CN106960165B - Method for realizing multi-party electronic contract countersigning based on block chain intelligent contract - Google Patents
Method for realizing multi-party electronic contract countersigning based on block chain intelligent contract Download PDFInfo
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Abstract
The invention aims to provide a method for realizing multiparty countersigning of an electronic contract based on a block chain intelligent contract, which comprises the following steps: compiling an intelligent contract program comprising contract data; deploying an intelligent contract program into each node of a block chain platform; initializing contract data; each signing party confirms contract data and authenticates signing; after all the signatory parties sign the contract, the intelligent contract program calls a national time service center interface to add a credible timestamp. The invention realizes the electronic contract signing and the electronic contract storage in the intelligent contract by executing the intelligent contract program on all the block chain nodes, thereby effectively solving the problems that the existing electronic contract signing technology is easy to be distorted and has poor safety when signing the contract, and ensuring that not only the final electronic contract can not be distorted, but also the record and time of each signing contract can not be distorted.
Description
Technical Field
The invention relates to the field of Internet technology and electronic contracts, in particular to a method for realizing multiparty countersigning of an electronic contract based on a block chain intelligent contract.
Background
With the continued development of the economy, the number of contracts signed in commercial activities has increased dramatically. Traditional transaction activities generally carry out the signing of paper contracts, but the signing of paper contracts has a plurality of problems: first, it is a distance problem. Because of distance or other reasons, if the parties signing the contract can not finish signing in the same place, generally need to carry to another party and sign after the signing is finished by some party, if involve many parties signing, so will be very inefficient; second, if a large number of signatures of the same type are required, the traditional manual signature or seal method is time-consuming, labor-consuming and inefficient.
In order to solve the above problems, it is common in the art to sign an electronic contract. The existing electronic contract signing technology mainly has two modes of off-line signing and on-line signing. For off-line signing, each signing party needs to add an electronic signature of the own party and then sends the electronic signature to the next signing party, the process is complicated and difficult to control, and the electronic contract is easy to be tampered in the network transmission process. For the on-line signing mode, a signing platform generally adopts a data Certificate (CA) to verify signing parties of an electronic contract, and a trusted timestamp is added to a national time service center of a professional timestamp service institution after signing is finished to prove the legality, reliability and authenticity of the electronic contract. In the prior art, the electronic contract signing mode, whether off-line signing or on-line signing, has the problems of easy manual tampering and poor reliability and safety.
With the heat of 2016 block chain technology, some technologists store the complete electronic contract into the block chain after the electronic contract is signed, so as to ensure that the electronic contract is not tampered. This technique ensures that the final electronic contract is not tampered with, but it has some problems: the signing service of the electronic contract is mainly realized and circulated on a signing platform system, the signing platform system is generally based on a central node, is easy to be attacked and has safety and usability problems, and once the signing platform system has the problems, the signing service cannot be normally provided.
Disclosure of Invention
In order to overcome the defects of the prior art, embodiments of the present invention provide a method for realizing multiparty countersigning of an electronic contract based on a blockchain intelligent contract, which implements countersigning and storing of the electronic contract in the intelligent contract by executing an intelligent contract program on all blockchain nodes, so that the problems that the existing electronic contract signing technology is easy to be tampered and has poor security during countersigning the contract can be effectively solved, and it can be ensured that not only the final electronic contract cannot be tampered, but also the record and time of each signing contract cannot be tampered.
In order to achieve the above purpose, a method for realizing multi-party countersigning of an electronic contract based on a block chain intelligent contract is provided, which comprises the following steps:
A) compiling an intelligent contract program, wherein the intelligent contract program comprises contract data;
B) deploying an intelligent contract program into each node of a block chain platform;
C) initializing contract data;
D) each signing party confirms contract data and authenticates signing;
E) and after all the signatory parties sign the contract, the intelligent contract program carries out time marking.
Preferably, the time marking method adds a trusted time stamp to the national time service center interface called by the intelligent contract program.
Preferably, the intelligent contract program is provided with an initialization interface, and the step C) is realized through the initialization interface.
Preferably, the intelligent contract program is provided with a query interface, and each contractor in the step D) confirms the contract data through the query interface.
Preferably, the intelligent contract program is provided with a signing interface, and each signing party in the step D) realizes authentication signing through the signing interface.
Preferably, the signing party logs in the signing interface, and if the contract data indicates that the signing is successful, the operation is not performed; otherwise, generating an electronic signature, changing the contract data to indicate that the contract is successful, and adding the digital signature content in the contract data.
Preferably, the digital signature generating step is: and generating a digital abstract by using a hash algorithm on the same data, and encrypting the digital abstract by using a private key of a personal certificate of a signing party to obtain a digital signature.
Preferably, the contract data includes a contract ID, a contract number, contract contents, a contract status, contract completion time, and contractor data.
Preferably, the contractor data includes a contractor ID, a contractor owner, a contractor name, a contract status, and a contract time.
