CN116912002B - Real estate transaction system based on blockchain technology - Google Patents
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Abstract
The invention relates to the field of blockchain, and discloses a real estate transaction system based on the blockchain technology, which is characterized in that identity information distributed mapping is carried out on each user of real estate transaction to obtain user identity mapping information, real estate transaction demand information of the user is obtained based on the user identity mapping information, and the real estate transaction demand information is transmitted to an intelligent contract layer for data processing; processing the real estate transaction demand information by utilizing the transaction matching intelligent contract to obtain contract real estate transaction information; acquiring encrypted real estate transaction information based on FHE homomorphic encryption algorithm; calculating to obtain a property transaction Hash value through a Hash algorithm, and storing the transaction Hash value into data of encrypted property transaction information to obtain Hash property transaction information; the transaction information data in the hash property transaction information is randomly selected through the consensus algorithm, so that the consensus property transaction information is obtained, the efficiency of property transaction and lease transaction can be improved, and the customer satisfaction is improved.
Description
Technical Field
The invention relates to the technical field of blockchain, in particular to a real estate transaction system based on a blockchain technology.
Background
With the improvement of the urban rate, more and more floating population is rushed to the cities with developed economy and rich resources, and the prosperous development of the real estate industry is promoted. In the existing stock market of real estate, real estate transaction and house renting industries continue to continuously carry out fire heat, real estate intermediaries or third party platforms often earn high service fees by means of information barriers, binding consumption and the like, and renting experience of both transaction parties is seriously affected. Meanwhile, bad phenomena such as false house sources, unilateral default and the like exist in the leasing process. Therefore, how to establish a safe and reliable transaction environment, and improve the transaction efficiency and user experience in the renting process, and improve the real estate transaction and real estate renting efficiency and the transaction success rate are technical problems to be solved in the current stage.
Disclosure of Invention
The invention aims to solve the problems, and designs a real estate transaction system based on a blockchain technology.
The invention provides a real estate transaction system based on a blockchain technology, which comprises an information mapping module, a transaction demand module, an intelligent contract module, a homomorphic encryption module, a hash encryption module and a consensus algorithm module:
the information mapping module is used for carrying out identity information distributed mapping on each user of real estate transaction to obtain user identity mapping information, and rights in the user identity mapping information corresponding to each user are different in right;
the transaction demand module is used for acquiring the real estate transaction demand information of the user based on the user identity mapping information, and transmitting the real estate transaction demand information to the intelligent contract module for data processing;
the intelligent contract module is used for acquiring real estate transaction demand information, establishing a transaction matching intelligent contract based on the real estate transaction rule and the real estate lease rule, and processing the real estate transaction demand information by utilizing the transaction matching intelligent contract to obtain contract real estate transaction information;
the homomorphic encryption module is used for carrying out encryption processing on the contract real estate transaction information based on an FHE homomorphic encryption algorithm to obtain encrypted real estate transaction information;
the Hash encryption module is used for calculating the encrypted real estate transaction information through a Hash algorithm to obtain a real estate transaction Hash value, and storing the transaction Hash value into the data of the encrypted real estate transaction information to obtain the Hash real estate transaction information;
and the consensus algorithm module is used for randomly selecting the transaction information data in the Hash property transaction information through a consensus algorithm to obtain consensus property transaction information, and inputting the consensus property transaction information into a database for storage.
Optionally, in a first implementation manner of the first aspect of the present invention, the information mapping module includes a data acquisition unit, a distributed mapping unit, and an information defining unit:
the system comprises a data acquisition unit, a real estate transaction unit and a real estate transaction unit, wherein the data acquisition unit is used for acquiring user information of each user of the real estate transaction, and auditing the user information, wherein the user information must meet the qualification of the real estate transaction;
the distributed mapping unit is used for carrying out distributed mapping on the identity information of each user of the real estate transaction to obtain user identity mapping information, and the user identity mapping information at least comprises a real estate transaction seller, a real estate transaction buyer, a real estate transaction lessee and a real estate transaction lessee;
and the information limiting unit is used for determining that the rights in the user identity mapping information corresponding to each user are different in right, and the user identity mapping information is unique and unchangeable.
