Block chain-based warranty whole-process security verification method and system

Abstract

The invention provides a warranty full-process security verification method and system based on a block chain, and relates to the technical field of security verification, and the method comprises the steps: carrying out the storage chaining of the application information of a warranty application; checking the application information to sign and issue an electronic warrant, and carrying out query verification on the electronic warrant; performing cashing performance verification based on the electronic warrant to execute cashing; and cashing execution is supervised, and auditing verification is carried out. The technical problem that the accuracy and timeliness of the cashing process are further influenced and the reliability and efficiency of the electronic warrant are reduced due to the fact that the intelligent contract rule setting is incomplete and the intelligent judgment capability is insufficient in the prior art can be solved, the intelligent and automatic cashing and performance monitoring system is realized, and the user experience is improved. The technical effects of improving the accuracy, efficiency and transparency of the cashing process, ensuring that the smart contract can be correctly executed in a complex situation, and further improving the reliability and credibility of the electronic warrant are achieved.

Description

Technical Field

[0001] This application relates to the field of security verification technologies, and in particular, to a method and system for the full-process security verification of guarantee letters based on blockchain. Background Art

[0002] As a new type of digital guarantee tool, electronic guarantee letters are widely used in multiple industries such as finance and engineering construction, aiming to solve problems existing in traditional guarantee methods, such as difficult management of paper documents, cumbersome signing processes, and lack of transparency in performance monitoring. Electronic guarantee letters use blockchain technology for evidence storage and automatic execution of smart contracts, and can provide more efficient and secure guarantee services. However, despite the obvious advantages of electronic guarantee letters, the existing technologies still face some key problems and challenges, and further technological innovation and improvement are urgently needed.

[0003] Currently, the current electronic guarantee letter technology lacks sufficient intelligent means in payment and performance monitoring. Although smart contracts can achieve automatic execution to a certain extent, for complex default situations and detailed problems, the judgment ability of existing systems is still limited. For example, when multiple conditions are simultaneously met, how to intelligently determine the specific payment amount, handle disputes and acceptance criteria, etc., and the existing technologies have not been able to fully solve these practical problems. The execution of smart contracts depends on pre-set rules. If the rules are not set perfectly or disputes occur among participating parties, the smart contract may not be able to correctly handle complex situations, resulting in errors or delays in the payment process.

[0004] In summary, there are technical problems in the existing technologies that due to imperfect setting of smart contract rules and insufficient intelligent judgment ability, it is impossible to accurately handle issues such as payment amounts, disputes, and acceptance criteria in complex default situations, further affecting the accuracy and timeliness of the payment process, thereby reducing the reliability and efficiency of electronic guarantee letters. Summary of the Invention

[0005] The purpose of this application is to provide a method and system for the full-process security verification of guarantee letters based on blockchain, so as to solve the technical problems in the existing technologies that due to imperfect setting of smart contract rules and insufficient intelligent judgment ability, it is impossible to accurately handle issues such as payment amounts, disputes, and acceptance criteria in complex default situations, further affecting the accuracy and timeliness of the payment process, thereby reducing the reliability and efficiency of electronic guarantee letters.

[0006] In view of the above problems, this application provides a method and system for the full-process security verification of guarantee letters based on blockchain.

[0007] In a first aspect, the present application provides a method for secure verification of the entire process of a guarantee letter based on blockchain, which is implemented through a system for secure verification of the entire process of a guarantee letter based on blockchain, including: storing the application information of the guarantee letter application on the blockchain; reviewing the application information to issue an electronic guarantee letter, and performing query verification of the electronic guarantee letter; performing payment performance verification based on the electronic guarantee letter to execute payment; supervising the execution of payment, and performing audit verification.

[0008] In a second aspect, the present application further provides a system for secure verification of the entire process of a guarantee letter based on blockchain, which is used to execute the method for secure verification of the entire process of a guarantee letter based on blockchain as described in the first aspect, including: an application module, which is used to store the application information of the guarantee letter application on the blockchain; an issuance module, which is used to review the application information to issue an electronic guarantee letter, and perform query verification of the electronic guarantee letter; a payment module, which is used to perform payment performance verification based on the electronic guarantee letter to execute payment; a supervision module, which is used to supervise the execution of payment, and perform audit verification.

[0009] The technical solutions provided in the present application have at least the following technical effects or advantages: by implementing an intelligent and automated payment and performance monitoring system, the accuracy, efficiency, and transparency of the payment process are improved, ensuring that the smart contract can be correctly executed in complex scenarios, thereby enhancing the reliability and trust of the electronic guarantee letter.

[0010] The above description is only an overview of the technical solutions of the present application. In order to be able to more clearly understand the technical means of the present application, it can be implemented in accordance with the content of the specification. And in order to make the above and other purposes, features, and advantages of the present application more obvious and understandable, the following specific embodiments of the present application are specifically given. It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present application, nor is it used to limit the scope of the present application. Other features of the present application will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the technical solutions in the present application or in the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings described below are only exemplary, and for those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without creative efforts.

