RF card system linked to digital content purchase

Abstract

The present invention relates to a digital content purchase-linked RF card system, more specifically, to a digital content purchase-linked RF card system that includes a digital vending machine, RF card issuance, and mobile linkage functions to allow selective use of online and offline services through the purchase of an RF card medium, and records 1 / N share ownership on an RF card medium or memory using an NFT share management module, thereby enabling users to conveniently purchase or sell services and digital content as NFT shares using an offline and online dual mode operation module.

Description

Technology Field

[0001] The present invention relates to a digital content purchase-linked RF card system, more specifically, to a digital content purchase-linked RF card system that includes a digital vending machine, RF card issuance, and mobile linkage functions to allow selective use of online and offline services through the purchase of an RF card medium, and records 1 / N share ownership on an RF card medium or memory using an NFT share management module, thereby enabling users to conveniently purchase or sell services and digital content as NFT shares using an offline and online dual mode operation module. Background Technology

[0003] Generally, the procedures for online and offline sales and purchases are operated separately. Consumers who purchased offline store content, such as coupons, online were required to possess a QR code or coupon sent via email, social media, or text message to use the service at the store; however, delays or denials of entry frequently occurred during this process due to printing errors, loss, or forgery issues.

[0004] In addition, QR codes and paper coupons are single-use and the linkage between systems is unstable, so payment and usage history are not synchronized, leading to continued consumer dissatisfaction.

[0005] Meanwhile, on the seller's side, since online platforms and offline ticketing systems are established separately, redundant work is incurred as online purchase history, refund and exchange information, and offline usage history must be managed in separate databases. This has increased operational risks, such as delays in refund processing and double-payment errors, while on-site personnel face a heavier workload due to repetitive verification procedures and a decline in the quality of customer service.

[0006] To address these issues, some RF card-based offline usage systems were launched; however, these systems focused primarily on top-up, membership management, and access authentication functions, resulting in insufficient integration with online content purchasing platforms. Consequently, even when purchasing content through digital vending machines, users had to manually input data at a separate card issuing machine or issue additional store-specific cards. This meant consumers had to endure additional waiting times and repetitive procedures, while sellers faced the inefficiency of having to manage card inventory and issuance records separately.

[0007] In addition, consumers could not view their purchase history and remaining usage rights in real time via smartphone apps or web pages, and operators could not provide promotions or personalized notifications via mobile data, leading to increasing user inconvenience. As a result, a vicious cycle persisted in which repeated inquiries from consumers occurred even after online purchases, and overall customer satisfaction remained low.

[0008] In particular, recently, there has been an increasing number of attempts to issue blockchain-based NFTs in digital art exhibitions, unmanned PC cafes, coin karaoke rooms, and study cafes. However, existing systems do not support the issuance and management functions of NFTs, making it impossible for consumers to purchase digital content in the form of NFTs and convert them into offline usage rights or issue them in the form of equity ownership (1 / N). As a result, opportunities for new revenue models are blocked, and it is difficult to attract the attention of the younger generation, the next generation of customers. Furthermore, if real-time synchronization between online and offline services is not achieved, data discrepancies between the time of purchase and the time of use lead to service denial, refund disputes, and difficulties in detecting fraudulent use. This not only reduces operational efficiency and lowers the seller's brand credibility but also causes consumers to feel anxious about recurring payments.

[0009] Therefore, there is a need to develop technology that integrates digital vending machines, RF card issuance and storage technology, and mobile connectivity functions so that digital content purchased online is immediately and automatically issued and authenticated as access passes for specific services in online and offline stores, while also supporting NFT equity ownership management and both online and offline dual modes. Prior art literature

[0011] Patent Document (001) Republic of Korea Registered Patent No. 10-1622364 (Registered on May 12, 2016) The problem to be solved

[0012] The technical problem that the present invention aims to solve is to resolve the aforementioned problems or necessities, and to provide a digital content purchase-linked RF card system that allows consumers to easily purchase digital content and immediately receive an RF card medium automatically through a touch input screen and an amount input section, thereby providing a differentiated service that connects online and offline, by providing users with a touch input screen and an amount input section, and by providing a system that is widely applicable in various industries and environments to effectively manage user usage in unmanned facilities such as unmanned PC rooms, coin karaoke rooms, and study cafes, conveniently supporting the issuance of offline exhibition admission tickets using NFT technology in digital art platforms, and providing offline space usage tickets linked to the purchase of metaverse and game items.