Optionally, in a second implementation manner of the first aspect of the present invention, the transaction requirement module includes an information transmission unit, an information determination unit:
the information transmission unit is used for acquiring the real estate transaction demand information of the user based on the user identity mapping information, and transmitting the real estate transaction demand information to the intelligent contract module for data processing;
the information determining unit is used for determining that the property transaction demand information at least comprises property transaction identity registration, property transaction type selection, property transaction request release, property transaction matching, property lease contract creation and signing, property purchase contract creation and signing and property order inquiry.
Optionally, in a third implementation manner of the first aspect of the present invention, the smart contract module includes a contract establishing unit, a rule determining unit, an information matching unit, and a trading contract unit:
the contract establishing unit is used for establishing a transaction matching intelligent contract based on the real estate transaction rule and the real estate lease rule, and the transaction matching intelligent contract is used for carrying out real estate information matching according to the transaction demand information of the user;
the rule determining unit is used for determining that the property transaction rule and the property lease rule at least comprise property transaction amount information, property transaction time information and property transaction geographic position information;
the information matching unit is used for acquiring the real estate transaction demand information of the user, and carrying out data information matching on the real estate transaction demand information by utilizing the transaction matching intelligent contract to obtain transaction matching information;
and the transaction contract unit is used for generating a transaction contract through the transaction matching intelligent contract if the transaction matching information is approved by both sides of the transaction user, so as to obtain contract real estate transaction information.
Optionally, in a fourth implementation manner of the first aspect of the present invention, the homomorphic encryption module includes a key generating unit, a ciphertext generating unit, a homomorphic calculating unit, a double encryption unit, an information decrypting unit, and a continuous encryption unit:
a key generation unit for generating a key pair consisting of a key sk and a public key pk based on a key generation function K carrying a random seed parameter λ;
the ciphertext generating unit is used for encrypting the contract real estate transaction information through the public key pk to generate ciphertext real estate transaction information;
the homomorphic calculating unit is used for carrying out a certain amount of homomorphic calculation on the ciphertext property transaction information to obtain an intermediate state value, so that the intermediate state value approaches to but does not exceed the noise limit;
the double encryption unit is used for encrypting the key sk by using the public key pk to obtain an encrypted key ck, and encrypting the intermediate state value by using the public key pk to obtain a double-encrypted intermediate state value;
the information decryption unit is used for decrypting the intermediate state value through the encryption key ck to generate an intermediate state value with a reset noise level, and obtaining the reset noise intermediate state value;
and the continuous encryption unit is used for continuously carrying out encryption calculation on the ciphertext property transaction information by using the reset noise intermediate state value to obtain encrypted property transaction information.
Optionally, in a fifth implementation manner of the first aspect of the present invention, the hash encryption module hashes an encryption unit, a data storage unit, and a data obtaining unit:
the Hash encryption unit is used for calculating the encrypted real estate transaction information through a Hash algorithm to obtain real estate transaction Hash values;
the data storage unit is used for selecting at least one piece of encrypted property transaction information, storing the property transaction hash value into the back-end data of the encrypted property transaction information and storing the back-end data into the front-end data of the next encrypted property transaction information;
the data obtaining unit is used for storing the real estate transaction hash value of all the front-end data and the back-end data of the encrypted real estate transaction information to obtain the hash real estate transaction information.
Optionally, in a sixth implementation manner of the first aspect of the present invention, the consensus algorithm module includes a random selection unit and a data storage unit:
the random selection unit is used for randomly selecting transaction information data in the Hash property transaction information through a consensus algorithm, and carrying out information transmission or information storage on the randomly selected Hash property transaction information to obtain consensus property transaction information;
the data storage unit is used for inputting the consensus property transaction information into a database for storage, wherein the database is a transaction completion information database of property transaction.
