CN108681898A - A kind of data trade method and system based on block chain - Google Patents

Abstract

This application discloses a data transaction method based on blockchain, which solves the defects of centralized storage by using the decentralized characteristics of blockchain. Each user is a node in the blockchain network. The contract is deployed to the blockchain network in order to establish a data transaction channel between the data generator and the data purchaser. In terms of data storage, a distributed storage network with low storage cost and high security performance is selected to store the tradable data in ciphertext And generate a data index with a very small amount of data to locate the corresponding ciphertext, which is different from directly saving the data to the blockchain network, which can effectively reduce the cost of data storage. At the same time, the blockchain network will save all transaction records and synchronize them to all nodes, which greatly avoids the possibility of tampering and makes all transaction records open and transparent. The present application also discloses a block chain-based data transaction system at the same time, which has the above beneficial effects.

Description

A blockchain-based data transaction method and system

technical field

This application relates to the technical field of blockchain, in particular to a data transaction method and system based on blockchain.

Background technique

In the era of big data, data has immeasurable value no matter for individuals or enterprises, so the application of data trading industry was born. When users use the services provided by service (application) providers, they will also continuously generate personal data, which has extremely high commercial value.

As the data generator that generates these personal data, it should be able to obtain the trading rights of this part of the data. The right to process personal data according to individual wishes, while users lose the ability to collect and process personal data, resulting in today's service providers monopolizing the personal data generated by these users in the process of using these services, and may use these in private The phenomenon of data working for its own benefit. Users not only cannot rely on this part of personal data transactions to bring them their due benefits, but also need to bear the security risks brought by private transactions of enterprises to users' personal data. Therefore, the data transaction method under the current model is unfair to the users of the data generator.

Therefore, how to overcome the non-public, opaque, and unfair defects of existing data transactions, and provide a data transaction mechanism that is more open, transparent, and fair, and in which both service providers and users can participate in the data transaction process is A technical problem to be solved urgently by those skilled in the art.

Contents of the invention

The purpose of this application is to provide a blockchain-based data transaction method, which solves the defects of centralized storage by using the decentralized characteristics of the blockchain. Each user is a node in the blockchain network. The smart transaction contract is deployed to the blockchain network in order to establish a data transaction channel between the data generator and the data buyer. In terms of data storage, a distributed storage network with low storage cost and high security performance is selected, and the tradable data is encrypted. Store and generate a data index with a very small amount of data in the form of text to locate the corresponding ciphertext, which is different from directly saving the data to the blockchain network, which can effectively reduce the cost of data storage. At the same time, the blockchain network will save all transaction records and synchronize them to all nodes, which greatly avoids the possibility of tampering and makes all transaction records open and transparent.

Another object of the present application is to provide a blockchain-based data transaction system.

In order to achieve the above purpose, this application provides a blockchain-based data transaction method, including:

The application release terminal generates a smart transaction contract corresponding to the released application, and deploys the smart transaction contract to the blockchain network; wherein, the smart transaction contract is used to establish a transaction channel between two parties with data transaction needs;

The first data terminal classifies the tradable data generated by the application during use, and uses the description information of various types of tradable data and the address of the corresponding smart transaction contract to establish a data description table;

The first data terminal encrypts the tradable data generated in each preset period with a unique key, and stores the obtained ciphertext in the distributed storage network;

The distributed storage network generates a corresponding data index for the ciphertext stored in itself;

The second data terminal obtains the address of the smart transaction contract corresponding to the target type data by checking the description information in the data description table, and invokes the smart transaction contract under the address to initiate the transaction of the target type data to the blockchain network. transaction request;

When the first data terminal receives and agrees to the transaction request, it returns the data index and decryption key corresponding to the target type of data to the second data terminal through the smart transaction contract, and simultaneously receives the transaction transaction data contained in the request;

The second data terminal finds the corresponding ciphertext on the distributed storage network according to the received data index and decryption key and decrypts it to obtain readable original data; wherein, each terminal is a component nodes.