[0013] Another objective of the present invention is to provide a digital content purchase-linked RF card system capable of consistently recognizing RF cards according to standardized specifications and verifying service usage in both online and offline stores through a card recognition unit.

[0014] Another objective of the present invention is to provide a digital content purchase-linked RF card system that can automatically process new registration, inquiry, update, and deletion by mapping card identifier information and member identification information 1:1 through a member management module.

[0015] Another objective of the present invention is to provide a digital content purchase-linked RF card system capable of automatically controlling access to offline facilities by having a card media usage verification module deduct and update the usage start date, usage end date, and usage restriction count in real time.

[0016] Another objective of the present invention is to provide a digital content purchase-linked RF card system capable of real-time payment management by supporting balance verification based on recharge amount information and automatic recharge transaction processing through a recharge management module.

[0017] Another objective of the present invention is to provide a digital content purchase-linked RF card system capable of enhancing security and detecting fraudulent use through encryption key-based mutual authentication and usage history analysis by an authentication module and a log processing module.

[0018] Another objective of the present invention is to provide a digital content purchase-linked RF card system that can enhance user convenience by providing card lookup and transfer functions via QR code, Bluetooth linkage, and a mobile app through a mobile linkage module.

[0019] Another objective of the present invention is to provide a digital content purchase-linked RF card system in which an NFT stake management module utilizes a blockchain smart contract to issue and record 1 / N shares of digital content and supports verification and transfer functions.

[0020] Another objective of the present invention is to provide a digital content purchase-linked RF card system in which a dual-mode operation module detects the network connection status, switches between online and offline modes, and synchronizes offline logs with a central server at the time of network recovery.

[0022] Meanwhile, the technical problems to be solved by the present invention are not limited to those mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art to which the present invention belongs from the description below. means of solving the problem

[0024] A digital content purchase-linked RF card system related to an example of the present invention for realizing the above-described task may first include a user input unit (100) configured to receive selection information (120) displayed on a touch input screen (110).

[0025] Additionally, it may include an amount input unit (200) configured to receive an input amount (220) through an amount input means (210), which is a selected amount (121) included in the selected information (120) input from the user input unit (100).

[0026] In addition, the system may include a card management unit (300) configured to determine whether the selection information (120) and the input amount (220) match, and in the case of settlement, to generate RF card information (230) including input amount information, card number information, and expiration date information, store it in a card management memory (310), and issue an RF card medium (C).

[0027] And, it may include a card recognition unit (400) configured to recognize the RF card medium (C) issued for use in the card management unit (300) through a recognition means (410).

[0028] Here, the RF card information (230) may be characterized by including card identifier information, member identification information entered from the user input unit (100), usage start date, usage end date, usage restriction count information, recharge amount information, encryption key information, and usage restriction flag information.

[0029] At this time, the card management unit (300) further includes a member management module (320) that maps card identifier information and member identification information to register, look up, update, and delete new members; a card media usage verification module (330) that reads the usage start date, usage end date, and usage restriction count information of the RF card medium (C) to determine whether online and offline use is possible, deducts the number of available uses or the remaining amount, and updates; a charging management module (340) that checks the balance and processes charging transactions based on charging amount information; an authentication module (350) that determines mutual authentication and access availability using encryption key information and a usage restriction flag; a log processing module (360) that stores and analyzes card usage history including charging records and usage payments to detect abnormal transactions; and a mobile linkage module (370) that manages QR code and Bluetooth linkage status to look up the RF card medium (C) via a mobile app and provides a transfer function. It can be characterized by being provided.

[0030] Meanwhile, the card management unit (300) is additionally configured to include an NFT share management module (380) to enable a user to purchase NFT-based digital content as shares using the RF card medium (C); the NFT share generation unit (381) is configured to retrieve the total number of issued shares (M) from the smart contract of a digital content NFT already issued on a blockchain network, and to receive the number of share divisions (N) and the number of requested shares (1) specified by the user through the user input unit (100) or the mobile linkage module (370) to calculate the 1 / N share amount; the NFT share recording unit (382) is configured to encrypt the 1 / N share information calculated by the NFT share generation unit (381) according to encryption key information and store it in a dedicated file of the RF card medium (C) or an allocated partitioned memory block; and the NFT contract verification unit (383) is configured to decrypt the encrypted share information stored in the NFT share recording unit (382). After verification, a transaction calling the “mintFraction” or “issueFraction” function of a smart contract is created through a secure API communication channel with a blockchain node to confirm that 1 / N share ownership has been officially issued and registered on the blockchain. When the holder of the RF card medium (C) requests a transfer transaction of part or all of the share through a mobile app or the touch input screen (110) to the NFT share transaction unit (384), the input information is formatted into a transaction for calling the “transferFraction” function of a smart contract and transmitted to the blockchain network, and upon receiving confirmation of whether the transfer is complete, the ownership share data is updated by synchronizing with the RF card medium (C) and the card management unit (300).