[0012] Figure 1 It is a flowchart of the method for secure verification of the entire process of a guarantee letter based on blockchain in the present application; Figure 2 It is a structural diagram of the system for secure verification of the entire process of a guarantee letter based on blockchain in the present application.

[0013] Explanation of reference numerals: Application module 11, Issuing module 12, Cashing module 13, Supervision module 14. Detailed implementation manners

[0014] This application provides a method and system for secure verification of the entire process of a guarantee letter based on blockchain, which solves the problems in the prior art that due to imperfect setting of smart contract rules and insufficient intelligent judgment ability, it is impossible to accurately handle the cashing amount, disputes, acceptance criteria, etc. in complex default situations, further affecting the accuracy and timeliness of the cashing process, thus reducing the reliability and efficiency of electronic guarantee letters. It realizes an intelligent and automated cashing and performance monitoring system, achieving the technical effects of improving the accuracy, efficiency, and transparency of the cashing process, ensuring that smart contracts can be correctly executed in complex situations, and further enhancing the reliability and trust of electronic guarantee letters.

[0015] Next, the technical solutions in this application will be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all the embodiments of this application. It should be understood that this application is not limited by the example embodiments described here. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of this application. Additionally, it should be noted that for the sake of description, only the parts related to this application are shown in the accompanying drawings rather than all of them.

[0016] Embodiment 1. Please refer to the appended Figure 1 , this application provides a method for secure verification of the entire process of a guarantee letter based on blockchain, which is applied to a system for secure verification of the entire process of a guarantee letter based on blockchain, and specifically includes the following steps: S1: Archive the application information of the guarantee letter application onto the blockchain.

[0017] Specifically, archiving the application information of the guarantee letter application onto the blockchain means storing all the key information related to the guarantee letter application on the blockchain to ensure the authenticity and immutability of the data. A guarantee letter application refers to a request submitted by an applicant to a guarantee institution. The applicant can be an enterprise or an individual, and the guarantee institution is usually a bank or an insurance company. The application information refers to all the materials submitted by the applicant, including key data such as the application number, applicant identity, guarantee amount, guarantee scope, beneficiary name, etc. These data determine the content and legal effect of the guarantee letter. Archiving means recording a certain piece of information in a trusted environment to make it have the ability to prove legally, so that its authenticity can be verified at any time in the future. Uploading to the blockchain means writing the data into the blockchain to make it a part of the blockchain, ensuring that the data cannot be modified or tampered with, and can be queried and verified by all authorized parties.

[0018] S2: Review the application information to issue an electronic guarantee letter and conduct query verification of the electronic guarantee letter.

[0019] Specifically, reviewing the application information to issue an electronic guarantee letter means that after receiving the guarantee letter application submitted by the applicant, the guarantee institution needs to conduct a strict review of the application information. Only after ensuring that it meets the guarantee requirements can it officially issue the electronic guarantee letter. The application information includes, but is not limited to, the application number, applicant identity, guarantee amount, contract terms, and beneficiary information. These data determine the validity and scope of application of the guarantee letter. The review process involves the guarantee institution's assessment of the applicant's credit status, financial ability, performance record, and contract compliance to ensure that the applicant has the ability to perform the contract and that there are no fraud or legal risks in the guarantee transaction. After the review is completed and meets the requirements, the guarantee institution will generate an electronic guarantee letter, which is a digital guarantee document. Compared with the traditional paper guarantee letter, the electronic guarantee letter has higher security and convenience and can be anti-counterfeited and archived through blockchain technology or digital signatures to prevent tampering and forgery.

[0020] Conducting query verification of the electronic guarantee letter means that after the electronic guarantee letter is issued, relevant parties can verify the authenticity, integrity, and validity of the guarantee letter through specific query methods. Query means that the beneficiary, regulatory agency, or other authorized parties can check the detailed information of the guarantee letter through the blockchain system, online query platform, or electronic signature verification tool. Verification means that by comparing the hash value, digital signature, or blockchain archival data stored in the electronic guarantee letter, it is ensured that the guarantee letter has not been tampered with and is still in an effective state. If the electronic guarantee letter contains blockchain archival technology, relevant information of the guarantee letter can be read through a smart contract during the query, and it can be verified whether the storage time, issuer, and signature are consistent with the original record. If the electronic guarantee letter uses an electronic signature, during the verification, it can be checked whether the digital certificate of the guarantee institution is valid, whether the signature matches, and whether it meets the issuance standards of the guarantee institution.

[0021] S3: Based on the electronic guarantee letter, conduct payment performance verification to execute the payment.