Optionally, the first data terminal uses a unique key to encrypt the tradable data generated in each preset period, including:

The first data terminal obtains its own identification information and the cycle start time of each preset cycle;

Generate a public key and a private key uniquely corresponding to each preset period by using the identification information and the start time of the period through an asymmetric encryption algorithm;

The first data terminal encrypts the tradable data generated within the corresponding preset period using a public key uniquely corresponding to each preset period.

Optionally, after the first data terminal encrypts the tradable data generated in the corresponding preset period with a public key uniquely corresponding to each preset period, it further includes:

A key storage queue is established on the first data terminal, and each pair of public key and private key is stored in pairs by using the key storage queue.

Optionally, before invoking the smart transaction contract under the address to initiate a transaction request for the target type of data to the blockchain network, it also includes:

The second data terminal broadcasts its own public key to all nodes in the blockchain network, so that the first data terminal uses the public key of the second data terminal to encrypt the data corresponding to the target category. Data index and decryption key.

Optionally, the data transaction method also includes:

In the smart transaction contract, different transaction data sharing ratios are set for the application release terminal that releases the application and the first data terminal that generates the target type data.

Optionally, the data transaction method also includes:

The blockchain network records all calls and usage information deployed in its own smart transaction contracts.

In order to achieve the above purpose, this application also provides a blockchain-based data transaction system, the data transaction system includes:

The application publishing terminal is used to generate a smart transaction contract corresponding to the published application, and deploy the smart transaction contract to the blockchain network; wherein, the smart transaction contract is used to establish a transaction channel between two parties with data transaction requirements ;

The first data terminal is used to classify the tradable data generated by the application in use, and use the description information of various types of tradable data and the address of the corresponding smart transaction contract to establish a data description table; use the unique key pair The tradable data generated in each preset period is encrypted, and the obtained ciphertext is stored in the distributed storage network; when the transaction request is received and approved, the smart transaction contract is sent to the first data terminal return the data index and decryption key corresponding to the target type data, and simultaneously receive the transaction data contained in the transaction request;

The distributed storage network is used to generate a corresponding data index for the ciphertext stored in itself;

The second data terminal is used to obtain the address of the smart transaction contract corresponding to the target type data by checking the description information in the data description table, and call the smart transaction contract under the address to initiate the target to the blockchain network A transaction request for the type of data; according to the received data index and decryption key, find the corresponding ciphertext on the distributed storage network and decrypt it to obtain readable original data;

Wherein, each terminal is a constituent node in the blockchain network.

Optionally, the first data terminal specifically acquires its own identification information and the cycle start time of each preset cycle; generate the identity information and the cycle start time through an asymmetric encryption algorithm A public key and a private key uniquely corresponding to each preset period; a data terminal that encrypts tradable data generated within the corresponding preset period using the public key uniquely corresponding to each preset period.

Optionally, the first data terminal is further configured to: establish a key storage queue, and use the key storage queue to store each pair of public key and private key in pairs.

Optionally, the second data terminal is further configured to: broadcast its own public key to all nodes in the blockchain network, so that the first data terminal uses the public key of the second data terminal Encrypt the data index and decryption key corresponding to the target type data.

Obviously, the blockchain-based data transaction method provided by this application solves the defects of centralized storage by using the decentralized characteristics of the blockchain. Each user is a node in the blockchain network. The transaction contract is deployed to the blockchain network in order to establish a data transaction channel between the data generator and the data buyer. In terms of data storage, a distributed storage network with low storage cost and high security performance is selected, and the tradable data is ciphertext Formally store and generate a data index with a very small amount of data to locate the corresponding ciphertext, which is different from directly saving the data to the blockchain network, which can effectively reduce the cost of data storage. At the same time, the blockchain network will save all transaction records and synchronize them to all nodes, which greatly avoids the possibility of tampering and makes all transaction records open and transparent. At the same time, the present application also provides a blockchain-based data transaction system, which has the above beneficial effects and will not be repeated here.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only It is an embodiment of the present application, and those skilled in the art can also obtain other drawings according to the provided drawings without creative work.

