A full-scene legal evidence storage and traceability system and method based on a light guide film

Abstract

The application discloses a full-scene legal evidence storage and traceability system and method based on a light guide film, which stores key operation and state data of users in multiple application scenes such as health monitoring, safety protection, social service, virtual world and smart home in a blockchain through a unified identity authentication center. The system comprises an evidence storage event identification module, an evidence collection module, a blockchain evidence storage module, an evidence verification module, an evidence traceability module and an evidence export module. Key events include life safety, property safety, social service, authorization and data operation. Evidence data comprises event ID, type, time, device, user identity hash value, operation content, result, environment context and associated data hash value. Only evidence hash value is stored in a blockchain, original data is locally AES-256 encrypted, a key is stored in a TEE and is bound to a user light guide film identity. Evidence verification supports single evidence, evidence chain and batch verification, and an evidence chain is constructed through hash association. Evidence traceability calls a data bloodline map patent interface to trace a complete life cycle. A storage report comprises a verification two-dimensional code, a digital signature (a private key is stored in a TEE) and identity anchoring information, and meets judicial requirements. Identity anchoring is verified again through light guide film collection and comparison. The application solves the problems of easy tampering of electronic evidence, scattered evidence storage and difficulty in judicial acceptance, and is a core infrastructure for personal data legal evidence storage.

Description

Technical Field

[0001] This invention relates to the fields of blockchain evidence storage, data traceability, legal evidence management, and privacy protection. Specifically, it relates to a full-scenario legal evidence storage and traceability system and method based on photoconductive film. Through a unified identity authentication center, the system stores key operation and status data of users in multiple application scenarios such as health monitoring, security protection, social services, virtual world, and smart home on the blockchain, ensuring that the evidence is tamper-proof, traceable, and verifiable. This solves the problems of easy tampering, scattered evidence storage, and difficulty in judicial acceptance of electronic evidence in existing technologies. Citation of prior application

[0002] This application is based on the technology of the applicant's previously filed patent application, specifically cited as follows: 1. Prior patent application (application number 2026103505829, application date 2026-03-20, invention title: A method and system for unique identification of human optical spectral features based on photoconductive film) This patent discloses a method for uniquely identifying human optical spectral features. It uses a photoconductive film to collect human optical spectral features and generate a unique feature code for identity verification. The unified identity authentication center in this application references the spectral feature acquisition and comparison technology of this patent as the basis for legally documented identity verification.

[0003] 2. Prior patent application (application number 2026103373270, application date 2026-03-19, invention title: A distributed housekeeping system and method based on multi-terminal collaboration) This patent discloses a distributed housekeeping system based on multi-terminal collaboration, including a main housekeeping unit and sub-housekeeping units. The evidence storage data aggregation framework in this application is implemented based on the housekeeping system architecture of this patent.

[0004] 3. Prior patent application (application number 2026103511641, application date 2026-03-21, invention title: A unified identity authentication and authorization center system and method based on photoconductive film) This patent discloses a unified identity authentication and authorization mechanism, including authorization record management and audit logs. The authorization record technology in this application is reused from that patent.

[0005] 4. Prior patent application (application number 2026103512540, application date 2026-03-21, invention title: A method and system for constructing personal data lineage maps based on photoconductive film) This patent discloses a method for constructing a personal data kinship map, including tracing the data source, flow, and processing chain. The evidence tracing module in this application calls the interface of this patent, inputs the evidence data ID, and returns a complete kinship map.

[0006] 5. Patents for various application scenarios submitted by the applicant. This application provides legal evidence preservation and tracing services for patents in various application scenarios, including health monitoring patents, security protection patents, social service patents, and intelligent interaction patents. The aforementioned prior basic patents were all filed earlier than this application and were not published before the filing date of this application; therefore, they do not constitute prior art for this application. Background Technology

[0007] With the development of smart terminals and IoT technologies, users generate a large amount of critical operational and status data in multiple scenarios (health monitoring, security protection, social services, virtual world, smart home), which may serve as legal evidence (such as car accident rescue records, fraud interception records, family matching records, authorization records, etc.). However, existing legal evidence preservation technologies have the following shortcomings: 1. Evidence is easily tampered with: Electronic evidence is stored locally or in the cloud and can be altered or deleted, making it difficult for the judiciary to accept it; 2. Dispersed evidence storage: Each application stores evidence independently, resulting in evidence being scattered across different systems and failing to form a complete chain of evidence; 3. Unreliable source: It is impossible to prove whether the source, time, or equipment used for collecting the evidence is credible; 4. Difficulty in verifying identity: It is impossible to prove that the user identity corresponding to the evidence is genuine; 5. Difficulty in tracing the source: After evidence has been processed and transferred multiple times, it is difficult to trace the original data and intermediate processes; 6. Low judicial acceptance rate: Due to the lack of technical safeguards that meet the requirements of the Electronic Signature Law and the Provisions of the Supreme People's Court on Several Issues Concerning Evidence in Civil Litigation, the probability of evidence being accepted by the court is low.