In a second aspect, the present invention provides a real estate transaction system based on blockchain technology, the system comprising the steps of:
carrying out identity information distributed mapping on each user of real estate transaction to obtain user identity mapping information, wherein rights in the user identity mapping information corresponding to each user are different in right;
acquiring property transaction demand information of a user based on the user identity mapping information, and transmitting the property transaction demand information to an intelligent contract layer for data processing;
acquiring property transaction demand information, establishing a transaction matching intelligent contract based on the property transaction rule and the property lease rule, and processing the property transaction demand information by utilizing the transaction matching intelligent contract to obtain contract property transaction information;
encryption processing is carried out on the contract real estate transaction information based on an FHE homomorphic encryption algorithm, so that encrypted real estate transaction information is obtained;
calculating the encrypted property transaction information through a Hash Hash algorithm to obtain a property transaction Hash value, and storing the transaction Hash value into data of the encrypted property transaction information to obtain Hash property transaction information;
and randomly selecting transaction information data in the Hash property transaction information through a consensus algorithm to obtain consensus property transaction information, and inputting the consensus property transaction information into a database for storage.
Optionally, in a first implementation manner of the second aspect of the present invention, the real estate transaction system further includes the following steps:
establishing a transaction matching intelligent contract based on the real estate transaction rule and the real estate lease rule, wherein the transaction matching intelligent contract performs real estate information matching according to the user transaction demand information;
the property transaction rules and the property lease rules at least comprise property transaction amount information, property transaction time information and property transaction geographic position information;
acquiring real estate transaction demand information of a user, and performing data information matching on the real estate transaction demand information by utilizing the transaction matching intelligent contract to obtain transaction matching information;
and if the transaction matching information is approved by both sides of the transaction user, generating a transaction contract through the transaction matching intelligent contract to obtain contract real estate transaction information.
Optionally, in a second implementation manner of the second aspect of the present invention, the real estate transaction system further includes the following steps:
generating a key pair consisting of a key sk and a public key pk based on a key generation function K carrying a random seed parameter λ;
encrypting the contract real estate transaction information through the public key pk to generate ciphertext real estate transaction information;
performing a certain amount of homomorphic calculation on the ciphertext real estate transaction information to obtain an intermediate state value, so that the intermediate state value approaches but does not exceed a noise limit;
encrypting the key sk by using the public key pk to obtain an encrypted key ck, and encrypting the intermediate state value by using the public key pk to obtain a double-encryption intermediate state value;
decrypting the intermediate state value through the encryption key ck to generate an intermediate state value with a reset noise level, and obtaining the reset noise intermediate state value;
and continuing to encrypt and calculate the ciphertext property transaction information by using the reset noise intermediate state value to obtain encrypted property transaction information.
In the technical scheme provided by the invention, the user identity mapping information is obtained by carrying out identity information distributed mapping on each user of real estate transaction, and rights in the user identity mapping information corresponding to each user are different in right; acquiring property transaction demand information of a user based on the user identity mapping information, and transmitting the property transaction demand information to an intelligent contract layer for data processing; acquiring property transaction demand information, establishing a transaction matching intelligent contract based on the property transaction rule and the property lease rule, and processing the property transaction demand information by utilizing the transaction matching intelligent contract to obtain contract property transaction information; encryption processing is carried out on the contract real estate transaction information based on an FHE homomorphic encryption algorithm, so that encrypted real estate transaction information is obtained; calculating the encrypted property transaction information through a Hash Hash algorithm to obtain a property transaction Hash value, and storing the transaction Hash value into data of the encrypted property transaction information to obtain Hash property transaction information; and randomly selecting transaction information data in the Hash property transaction information through a consensus algorithm to obtain consensus property transaction information, and inputting the consensus property transaction information into a database for storage. The method can realize transparency and auditability of the transaction process between the house renter and the house renter under the condition of not depending on participation of the centralization mechanism, so that the renter and the house renter with the same conditions can rapidly achieve the transaction, the efficiency of the house property transaction and the renting transaction is improved, and the customer satisfaction is improved.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention.