Fig. 1 is a flow chart of a blockchain-based data transaction method provided by the present application;

Fig. 2 is a flow chart of a method for encrypting tradable data and locating data buyers in the blockchain-based data transaction method provided by the present application;

Fig. 3 is a structural block diagram of a blockchain-based data transaction system provided by the present application;

Fig. 4 is a schematic diagram of a logical direction among execution subjects in the blockchain-based data transaction system provided by the present application.

Detailed ways

The core of this application is to provide a blockchain-based data transaction method and system, which solves the defects of centralized storage by using the decentralized characteristics of the blockchain. Each user is a node in the blockchain network. By deploying the smart transaction contract to the blockchain network, it is expected to establish a data transaction channel between the data generator and the data buyer. In terms of data storage, a distributed storage network with low storage cost and high security performance is selected to make the transaction data Store in the form of ciphertext and generate a data index with a very small amount of data to locate the corresponding ciphertext, which is different from directly saving the data to the blockchain network, which can effectively reduce the cost of data storage. At the same time, the blockchain network will save all transaction records and synchronize them to all nodes, which greatly avoids the possibility of tampering and makes all transaction records open and transparent.

In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments It is a part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.

Below in conjunction with FIG. 1 , FIG. 1 is a flow chart of a blockchain-based data transaction method provided by the present application.

It specifically includes the following steps:

S101: The application release terminal generates a smart transaction contract corresponding to the released application, and deploys the smart transaction contract to the blockchain network;

In the existing technology, application providers only release their own developed applications (APPs) to the public, and users can only use these applications. As for whether or what kind of personal data is generated during the use of these applications Usually it is opaque to users, but it is clear to the application provider who develops this application, and there are also channels to obtain these data, and even sell them privately for profit.

In order to solve this opaque problem, this application provides a smart transaction contract for the tradable data generated by the transaction user in the process of using the application while the application provider is developing the application, and the smart transaction contract Deployed to the blockchain network, it is expected to establish a transaction channel between the two parties with data transaction needs through the smart transaction contract, so as to avoid the phenomenon that the application provider conducts personal data transactions privately in the traditional way.

It should be noted that the application publishing terminal described here is a data terminal corresponding to when the application provider releases applications and smart transaction contracts, which can be a mobile phone, a high-performance server, and so on. At this time, the application publishing terminal has been used as a node in the blockchain network, and together with the subsequent first data terminal and the second data terminal to form the blockchain network, and deploying the smart transaction contract to the blockchain network is actually a Deploy the smart transaction contract to all nodes, so that any node can complete the transaction based on the same smart transaction contract.

As a new type of decentralized distributed security storage technology, blockchain technology is essentially a shared distributed database, which is recorded and verified by all participants in the blockchain network, and transaction information is recorded in chronological order. Blocks are generated and connected in sequence to form a chained data structure, using cryptography to ensure that the data cannot be tampered with or forged, so it has high security and high reliability.

On this basis, smart contracts can also be integrated to achieve transparent data access control. A smart contract is a transparent program code that runs under a decentralized computer network. It is a contract implemented through code. All nodes of , and it is difficult to tamper with after the contract is generated. The code that constitutes the smart contract is no different from the conventional functional code. It can also perform specific functions according to the pre-written code logic rules, which is convenient for calculation, modification, encryption and other operations. The smart contract is not just an automatically executable computer program, it is more like a system participant, it is absolutely credible, absolutely neutral, it is responsible for temporarily protecting your assets, and strictly follows the pre-negotiated rules. Execute the operation so that the entire system will run according to the preset program, and at the same time be witnessed by all the nodes that make up the blockchain network, no one can stop and interfere.

