CN115065480A - Electronic contract system and signing method based on block chain certificate storage - Google Patents

Abstract

The invention provides an electronic contract system and a signing method based on block chain evidence storage. The method comprises the following steps: a sender uploads a contract or selects a contract template through an electronic contract system, then uses a digital certificate issued by an authoritative CA organization to digitally sign the contract, and then adds a national authorization timestamp service in the contract; sending the electronic contract to a signing end, and receiving the electronic contract returned by the contract signing end, wherein the electronic contract comprises a signing time timestamp and an electronic seal of an electronic contract signing party; and setting signing parties and sequences according to the electronic contract sender, and receiving all the electronic contracts returned by the signing parties and the final electronic signatures to finish signing. The electronic contract platform records all node information in the contract signing process of the user and stores the node information in the private block chain certificate storage platform; the invention not only ensures the integrity and non-tampering of the contract, but also records and stores all the flow information signed by the contract, and can restore the full-flow integral evidence link signed by the user contract.

Description

A blockchain-based electronic contract system and signing method

technical field

The invention relates to the technical fields of electronic contracts and blockchain certificate storage, and in particular to an electronic contract system and signing method based on blockchain certificate storage. sign the act.

Background technique

With the development of modern digital technology, the traditional method of contract signing brings very cumbersome and low-efficiency troubles. Both parties sign the paper contract through the presence of both parties or by mail by one party. The whole process of signing is long and costly. The electronic contract platform migrates the traditional signing process to the Internet, which is low-cost, efficient and has the same legal effect.

The electronic contract platform confirms the real identity of the network by allowing the user's real-name authentication (face recognition, SMS authentication, video biopsy and other technical implementation methods), and uses the SHA256 hash algorithm to encrypt the original contract to obtain a digital abstract, and then use the state-authorized CA (CA). , that is, the digital certificate issued by the Certificate Authority) digitally signs the contract, and then adds the trusted time stamp authorized by the country at the time of signing to record the time of signing the contract, which has the same legal effect. The signer verifies the original contract, the digital signature and the public key of the sender's digital certificate sent by the sender, and finally determines the integrity of the contract and whether it has been tampered with by comparing the digital digest of the contract. And realize that the information of each node in the process of storing and signing is stored in the blockchain certificate storage platform, providing users to view and download the complete signing behavior evidence chain at any time. The integrity, anti-counterfeiting, and security of the contract are guaranteed by the fixed-line file + encryption + blockchain technology, which makes the electronic contract data more secure and reliable, and can also guarantee the proof effectiveness of the electronic data.

SUMMARY OF THE INVENTION

The purpose of the present invention is to solve the shortcomings in the prior art, and proposes a blockchain-based electronic contract system and signing method, which migrates the offline traditional signing process to the Internet, greatly reducing the cost of Signing costs and improving signing efficiency; using encryption technology algorithms and real-name authentication to confirm the real identity of the network and other technical means to make the signing behavior of electronic contracts safe and reliable; based on blockchain certificate storage technology to ensure all signing behaviors on the blockchain The information cannot be tampered with; and all the signing behaviors in the entire signing process are put on the chain, providing users with a chain of evidence for viewing and downloading the signing behavior information at any time;

In order to achieve the above object, the present invention adopts the following technical solutions:

An electronic contract system and signing method based on blockchain certificate storage, the implementation steps are as follows:

S1. The sender user uploads the contract through the electronic contract system platform or uses the built-in contract template of the system, and uses the digital certificate issued by the authoritative CA agency to digitally sign the contract;

S2, adding the digital signature of the electronic contract to the national authorization timestamp at the time of signing;

S3. Send the electronic contract to the contract signing terminal, and receive the electronic contract returned by the contract signing terminal, which includes the national authorization timestamp at the time of signing and the electronic seal of the signer;

S4. Set the signatories and order according to the sender of the electronic contract, and receive the return of the electronic contract and the final electronic signature from all signatories, and complete the signing;

Preferably, the digital signature based on the sender's electronic contract specifically includes:

Electronic contract system registration and login;

The user conducts real-name authentication, including face recognition, SMS authentication, video biopsy and other authentication methods;

The user applies for a digital certificate from a nationally authorized CA agency, including: certificate serial number,

Certificate issuer, certificate validity start time, certificate validity end time;

The original electronic contract first generates a digital digest through SHA256 hash, and then uses the applied digital certificate asymmetric encryption (RSA) to generate a digital signature;

Preferably, a national authorization time stamp is added to the digital signature of the electronic contract at the time of signing.