FIG. 1 is a schematic diagram of a real estate transaction system based on a blockchain technology according to a first embodiment of the present invention;
FIG. 2 is a schematic diagram of a real estate transaction system based on blockchain technology according to a second embodiment of the present invention;
FIG. 3 is a schematic diagram of a third embodiment of a real estate transaction system based on blockchain technology according to an embodiment of the present invention.
Detailed Description
The terms "first," "second," "third," "fourth" and the like in the description and in the claims and in the above drawings, if any, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments described herein may be implemented in other sequences than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, apparatus, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed or inherent to such process, method, article, or apparatus.
For ease of understanding, the following describes a specific flow of an embodiment of the present invention, referring to fig. 1, which is a schematic diagram of a first embodiment of a real estate transaction system based on a blockchain technology, the method specifically includes:
the information mapping module 101 is configured to perform identity information distributed mapping on each user in real estate transaction to obtain user identity mapping information, where rights in the user identity mapping information corresponding to each user are different;
in this embodiment, a specific data acquisition unit is configured to acquire user information of each user in real estate transaction, and audit the user information, where the user information must satisfy the qualification of real estate transaction; the distributed mapping unit is used for carrying out distributed mapping on the identity information of each user of the real estate transaction to obtain user identity mapping information, wherein the user identity mapping information at least comprises a real estate transaction seller, a real estate transaction buyer, a real estate transaction lessee and a real estate transaction lessee; the information limiting unit is used for determining that the rights in the user identity mapping information corresponding to each user are different in right, and the user identity mapping information is unique and unchangeable.
The transaction demand module 102 is configured to obtain real estate transaction demand information of a user based on the user identity mapping information, and transmit the real estate transaction demand information to the intelligent contract module for data processing;
in this embodiment, the specific information transmission unit is configured to obtain real estate transaction requirement information of a user based on user identity mapping information, and transmit the real estate transaction requirement information to the intelligent contract module for data processing; the information determining unit is used for determining that the property transaction demand information at least comprises property transaction identity registration, property transaction type selection, property transaction request release, property transaction matching, property lease contract creation and signing, property purchase contract creation and signing and property order inquiry.
The intelligent contract module 103 is configured to obtain real estate transaction demand information, establish a transaction matching intelligent contract based on real estate transaction rules and real estate lease rules, and process the real estate transaction demand information by using the transaction matching intelligent contract to obtain contract real estate transaction information;
in this embodiment, a specific contract establishing unit is configured to establish a transaction matching intelligent contract based on a property transaction rule and a property lease rule, where the transaction matching intelligent contract performs property information matching according to user transaction demand information; the rule determining unit is used for determining that the property transaction rule and the property lease rule at least comprise property transaction amount information, property transaction time information and property transaction geographic position information; the information matching unit is used for acquiring the real estate transaction demand information of the user, and carrying out data information matching on the real estate transaction demand information by utilizing a transaction matching intelligent contract to obtain transaction matching information; and the transaction contract unit is used for generating a transaction contract through the transaction matching intelligent contract if the transaction matching information is approved by both sides of the transaction user, so as to obtain contract real estate transaction information.
The homomorphic encryption module 104 is configured to encrypt the transaction information of the contracted real estate based on the FHE homomorphic encryption algorithm to obtain encrypted transaction information of the real estate;
in this embodiment, a specific key generating unit is configured to generate a key pair composed of a key sk and a public key pk based on a key generating function K carrying a random seed parameter λ; the ciphertext generating unit is used for encrypting the contracted real estate transaction information through the public key pk to generate ciphertext real estate transaction information; the homomorphic calculating unit is used for carrying out a certain amount of homomorphic calculation on the ciphertext real estate transaction information to obtain an intermediate state value, so that the intermediate state value is close to but not exceeds the noise limit; the double encryption unit is used for encrypting the key sk by using the public key pk to obtain an encrypted key ck, and encrypting the intermediate state value by using the public key pk to obtain a double-encrypted intermediate state value; the information decryption unit is used for decrypting the intermediate state value through the encryption key ck to generate an intermediate state value with a reset noise level, and obtaining the reset noise intermediate state value; and the continuous encryption unit is used for continuously carrying out encryption calculation on the ciphertext property transaction information by using the reset noise intermediate state value to obtain the encrypted property transaction information.
