Marine Plastic Waste Electronic Ledger Management System Based on Blockchain Technology

Abstract

The present invention provides an electronic document management system for marine plastic waste based on blockchain technology. [Solution] This application belongs to the field of marine plastic waste management, and includes a cloud management platform located at the central node of the blockchain and service sites located at the remaining nodes, the cloud management platform is for monitoring and managing the marine waste transfer process between each service site, checks the electronic identity card of the service site that issues the marine waste transfer order request through a blacklist / whitelist mechanism, and for the electronic identity card that has exceeded its validity period, updates the status and validity period of the electronic identity card through a credit evaluation model, and rejects the marine waste transfer order request issued by the service site in the blacklist. The present invention realizes centralized management based on the blockchain architecture, realizes the handover of tasks between each node through a pre-compiled smart contract, and ensures a complete evidence chain in the entire process of collecting, transporting and treating marine plastic waste through the blacklist / whitelist mechanism of the credit evaluation model, making data traceable and easy to monitor and manage.

Description

Technical Field

[0001] The present invention relates to the field of marine plastic waste management, and particularly to an electronic ledger (management system) for marine plastic waste based on blockchain technology.

Background Art

[0002] The treatment of marine plastic waste has always been an urgent problem to be solved in the field of global marine environmental protection. Governments, enterprises, research institutions, the public, etc. are all exploring and practicing how to control and reduce the amount of marine plastic waste. Sorting, collecting, and recycling marine plastic waste is currently one of the most environmentally friendly methods, and an international market for the recycling and high-value utilization of marine plastic waste, guided by well-known global brands, with a larger scale and growing needs, has been formed. Since the recovery and recycling cost of marine plastic waste is much higher than that of land-based plastic waste, and the lack of international market demand for recycled marine plastic is large and the price is high, how to ensure that recycled plastic in the market is derived from the sea, and how to prevent the mixing or fraud of land-based recycled plastic are important issues of concern to the global marine plastic waste recycling and high-value utilization industry and market.

[0003] Internationally, for the traceability certification system based on the concept of Ocean Bound Plastic (OBP), it is difficult to provide objective, accurate, and operable standards to ensure that the sources of marine plastics mainly rely on self-declarations and are derived from the ocean. There is a high risk that marine plastics will be "greened" globally, which hinders the development of the marine plastic recycling industry. To promote the global marine environmental treatment and encourage the removal of these marine plastics from the marine environment through recycling methods, it is necessary to solve the "trust" problem of the sources of marine plastics by digital technology. With a set of evidence chains, it is ensured that the data information of the entire process of collecting, accumulating, relaying, transporting, and recycling marine plastics from the marine environment is true, accurate, and not artificially tampered with. Currently, since a complete management system from the collection to the treatment of a set of marine plastics has not been reported yet, there are always "trade barriers due to environmental regulations" in the international market of marine plastics.

[0004] In the prior art, a more mature one is the management plan for land-based hazardous waste. However, in the actual operation process, it is disadvantageous for overall management, more decentralized. When applying the treatment process of land-based hazardous waste to the treatment process of marine plastic waste, there are also problems such as being difficult to monitor and manage, lacking evidence chains, and being difficult to statistically process treatment data.

Summary of the Invention

Problems to be Solved by the Invention

[0005] In response to the deficiencies of the prior art, the present invention discloses an electronic ledger management system for marine plastic waste based on blockchain technology, and has established a complete management system for marine plastic waste relying on blockchain technology. It manages from the source of marine plastic waste collection, regulates each service site based on the blacklist / whitelist management mechanism, and ensures the on-chain accuracy and traceability of data.

Means for Solving the Problems

[0006] To achieve the above object, the technical solution adopted by the present invention is as follows.

