CN108537046A - A kind of online contract signature system and method based on block chain technology - Google Patents
A kind of online contract signature system and method based on block chain technology Download PDFInfo
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- CN108537046A CN108537046A CN201710128783.5A CN201710128783A CN108537046A CN 108537046 A CN108537046 A CN 108537046A CN 201710128783 A CN201710128783 A CN 201710128783A CN 108537046 A CN108537046 A CN 108537046A
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Abstract
The present invention provides a kind of online contract signature system and method based on block chain technology, including：Contract initiator's login system；Create electronic contract；Encryption distribution, is distributed to the client of each contract signatory after being encrypted for client network engine；Related contract signatory decrypts treaty content and checks；Select signature mode；Encryption distribution；Non- contract signature related side stores encryption contract secret key, and anonymous encryption that can be on synchronizing network after being logged in for each client not can recognize that contract dataset.The present invention takes the strategy of decentralization completely, every operation is all carried out in localization, leaking data is avoided to third-party possibility, contract dataset takes anonymous encryption policy simultaneously, non- contract signature related side's client cannot identify encrypted data content, the operation for distorting agreement any in this way will have to distort all clients in the whole world, and the data that can operate other clients are had permission without any client, have thoroughly prevented the possibility distorted.
Description
Technical field
The present invention is based on the inventive technique necks that can be applied to the various types of contracts of on-line signing of block chain technological development
Domain, and in particular to a kind of online contract signature system and method based on block chain technology.
Background technology
The office cost, logistics transportation cost and the time cost electronic contract that bring are signed in order to solve papery contract
Technology has been developed that large quantities of electronic contract signature platforms under the premise of being developed rapidly with computer technology.
Country's implementation in 1 day October in 1999《Contract law》Article 11 regulation " refers to contract, letter in writing form
Part and electronic message etc. can be tangible the contained content of performance form ".This be China's law define electronic message for the first time can
Using as in writing form with the signing with contract.
The tenth meeting of 2004 Nian8Yue28 the Tenth National People's Congress standing committees passes through《Electronics label
Name method》This has established Fundamentals of Law for e-commerce from the development in an all-round way in China.
It is as follows currently based on the contract signature method of electronic signature technology：
After enterprise is by certification, electronic contract can be uploaded, then setting signature stamping permission and signing flow, and be sent out by mail
It send.After getting the mail, signing enterprise can complete contract by way of adding signature, stamping picture.For C-terminal user, monarch
Son label provide real-name authentication, short message, 7 kinds of authentication modes such as bank card, and user, can be directly by the system page, short without registration
The hand-written signings of modes such as letter link.
This method on the contract theory of signature because have the possibility being tampered, the contract signature based on block chain technology
Method is come into being.
Contract signature method major technique based on block chain is as follows：
By block chain technology, treaty content, the digital signature of user, signing temporal calculation are gone out into a numerical value with algorithm, then
The numerical value of itself and all contract dataset calculatings on platform is bound together, generates a new value as contract preservation information.
Since the value that the different particulars of a contract, contractor, time generate is unique, so if to distort contract information it is necessary to more
Level off treaty content all on platform.
Save from damage information generate after, gentleman sign recycle distributed storage technology, by data synchronous driving to save from damage center,
Judicial expertise center and notarial office, while providing judicial expertise certificate, notarization online.In transmission process, since operation is adopted
Hash algorithm is irreversible, so even if information leakage other people if counter can not release the particular content of contract.
Current all block chain contracts signature technology is all based on third-party server to carry out, and signs mode
Using third-party server at all as technological cores such as decentralization, anonymization, the dispersion storages for, not embodying block chain.
Be transmitted to after contract is signed the fairness that saves center, judicial expertise center and notarial office from damage no doubt and authoritative can bring contract and
Legitimacy, but the server for being theoretically likely to occur three mechanisms is led to the possibility of corrupted data by attack.Block chain
Core be in decentralization rather than multicenter.
Invention content
The purpose of the present invention is to provide a kind of online contract signature systems and method based on block chain technology, to solve
The problems mentioned above in the background art.