[0008] The applicant has previously filed patents for a distributed steward system, a unified identity authentication system, and a data lineage graph. Building upon these, this invention further constructs a full-scenario legal evidence preservation and traceability system, enabling blockchain-based evidence preservation, identity anchoring, source verification, and complete traceability of key data. Summary of the Invention

[0009] (a) Purpose of the invention The purpose of this invention is to provide a full-scenario legal evidence storage and traceability system and method based on photoconductive film. By using a unified identity authentication center, the system stores key operation and status data of users in multiple application scenarios such as health monitoring, security protection, social services, virtual world, and smart home on the blockchain, ensuring that the evidence is tamper-proof, traceable, and verifiable, and solving the problems of easy tampering, scattered evidence storage, and difficulty in judicial acceptance of electronic evidence in the prior art.

[0010] (II) Technical Solution 1. A full-scenario legal evidence preservation and traceability system based on photoconductive film, characterized in that it includes: The unified identity authentication center is used to collect the optical spectral characteristics of a user's human body through a photoconductive film and generate a unique identity feature code, which serves as the basis for legally stored identity verification. The evidence preservation event identification module is used to identify key events that need to be preserved in various application scenarios and trigger the evidence preservation process. The evidence collection module is used to collect complete evidence data for key events, including event type, time of occurrence, device of occurrence, user identity, operation content, operation result, environmental context, and hash value of associated data; The blockchain evidence storage module is used to calculate the hash value of evidence data and store it on the blockchain, generating a storage transaction ID and a storage timestamp. The original evidence data is encrypted and stored locally in the management unit. The evidence verification module is used to verify the integrity, authenticity, and tamper-proof nature of evidence by comparing the current data hash value with the on-chain hash value. The evidence tracing module is used to trace the complete lifecycle of evidence through data lineage mapping, including data source, processing chain, transfer records, and authorization records; The evidence export module supports users in exporting evidence reports that meet judicial requirements, including evidence data, evidence hash, evidence storage time, identity anchoring information, and verification QR code.

[0011] 2. The system according to claim 1, wherein the key events requiring evidence storage in the evidence storage event identification module include: life safety events, property safety events, social service events, authorization events, and data operation events; users can customize the types of events requiring evidence storage in the unified identity authentication center.

[0012] 3. The system according to claim 1, wherein the evidence data in the evidence collection module includes: event ID, event type, occurrence time, occurrence device, user identity feature code hash value, operation content, operation result, environmental context, and associated data hash value.

[0013] 4. The system according to claim 1, characterized in that, in the blockchain evidence storage module, the data stored on the chain is the SHA-256 hash value of the evidence data, and does not include the original evidence data; the blockchain adopts a nationally certified judicial consortium blockchain; the original evidence data is encrypted and stored locally in the supervisory unit using AES-256, and the encryption key is stored in the terminal security area (TEE trusted execution environment), which is bound to the user's optical guide film identity feature code and can only be accessed by the user; when the user changes devices, the encrypted data must be synchronized from the cloud after authentication through the optical guide film, and the key is transmitted through a secure channel.

[0014] 5. The system according to claim 1, wherein the evidence verification module supports the following verification methods: single evidence verification, evidence chain verification, and batch verification; the verification result includes whether it passes, on-chain hash value, current hash value, evidence storage time, and verification time; the evidence chain is constructed by hashing the evidence storage transaction ID of each piece of evidence with the evidence storage transaction ID of the previous piece of evidence to form an immutable temporal association.

[0015] 6. The system according to claim 1, characterized in that the evidence tracing module calls the interface of the data lineage map patent (application number 2026103512540), inputs the evidence data ID, and returns the complete lineage map of the data, including source tracing, processing link tracing, circulation record tracing, and authorization record tracing; the tracing results are displayed in the form of a directed acyclic graph and can be exported as PDF.

