A method, device and medium for intra-jurisdiction enterprise cooperation based on blockchain

Abstract

The present application discloses a method, device and medium for enterprise cooperation within a jurisdiction based on blockchain, the method comprising: determining a blockchain platform pre-created based on a blockchain framework; determining resource information of multiple enterprise nodes; receiving a first cooperation request sent by a first enterprise node; receiving a first cooperation feedback sent by a second enterprise node; generating cooperation information. A blockchain platform is set up for each enterprise within the jurisdiction, and the cooperation process and resource information of each enterprise are stored in the blockchain platform. Since the data in the blockchain platform is open and transparent, each enterprise can initiate or receive cooperation requests with other enterprises through corresponding channels at any time. It can effectively improve the probability of cooperation between enterprises within the jurisdiction and their own work efficiency, and has a positive impact on the overall development of the jurisdiction. Moreover, since the blockchain platform is a distributed storage, data tampering of a single node will not take effect, which ensures the authenticity and credibility of the data on the blockchain platform.

Description

Technical Field

[0001] The present application relates to the field of blockchain, and specifically to a method, device and medium for intra-jurisdiction enterprise cooperation based on blockchain. Background Art

[0002] Currently, the enterprises and manufacturers within the jurisdiction are relatively independent, and their software and hardware resources are limited within them.

[0003] In terms of scientific research or technology, most enterprises work hard and lack communication with the surrounding areas when encountering technical bottlenecks. They cannot make full use of existing technical solutions, which reduces the work efficiency of enterprises. In terms of production and processing, some enterprises have full production tasks, while others are idle, which also has a negative impact on the overall development of the jurisdiction. Summary of the invention

[0004] In order to solve the above problems, the present application proposes a method for enterprise cooperation within a jurisdiction based on blockchain, including: determining a blockchain platform created in advance based on a blockchain framework, wherein the nodes in the blockchain platform include multiple enterprise nodes, and the multiple enterprise nodes belong to the same jurisdiction; determining the resource information of the multiple enterprise nodes, and writing the resource information into the blockchain platform, the resource information including at least one of talent resources, hardware resources, software resources, and financial resources; receiving a first cooperation request sent by a first enterprise node, the first cooperation request including at least one of a resource cooperation request and a technical cooperation request; receiving a first cooperation feedback sent by a second enterprise node, the first cooperation feedback corresponding to the first cooperation request; generating cooperation information based on the first cooperation request and the first cooperation feedback, and writing the cooperation information into the blockchain platform.

[0005] In one example, the blockchain platform also includes a supervision node, and the method further includes: receiving a supervision report sent by the supervision node, and writing the supervision report into the blockchain platform, the supervision report including the cooperation information and evaluation reports corresponding to the multiple enterprises.

[0006] In one example, the method also includes: receiving a second cooperation request sent by a blockchain platform corresponding to other jurisdictions; reviewing the second cooperation request through the regulatory node, and writing the second cooperation request into the blockchain platform after the review is passed; receiving a second cooperation feedback sent by a third enterprise node, the second cooperation feedback corresponding to the second cooperation request; reviewing the second cooperation feedback through the regulatory node, and sending the second cooperation feedback to the blockchain platform corresponding to the other jurisdiction after the review is passed; receiving the information of consent to cooperation sent by the blockchain platform corresponding to the other jurisdiction; generating cooperation information based on the second cooperation request and the second cooperation feedback, and writing the cooperation information into the blockchain platform.

[0007] In one example, determining the resource information of the multiple enterprise nodes includes: determining the collection devices corresponding to the multiple enterprise nodes respectively, the collection devices including at least one of warehousing equipment, attendance equipment, storage equipment, and production and processing equipment; receiving the resource information sent by the collection devices through the Internet of Things, and using the resource information as the resource information of the enterprise node corresponding to the collection device.

[0008] In one example, receiving a first cooperation request sent by a first enterprise node includes: receiving a first cooperation request carrying a contract sent by the first enterprise node, wherein the contract carries identity information of the first enterprise node; receiving a first cooperation feedback sent by a second enterprise node includes: receiving a first cooperation feedback carrying the contract sent by the second enterprise node, wherein the contract carries identity information of the first enterprise node and identity information of the second enterprise node; generating cooperation information based on the first cooperation request and the first cooperation feedback includes: generating cooperation information including the contract based on the first cooperation request and the first cooperation feedback.

