WO2021227457A1

WO2021227457A1 - Blockchain-based electronic data evidence preservation method and system, and storage medium and terminal

Info

Publication number: WO2021227457A1
Application number: PCT/CN2020/133925
Authority: WO
Inventors: 申志国; 方红波; 丁哲; 张文娟
Original assignee: 特斯联科技集团有限公司
Priority date: 2020-05-14
Filing date: 2020-12-04
Publication date: 2021-11-18
Also published as: CN111711655A

Abstract

Disclosed are a blockchain-based electronic data evidence preservation method and system, and a storage medium and a terminal. The method comprises: a client receiving an electronic data evidence preservation request and sending the electronic data evidence preservation request to a server; the server receiving the electronic data evidence preservation request, generating a random character string, and sending the random character string to the client; the client acquiring electronic data, splicing the electronic data with the random character string to generate spliced data, calculating a hash value of the spliced data, generating an evidence preservation parameter set of the electronic data, and sending the evidence preservation parameter set to the server; and the server receiving the evidence preservation parameter set, calculating a root hash value corresponding to a Merkle tree of the evidence preservation parameter set, so as to generate transaction data, and broadcasting the transaction data to a blockchain. Therefore, by using the embodiments of the present application, the blockchain data evidence preservation cost and the risk of data leakage can be reduced.

Description

A blockchain-based electronic data storage method, system, storage medium and terminal

Technical field

The present invention relates to the technical field of blockchain, and in particular to a method, system, storage medium and terminal for electronic data storage based on blockchain.

Background technique

With the continuous development of information modernization, information and data security has become a concern for everyone. In the protection of information and data security, blockchain technology has undoubtedly become the first choice. Blockchain technology uses chained data structures to verify and store data. , Use the distributed node consensus algorithm to generate core update data, and use cryptography to ensure the security of data transmission and access.

At present, in the use of blockchain technology for data storage and certification, it is first necessary to build the underlying blockchain platform by itself, or join a consortium chain formed by several manufacturers, and on this basis, the data uploaded by users is encrypted for storage. Eventually it will be stored in its own "blockchain" or consortium chain node. Since the self-built blockchain network or multiple alliance chains jointly formed are difficult to prevent the possibility of alliance "doing evil" in practice, and the use cost is high, it is not suitable for low-budget customers and low-value data storage scenarios. Uploading data to the platform in the process of transmission, storage, and debugging also increases the risk of data leakage.

Summary of the invention

The embodiments of the application provide a blockchain-based electronic data storage method, system, storage medium, and terminal. In order to have a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not a general comment, nor is it intended to determine key/important elements or describe the scope of protection of these embodiments. Its sole purpose is to present some concepts in a simple form as a prelude to the detailed description that follows.

In the first aspect, the embodiments of the present application provide a blockchain-based electronic data storage method, which is applied to the server, and the method includes:

Receive the deposit information sent from the client and summarize it to generate the deposit information collection;

Combine each of the deposit information in the deposit information set to generate a Merkel tree of the deposit information;

Calculating the root hash value corresponding to the Merkel tree of the evidence information;

Generate transaction data according to the root hash value and broadcast the transaction data to the blockchain.

Optionally, after the generating transaction data according to the root hash value and broadcasting the transaction data to the blockchain, the method further includes:

When the transaction data is successfully broadcast to the blockchain, a broadcast success message is generated and sent to the client.

In the second aspect, an embodiment of the present application provides a blockchain-based electronic data storage method, which is applied to a client, and the method includes:

Receive the input electronic data storage instruction, send the electronic data storage request to the server and receive the random character string returned from the server;

Access to electronic data;

Splicing the random character string and the electronic data to generate spliced certificate data;

Calculate the hash value corresponding to the spliced certificate data and send the hash value to the server as the certificate information.

Optionally, after calculating the hash value corresponding to the spliced attestation data and sending the hash value to the server as attestation information, the method further includes:

Receive broadcast success information, and send parameter information download instructions to the server;

After downloading the parameter information of the electronic data, the parameter combination is performed to generate a deposit certificate.

