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31results about How to "Resolve opacity" patented technology

Blockchain-based database system and method of using same

ActiveCN107292181AFix permission issuesSolve the problem of excessive permissionsDigital data protectionSpecial data processing applicationsConfidentialityCentral database
The invention discloses a blockchain-based database system, comprising a client, an access server and a blockchain verification server. A method of using the blockchain-based database system comprises the steps of 1, registering a blockchain account on the blockchain verification server through the client, or registering, by the blockchain verification server itself, the blockchain account on the blockchain verification server, and acquiring a public key and a private key; 2, writing, by a user, data into the access server through the client; 3, transmitting, by the access server, a request to the blockchain verification server to perform data co-recognition; 4, submitting, by the user, a query request to the access server through the client to perform related query; 5, after the user obtains data query results, directly using, by the user, the results to read data, or otherwise the user having the need to perform data query; after data reading, unlocking the data by the user through his or her own account private key. The problems are solved that data in a central database are insecure and it is difficult for a distributed database to arrive at uniformity and data confidentiality.
Owner:无锡井通网络科技有限公司

Smart contract deployment and calling method and device

The invention discloses an intelligent contract deployment and calling method and device. The intelligent contract deployment method is executed by block chain nodes and comprises the steps of receiving a first transaction containing byte codes of an intelligent contract, wherein the intelligent contract is compiled and compiled in advance according to business logic, and the business logic comprises at least one basic operation on a table of a database; Sending the first transaction to a block chain network consensus to obtain a calling address corresponding to the smart contract; And sendingthe calling address to a client which submits the first transaction. According to the technical scheme provided by the embodiment of the invention, the intelligent contract is deployed to the blockchain network, so that the service logic is linked through the intelligent contract, and the problem that the service logic is opaque is well solved.
Owner:BEIJING ZHONGXIANG BIT TECH

Alkyd resin for low-cost mixed paint and preparation method thereof

InactiveCN102702489ALow costOvercome the deep colorPhosphoric acidSolvent
The invention relates to an alkyd resin for a low-cost mixed paint and a preparation method thereof. The resin consists of the following components in percentage by weight: 23-26 percent of dry or semi-dry oil fatty acid, 10-14 percent of polyhydric alcohol, 12-15 percent of pure terephthalic acid, 0.5-0.7 percent of acid anhydride, 0.05-0.1 percent of hypophosphorous acid and 48-52 percent of a letdown solvent. The preparation method comprises the following steps of: feeding dry or semi-dry oil fatty acid, polyhydric alcohol, pure terephthalic acid and hypophosphorous acid into a reaction kettle; heating to 225-235 DEG C for esterifying till a resin is clear and transparent, the acid value is below 8mgKOH / g, and the viscosity is 15-25s / 25 DEG C at Grignard viscosity; cooling to 180 DEG C; adding the acid anhydride; continually performing an esterification reaction at 180-200 DEG C till the acid value of the resin is below 6mgKOH / g, and the viscosity is 20-22s / 25 DEG C at Grignard viscosity; and cooling, adding the letdown solvent, diluting and discharging. Compared with the conventional phthalic anhydride alkyd resin, the alkyd resin has the advantages: the cost is very low, and the properties such as color, luster, impact and the like of a final paint film are basically consistent.
Owner:SHENYANG SANMU CHEM

Transparent alginate mask powder capable of being peeled off wholly

The invention provides transparent alginate mask powder capable of being peeled off wholly. The transparent alginate mask powder capable of being peeled off wholly comprises a film-forming agent, a coagulant, a retarder, a humectant and a bulking agent, but does not contain diatomaceous earth, talc powder and other mineral fillers. The mask powder has the pH value of 8.0 to 8.5, is transparent after being blended with water, and is relatively mild to skin when being used for skin care; and through addition of the humectant, not only the humectant effect is improved, but also a dry edge phenomenon caused by excessively fast moisture evaporation on the periphery of a mask is avoided.
Owner:中山德尚伟业生物科技有限公司

Asset securitization management system and method based on blockchain

The invention relates to an asset securitization management system and method based on a blockchain, and the system comprises an alliance chain which consists of four types of role participants: an original equity person, an intermediary mechanism, a supervision mechanism and an investor, and the four types of role participants respectively have respective account books. Data recorded in account books of the four types of role participants are kept consistent, the four types of role participants are connected with a consensus service network, and the consensus service network performs identityauthentication on each role participant according to the certificate trust chain; and the control module is used for performing node election, account book data consistency verification and data synchronization control on the four role participants so as to ensure that the account book data of the four role participants is consistent. Compared with the prior art, by constructing the distributed system, the basic asset information and the project operation information are synchronously uploaded in the whole process, the whole-network real-time sharing of the data is realized, the uploaded datacan be tracked and audited and cannot be randomly tampered, and the credibility of the data subsequently acquired by a user is also ensured.
Owner:BANK OF COMMUNICATIONS

High-transparency polyvinyl alcohol hydrogel as well as preparation method and application thereof

