High-efficiency compliance tax refund method and system for cross-border e-commerce

Abstract

The invention relates to the technical field of e-commerce tax refund, and particularly discloses a cross-border e-commerce high-efficiency compliance tax refund method and system, and the system comprises a data collection module, a block chain evidence storage module, an intelligent declaration module, a dynamic accounting module, a risk management and control module, a data security module, and a cross-border e-commerce adaptation module. Multi-source data can be collected in real time through the data collection module and preprocessed, compliance messages are automatically generated in cooperation with the intelligent declaration module, declaration is triggered through one key, the tax refund period is greatly shortened, and the automatic declaration effect that tax refund can be carried out after leaving the scene is achieved; furthermore, the data can be encrypted and a hash value can be generated through an alliance chain and fragment storage technology adopted by the block chain evidence storage module, the data cannot be tampered due to upper chain storage, and an operation log can be reversely traced in cooperation with an auditing traceability unit, so that the security and traceability of the data can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of e-commerce tax refunds, and in particular to a high-efficiency and compliant tax refund method and system for cross-border e-commerce. Background Art

[0002] In the field of cross-border e-commerce, the tax refund process has many efficiency and compliance issues. For example, in the traditional tax refund process, e-commerce platform transaction data, enterprise ERP procurement data, customs declaration data and tax system data are scattered and in non-uniform formats. Data collection and pre-processing are inefficient, making it difficult to achieve real-time interaction and standardized processing.

[0003] Secondly, tax refund declarations rely on manual filling, which is prone to errors and the process is cumbersome, resulting in a long tax refund cycle.

[0004] Furthermore, overseas warehouse sales data cannot be synchronized in real time, tax refund calculations are delayed, and there is a lack of a dynamic adjustment mechanism, making it difficult to accurately reflect actual tax refunds. In terms of risk management, the lack of real-time early warning and interception mechanisms makes it impossible to effectively prevent risks such as data discrepancies and abnormal transactions. Post-audit tracing is also difficult to conduct efficiently because data is not stored on the blockchain.

[0005] Therefore, in order to improve the efficiency of tax refund and save time, a highly efficient and compliant tax refund method and system for cross-border e-commerce is proposed. Summary of the Invention

[0006] The purpose of the present invention is to provide a cross-border e-commerce tax refund method and system with high efficiency and compliance, so as to solve the problems raised in the above background technology.

[0007] To achieve the above objectives, the present invention provides the following technical solutions: a highly efficient and compliant tax refund system for cross-border e-commerce, comprising a data collection module, a blockchain evidence storage module, an intelligent declaration module, a dynamic accounting module, a risk management module, a data security module, and a cross-border e-commerce adaptation module; The data collection module is used to collect cross-border e-commerce transaction data in real time and pre-process the collected data; The blockchain evidence storage module adopts alliance chain + shard storage technology to save data; The intelligent declaration module is used to automatically generate compliance declaration messages; The dynamic accounting module adjusts the tax refund amount in real time based on overseas warehouse sales data; The risk control module is used to set a data difference value and issue a risk warning for data exceeding the data difference value; The data security module adopts advanced encryption algorithm to encrypt the data in the system for storage and transmission; The cross-border e-commerce adaptation module automatically adjusts the tax refund process and parameters according to the tax policies of different countries and regions to adapt to the tax refund needs of different markets.

[0008] Preferably, the data acquisition module includes a multi-source system docking unit and a data formatting processing unit; The multi-source system docking unit is used to establish a two-way connection with the e-commerce platform, enterprise ERP, customs system, and tax system through a technical interface to achieve real-time interactive collection of multiple data such as orders, logistics, customs declarations, and taxes; The data formatting processing unit uses ETL technology to perform standardized conversion on data from different systems.

[0009] Preferably, the blockchain evidence storage module includes a hash value generation unit, a consortium chain node management unit, a shard storage management unit and a smart contract execution unit; The hash value generation unit is used to encrypt and calculate multiple data such as the cross-border e-commerce order number, SKU, and customs declaration number to generate a unique hash value; The alliance chain node management unit is used to coordinate the node permissions and responsibilities of customs, tax departments, and certification companies.