[0016] 7. The system according to claim 1, characterized in that, in the evidence export module, the evidence storage report includes: evidence data, evidence storage hash value, blockchain evidence storage transaction ID, evidence storage time, identity anchoring information, verification QR code, report generation time, report number, and user signature; the report adopts digital signature anti-counterfeiting, the digital signature private key is stored in the terminal security area (TEE), bound to the user's optical guide film identity feature code, and cannot be exported or copied; the report complies with the requirements of the Electronic Signature Law and Article 11 of the Provisions of the Supreme People's Court on Several Issues Concerning the Trial of Cases by Internet Courts regarding blockchain evidence storage.

[0017] 8. A method for legal evidence preservation and traceability across all scenarios based on photoconductive films, characterized by comprising the following steps: S1: Users complete identity authentication through the optical guide film, establishing a unified identity across scenarios; S2: The evidence preservation event recognition module monitors various application scenarios in real time and identifies key events that need to be preserved. S3: When a key event is identified, the evidence collection module collects complete evidence data; S4: Evidence data is encrypted and stored locally in the supervisor's unit; S5: The blockchain evidence storage module calculates the hash value of the evidence data, stores it on the blockchain, and generates a storage transaction ID and a storage timestamp. S6: After the evidence is stored, the system pushes the evidence storage result to the user terminal; S7: Users verify the integrity of evidence through the evidence verification module; S8: Users can trace the entire lifecycle of evidence through the evidence tracing module; S9: Users can export evidence reports that meet judicial requirements through the evidence export module.

[0018] 9. The method according to claim 8, wherein in step S5, the on-chain evidence storage adopts a nationally certified judicial consortium blockchain, and the stored evidence data includes the evidence hash value, storage time, user identity feature code hash value, and storage event type; the storage transaction ID serves as the unique identifier of the evidence, and the user can use this to query the storage record on the judicial blockchain platform.

[0019] 10. The method according to claim 8, characterized in that, in step S9, the evidence storage report adopts digital signature anti-counterfeiting, includes a verification QR code, and after scanning the QR code, the system automatically verifies the integrity of the evidence and displays the verification result; the user can add an electronic signature to the evidence storage report, and the signature information is synchronously stored on the blockchain; the identity anchor is verified in the following way: the user collects spectral features again through the photoconductive film, generates a hash value, compares it with the hash value in the evidence storage, and if they match, it proves that the user at the time of evidence storage and the current user are the same person. This verification process is provided by the judicial blockchain platform with online verification tools.

[0020] 11. A computer-readable storage medium having a computer program stored thereon, characterized in that, when the program is executed by a processor, it implements the method according to any one of claims 8-10.

[0021] 12. An electronic device comprising a processor and a memory, the memory storing a computer program, characterized in that, when executed by the processor, the program implements the method according to any one of claims 8-10. Detailed Implementation

[0022] System architecture and data flow The core innovation of this system lies in combining a distributed steward system, unified identity authentication, data lineage graph, and blockchain evidence storage to achieve legal-level evidence storage and complete traceability of key events.

[0023] The system architecture is as follows: Unified Identity Authentication Center: Deployed on the user's designated home device (default mobile phone), it uses a unique identity recognition system based on a photoconductor film as the foundation for identity anchoring in legal evidence storage. Identity anchoring is achieved as follows: The stored evidence data contains the user's identity feature code hash value. When identity verification is required, the user again uses the photoconductor film to collect spectral features, generating a hash value, which is compared with the hash value in the stored evidence. If they match, it proves that the user at the time of evidence storage is the same person as the current user. This verification process is supported by an online verification tool provided by the judicial blockchain platform, which can be used directly by the court.

[0024] Supervisor Unit: Responsible for identifying evidence-preserving events, collecting evidence, encrypting and storing it, storing it on the blockchain, verifying evidence, tracing the source of evidence, and exporting reports.

[0025] Sub-Manager Unit: A lightweight software module installed on various smart terminal devices. Each sub-manager corresponds to an application scenario and is responsible for reporting critical events.

[0026] Judicial Consortium Blockchain: Employs a nationally certified judicial blockchain platform (such as the Supreme People's Court's judicial blockchain platform).