To achieve the goals above, the present invention is to realize by the following technical solutions：One kind being based on block chain technology
Online contract signature system and method, including：
Contract initiator's login system logs in one's own FTP client FTP for contract initiator；
Electronic contract is created, initiator writes contract for contract；
Encryption distribution, is distributed to the client of each contract signatory after being encrypted for client network engine；
Related contract signatory decrypts treaty content and checks, the client for contract signatory is signed in the contract that receives asks
After asking, decrypts encrypted treaty content and check；
Signature mode is selected, in the client selection hand-written electric signature of oneself or business-electronic is called for contract signatory
Stamping system, which is affixed one's seal, is used as signature mode；
Encryption distribution, installation is propagated to for contract related side by the net distribution engine of local client in a manner of encrypted
All clients of the software；
Non- contract signature related side stores encryption contract secret key, anonymity that can be on synchronizing network after being logged in for each client
Encryption not can recognize that contract dataset.
Further, the establishment electronic contract further includes obtaining national time service centre time stamp, for the system and country
The timestamp at time service center is linked.
A kind of online contract signature system and method, this method based on block chain technology are as follows：
Step A, first contract initiator log in one's own FTP client FTP, the timestamp of the system and national time service center
It is linked；
Wherein user inputs the included verification technique of account, password or calling mobile phone such as：Fingerprint identification module, iris recognition
Deng using the technology login system based on OAuth2.0 agreements.Subsequent system calls http automatically://www.ntsc.ac.cn
（It is at present the website at national time service center）, the current website time can be obtained after establishing URL connections；
Step B writes treaty content by contract initiator and is capped timestamp, hand-written electric signature or calling business-electronic stamping
After system is affixed one's seal, electronic contract is generated；
Wherein contract initiator creates a contract in client, and after having filled in relevant parameter, system calls national time service center
Timestamp, be written contract.Contract initiator signs a contract, generates electronic contract.
The technology wherein signed a contract is embodied as：
1）Contract initiator selects hand-written signature, then the signature of finger writing oneself can be used on mobile phone screen；
2）If contract initiator selects business-electronic stamped signature, then business-electronic signature blocks, every enterprise is called to have oneself
U-shield or the electronic module for signing mane of oneself, calling can then start after the module to authorize stamping, and business-electronic stamped signature number is written
According to；
3）Contract initiator selects voice and video signature, then can calling mobile phone or computer video record module, camera pair
Quasi contract initiator, records one section of 3 seconds video, and contract initiator is indicated oneself to endorsed this conjunction with daily utterance
Together；
Step C is distributed to the client terminal of each contract signatory after being encrypted by client network engine.
Contract wherein after contract initiator signature can be by irreversible Encryption Algorithm（It is defaulted as SHA-512）After encryption,
It is transferred to the client terminal of all contract signatories first closed（Can be mobile phone or computer user）；
If if contract signatory does not register the system, contract initiator need to fill in contract signatory email address or
Cell-phone number, with latter mail, either short message can be sent on the mailbox or mobile phone of related signatory；
The client of step D, contract signatory decrypt encrypted treaty content, and give after receiving contract signature request
To be presented in the terminals such as computer, mobile phone, tablet computer；
If if wherein having contract signatory not register the system, contract signature can be received on mailbox or short message
Message request the contract list to be signed can then occur, if to contract automatically after the cell-phone number or mailbox ID Accreditation System
Content then enters step E without dispute, and refusal can be selected to sign if disputable to contract；
Step E, contract signatory sign a contract in the client of oneself, hand-written electric signature or calling business-electronic stamping system
After system is affixed one's seal, generates electronics and come into force an edition contract.
After wherein contract signatory has filled in relevant parameter, on-line signing contract；
The technology signed a contract is embodied as：
1）Contract signatory selects hand-written signature, then the signature of finger writing oneself can be used on mobile phone screen；
2）If contract signatory selects business-electronic stamped signature, then business-electronic signature blocks, every enterprise is called to have oneself
U-shield or the electronic module for signing mane of oneself, calling can then start after the module to authorize stamping, and business-electronic stamped signature number is written
According to；
3）Contract signatory selects voice and video signature, then can calling mobile phone or computer video record module, camera pair
Quasi contract initiator, records one section of 3 seconds video, and contract initiator is indicated oneself to endorsed this conjunction with daily utterance
Together；
Step F, after contract signature comes into force, contract related side is passed by the net distribution engine of local client in a manner of encrypted
All client blocks for installing the software additional are cast to as archive；
Contract wherein after contract signatory signature can be by irreversible Encryption Algorithm（It is defaulted as SHA-512）It is encrypted secret
Key is transferred to the client terminal of all registration users（Can be mobile phone or computer user）It is stored；
Step G：Each client can be on synchronizing network after logging in anonymous encryption not can recognize that contract dataset, and be distributed to
Other clients, until whole client block preserves the not recognizable encryption data of the anonymity；
After wherein each client logs in, the request of synchrodata can be automatically sent to neighbouring client, if there is new number
According to appearing in client nearby, then system starts all electronic contract data of automatic synchronization, until not new data go out
Until existing.