In the third aspect, the embodiments of the present application provide a blockchain-based electronic data storage method, the method includes:

The client receives the electronic data storage request and sends the electronic data storage request to the server;

The server receives the electronic data storage certificate request, generates a random string and sends it to the client;

The client obtains electronic data and splices the electronic data with the random character string to generate spliced data, calculates the hash value of the spliced data, generates a set of electronic data attestation parameters, and sends it to the server;

The server receives the deposit certificate parameter set and calculates the root hash value corresponding to the Merkel tree of the deposit parameter set to generate transaction data and broadcast the transaction data to the blockchain.

Optionally, after generating the transaction data and broadcasting the transaction data to the blockchain, the method further includes:

According to the successful broadcast of the transaction data, the server generates broadcast success information and sends it to the client;

The client receives the broadcast success information, and sends a parameter information download instruction to the server;

The server downloads the parameter information of the electronic data and sends it to the client;

The client combines the parameter information to generate a deposit certificate; wherein, the deposit certificate is composed of a server-side random string, a hash value of the deposit data, the Merkel tree of the deposit business, and the blockchain number And transaction number.

Optionally, after said generating the deposit certificate, it further includes:

A hash algorithm is used to calculate whether the hash value of the Merkel tree root node in the deposit certificate is consistent with the hash value of the Merkel tree root node stored in the blockchain, and the integrity of the Merkel tree is checked ；

Using a hash algorithm to calculate the hash value of the new data after the random value in the deposit certificate and the data are spliced;

According to whether the hash value corresponding to the random value of the certificate voucher in the Merkel tree stored in the blockchain is consistent with the hash value of the new data, the data integrity is checked.

In a fourth aspect, an embodiment of the present application provides a blockchain-based electronic data storage system, the system includes:

The request sending module is used for the client to receive the electronic data storage request and send the electronic data storage request to the server;

A random character string generation module, used for the server to receive the electronic data storage request, generate a random character string and send it to the client;

The parameter sending module is used for the client to obtain electronic data and splice the electronic data with the random character string to generate spliced data, calculate the hash value of the spliced data, generate a set of electronic data attestation parameters, and send it to the service end;

The data broadcasting module is used for the server to receive the certificate parameter set and calculate the root hash value corresponding to the Merkel tree of the certificate parameter set to generate transaction data and broadcast the transaction data to the blockchain .

In a fifth aspect, an embodiment of the present application provides a computer storage medium, the computer storage medium stores a plurality of instructions, and the instructions are suitable for being loaded by a processor and executing the above method steps.

In a sixth aspect, an embodiment of the present application provides a terminal, which may include a processor and a memory; wherein the memory stores a computer program, and the computer program is adapted to be loaded by the processor and execute the above method steps.

The technical solutions provided by the embodiments of the present application may include the following beneficial effects:

In the embodiment of this application, the system first receives the electronic data storage request through the client, sends the electronic data storage request to the server, and then receives the electronic data storage request through the server, generates a random string and sends it to the client Then, obtain electronic data through the client and splice the electronic data with the random string to generate spliced data, calculate the hash value of the spliced data, generate a set of electronic data attestation parameters, and send it to the server, Finally, the server receives the deposit parameter set and calculates the root hash value corresponding to the Merkel tree of the deposit parameter set to generate transaction data and broadcast the transaction data to the blockchain. Since this application uses the existing mature blockchain network to provide data storage services, by using the largest blockchain network in reality (larger scale means more security), you can make full use of the blockchain's data tamper-proof capability , Without the need to build a self-built blockchain network, by organizing and summarizing the deposit request to reduce the user's deposit cost, and at the same time reduce the risk level of data leakage.

It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present invention.

Description of the drawings

The drawings here are incorporated into the specification and constitute a part of the specification, show embodiments consistent with the present invention, and together with the specification are used to explain the principle of the present invention.