Compared with the prior art, the invention has the advantages that:
by executing intelligent contract programs on all block chain nodes, electronic contract countersigning and electronic contract storage are realized in the intelligent contracts, so that the problems that the existing electronic contract signing technology is easy to be distorted and has poor safety during countersigning of the contracts can be effectively solved, and the final electronic contract cannot be distorted, and the record and time of each signed contract cannot be distorted; the intelligent contract program is provided with an initial interface, an inquiry interface and a signing interface, so that a signing party signs conveniently, the effectiveness is improved, and the accuracy is ensured.
Drawings
FIG. 1 is a schematic flow diagram of the process of the present invention.
Detailed Description
In the description of the present invention, the terms "upper", "lower", "front", and "rear", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention but do not require that the present invention must be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
The following further describes embodiments of the present invention with reference to the drawings.
In order to ensure the confidentiality of a communication channel and prevent transmitted data from being intercepted or tampered, each signing party and the server related to the method are firstly provided with a digital certificate issued by a trusted authority, and the signing party and the server are connected through SSL.
The invention provides a method for realizing multiparty countersigning of an electronic contract based on a block chain intelligent contract, which comprises the following steps: compiling an intelligent contract program comprising contract data, wherein the intelligent contract program is provided with an initialization interface, a query interface and a signing interface; deploying an intelligent contract program into each node of a block chain platform; initializing contract data by an initialization interface; each signing party inquires and confirms contract data through the inquiry interface and authenticates and signs through the signing interface, after all signing parties finish signing, the intelligent contract program carries out time marking, and the time marking method adds a credible time stamp for the intelligent contract program calling a national time service center interface.
In the method disclosed by the invention, the countersigning service of the electronic contract is realized by a blockchain intelligent contract, and an intelligent contract program is a section of computer programming language code program and is executed on each node of a blockchain. The invention realizes the whole process of multi-party countersigning of the electronic contract by executing an initialization interface, a query interface and a signing interface of the intelligent contract on a block chain, after the contract data is initialized, a signing party confirms the contract and authenticates the signing, a block chain platform broadcasts an intelligent contract program to each block chain node, after the next signing party authenticates and signs through the query interface and the signing interface, the block chain platform broadcasts the intelligent contract program to each block chain node, and the process is continued until the last signing party finishes countersigning, and the intelligent contract program adds a timestamp. Relevant data in the whole signing process can be stored in the block chain nodes, each block chain node comprises a timestamp connected with a previous block chain link point, so that the data cannot be tampered, once the data is recorded, the data in one block chain node cannot be reversed, each block chain node stores a complete distributed account copy, and the characteristics of data incapability of being tampered, impossibility, high availability, traceability and the like are realized by combining technologies such as a consensus mechanism, an encryption algorithm and the like, so that the trust problem among human beings is solved indirectly through a computer, and the fact that the final electronic contract cannot be tampered and the record and time of each signing contract cannot be tampered can be ensured.
Referring to fig. 1, the preferred embodiment of the present invention is as follows:
and step S01, each signed party communicates contract content online or offline, then the contract initiator writes a corresponding intelligent contract program according to the finally determined contract template and each signed party, and deploys the intelligent contract program to each node of the block chain. When the intelligent contract program is deployed, an initialization interface of the intelligent contract program is called, and contract content and information of a signing party are initialized.
And step S02, each signing party calls the inquiry interface of the intelligent contract program to confirm that the contract content is correct, and calls the signing interface of the intelligent contract to realize digital signature authentication signing.
And step S03, after all the signatory parties sign the electronic contract carefully, the intelligent contract program calls the interface of the national time service center to add the credible time stamp to the electronic contract content and the digital signature of each signatory party.
Through the steps, electronic contract signing and storing are performed on the block chain, and signing contract recording and final contract content cannot be forged and falsified. And finally, adding a credible timestamp on the final electronic contract content and the digital signatures of all signatory parties, so that the integrity and existing time points of the final electronic contract content can be solidified, and the electronic contract content and the signing time can be prevented from being forged and falsified.
In order to better understand the technical method implemented by the present invention, the data definition and interface of the intelligent contract in the blockchain will be described below, and all nodes in the blockchain have the same intelligent contract data definition and interface.
Intelligent contract data definition:
the contract data comprises a contract ID, a contract number, contract content, contract state, contract signing completion time and data of each signing party, and specifically comprises the following steps:
the data of the signatory includes the ID of the signatory, the name of the signatory (such as the first party and the second party), the signing status, and the signing time, which are as follows:
explanation: the contract states in the contract data include two states, respectively, 0 is in the contract, 1 is after the contract, the initial state is 0, and the contract finishtime is initially empty. The signing state in the data of the signatory has two states, namely 0 is no signing, 1 is successful signing and the initial state is 0. The signTime initial state is null.
Intelligent contract interface sample code:
note that here a contract corresponds to an intelligent contract.
(1) Initializing contract interface
Init(Contract contract)
Description of the parameters: the Contract is a Contract structure object, and the Contract and the related information of each contracting party corresponding to the Contract are stored.
Interface logic description: and (5) initializing contract data and storing related data into a block chain.
