CN114499824A - A node system of blockchain and its cooperation method - Google Patents

Abstract

The invention provides a block chain node system and a cooperation method thereof, and relates to the field of block chain. The system includes: a three-level block chain network composed of a departmental sub-chain, a city main chain and a provincial main chain, and a data Connection backend; wherein, the provincial main chain includes several city nodes, each city node is connected to a corresponding city main chain through the data connection backend, and each city main chain is communicatively connected to a A number of the department sub-chains; the city main chain and the department sub-chains connected to it by communication constitute a city main sub-chain system corresponding to the city node, and the data connection background is used for the corresponding city main sub-chain system. notarization. The invention is based on the three-level blockchain network of each city, and establishes a provincial-level alliance chain at the same time, realizes the joint management of nodes in various cities, and promotes the connectivity of urban data.

Description

A node system of blockchain and its cooperation method

technical field

The invention relates to the technical field of blockchain, and in particular, to a node system of a blockchain and a cooperation method thereof.

Background technique

Blockchain is essentially a shared database, and the data or information stored in it has the characteristics of "unforgeable", "full traces", "traceable", "open and transparent" and "collective maintenance". Based on these characteristics, blockchain technology has laid a solid "trust" foundation, created a reliable "cooperation" mechanism, and has broad application prospects. A blockchain is a type of distributed ledger. A blockchain is an independent ledger, and two different chains are two different independent ledgers. The two ledgers are not related. In essence, there is no way to transfer the value between the ledgers, but for a specific user, the user The value stored on one blockchain can become the value on another chain, which is the circulation of value.

At this stage, the blockchain technology has problems such as inconsistent technical standards and insufficient maturity of the technical architecture. For example, government departments build independently, which may easily cause problems such as repeated system construction and data sharing, which consumes a lot of manpower, material resources and time costs.

SUMMARY OF THE INVENTION

In view of this, the present invention provides a block chain node system and a cooperation method thereof to solve all or one of the problems in the prior art.

Based on the above purpose, the present invention provides a blockchain node system, including:

A three-level blockchain network composed of departmental sub-chains, city main chains and provincial main chains, as well as the data connection backend;

Among them, the provincial main chain includes several city nodes, each city node is connected to a corresponding city main chain through the data connection background, and each city main chain is communicatively connected to several department sub-chain;

The city main chain and the department sub-chains communicatively connected to it constitute a city main sub-chain system corresponding to the city node, and the data connection background is used to notarize the corresponding city main sub-chain system.

Optionally, the department sub-chain is composed of several business departments, and the department sub-chain includes:

The on-chain resource management module is used to manage the organizations, nodes and smart contracts associated with the sub-chain of the department;

The business function module is used to process the data of the department sub-chain;

The cross-chain request module is used to initiate cross-chain requests when cross-chain requirements are generated.

Optionally, the business function module specifically includes:

On-chain unit, used for data on-chain processing;

a calling unit for calling the smart contract in the sub-chain of the department;

The processing unit is used for processing the smart contract.

Optionally, the city main chain includes:

The organization management module is used to join the organization corresponding to the city main chain and manage the organization information;

a sub-chain management module, used to manage each of the department sub-chains connected to the main chain of the city;

This chain management module is used to manage the organizations, nodes and smart contracts associated with the city main chain;

The first communication module is used for coordinating the cross-chain communication between the sub-chains of each department of the city main chain communication connection, providing a channel for cross-chain communication, and coordinating and supervising the cross-chain communication.

Optionally, the provincial main chain includes:

The city management module is used to manage the added cities and obtain the overall operation of the city main chain system corresponding to each city node;

The second communication module is used to provide a channel for cross-chain communication when the cross-chain request is a cross-city cross-chain request, and to coordinate and supervise the cross-chain communication.

Optionally, the data connection background includes:

The data collection module is used to obtain the data on the city main chain and submit it to the provincial main chain;

The third communication module is used to provide a channel for cross-chain communication when the cross-chain request is a cross-city cross-chain request, and to coordinate and supervise cross-chain communication;

The background management module is used to provide the blockchain-as-a-service management background of the provincial main chain.

Optionally, the department sub-chain further includes:

The first anchoring module is used to package the on-chain data of the department sub-chain into a merkle tree and submit it to the corresponding city main chain;

The city main chain also includes:

The second anchoring module is used to obtain the merkle tree submitted by the department sub-chain, and submit it to the data connection background.