[0007] An electronic ledger management system for marine plastic waste based on blockchain technology, comprising a cloud management platform arranged at the central node of the blockchain and service sites arranged at the remaining nodes of the blockchain, wherein the service sites include a marine waste collection end, a marine waste transportation relay end, a marine waste storage end, a marine waste transportation end and a marine waste disposal end, and the marine waste collection end, the marine waste transportation relay end and the marine waste storage end issue a marine waste transfer order request to the cloud management platform in a smart contract manner. The cloud management platform is for monitoring and managing the process of marine waste transfer between each service site. It checks the electronic identity certificate of the service site that issues the marine waste transfer order request through a blacklist / whitelist mechanism. If the electronic identity certificate has exceeded the validity period, it calls the corresponding service site data and checks the service site through a credit evaluation model. Based on the check result, it updates the status and validity period of the electronic identity certificate. If the electronic identity certificate is on the blacklist, it rejects the marine waste transfer order request of the service site. If the electronic identity certificate is on the whitelist, it broadcasts the marine waste transfer order request of the service site to the marine waste transportation end. The marine waste transportation end receives the control command of the cloud management platform and transports the marine waste at the marine waste collection end to the marine waste transportation relay end or the marine waste storage end, or transports the marine waste at the marine waste transportation relay end to the marine waste storage end or the marine waste disposal end, or transports the marine waste at the marine waste storage end to the marine waste disposal end.

[0008] Furthermore, the credit evaluation model is expressed as I = [C, G, Z, H], where C represents the number of times of illegal operations by the operator, G represents the abnormal value of the collection amount of marine plastic waste, Z represents the number of transfer order requests, H represents the transfer amount. When the output result of any one item of the credit evaluation model is abnormal, the cloud management platform will put the electronic certificate of the service site that issues the marine waste transfer order request on the blacklist. When the output results of all items of the credit evaluation model are normal, the cloud management platform will put the electronic certificate of the service site that issues the marine waste transfer order request on the white list. The validity period is set for the electronic certificate information, and the electronic certificate information that exceeds the validity period will be removed from the blacklist / white list.

[0009] Furthermore, the method for determining the abnormal value of the collection amount of the marine plastic waste includes the following steps (1) to (4). In step (1), the historical sample data of the service site in three types of intervals, namely the slack period, the normal period, and the busy period, is obtained, and the weight prediction value of the sample data in different intervals is calculated. In step (2), a correction coefficient is calculated based on the weight prediction value of the sample data and the actual reported value of the service site. In step (3), a weight comparison value is calculated according to the following formula 2 based on the correction coefficient.

Number

Advantages of the Invention

[0010] Compared with the prior art, the present invention has the following beneficial effects.

[0011] The present invention checks the electronic certificate of identity of the service site that issues the marine garbage transfer order request through the blacklist / whitelist mechanism. In the case of an electronic certificate of identity that has exceeded the validity period, the status and validity period of the electronic certificate of identity are updated by the credit evaluation model, and the marine garbage transfer order request issued by the service site within the blacklist is rejected. On the one hand, the present invention realizes centralized management based on the blockchain architecture and realizes the transfer of tasks between nodes through pre-compiled smart contracts. On the other hand, the blacklist / whitelist mechanism of the credit evaluation model ensures a complete evidence chain throughout the collection, transportation, and processing process of marine plastic garbage, making the data traceable and easy to monitor and manage.

Brief Description of the Drawings

[0012]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Embodiments for Carrying Out the Invention

[0013] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail by way of embodiments with reference to the drawings below. It should be understood that the specific embodiments described herein are merely for interpreting the present invention and not for limiting the present invention.

[0014] Conversely, the present invention includes any alternatives, modifications, equivalent methods, and solution means made based on the essence and scope of the present invention as defined by the claims. Further, to enable the public to better understand the present invention, in the following detailed description of the present invention, some specific detailed parts are described in detail. A person skilled in the art can fully understand the present invention even without the description of these detailed parts.

[0015] Unless otherwise defined, all technical and scientific terms used in the present invention have the same meaning as commonly understood by a person skilled in the art. The terms used in the present invention are merely for explaining specific embodiments and are not intended to limit the present invention. The term "and / or" used in the present invention includes any and all combinations of one or more of the related listed items.

[0016] As shown in Figure 1, an electronic ledger management system for marine plastic waste based on blockchain technology according to this embodiment mainly includes the following.

[0017] The cloud management platform manages the transfer process of marine plastic waste from the collection end to the disposal end based on pre-compiled smart contracts.

[0018] The marine waste collection end is for collecting marine waste and uploading an evidence package to the cloud management platform.