Preferably, after the sender sends the electronic contract to the signing terminal, it specifically includes:

The signer receives the original contract, the digital signature of the electronic contract and the public key of the signer's digital certificate initiated by the sender;

The signing end verifies the sender's data, and finally compares whether the digital digest (SHA256) of the electronic contract is the same by verifying the algorithm rules, and verifies the integrity of the contract and whether it has been tampered with;

After verification by the signer, repeat steps S1 to S3 to sign and send the original contract;

Preferably, the steps S1-S4 include: encrypting and recording all the node information in the process of signing the contract by the user on the electronic contract platform using the user's private key, and finally storing it on the private blockchain certificate deposit platform. View and download the complete chain of evidence information of the complete signing behavior.

Compared with the prior art, the present invention has the following beneficial effects:

1. The electronic contract system and signing method based on blockchain certificate storage proposed by the present invention enables the parties to sign an electronic contract online, converts the original offline business process online, reduces the coordination time of offline contracting parties, and improves information Delivery and contract signing efficiency. The electronic contract platform confirms the real identity of the network by allowing the user's real-name authentication (face recognition, SMS authentication, video biopsy and other technical implementation methods), and uses the SHA256 hash algorithm to encrypt the original contract to obtain a digital abstract, and then use the state-authorized CA (CA). , that is, the digital certificate issued by the Certificate Authority) digitally signs the contract, and then adds the trusted time stamp authorized by the country at the time of signing to record the time of signing the contract, which has the same legal effect. The signer verifies the original contract, the digital signature and the public key of the sender's digital certificate sent by the sender, and finally determines the integrity of the contract and whether it has been tampered with by comparing the digital digest of the contract. Realize a safe and reliable electronic contract signing process, and complete contract signing anytime, anywhere.

2. The electronic contract system and signing method based on blockchain certificate storage proposed by the present invention utilizes the irreversible and tamper-resistant characteristics of the blockchain to store all the signing behavior information in the entire signing process in the blockchain storage certificate. In the certificate platform, users can view and download the complete chain of signature behavior evidence at any time. The integrity, anti-counterfeiting, and security of the contract are guaranteed by the fixed-line file + encryption + blockchain technology, which makes the electronic contract data more secure and reliable, and can also guarantee the proof effectiveness of the electronic data.

Description of drawings

1 is a schematic flowchart of a blockchain-based electronic contract system and signing method proposed by the present invention;

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described implementation regulations are only a part of the embodiments of the present invention, rather than all the embodiments.

In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inside", " The orientation or positional relationship indicated by "outside" is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, so as to The specific orientation configuration and operation are therefore not to be construed as limitations of the present invention.

Please refer to FIG. 1, which shows a blockchain-based electronic contract system and signing method provided by an embodiment of the present invention. The specific operation method is as follows:

S1. The sender user uploads the contract through the electronic contract system platform or uses the built-in contract template of the system, and uses the digital certificate issued by the authoritative CA agency to sign the contract;

It should be noted that the sender also needs to include specific steps before sending the contract:

Individuals or enterprises register and log in through the electronic contract system; users perform real-name authentication, including face recognition, SMS authentication, video biopsy and other authentication methods; users apply for digital certificates from state-authorized CA institutions, including: certificate serial number, certificate issuer , the start time of the validity period of the certificate, the end time of the validity period of the certificate and other information; the original electronic contract first generates a digital digest through the SHA256 hash algorithm, and then uses the digital certificate private key asymmetric encryption (RSA) applied by the user to generate a digital signature; The contract is digitally signed before the contract to ensure the tamper-proof, integrity and security of the contract.

S2. Add the digital signature of the electronic contract to the state-authorized time stamp at the time of signing; it should be noted that the state-authorized time stamp of the time of signing is added to the electronic contract, and the digital signature generated by the electronic contract is corresponding to the time stamp service in the previous step. Encrypt the digital signature and the current time with the private key of . The times in the stamps are different. Realize the locking of the contract to further strengthen the tamper-proof of the contract.

S3. Send the electronic contract to the contract signing terminal, and receive the electronic contract returned by the contract signing terminal, which includes the national authorization timestamp at the time of signing and the electronic seal of the signer;

It should be noted that before the signing end signs the electronic contract sent by the sender, the contract data needs to be verified, including: the signing end receives the original contract initiated by the sender, the digital signature of the electronic contract, and the public key of the signer's digital certificate. ; The signing end verifies the sender's data, and finally compares the digital digest (SHA256) of the electronic contract through the verification algorithm rules to verify the integrity of the contract and whether it has been tampered with; after the signing end verifies, repeat steps S1 to S3 to sign the original contract. Chapter sent.