The invention provides high-transparency polyvinyl alcohol hydrogel as well as a preparation method and application thereof. According to the high-transparency polyvinyl alcohol hydrogel, polyvinyl alcohol and inorganic salt are used as raw materials, water is used as a solvent, the concentration of the polyvinyl alcohol is 3-30 wt%, and the concentration of the inorganic salt is 0.5-29.9 wt%. The method disclosed by the invention is green and environment-friendly, and the prepared polyvinyl alcohol hydrogel has high transparency, adhesion and ultralow-temperature freezing resistance, and has elasticity, ductility, ionic conductivity and moisture retention, so that the problems of non-transparency, no adhesion, no freezing resistance and the like of the polyvinyl alcohol hydrogel during application are solved, and the prepared polyvinyl alcohol hydrogel can be applied to the fields of medicines, materials and sensors.
Owner:QINGDAO UNIV

Fully biodegradable component-toughened PLA composite material and preparation method thereof

The invention discloses a fully biodegradable component-toughened PLA composite material and a preparation method thereof. The material is prepared from, by weight, 66-95.9 parts of polylactic acid, 3-15 parts of an alginic acid natural polymer, 1-18 parts of vegetable oil or derivatives thereof and 0.1-1.0 part of an alkaline catalyst. The preparation method comprises the following steps of drying the components, conducting blending and granulating in an internal mixer, then putting granules into an extruder for extrusion, and performing injection molding by an injection molding machine. Thecomposite material has the advantages that the production cost is low, the material is biodegradable, a plasticizer is unlikely to permeate and migrate, no pollution is caused, a good toughening effect is achieved, and the mechanical property is excellent.
Owner:GUIZHOU UNIV

Dangerous chemical supervision system based on block chain

The invention belongs to the technical field of dangerous goods supervision, and particularly relates to a dangerous chemical supervision system based on a block chain. The invention discloses a dangerous chemical supervision system based on thea block chain. The dangerous chemical supervision system comprises enterprise nodes, supervision nodes, a bottom layer chain for storing information, a decentralized attribute password service and a system contract layer for executing main supervision functions, wherein the enterprise nodes are related enterprises participating in the links of dangerouschemical production, transaction, transportation and the like; the supervision node is composed of related supervision departments, and the system binds the flow of dangerous chemicals with an enterprise through the traceability and unchangeable characteristics of a block chain, thereby achieving the whole-process supervision of the production, circulation and use of dangerous chemicals. Besides,the introduction of the decentralized attribute password enables the system to realize refined authority management and control, and each supervision department only acquires necessary data, therebyreducing the risk of data leakage and abuse.
Owner:FUDAN UNIV

Resource expected result auditing method and device based on block chain and computer equipment

The invention discloses a resource expected result auditing method and device based on a block chain, computer equipment and a storage medium. The method comprises the following steps: extracting first data from a preset first block chain network; acquiring second data of the resources acquired in real time, and acquiring a function H (t) according to a formula: H (t) = min (G (t), m), wherein E (t) = F (t)-f (t); according to a formula: a normal time ratio = the first time duration / (the first time duration + the second time duration), if the normal time proportion is greater than a preset proportion threshold, generating a resource expected result; sending the resource expected result to a plurality of auditing block chain nodes; receiving return information of auditing the resource expected results by a plurality of resource expected result auditing block chain nodes; and if a preset block chain recording condition is satisfied, recording the resource expected result into the secondblock chain network. Therefore, the efficiency, safety and reliability of resource expected result auditing and the transparency of the auditing process are improved.
Owner:PING AN TECH (SHENZHEN) CO LTD

Lottery drawing method and system based on electronic device terminal and user competition

The present invention discloses a lottery drawing method and system based on an electronic device terminal and user competition. The method is characterized in that users participate in a lottery drawing activity on the electronic device terminal and send player killing (PK) signals to a server terminal, wherein the PK signals are elements in a specific set, are selected by the users or generated randomly; the server terminal receives the PK signals, pairs every two users of the same level and compares the PK signals of the paired users, the winners upgrade one level, the PK is continuously carried out on the users of the same level, and the losers are weed out and lose the lottery drawing qualification; the awards are set at the server terminal, and the users can obtain the N-level preset awards when reaching the N level.
Owner:陆丹峰

Food safety credible tracing method based on QR code

The invention discloses a food safety credible tracing method based on a QR code. The food safety credible tracing method comprises the following steps: uploading basic information of food produced bya production factory to a cloud server, and generating a unique corresponding QR code identifier on a food package; identifying the QR code identifier in the warehousing and transportation process toconfirm, collecting the related information of the food in the process and uploading the related information to a cloud server; identifying the QR code identifier in the sales process to confirm, collecting the related information of the food when the process is carried out, and uploading the related information to a cloud server; obtaining all information data of the food in the cloud server fortracing by identifying the QR code identifier on the food by a consumer; and carrying out information updating and information tracking by scanning the QR code in each process from production to sales of the food, wherein the life cycle of the whole QR code, namely all information of the food from production to consumption, can be traced back.
Owner:上海吉库信息科技有限公司

PPO/PA (poly phenylene oxide-polyamide) composite material and preparation method thereof