The smart transaction contract described in this application is a kind of smart contract, that is, it is mainly used for transactions, just like an absolutely neutral and impartial third-party executive agency, which is used to help data generators and data buyers realize data transactions, and guarantee The data buyer can receive the desired personal data while paying a certain purchase price, and the data generator can receive the purchase price paid by the data buyer while sending the personal data desired by the data buyer, just like Alipay's position relative to buyers and sellers.

Of course, in order to truly establish a data transaction channel between the data generator and the data buyer and realize the data transaction, many other parameters are required, such as the description information of various types of tradable data, the identity information of all parties, and other parameters. In this regard, a large number of public descriptions of smart contracts can be used for reference.

S102: The first data terminal classifies the tradable data generated by the application during use, and uses the description information of various types of tradable data and the address of the corresponding smart transaction contract to establish a data description table;

In order to achieve the data transaction purpose of the smart transaction contract, it is also necessary for the data buyer to determine which data he wants among all the generated personal data, and even which data the data generator (user) is willing to sell, etc. Therefore, the purpose of this step is to classify all the tradable data generated in order to merge various types of tradable data and obtain description information of various types of tradable data according to classification standards, and use the description information and deployment in the area The address of the corresponding smart transaction contract in the block chain network establishes a data description table.

This data description table is mainly used by the data buyer to determine which tradable data they want to purchase according to the contained description information, and to obtain the address of the corresponding smart transaction contract, so as to call the corresponding smart transaction from the address contract.

It should be noted that the first data terminal described in this step corresponds to the user who uses the application released by the application provider through the application publishing terminal, that is, the data terminal corresponding to the data generator is also a node in the blockchain network. The smartphone used by the user can also become a node.

Table 1 Example of data description table

The above table 1 is a specific implementation method given in this application by taking an email application as an example, that is, the data description table includes: service ID (one-to-one correspondence with the application released by the application provider), smart transaction contract address , List of tradable data type identifiers [k1, k2, k3, ..., kn], corresponding data description information of each type [d1, d2, d3, ..., dn] and data transaction rules [r1, r2, r3 ,...,rn]. Among them, the data transaction rules can be expressed in various forms. Since the object of the transaction is personal data, the data transaction rules are set according to different users, different data types, and different time periods when the data is generated. Specific restrictions can be made flexibly depending on the specific circumstances.

S103: The first data terminal encrypts the tradable data generated in each preset period with a unique key, and stores the obtained ciphertext in the distributed storage network;

When the data generator uses the application, the application will encrypt the generated tradable data with a unique key, and send the obtained ciphertext to the distributed storage network for storage. Normally, the operation of this step can be performed periodically at the same time interval, that is, all tradable data generated in a period is encrypted periodically. Specifically, the time interval of each cycle can be set to 1 day, 3 days or other suitable time, which is not specifically limited here, and can be flexibly adjusted according to actual conditions.

The function of the unique key is to firmly hold the ownership of the generated tradable data in the hands of the user who belongs to the data generator. Unless the user agrees or authorizes the corresponding decryption key, others cannot restore the ciphertext to the Readable raw data. To achieve this purpose, the unique key should uniquely correspond to the user, or in other words, the unique key should be generated based on the user's unique identification information. Specifically, when the possibility of mutual transmission of the same user's decryption key between different data buyers is excluded, the same unique key can be used to encrypt the tradable data generated in each period. If this possibility cannot be ruled out, the A unique key can be generated with periodic changes, which can be flexibly selected.