[0022] Specifically, the performance verification for redemption based on an electronic guarantee means that in the performance or redemption process, it is automatically determined whether the redemption requirements are met according to the terms and conditions contained in the electronic guarantee. An electronic guarantee is a digital guarantee document that records the guaranteed amount, scope of application, guarantee institution, and beneficiary information, ensuring that when the contract performance fails or the redemption conditions are met, the guarantee institution can make a fund payment. Redemption refers to the payment of the agreed amount by the guarantee institution to the beneficiary under specific circumstances. For example, in a performance guarantee, if the applicant fails to complete the project as required by the contract, the beneficiary can apply for redemption based on the guarantee. Performance verification means that the system checks whether the applicant has fulfilled the obligations as agreed in the contract, which may involve steps such as the performance of the contract, confirmation of the facts of breach of contract, and review of relevant evidence. This process is usually executed by a smart contract on the blockchain, which can ensure the transparency, fairness, and immutability of the verification process, while reducing human intervention and improving the execution efficiency.

[0023] Executing redemption means that after the performance verification is completed, if the redemption conditions are met, the redemption process will be automatically executed to ensure that the funds are paid to the beneficiary in accordance with the guarantee terms. Execution refers to triggering the redemption operation according to the preset rules of the smart contract without manual intervention, ensuring the timeliness and security of the payment process. The specific methods of redemption may include bank account transfer, digital currency payment, or multi-party co-managed wallet transactions based on the blockchain to prevent the illegal appropriation or delay of funds. The entire process ensures that the guarantee institution fulfills its guarantee liability, reduces the potential financial losses faced by the beneficiary due to contract breach, and at the same time avoids the risk of the applicant maliciously evading the guarantee liability.

[0024] S4: Supervise the execution of redemption and conduct audit verification.

[0025] Specifically, supervising the execution of redemption means that the regulatory agency supervises the redemption process in the electronic guarantee to ensure that the redemption operation is carried out in accordance with the established rules and terms. Redemption refers to the payment of the guarantee amount or a part of the amount by the guarantee institution to the beneficiary when the triggering conditions of the guarantee are met. Supervision plays an important role in this process to ensure that there is no risk of violation or abuse in the redemption operation. For example, if the project party A in a construction project breaches the contract and the beneficiary requests compensation according to the electronic guarantee, the regulatory agency needs to ensure that the guarantee institution executes the redemption in accordance with the contract terms after verifying the facts of the breach. This process requires the review and approval of the regulatory agency to ensure its legality and compliance.

[0026] Conducting audit verification means that after the redemption execution, the regulatory agency will conduct an audit verification of the redemption behavior. Audit verification refers to a detailed inspection of all data, evidence, and operations involved in the redemption process to ensure that every link of the redemption complies with the contract requirements and there are no errors or fraudulent acts. Audit verification may include multiple links such as checking default certificates, verifying contract terms, and reviewing the flow of funds. Through the audit, the regulatory agency can confirm whether the funds are correctly paid to the legal beneficiaries and ensure that all operations comply with transparency and fairness. For example, if the redemption amount involved in an electronic guarantee letter is five million yuan, the regulatory agency will verify the default records, review the application materials, confirm whether the redemption conditions are met, and ensure that there are no illegal operations during the payment process.

[0027] Furthermore, this application also includes: uploading the application information onto the blockchain based on the guarantee letter application submitted by the applicant; authenticating the applicant's identity based on blockchain; if the applicant's identity authentication is passed, conducting hash deposit for the application information.

[0028] Specifically, the guarantee letter application submitted by the applicant to the guarantee agency refers to a request made by one party of the contract (usually an enterprise or individual in need of guarantee) to the guarantee agency (such as a bank or an insurance company) hoping to obtain an electronic guarantee letter. This guarantee letter is a commitment document, and the guarantee agency undertakes to compensate the beneficiary according to the amount stipulated in the guarantee letter if the applicant fails to fulfill the contract obligations. The process of submitting the guarantee letter application usually includes providing relevant supporting materials such as enterprise qualifications, credit records, and contract copies to enable the guarantee agency to review the applicant's performance ability and credit status. In the blockchain environment, the guarantee letter application information needs to be uploaded onto the blockchain, that is, writing the relevant data into the blockchain to make it an immutable record and ensure the transparency and credibility of the entire process.

[0029] Authenticating the applicant's identity based on blockchain means that after submitting the guarantee letter application, the applicant's identity is verified using blockchain technology. By adopting decentralized identity authentication (DID) or digital certificates and other methods, it is ensured that the applicant's identity information is true and valid. Identity authentication may involve various data validations, such as enterprise registration information, legal person identity, tax information, etc., to prevent fraud or false applications. The characteristic of blockchain identity authentication is that the data is traceable and difficult to forge. Compared with traditional identity authentication methods, it can improve security and credibility. Only when the applicant's identity is authenticated will the guarantee letter application information be further processed, thus avoiding unauthorized users from submitting false applications.