[0031] Additionally, the RF card medium (C) is provided as a MIFARE DESFire EV1-based card medium and additionally includes a separate application file system with a capacity of 8 KB, and the NFT share recording unit (382) is configured to store share information encrypted using a 128-bit IV and a 256-bit key in the AES-256-GCM method in units of 64-byte blocks in the application file, and the NFT contract verification unit (383) is provided to create and transmit share issuance and transfer transactions by calling the “mintFraction” and “transferFraction” functions within an ERC-1155 standard smart contract on the Ethereum mainnet, and the NFT share trading unit (384) is provided to require mobile app-based OTP (One-Time Password) second-level authentication upon a share transfer request, and the card recognition unit (400) includes an NFC reader conforming to ISO / IEC 14443 Type A standards, and after performing a firmware integrity verification procedure through a Secure Element upon card reading The above RF card information (230) may be characterized by being configured to transmit to the above card management unit (300).

[0032] In addition, the dual-mode operation module (500) capable of operating in online and offline stores is further included, wherein the dual-mode operation module (500) is configured to detect network status in online mode to verify the validity of RF card information (230) and transmit usage logs through real-time communication with the card management unit (300), and is configured to perform validation of the validity of RF card information (230) using card identifier information, usage ticket information, and authentication key stored in a pre-synchronized local file in offline mode, and the usage logs generated in offline mode are temporarily stored in a local log storage file and transmitted to the card management unit (300) in a batch manner through the synchronization module (510) at the time of network recovery. Effects of the invention

[0034] By using the digital content purchase-linked RF card system of the present invention,

[0035] First, consumers can complete the content selection and payment procedures at the digital vending machine through the touch input screen and the amount insertion section, and at the same time, the card management section automatically issues an RF card medium, allowing for immediate use of the service without any waiting or manual work.

[0036] Second, the card recognition unit consistently reads RF cards in online and offline stores and immediately verifies their validity through a standard-based NFC reader, thereby enabling integrated operation without interruption between sales channels.

[0037] Third, since the member management module automatically maps card identifier information and member identification information to handle new registration, inquiry, update, and deletion, operators can streamline customer management tasks.

[0038] Fourth, the card media usage verification module implements accurate usage control by deducting and updating the usage start date, usage end date, and usage restriction count in real time, thereby preventing excessive usage and effectively blocking unauthorized use of the service in advance.

[0039] Fifth, the charging management module processes balance checks and charging transactions in real time based on charging amount information, enhancing convenience for consumers by allowing them to immediately top up and use the service even when their balance is insufficient, while reducing the risk of payment failure for sellers.

[0040] Sixth, the authentication module and log processing module can enhance security and audit trailability by detecting and blocking abnormal transactions through encryption key-based mutual authentication and usage history analysis, and by securely recording all card usage details.

[0041] Seventh, since the mobile linkage module supports QR code and Bluetooth integration and provides card inquiry and transfer functions through a mobile app, users can check their remaining usage rights and transaction history in real time, anytime and anywhere.

[0042] Eighth, since the NFT equity management module can issue, record, and transfer 1 / N shares of digital content using blockchain smart contracts, the seller has the effect of providing differentiated value-added services.

[0043] Ninth, the dual-mode operation module performs real-time synchronization with the central server in online mode and local database-based verification and temporary log storage in offline mode, thereby effectively ensuring service continuity and data consistency even in environments with network instability.