The traditional storage system uses a centralized storage server to store all data. The storage server becomes the bottleneck of the system performance and cannot meet the needs of large-scale storage applications. Therefore, the use of scalable system structure, the use of multiple storage servers to share the storage load, The distributed storage network that uses the location server to locate and store information not only improves the reliability, availability and access efficiency of the system, but is also easy to expand. Specifically, there are many options for distributed storage networks, such as DHT (Distributed Hash Table, Distributed Hash Table) storage network, which is a distributed storage method. In the case of no server, each client is responsible for a Small-scale routing, and responsible for storing a small part of data, so as to realize the addressing and storage of the entire DHT storage network; IPFS (InterPlanetary File System, Interstellar File System) is a network designed to create persistent and distributed storage and shared files Transmission protocol, this technology is a content-addressable peer-to-peer hypermedia distribution protocol, and the storage network based on this technology can also achieve the same data storage purpose as the DHT storage network.

It should be emphasized that the first data terminal used by each user affiliated to the data generating party will first generate and save all personal data generated by the application in the local of each first data terminal, and real-time or according to a predetermined cycle as required Encrypt the generated personal data, and finally upload the ciphertext to the distributed storage network for storage, instead of using this part of the data that is opaque to the user in plaintext as in the traditional mode, it can be directly stored in the centralized server provided by the application provider Obtain and complete the storage, even if the application provider obtains the ciphertext from a third party that provides a distributed storage network, it cannot be decrypted using the key only controlled by the user, so that the user who generates this part of personal data can realize the The complete control of this part of the data is not subject to the application provider in the case of non-disclosure and opacity.

S104: The distributed storage network generates a corresponding data index for the ciphertext stored in itself;

Since the generated data index is uniquely obtained based on the corresponding ciphertext, a relatively common way to obtain the data index is to use the hash algorithm to calculate the summary information (feature code) uniquely corresponding to the ciphertext, including a variety of For the specific algorithm of the Greek algorithm, those skilled in the art can obtain various specific implementations based on this method, which will not be repeated here.

S105: The second data terminal obtains the address of the smart transaction contract corresponding to the target type data by checking the description information in the data description table, and invokes the smart transaction contract under the address to initiate a transaction request for the target type data to the blockchain network;

When the data buyer determines the target type data according to the description information contained in the data description table, the address of the smart transaction contract corresponding to the target type data recorded in the data description table is also used to call the corresponding smart transaction from the address The contract initiates a transaction request for the target type of data to the blockchain network.

It should also be noted that, corresponding to the first data terminal used by the data generator, the second data terminal corresponds to the data buyer, so the data buyer can obtain various The description information of the tradable data and the address of the corresponding smart transaction contract, and call the corresponding smart transaction contract from this address.

When the smart transaction contract initiates a transaction request to the blockchain network, the smart transaction contract can also determine who is the corresponding data generator based on relevant information. Correspondingly, when the data generator agrees to the transaction request, it can also complete the data transfer. The data index and decryption key given by the generator are transferred to the data buyer for operation.

In order to prevent the data index and decryption key transferred to the data buyer from being intercepted or obtained by others through unknown means, readable original data cannot be obtained from the distributed storage network, and the data generator is required to use the unique key corresponding to the data buyer The encryption key encrypts the data index and decryption key, so that only the real data buyer can use the decryption key saved by himself to complete the decryption, so as to obtain the data index and decryption key given by the data generator.

Therefore, a method for the data generator to obtain the encryption key of the data buyer is: the data buyer broadcasts its own encryption key to all nodes in the blockchain network.

S106: When the first data terminal receives and agrees to the transaction request, return the data index and decryption key corresponding to the target type data to the second data terminal through the smart transaction contract, and simultaneously receive the transaction data contained in the transaction request;

The transaction data described in this step can be simply understood as the price paid by the purchaser to realize this transaction data. It can be expressed in various forms, such as currency data, some exchanged document data, and so on.

Furthermore, due to the contribution made by the application provider in this process, a sharing ratio can also be set for the application provider in the smart transaction contract, that is, the purchase price paid by the data buyer is generated by the application provider and the data. The parties receive benefits at the same time, so that the application provider can bring users a better user experience and continuously improve the market competitiveness of its own products under the incentive of this mechanism. The specific share ratio can be determined by the data generator and the application provider. It is determined through negotiation and is not specifically limited here.