Beneficial effects of the present invention：The technical solution takes the strategy of decentralization completely, and every operation is all in local
Change and carry out, avoids leaking data to third-party possibility, while contract dataset takes anonymous encryption policy, non-contract signature
Related side's client cannot identify encrypted data content.The operation for distorting agreement any in this way will have to distort global all
Client, the data that can operate other clients are had permission without any client, have thoroughly prevented the possibility distorted
Property.
Description of the drawings
Fig. 1 is present system structural schematic diagram；
Fig. 2 is inventive network topological diagram；
Fig. 3 is the Organization Chart of present system.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
- 3 are please referred to Fig.1, the present invention provides a kind of technical solution：
A kind of online contract signature system and method based on block chain technology, including：
Contract initiator's login system logs in one's own FTP client FTP for contract initiator；
Electronic contract is created, initiator writes contract for contract；
Encryption distribution, is distributed to the client of each contract signatory after being encrypted for client network engine；
Related contract signatory decrypts treaty content and checks, the client for contract signatory is signed in the contract that receives asks
After asking, decrypts encrypted treaty content and check；
Signature mode is selected, in the client selection hand-written electric signature of oneself or business-electronic is called for contract signatory
Stamping system, which is affixed one's seal, is used as signature mode；
Encryption distribution, installation is propagated to for contract related side by the net distribution engine of local client in a manner of encrypted
All clients of the software；
Non- contract signature related side stores encryption contract secret key, anonymity that can be on synchronizing network after being logged in for each client
Encryption not can recognize that contract dataset.
Further, the establishment electronic contract further includes obtaining national time service centre time stamp, for the system and country
The timestamp at time service center is linked.
A kind of online contract signature system and method, this method based on block chain technology are as follows：
Step A, first contract initiator log in one's own FTP client FTP, the timestamp of the system and national time service center
It is linked；
Wherein user inputs the included verification technique of account, password or calling mobile phone such as：Fingerprint identification module, iris recognition
Deng using the technology login system based on OAuth2.0 agreements.Subsequent system calls http automatically://www.ntsc.ac.cn
（It is at present the website at national time service center）, the current website time can be obtained after establishing URL connections；
Step B writes treaty content by contract initiator and is capped timestamp, hand-written electric signature or calling business-electronic stamping
After system is affixed one's seal, electronic contract is generated；
Wherein contract initiator creates a contract in client, and after having filled in relevant parameter, system calls national time service center
Timestamp, be written contract.Contract initiator signs a contract, generates electronic contract.
The technology wherein signed a contract is embodied as：
1）Contract initiator selects hand-written signature, then the signature of finger writing oneself can be used on mobile phone screen；
2）If contract initiator selects business-electronic stamped signature, then business-electronic signature blocks, every enterprise is called to have oneself
U-shield or the electronic module for signing mane of oneself, calling can then start after the module to authorize stamping, and business-electronic stamped signature number is written
According to；
3）Contract initiator selects voice and video signature, then can calling mobile phone or computer video record module, camera pair
Quasi contract initiator, records one section of 3 seconds video, and contract initiator is indicated oneself to endorsed this conjunction with daily utterance
Together；
Step C is distributed to the client terminal of each contract signatory after being encrypted by client network engine.