Fig. 1 is a schematic flowchart of a blockchain-based electronic data storage method provided by an embodiment of the present application;

2 is a schematic diagram of the system architecture of a blockchain-based electronic data storage system provided by an embodiment of the present application;

FIG. 3 is a schematic diagram of a Merkel tree composed of deposit information received within a time period provided by an embodiment of the present application;

FIG. 4 is a schematic diagram of a deposit certificate format of a deposit certificate provided by an embodiment of the present application;

FIG. 5 is a schematic structural diagram of a deposit certificate data structure of a deposit certificate provided by an embodiment of the present application;

Fig. 6 is a system schematic diagram of a blockchain-based electronic data storage system provided by an embodiment of the present application;

FIG. 7 is a schematic structural diagram of a terminal provided by an embodiment of the present application.

Detailed ways

The following description and drawings fully illustrate specific embodiments of the present invention to enable those skilled in the art to practice them.

It should be clear that the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

When the following description refers to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementation manners described in the following exemplary embodiments do not represent all implementation manners consistent with the present invention. Rather, they are merely examples of systems and methods consistent with some aspects of the present invention as detailed in the appended claims.

In the description of the present invention, it should be understood that the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance. For those of ordinary skill in the art, the specific meanings of the above-mentioned terms in the present invention can be understood in specific situations. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more. "And/or" describes the association relationship of the associated objects, indicating that there can be three types of relationships, for example, A and/or B, which can mean: A alone exists, A and B exist at the same time, and B exists alone. The character "/" generally indicates that the associated objects before and after are in an "or" relationship.

So far, for electronic data storage certificates based on blockchain, it is first necessary to build the underlying blockchain platform by itself, or join a consortium chain formed by several manufacturers, and encrypt the data uploaded by users on this basis. Finally, User data is finally stored in its own "blockchain" or alliance chain nodes. Since the self-built blockchain network or multiple alliance chains jointly formed are difficult to prevent the possibility of alliance "doing evil" in practice, and the use cost is high, it is not suitable for low-budget customers and low-value data storage scenarios. Uploading data to the platform in the process of transmission, storage, and debugging also increases the risk of data leakage. To this end, this application provides a blockchain-based electronic data storage method, system, storage medium, and terminal to solve the above-mentioned related technical problems. In the technical solution provided by this application, since this application uses the existing mature blockchain network to provide data storage services, by using the largest-scale blockchain network in reality (larger scale means more secure), you can make full use of The data tamper-proof ability of the block chain, without the need to build a block chain network by itself, through the organization and summary of the deposit request to reduce the user's deposit cost, and at the same time reduce the risk level of data leakage, the following is an example The examples are described in detail.

In the following, the blockchain-based electronic data storage method provided by the embodiments of the present application will be described in detail with reference to accompanying drawings 1 to 5. The method can be implemented by relying on a computer program, and can be run on a blockchain-based electronic data storage system based on the von Neumann system. The computer program can be integrated in the application or run as an independent tool application. Among them, the client corresponding to the blockchain-based electronic data storage system in the embodiment of the present application may be a user terminal, including but not limited to: personal computers, tablet computers, handheld devices, vehicle-mounted devices, wearable devices, and computing devices Or other processing equipment connected to a wireless modem, etc. User terminals can be called different names in different networks, such as: user equipment, access terminal, user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication Devices, user agents or user systems, cellular phones, cordless phones, personal digital assistants (PDAs), terminal devices in 5G networks or future evolution networks, etc.

Please refer to FIG. 1, which provides a schematic flowchart of a blockchain-based electronic data storage method for an embodiment of this application. As shown in FIG. 1, the method of the embodiment of the present application may include the following steps:

S101: The client receives the electronic data storage request, and sends the electronic data storage request to the server;

Among them, the client and the server constitute the electronic data storage system of this scheme. The electronic storage system is shown in Figure 2. The system includes the server and the client (not including the blockchain network). The server is composed of the district The blockchain network is composed of docking services and proxy sub-services. The blockchain network is only used to receive transaction data sent by the server. Electronic data storage is the solidification and preservation of electronic data, so that electronic evidence can meet the requirements of legal admissibility, that is, electronic data can be evidenced.