[0030] If the applicant's identity authentication is passed, the application information is hashed and stored as evidence, which means that after the identity verification is successful, the relevant data of the guarantee letter application will be converted into a hash value and stored on the blockchain. The hash value is a unique data fingerprint calculated through cryptographic algorithms. Even if any character of the application information changes, the hash value will be completely different. Therefore, hash-based evidence storage can effectively prevent tampering. The role of evidence storage is to ensure the authenticity and integrity of the guarantee letter application, enabling the guarantee institution, the beneficiary, and other relevant parties to verify the validity of the application information in the future. In this way, even if a party attempts to tamper with the original guarantee letter application data, the hash value stored on the chain remains unchanged, playing a reliable role in evidence storage. Table 1 shows the record of the application information submitted by the applicant for the most recent time.

[0031] Table 1: Record of the Application Information Submitted by the Applicant for the Most Recent Time Field Name Data Type Description Example Data Application Number String Number uniquely identifying the application APP20250327001 Applicant Name String Enterprise or individual applying for the guarantee Construction Co., Ltd. Applicant Identity ID String Unique identity identifier of the applicant (blockchain DID) DID:CN-ABC123XYZ Guarantee Institution String Bank or insurance company providing the guarantee Bank Application Time Date and Time Time when the application was submitted March 27, 2025, 14:30 Guarantee Type String Category of the guarantee, such as performance guarantee, tender guarantee, etc. Performance Guarantee Guarantee Amount Numeric Amount guaranteed by the guarantee 1 million yuan Beneficiary Name String Beneficiary party of the guarantee Real Estate Development Company Scope of Liability String Scope of liability assumed by the guarantee institution Compensation will be made if the project is not completed according to the contract Application Status String Current status of the application Pending Identity Authentication Furthermore, this application also includes: using a smart contract in the blockchain to verify the application conditions of the application information to obtain an application condition verification result; if the application condition verification result is passed, multi-signature verification will be performed.

[0032] Specifically, using a smart contract in the blockchain to verify the application conditions of the application information means that in the blockchain environment, the smart contract will automatically review the guarantee letter application information submitted by the applicant to determine whether it meets the pre-set conditions. The blockchain is a distributed ledger technology that can ensure data transparency and immutability, while the smart contract is an automated program running on the blockchain that can automatically execute corresponding operations when specific conditions are met. Verification refers to checking and validating the application information to ensure that the submitted data meets the requirements and to avoid invalid or fraudulent applications. The application information includes key data such as the application number, applicant identity, guarantee amount, scope of liability, beneficiary name, etc., and the application conditions are usually preset by the guarantee institution, such as whether the applicant's credit score reaches a certain standard, whether the guarantee amount is within the permitted range, and whether the contract complies with policy regulations. Obtaining the application condition verification result means that after the smart contract completes the verification, it will generate a result indicating whether the application meets the requirements to determine the subsequent processing steps.

[0033] If the application condition verification result is passed, multi-signature verification will be carried out, which means that if the verification result of the smart contract shows that the application information meets all the set conditions, the next step of the security verification process, namely multi-signature verification, will be entered. The verification result being passed indicates that the applicant has met all the necessary review requirements, and the integrity and compliance of the application information have been recognized. Multi-signature is a security mechanism that requires multiple authorizing parties to jointly sign to complete a transaction or approval. This mechanism can effectively prevent a single party from abusing its power and improve the security and reliability of the transaction. The verification process usually involves multiple guarantee institutions or regulatory parties, such as banks, insurance companies, and government regulatory agencies. Each party will use its private key to sign the application information. Only when all the designated signatories have completed the signing will the application be finally approved and enter the next process.

[0034] Furthermore, this application also includes: if the guarantee institution approves the application information, an electronic signature will be made and recorded through the blockchain timestamp.

[0035] Specifically, if the guarantee institution approves the application information, it means that the guarantee institution reviews the guarantee application submitted by the applicant and can enter the next process only after confirming that it meets all the necessary conditions. The guarantee institution is a bank, an insurance company, or a professional credit guarantee institution, which is responsible for evaluating the applicant's qualifications to ensure that its performance ability and credit level meet the requirements. The review process includes verifying the applicant's credit score, financial status, historical transaction records, and the legality of the contract to ensure that the risk of the guarantee is controllable. The application information includes key contents such as the application number, applicant name, guarantee amount, scope of liability, and beneficiary information. The accuracy and integrity of this information determine the legality and enforceability of the guarantee. Passing means that the review result shows that the applicant's qualifications meet the guarantee requirements, and the guarantee institution is willing to assume the corresponding guarantee liability and enter the next link where the guarantee comes into full effect.