The Hash encryption module 105 is configured to calculate encrypted property transaction information through a Hash algorithm to obtain a property transaction Hash value, and store the transaction Hash value into data of the encrypted property transaction information to obtain Hash property transaction information;
in this embodiment, the specific Hash encryption unit is configured to calculate and encrypt the property transaction information through a Hash algorithm, so as to obtain a property transaction Hash value; the data storage unit is used for selecting at least one piece of encrypted property transaction information, storing the property transaction hash value into the back-end data of the encrypted property transaction information and storing the back-end data into the front-end data of the next encrypted property transaction information; the data obtaining unit is used for storing the real estate transaction hash value of all the front-end data and the back-end data of the encrypted real estate transaction information to obtain the hash real estate transaction information.
And the consensus algorithm module 106 is configured to randomly select transaction information data in one piece of hashed property transaction information through a consensus algorithm, obtain consensus property transaction information, and input the consensus property transaction information into the database for storage.
In this embodiment, a specific random selection unit is configured to randomly select, by using a consensus algorithm, transaction information data in one piece of hashed real estate transaction information, and perform information transmission or information storage on the randomly selected hashed real estate transaction information to obtain consensus real estate transaction information; the data storage unit is used for inputting the consensus property transaction information into a database for storage, and the database is a transaction completion information database of property transaction.
In this embodiment, all nodes in the entire blockchain network are grouped, where each group stores the same real estate transaction information of the blockchain, and each block real estate transaction information includes a plurality of block files; dividing the block file into a plurality of data segments, and encoding the data segments into a plurality of encoded segments by using erasure codes; and integrating each GS node in the same group to obtain complete block property transaction information, and carrying out uplink operation on the submitted property transaction information to store the property transaction information in a block chain, wherein the coding section comprises a check section used for decoding recovery and a data section of the original block file.
In this embodiment, a first commit request of the encapsulation information occurs to the consensus group, and each service node checks the first commit request, where the commit request includes a hash value of the encapsulation information; checking the integrity of the hash value of the package information, and after the checking is passed, generating a second submitting request to the consensus group; transaction verification is carried out through the service node, and after the verification is successful, the block chain service part in the service node is submitted, so that the on-chain information verification of the service node is completed; and after the verification is successful, submitting the second submitting request to the blockchain network to participate in the consensus, and when the second submitting request passes, sending the encapsulation information to the consensus group so as to carry out tracking verification on the encapsulation information in the consensus group.
In this embodiment, the entire blockchain network is divided, and the rear end service of the terminal is combined with the nodes in the blockchain to form a service node, where the terminal set provided by the service node forms a service domain of the node, and the service node provides services for all terminals in the entire service domain and participates in the entire consensus process of the blockchain network.
In the embodiment, the hash value and the authority data of the real estate transaction information are divided into a plurality of fragments to be used as manageable blocks, and the fragments are distributed on a plurality of nodes of the blockchain; adding the hash value of the real estate transaction information to the data head of each segment, copying the redundant copy of each segment, and determining the real estate transaction information and the position of the redundant copy; the property transaction information and redundant copies are distributed to the decentralized data nodes.
In this embodiment, when a user needs to access the digital certificate, an access permission request is submitted; taking the access right request and the blockchain corresponding information as input items of a triggering right request contract; acquiring an input item, carrying out request analysis on the input item to obtain an analysis result, and traversing the authority storage block to find an authority information attribute set; and judging whether the analysis results of the block head and the analysis authority request are equal, and extracting the property transaction information corresponding to the corresponding digital certificate when the analysis results are equal.
In this embodiment, an intelligent contract is deployed to implement an access control function, a user applies for access to trigger the intelligent contract, and the contract automatically executes attribute information of a calling data layer to determine authority and accessible data of the user, thereby controlling the data access condition of the user.