[0027] Data flow path: 1. Users complete identity authentication through the optical guide film, establishing a unified identity; 2. The sub-manager reports key incidents to the supervisor; 3. The supervisor collects evidence data, encrypts and stores it, and stores the key in the Terminal Secure Area (TEE), which is bound to the user's optical guide film identity feature code; 4. The supervisor calculates the hash value of the evidence and stores it on the blockchain; 5. The on-chain return of the notarized transaction ID and timestamp; 6. When a user queries evidence, the system pulls the stored evidence records from the blockchain and compares and verifies them with local evidence; 7. Users can access the data lineage diagram patent interface through the evidence tracing module to view the evidence lineage diagram; 8. Users can export evidence reports, which are protected by digital signatures.

[0028] The following provides a detailed description of each module: Example 1: Evidence Preservation in Car Accident Rescue Events User Zhang was involved in a car collision, and the in-vehicle emergency assistance application detected the collision (a life-threatening event). The system identified it as a critical event requiring evidence storage and collected the following evidence data: • Event ID: EVT_20260321_001 • Event type: Car accident detection • Time of occurrence: 2026-03-21 14:30:15.123 • Generating device: Vehicle terminal (Device ID: CAR_001) • User Identity: Hash value of the optical guide film's identity feature code (the original feature code is not stored). • Operation: A vehicle collision is detected with an acceleration of 25 m / s², triggering an emergency call. • Operation result: Successful, 120 has been dialed • Context: Vehicle speed 80km / h, location Nanshan District, Shenzhen • Related data hash value: SHA-256 hash value of acceleration data at the moment of collision Evidence data is encrypted and stored locally on the user's mobile phone. The encryption key is stored in the TEE (Telematics Equipment) and bound to the user's identity feature code. After calculating the hash value, the evidence is uploaded to the nationally certified judicial consortium blockchain. The blockchain returns the evidence storage transaction ID: TX_20260321_001, and the evidence storage timestamp: 2026-03-21 14:30:17.456. The system pushes the evidence storage result to the user's terminal: "Your car accident has been evidence stored, evidence storage ID: TX_20260321_001, which can be queried on the judicial blockchain platform." Example 2: Evidence Preservation for Fraud Interception Incidents User Li received a fraudulent phone call. The anti-fraud application detected a suspicious fraud pattern, automatically blocked and hung up the call (a property security incident). The system collected evidence data, and the hash value was stored on the blockchain as evidence. Afterwards, Li suspected the call might not have been a scam and verified the integrity of the evidence through the evidence verification module. The system compared the current data hash value with the on-chain hash value, and the verification passed, displaying "Evidence has not been tampered with, storage time 2026-03-21 15:20:32.123". The user exported the evidence report as evidence to file a complaint with the operator.

[0029] Example 3: Evidence Preservation for Family Matching Events User Wang found a long-lost relative through a family-finding app (a social service event). The system collected evidence data and stored it on the blockchain. Wang exported the storage report as supporting evidence for applying for a paternity test with the public security authorities. The storage report includes the matching result, storage time, and identity anchoring information. The public security authorities can verify the authenticity of the evidence online by scanning a QR code. Identity anchoring verification: Wang again collected spectral characteristics through a photoconductive film, generated a hash value, and compared it with the hash value in the storage report. The match proved that the user at the time of storage and the current user are the same person.

[0030] Example 4: Authorization Operation Evidence Storage and Chain of Evidence Verification User Zhang authorized a health app to read his blood pressure data (an authorization-related event). The system collected the authorization record and stored it on the blockchain as evidence. Three months later, Zhang discovered that the app had read his blood glucose data outside the authorized scope and revoked the authorization. Zhang traced the complete lifecycle of the authorization record through the evidence tracing module. The evidence tracing module calls the interface of the data lineage graph patent (application number 2026103512540), inputs the evidence data ID, and returns a complete lineage graph, including source tracing, processing link tracing, circulation record tracing, and authorization record tracing, displayed in the form of a directed acyclic graph. Zhang exported the tracing report as evidence for his rights protection. The evidence chain is constructed by hashing the evidence storage transaction ID of each piece of evidence with the evidence storage transaction ID of the previous piece of evidence, forming an immutable temporal association.