[0045] Meanwhile, the effects obtainable from the present invention are not limited to those mentioned above, and other unmentioned effects will be clearly understood by those skilled in the art to which the present invention belongs from the description below. Brief explanation of the drawing

[0047] The following drawings attached to this specification illustrate a preferred embodiment of the present invention and serve to further enhance understanding of the technical concept of the present invention together with the detailed description of the invention; therefore, the present invention should not be interpreted as being limited only to the matters described in such drawings. FIG. 1 is a diagram showing the overall configuration of a digital content purchase-linked RF card system according to a preferred embodiment of the present invention. FIG. 2 is a drawing showing a user input section of a digital content purchase-linked RF card system according to a preferred embodiment of the present invention. FIGS. 3 and 4 are drawings showing an amount input section of a digital content purchase-linked RF card system according to a preferred embodiment of the present invention. FIG. 5 is a drawing showing a card recognition unit of a digital content purchase-linked RF card system according to a preferred embodiment of the present invention. FIG. 6 is a drawing showing an example of an RF card medium of a digital content purchase-linked RF card system according to a preferred embodiment of the present invention. FIGS. 7 to 9 are drawings showing a user input section of a digital content purchase-linked RF card system according to a preferred embodiment of the present invention. FIG. 10 is a block diagram showing the overall configuration of a digital content purchase-linked RF card system according to a preferred embodiment of the present invention. FIG. 11 is a block diagram showing selection information of a digital content purchase-linked RF card system according to a preferred embodiment of the present invention. FIG. 12 is a block diagram showing a means for inserting money into a digital content purchase-linked RF card system according to a preferred embodiment of the present invention. FIG. 13 is a block diagram showing RF card information of a digital content purchase-linked RF card system according to a preferred embodiment of the present invention. FIG. 14 is a block diagram showing a card management unit of a digital content purchase-linked RF card system according to a preferred embodiment of the present invention. FIG. 15 is a block diagram showing the card management section of a digital content purchase-linked RF card system in more detail according to a preferred embodiment of the present invention. Specific details for implementing the invention

[0048] Specific structural or functional descriptions of embodiments according to the concept of the present invention disclosed herein are provided merely for the purpose of explaining embodiments according to the concept of the present invention, and embodiments according to the concept of the present invention may be implemented in various forms and are not limited to the embodiments described herein.

[0049] Embodiments according to the concept of the present invention may be subject to various modifications and may take various forms; therefore, embodiments are illustrated in the drawings and described in detail in this specification. However, this is not intended to limit the embodiments according to the concept of the present invention to specific disclosed forms, and includes all modifications, equivalents, or substitutions that fall within the spirit and scope of the present invention.

[0050] FIG. 1 is a diagram showing the overall configuration of a digital content purchase-linked RF card system according to a preferred embodiment of the present invention; FIG. 2 is a diagram showing a user input unit of a digital content purchase-linked RF card system according to a preferred embodiment of the present invention; FIG. 3 and 4 are diagrams showing an amount input unit of a digital content purchase-linked RF card system according to a preferred embodiment of the present invention; FIG. 5 is a diagram showing a card recognition unit of a digital content purchase-linked RF card system according to a preferred embodiment of the present invention; FIG. 6 is a diagram showing an example of an RF card medium of a digital content purchase-linked RF card system according to a preferred embodiment of the present invention; FIG. 7 to 9 are diagrams showing a user input unit of a digital content purchase-linked RF card system according to a preferred embodiment of the present invention; FIG. 10 is a block diagram showing the overall configuration of a digital content purchase-linked RF card system according to a preferred embodiment of the present invention; FIG. 11 is a block diagram showing selection information of a digital content purchase-linked RF card system according to a preferred embodiment of the present invention; and FIG. 12 is a diagram showing an amount input means of a digital content purchase-linked RF card system according to a preferred embodiment of the present invention. FIG. 13 is a block diagram showing RF card information of a digital content purchase-linked RF card system according to a preferred embodiment of the present invention, FIG. 14 is a block diagram showing a card management unit of a digital content purchase-linked RF card system according to a preferred embodiment of the present invention, and FIG. 15 is a block diagram showing the card management unit of a digital content purchase-linked RF card system according to a preferred embodiment of the present invention in more detail.

[0052] According to one embodiment of the present invention, the digital content purchase-linked RF card system links digital content purchase with an RF card to simultaneously provide and effectively manage content purchase and the use of online and offline services. First, the user selects a desired content among various digital content through a touch input screen (110) and determines whether the amount (220) matches. Once settlement is complete, detailed RF card information (230), including input amount information, card number information, and expiration date information, is generated and safely stored in a card management memory (310). Subsequently, the user is configured to easily start using online and offline services by tagging the issued RF card medium (C) to a card recognition unit (400) configured in the form of an NFC reader.