[0010] Preferably, the shard storage management unit uses HS code or enterprise ID as the sharding basis, and realizes cross-shard data interaction through the relay chain; The smart contract execution unit is used to set pre-trigger conditions, automatically call the smart contract to complete the hash value on-chain evidence storage, and synchronously issue the hash value submission time, and freeze the account in the event of repeated submission or abnormal permissions.

[0011] Preferably, the intelligent declaration module includes a data acquisition unit, a message generation unit and a one-key trigger declaration unit; The data acquisition unit is used to obtain the purchase data in the enterprise ERP and the sales data of the e-commerce platform in real time through the API interface, and integrate the data to form a basic data set for declaration; The message generation unit automatically generates compliant declaration documents according to the regulations of the customs "single window" and the tax "electronic tax bureau"; The one-key trigger declaration unit starts the pre-tax refund declaration process through the "one-key" button on the system page, and the data is directly connected to the tax system.

[0012] Preferably, the dynamic accounting module includes an overseas warehouse data synchronization unit, a tax refund amount calculation unit and a difference adjustment declaration unit; The overseas warehouse data synchronization unit synchronizes overseas warehouse sales data, inventory changes, return records and other data information in real time through RESTAPI and MQ message queue interfaces. In addition, TLS1.3 encryption and SM4 algorithm are used to protect sensitive fields during the data synchronization process. The tax refund calculation unit is used to calculate the actual tax refund amount based on the purchase price excluding tax, combined with multiple quantities that do not meet the tax refund conditions, according to the first-in-first-out method, and automatically identify data differences.

[0013] Preferably, the difference adjustment declaration unit is used to automatically generate an adjustment declaration form based on the accounting results, automatically push it to the tax system, and synchronously update the tax refund status.

[0014] Preferably, the risk control unit includes an early warning rule setting unit, a process interception execution unit and an audit tracing management unit; The warning rule setting unit is used to preset risk thresholds and automatically push audit notifications when triggered; The process interception execution unit is used to automatically freeze the tax refund process for orders that have not completed sales accounting before the deadline, preventing abnormal transactions from entering the tax refund process; The audit tracing management unit is used to store all operation logs on the chain, and supports cash back tracing through multiple information such as blockchain height and timestamp.

[0015] Preferably, the data security module adopts advanced encryption algorithms to encrypt and store all sensitive data, and the data security module also has a data access permission control function. The data security module also has a data backup and recovery function, and can regularly back up key data; The cross-border e-commerce adaptation module is used to adapt tax policies between different countries and regions, and automatically convert tax rates, currency units and tax declaration formats.

[0016] A highly efficient and compliant tax refund method for cross-border e-commerce, the tax refund method is as follows: Step 1: Connect with multiple source systems through the data collection module to collect various transaction data in real time and perform standardized conversion on the data; Step 2: Generate a hash value using the blockchain evidence storage module, and store it on the blockchain after being managed by the alliance chain node and stored in shards; Step 3: Integrate data through the intelligent reporting module, generate compliance reports and submit reports with one click; Step 4: Use the dynamic accounting module to synchronize overseas warehouse data, calculate the tax refund amount difference and push the adjustment table; Step 5: Use the risk management module to set threshold warnings, intercept abnormal processes, and conduct audit tracing; Step 6: Encrypt data through the data security module and adapt to the tax policies of different countries through the cross-border e-commerce adaptation module.

[0017] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention can collect multi-source data in real time and pre-process it through the data acquisition module, and automatically generate compliance messages in conjunction with the intelligent declaration module, and trigger declaration with one click, significantly shortening the tax refund cycle and achieving the automated declaration effect of "tax refund upon departure". Furthermore, the alliance chain + sharding storage technology adopted by the blockchain evidence storage module can encrypt data and generate hash values, and store them on the chain to ensure that the data will not be tampered with. Moreover, in conjunction with the audit tracing unit, the operation log can be reversely traced to improve the security and traceability of the data.