Contract wherein after contract initiator signature can be by irreversible Encryption Algorithm（It is defaulted as SHA-512）After encryption,
It is transferred to the client terminal of all contract signatories first closed（Can be mobile phone or computer user）；
If if contract signatory does not register the system, contract initiator need to fill in contract signatory email address or
Cell-phone number, with latter mail, either short message can be sent on the mailbox or mobile phone of related signatory；
The client of step D, contract signatory decrypt encrypted treaty content, and give after receiving contract signature request
To be presented in the terminals such as computer, mobile phone, tablet computer；
If if wherein having contract signatory not register the system, contract signature can be received on mailbox or short message
Message request the contract list to be signed can then occur, if to contract automatically after the cell-phone number or mailbox ID Accreditation System
Content then enters step E without dispute, and refusal can be selected to sign if disputable to contract；
Step E, contract signatory sign a contract in the client of oneself, hand-written electric signature or calling business-electronic stamping system
After system is affixed one's seal, generates electronics and come into force an edition contract.
After wherein contract signatory has filled in relevant parameter, on-line signing contract；
The technology signed a contract is embodied as：
1）Contract signatory selects hand-written signature, then the signature of finger writing oneself can be used on mobile phone screen；
2）If contract signatory selects business-electronic stamped signature, then business-electronic signature blocks, every enterprise is called to have oneself
U-shield or the electronic module for signing mane of oneself, calling can then start after the module to authorize stamping, and business-electronic stamped signature number is written
According to；
3）Contract signatory selects voice and video signature, then can calling mobile phone or computer video record module, camera pair
Quasi contract initiator, records one section of 3 seconds video, and contract initiator is indicated oneself to endorsed this conjunction with daily utterance
Together；
Step F, after contract signature comes into force, contract related side is passed by the net distribution engine of local client in a manner of encrypted
All client blocks for installing the software additional are cast to as archive；
Contract wherein after contract signatory signature can be by irreversible Encryption Algorithm（It is defaulted as SHA-512）It is encrypted secret
Key is transferred to the client terminal of all registration users（Can be mobile phone or computer user）It is stored；
Step G：Each client can be on synchronizing network after logging in anonymous encryption not can recognize that contract dataset, and be distributed to
Other clients, until whole client block preserves the not recognizable encryption data of the anonymity；
After wherein each client logs in, the request of synchrodata can be automatically sent to neighbouring client, if there is new number
According to appearing in client nearby, then system starts all electronic contract data of automatic synchronization, until not new data go out
Until existing.
The data of all block chain client nodes, only local just to check contract dataset, any other client
What end stored is encrypted one section of secret key.
As shown in Fig. 2, when signing a contract between enterprise A and enterprise B, the system deployment of enterprise A takes in the enterprise's cloud of oneself
It is operated on business device or local server, and enterprise B is then, can both have been operated on the enterprise servers of oneself, operator
It can also be operated in the computer client of oneself.
When being signed between user AA and BB, contract signature operation directly is carried out using local client, operation
Content will be distributed to all server nodes.
It is obvious to a person skilled in the art that invention is not limited to the details of the above exemplary embodiments, Er Qie
In the case of without departing substantially from spirit or essential attributes of the invention, the present invention can be realized in other specific forms.Therefore, no matter
From the point of view of which point, the present embodiments are to be considered as illustrative and not restrictive, and the scope of the present invention is by appended power
Profit requires rather than above description limits, it is intended that all by what is fallen within the meaning and scope of the equivalent requirements of the claims
Variation is included within the present invention.Any reference signs in the claims should not be construed as limiting the involved claims.
In addition, it should be understood that although this specification is described in terms of embodiments, but not each embodiment is only wrapped
Containing an independent technical solution, this description of the specification is merely for the sake of clarity, and those skilled in the art should
It considers the specification as a whole, the technical solutions in the various embodiments may also be suitably combined, forms those skilled in the art
The other embodiment being appreciated that.
Claims (3)
1. a kind of online contract signature system and method based on block chain technology, it is characterised in that：Including：
Contract initiator's login system logs in one's own FTP client FTP for contract initiator；
Electronic contract is created, initiator writes contract for contract；
Encryption distribution, is distributed to the client of each contract signatory after being encrypted for client network engine；
Related contract signatory decrypts treaty content and checks, the client for contract signatory is signed in the contract that receives asks
After asking, decrypts encrypted treaty content and check；
Signature mode is selected, in the client selection hand-written electric signature of oneself or business-electronic is called for contract signatory
Stamping system, which is affixed one's seal, is used as signature mode；
Encryption distribution, installation is propagated to for contract related side by the net distribution engine of local client in a manner of encrypted
All clients of the software；
Non- contract signature related side stores encryption contract secret key, anonymity that can be on synchronizing network after being logged in for each client
Encryption not can recognize that contract dataset.