[0053] Meanwhile, in one embodiment of the present invention, the card management unit (300) is configured with a member management module (320) that performs member management functions, such as new member registration, inquiry, renewal, and deletion, by mapping card identifier information and member identification information to increase user convenience and system efficiency. Additionally, it is configured to manage information on the start date of use, end date of use, and number of usage restrictions of the issued RF card medium (C) to accurately determine whether it is usable in real time in online and offline environments, and is configured with a card medium usage verification module (330) that deducts and updates the number of uses or remaining amount each time it is used. Furthermore, for user convenience, the charging management module (340) is configured to provide a function to check the card balance or easily add additional charges.

[0054] At this time, the card management unit (300) may additionally include a printing function including graphics and be configured to print promotional text or patterns on the RF card medium (C).

[0055] In addition, the card management unit (300) is configured with an authentication module (350) that determines whether mutual authentication and access rights exist using encryption key information and a usage restriction flag to maintain the security of the RF card medium (C), and is configured to enhance the safety of user transactions with a log processing module (360) capable of detecting signs of abnormal transactions and responding by analyzing the user's charging records and payment history.

[0056] Meanwhile, a mobile linkage module (370) is configured to provide a smartphone mobile environment linkage, and the user can view RF card-related information in real time on the mobile app, check and manage the card status, and even perform transfer transaction functions if necessary. By utilizing QR code and Bluetooth technology, the linkage between the mobile app and the RF card is implemented to enhance user convenience.

[0057] Additionally, in order for the user to efficiently divide and manage ownership of digital content based on an NFT smart contract on a blockchain network through the NFT share management module (380), the NFT share generation unit (381) receives the number of share divisions (N) directly specified by the user and the number of shares requested (1) to calculate the share amount of 1 / N, and subsequently, the NFT share recording unit (382) is configured to safely store the calculated share information in a dedicated memory area of ​​the RF card while protected by an encryption key. Here, the NFT contract verification unit (383) verifies the share token issuance and registration procedure through API linkage with a blockchain node, and the NFT share trading unit (384) is configured to maintain the stability of the share transfer transaction through mobile app-based OTP 2-step authentication when the user requests a share transfer transaction.

[0058] Meanwhile, a dual-mode operation module (500) is configured to allow the use of online and offline services, so that it can be used in both online and offline environments. In online mode, the network status is checked in real time to verify the validity of RF card information (230) and transmit usage logs through communication with the card management unit (300), and in offline mode, the validity of RF card information is verified independently based on a pre-synchronized local data file, and usage history generated offline is safely transmitted to the card management unit (300) through the synchronization module (510) to ensure data consistency.

[0059] The system of the present invention described above can be widely applied in various industries and environments. In particular, it can effectively manage user usage in unmanned facilities such as unmanned PC cafes, coin karaoke rooms, and study cafes, and can conveniently support the issuance of offline exhibition admission tickets using NFT technology in digital art platforms. Furthermore, by providing access to offline spaces in conjunction with the purchase of metaverse and game items, it can provide users with a differentiated service that connects the online and offline worlds.

[0061] The present invention has been described above through a preferred embodiment. However, the above-described embodiment is merely an illustrative explanation of the technical concept of the present invention, and it will be understood by those skilled in the art that various changes are possible within the scope of the technical concept of the present invention. Accordingly, the scope of protection of the present invention should be interpreted by the matters described in the patent claims rather than by specific embodiments, and all technical concepts within the same or similar scope should also be interpreted as being included within the scope of rights of the present invention. Explanation of the symbols

[0063] 100 … User input section 110 … Touch input screen 120 … Selection Information 121 … Selected amount 200 … Amount Input Section 210 … Means of monetary input 220 … Input amount 230 … RF Card Information 300 … Card Management Department 310 … Card Management Memory 320 … Member Management Module 330 … Card Media Usage Verification Module 340 … Charging management module 350 … Authentication Module 360 … Log processing module 370 … Mobile Linkage Module 380 … NFT Equity Management Module 381 … NFT Share Creation Section 382 … NFT Share Record Book 383 … NFT Contract Verification Department 384 … NFT Equity Transaction Department 400 … Card recognition unit 410 … means of recognition 500 … Dual Mode Operation Module 510 … Synchronization module