[0018] 2. The present invention synchronizes overseas warehouse sales data in real time through a dynamic accounting module. In addition, it can calculate the actual tax refund amount according to the first-in-first-out method by combining multiple factors such as non-returnable goods and gifts, and automatically generate an adjustment declaration form to achieve dynamic and accurate adjustment of the tax refund amount. Under the action of the risk management module, by setting difference thresholds, risk warnings can be achieved, forming a full-process risk prevention and control system to reduce tax refund risks.

[0019] 3. This invention ensures the security of data storage and transmission through the advanced encryption algorithm in the data security module, preventing data leakage. Furthermore, the cross-border e-commerce adaptation module can automatically adjust the tax refund process and parameters according to the tax policies of different countries and regions, ensuring system compliance, simplifying the process, and reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 It is a system structure diagram of the present invention; Figure 2 This is a diagram of the data acquisition module architecture of the present invention; Figure 3 This is the architecture diagram of the blockchain evidence storage module of the present invention; Figure 4 This is the smart contract logic diagram of the present invention; Figure 5 This is the architecture diagram of the intelligent declaration module of the present invention; Figure 6 This is a diagram of the dynamic accounting module architecture of the present invention; Figure 7 This is the risk management module architecture diagram of the present invention. DETAILED DESCRIPTION

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] See also Figures 1 to 7 , the present invention provides a technical solution: For example 1, please refer to Figure 1 As shown, a cross-border e-commerce high-efficiency and compliant tax refund method and system includes a data collection module, a blockchain evidence storage module, an intelligent declaration module, a dynamic accounting module, a risk control module, a data security module and a cross-border e-commerce adaptation module; The data collection module is used to collect cross-border e-commerce transaction data in real time and pre-process the collected data. Among them, e-commerce platform data is polled every 5 minutes, customs declaration form status changes are synchronized within 1 minute, and tax refund rate updates are pushed in real time. The throughput: supports an average daily processing of more than 100,000 orders, and the data pre-processing delay is ≤30 seconds.

[0024] The blockchain evidence storage module uses alliance chain + shard storage technology to save data; Among them, the alliance chain is a multi-center blockchain composed of customs, tax departments, and certification companies. It adopts the PBFT consensus algorithm, with a block generation time of 10 minutes and a single-chain TPS ≥ 2000; Sharded storage is divided into logical shards according to HS codes (such as 8501-8543) or corporate IDs. Each shard is configured with 3 consensus nodes, and cross-shard transactions are verified through the relay chain. The intelligent declaration module is used to automatically generate compliance declaration messages; The dynamic accounting module adjusts the tax refund amount in real time based on overseas warehouse sales data; The risk control module is used to set data variance values ​​and issue risk warnings for data that exceeds the variance value. The data security module uses advanced encryption algorithms to encrypt the storage and transmission of data in the system; The cross-border e-commerce adaptation module automatically adjusts the tax refund process and parameters according to the tax policies of different countries and regions to adapt to the tax refund needs of different markets.

[0025] Through the data acquisition module, the system can collect and pre-process multi-source data in real time. Combined with the intelligent declaration module, it automatically generates compliance messages and triggers declarations with a single click, significantly shortening the tax refund cycle and achieving automated declaration of "tax refund upon departure." Furthermore, the blockchain evidence storage module, utilizing consortium chain and sharded storage technology, encrypts data and generates hash values ​​for on-chain storage, ensuring data is tamper-proof. Furthermore, combined with the audit and tracing unit, operation logs can be reversed, further enhancing data security and traceability.

[0026] For example 2, please refer to Figures 2 to 4 As shown, the data acquisition module includes a multi-source system docking unit and a data formatting processing unit; The multi-source system docking unit is used to establish a two-way connection with the e-commerce platform, enterprise ERP, customs system, and tax system through a technical interface, realizing real-time interactive collection of multiple data such as orders, logistics, customs declaration, and taxation; The data formatting processing unit uses ETL technology to perform standardized conversion on data from different systems. The ETL technology is used to first extract heterogeneous data from multiple sources, then convert it according to preset rules, and finally load and output structured data in a unified format to achieve standardized conversion.