Usually, the client of the deposit certificate system is the user terminal, and the server is composed of the blockchain network docking service and one or more proxy sub-services. Among them, the blockchain docking service, on the one hand, forms a Merkel Tree (Merkel Tree) with the evidence information of user data collected by the proxy sub-service, and then calculates the root hash value of the Merkel Tree. On the other hand, it It is equivalent to a client of the blockchain network, which stores the calculated root hash value in the transaction data and broadcasts the transaction data to the blockchain, but does not participate in the competition for accounting rights (ie, mining). The function of the proxy sub-service is to respond to the client's deposit request and upload the deposit information for a period of time to the blockchain docking service.

Therefore, the entire server implements these functions: summarize the deposit information, calculate a batch of Merkel Tree of deposit information, and promote the successful storage of the deposit business in the blockchain.

In this embodiment of the application, when there is a deposit request, the client initiates a deposit request to the proxy sub-service in the server in a wired or wireless manner.

In a possible implementation manner, the user first triggers the electronic data storage request through the client (user terminal), and when the request is triggered, the user terminal generates the storage instruction and sends it to the server in a wired or wireless manner.

For example, when the user Xiaoming wants to perform electronic data storage for a file saved by the user terminal, Xiaoming first selects a specified electronic file on the user terminal, and then triggers an electronic storage request for the electronic file through the user terminal. When the user terminal detects the storage After the certificate request is triggered, the user terminal generates an electronic deposit request instruction and sends it to the server in a wired or wireless manner.

S102: The server receives the electronic data storage request, generates a random character string, and sends it to the client;

Among them, the random character string is generated by the server through any combination of characters.

In the embodiment of the present application, the proxy sub-service of the server receives the electronic deposit request, and then obtains multiple characters through an internal preset program for combination, generates a random character string and sends it to the user terminal in a wired or wireless manner.

In a possible implementation, when the proxy sub-service of the server receives the electronic data storage request instruction from the user terminal, it first obtains the preset random string generation program, and then according to the preset random string The generating program obtains multiple character strings for random combination, generates a random character string after the combination is completed, and finally sends the generated random character string to the user terminal in a wired or wireless manner.

S103: The client obtains electronic data and splices the electronic data with the random character string to generate spliced data, calculates a hash value of the spliced data, generates a set of electronic data attestation parameters, and sends it to the server;

In a possible implementation, the user terminal receives the random character string sent by the server. After receiving the random character string, first obtain the stored electronic data through the string splicing program of the client, and then combine the electronic data with the received random string. The string is spliced, and the spliced data is generated after the splicing is completed. The user terminal calculates the hash value of the spliced data according to the generated spliced data to generate the attestation parameter set of the electronic data, and finally the attestation parameter set of the electronic data is wireless or Send to the server in a wired way.

S104: The server receives the deposit certificate parameter set and calculates the root hash value corresponding to the Merkel tree of the deposit parameter set to generate transaction data and broadcast the transaction data to the blockchain.

In a possible implementation, the proxy sub-service of the server receives the deposit information for a period of time, and then uploads the deposit information for a period of time to the blockchain docking service of the server, and the blockchain docking service receives a period of time. After the deposit information within a period of time (that is, the random value generated by the server and the hash value calculated accordingly), the deposit information for a period of time is formed into a leaf node of a Merkel Tree (Merkel Tree), such as the graph As shown in 3, the root hash value of the Merkel Tree is calculated through a preset algorithm, and finally the root hash value of the Merkel Tree is stored in the transaction data and the transaction data is broadcast to the blockchain. Among them, this Merkel Tree is used as a part of the deposit certificate and is ultimately saved by the user.