[0009] In one example, when the first cooperation request is a technical cooperation request; generating cooperation information based on the first cooperation request and the first cooperation feedback, and writing the cooperation information into the blockchain platform, includes: generating cooperation information based on the first cooperation request and the first cooperation feedback; reviewing the cooperation information by the first enterprise and / or the second enterprise to determine the technical secrets contained in the cooperation information; hashing the technical secrets to obtain a hash value; replacing the technical secrets in the cooperation information with the hash value, and then writing it into the blockchain platform.

[0010] In one example, the method further includes: generating a corresponding smart contract and deploying it in the blockchain platform, wherein the smart contract includes: at least one of a resource information smart contract and a cooperation information smart contract.

[0011] In one example, the resource information smart contract is used to determine the resource information of the multiple enterprise nodes and write the resource information into the blockchain platform; the cooperation information smart contract is used to generate cooperation information based on the first cooperation request and the first cooperation feedback, and write the cooperation information into the blockchain platform.

[0012] On the other hand, the present application also proposes a blockchain-based intra-jurisdiction enterprise collaboration device, comprising: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute a method as described in any of the above examples.

[0013] On the other hand, the present application also proposes a non-volatile computer storage medium for intra-jurisdictional enterprise cooperation based on blockchain, storing computer executable instructions, and the computer executable instructions are configured to be: a method as described in any of the above examples.

[0014] The blockchain-based enterprise cooperation method proposed in this application can bring the following beneficial effects:

[0015] A blockchain platform is set up for each enterprise within the jurisdiction, and the cooperation process and resource information of each enterprise are stored in the blockchain platform. Since the data in the blockchain platform is open and transparent, each enterprise can initiate or receive cooperation requests with other enterprises at any time through corresponding channels. It can effectively improve the cooperation probability between enterprises in the jurisdiction and their own work efficiency, and have a positive impact on the overall development of the jurisdiction. Moreover, since the blockchain platform is a distributed storage, data tampering of a single node will not take effect, which ensures the authenticity and credibility of the data on the blockchain platform. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0017] Figure 1 This is a flowchart of the intra-jurisdiction enterprise cooperation method based on blockchain in the embodiment of this application;

[0018] Figure 2 This is a schematic diagram of the enterprise cooperation equipment within the jurisdiction based on blockchain in an embodiment of the present application. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution of the present application will be clearly and completely described below in combination with the specific embodiments of the present application and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

[0020] The technical solutions provided by various embodiments of the present application are described in detail below in conjunction with the accompanying drawings.

[0021] like Figure 1 As shown, the embodiment of the present application provides a method for cooperation among enterprises within a jurisdiction based on blockchain, including:

[0022] S101. Determine a blockchain platform pre-created based on a blockchain framework, wherein the nodes in the blockchain platform include multiple enterprise nodes, and the multiple enterprise nodes belong to the same jurisdiction.

[0023] Blockchain is a new application model of computer technologies such as distributed data storage, peer-to-peer transmission, consensus mechanism, and encryption algorithm. It is essentially a decentralized database.

[0024] First, a blockchain platform created based on a blockchain framework can be determined. The blockchain framework can be any blockchain framework that can implement the corresponding functions of the embodiments of the present application, such as Bitcoin, Ethereum, Fabric, Corda, etc. The blockchain platform can refer to a platform that stores blockchains, for example, a distributed system, etc. Of course, the blockchain platform can also directly represent the blockchain itself, which is not limited here.

[0025] When creating a blockchain platform, multiple enterprises within the jurisdiction can be deployed as nodes in the blockchain platform. Of course, since the embodiments of this application are mainly aimed at enterprises within the jurisdiction, the enterprise nodes in each blockchain platform can belong to the same jurisdiction. The jurisdiction here refers to the area under jurisdiction, which can be within a province, city, district, or county, or can be an area divided by enterprise park or other methods, which is not limited here.

[0026] S102. Determine resource information of the multiple enterprise nodes, and write the resource information into the blockchain platform, wherein the resource information includes at least one of talent resources, hardware resources, software resources, and financial resources.