[0027] The blockchain evidence storage module includes a hash value generation unit, a consortium chain node management unit, a shard storage management unit, and a smart contract execution unit; The hash value generation unit is used to encrypt and calculate multiple data such as cross-border e-commerce order number, SKU, and customs declaration number to generate a unique hash value; Hash value generation formula: ; in, is the hash value, is the order number, is the inventory unit of the product, The customs declaration number, is the timestamp, It is the string concatenation symbol; This formula can be used to quickly and accurately calculate a unique hash value, ensuring the uniqueness and traceability of each cross-border e-commerce order. The hash value not only contains key information such as the order number, SKU, and customs declaration number, but also incorporates a timestamp, effectively preventing data tampering and duplicate declarations, greatly improving the efficiency and accuracy of cross-border e-commerce tax refunds.

[0028] The alliance chain node management unit is used to coordinate the node permissions and responsibilities of customs, tax departments, and certification companies.

[0029] The specific responsibilities of the customs node are to verify the digital signature of the customs declaration, package the original data blocks, and maintain the HS code sharding rules. It can force the synchronization of all sharded data and use the national government cloud dedicated server and the national secret SM2 encryption module; the responsibilities of the tax node include reviewing the compliance of tax refund rules, issuing tax refund certificates, monitoring abnormal transactions, monitoring cross-shard transactions, and having global view query permissions; the enterprise node needs to submit encrypted sales data, participate in the PBFT consensus of the shard where it is located, store local shard data, and can only access authorized shards. Private data is encrypted and stored through Keycloak key management.

[0030] The shard storage management unit uses HS code or enterprise ID as the basis for sharding, and realizes cross-shard data interaction through the relay chain; Cross-shard data interaction verification formula: ; in, To verify the results, For shard A data, For shard B data, The data for shard C; The sharding by HS code is as follows: Shard 1 covers electronic products 8501-8543, with 3 nodes; Shard 2 includes mechanical products 8544-8999, with 3 nodes; Shard 3 involves instrument products 9000-9999, with 3 nodes. Cross-shard communication is completed through the relay chain. The process is that after the client initiates the cross-shard transaction Tx1, Shard 1 locks the relevant assets, the relay chain verifies the validity of Tx1, and Shard 2 performs pre-submission confirmation. After the submission confirmation is completed, the transaction receipt is returned to the client. This formula can efficiently verify cross-shard data interactions to ensure data integrity and accuracy. During the cross-border e-commerce tax refund process, the verification formula can detect in real time whether data transmission between different shards is consistent, effectively preventing data tampering or loss, thereby improving the efficiency and security of tax refund processing. At the same time, the formula is also highly flexible and scalable, and can adapt to cross-border e-commerce tax refund scenarios of different scales and complexities.

[0031] The smart contract execution unit is used to set pre-trigger conditions, automatically call the smart contract to complete the hash value on-chain evidence storage, and synchronously issue the hash value submission time, and freeze the account in the case of repeated submission or abnormal permissions.

[0032] The smart contract execution unit is used to set pre-trigger conditions, automatically call the smart contract to complete the hash value on-chain storage, and synchronously issue the hash value submission time, and freeze the account in the case of repeated submission or abnormal permissions.

[0033] The smart contract's exception handling logic is as follows: When a hash conflict occurs, the associated account is frozen and requires manual review before being unfrozen. If the signature timeout exceeds 300 seconds, the transaction is discarded and can be resubmitted. If the signature verification fails, a security log is recorded, and the transaction can be retried after key rotation. The smart contract interacts with the customs declaration system by synchronously obtaining the declaration status after connecting to the customs international trade single window. When the declaration status changes to "released," the hash on-chain event monitoring mechanism is automatically triggered.