(2) Contract inquiry interface
Query()
Interface logic description: and inquiring the contract and the information of the signing party corresponding to the intelligent contract, and returning the relevant information of the contract stored in the block chain, including contract content, signing states of all parties and the like.
(3) Contract interface
Sign(Customer customer)
Description of the parameters: the Customer is a Customer structure object, and the related information of the login contracting party is stored.
Interface logic description: and generating an electronic signature according to the information of the login contracting party, and changing the state of the contracting party corresponding to the contract into successful contracting. And if the subscription state is successful, not operating. And after the Contract is successfully signed, adding the digital signature content to the digitalDignature in the Contract structure. The steps of generating the digital signature are as follows: and generating a digital abstract by using a hash algorithm for the contract content, and encrypting the digital abstract by using a private key of a personal certificate of a signing party to obtain a digital signature. If the contract is the last contracting party, the electronic signature of each contracting party is added to the contract content to obtain an electronic data fingerprint, and then a time stamp is added to a national time service center to prove the validity of the contracting time. And finally storing the time point into the containfinishTime of the Contract structure, and changing the ContractStatus into 1, namely the signing completion state.
Variations and modifications to the above-described embodiments may occur to those skilled in the art, which fall within the scope and spirit of the above description. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and variations of the present invention should fall within the scope of the claims of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (9)
1. A method for realizing multi-party electronic contract countersigning based on a block chain intelligent contract is characterized by comprising the following steps:
A) writing an intelligent contract program, wherein the intelligent contract program comprises contract data;
B) deploying an intelligent contract program into each node of a block chain platform;
C) initializing contract data;
D) after a signing party confirms a contract and authenticates and signs, the block chain platform broadcasts an intelligent contract program to each block chain node, and after the next signing party authenticates and signs through the inquiry interface and the signing interface, the block chain platform broadcasts the intelligent contract program to each block chain node, and so on until the last signing party finishes signing;
E) and after all the signatory parties sign the contract, the intelligent contract program carries out time marking.
2. The method for multi-party rendezvous for an electronic contract based on blockchain intelligent contracts, as recited in claim 1, wherein: the time marking method is characterized in that the trusted time stamp is added on a national time service center interface called by an intelligent contract program.
3. The method for multi-party rendezvous for an electronic contract based on blockchain intelligent contracts, as recited in claim 1, wherein: the intelligent contract program is provided with an initialization interface, and the step C) is realized through the initialization interface.
4. The method for multi-party rendezvous for an electronic contract based on blockchain intelligent contracts, as recited in claim 1, wherein: the intelligent contract program is provided with a query interface, and each signing party in the step D) confirms contract data through the query interface.
5. The method for multi-party rendezvous for an electronic contract based on blockchain intelligent contracts, as recited in claim 1, wherein: the intelligent contract program is provided with a signing interface, and all signing parties in the step D) realize authentication signing through the signing interface.
6. The method for multi-party rendezvous for an electronic contract based on blockchain intelligent contracts, as recited in claim 5, wherein: a signing party logs in the signing interface, and if the contract data indicate that the signing is successful, the signing party does not operate; otherwise, generating an electronic signature, changing the contract data to indicate that the contract is successful, and adding digital signature content in the contract data.
7. The method for multi-party signup of an electronic contract based on blockchain intelligent contracts, according to claim 6, wherein the digital signature generating step is: and generating a digital abstract for the contract data by using a hash algorithm, and encrypting the digital abstract by using a private key of a personal certificate of a signing party to obtain a digital signature.
8. The method for multi-party signup of an electronic contract based on blockchain intelligent contracts according to any one of claims 1 to 7, wherein: the contract data comprises contract ID, contract number, contract content, contract state, contract signing completion time and data of each signing party.
9. The method for multi-party rendezvous for an electronic contract based on blockchain intelligent contracts, as recited in claim 8, wherein: the contractor data includes contractor ID, contractor affiliated party, contractor name, contract status and contract time.
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| CN105956923B (en) * | 2016-04-20 | 2022-04-29 | 上海如鸽投资有限公司 | Asset transaction system and digital authentication and transaction method of assets |
| CN106022775A (en) * | 2016-05-13 | 2016-10-12 | 邓迪 | File signature method and system based on block chains |
| CN106022681A (en) * | 2016-05-13 | 2016-10-12 | 杭州云象网络技术有限公司 | Logistics tracking method based on block chain |
| CN105976231A (en) * | 2016-06-24 | 2016-09-28 | 深圳前海微众银行股份有限公司 | Asset management method based on intelligent block chain contracts and nodes |
| CN106408299B (en) * | 2016-08-31 | 2020-04-14 | 江苏云签有限公司 | Electronic intelligent signing payment method based on block chain technology |
| CN106341493A (en) * | 2016-11-01 | 2017-01-18 | 北京金股链科技有限公司 | Entity rights oriented digitalized electronic contract signing method |
| CN106487821B (en) * | 2017-01-04 | 2020-07-03 | 北京天云智汇科技有限公司 | Digital signature method based on Internet block chain technology |
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