[0019] The marine waste transportation relay end serves as the accumulation area for the relay of marine waste transportation.

[0020] The marine waste storage end serves as the target storage area for marine waste.

[0021] The marine waste transportation end receives control instructions from the cloud management platform and transfers marine waste based on them.

[0022] The marine waste disposal end is used for disposing of marine waste.

[0023] The marine waste collection end, the marine waste transportation relay end, the marine waste storage end, the marine waste transportation end and the marine waste disposal end are service sites and are integratedly managed by the cloud management platform. The present invention realizes a marine plastic waste electronic ledger management system by means of a blockchain architecture, with the cloud management platform arranged at the central node of the blockchain and each service site arranged at the remaining nodes of the blockchain.

[0024] In one specific implementation of the present invention, as shown in FIG. 2, the node at the central position is denoted as the central node, and the remaining nodes around the central node are denoted as the first node, the second node, the third node, the fourth node, and the fifth node. These five nodes are not numbered in sequence in the sequence diagram of the blockchain shown in FIG. 2. The marine garbage collection terminal is arranged at the first node of the blockchain, the marine garbage transportation relay terminal is arranged at the third node of the blockchain, the marine garbage accumulation terminal is arranged at the fourth node of the blockchain, the marine garbage transportation terminal is arranged at the second node of the blockchain, and the marine garbage disposal terminal is arranged at the fifth node of the blockchain. Note that since the marine garbage transportation terminal basically serves the transfer tasks between all service nodes and the next node, for the convenience of display, not all arrows having an interaction relationship with the marine garbage transportation terminal are drawn in FIG. 2.

[0025] The cloud management platform is arranged at the central node of the blockchain, can monitor and manage the process of transferring marine garbage between each service site, check the electronic certificate of identity of the service site that issues the marine garbage transfer order request through the blacklist / whitelist mechanism. When the electronic certificate of identity exceeds the validity period, call the corresponding service site data, check the service site by the credit evaluation model, update the status and validity period of the electronic certificate of identity based on the check result. When the electronic certificate of identity is on the blacklist, reject the marine garbage transfer order request of the service site. When the electronic certificate of identity is on the white list, broadcast the marine garbage transfer order request of the service site to the marine garbage transportation terminal. The marine garbage transportation terminal receives the control command of the cloud management platform and transports the marine garbage at the marine garbage collection terminal to the marine garbage transportation relay terminal or the marine garbage accumulation terminal, or transports the marine garbage at the marine garbage transportation relay terminal to the marine garbage accumulation terminal or the marine garbage disposal terminal, or transports the marine garbage at the marine garbage accumulation terminal to the marine garbage disposal terminal.

[0026] In one specific implementation of the present invention, the initialization electronic identity certificates of all service sites arranged on the blockchain nodes are normal and are placed on the whitelist.

[0027] In one specific implementation of the present invention, the above-mentioned marine garbage collection terminal, marine garbage transportation relay terminal, and marine garbage storage terminal issue a marine garbage transfer order request to the cloud management platform in a smart contract manner, and a smart contract pre-compiled in the lowest layer of the blockchain is provided. Specifically, The first node sends a transfer order request to the central node. The central node checks the electronic identity certificate information of the first node. If the check is passed, the central node broadcasts the received transfer order to the second node. After receiving the transfer order, the second node, the central node selects the third node or the fourth node as the target service site of the transfer order, and the central node generates and stamps the electronic ledger of the first node. The third node or the fourth node sends a transfer order request to the central node. The central node checks the electronic identity certificate information of the third node or the fourth node. If the check is passed, the central node broadcasts the received transfer order to the second node. After receiving the transfer order, the second node, the central node selects the fourth node or the fifth node as the target service site of the transfer order, and the central node generates and stamps the electronic ledger of the third node or the fourth node. After the transfer vehicle arrives at the target service site, the target service site checks the electronic ledger of the previous node and the transfer vehicle information. If the check is passed, it receives the transfer goods. If the target service site is the fifth node, the central node generates and stamps the electronic ledger of the fifth node, and archives all the transfer order completion progress status corresponding to the transfer goods to the first node. In the transfer process, the electronic invoice corresponding to the transfer order and the vehicle information for transfer are synchronized by the central node to the target service site node, and only the electronic invoice of the previous node can be confirmed so that the next node can match the electronic invoice of the previous node with its own electronic invoice, and the central node can confirm the electronic invoices of all nodes.