[0031] Example 5: Exporting and Verifying Evidence Reports User Zhang exported a car accident evidence report, which included: • Evidence data (after anonymization: collision detection, acceleration, position) • Evidence hash value: 0x7f83b1657ff1fc53b92dc18148a1d65dfc2d4b1fa3d677284addd200126d9069 • Blockchain-based notarized transaction ID: TX_20260321_001 • Evidence storage time: 2026-03-21 14:30:17.456 • Identity anchoring information: User identity feature code hash value • Verify QR code: Scan to be redirected to the judicial blockchain platform verification page. • Report Number: REP_20260321_001 • Digital signature: Signed with the user's private key, which is stored in the TEE and bound to the user's optical transceiver membrane identity code. It cannot be exported. Mr. Zhang submitted the report to the insurance company for claim processing. The insurance company scanned the QR code, and the system automatically verified the integrity of the evidence, displaying the verification result: "Evidence is complete, has not been tampered with, storage time 2026-03-21 14:30:17.456, user identity verified." The insurance company accepted the evidence and quickly completed the claim processing. The evidence storage method of this system complies with Article 11 of the "Provisions of the Supreme People's Court on Several Issues Concerning the Trial of Cases by Internet Courts" regarding blockchain evidence storage, and the evidence can be accepted by the court. Exception handling mechanism

[0032] 1. Handling of evidence storage failure: When evidence storage on the blockchain fails, the system will automatically retry 3 times, with an interval of 5 seconds between each attempt; if it still fails, it will mark "evidence storage failed" locally and push a reminder to the user to retry manually; the user can manually trigger evidence storage after the network is restored.

[0033] 2. Handling of evidence verification failures: If an inconsistent hash value is found during verification, the system marks "evidence has been tampered with" and sends a push notification: "Evidence has been tampered with. Please check data integrity." 3. Blockchain network interruption handling: When the network is interrupted, the evidence data is temporarily stored locally and automatically re-uploaded after the network is restored; the temporary data is retained for 30 days and will be automatically deleted if it is not uploaded within the time limit.

[0034] 4. Anti-counterfeiting of the evidence report: The report uses a digital signature, and the signature private key is stored in the TEE and cannot be exported; if the report is tampered with, the signature verification will fail, and the system will prompt "The report has been tampered with, please obtain the original report".

[0035] 5. Key Loss Handling: If a key is lost, the user can apply for a reset, but historical evidence data will be undecryptable (re-certification is required). When a user changes devices, they must authenticate their identity through the optical guide film, and then the encrypted data will be synchronized from the cloud. The key is transmitted through a secure channel and will not be exposed to third parties. Beneficial effects

[0036] 1. Evidence is immutable: The hash value of the evidence is stored on the blockchain. Any tampering will result in inconsistent hash values, ensuring the authenticity of the evidence. 2. High judicial credibility: The evidence is stored using a nationally certified judicial blockchain, which complies with the Electronic Signature Law and the judicial interpretations of the Supreme People's Court, and the evidence can be accepted by the court. 3. Identity Anchoring: The stored evidence data contains the hash value of the user's identity feature code. During verification, the data is collected and compared again through the optical guide film to ensure that the user identity corresponding to the evidence is authentic and credible. 4. Complete traceability: By calling the patent interface of the data lineage map, the complete life cycle of evidence can be traced (source, processing, circulation, and authorization). 5. Comprehensive Evidence Preservation: Covering all key events across all scenarios, including life safety, property safety, social services, authorized operations, and data operations; 6. Convenient verification: Supports single evidence verification, chain of evidence verification, and batch verification; online verification can be performed by scanning a QR code. 7. Report Compliance: The evidence storage report includes a verification QR code, digital signature (private key stored in TEE), and identity anchoring information, which complies with judicial requirements; 8. Privacy Protection: On-chain evidence storage only includes hash values, the original evidence data is locally AES-256 encrypted, and the key is stored in a TEE, which is fully controlled by the user; 9. Key Security: The key is bound to the user's optical guide film identification code, stored in the TEE, cannot be exported, and can be securely migrated when changing devices; 10. Technological Synergy: This system integrates a distributed steward system, unified identity authentication, data lineage graph, and blockchain evidence storage to form a complete legal evidence storage closed loop of "identity → event → evidence storage → traceability → verification".

Claims

1. A full-scenario legal evidence preservation and traceability system based on photoconductive film, characterized in that, include: The unified identity authentication center is used to collect the optical spectral characteristics of a user's human body through a photoconductive film and generate a unique identity feature code, which serves as the basis for legally stored identity verification. The evidence preservation event identification module is used to identify key events that need to be preserved in various application scenarios and trigger the evidence preservation process. The evidence collection module is used to collect complete evidence data for key events, including event type, time of occurrence, device of occurrence, user identity, operation content, operation result, environmental context, and hash value of associated data; The blockchain evidence storage module is used to calculate the hash value of evidence data and store it on the blockchain, generating a storage transaction ID and a storage timestamp. The original evidence data is encrypted and stored locally in the management unit. The evidence verification module is used to verify the integrity, authenticity, and tamper-proof nature of evidence by comparing the current data hash value with the on-chain hash value. The evidence tracing module is used to trace the complete lifecycle of evidence through data lineage mapping, including data source, processing chain, transfer records, and authorization records; The evidence export module supports users in exporting evidence reports that meet judicial requirements, including evidence data, evidence hash, evidence storage time, identity anchoring information, and verification QR code.