Further, when the transaction data is broadcast successfully, the server first generates the broadcast success message and sends it to the client, then the client receives the broadcast success message, sends a parameter information download instruction to the server, and the server downloads the parameter information of the electronic data and sends it to The client, and finally the client combines the parameter information to generate a certificate. Among them, the deposit certificate is composed of a random string of the server, the hash value of the deposit data, the Merkel tree of the deposit service, the blockchain number and the transaction number, as shown in Figures 4 and 5.

Further, when the data integrity check is performed, a hash algorithm is first used to calculate the random value in the deposit certificate and the hash value of the new data after the data is spliced, and then according to the Merkel tree stored in the blockchain Whether the hash value corresponding to the random value of the deposit certificate is consistent with the hash value of the new data, the data integrity is checked.

Specifically, Figures 4 and 5 show the main parameters of the deposit information and the storage format of the data certificate on the user side. When the client initiates a certificate deposit request to the server, the server returns a random value to the client (the form can be a random string), and the client concatenates the obtained random value and the certificate data in the memory, and calculates the result of the splicing The hash value (users can choose one of the recognized hash algorithms for calculation), and this hash value will be sent to the server. After the server successfully saves the transaction information to the blockchain, the client downloads the entire Merkel Tree data of this batch of deposit certificates, as well as the block number, transaction number, etc. from the server. The client can use the structure described in Figure 5 to save the deposit certificate as a file.

When the integrity of user data needs to be checked, the integrity of the Merkel tree and the integrity of the data need to be checked separately. When verifying the integrity of the Merkel tree, first find the hash value of the root node of the Merkel Tree that was saved from the transaction information disclosed by the blockchain according to the blockchain parameters in the certificate, and then according to the Merkel tree in the certificate. Tree and the hash algorithm published by the service can check the integrity of Merkel Tree, that is, to determine whether the calculated root hash value is consistent with the one stored in the blockchain. If it is consistent, it means that Merkel Tree has not been tampered with. Finally, the integrity of the data is checked. When checking the integrity of the data, first use the hash algorithm selected by the user recorded in the voucher, and calculate the random value in the voucher and the hash value of the new data after the data is spliced by the selected hash algorithm. If the result obtained is consistent with the hash value corresponding to the random value in Merkel Tree, it can indicate that the file is intact and has not been tampered with.

The following are system embodiments of the present invention, which can be used to implement the method embodiments of the present invention. For details not disclosed in the system embodiment of the present invention, please refer to the method embodiment of the present invention.

Please refer to FIG. 6, which shows a schematic structural diagram of a blockchain-based electronic data storage system provided by an exemplary embodiment of the present invention. The blockchain-based electronic data storage system can be implemented as all or part of the terminal through software, hardware or a combination of both. The system 1 includes a request sending module 10, a random character string generating module 20, a parameter sending module 30, and a data broadcasting module 40.

The request sending module 10 is used for the client to receive the electronic data storage request and send the electronic data storage request to the server;

The random character string generation module 20 is used for the server to receive the electronic data storage request, generate a random character string and send it to the client;

The parameter sending module 30 is used for the client to obtain electronic data and splice the electronic data with the random character string to generate spliced data, calculate the hash value of the spliced data, generate a set of evidence parameters of the electronic data, and send it to Server;

The data broadcasting module 40 is used for the server to receive the deposit parameter set and calculate the root hash value corresponding to the Merkel tree of the deposit parameter set to generate transaction data and broadcast the transaction data to the block chain.

It should be noted that, when the blockchain-based electronic data storage system provided in the above embodiment executes the blockchain-based electronic data storage method, only the division of the above-mentioned functional modules is used for illustration. In actual applications, The above-mentioned function allocation can be completed by different function modules according to needs, that is, the internal structure of the device is divided into different function modules to complete all or part of the functions described above. In addition, the block chain-based electronic data storage system provided in the above-mentioned embodiment and the block chain-based electronic data storage method embodiment belong to the same concept, and the implementation process is detailed in the method embodiment, which will not be repeated here.