[0028] The cloud management platform arranged at the nodes of the blockchain and the communication between its service sites shall comply with the above smart contract, and the complex management process of the present invention can be executed in a smart contract manner. For example, taking the case where the ocean garbage collection terminal located at the first node sends a transfer order request to the cloud management platform as an example, as shown in FIG. 3, the process includes the following steps S11 to S15.

[0029] In step S11, the ocean garbage collection terminal uploads an evidence package to the cloud management platform, and when the predetermined collection amount is reached, it sends a transfer order request to the cloud management platform. The information in the evidence package includes information such as the basic information of the operator, the name and its coordinate position of the ocean garbage collection terminal, the collection location, the collection time, the video of the collection process, the type of ocean garbage plastic, and the weight data of the ocean garbage.

[0030] In step S12, the cloud management platform receives the evidence package of the collection process uploaded by the marine garbage collection terminal, generates the evidence chain of the collection stage, and checks the electronic identity certificate of the marine garbage collection terminal that issues requests based on the blacklist / whitelist. If the electronic identity certificate is on the whitelist, the marine garbage transfer order request of the marine garbage collection terminal is broadcast to the marine garbage transportation terminal. If the electronic identity certificate is on the blacklist, the request is rejected. If the electronic identity certificate of the service site is not in either the whitelist or the blacklist, or if the electronic identity certificate has expired, it is necessary to re-check the service site by the credit evaluation model and update the status and validity period of the electronic identity certificate based on the check result. Similar to the automatic listing of electronic identity certificates within the validity period in the blacklist or whitelist, electronic identity certificates exceeding the validity period are automatically removed from the blacklist or whitelist.

[0031] In this step, the cloud management platform will check the information in the evidence package. Taking the collection location as an example, the collection range is mainly determined according to the certification requirements of the internationally recognized OBP Ocean Bound Plastic, mainly Potential marine plastics within the range from the lowest tide level to 100m offshore and from the lowest tide level to 50km on land, The range from the highest tide level to 200m on land, and coastal marine plastics within the range from the lowest tide level to 100m offshore, and Waterway marine plastics, which are waste plastic garbage within the river or within 200m on both sides of the river, are divided into three categories. The collection terminal may collect at sea (such as pulling up garbage), or may collect on land (such as installing a weir at the river course to block garbage, or picking up garbage within the shoreline range).

[0032] One selectable implementation process is that the collection unit incorporates the collector information into management. The collector needs to register their identity with the collection unit to create an account. The collection unit checks the identity and grants the created account the relevant permissions for the ocean plastic waste collection task. The collector receives the collection task by operating the mobile terminal and conducts the collection work of ocean plastic waste within the planned collection scope on the cloud management platform. During the collection process, the collection unit obtains the GPS positioning of the mobile terminal, determines whether the collector exceeds the pre-planned collection scope based on the video and GPS positioning information, and records the number of violations. The collection unit inputs the weight of the ocean plastic waste using an electronic scale, checks the video of the collection process, collates it with the GPS positioning track of the collection process, and synchronizes and uploads the partial information to the cloud management platform.

[0033] In step S13, all transfer vehicles at the ocean waste transportation end are registered on the cloud management platform. The registration information includes license plate information, transfer capacity information, real-time position of the transfer vehicle, etc., but is not limited to these. All transfer vehicles are equipped with on-vehicle monitoring and positioning devices. The cloud management platform obtains the transfer vehicle that matches based on the conventional transfer vehicle matching algorithm.

[0034] In step S14, after the transfer vehicle receives the transfer order, the cloud management platform generates and stamps the electronic invoice at the ocean waste collection end, synchronizes the information such as the electronic invoice and the transfer vehicle to the target service site, and the transfer vehicle transports the ocean waste accumulated at the ocean waste collection end to the ocean waste transportation relay end or the ocean waste storage end based on the control command of the cloud management platform.