Optionally, the data connection background further includes:

The third anchoring module is used to obtain the merkle tree submitted by the city main chain and submit it to the provincial main chain.

Optionally, the provincial main chain further includes:

The fourth anchoring module is used to obtain the merkle tree submitted by the data connection background, and perform credit evaluation based on the merkle tree.

Further, the present invention also provides a collaboration method for a node system of a blockchain, comprising the following steps:

The departmental sub-chain processes its data, and initiates a cross-chain request when a cross-chain demand is generated;

Based on the cross-chain request, the city main chain coordinates cross-chain communication between each of the department sub-chains connected to the city main chain communication, provides channels for cross-chain communication, and coordinates and supervises cross-chain communication. ;

When the cross-chain request is a cross-city cross-chain request, the data connection backend and the provincial main chain provide a channel for cross-chain communication, as well as coordination and supervision during cross-chain communication, linking the chain of the city main chain The above data is submitted to the provincial main chain.

Further, the present invention also provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and running on the processor, and when the processor executes the program, any one of the above-mentioned programs is implemented. Steps of the collaborative method of the node system of the blockchain.

Further, the present invention also provides a non-transitory computer-readable storage medium on which a computer program is stored, and when the computer program is executed by a processor, realizes the cooperation method of the node system of any of the above-mentioned blockchains A step of.

Further, the present invention also provides a computer program product, including a computer program, when the computer program is executed by a processor, the steps of the cooperation method of the node system of any of the above-mentioned blockchains are implemented.

It can be seen from the above that the blockchain node system and its cooperation method provided by the present invention are based on the three-level blockchain network of each city, and at the same time establish a provincial-level alliance chain, realize the joint management of nodes in various cities, and promote the city The interconnection of data realizes the collaboration between government departments at all levels, cities, enterprises and various links of enterprises, and solves the problem of insufficient data sharing between provinces and cities, between localities, between enterprises and governments, and between departments , reduce the waste of social resources, and meet the cross-chain business needs of each application sub-chain or between application sub-chains.

Description of drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying 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 These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to these drawings without creative efforts.

1 is a schematic structural diagram of a node system of the blockchain of the present invention;

FIG. 2 is a schematic structural diagram of a sector sub-chain in the node system of the blockchain of the present invention;

3 is a schematic structural diagram of a city main chain in the node system of the blockchain of the present invention;

Fig. 4 is the specific structural schematic diagram of the provincial main chain in the node system of the blockchain of the present invention;

5 is a schematic structural diagram of a data connection background in the node system of the blockchain of the present invention;

6 is a schematic diagram of the application of the node system of the blockchain of the present invention to a cross-chain request in the city;

7 is a schematic diagram of the application of the node system of the blockchain of the present invention to a cross-city cross-chain request;

FIG. 8 is a schematic flowchart of the cooperation method of the node system of the blockchain of the present invention;

FIG. 9 is a schematic structural diagram of an electronic device provided by the present invention.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

It should be noted that, unless otherwise defined, the technical or scientific terms used in the embodiments of the present invention shall have the usual meanings understood by those with ordinary skill in the art to which the present disclosure belongs. As used in this disclosure, "first," "second," and similar terms do not denote any order, quantity, or importance, but are merely used to distinguish the various components. "Comprises" or "comprising" and similar words mean that the elements or things appearing before the word encompass the elements or things recited after the word and their equivalents, but do not exclude other elements or things. Words like "connected" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "Down", "Left", "Right", etc. are only used to represent the relative positional relationship, and when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

As a preferred embodiment of the present invention, the present invention provides a blockchain node system, including:

A three-level blockchain network composed of departmental sub-chains, city main chains and provincial main chains, as well as the data connection backend;

Among them, the provincial main chain includes several city nodes, each city node is connected to a corresponding city main chain through the data connection background, and each city main chain is communicatively connected to several department sub-chain;

The city main chain and the department sub-chains communicatively connected to it constitute a city main sub-chain system corresponding to the city node, and the data connection background is used to notarize the corresponding city main sub-chain system.