S107: The second data terminal finds the corresponding ciphertext on the distributed storage network according to the received data index and decryption key, and decrypts it to obtain readable original data.

Based on the above technical solution, this embodiment provides a block chain-based data transaction method, which solves the defects of centralized storage by using the decentralization feature of the block chain, and each user is a member of the block chain network. Node, by deploying the smart transaction contract to the blockchain network, in order to establish a data transaction channel between the data generator and the data buyer, and choose a distributed storage network with low storage cost and high security performance for data storage, which will be able to Transaction data is stored in the form of ciphertext and a data index with a very small amount of data is generated to locate the corresponding ciphertext, which is different from directly saving data to the blockchain network, which can effectively reduce data storage costs. At the same time, the blockchain network will save all transaction records and synchronize them to all nodes, which greatly avoids the possibility of tampering and makes all transaction records open and transparent.

In conjunction with FIG. 2 below, FIG. 2 is a flow chart of a method for encrypting tradable data and locating data buyers in the blockchain-based data transaction method provided by this application.

S201: The first data terminal obtains its own identification information and the cycle start time of each preset cycle;

S202: Generate a public key and a private key uniquely corresponding to each preset period through an asymmetric encryption algorithm using the identification information and the period start time;

S203: The first data terminal encrypts the tradable data generated in the corresponding preset period by using the public key uniquely corresponding to each preset period;

S201, S202, and S203 of this embodiment provide a method for generating a unique key that changes with cycle changes, that is, using the fixed identity information of the data generator and the start time of each cycle that changes with time, Together, dynamically use the asymmetric encryption algorithm to obtain the transformed public key and private key.

Among them, an asymmetric encryption algorithm refers to an algorithm that can obtain a pair of different keys based on some information. This pair of different keys is usually called a public key and a private key according to different uses. It should be noted that , the content encrypted with the public key can only be decrypted with the private key generated at the same time. Similarly, the content encrypted with the private key can only be decrypted with the public key generated at the same time. The public key is usually easily obtained, and the private key is usually It is only held by an individual, so the file encrypted with the public key can only be decrypted by the user with the private key held by the user, so that the data is firmly in his own hands.

S204: Establish a key storage queue on the first data terminal, and use the key storage queue to store each pair of public key and private key in pairs;

Due to the adoption of the method of encrypting tradable data with transformed public keys in different cycles, the private key needs to be saved every time it is generated, so that the correct private key can be fed back to the data buyer in the future. This step provides a way to save the private key generated each time by establishing a key storage queue. Since the generation of each pair of asymmetric keys is proportional to the size of the time, the asymmetric keys in the queue should also be Arranged in the order of generation.

S205: Store the obtained ciphertext in the distributed storage network, and the distributed storage network generates a corresponding data index for the ciphertext stored in itself;

S206: The second data terminal broadcasts its own public key to all nodes in the blockchain network, so that the first data terminal uses the public key of the second data terminal to encrypt the data index and decryption key corresponding to the target type of data.

On the basis of the previous embodiment, this embodiment provides a method for generating a unique key that changes with the cycle change, which can eliminate the hidden danger of the same user's decryption key being transmitted between different data purchasers. The way of key storage queue is to store the generated pairs of asymmetric keys well, so that they can be searched later. Finally, the public key of the data buyer is notified by broadcasting, which ensures that only the real data buyer can use it. The decryption key saved by oneself completes the decryption.

Because of the complexity of the situation, it is impossible to list and explain them one by one. Those skilled in the art should be able to realize that there may be many examples based on the basic method principles provided by this application combined with actual situations. within the scope of protection.