[0027] After determining the pre-created blockchain platform, the resource information of each enterprise node in the blockchain platform can be determined, and then the resource information can be written into the blockchain platform. The writing process can be done by itself or by the corresponding node. When the enterprise node writes the resource information into the blockchain platform, other enterprise nodes can know the resource status of the enterprise, so as to facilitate the cooperation between the enterprise and other enterprises.

[0028] Specifically, resource information may include multiple types. For example, it may include talent resources, hardware resources, software resources, financial resources, etc. Among them, talent resources may include the number of employees in the enterprise, the fields in which the employees are good at, the certificates they have, etc. Hardware resources may include equipment, products, materials, etc. produced, processed, used or sold by the enterprise. Software resources may include software, codes, scripts and other resources produced and used by the enterprise. Financial resources refer to the funds owned or circulated by the enterprise, or the current borrowing situation of the enterprise, etc.

[0029] In addition, when determining the resource information of the enterprise node, the enterprise node can write the resource information into the blockchain platform by itself, or the corresponding node can write the resource into the blockchain platform. For example, the enterprise's financial resources are written into the blockchain platform through the bank node. It is also possible to send the corresponding resource information through the corresponding collection equipment in the enterprise through the Internet of Things, and then write the resource information into the blockchain platform. For example, the collection equipment may include storage equipment, attendance equipment, storage equipment, and production and processing equipment. The storage and warehousing information of the enterprise's products can be collected through the storage and warehousing equipment, and the storage and warehousing information belongs to hardware resources. The number of employees of the enterprise can be collected through the attendance equipment, and the number of employees belongs to talent resources. The software resources related to the enterprise can be collected through the storage device. The hardware resources such as the number of products and product models in the process of producing and processing products in the enterprise can also be collected through the production and processing equipment. Determining resource information through collection equipment and the Internet of Things not only has accurate results, but also improves work efficiency.

[0030] S103: Receive a first cooperation request sent by a first enterprise node, where the first cooperation request includes at least one of a resource cooperation request and a technical cooperation request.

[0031] S104: Receive first cooperation feedback sent by the second enterprise node, where the first cooperation feedback corresponds to the first cooperation request.

[0032] After determining the resource information of the enterprise, if an enterprise (the enterprise is referred to as the first enterprise in the embodiment of the present application) wants to cooperate, it can send a cooperation request to the blockchain platform (the cooperation request is referred to as the first cooperation request in the embodiment of the present application). The first cooperation request may include a resource cooperation request, a technical cooperation request, etc. The resource cooperation request means that the first enterprise wants to cooperate with other enterprises for the resources it owns or the resources it lacks. The technical cooperation request is to seek partners for the technology it lacks or the technology it owns.

[0033] At this time, if an enterprise (in the embodiment of this application, this enterprise will be referred to as the second enterprise) wants to cooperate with the first enterprise, it can send a first cooperation feedback corresponding to the first cooperation request, indicating whether it has the intention to cooperate with the first enterprise, and the resources and technologies that it can provide or require.

[0034] Furthermore, when receiving the first cooperation request sent by the first enterprise, the first cooperation request may carry a corresponding contract, and the contract may carry the identity information of the first enterprise node, such as the official seal of the first enterprise. When the second enterprise node sends the first cooperation feedback, the contract may also be carried in the first cooperation feedback, and in addition to the identity information of the first enterprise, the contract also includes the identity information of the second enterprise node, such as the official seal of the second enterprise. When generating cooperation information, the contract may also be written into the blockchain platform. Since paper contracts are not conducive to safekeeping, the signing process takes a long time, and electronic contracts are prone to the risk of being tampered with, storing the contract in the blockchain platform is not only convenient for safekeeping, but also the signing process does not require the two parties to meet, express delivery, etc., which saves time, and the blockchain is difficult to tamper with, which ensures that the contract is difficult to tamper with.

[0035] In addition, the first cooperation request is a technical cooperation request. After the cooperation information is generated based on the first cooperation request and the first cooperation feedback, the cooperation information can be reviewed by the first enterprise and / or the second enterprise to determine whether there are technical secrets in the cooperation information that both parties are unwilling to disclose. If not, the cooperation information can be directly sent to the blockchain platform. If so, the content related to the technical secret can be hashed to obtain a hash value, and the technical secret in the cooperation information can be replaced with the hash value and then written into the blockchain, thereby protecting the relevant interests of the enterprises.