Further, the present invention also provides a collaboration method for a node system of a blockchain, comprising the following steps:

The departmental sub-chain processes its data, and initiates a cross-chain request when a cross-chain demand is generated;

Based on the cross-chain request, the city main chain coordinates cross-chain communication between each of the department sub-chains connected to the city main chain communication, provides channels for cross-chain communication, and coordinates and supervises cross-chain communication. ;

When the cross-chain request is a cross-city cross-chain request, the data connection backend and the provincial main chain provide a channel for cross-chain communication, as well as coordination and supervision during cross-chain communication, linking the chain of the city main chain The above data is submitted to the provincial main chain.

The invention is based on a multi-level main-sub-chain cross-chain system and its collaboration method, based on the three-level block chain network of each city, and establishes a provincial-level alliance chain at the same time, realizes the joint management of nodes in various cities, promotes the connectivity of urban data, and realizes the Collaboration between government-level agencies, cities, enterprises, and all aspects of enterprises, to solve the problem of insufficient data sharing between provinces and cities, between localities, between enterprises and governments, and between departments, reduce social resource waste, and meet the needs of Cross-chain business requirements of each application sub-chain or between application sub-chains.

The preferred embodiments of the node system of the blockchain of the present invention and the cooperation method thereof will be described below with reference to the accompanying drawings.

Referring to FIG. 1, the present invention provides a node system of a blockchain, which includes:

A three-level blockchain network consisting of a departmental sub-chain 100, a city main chain 200 and a provincial main chain 300, and a data connection backend 400.

The provincial main chain 300 includes several city nodes, each city node is connected to a corresponding city main chain 200 through the data connection background 400, and each city main chain 200 is connected to several department sub-chains 100 through communication.

The city main chain 200 and its departmental sub-chains 100 communicatively connected constitute the city main sub-chain system of the corresponding city node, and the data connection background 400 is used to notarize the corresponding city main sub-chain system.

It should be noted that when the application object is a group company, the structure of this three-level blockchain network can also be used to deploy and apply the blockchain underlying network to the group and its subordinate branches and subsidiaries, so as to solve the problem of enterprise problems. The problems of blockchain network management and data interaction between them. In addition, when the network level needs to be expanded, it is only necessary to add the corresponding upper-level management node, and also connect the background 400 through data to perform multi-level expansion of the three-level blockchain network.

The invention is based on a multi-level main and sub-chain cross-chain system, based on the three-level blockchain network of each city, and establishes a provincial-level alliance chain at the same time, realizes the joint management of nodes in various cities, promotes the interconnection of urban data, and realizes all levels of government departments, Collaboration between cities, enterprises and enterprise links to solve the problem of insufficient data sharing between provinces and cities, between localities, between enterprises and governments, and between departments, reduce social resource waste, and meet the needs of various application sub-chains Or apply cross-chain business requirements between sub-chains.

Please refer to FIG. 2 , the department sub-chain 100 is composed of several business departments, and the department sub-chain 100 includes:

The on-chain resource management module 110 is used to manage the organizations, nodes and smart contracts associated with the sub-chain of the department.

The business function module 120 is used to process the data of the department sub-chain 100 . In this embodiment, the service function module 120 specifically includes:

On-chain unit, used for data on-chain processing;

The calling unit is used to call the smart contract in the sub-chain of the department, and the smart contract can be customized by the relevant user;

A processing unit for processing smart contracts;

It should be noted that other related processing of the data of the department sub-chain 100 is also completed through the business function module 120 .

The cross-chain request module 130 is configured to initiate a cross-chain request when a cross-chain requirement is generated.

The first anchoring module 140 is used to package the on-chain data of the departmental sub-chain 100 into a merkle tree and submit it to the corresponding city main chain 200 . Based on the submitted mekle tree, the credit of each city sub-chain can be improved.

See Figure 3, City Master, 200 includes:

The organization management module 210 is used to join the organization corresponding to the city main chain 200 and manage the organization information.

The sub-chain management module 220 is used to manage each department sub-chain connected by the communication of the city main chain 200, so as to grasp the operation information of each department sub-chain 100, including but not limited to the number of department sub-chains 100, department sub-chains 100 each participate in the organization, information of each department sub-chain 100, etc.

The local chain management module 230 is used to manage the organizations, nodes and smart contracts associated with the city main chain 200.

The first communication module 240 is used for coordinating cross-chain communication among the sub-chains 100 of various departments connected by the communication of the city main chain 200, providing a channel for cross-chain communication, and coordinating and supervising the cross-chain communication.