[0034] For example three, please refer to Figures 5 to 7 As shown, the intelligent declaration module includes a data acquisition unit, a message generation unit and a one-key trigger declaration unit; The data acquisition unit is used to obtain the procurement data in the enterprise ERP and the sales data of the e-commerce platform in real time through the API interface, and integrate the data to form the basic data set for declaration; The message generation unit automatically generates compliant declaration documents based on the regulations of the customs "single window" and the tax "electronic tax bureau"; One-click triggering declaration unit starts the pre-tax refund declaration process through the "one-click" button on the system page, and the data is directly connected to the tax system.

[0035] Among them, the pre-tax refund declaration can be completed within 24 hours after clicking "one click".

[0036] The dynamic accounting module includes the overseas warehouse data synchronization unit, the tax refund calculation unit, and the difference adjustment declaration unit; The dynamic accounting module synchronizes overseas warehouse sales data in real time and, taking into account multiple factors such as non-returnable items and gifts, accurately calculates the actual tax refund amount using the first-in, first-out method. The system automatically generates adjustment declaration forms, enabling dynamic and precise adjustments to tax refund amounts. Furthermore, the risk management module effectively implements risk warnings by setting variance thresholds, building a full-process risk prevention and control system to reduce tax refund risks.

[0037] The overseas warehouse data synchronization unit synchronizes overseas warehouse sales data, inventory changes, return records and other data information in real time through REST API and MQ message queue interface. In addition, TLS1.3 encryption and SM4 algorithm are used to protect sensitive fields during the data synchronization process. TLS1.3 encryption and the SM4 algorithm are used during data transmission and storage. TLS1.3 encryption ensures data confidentiality and integrity, effectively preventing data theft or tampering during transmission. The SM4 algorithm, as a symmetric encryption algorithm, plays a key role in protecting sensitive fields with its efficiency and security. The combined use of these two algorithms significantly enhances system data security and provides a solid technical foundation for compliant tax refunds for cross-border e-commerce.

[0038] Secondly, sensitive fields include the company's financial information, commodity transaction information, and customer information. To ensure the security of this information, the system pays special attention to the control of data access rights during design. Only authorized personnel can access the corresponding data. At the same time, the system also has a complete logging function that can record every data access and operation in detail to facilitate subsequent security audits and tracing.

[0039] The tax refund calculation unit is used to calculate the actual tax refund amount based on the purchase price excluding tax, combined with multiple quantities that do not meet the tax refund conditions, using the first-in, first-out method, and automatically identify data differences.

[0040] The purchase price excluding tax adopts the first-in-first-out method and is consumed in the order of purchase time. The current inventory corresponds to the unit price of the earliest batch. The quantity that does not meet the tax refund includes unsaleable returns, gifts, infringing goods, lost items, etc. The judgment conditions, evidence requirements and processing procedures for unsaleable returns are as follows: If the goods have been unpacked or damaged, the warehouse needs to upload high-definition photos and the quality inspection system needs to generate a report code. The processing procedure is to move them to the "unsaleable inventory" warehouse location to trigger a purchase application; if the goods are expired, a photo of the outer packaging date and the system automatically calculates the shelf life must be provided. The goods are destroyed and a scrap order is recorded. The customer returns the goods subjectively, but it affects the secondary Sales must have a record of the reason for return and customer service review opinions, and the product will be downgraded after repackaging. The criteria for determining lost items, evidence requirements, and processing time limits are as follows: if the logistics track has not been updated within 7 days and the last record is "sent from the transit station", a non-receipt certificate issued by the logistics company and a screenshot of the track automatically captured by the system are required, and the processing time limit is within 30 days; if the receipt record does not match the order address, a photo of the receipt and a statement from the customer that the goods have not been received are required, and the processing time limit is within 15 days; if the package weight differs from the shipping record by >10%, the logistics company's weighing record and the warehouse's outbound weighing record are required, and the processing time limit is within 7 days.