In the technical scheme provided by the invention, the user identity mapping information is obtained by carrying out identity information distributed mapping on each user of real estate transaction, and rights in the user identity mapping information corresponding to each user are different in right; based on the user identity mapping information, acquiring real estate transaction demand information of the user, and transmitting the real estate transaction demand information to an intelligent contract layer for data processing; acquiring property transaction demand information, establishing a transaction matching intelligent contract based on property transaction rules and property lease rules, and processing the property transaction demand information by utilizing the transaction matching intelligent contract to obtain contract property transaction information; encryption processing is carried out on the transaction information of the contracted real estate based on the FHE homomorphic encryption algorithm, so that the transaction information of the encrypted real estate is obtained; calculating the encrypted real estate transaction information through a Hash Hash algorithm to obtain a real estate transaction Hash value, and storing the transaction Hash value into data of the encrypted real estate transaction information to obtain the hashed real estate transaction information; and randomly selecting transaction information data in one piece of hash property transaction information through a consensus algorithm to obtain consensus property transaction information, and inputting the consensus property transaction information into a database for storage. The method can realize transparency and auditability of the transaction process between the house renter and the house renter under the condition of not depending on participation of the centralization mechanism, so that the renter and the house renter with the same conditions can rapidly achieve the transaction, the efficiency of the house property transaction and the renting transaction is improved, and the customer satisfaction is improved.
Referring to fig. 2, a second embodiment of a real estate transaction protection system based on blockchain technology according to the present invention is shown, and the smart contract module includes:
the contract establishing unit 1031 is configured to establish a transaction matching intelligent contract based on the property transaction rule and the property lease rule, where the transaction matching intelligent contract performs property information matching according to the user transaction demand information;
a rule determining unit 1032 for determining that the property transaction rule and the property lease rule at least include property transaction amount information, property transaction time information, and property transaction geographic position information;
the information matching unit 1033 is configured to obtain real estate transaction requirement information of a user, and perform data information matching on the real estate transaction requirement information by using a transaction matching intelligent contract to obtain transaction matching information;
and a transaction contract unit 1034, configured to generate a transaction contract through the transaction matching intelligent contract if the transaction matching information is approved by both parties of the transaction user, so as to obtain contract real estate transaction information.
Referring to fig. 3, a schematic structural diagram of a real estate transaction protection system based on blockchain technology according to an embodiment of the present invention is provided, where the homomorphic encryption module includes:
a key generation unit 1041 for generating a key pair composed of a key sk and a public key pk based on a key generation function K carrying a random seed parameter λ;
the ciphertext generating unit 1042 is configured to encrypt the contracted real estate transaction information by using the public key pk, and generate ciphertext real estate transaction information;
the homomorphic calculating unit 1043 is configured to perform a certain number of homomorphic calculations on the ciphertext property transaction information to obtain an intermediate state value, so that the intermediate state value approaches but does not exceed a noise limit;
a dual encryption unit 1044, configured to encrypt the key sk with the public key pk to obtain an encrypted key ck, and encrypt the intermediate state value with the public key pk to obtain a dual encrypted intermediate state value;
an information decryption unit 1045, configured to decrypt the intermediate state value by using the encryption key ck, and generate an intermediate state value with a reset noise level, so as to obtain a reset noise intermediate state value;
and the continuous encryption unit 1046 is configured to continuously perform encryption calculation on the ciphertext property transaction information by using the reset noise intermediate state value, so as to obtain encrypted property transaction information.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the above-described embodiments, and that the above-described embodiments and descriptions are only preferred embodiments of the present invention, and are not intended to limit the invention, and that various changes and modifications may be made therein without departing from the spirit and scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (9)
1. The real estate transaction system based on the blockchain technology is characterized by comprising an information mapping module, a transaction demand module, an intelligent contract module, a homomorphic encryption module, a hash encryption module and a consensus algorithm module:
the information mapping module is used for carrying out identity information distributed mapping on each user of real estate transaction to obtain user identity mapping information, and rights in the user identity mapping information corresponding to each user are different in right;
the transaction demand module is used for acquiring the real estate transaction demand information of the user based on the user identity mapping information, and transmitting the real estate transaction demand information to the intelligent contract module for data processing;