[0036] S105. Generate cooperation information based on the first cooperation request and the first cooperation feedback, and write the cooperation information into the blockchain platform.

[0037] After the first cooperation request and the first cooperation feedback are sent by the first enterprise and the second enterprise respectively, the corresponding cooperation information can be generated and written into the blockchain platform. In addition to the first cooperation request and the first cooperation feedback, the cooperation information can also include the cooperation intention of both parties, that is, whether a consensus on cooperation is finally reached.

[0038] In one embodiment, the blockchain platform also includes a regulatory node, which can be the government, management agency, etc. corresponding to the jurisdiction, or a third-party trusted agency entrusted by the blockchain platform. The regulatory node can be used to supervise and manage each enterprise node in the blockchain platform. After the cooperation information is generated, the regulatory node can conduct a corresponding review of the cooperation information, generate a regulatory report, and write the regulatory report into the blockchain platform. Among them, the regulatory report can include cooperation information, evaluation reports, etc. The evaluation report can indicate whether the cooperation is legal, whether there are any problems, and the value generated.

[0039] Furthermore, if an enterprise in another jurisdiction wants to initiate a cooperation request (the cooperation request is referred to as the second cooperation request in the embodiment of the present application), the second cooperation request can be sent through the blockchain platform corresponding to the other jurisdiction. After the blockchain platform in this jurisdiction receives the second cooperation request, the regulatory node can first review it to examine whether it complies with relevant regulations. If the review is passed, the second cooperation request can be written into the blockchain platform. When the enterprise node in this jurisdiction (the enterprise is referred to as the third enterprise in the embodiment of the present application) wants to cooperate with the second cooperation request, it can send corresponding cooperation feedback (the cooperation feedback is sent in the embodiment of the present application). The regulatory node reviews the second cooperation feedback, and if the review is passed, the second cooperation feedback can be sent to the blockchain platform corresponding to other jurisdictions. If the enterprise node in other jurisdictions believes that the second cooperation feedback is fine and can cooperate with the third enterprise, it can send a message of consent to cooperation. At this time, the blockchain platform can generate cooperation information based on the second cooperation request and the second cooperation feedback, and write the cooperation information into the blockchain platform.

[0040] In one embodiment, corresponding smart contracts can also be generated in advance and deployed in the blockchain platform. Smart contracts include at least one of resource information smart contracts and cooperation information smart contracts. The resource information smart contract is used to: determine the resource information of multiple enterprise nodes and write the resource information into the blockchain platform; the cooperation information smart contract is used to: generate cooperation information based on the first cooperation request and the first cooperation feedback, and write the cooperation information into the blockchain platform. Since the smart contracts on the blockchain platform are public, each node can verify whether the smart contract complies with the pre-agreed agreement and deploy it on its own node. While improving the degree of transaction automation, it also further increases the degree of trust among enterprises. Smart contracts can only be changed by upgrading, which requires each node to be deployed synchronously, and once deployed, they can only be executed through programs without interference from human factors, which enhances the credibility of the data.

[0041] like Figure 2 As shown, the embodiment of the present application also provides a blockchain-based intra-jurisdiction enterprise cooperation device, including:

[0042] at least one processor; and,

[0043] a memory communicatively connected to the at least one processor; wherein,

[0044] The memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the method described in any one of the above embodiments.

[0045] An embodiment of the present application also provides a non-volatile computer storage medium for intra-jurisdictional enterprise cooperation based on blockchain, storing computer executable instructions, characterized in that the computer executable instructions are set to: a method as described in any of the above embodiments.

[0046] Each embodiment in this application is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the device and medium embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiments.

[0047] The devices and media provided in the embodiments of the present application correspond one-to-one to the methods. Therefore, the devices and media also have similar beneficial technical effects as the corresponding methods. Since the beneficial technical effects of the methods have been described in detail above, the beneficial technical effects of the devices and media will not be repeated here.

[0048] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0049] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0050] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0051] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process in the computer or other programmable device. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0052] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0053] The memory may include non-permanent storage in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0054] Computer readable media include permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. Information can be computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer readable media does not include temporary computer readable media (transitory media), such as modulated data signals and carrier waves.