[0041] The difference adjustment declaration unit is used to automatically generate an adjustment declaration form based on the accounting results, automatically push it to the tax system, and synchronously update the tax refund status.

[0042] Calculation formula for tax refund amount for difference adjustment declaration unit: ; in, The difference in tax refund amount, For pre-refund, The actual tax refund amount.

[0043] Through the above formula, the system can accurately calculate the difference in tax refund amounts and automatically make necessary adjustments, reducing the error rate of manual operations and improving the efficiency of tax refund processing. Enterprises no longer need to worry about tedious tax refund calculations and adjustments.

[0044] The risk control unit includes the early warning rule setting unit, the process interception execution unit and the audit tracing management unit; The early warning rule setting unit is used to preset risk thresholds, and automatically push audit notifications when triggered; the set thresholds include logistics loss, collection discrepancies, and triggering an audit when the difference between the total collection amount and the customs declaration amount exceeds ±5%.

[0045] The process interception execution unit is used to automatically freeze the tax refund process for orders that have not completed sales accounting before the deadline, preventing abnormal transactions from entering the tax refund process; The audit and tracing management unit is used to store all operation logs on the chain, and supports cash back tracing through multiple information such as blockchain height and timestamp.

[0046] The data security module uses advanced encryption algorithms to encrypt and store all sensitive data. The data security module also has data access permission control functions. The data security module also has data backup and recovery functions, and can regularly back up key data. Among them, its sensitive data includes corporate bank account information, customer identity information, customer information such as name, ID number, passport number, as well as the core data of order transactions, such as commodity purchase price, actual tax refund amount, cross-border payment amount, customs declaration number and corresponding commodity HS code, and many key information involving corporate trade secrets and tax compliance.

[0047] Data security module encryption formula: ; in, is the ciphertext, For 128 plaintext, For 128 keys, For encryption mode; This formula can be used to efficiently and securely encrypt sensitive data, ensuring the confidentiality and integrity of data during transmission and storage. The 128-bit key used in this encryption formula provides strong encryption strength, making it extremely difficult to crack data and further enhancing data security. At the same time, the data security module also combines data access permission control functions, so that only authorized users can access specific data, thereby effectively preventing data leakage and illegal access.

[0048] The data security module complies with the interface specifications of the "Golden Tax Phase III" as follows: The data format must be XML, compliant with the Electronic Invoice Data Specification 1.0. Required fields include invoice code / number, purchaser tax number, and product code. The encryption method uses TLS1.2+ at the transport layer, and SM4 at the application layer to encrypt sensitive fields. It must also comply with the testing indicators of the Customs AEO Advanced Certification System: In terms of physical security, the data center must comply with the GB / T22239-2019 Security Level 3 physical environment requirements, and cross-border data transmission must be encrypted. Access control uses four-layer permission isolation, which includes functional permissions, data permissions, field permissions, and operation logs. Furthermore, dynamic token two-factor authentication is required, and audit traceability requires that operation logs be retained for ≥6 months to document key operations. In terms of data integrity, the matching rate between customs declarations and orders / logistics orders must be ≥99.5%, with discrepancies automatically triggering risk control. Process compliance meets AEO certification requirements: In terms of document matching, the customs declaration form, order form, logistics form, and payment form must be "consistent". The system achieves this by establishing an association rule engine and following the logic of order ID → logistics waybill number → customs declaration number → payment serial number; price rationality requires that the difference between the declared price and the price of similar goods in the same period is ≤15%. The system uses a price monitoring model to compare the weighted average price of the HS code in the past 30 days in real time; inventory traceability requires that overseas warehouse inventory change records be retained for ≥3 years. The system uses blockchain to record each entry and exit, including block height, operation time, operator, and inventory snapshot.

[0049] The cross-border e-commerce adaptation module is used to adapt tax policies between different countries and regions, and automatically convert tax rates, currency units and tax declaration formats.