The second anchoring module 250 is configured to obtain the merkle tree submitted by the department sub-chain 100 and submit it to the data connection background 400 .

Referring to Figure 4, the provincial main chain 300 includes:

The city management module 310 is used to manage the joined city grounds, and obtain the overall operation status of the city main sub-chain system corresponding to each city node;

The second communication module 320 is configured to provide a channel for cross-chain communication when the cross-chain request is a cross-city cross-chain request, and to coordinate and supervise the cross-chain communication.

The fourth anchoring module 330 is configured to acquire the merkle tree submitted by the data connection backend 400, and perform credit evaluation based on the merkle tree.

The provincial main chain 300 can not only accommodate the joining of city nodes, but also the joining of the city main and sub-chain homogenous network.

Please refer to Figure 5. The data connection backend 400 is used to connect the city main chain 200 and the provincial main chain 200. The data connection backend 400 acts as a participant of the two chains, becomes the connection hub of the two chains, and acts as a cross-chain notarization Human role, the data connection backend 400 includes:

The data collection module 410 is used to obtain or collect the data on the city main chain 200 and submit it to the provincial main chain 300, such as a list of participating departments of the city main chain and sub-chains, a list of sub-chains created on the city, and so on.

The third communication module 420 is used to provide a channel for cross-chain communication when the cross-chain request is a cross-city cross-chain request, and to coordinate and supervise the cross-chain communication. When a cross-chain event occurs, the data connection backend 400 needs to determine whether it is a cross-city cross-chain requirement of the cross-city main chain and sub-chain. If so, the requirement needs to be submitted to the provincial main chain 300, and the provincial main chain 300 will route the request. It is then passed to the city main sub-chain system of the target city.

The background management module 430 is used to provide the blockchain-as-a-service management background of the provincial main chain 300 . Including various management functions on the provincial main chain 300, such as the addition of new city grounding, node monitoring, and deployment of new chain codes, etc., need to be presented and processed on the background management module 430. The city main sub-chain of each city node An overview of the system also needs to be presented in the background management module 430 .

The third anchoring module 440 is used to obtain the merkle tree submitted by the city main chain 200 and submit it to the provincial main chain 300 .

The system can be applied to the two cross-chain scenarios of intra-city cross-chain and cross-city cross-chain shown in Figure 6 and Figure 7 respectively. In the scenario shown in Figure 6 where the cross-chain request is an intra-city cross-chain, the intra-city cross-chain only needs to complete the cross-chain process in the main sub-chain system of the city. The specific process is: under the city main chain 200, The sub-chain of department A initiates a cross-chain request, and the request will be transmitted to the corresponding city main chain 200 by the cross-chain node on the sub-chain; the data connection background 400 monitors the cross-chain request, and it only needs to acquire and know the cross-chain request It is enough to cross-chain within the city's main chain system, so no processing will be done; after that, the cross-chain node on the city department B sub-chain connected to the city's main chain 200 listens to what happens on the city's main chain 200, and the target is this sub-chain After the cross-chain request is received, the cross-chain request is processed reasonably and submitted to the sub-chain of department B to complete the cross-chain. Therefore, in the scenario where the cross-chain request is an intra-city cross-chain, it needs to go through the following links: the initiator's city sub-chain → the common city main chain of the initiator and the target → the target's city sub-chain.

In the scenario shown in Figure 7 where the cross-chain request is a cross-city cross-chain, the cross-city cross-chain needs to transmit the cross-chain request to the provincial main chain 300, and the provincial main chain 300 is used as the channel to reach the target city. The city main sub-chain system, that is, the corresponding target sub-chain, the specific process is: the department A sub-chain of the initiator city initiates a cross-chain request, and the cross-chain node on the sub-chain sends the cross-chain request to the initiator's city main chain 200; After the data connection background 400 of the initiator city monitors the cross-chain request, it determines that this is a cross-city cross-chain request, which needs to be processed by the provincial main chain 300, so it is submitted to the initiator of the provincial main chain 300 City node; the data connection background 400 of the target city monitors all cross-chain requests on the provincial main chain 300 at any time, and submits the request to the target city's department B sub-chain when it is found that the target of the request is the sub-chain of department B of the target city. City main chain 200; after the cross-chain node of the department B sub-chain of the target city listens to the cross-chain request of the target sub-chain on the city main chain 200 of the target party, it submits the cross-chain request to the department B sub-chain chain, complete the cross-chain. Therefore, in the scenario where the cross-chain request is a cross-city cross-chain, it needs to go through the following links: initiator city sub-chain → initiator city main chain → provincial sub-chain → target city main chain → target city sub-chain.