The serial numbers of the foregoing embodiments of the present application are only for description, and do not represent the superiority or inferiority of the embodiments.

The present invention also provides a computer-readable medium on which program instructions are stored, and when the program instructions are executed by a processor, the block chain-based electronic data storage method provided by the foregoing method embodiments is implemented.

The present invention also provides a computer program product containing instructions, which when run on a computer, causes the computer to execute the blockchain-based electronic data storage method described in the foregoing method embodiments.

Refer to FIG. 7, which provides a schematic structural diagram of a terminal according to an embodiment of the present application. As shown in FIG. 7, the terminal 1000 may include: at least one processor 1001, at least one network interface 1004, a user interface 1003, a memory 1005, and at least one communication bus 1002.

Among them, the communication bus 1002 is used to implement connection and communication between these components.

The user interface 1003 may include a display screen (Display) and a camera (Camera), and the optional user interface 1003 may also include a standard wired interface and a wireless interface.

Among them, the network interface 1004 may optionally include a standard wired interface and a wireless interface (such as a WI-FI interface).

The processor 1001 may include one or more processing cores. The processor 1001 uses various excuses and lines to connect various parts of the entire electronic device 1000, and executes by running or executing instructions, programs, code sets, or instruction sets stored in the memory 1005, and calling data stored in the memory 1005. Various functions and processing data of the electronic device 1000. Optionally, the processor 1001 may adopt at least one of digital signal processing (Digital Signal Processing, DSP), Field-Programmable Gate Array (Field-Programmable Gate Array, FPGA), and Programmable Logic Array (Programmable Logic Array, PLA). A kind of hardware form to realize. The processor 1001 may integrate one or a combination of a central processing unit (CPU), a graphics processing unit (GPU), a modem, and the like. Among them, the CPU mainly processes the operating system, user interface, and application programs; the GPU is used to render and draw the content that needs to be displayed on the display screen; the modem is used to process wireless communication. It is understandable that the above-mentioned modem may not be integrated into the processor 1001, but may be implemented by a chip alone.

The memory 1005 may include random access memory (Random Access Memory, RAM), and may also include read-only memory (Read-Only Memory). Optionally, the memory 1005 includes a non-transitory computer-readable storage medium. The memory 1005 may be used to store instructions, programs, codes, code sets or instruction sets. The memory 1005 may include a program storage area and a data storage area, where the program storage area may store instructions for implementing the operating system and instructions for at least one function (such as touch function, sound playback function, image playback function, etc.), Instructions and the like used to implement the above method embodiments; the storage data area can store the data and the like involved in the above method embodiments. Optionally, the memory 1005 may also be at least one storage system located far away from the foregoing processor 1001. As shown in FIG. 7, the memory 1005 as a computer storage medium may include an operating system, a network communication module, a user interface module, and a blockchain-based electronic data storage application program.

In the terminal 1000 shown in FIG. 7, the user interface 1003 is mainly used to provide an input interface for the user to obtain the data input by the user; and the processor 1001 can be used to call the block chain-based electronic data storage stored in the memory 1005. Approval application, and specifically perform the following operations:

Access to electronic data;

In an embodiment, after the processor 1001 executes the calculation of the hash value corresponding to the spliced attestation data and sends the hash value as attestation information to the server, it also performs the following operations:

In one embodiment, the processor 1001 performs the following operations after performing the parameter combination after downloading the parameter information of the electronic data, and generating the attestation voucher:

A person of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be implemented by instructing relevant hardware through a computer program. The program can be stored in a computer-readable storage medium. When executed, it may include the procedures of the above-mentioned method embodiments. Wherein, the storage medium can be a magnetic disk, an optical disc, a read-only storage memory, or a random storage memory, etc.

The above-disclosed are only preferred embodiments of this application, and of course the scope of rights of this application cannot be limited by this. Therefore, equivalent changes made in accordance with the claims of this application still fall within the scope of this application.