[0050] Among them, the cross-border e-commerce adaptation module can intelligently identify product information, transaction information and user information, and automatically match the corresponding tax policies and regulations based on this information. The system has built-in tax databases of many countries and regions around the world to ensure the accuracy and timeliness of the data. When a transaction occurs, the cross-border e-commerce adaptation module can quickly calculate the amount of tax payable, and automatically convert the tax rate and currency unit to generate a declaration format that meets local tax requirements. The cross-border e-commerce adaptation module also supports manual adjustment functions to meet the needs of special transactions or policy changes, ensuring the flexibility and compliance of the tax refund process.

[0051] The advanced encryption algorithm in the data security module ensures the security of data storage and transmission, effectively preventing data leakage; subsequently, with the help of the cross-border e-commerce adaptation module, the system can automatically adjust the tax refund process and parameters according to the tax policies of different countries and regions, which not only ensures the compliance of the system, but also simplifies the operating process and greatly reduces costs.

[0052] For example 4, please refer to Figures 1 to 7As shown, a highly efficient and compliant tax refund method for cross-border e-commerce is as follows: Step 1: Connect with multiple source systems through the data collection module to collect various transaction data in real time and perform standardized conversion on the data; Step 2: Generate a hash value using the blockchain evidence storage module, and store it on the blockchain after being managed by the alliance chain node and stored in shards; Step 3: Integrate data through the intelligent reporting module, generate compliance reports and submit reports with one click; Step 4: Use the dynamic accounting module to synchronize overseas warehouse data, calculate the tax refund amount difference and push the adjustment table; Step 5: Use the risk management module to set threshold warnings, intercept abnormal processes, and conduct audit tracing; Step 6: Encrypt data through the data security module and adapt to the tax policies of different countries through the cross-border e-commerce adaptation module.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A highly efficient and compliant tax refund system for cross-border e-commerce, characterized by: The system includes a data collection module, a blockchain evidence storage module, an intelligent declaration module, a dynamic accounting module, a risk management module, a data security module and a cross-border e-commerce adaptation module; The data collection module is used to collect cross-border e-commerce transaction data in real time and pre-process the collected data; The blockchain evidence storage module adopts alliance chain + shard storage technology to save data; The intelligent declaration module is used to automatically generate compliance declaration messages; The dynamic accounting module adjusts the tax refund amount in real time based on overseas warehouse sales data; The risk control module is used to set a data difference value and issue a risk warning for data exceeding the data difference value; The data security module adopts advanced encryption algorithm to encrypt the data in the system for storage and transmission; The cross-border e-commerce adaptation module automatically adjusts the tax refund process and parameters according to the tax policies of different countries and regions to adapt to the tax refund needs of different markets.

2. The cross-border e-commerce high-efficiency and compliant tax refund system according to claim 1 is characterized by: The data acquisition module includes a multi-source system docking unit and a data formatting processing unit; The multi-source system docking unit is used to establish a two-way connection with the e-commerce platform, enterprise ERP, customs system, and tax system through a technical interface to achieve real-time interactive collection of multiple data such as orders, logistics, customs declarations, and taxes; The data formatting processing unit uses ETL technology to perform standardized conversion on data from different systems.

3. The cross-border e-commerce high-efficiency and compliant tax refund system according to claim 1 is characterized by: The blockchain evidence storage module includes a hash value generation unit, a consortium chain node management unit, a shard storage management unit and a smart contract execution unit; The hash value generation unit is used to encrypt and calculate multiple data such as the cross-border e-commerce order number, SKU, and customs declaration number to generate a unique hash value; The hash value generation formula: ； in, is the hash value, is the order number, is the inventory unit of the product, The customs declaration number, is the timestamp, It is the string concatenation symbol; The alliance chain node management unit is used to coordinate the node permissions and responsibilities of customs, tax departments, and certification companies.

4. The cross-border e-commerce high-efficiency and compliant tax refund system according to claim 3 is characterized by: The shard storage management unit uses HS code or enterprise ID as the basis for sharding, and realizes cross-shard data interaction through the relay chain; The cross-shard data interaction verification formula: ； in, To verify the results, For shard A data, For shard B data, The data for shard C; The smart contract execution unit is used to set pre-trigger conditions, automatically call the smart contract to complete the hash value on-chain evidence storage, and synchronously issue the hash value submission time, and freeze the account in the event of repeated submission or abnormal permissions.