[0036] Making an electronic signature means that after the guarantee institution approves, it will use a digital certificate to electronically sign the guarantee to ensure the authenticity and immutability of the guarantee. Electronic signature is a security technology based on cryptography that can generate a unique digital signature through the private key of the guarantee institution and bind it to the guarantee content to ensure that the guarantee has not been tampered with. Electronic signature is equivalent to stamping or signing in a traditional paper contract, but it is more secure and efficient and can be completed online and take effect immediately. The signing process relies on the public key for management, that is, each guarantee institution holds a unique private key, and only the guarantee signed with this private key is valid. In this way, even if someone tries to modify the guarantee content, a mismatch will be immediately detected during signature verification, thus ensuring the security of the guarantee.

[0037] With blockchain timestamp recording, it means that the guarantee letter after electronic signature will have its timestamp stored on the blockchain to ensure that its signing time is verifiable and tamper-proof. The blockchain timestamp is a time recording method based on blockchain technology. By writing the data hash value into the blockchain and attaching the time when this transaction is packed into a block, it ensures that the time attribute of the data cannot be changed. The recording is to deposit the key information and signing time of the guarantee letter into the blockchain, enabling any authorized party to verify the authenticity of the guarantee letter and the signing time at any time. Even if a dispute occurs in the future, all parties can consult the records on the blockchain to confirm the true state of the guarantee letter at a specific time point, avoiding legal disputes caused by tampering or forgery.

[0038] Furthermore, this application also includes: if the guarantee institution approves the application information, multi-party signature confirmation among the applicant, the guarantee institution, and the regulatory institution is carried out.

[0039] Specifically, if the guarantee institution approves the application information, it means that the guarantee institution reviews the guarantee letter application submitted by the applicant and can only enter the next signature confirmation process after confirming that it meets all guarantee requirements. The guarantee institution is usually a bank, an insurance company, or other financial institutions, which are responsible for evaluating the applicant's credit status, financial capabilities, and contract compliance to ensure the controllability of the guarantee liability. The review process includes checking the materials provided by the applicant, such as credit scores, financial statements, historical performance records, and contract content, to ensure that the application information is true and complete. The approval indicates that the applicant's conditions meet the standards of the guarantee institution, and the guarantee institution agrees to provide guarantee for it and enters the formal signing process.

[0040] Carrying out multi-party signature confirmation among the applicant, the guarantee institution, and the regulatory institution means that after the review is passed, multiple relevant parties need to jointly conduct digital signatures to ensure the authenticity and legal effect of the guarantee letter. The applicant is the party that submits the guarantee letter application, usually an enterprise or an individual, who is responsible for submitting application materials and accepting the review of the guarantee institution. The guarantee institution is the financial institution that provides the guarantee and is responsible for reviewing and ultimately bearing the guarantee liability. The regulatory institution is the government agency or industry association responsible for supervising the guarantee transaction, ensuring that the entire guarantee process complies with laws and regulations and preventing fraud. Multi-party signature is a security mechanism that requires multiple participating parties with different roles to jointly sign to ensure that no single party can tamper with the content of the guarantee letter alone, thereby improving the security and credibility of the transaction. Confirmation means that all relevant parties recognize the content of the guarantee letter through digital signatures and store the signature information on the blockchain for subsequent query and verification.

[0041] Furthermore, this application also includes: confirming the authorization information of the visitor; if the visitor is an authorized user, querying the electronic guarantee letter through a smart contract.

[0042] Specifically, confirming the authorization information for the visitor means that before accessing the electronic guarantee letter, it is necessary to verify the identity of the visitor and ensure that they have the corresponding permissions. The visitor refers to an individual or institution attempting to query the information of the electronic guarantee letter, which may include the beneficiary, regulatory agency, guarantee agency, or the applicant itself. The confirmation process involves identity authentication and permission verification to ensure that the visitor is a legally authorized entity. The authorization information refers to the proof of access rights possessed by the visitor, which may include digital certificates, public keys, blockchain accounts, or other identity credentials. The role of this process is to prevent unauthorized users from viewing sensitive data, protect the privacy and security of the electronic guarantee letter, and ensure that only users with legitimate permissions can access the relevant information.

[0043] If the visitor is an authorized user and queries the electronic guarantee letter through a smart contract, it means that after confirming that the identity of the visitor meets the authorization requirements, the query operation can be executed with the help of the smart contract. An authorized user refers to a visitor who has passed identity verification and has legitimate query permissions, such as the beneficiary of the guarantee letter or the relevant regulatory agency. A smart contract is an automated program deployed on the blockchain that can execute operations such as querying, verifying, or transacting when preset conditions are met. The query process refers to the smart contract retrieving the corresponding electronic guarantee letter data from the blockchain based on the identity and permissions of the visitor. An electronic guarantee letter refers to a digital guarantee letter stored on the blockchain, which contains key information such as the guaranteed amount, scope of liability, issuing agency, and validity period. Through this mechanism, the transparency and immutability of the data are ensured, and at the same time, the query process becomes more secure and efficient.