Claims

A blockchain-based electronic data storage method applied to a server, characterized in that the method includes:

Receive the deposit information sent from the client and summarize it to generate the deposit information collection;

Combine each of the deposit information in the deposit information set to generate a Merkel tree of the deposit information;

Calculating the root hash value corresponding to the Merkel tree of the evidence information;

Generate transaction data according to the root hash value and broadcast the transaction data to the blockchain.
The method according to claim 1, wherein after generating transaction data according to the root hash value and broadcasting the transaction data to a blockchain, the method further comprises:

When the transaction data is successfully broadcast to the blockchain, a broadcast success message is generated and sent to the client.
A blockchain-based electronic data storage method, applied to a client, is characterized in that the method includes:

Receive the input electronic data storage instruction, send the electronic data storage request to the server and receive the random character string returned from the server;

Access to electronic data;

Splicing the random character string and the electronic data to generate spliced certificate data;

Calculate the hash value corresponding to the spliced certificate data and send the hash value to the server as the certificate information.
The method according to claim 3, wherein after calculating the hash value corresponding to the spliced attestation data and sending the hash value to the server as attestation information, the method further comprises:

Receive broadcast success information, and send parameter information download instructions to the server;

After downloading the parameter information of the electronic data, the parameter combination is performed to generate a deposit certificate.
A blockchain-based electronic data storage method, characterized in that, the method includes:

The client receives the electronic data storage request and sends the electronic data storage request to the server;

The server receives the electronic data storage certificate request, generates a random string and sends it to the client;

The client obtains electronic data and splices the electronic data with the random character string to generate spliced data, calculates the hash value of the spliced data, generates a set of electronic data attestation parameters, and sends it to the server;

The server receives the deposit certificate parameter set and calculates the root hash value corresponding to the Merkel tree of the deposit parameter set to generate transaction data and broadcast the transaction data to the blockchain.
The method according to claim 5, wherein after the generating transaction data and broadcasting the transaction data to the blockchain, the method further comprises:

According to the successful broadcast of the transaction data, the server generates broadcast success information and sends it to the client;

The client receives the broadcast success information, and sends a parameter information download instruction to the server;

The server downloads the parameter information of the electronic data and sends it to the client;

The client combines the parameter information to generate a deposit certificate; wherein, the deposit certificate is composed of a server-side random string, a hash value of the deposit data, the Merkel tree of the deposit business, and the blockchain number And transaction number.
The method according to claim 6, characterized in that, after said generating a deposit certificate, it further comprises:

A hash algorithm is used to calculate whether the hash value of the Merkel tree root node in the deposit certificate is consistent with the hash value of the Merkel tree root node stored in the blockchain, and the integrity of the Merkel tree is checked ；

Using a hash algorithm to calculate the hash value of the new data after the random value in the deposit certificate and the data are spliced;

According to whether the hash value corresponding to the random value of the certificate voucher in the Merkel tree stored in the blockchain is consistent with the hash value of the new data, the data integrity is checked.
A blockchain-based electronic data storage system, characterized in that, the system includes:

The request sending module is used for the client to receive the electronic data storage request and send the electronic data storage request to the server;

A random character string generation module, used for the server to receive the electronic data storage request, generate a random character string and send it to the client;

The parameter sending module is used for the client to obtain electronic data and splice the electronic data with the random character string to generate spliced data, calculate the hash value of the spliced data, generate a set of electronic data attestation parameters, and send it to the service end;

The data broadcasting module is used for the server to receive the certificate parameter set and calculate the root hash value corresponding to the Merkel tree of the certificate parameter set to generate transaction data and broadcast the transaction data to the blockchain .
A computer storage medium, wherein the computer storage medium stores a plurality of instructions, and the instructions are suitable for being loaded by a processor and executing the method steps according to any one of claims 1-7.
A terminal, comprising: a processor and a memory; wherein the memory stores a computer program, and the computer program is suitable for being loaded by the processor and executing the method according to any one of claims 1-7 step.