Claims

Claim 1 A user input unit (100) configured to receive selection information (120) displayed on a touch input screen (110); an amount input unit (200) configured to receive an input amount (220) through an amount input means (210) containing a selection amount (121) included in the selection information (120) input from the user input unit (100); and a card management unit (300) configured to determine whether the selection information (120) and the input amount (220) match, and in the case of settlement, to generate RF card information (230) including input amount information, card number information, and expiration date information, store it in a card management memory (310), and issue an RF card medium (C). The system includes a card recognition unit (400) configured to recognize the RF card medium (C) issued for use in the card management unit (300) through a recognition means (410); wherein the RF card information (230) includes card identifier information, member identification information input from the user input unit (100), usage start date, usage end date, usage restriction count information, recharge amount information, encryption key information, and usage restriction flag information; the card management unit (300) further includes a member management module (320) that maps the card identifier information and the member identification information to register, search, update, and delete new members; the system further includes a card medium usage verification module (330) that searches the usage start date, usage end date, and usage restriction count information of the RF card medium (C) to determine whether online and offline use is possible, deducts the number of available uses or the remaining amount, and updates; and processes balance verification and recharge transactions based on the recharge amount information. A charging management module (340) is further included, an authentication module (350) that determines whether mutual authentication and access are possible using encryption key information and a usage restriction flag is further included, a log processing module (360) that detects abnormal transactions by storing and analyzing card usage history including charging records and usage payments is further included, and a mobile linkage module (370) that manages QR code and Bluetooth linkage status to look up the RF card medium (C) through a mobile app and provides a transfer function is further included, and the card management unit (300) isAn NFT share management module (380) is additionally included to enable a user to purchase NFT-based digital content as shares using the RF card medium (C); an NFT share generation unit (381) is configured to retrieve the total number of issued shares (M) from the smart contract of a digital content NFT already issued on a blockchain network, and to receive the number of share divisions (N) and the number of requested shares (1) specified by the user through the user input unit (100) or the mobile linkage module (370) to calculate the 1 / N share amount; an NFT share recording unit (382) is configured to encrypt the 1 / N share information calculated by the NFT share generation unit (381) according to encryption key information and store it in a dedicated file of the RF card medium (C) or an allocated partitioned memory block; and an NFT contract verification unit (383) is configured to decrypt and verify the encrypted share information stored in the NFT share recording unit (382) and then through a secure API communication channel with a blockchain node It is configured to issue a new fractional share token (1 / N share) within the smart contract and to record the fractional share tokens, divided according to the total number of shares based on the original NFT token, in the internal accounting of the smart contract to confirm that the ownership of the 1 / N share has been formally issued and registered on the blockchain; and when the holder of the RF card medium (C) requests a transfer transaction of part or all of the share through a mobile app or the touch input screen (110) via the NFT share transaction unit (384), it generates a transaction to transfer part or all of the share tokens of the caller who entered the input information to another RF card holder, records the change of ownership on the blockchain, receives confirmation of whether the transfer is completed, and synchronizes the ownership share data with the RF card medium (C) and the card management unit (300); and the RF card medium (C) additionally includes a separate application file system with a capacity of 8 KB, and is configured so that the NFT share record unit (382) stores share information encrypted using an encryption key in block units in the application file.The above NFT contract verification unit (383) is configured to generate and transmit stake issuance and transfer transactions by calling a issuance or transfer function within an ERC-1155 standard smart contract on the Ethereum mainnet, and the above NFT stake trading unit (384) is configured to require mobile app-based OTP (One-Time Password) second-level authentication upon request for stake transfer, and the above card recognition unit (400) is configured to be an NFC reader to perform a firmware integrity verification procedure upon card reading and then transmit the above RF card information (230) to the above card management unit (300), and further includes a dual-mode operation module (500) capable of operating in online and offline stores, and the above dual-mode operation module (500) is configured to detect network status in online mode so that the above card management unit (300) verifies the validity of the above RF card information (230) and transmits usage logs through real-time communication, and in offline mode, using card identifier information, usage ticket information, and authentication key stored in a pre-synchronized local file, the A digital content purchase-linked RF card system, characterized by being configured to perform validation of RF card information (230), temporarily storing usage logs generated in offline mode in a local log storage file, and transmitting them in a batch manner to the card management unit (300) via a synchronization module (510) at the time of network recovery. Claim 2 delete Claim 3 delete Claim 4 delete Claim 5 delete

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