[0044] Furthermore, this application also includes: if the visitor is an authorized person, querying the complete information of the electronic guarantee letter through the smart contract; if the visitor is the beneficiary, conducting historical record tracking and confirming the authenticity of the electronic guarantee letter through hash verification and the smart contract.

[0045] Specifically, if the visitor is an authorized person and queries the complete information of the electronic guarantee letter through a smart contract, it means that after the identity of the visitor is verified as an authorized user, the entire content of the electronic guarantee letter can be obtained with the help of the smart contract on the blockchain. The visitor refers to an individual or institution attempting to query the electronic guarantee letter, while the authorized person refers to a specific user who has passed identity verification and has been granted query permissions, such as the applicant, guarantee agency, or regulatory agency. Querying refers to extracting the relevant information of the electronic guarantee letter from the data stored on the blockchain. The complete information includes the guarantee letter number, applicant name, guaranteed amount, scope of guarantee liability, guarantee period, guarantee agency information, and other necessary terms. A smart contract is an automated execution program based on the blockchain that can automatically complete data queries when conditions are met without manual intervention. This process ensures the transparency and credibility of the electronic guarantee letter and at the same time avoids problems such as information tampering or loss that may occur with traditional paper guarantee letters.

[0046] If the visitor is the beneficiary, historical record tracking and authenticity confirmation of the electronic guarantee letter are carried out through hash verification and smart contracts, which means that when the visitor is the beneficiary of the electronic guarantee letter, not only can the complete content of the guarantee letter be queried, but also the true validity of the guarantee letter can be verified. The beneficiary refers to the party that enjoys rights after the guarantee letter comes into effect, usually the other party of the transaction contract, such as the first party of the engineering project or the owner of the tenderer. Historical record tracking means that the beneficiary can view all change records of the electronic guarantee letter, such as when it was issued, whether the terms have been modified, whether there have been performance requirements, and whether there has been fund disbursement. Hash verification refers to using blockchain technology to verify the deposit information of the electronic guarantee letter. The hash value is a kind of encrypted digest. Each electronic guarantee letter will calculate a unique hash value when it is generated. Any tampering will cause the hash value to change. Therefore, it can be judged whether the guarantee letter has been tampered with through hash verification. The role of the smart contract is to automatically execute relevant logic during the verification process, such as comparing the current guarantee letter hash value with the original deposit hash value, or querying the deposit data on the blockchain to ensure that the guarantee letter is still valid and has not been tampered with.

[0047] Furthermore, this application also includes: using a smart contract to read the performance situation in the on-chain evidence provided by the beneficiary, and judging whether the disbursement condition is met based on the electronic guarantee letter; if the disbursement condition is met, triggering disbursement, the guarantee institution starts the claims settlement process, and uploads the disbursement result to the chain.

[0048] Specifically, using a smart contract to read the performance situation in the on-chain evidence provided by the beneficiary means that the smart contract will evaluate the performance situation according to the evidence information provided by the beneficiary on the blockchain. The beneficiary refers to the party that enjoys benefits after the guarantee letter comes into effect, usually the other party of the contract, such as the first party or the project party. The performance situation refers to whether the applicant has fulfilled the agreed responsibilities and obligations according to the contract. On-chain evidence refers to the data related to the performance situation stored on the blockchain, such as the project progress, quality acceptance records, etc. As an automatically executed program, the smart contract can read this data stored on the blockchain and judge whether the performance situation meets the disbursement condition according to the preset logic. For example, if the guarantee letter is to ensure the completion of a construction project on time, and the project progress data shows that the project is delayed, the smart contract will judge that the performance has not been completed and the disbursement cannot be triggered.

[0049] Judging whether the redemption conditions are met based on the electronic guarantee means that the smart contract decides whether to meet the conditions for executing the redemption according to the terms and conditions stipulated in the electronic guarantee. The electronic guarantee usually clearly stipulates that under specific circumstances, the beneficiary can request redemption, such as contract default, project schedule delay, or other default behaviors. The smart contract will compare the terms in the electronic guarantee with the on-chain evidence provided by the beneficiary to determine whether these conditions are met. If the smart contract determines that the conditions are met, the redemption process will be automatically triggered to ensure that the beneficiary obtains compensation.

[0050] If the redemption conditions are met, the redemption is triggered and the guarantee institution starts the claims settlement process, which means that after the smart contract confirms that the redemption conditions are met, the redemption process will be automatically started. Redemption refers to the guarantee institution paying the corresponding amount to the beneficiary, usually a part or all of the guarantee amount. The guarantee institution refers to the institution providing guarantee services, such as banks or insurance companies. The claims settlement process refers to the procedure by which the guarantee institution pays compensation to the beneficiary according to the contract and terms, ensuring that the flow of funds meets the agreed requirements. The claims settlement process includes links such as fund review, confirmation of the payment object, and payment amount, ensuring that all operations are legal, transparent, and timely. Finally, the redemption result will be recorded on the blockchain as a permanent and tamper-proof record, ensuring that both parties and regulatory authorities can query and verify this result at any time.