Below in conjunction with Fig. 3, Fig. 3 is a structural block diagram of a blockchain-based data transaction system provided by the present application. Specifically, the data transaction system may include:

The application release terminal 100 is used to generate a smart transaction contract corresponding to the released application, and deploy the smart transaction contract to the blockchain network; wherein, the smart transaction contract is used to establish a transaction channel between two parties with data transaction needs;

The first data terminal 200 is used to classify the tradable data generated by the application in use, and use the description information of various types of tradable data and the address of the corresponding smart transaction contract to establish a data description table; The tradable data generated within the preset period is encrypted, and the obtained ciphertext is stored in the distributed storage network; when the transaction request is received and approved, the data corresponding to the target type data is returned to the first data terminal through the smart transaction contract Index and decryption keys, while receiving transaction data contained in transaction requests;

The distributed storage network 300 is used to generate a corresponding data index for the ciphertext stored in itself;

The second data terminal 400 is used to obtain the address of the smart transaction contract corresponding to the target type data by checking the description information in the data description table, and invoke the smart transaction contract under the address to initiate a transaction request for the target type data to the blockchain network; according to The received data index and decryption key find the corresponding ciphertext on the distributed storage network and decrypt it to obtain readable original data; where each terminal is a component node in the blockchain network.

Wherein, the first data terminal can specifically obtain its own identification information and the cycle start time of each preset cycle; use the identity identification information and cycle start time to generate a public address uniquely corresponding to each preset cycle through an asymmetric encryption algorithm. Key and private key; use the public key uniquely corresponding to each preset period to encrypt the data terminal of the tradable data generated within the corresponding preset period.

Further, the first data terminal can also be used to: establish a key storage queue, and use the key storage queue to store each pair of public key and private key in pairs;

The second data terminal can also be used to: broadcast its own public key to all nodes in the blockchain network, so that the first data terminal uses the public key of the second data terminal to encrypt the data index and decrypt the key corresponding to the target type data. key.

Furthermore, different transaction data sharing ratios may be set in the smart transaction contract for the application release terminal that releases the application and the first data terminal that generates the target type data;

The blockchain network records all calls and usage information deployed in its own smart transaction contracts.

Fig. 4 is a schematic diagram of a logical direction among execution subjects in the blockchain-based data transaction system provided by the present application.

Each embodiment in the description is described in a progressive manner, each embodiment focuses on the difference from other embodiments, and the same and similar parts of each embodiment can be referred to each other. As for the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and for the related information, please refer to the description of the method part.

Professionals can further realize that the units and algorithm steps of the examples described in conjunction with the embodiments disclosed herein can be implemented by electronic hardware, computer software or a combination of the two. In order to clearly illustrate the possible For interchangeability, in the above description, the composition and steps of each example have been generally described according to their functions. Whether these functions are executed by hardware or software depends on the specific application and design constraints of the technical solution. Skilled artisans may use different methods to implement the described functions for each specific application, but such implementation should not be regarded as exceeding the scope of the present application.

In this paper, specific examples are used to illustrate the principles and implementation methods of the present application, and the descriptions of the above embodiments are only used to help understand the methods and core ideas of the present application. For those of ordinary skill in the art, without departing from the principle of the application, some improvements and modifications can be made to the application, and these improvements and modifications also fall within the protection scope of the claims of the application.

It should also be noted that in this specification, relative terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that these entities or operations There is no such actual relationship or order between the operations. Furthermore, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus comprising a set of elements includes not only those elements, but also includes elements not expressly listed. other elements of or also include elements inherent in such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

Claims (10)