2. The system according to claim 1, characterized in that, The key events requiring evidence storage in the evidence storage event identification module include: life safety events, property safety events, social service events, authorization events, and data operation events; users can customize the types of events requiring evidence storage in the unified identity authentication center.

3. The system according to claim 1, characterized in that, In the evidence collection module, the evidence data includes: event ID, event type, occurrence time, occurrence device, user identity feature code hash value, operation content, operation result, environmental context, and associated data hash value.

4. The system according to claim 1, characterized in that, In the blockchain evidence storage module, the data stored on the chain is the SHA-256 hash value of the evidence data, and does not include the original evidence data; the blockchain adopts a nationally certified judicial consortium blockchain; the original evidence data is encrypted and stored locally in the supervisory unit using AES-256, and the encryption key is stored in the terminal security area and bound to the user's optical guide film identity feature code, which can only be accessed by the user.

5. The system according to claim 1, characterized in that, The evidence verification module supports the following verification methods: single evidence verification, evidence chain verification, and batch verification. The evidence chain is constructed by hashing the evidence storage transaction ID of each piece of evidence with the evidence storage transaction ID of the previous piece of evidence to form an immutable temporal association.

6. The system according to claim 1, characterized in that, The evidence tracing module calls the interface of the data lineage graph patent, inputs the evidence data ID, and returns the complete lineage graph of the data, including source tracing, processing link tracing, circulation record tracing, and authorization record tracing; the tracing results are displayed in the form of a directed acyclic graph and can be exported as PDF.

7. The system according to claim 1, characterized in that, The evidence export module includes the following evidence report: evidence data, evidence hash value, blockchain evidence transaction ID, evidence storage time, identity anchoring information, verification QR code, report generation time, report number, and user signature. The report uses digital signature anti-counterfeiting, and the digital signature private key is stored in the terminal's secure area, bound to the user's optical guide film identity feature code, and cannot be exported or copied. The report complies with the requirements of the Electronic Signature Law and the provisions of the Supreme People's Court on several issues concerning the trial of cases by Internet courts regarding blockchain evidence storage.

8. A method for full-scenario legal evidence preservation and traceability based on photoconductive film, characterized in that, Includes the following steps: S1: Users complete identity authentication through the optical guide film, establishing a unified identity across scenarios; S2: The evidence preservation event recognition module monitors various application scenarios in real time and identifies key events that need to be preserved. S3: When a key event is identified, the evidence collection module collects complete evidence data; S4: Evidence data is encrypted and stored locally in the supervisor's unit; S5: The blockchain evidence storage module calculates the hash value of the evidence data, stores it on the blockchain, and generates a storage transaction ID and a storage timestamp. S6: After the evidence is stored, the system pushes the evidence storage result to the user terminal; S7: Users verify the integrity of evidence through the evidence verification module; S8: Users can trace the entire lifecycle of evidence through the evidence tracing module; S9: Users can export evidence reports that meet judicial requirements through the evidence export module.

9. The method according to claim 8, characterized in that, In step S5, the on-chain evidence storage uses a nationally certified judicial consortium blockchain. The stored data includes the evidence hash value, storage time, user identity feature code hash value, and storage event type. The storage transaction ID serves as the unique identifier of the evidence, which users can use to query storage records on the judicial blockchain platform. In step S9, the storage report uses digital signature anti-counterfeiting and includes a verification QR code. After scanning the QR code, the system automatically verifies the integrity of the evidence and displays the verification result. Users can add electronic signatures to the storage report, and the signature information is synchronously stored on the blockchain.

10. The method according to claim 8, characterized in that, Identity verification is achieved through the following method: the user collects spectral features again through the optical guide film, generates a hash value, and compares it with the hash value in the evidence storage. If they match, it proves that the user at the time of evidence storage and the current user are the same person. This verification process is provided by the judicial blockchain platform with online verification tools.