Referring to FIG. 8 , the present invention provides a method for cooperating with a node system of a blockchain, which includes:

S100. The departmental sub-chain processes its data, and initiates a cross-chain request when a cross-chain demand is generated;

S200. Based on the cross-chain request, the city main chain coordinates cross-chain communication between the sub-chains of various departments connected by the city main chain communication, and provides channels for cross-chain communication, as well as coordination and supervision during cross-chain communication;

S300. When the cross-chain request is a cross-city cross-chain request, the data connection backend and the provincial main chain provide channels for cross-chain communication, as well as coordination and supervision during cross-chain communication, and submit the on-chain data of the city main chain to Provincial main chain.

FIG. 9 illustrates a schematic diagram of the physical structure of an electronic device. As shown in FIG. 9 , the electronic device may include: a processor (processor) 810, a communication interface (Communications Interface) 820, a memory (memory) 830, and a communication bus 840, The processor 810 , the communication interface 820 , and the memory 830 communicate with each other through the communication bus 840 . The processor 810 can call the logic instructions in the memory 830 to execute the cooperation method of the node system of the blockchain, and the method includes the following steps:

S100, the departmental sub-chain processes its data, and initiates a cross-chain request when a cross-chain demand is generated;

S200. Based on the cross-chain request, the city main chain coordinates cross-chain communication between each of the department sub-chains connected by the city main chain communication, provides channels for cross-chain communication, and coordinates cross-chain communication and regulation;

S300. When the cross-chain request is a cross-city cross-chain request, the data connection backend and the provincial main chain provide a channel for cross-chain communication, as well as coordination and supervision during cross-chain communication, and connect the city main chain The data on the chain is submitted to the provincial main chain.

In addition, the above-mentioned logic instructions in the memory 830 can be implemented in the form of software functional units and can be stored in a computer-readable storage medium when sold or used as an independent product. Based on such understanding, the technical solution of the present invention can be embodied in the form of a software product in essence, or the part that contributes to the prior art or the part of the technical solution. The computer software product is stored in a storage medium, including Several instructions are used to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, Read-Only Memory (ROM, Read-Only Memory), Random Access Memory (RAM, Random Access Memory), magnetic disk or optical disk and other media that can store program codes .

In another aspect, the present invention also provides a computer program product, the computer program product includes a computer program, the computer program can be stored on a non-transitory computer-readable storage medium, and when the computer program is executed by a processor, the computer can The method for executing the cooperation of the node system of the blockchain provided by the above methods includes the following steps:

S100, the departmental sub-chain processes its data, and initiates a cross-chain request when a cross-chain demand is generated;

S200. Based on the cross-chain request, the city main chain coordinates cross-chain communication between each of the department sub-chains connected by the city main chain communication, provides channels for cross-chain communication, and coordinates cross-chain communication and regulation;

S300. When the cross-chain request is a cross-city cross-chain request, the data connection backend and the provincial main chain provide a channel for cross-chain communication, as well as coordination and supervision during cross-chain communication, and connect the city main chain The data on the chain is submitted to the provincial main chain.

In yet another aspect, the present invention also provides a non-transitory computer-readable storage medium on which a computer program is stored, and when the computer program is executed by a processor, is implemented to execute the cooperation of the node systems of the blockchain provided by the above methods method, the method includes the following steps:

S100, the departmental sub-chain processes its data, and initiates a cross-chain request when a cross-chain demand is generated;

S200. Based on the cross-chain request, the city main chain coordinates cross-chain communication between each of the department sub-chains connected by the city main chain communication, provides channels for cross-chain communication, and coordinates cross-chain communication and regulation;

S300. When the cross-chain request is a cross-city cross-chain request, the data connection backend and the provincial main chain provide a channel for cross-chain communication, as well as coordination and supervision during cross-chain communication, and connect the city main chain The data on the chain is submitted to the provincial main chain.

The device embodiments described above are only illustrative, wherein the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in One place, or it can be distributed over multiple network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution in this embodiment. Those of ordinary skill in the art can understand and implement it without creative effort.