[0055] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0056] The above is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A method for intra-jurisdiction enterprise cooperation based on blockchain, characterized in that: include: Determining a blockchain platform pre-created based on a blockchain framework, wherein nodes in the blockchain platform include a plurality of enterprise nodes, and the plurality of enterprise nodes belong to the same jurisdiction; Determine resource information of the multiple enterprise nodes, and write the resource information into the blockchain platform, wherein the resource information includes at least one of human resources, hardware resources, software resources, and financial resources; receiving a first cooperation request sent by a first enterprise node, wherein the first cooperation request includes at least one of a resource cooperation request and a technical cooperation request; receiving a first cooperation feedback sent by the second enterprise node, where the first cooperation feedback corresponds to the first cooperation request; Generate cooperation information based on the first cooperation request and the first cooperation feedback, and write the cooperation information into the blockchain platform; The blockchain platform also includes a supervision node, and the method further includes: Receiving a supervision report sent by the supervision node, and writing the supervision report into the blockchain platform, wherein the supervision report includes the cooperation information and evaluation reports corresponding to the multiple enterprises; The method further comprises: Receive a second cooperation request sent by a blockchain platform corresponding to another jurisdiction; Reviewing the second cooperation request through the supervision node, and writing the second cooperation request into the blockchain platform after the review is passed; receiving a second cooperation feedback sent by the third enterprise node, where the second cooperation feedback corresponds to the second cooperation request; The second cooperation feedback is reviewed by the supervision node, and after the review is passed, the second cooperation feedback is sent to the blockchain platform corresponding to the other jurisdiction; Receiving the information of consent to cooperation sent by the blockchain platform corresponding to the other jurisdiction; Generate cooperation information based on the second cooperation request and the second cooperation feedback, and write the cooperation information into the blockchain platform; When the first cooperation request is a technical cooperation request; Generating cooperation information based on the first cooperation request and the first cooperation feedback, and writing the cooperation information into the blockchain platform, includes: generating cooperation information based on the first cooperation request and the first cooperation feedback; The first enterprise and / or the second enterprise examines the cooperation information to determine the technical secrets contained in the cooperation information; Hash the technical secret to obtain a hash value; After replacing the technical secrets in the cooperation information with the hash value, it is written into the blockchain platform.

2. The method according to claim 1, characterized in that Determining resource information of the plurality of enterprise nodes includes: Determine the collection devices corresponding to the multiple enterprise nodes respectively, wherein the collection devices include at least one of a warehousing device, an attendance device, a storage device, and a production and processing device; Receive the resource information sent by the collection device through the Internet of Things, and use the resource information as the resource information of the enterprise node corresponding to the collection device.

3. The method according to claim 1, characterized in that Receiving a first cooperation request sent by a first enterprise node includes: receiving a first cooperation request carrying a contract sent by a first enterprise node, wherein the contract carries identity information of the first enterprise node; Receiving a first cooperation feedback sent by the second enterprise node includes: receiving a first cooperation feedback carrying the contract sent by the second enterprise node, wherein the contract carries the identity certification information of the first enterprise node and the identity certification information of the second enterprise node; Generating cooperation information based on the first cooperation request and the first cooperation feedback includes: Cooperation information including the contract is generated based on the first cooperation request and the first cooperation feedback.

4. The method according to claim 1, characterized in that: The method further comprises: Generate a corresponding smart contract and deploy it in the blockchain platform, wherein the smart contract includes at least one of a resource information smart contract and a cooperation information smart contract.

5. The method according to claim 4, characterized in that The resource information smart contract is used to: determine the resource information of the multiple enterprise nodes and write the resource information into the blockchain platform; The cooperation information smart contract is used to: generate cooperation information based on the first cooperation request and the first cooperation feedback, and write the cooperation information into the blockchain platform.

6. A blockchain-based enterprise cooperation device within the jurisdiction, characterized in that: include: at least one processor; as well as, a memory communicatively connected to the at least one processor; wherein, The memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform the method according to any one of claims 1 to 5.

7. A non-volatile computer storage medium for intra-jurisdictional enterprise cooperation based on blockchain, storing computer executable instructions, characterized in that: The computer executable instructions are configured as follows: a method as described in any one of claims 1 to 5.

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