2. a kind of online contract signature system and method, feature based on block chain technology according to claim 1 exist
In：The establishment electronic contract further includes obtaining national time service centre time stamp, for the system and national time service center when
Between stab and linked.
3. a kind of online contract signature system and method, this method based on block chain technology are as follows：
Step A, first contract initiator log in one's own FTP client FTP, the timestamp of the system and national time service center
It is linked；
Wherein user inputs the included verification technique of account, password or calling mobile phone such as：Fingerprint identification module, iris recognition
Deng using the technology login system based on OAuth2.0 agreements；Subsequent system calls http automatically://www.ntsc.ac.cn
（It is at present the website at national time service center）, the current website time can be obtained after establishing URL connections；
Step B writes treaty content by contract initiator and is capped timestamp, hand-written electric signature or calling business-electronic stamping
After system is affixed one's seal, electronic contract is generated；
Wherein contract initiator creates a contract in client, and after having filled in relevant parameter, system calls national time service center
Timestamp, be written contract；Contract initiator signs a contract, generates electronic contract；
The technology wherein signed a contract is embodied as：
1）Contract initiator selects hand-written signature, then the signature of finger writing oneself can be used on mobile phone screen；
2）If contract initiator selects business-electronic stamped signature, then business-electronic signature blocks, every enterprise is called to have oneself
U-shield or the electronic module for signing mane of oneself, calling can then start after the module to authorize stamping, and business-electronic stamped signature number is written
According to；
3）Contract initiator selects voice and video signature, then can calling mobile phone or computer video record module, camera pair
Quasi contract initiator, records one section of 3 seconds video, and contract initiator is indicated oneself to endorsed this conjunction with daily utterance
Together；
Step C is distributed to the client terminal of each contract signatory after being encrypted by client network engine；
Contract wherein after contract initiator signature can be by irreversible Encryption Algorithm（It is defaulted as SHA-512）After encryption, transmission
To the client terminal of all contract signatories first closed（Can be mobile phone or computer user）；
If if contract signatory does not register the system, contract initiator need to fill in contract signatory email address or
Cell-phone number, with latter mail, either short message can be sent on the mailbox or mobile phone of related signatory；
The client of step D, contract signatory decrypt encrypted treaty content, and give after receiving contract signature request
To be presented in the terminals such as computer, mobile phone, tablet computer；
If if wherein having contract signatory not register the system, contract signature can be received on mailbox or short message
Message request the contract list to be signed can then occur, if to contract automatically after the cell-phone number or mailbox ID Accreditation System
Content then enters step E without dispute, and refusal can be selected to sign if disputable to contract；
Step E, contract signatory sign a contract in the client of oneself, hand-written electric signature or calling business-electronic stamping system
After system is affixed one's seal, generates electronics and come into force an edition contract；
After wherein contract signatory has filled in relevant parameter, on-line signing contract；
The technology signed a contract is embodied as：
1）Contract signatory selects hand-written signature, then the signature of finger writing oneself can be used on mobile phone screen；
2）If contract signatory selects business-electronic stamped signature, then business-electronic signature blocks, every enterprise is called to have oneself
U-shield or the electronic module for signing mane of oneself, calling can then start after the module to authorize stamping, and business-electronic stamped signature number is written
According to；
3）Contract signatory selects voice and video signature, then can calling mobile phone or computer video record module, camera pair
Quasi contract initiator, records one section of 3 seconds video, and contract initiator is indicated oneself to endorsed this conjunction with daily utterance
Together；
Step F, after contract signature comes into force, contract related side is passed by the net distribution engine of local client in a manner of encrypted
All client blocks for installing the software additional are cast to as archive；
Contract wherein after contract signatory signature can be by irreversible Encryption Algorithm（It is defaulted as SHA-512）It is encrypted secret
Key is transferred to the client terminal of all registration users（Can be mobile phone or computer user）It is stored；
Step G：Each client can be on synchronizing network after logging in anonymous encryption not can recognize that contract dataset, and be distributed to
Other clients, until whole client block preserves the not recognizable encryption data of the anonymity；
After wherein each client logs in, the request of synchrodata can be automatically sent to neighbouring client, if there is new number
According to appearing in client nearby, then system starts all electronic contract data of automatic synchronization, until not new data go out
Until existing.