[0035] Note that the marine plastics at the marine garbage collection end can be transferred to the marine garbage transportation relay end or the marine garbage storage end. The specific target service site is scheduled by the cloud management platform. The specific scheduling algorithm and the vehicle matching algorithm for the above transfer may both be realized by the prior art. Referring to the scheduling model in which the Didi platform on the Chinese side arranges vehicles, detailed description is omitted in the present invention.

[0036] In step S15, after the transfer vehicle arrives at the target service site, the target service site checks the electronic ledger and vehicle information of the marine garbage collection end. If the check is passed, it receives the transferred goods.

[0037] In one specific implementation of the present invention, taking the case where the marine garbage storage end located at the fourth node sends a transfer order request to the cloud management platform as an example, as shown in FIG. 4, the process includes the following steps S21 to S25.

[0038] In step S21, the marine garbage storage end sends a transfer order request to the cloud management platform.

[0039] In step S22, the cloud management platform checks the electronic identity certificate of the marine garbage accumulation terminal that issues requests based on the blacklist / whitelist. If the electronic identity certificate is on the whitelist, the marine garbage transfer order request of the marine garbage accumulation terminal is broadcast to the marine garbage transportation terminal. If the electronic identity certificate is on the blacklist, the request is rejected. When the electronic identity certificate of the service site is not in either the whitelist or the blacklist, or when the electronic identity certificate has expired, it is necessary to re-check the service site by the credit evaluation model and update the status and validity period of the electronic identity certificate based on the check result. Similar to the automatic listing of electronic identity certificates within the validity period on the blacklist or whitelist, electronic identity certificates exceeding the validity period are automatically removed from the blacklist or whitelist.

[0040] In step S23, the cloud management platform obtains the transfer vehicle to be matched based on the conventional transfer vehicle matching algorithm.

[0041] In step S24, after the transfer vehicle receives the transfer order, the cloud management platform generates and stamps the electronic invoice of the marine garbage accumulation terminal, and synchronizes information such as the electronic invoice and the transfer vehicle to the marine garbage disposal terminal. The transfer vehicle transports the marine garbage at the marine garbage accumulation terminal to the marine garbage disposal terminal based on the control command of the cloud management platform.

[0042] In step S25, after the transfer vehicle arrives at the marine waste disposal terminal, the marine waste disposal terminal checks the electronic ledger of the marine waste storage terminal and the vehicle information. If the check is passed, it receives the transfer items. The cloud management platform generates and stamps the electronic ledger of the marine waste disposal terminal, archives all transfer order completion progress status corresponding to the transfer items at the marine waste collection terminal, ensures a complete evidence chain in the entire collection, transportation, and processing process of marine plastic waste, enables data traceability, and facilitates monitoring and management.

[0043] In one specific implementation of the present invention, the credit evaluation model is shown as I = [C, G, Z, H], where C represents the number of times of illegal operations by the operator, G represents the abnormal value of the collection volume of marine plastic waste, Z represents the number of transfer order requirements, H represents the transfer volume. When the output result of any one item of the credit evaluation model is abnormal, the cloud management platform puts the electronic identity certificate of the service site that issues the marine waste transfer order requirement on the blacklist. When the output results of all items of the credit evaluation model are normal, the cloud management platform puts the electronic identity certificate of the service site that issues the marine waste transfer order requirement on the white list. The electronic identity certificate information is set with a validity period, and the electronic identity certificate information exceeding the validity period is removed from the blacklist / white list.

[0044] Each service site is unified by the cloud management platform. When an operator at the service site conducts illegal operations, the name of the site and the time of illegal operations are automatically uploaded. When conducting a credit evaluation of the number of illegal operations of the operator for a certain service site, the number of illegal operations within the evaluation period is obtained based on the evaluation period preset on the platform. For example, if the evaluation period is three months, there is no record of illegal actions three months ago. In this embodiment, the illegal operation actions include, but are not limited to, collecting marine plastics outside the scope, not arranging monitoring devices according to requirements, and not storing the video of the collection process.

[0045] The cloud management platform similarly records the transfer order requests and request times of each service site, whether the requests have been received, etc. For service sites where the number of requests received within the evaluation period is lower than a certain value, it is explained that the service site is not active, and its evaluation result is made abnormal. Since requests submitted by abnormal service sites are not received, it is necessary to manually check to re-list the service site in the white list. When passing the manual check, its electronic certificate is initialized and listed in the white list.