S4. Set the signatories and order according to the sender of the electronic contract, and receive the return of the electronic contract and the final electronic signature from all signatories, and complete the signing;

It should be noted that when the number of contract signatories is multiple, the electronic contract needs to be sent to the contract signing terminal corresponding to the first contract signatory, and after receiving the returned electronic contract, the electronic contract should be sent to The contract signing terminal corresponding to the second contract signer, until all contract signing terminals receive the electronic contract and return the electronic contract.

Specifically, all the node information in the process of signing the contract by the above-mentioned users on the electronic contract platform is encrypted and recorded with the user's private key, and finally stored in the private blockchain certificate storage platform. The user can view and download the complete evidence of the complete signing behavior at any time. chain information.

The encryption methods of the digital digest, digital signature, and time stamp in the embodiment of the present invention are expressed as follows:

Digital Summary=SHA256(document);

Digital Sign=RSA Encrypt(Digital Summary)+Certificate

Final Sign=TSA(Digital Sign+CurrentTime)

The verification and decryption methods of the digital digest, digital signature, and time stamp in the embodiment of the present invention are expressed as follows:

Digital Sign=TSA(Final Sign)

Digital Summary=RSA Dncrypt(Digital Sign)+Certificate

Among them, Digital Summary: digital summary, Digital Sign: digital signature, Certificate: digital certificate (including the private key and public key of the user or enterprise), TSA: National Authorization Timestamp Service, CurrentTime: signing time (accurate to seconds), Final Sign: The final digital signature. By utilizing the encryption algorithm, the decryption algorithm and the verification method of the authorized agency, the electronic contract can fully guarantee the integrity, security and tamper-proof modification of the electronic contract during the transmission process.

The above description is only a preferred embodiment of the present invention, but the protection scope of the present invention is not limited to this. The equivalent replacement or change of the inventive concept thereof shall be included within the protection scope of the present invention.

Claims (5)

1. An electronic contract system and a signing method based on block chain certificate storage are characterized by comprising the following steps:

s1, the sender user uploads the contract through the electronic contract system platform or uses a system built-in contract template, and signs the contract by using a digital certificate issued by an authoritative CA mechanism;

s2, adding the digital signature of the electronic contract into a national authorization timestamp at the signing time;

s3, sending the electronic contract to a contract signing terminal, and receiving the electronic contract returned by the contract signing terminal, wherein the electronic contract comprises a national authorization timestamp at the signing time and an electronic seal of a signing party;

s4, according to the electronic contract sender, setting signing parties and sequence, receiving all signing parties to return the electronic contract and final electronic signature, and completing signing.

2. The block chaining evidence based electronic contract system and signing method as claimed in claim 1, wherein step S1 comprises:

s101: registering and logging in an electronic contract system;

s102: the user performs real-name authentication, including authentication modes such as face recognition, short message authentication, video biopsy and the like;

s103: the user applies for a digital certificate from a national authorized CA authority, comprising: a certificate serial number, a certificate issuer, a certificate validity period start time, and a certificate validity period end time;

s104: the electronic contract is first hashed by SHA256 to generate a digital digest, and then an applied digital certificate asymmetric encryption (RSA) is used to generate a digital signature.

3. The block chaining evidence based electronic contract system and signing method of claim 1, wherein: and adding a digital signature generated by the electronic contract into a national authorization timestamp at the signing time, and recording the contract time at the signing time.

4. The block chaining evidence based electronic contract system and signing method as claimed in claim 1, wherein step S3 comprises:

s301: the signing end receives and sends contract originals, electronic contract digital signatures and signing party digital certificate public keys initiated by a sending party.

S302: and the signing end verifies the data of the sender, finally compares whether the digital digests (SHA256) of the electronic contract are the same or not through a verification algorithm rule, and verifies the integrity of the contract and whether the contract is tampered or not.

S303: and after the signing end verifies, repeating the steps from S1 to S3 to carry out signature transmission on the contract original.

5. The block chaining evidence based electronic contract system and signing method of claim 1, wherein: from the steps S1 to S4, all node information of the user in the contract signing process of the electronic contract platform is recorded by using the private key of the user in an encryption mode and finally stored in the private block chain evidence storage platform, and the user can check and download the complete evidence chain information of the complete signing behavior at any time.

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