1. A blockchain-based data transaction method, characterized in that, comprising: The application release terminal generates a smart transaction contract corresponding to the released application, and deploys the smart transaction contract to the blockchain network; wherein, the smart transaction contract is used to establish a transaction channel between two parties with data transaction needs; The first data terminal classifies the tradable data generated by the application during use, and uses the description information of various types of tradable data and the address of the corresponding smart transaction contract to establish a data description table; The first data terminal encrypts the tradable data generated in each preset period with a unique key, and stores the obtained ciphertext in the distributed storage network; The distributed storage network generates a corresponding data index for the ciphertext stored in itself; The second data terminal obtains the address of the smart transaction contract corresponding to the target type data by checking the description information in the data description table, and invokes the smart transaction contract under the address to initiate the transaction of the target type data to the blockchain network. transaction request; When the first data terminal receives and agrees to the transaction request, it returns the data index and decryption key corresponding to the target type of data to the second data terminal through the smart transaction contract, and simultaneously receives the transaction transaction data contained in the request; The second data terminal finds the corresponding ciphertext on the distributed storage network according to the received data index and decryption key and decrypts it to obtain readable original data; wherein, each terminal is a component nodes. 2. The data transaction method according to claim 1, wherein the first data terminal uses a unique key to encrypt the tradable data generated in each preset period, including: The first data terminal obtains its own identification information and the cycle start time of each preset cycle; Generate a public key and a private key uniquely corresponding to each preset period by using the identification information and the start time of the period through an asymmetric encryption algorithm; The first data terminal encrypts the tradable data generated within the corresponding preset period using a public key uniquely corresponding to each preset period. 3. The data transaction method according to claim 2, characterized in that, after the first data terminal encrypts the tradable data generated within the corresponding preset period using a public key uniquely corresponding to each of the preset periods, Also includes: A key storage queue is established on the first data terminal, and each pair of public key and private key is stored in pairs by using the key storage queue. 4. The data transaction method according to claim 3, characterized in that before invoking the smart transaction contract under the address to initiate a transaction request for the target type of data to the blockchain network, further comprising: The second data terminal broadcasts its own public key to all nodes in the blockchain network, so that the first data terminal uses the public key of the second data terminal to encrypt the data corresponding to the target category. Data index and decryption key. 5. The data transaction method according to claim 1, further comprising: In the smart transaction contract, different transaction data sharing ratios are set for the application release terminal that releases the application and the first data terminal that generates the target type data. 6. The data transaction method according to any one of claims 1 to 5, further comprising: The blockchain network records all calls and usage information deployed in its own smart transaction contracts. 7. A blockchain-based data transaction system, characterized in that it comprises: The application publishing terminal is used to generate a smart transaction contract corresponding to the published application, and deploy the smart transaction contract to the blockchain network; wherein, the smart transaction contract is used to establish a transaction channel between two parties with data transaction requirements ; The first data terminal is used to classify the tradable data generated by the application in use, and use the description information of various types of tradable data and the address of the corresponding smart transaction contract to establish a data description table; use the unique key pair The tradable data generated in each preset period is encrypted, and the obtained ciphertext is stored in the distributed storage network; when the transaction request is received and approved, the smart transaction contract is sent to the first data terminal return the data index and decryption key corresponding to the target type data, and simultaneously receive the transaction data contained in the transaction request; The distributed storage network is used to generate a corresponding data index for the ciphertext stored in itself; The second data terminal is used to obtain the address of the smart transaction contract corresponding to the target type data by checking the description information in the data description table, and call the smart transaction contract under the address to initiate the target to the blockchain network A transaction request for the type of data; according to the received data index and decryption key, find the corresponding ciphertext on the distributed storage network and decrypt it to obtain readable original data; Wherein, each terminal is a constituent node in the blockchain network. 8. The data transaction system according to claim 7, wherein the first data terminal specifically obtains its own identification information and the cycle start time of each of the preset cycles; Generate the public key and private key uniquely corresponding to each of the preset periods through an asymmetric encryption algorithm with the start time of the period; use the public key uniquely corresponding to each of the preset periods to encrypt the data generated in the corresponding preset period A data terminal that can trade data. 9. The data transaction system according to claim 8, wherein the first data terminal is further used for: establishing a key storage queue, and using the key storage queue to store each pair of public keys and private key. 10. The data transaction system according to claim 9, wherein the second data terminal is further configured to: broadcast its own public key to all nodes in the blockchain network, so that the second data terminal A data terminal encrypts a data index and a decryption key corresponding to the target type data by using the public key of the second data terminal.