[0046] Since the size of the transfer volume is related to the transfer cost and the activity of the service site, a minimum transfer volume is set in the management system of the present invention. For service sites where the total transfer volume within the evaluation period is lower than a certain value, its evaluation result is made abnormal, which is the same as the processing method when the number of transfer order requests is abnormal.

[0047] In the actual operation process, in order to encourage the removal of marine plastic waste from the marine environment, an incentive system is set up to recycle marine plastic waste at a high price, and the recovery subsidy standard is much higher than that of general terrestrial plastic waste. Therefore, in order to avoid faking marine plastic with out-of-scope plastic waste, a judgment of abnormal collection volume is set, which improves the monitoring management intensity and convenience compared with human monitoring management. Therefore, the judgment of the abnormal value of the collection volume of marine plastic waste is particularly important. The judgment of the abnormal value is related to the difference between the predicted weight value of the marine plastic waste that the service site should transfer and the actual reported value of the service site, and is also affected by factors such as season and environment. After considering various influencing factors, this embodiment designs a method for judging the abnormal value of the collection volume of marine plastic waste, which includes the following (1) to (4) as shown in FIG. 5.

[0048] (1) Obtain the historical sample data of the service site in three types of intervals: slack period, normal period, and peak period, calculate the weighted prediction values of the sample data in different intervals. For example, according to the actual situation of a certain sea area, divide June to September into the peak period, divide November to February into the slack period, and divide the rest into the normal period.

[0049] Since the collection of marine plastic waste is affected by various uncontrollable factors, there are variations in the collection volume, and it is difficult to remove noise from the data by ordinary mixed statistics. Therefore, errors occur in the identification of abnormal values, and the interval-based judgment contributes to the improvement of judgment accuracy.

[0050] (2) Calculate the correction coefficient based on the weighted prediction value of the sample data and the actual reported value of the service site, where the correction coefficient = actual reported value - weighted prediction value.

[0051] In this embodiment, the weighted prediction value is calculated and obtained by a linear regression equation model. The arguments of the linear regression equation model include tidal water level, wind force grade, weather type, and season type. Collect the historical data of the past year, and by statistically analyzing the tidal water level, wind force grade, weather type, season type, and marine waste collection volume, the trend of the marine waste collection volume changing with the tidal water level, wind force grade, weather type, and season type throughout the year can be obtained, which is shown in the following formula 1:

Equation

[0052] In the fitting process of the linear regression equation, a time period such as day, month, season, or year may be set, or the number of days may be set by the user. The shorter the set period, the higher the accuracy. The weight prediction value g (the observed value of the argument) needs to be defined based on the set time period. When the time period is a day, g indicates the daily ocean waste collection volume in the fitting process. When the time period is a month, g indicates the monthly ocean waste collection volume in the fitting process. Similarly, the time period of the actual reported value of the service site should also match the time period of the weight prediction value.

[0053] According to the above linear regression equation, while various influencing factors are integrated, it can be classified according to the differences in collection scenes, and the accuracy of the weight prediction result is ensured.

[0054] (3) Based on the correction coefficient, calculate the weight comparison value according to the following formula 2,

Equation

[0055] When calculating the weight comparison value, the weight comparison values w = {sre i1 , sre i2 , sre i3} in different intervals are calculated according to the historical sample data of the idle period, normal period, and busy period respectively. Among them, sre i1 indicates the weight comparison value in the busy period, sre i2 indicates the weight comparison value in the normal period, and sre i3 indicates the weight comparison value in the idle period. (4) Determine whether the absolute value of the weight comparison value in the actual interval is greater than the threshold. If YES, there is an abnormality in the ocean waste weight data of the service site. If NO, the ocean waste weight data of the service site is normal.

[0056] In this embodiment, taking the peak period as an example, the logical statement for determining the abnormal value G of the collection amount of marine plastic waste is shown in Equation 3 below.

Number

[0057] In one specific implementation of the present invention, the process from the collection end to the disposal end of marine waste is shown in FIG. 6 and includes the following steps S31 to S33.