the intelligent contract module is used for acquiring the real estate transaction demand information, establishing a transaction matching intelligent contract based on real estate transaction rules and real estate lease rules, and processing the real estate transaction demand information by utilizing the transaction matching intelligent contract to obtain contract real estate transaction information;
the homomorphic encryption module is used for carrying out encryption processing on the contract real estate transaction information based on an FHE homomorphic encryption algorithm to obtain encrypted real estate transaction information;
the Hash encryption module is used for calculating the encrypted real estate transaction information through a Hash algorithm to obtain a real estate transaction Hash value, and storing the transaction Hash value into the data of the encrypted real estate transaction information to obtain the Hash real estate transaction information;
the consensus algorithm module is used for randomly selecting transaction information data in the Hash property transaction information through a consensus algorithm to obtain consensus property transaction information, and inputting the consensus property transaction information into a database for storage;
the homomorphic encryption module comprises a key generation unit, a ciphertext generation unit, a homomorphic calculation unit, a double encryption unit, an information decryption unit and a continuous encryption unit:
a key generation unit for generating a key pair consisting of a key sk and a public key pk based on a key generation function K carrying a random seed parameter λ;
the ciphertext generating unit is used for encrypting the contract real estate transaction information through the public key pk to generate ciphertext real estate transaction information;
the homomorphic calculating unit is used for carrying out a certain amount of homomorphic calculation on the ciphertext property transaction information to obtain an intermediate state value, so that the intermediate state value approaches to but does not exceed the noise limit;
the double encryption unit is used for encrypting the key sk by using the public key pk to obtain an encrypted key ck, and encrypting the intermediate state value by using the public key pk to obtain a double-encrypted intermediate state value;
the information decryption unit is used for decrypting the intermediate state value through the encryption key ck to generate an intermediate state value with a reset noise level, and obtaining the reset noise intermediate state value;
and the continuous encryption unit is used for continuously carrying out encryption calculation on the ciphertext property transaction information by using the reset noise intermediate state value to obtain encrypted property transaction information.
2. The real estate transaction system based on the blockchain technology of claim 1 wherein the information mapping module includes a data acquisition unit, a distributed mapping unit, an information defining unit:
the system comprises a data acquisition unit, a real estate transaction unit and a real estate transaction unit, wherein the data acquisition unit is used for acquiring user information of each user of the real estate transaction, and auditing the user information, wherein the user information must meet the qualification of the real estate transaction;
the distributed mapping unit is used for carrying out distributed mapping on the identity information of each user of the real estate transaction to obtain user identity mapping information, and the user identity mapping information at least comprises a real estate transaction seller, a real estate transaction buyer, a real estate transaction lessee and a real estate transaction lessee;
and the information limiting unit is used for determining that the rights in the user identity mapping information corresponding to each user are different in right, and the user identity mapping information is unique and unchangeable.
3. The real estate transaction system based on the blockchain technology of claim 1 wherein the transaction demand module includes an information transmission unit, an information determination unit:
the information transmission unit is used for acquiring the real estate transaction demand information of the user based on the user identity mapping information, and transmitting the real estate transaction demand information to the intelligent contract module for data processing;
the information determining unit is used for determining that the property transaction demand information at least comprises property transaction identity registration, property transaction type selection, property transaction request release, property transaction matching, property lease contract creation and signing, property purchase contract creation and signing and property order inquiry.
4. The real estate transaction system based on the blockchain technology of claim 1 wherein the intelligent contract module includes a contract establishing unit, a rule determining unit, an information matching unit, a transaction contract unit:
the contract establishing unit is used for establishing a transaction matching intelligent contract based on the real estate transaction rule and the real estate lease rule, and the transaction matching intelligent contract is used for carrying out real estate information matching according to the transaction demand information of the user;
the rule determining unit is used for determining that the property transaction rule and the property lease rule at least comprise property transaction amount information, property transaction time information and property transaction geographic position information;
the information matching unit is used for acquiring the real estate transaction demand information of the user, and carrying out data information matching on the real estate transaction demand information by utilizing the transaction matching intelligent contract to obtain transaction matching information;
and the transaction contract unit is used for generating a transaction contract through the transaction matching intelligent contract if the transaction matching information is approved by both sides of the transaction user, so as to obtain contract real estate transaction information.