[0051] Furthermore, this application also includes: tracing the flow of the electronic guarantee throughout the process by the regulatory authority and monitoring abnormal issuance and frequent redemption; freezing the electronic guarantee and revoking the issuance based on the monitored abnormalities.

[0052] Specifically, tracing the flow of the electronic guarantee throughout the process by the regulatory authority means that the regulatory authority can comprehensively monitor the operations of each link of the electronic guarantee from application to issuance and redemption. The electronic guarantee is a digital guarantee tool that records all key information of the guarantee, such as the guarantee amount, beneficiary, guarantee liability, etc. The entire process includes steps such as application, review, issuance, evidence preservation, and redemption. Tracing the whole process means that the regulatory authority can track the detailed information of each transaction and ensure the transparency and immutability of this information through blockchain technology. The regulatory authority can check at any time whether the guarantee flows according to the regulations, preventing illegal or irregular operations, such as the issuance of an un-reviewed guarantee or unclear fund flow. The flow usually refers to the process of the electronic guarantee flowing between different entities, including the process from the guarantee institution to the beneficiary, as well as the performance or redemption link of the guarantee.

[0053] Monitoring abnormal issuance and frequent redemption means that regulatory agencies will focus on those abnormal guarantee letter issuance behaviors and frequent redemption requests. Abnormal issuance refers to the situation where a guarantee letter is issued without conforming to the normal approval procedures or under unreasonable circumstances, such as a guarantee letter applied for through false evidence or incomplete information. Frequent redemption means that a guarantee letter has been redeemed multiple times within a short period, which may indicate potential risks or abnormal behaviors. By monitoring these abnormal behaviors, regulatory agencies can detect risks in a timely manner and intervene to avoid damaging the stability of the financial system or large-scale fraud incidents.

[0054] Freezing electronic guarantee letters and revoking issuance based on monitoring abnormalities means that when regulatory agencies detect abnormal behaviors through monitoring, they can take measures to freeze electronic guarantee letters and revoke the issuance of guarantee letters. Freezing refers to temporarily suspending the operation of an electronic guarantee letter to prevent it from continuing to circulate or be executed. Revoking issuance means that if an electronic guarantee letter is issued without going through a legal process or there is fraud, the regulatory agency can withdraw the previous issuance decision to ensure that the guarantee letter no longer has legal effect. The purpose of freezing and revoking is to protect the interests of beneficiaries and guarantee agencies and avoid financial losses or improper transactions caused by abnormal behaviors.

[0055] In summary, the blockchain-based full-process security verification method for guarantee letters provided in this application has the following technical effects: by implementing an intelligent and automated redemption and performance monitoring system, it achieves the technical effects of improving the accuracy, efficiency, and transparency of the redemption process, ensuring that smart contracts can be correctly executed in complex scenarios, and thus enhancing the reliability and trust of electronic guarantee letters.

[0056] Embodiment 2, based on the same inventive concept as the blockchain-based full-process security verification method for guarantee letters in the foregoing embodiment, this application also provides a blockchain-based full-process security verification system for guarantee letters. Please refer to the appendix Figure 2 , including: an application module 11, which is used to store the application information of the guarantee letter application on the blockchain; an issuance module 12, which is used to review the application information to issue an electronic guarantee letter and perform query verification on the electronic guarantee letter; a redemption module 13, which is used to perform redemption performance verification based on the electronic guarantee letter to execute redemption; and a supervision module 14, which is used to supervise the execution of redemption and perform audit verification.

[0057] Furthermore, the blockchain-based full-process security verification system for guarantee letters is also used for: storing the application information on the blockchain based on the guarantee letter application submitted by the applicant to the guarantee agency; authenticating the applicant's identity based on blockchain; and if the applicant's identity authentication passes, performing hash storage on the application information.

[0058] Further, the blockchain-based full-process security verification system for guarantee letters is also used to: verify the application conditions of the application information through a smart contract in the blockchain to obtain an application condition verification result; if the application condition verification result is passed, multi-signature verification will be performed.

[0059] Further, the blockchain-based full-process security verification system for guarantee letters is also used to: if the guarantee institution approves the application information, perform an electronic signature and record it through the blockchain timestamp.

[0060] Further, the blockchain-based full-process security verification system for guarantee letters is also used to: if the guarantee institution approves the application information, perform multi-signature confirmation among the applicant, the guarantee institution, and the regulatory institution.

[0061] Further, the blockchain-based full-process security verification system for guarantee letters is also used to: confirm the authorization information for the visitor; if the visitor is an authorized user, query the electronic guarantee letter through the smart contract.

[0062] Further, the blockchain-based full-process security verification system for guarantee letters is also used to: if the visitor is an authorized person, query the complete information of the electronic guarantee letter through the smart contract; if the visitor is a beneficiary, conduct historical record tracking and confirm the authenticity of the electronic guarantee letter through hash verification and the smart contract.