[0058] In step S31, the collection end uploads the weight information and evidence package of the collected marine plastic to the cloud management platform and sends a transfer request.

[0059] In step S32, when the cloud management platform passes the check, it assigns a transport vehicle to perform the transfer operation and transports it to the storage end.

[0060] In step S33, the storage end sends a transfer request to the cloud management platform. When the cloud management platform passes the check, it assigns a transport vehicle to perform the transfer operation, transports it to the disposal end, granulates it, and regenerates it.

[0061] In the above transfer process of marine plastic waste, the cloud management platform generates and stamps the electronic invoices of each service site. For details, reference may be made to steps S11 to S15 and steps S21 to S25 in the above embodiments. Similarly, the cloud management platform checks each transfer request through a blacklist / whitelist mechanism based on a credit evaluation model.

[0062] Finally, it should be noted that the above embodiments are merely for explaining the technical solutions of the present invention and do not limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that it is still possible to modify or equivalently replace the specific embodiments of the present invention. Any modification or equivalent replacement that does not deviate from the gist and scope of the present invention should be included within the scope of the claims of the present invention.

Claims

1. An electronic ledger management system for marine plastic waste based on blockchain technology, comprising a cloud management platform arranged at the central node of the blockchain and service sites arranged at the remaining nodes of the blockchain. The service sites include a marine waste collection terminal, a marine waste transportation relay terminal, a marine waste storage terminal, a marine waste transportation terminal, and a marine waste disposal terminal. The marine waste collection terminal, the marine waste transportation relay terminal, and the marine waste storage terminal issue marine waste transfer order requests to the cloud management platform in a smart contract manner. The cloud management platform is for monitoring and managing the process of marine waste transfer between service sites. It checks the electronic identity certificate of the service site that issues the marine waste transfer order request through a blacklist / whitelist mechanism. When the electronic identity certificate exceeds the validity period, it calls the corresponding service site data, checks the service site through a credit evaluation model, updates the status and validity period of the electronic identity certificate based on the check result. When the electronic identity certificate is on the blacklist, it rejects the marine waste transfer order request of the service site. When the electronic identity certificate is on the whitelist, it broadcasts the marine waste transfer order request of the service site to the marine waste transportation terminal. The marine waste transportation terminal receives the control command of the cloud management platform and transports the marine waste at the marine waste collection terminal to the marine waste transportation relay terminal or the marine waste storage terminal, or transports the marine waste at the marine waste transportation relay terminal to the marine waste storage terminal or the marine waste disposal terminal, or transports the marine waste at the marine waste storage terminal to the marine waste disposal terminal. The credit evaluation model is expressed as I = [C, G, Z, H], where C represents the number of times of workers' violation operations, G represents the abnormal value of the collection amount of marine plastic waste, Z represents the number of transfer order requests, H represents the transfer amount. When the output result of any one item of the credit evaluation model is abnormal, the cloud management platform will put the electronic certificate of the service site that issues the marine waste transfer order request on the blacklist. When the output results of all items of the credit evaluation model are normal, the cloud management platform will put the electronic certificate of the service site that issues the marine waste transfer order request on the white list. The electronic certificate information is set with a validity period, and the electronic certificate information exceeding the validity period is removed from the blacklist / white list. The method for determining the abnormal value of the collection amount of the marine plastic waste includes the following steps (1) to (4). In step (1), historical sample data of the service site in three types of intervals, namely the slack period, the normal period, and the busy period, are obtained, and the weight prediction values of the sample data in different intervals are calculated. In step (2), a correction coefficient is calculated based on the weight prediction value of the sample data and the actual reported value of the service site. In the step (3), a weight comparison value sre of each history sample data is calculated based on a correction coefficient ｉ by the following formula 2, 【Number 2】 【Number】 represents the correction coefficient of the i-th historical sample data, t represents the design matrix composed of historical sample data, and x ２ represents the mean squared error of the historical sample data, t' represents the transpose of t, When calculating the weight comparison value, the weight comparison values w = {sre ｉ１ , sre ｉ２ , sre ｉ３} in different intervals are calculated according to the historical sample data in the idle period, normal period, and peak period respectively, where sre ｉ１ represents the weight comparison value in the peak period, sre ｉ２ represents the weight comparison value in the normal period, and sre ｉ３ represents the weight comparison value in the idle period. In step (4), it is determined whether the absolute value of the weight comparison value in the actual interval is greater than the threshold. If YES, there is an abnormality in the weight data of the marine waste at the service site. If NO, the weight data of the marine waste at the service site is normal. A marine plastic waste electronic ledger management system based on blockchain technology, characterized in that.