5. The real estate transaction system based on the blockchain technology of claim 1 wherein the hash encryption module hashes encryption unit, data storage unit, data obtaining unit:
the Hash encryption unit is used for calculating the encrypted real estate transaction information through a Hash algorithm to obtain real estate transaction Hash values;
the data storage unit is used for selecting at least one piece of encrypted property transaction information, storing the property transaction hash value into the back-end data of the encrypted property transaction information and storing the back-end data into the front-end data of the next encrypted property transaction information;
the data obtaining unit is used for storing the real estate transaction hash value of all the front-end data and the back-end data of the encrypted real estate transaction information to obtain the hash real estate transaction information.
6. The real estate transaction system based on the blockchain technology of claim 1 wherein the consensus algorithm module includes a random selection unit, a data storage unit:
the random selection unit is used for randomly selecting transaction information data in the Hash property transaction information through a consensus algorithm, and carrying out information transmission or information storage on the randomly selected Hash property transaction information to obtain consensus property transaction information;
the data storage unit is used for inputting the consensus property transaction information into a database for storage, wherein the database is a transaction completion information database of property transaction.
7. The real estate transaction system based on blockchain technology of claim 1 further comprising the steps of:
carrying out identity information distributed mapping on each user of real estate transaction to obtain user identity mapping information, wherein rights in the user identity mapping information corresponding to each user are different in right;
acquiring property transaction demand information of a user based on the user identity mapping information, and transmitting the property transaction demand information to an intelligent contract layer for data processing;
acquiring property transaction demand information, establishing a transaction matching intelligent contract based on the property transaction rule and the property lease rule, and processing the property transaction demand information by utilizing the transaction matching intelligent contract to obtain contract property transaction information;
encryption processing is carried out on the contract real estate transaction information based on an FHE homomorphic encryption algorithm, so that encrypted real estate transaction information is obtained;
calculating the encrypted property transaction information through a Hash Hash algorithm to obtain a property transaction Hash value, and storing the transaction Hash value into data of the encrypted property transaction information to obtain Hash property transaction information;
and randomly selecting transaction information data in the Hash property transaction information through a consensus algorithm to obtain consensus property transaction information, and inputting the consensus property transaction information into a database for storage.
8. The real estate transaction system based on blockchain technology of claim 7 further comprising the steps of:
establishing a transaction matching intelligent contract based on the real estate transaction rule and the real estate lease rule, wherein the transaction matching intelligent contract performs real estate information matching according to the user transaction demand information;
the property transaction rules and the property lease rules at least comprise property transaction amount information, property transaction time information and property transaction geographic position information;
acquiring real estate transaction demand information of a user, and performing data information matching on the real estate transaction demand information by utilizing the transaction matching intelligent contract to obtain transaction matching information;
and if the transaction matching information is approved by both sides of the transaction user, generating a transaction contract through the transaction matching intelligent contract to obtain contract real estate transaction information.
9. The real estate transaction system based on blockchain technology of claim 7 further comprising the steps of:
generating a key pair consisting of a key sk and a public key pk based on a key generation function K carrying a random seed parameter λ;
encrypting the contract real estate transaction information through the public key pk to generate ciphertext real estate transaction information;
performing a certain amount of homomorphic calculation on the ciphertext real estate transaction information to obtain an intermediate state value, so that the intermediate state value approaches but does not exceed a noise limit;
encrypting the key sk by using the public key pk to obtain an encrypted key ck, and encrypting the intermediate state value by using the public key pk to obtain a double-encryption intermediate state value;
decrypting the intermediate state value through the encryption key ck to generate an intermediate state value with a reset noise level, and obtaining the reset noise intermediate state value;
and continuing to encrypt and calculate the ciphertext property transaction information by using the reset noise intermediate state value to obtain encrypted property transaction information.
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