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| CN201710128783.5A CN108537046A (en) | 2017-03-06 | 2017-03-06 | A kind of online contract signature system and method based on block chain technology |
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| CN201710128783.5A CN108537046A (en) | 2017-03-06 | 2017-03-06 | A kind of online contract signature system and method based on block chain technology |
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| CN109104444A (en) * | 2018-10-30 | 2018-12-28 | 四川长虹电器股份有限公司 | A kind of electronic signature method based on block chain |
| CN109255712A (en) * | 2018-10-09 | 2019-01-22 | 重庆君子签科技有限公司 | Electronic signature method, apparatus, storage medium and server |
| CN109409876A (en) * | 2018-09-27 | 2019-03-01 | 深圳壹账通智能科技有限公司 | Electronic contract signature method, apparatus, equipment and storage medium based on block chain |
| CN109472545A (en) * | 2018-10-12 | 2019-03-15 | 重庆君子签科技有限公司 | Signing system based on local disposition |
| CN109492983A (en) * | 2018-09-26 | 2019-03-19 | 深圳壹账通智能科技有限公司 | E-seal based on block chain intelligence contract signs method and apparatus |
| CN109635572A (en) * | 2018-11-05 | 2019-04-16 | 深圳变设龙信息科技有限公司 | A kind of contract signing method, apparatus and terminal device based on block chain |
| CN109711835A (en) * | 2018-12-29 | 2019-05-03 | 杭州趣链科技有限公司 | A kind of over-the-counter program release based on block chain and transaction system and method |
| CN109754267A (en) * | 2018-12-29 | 2019-05-14 | 百度在线网络技术（北京）有限公司 | Brand authorization method, device, equipment and medium based on block chain |
| CN109784873A (en) * | 2019-02-28 | 2019-05-21 | 飞天诚信科技股份有限公司 | A kind of working method and equipment of electronic contract signature platform |
| CN109978543A (en) * | 2019-04-03 | 2019-07-05 | 浙江鲸腾网络科技有限公司 | A kind of method, apparatus, electronic equipment and the storage medium of contract signature |
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| CN109784873B (en) * | 2019-02-28 | 2021-07-02 | 飞天诚信科技股份有限公司 | Working method and device of electronic contract signing platform |
| CN110084615A (en) * | 2019-03-15 | 2019-08-02 | 杭州钱袋金融信息服务有限公司 | A kind of banking contract online verification method |
| CN110097372A (en) * | 2019-03-15 | 2019-08-06 | 杭州百航信息技术有限公司 | A kind of contract online verification method |
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| CN109978543A (en) * | 2019-04-03 | 2019-07-05 | 浙江鲸腾网络科技有限公司 | A kind of method, apparatus, electronic equipment and the storage medium of contract signature |
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| CN110443076B (en) * | 2019-08-07 | 2021-06-01 | 瑞资(北京)科技有限公司 | Evidence storage method and system based on real-name block chain |
| CN110443076A (en) * | 2019-08-07 | 2019-11-12 | 瑞资(北京)科技有限公司 | Card method and system is deposited based on real name block chain |
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| CN110830449A (en) * | 2019-10-17 | 2020-02-21 | 北京三快在线科技有限公司 | File processing method and device, electronic equipment and readable storage medium |
| CN110796460A (en) * | 2020-01-03 | 2020-02-14 | 支付宝(杭州)信息技术有限公司 | Contract establishing method and device |
| CN111898977A (en) * | 2020-07-22 | 2020-11-06 | 北京厚泽人力资源有限公司 | Electronic signing system and method |
| CN112749380A (en) * | 2021-01-19 | 2021-05-04 | 上海茵罗智能科技有限公司 | Method for automatically signing contract on line |
| CN113672991A (en) * | 2021-08-11 | 2021-11-19 | 江苏埃洛德数据技术有限公司 | Public electronic contract contracting method based on block chain technology |
| CN116527692A (en) * | 2023-06-29 | 2023-08-01 | 广东维信智联科技有限公司 | Contract file cloud synchronization method based on Internet |
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