2. Regarding the arrangement method of the service site in the blockchain node, The marine waste collection end is arranged at the first node of the blockchain, and is used for collecting marine waste and uploading the evidence package to the cloud management platform. The marine waste transportation relay end is arranged at the third node of the blockchain and serves as the transportation relay accumulation area for marine waste. The marine waste accumulation end is arranged at the fourth node of the blockchain and serves as the target accumulation area for marine waste. The marine waste transportation end is arranged at the second node of the blockchain and is used for receiving the control command of the cloud management platform and transferring marine waste based on it. The ocean waste disposal terminal is arranged at the fifth node of the blockchain and is for disposing of ocean waste. The marine plastic waste electronic ledger management system based on the blockchain technology according to claim 1, characterized in that.

3. Regarding the provision of a smart contract pre-compiled in the lowest layer of the blockchain, specifically, The first node sends a transfer order request to the central node. The central node checks the electronic certificate information of the first node. If the check is passed, the central node broadcasts the received transfer order to the second node. After receiving the transfer order, the second node selects the third node or the fourth node as the target service site of the transfer order by the central node. The central node generates and stamps the electronic ledger of the first node. The third node or the fourth node sends a transfer order request to the central node. The central node checks the electronic certificate information of the third node or the fourth node. If the check is passed, the central node broadcasts the received transfer order to the second node. After receiving the transfer order, the second node selects the fourth node or the fifth node as the target service site of the transfer order by the central node. The central node generates and stamps the electronic ledger of the third node or the fourth node. After the transfer vehicle arrives at the target service site, the target service site checks the electronic ledger of the previous node and the transfer vehicle information. If the check is passed, it receives the transferred goods. When the target service site is the fifth node, the central node generates and stamps the electronic ledger of the fifth node, and archives the completion progress status of all transfer orders corresponding to the transferred goods to the first node. In the transfer process, the electronic ledger corresponding to the transfer order and the transfer vehicle information are synchronized by the central node to the target service site node. Only the electronic ledger of the previous node can be confirmed so that the next node can compare the electronic ledger of the previous node with the electronic ledger of this node, and the central node can confirm the electronic ledgers of all nodes. The marine plastic waste electronic ledger management system based on the blockchain technology according to claim 2, characterized in that.

4. The information in the evidence package includes the basic information of the operator, the name and its coordinate position of the ocean garbage collection terminal, the collection location, the collection time, the video of the collection process, the type and weight data of the ocean plastic garbage. The electronic ledger management system for ocean plastic garbage based on blockchain technology according to claim 2, characterized in that.

5. The weight prediction value is obtained by calculation using a linear regression equation model, and the arguments of the linear regression equation model include the tidal water level, wind force level, weather type, and season type. The electronic ledger management system for ocean plastic garbage based on blockchain technology according to claim 1, characterized in that.

6. In the credit evaluation model, for the number of times of the operator's violation operations, the number of transfer order requests, and the transfer volume, the threshold judgment method is used, and it is summarized that it is abnormal that the number of times of the operator's violation operations exceeds the threshold, and the number of transfer order requests or the transfer volume is lower than the threshold. The electronic ledger management system for ocean plastic garbage based on blockchain technology according to claim 1, characterized in that.

7. The initialization electronic identity certificates of all service sites arranged at the blockchain nodes are normal and are listed in the white list. The electronic ledger management system for ocean plastic garbage based on blockchain technology according to claim 1, characterized in that.

8. All transfer vehicles at the ocean garbage transportation terminal are provided with in-vehicle monitoring and in-vehicle positioning devices. The electronic ledger management system for ocean plastic garbage based on blockchain technology according to claim 1, characterized in that.

Images