first usage schedule recorded in the candidate block,
A node that adds the candidate block to the blockchain as a valid block by performing proof of work of the candidate block reflecting a plurality of usage details for the service. The method of claim 18,
The processor, by executing the instructions,
When the service based on the first electronic code is divided and provided, the first history information is updated based on the first encryption data and the first usage history. Communication device;
Processor; And
And a memory for storing instructions executable by the processor,
The processor, by executing the instructions,
Generate first data including information used to provide the first service,
Encrypting the first data using a first encryption key allocated to the first data to generate first encrypted data,
At least one node on a network of a blockchain that distributes and manages a ledger that records the usage history of a service using an electronic code, or a terminal of a plurality of operators to provide the service using the electronic code, wherein the first encryption Transmits data and a first decryption key assigned to the first data through the communication device,
The initial information included in each of the electronic codes of the same type as the electronic code is transmitted to the at least one node through the communication device,
Generating a first electronic code including the first encrypted data, distributing the first electronic code to an external device,
The first node among the at least one node receives information on the first service history of the first service using the first electronic code in the ledger,
The first service, the first history information for the first electronic code and the first encryption for the first electronic code finally updated from the history information of the first electronic code extracted from the blocks constituting the ledger of the first node Based on the result of comparing the information of the first service obtained from the data, it is provided after the validation of the first electronic code is completed,
The first history information includes initial information about the first electronic code and history information provided by the first electronic code.

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