From the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a necessary general hardware platform, and certainly can also be implemented by hardware. Based on this understanding, the above-mentioned technical solutions can be embodied in the form of software products in essence or the parts that make contributions to the prior art, and the computer software products can be stored in computer-readable storage media, such as ROM/RAM, magnetic A disc, an optical disc, etc., includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform the methods described in various embodiments or some parts of the embodiments.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that it can still be Modifications are made to the technical solutions described in the foregoing embodiments, or some technical features thereof are equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. A system of blockchain nodes, comprising:

a three-level block chain network consisting of the department subchain, the city main chain and the provincial main chain, and a data connection background;

the provincial main chain comprises a plurality of city nodes, each city node is connected with a corresponding city main chain through the data connection background, and each city main chain is connected with a plurality of department sub-chains in a communication mode;

the city main chain and the department sub-chain in communication connection with the city main chain form a city main sub-chain system corresponding to the city node, and the data connection background is used for notarizing the corresponding city main sub-chain system.

2. The system of blockchain nodes of claim 1, wherein the department sub-chain is comprised of a plurality of business departments, the department sub-chain comprising:

the chain resource management module is used for managing the organization, the nodes and the intelligent contracts related to the department subchains;

the business function module is used for processing the data of the department subchain;

and the cross-chain request module is used for initiating a cross-chain request when a cross-chain requirement is generated.

3. The system of blockchain nodes of claim 2, wherein the service function module specifically comprises:

an uplink unit for performing data uplink processing;

the calling unit is used for calling the intelligent contracts in the department sub-chains;

and the processing unit is used for processing the intelligent contract.

4. A blockchain node system according to claim 3, wherein the city backbone comprises:

the organization management module is used for adding the organization corresponding to the city main chain and managing organization information;

the sub-chain management module is used for managing each department sub-chain in communication connection with the city main chain;

the system comprises a chain management module, a city main chain management module and a city main chain management module, wherein the chain management module is used for managing the related organization, nodes and intelligent contracts of the city main chain;

the first communication module is used for coordinating cross-link communication among the department sub-chains in the city main chain communication connection, providing a channel for the cross-link communication, and coordinating and monitoring the cross-link communication.

5. The system of blockchain nodes of claim 4, wherein the provincial backbone comprises:

the city management module is used for managing the grounding of the added city and acquiring the integral operation condition of the city main-sub chain system corresponding to each city node;

and the second communication module is used for providing a channel for cross-chain communication and coordinating and supervising in cross-chain communication when the cross-chain request is a cross-city cross-chain request.

6. The system of blockchain nodes of claim 5, wherein the data connection back office comprises:

the data collection module is used for acquiring data on the city main chain and submitting the data to the provincial main chain;

the third communication module is used for providing a channel for cross-chain communication and coordinating and monitoring the cross-chain communication when the cross-chain request is a cross-city cross-chain request;

and the background management module is used for providing a block chain of the provincial main chain, namely a service management background.

7. The blockchain node system of claim 6, wherein the department sub-chain further comprises:

the first anchoring module is used for packaging the on-chain data of the department sub-chain into a merkle tree and submitting the merkle tree to the corresponding city main chain;

the city backbone further comprises:

and the second anchoring module is used for acquiring the merkle tree submitted by the department sub-chain and submitting the merkle tree to the data connection background.

8. The system of blockchain nodes of claim 7, wherein the data connection back office further comprises:

and the third anchoring module is used for acquiring the merkle tree submitted by the city main chain and submitting the merkle tree to the provincial main chain.

9. The system of blockchain nodes of claim 8, wherein the provincial backbone further comprises:

and the fourth anchoring module is used for acquiring the merkle tree submitted by the data connection background and performing credit assessment based on the merkle tree.

10. A method of cooperation of a system of blockchain nodes implemented on the basis of the system of blockchain nodes according to any one of claims 1 to 9, comprising the steps of:

the department subchain processes the data of the department subchain and initiates a chain crossing request when a chain crossing requirement is generated;

based on the chain-crossing request, the city main chain coordinates chain-crossing communication among the department sub-chains in the city main chain communication connection, provides a channel for chain-crossing communication, and coordinates and supervises the chain-crossing communication;

when the chain crossing request is a city crossing chain request, the data connection background and the provincial main chain provide a channel for chain crossing communication, coordination and supervision during chain crossing communication are carried out, and chain data of the city main chain are submitted to the provincial main chain.

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