[0063] Further, the blockchain-based full-process security verification system for guarantee letters is also used to: read the performance status in the on-chain evidence provided by the beneficiary through the smart contract, and judge whether the redemption conditions are met based on the electronic guarantee letter; if the redemption conditions are met, trigger the redemption, the guarantee institution starts the claims settlement process, and uploads the redemption result to the chain.

[0064] Further, the blockchain-based full-process security verification system for guarantee letters is also used to: trace the flow of the electronic guarantee letter throughout the process by the regulatory institution, and monitor abnormal issuance and frequent redemption; freeze the electronic guarantee letter and revoke the issuance based on the monitored anomalies.

[0065] The various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The blockchain-based full-process security verification method and specific examples in the foregoing Embodiment 1 are equally applicable to the blockchain-based full-process security verification system in this embodiment. Through the foregoing detailed description of the blockchain-based full-process security verification method, those skilled in the art can clearly know the blockchain-based full-process security verification system in this embodiment. Therefore, for the sake of brevity of the specification, it will not be elaborated here.

[0066] The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but rather to the broadest scope consistent with the principles and novel features disclosed herein.

[0067] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the present application and its equivalent technologies, the present application is also intended to include these changes and modifications.

Claims

1. A method for secure verification of the entire process of a guarantee letter based on blockchain, characterized in that, Including: Storing and uploading the application information of the guarantee letter application to the blockchain; Reviewing the application information to issue an electronic guarantee letter, and querying and verifying the electronic guarantee letter; Performing payment performance verification based on the electronic guarantee letter to execute payment; Supervising the payment execution and conducting audit verification.

2. The method for secure verification of the whole process of a guarantee letter based on blockchain according to claim 1, characterized in that, Storing and uploading the application information of the guarantee letter application, including: Uploading the application information with the guarantee letter application submitted by the applicant to the guarantee institution; Authenticating the applicant's identity based on blockchain identity; If the applicant's identity authentication is passed, performing hash storage of the application information.

3. The method for secure verification of the whole process of a guarantee letter based on blockchain according to claim 1, wherein, Reviewing the application information, including: Verifying the application conditions of the application information with the smart contract in the blockchain to obtain the application condition verification result; If the application condition verification result is passed, multiple signature verification will be performed.

4. The method for secure verification of the whole process of a guarantee letter based on blockchain according to claim 3, wherein, Performing multiple signature verification, including: If the guarantee institution reviews the application information and passes it, performing electronic signature and recording it through the blockchain timestamp.

5. The method for secure verification of the entire process of a guarantee letter based on blockchain according to claim 3, wherein, Performing multiple signature verification also includes: If the guarantee institution reviews the application information and passes it, performing multi-party signature confirmation among the applicant, the guarantee institution, and the regulatory institution.

6. The method for secure verification of the whole process of a guarantee letter based on blockchain according to claim 1, characterized in that Performing query and verification of the electronic guarantee letter, including: Confirming the authorization information for the visitor; If the visitor is an authorized user, querying the electronic guarantee letter through the smart contract.

7. The method for full-process security verification of a guarantee letter based on blockchain according to claim 6, characterized in that, If the visitor is an authorized user, querying the electronic guarantee letter through the smart contract, including: If the visitor is the authorizer, querying the complete information of the electronic guarantee letter through the smart contract; If the visitor is the beneficiary, conducting historical record tracking and confirming the authenticity of the electronic guarantee letter through hash verification and the smart contract.

8. The method for secure verification of the entire process of a letter of guarantee based on blockchain according to claim 1, wherein Performing payment performance verification based on the electronic guarantee letter to execute payment, including: Reading the performance situation in the on-chain evidence provided by the beneficiary with the smart contract, and judging whether the payment conditions are met based on the electronic guarantee letter; If the payment conditions are met, triggering payment, and the guarantee institution starts the claim settlement process and uploads the payment result to the blockchain.

9. The method for secure verification of the whole process of a guarantee letter based on blockchain according to claim 1, characterized in that, Supervising the payment execution and conducting audit verification, including: Tracing the whole process of the electronic guarantee letter by the regulatory institution, and monitoring abnormal issuance and frequent payment; Freezing the electronic guarantee letter and revoking the issuance based on the monitored abnormality.

10. A blockchain-based full-process security verification system for guarantee letters, characterized in that, Steps for implementing the blockchain-based full-process security verification method of the guarantee letter described in any one of claims 1 to 9, including: An application module, which is used to store and upload the application information of the guarantee letter application; An issuance module, which is used to review the application information to issue an electronic guarantee letter, and query and verify the electronic guarantee letter; A payment module, which is used to perform payment performance verification based on the electronic guarantee letter to execute payment; A supervision module, which is used to supervise the payment execution and conduct audit verification.

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