5. The cross-border e-commerce high-efficiency and compliant tax refund system according to claim 1 is characterized by: The intelligent declaration module includes a data acquisition unit, a message generation unit and a one-key trigger declaration unit; The data acquisition unit is used to obtain the purchase data in the enterprise ERP and the sales data of the e-commerce platform in real time through the API interface, and integrate the data to form a basic data set for declaration; The message generation unit automatically generates compliant declaration documents according to the regulations and specifications of the customs "single window" and the tax "electronic tax bureau"; The one-key trigger declaration unit starts the pre-tax refund declaration process through the "one-key" button on the system page, and the data is directly connected to the tax system.

6. The cross-border e-commerce high-efficiency and compliant tax refund system according to claim 1 is characterized by: The dynamic accounting module includes an overseas warehouse data synchronization unit, a tax refund calculation unit, and a difference adjustment declaration unit; The overseas warehouse data synchronization unit synchronizes overseas warehouse sales data, inventory changes, return records and other data information in real time through RESTAPI and MQ message queue interfaces. In addition, TLS1.3 encryption and SM4 algorithm are used to protect sensitive fields during the data synchronization process. The tax refund amount calculation unit is used to calculate the actual tax refund amount based on the purchase price excluding tax, combined with multiple quantities that do not meet the tax refund conditions, according to the first-in-first-out method, and automatically identify data differences.

7. The cross-border e-commerce high-efficiency and compliant tax refund system according to claim 6, characterized in that: The difference adjustment declaration unit is used to automatically generate an adjustment declaration form based on the accounting results, automatically push it to the tax system, and simultaneously update the tax refund status; The calculation formula for the tax refund amount of the difference adjustment declaration unit is: ； in, The difference in tax refund amount, For pre-refund, The actual tax refund amount.

8. The cross-border e-commerce high-efficiency and compliant tax refund system according to claim 1 is characterized by: The risk control module includes an early warning rule setting unit, a process interception execution unit and an audit tracing management unit; The warning rule setting unit is used to preset risk thresholds and automatically push audit notifications when triggered; The process interception execution unit is used to automatically freeze the tax refund process for orders that have not completed sales accounting before the deadline, preventing abnormal transactions from entering the tax refund process; The audit tracing management unit is used to store all operation logs on the chain, and supports cash back tracing through multiple information such as blockchain height and timestamp.

9. The cross-border e-commerce high-efficiency and compliant tax refund system according to claim 1 is characterized by: The data security module uses advanced encryption algorithms to encrypt and store all sensitive data. The data security module also has data access permission control functions and data backup and recovery functions, which can regularly back up key data. The data security module encryption formula: ； in, is the ciphertext, For 128 plaintext, For 128 keys, For encryption mode; The cross-border e-commerce adaptation module is used to adapt tax policies between different countries and regions, and automatically convert tax rates, currency units and tax declaration formats.

10. A tax refund method for a cross-border e-commerce high-efficiency and compliant tax refund system according to any one of claims 1 to 9, characterized in that: The tax refund methods are as follows: Step 1: Connect with multiple source systems through the data collection module to collect various transaction data in real time and perform standardized conversion on the data; Step 2: Generate a hash value using the blockchain evidence storage module, and store it on the blockchain after being managed by the alliance chain node and stored in shards; Step 3: Integrate data through the intelligent reporting module, generate compliance reports and submit reports with one click; Step 4: Use the dynamic accounting module to synchronize overseas warehouse data, calculate the tax refund amount difference and push the adjustment table; Step 5: Use the risk management module to set threshold warnings, intercept abnormal processes, and conduct audit tracing; Step 6: Encrypt data through the data security module and adapt to the tax policies of different countries through the cross-border e-commerce adaptation module.

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