InactiveCN110157176AResolve opacityStrengthen the chance of formationPolyamideMelt temperature
The invention discloses a PPO / PA (poly phenylene oxide-polyamide) composite material and a preparation method thereof. The product is prepared by performing melt blending on PPO and semi-aromatic PA6I. Since molecular structures of the two components have benzene ring structures, organic compatibility among molecules can be achieved, and a compatibility problem is solved without an additional compatilizer. Meanwhile, the PA6I is low in melting temperature and excellent in transparency, and after the PA6I of a certain ratio is added into the PPO, the transparency and processing fluidity of thePPO can be improved. Compared with the conventional PPO / PA having basically equivalent product properties such as tensile strength, bending strength, impact strength, processing fluidity, heat resistance and the like, the PPO / PA composite material disclosed by the invention has the advantages that any compatilizer is not needed, the prepared product has excellent transparency, products with transparency requirements can be prepared, but the PPO / PA composite material disclosed by the invention is completely opaque.
Owner:SHANDONG DONGCHEN ENG PLASTIC

Goods attribute information processing method and device

The embodiment of the invention discloses a goods attribute information processing method and device. The method comprises the steps that a server receives first attribute information of corresponding goods submitted by a first user client side in creating a commodity object and establishes the goods information item of the commodity object in a database; second attribute information submitted by a second user client side in warehouse entering of the goods is received and accuracy arbitration is performed on the second attribute information, and the second attribute information is added in the goods information item if the accuracy meets the first preset condition; and third attribute information submitted by a third user client side in warehouse outgoing of the goods is received and accuracy arbitration is performed on the third attribute information, and the third attribute information is added in the goods information item if the accuracy meets the second preset condition. With application of the goods attribute information processing method and device, the management efficiency of the goods information can be enhanced.
Owner:CAINIAO SMART LOGISTICS HLDG LTD

Law enforcement return system and method based on smart contract and workflow architecture

The invention provides a law enforcement return system and method based on a smart contract and workflow architecture, and the system comprises a data storage layer which comprises a business information database and a blockchain system; an interface implementation layer, which comprises a workflow management module and a block link interface platform; a business logic layer, which is used for receiving and processing information submitted by courts, banks and victims based on business rules defined by the workflow management module so as to form law enforcement return workflow, and interacting with the blockchain system through the blockchain interface platform so as to realize data chaining, authority verification, data reading and fund return in the operation process of the law enforcement return workflow; and a participant interaction layer, which is used for providing information input, query and display for the user and comprises a court law enforcement cash-back management system, a bank law enforcement cash-back management system and a victim interaction system.
Owner:BOYA ZHENGLIAN (BEIJING) TECH CO LTD +2

Sample preparation device for geotechnical test

The invention discloses a sample preparation device for a geotechnical test. The sample preparation device comprises a sample preparation cylinder, a compaction rod is arranged in the sample preparation cylinder, the compaction rod is inverted T-shaped and comprises a horizontal compaction disc and a vertical rod, a test soil sample is held in the sample preparation cylinder, a connection strap isfixedly connected to a top end of the vertical rod, the connection strap is horizontally arranged, one end of the connection strap is fixedly connected with the vertical rod, the other end of the connection strap is fixedly connected with a compaction degree measurement rod, the compaction degree measurement rod is parallel to the vertical rod of the compaction rod, an observation arrow is arranged at a lower end of the compaction degree measurement rod, scale lines are vertically arranged on an outer side wall of the sample preparation cylinder, when the compaction rod is arranged in the sample preparation cylinder, the compaction disc is in contact with the surface of the test soil sample, and the height indicated by the observation arrow is the same as the height where the compaction disc is located. By adopting the sample preparation device disclosed by the invention, in a process when an experimenter compacts the soil sample, the experimenter can conveniently control the compaction degree and the smoothness of each layer of soil sample so as to make adjustment in time.
Owner:HOHAI UNIV

Railway transportation safety monitoring system

PendingCN110544026AKnow the assessment situation in real timeFair and transparent assessment resultsResourcesInternal managementInformatization
The embodiment of the invention discloses a railway transportation safety monitoring system. The railway transportation safety monitoring system mainly comprises seven sections of safety management, safety early warning, cadre job implementation, department examination, emergency disposal, equipment management and file regulations. The method mainly depends on the capability of statistical analysis and demand pre-judgment of data through informatization advantages, improves the safety management level, and achieves the purpose of deepening a three-in-one safety guarantee system of a vehicle service system. Meanwhile, the internal management level of the vehicle service system is improved through informatization means, and the integrated mode of management and production hooking and production and safety hooking is achieved.
Owner:沈阳风驰软件股份有限公司

Express delivery management system using cloud communication

InactiveCN110322084AResolve time conflictsLow costResourcesLogisticsCloud communicationsComputer science
The invention discloses an express delivery management system utilizing cloud communication. The express delivery management system comprises a self-service terminal management server, an express delivery personnel mobile phone APP, a user mobile phone APP, a communication base station, a plurality of express delivery company servers and a plurality of self-service express delivery devices. The problems that in the prior art, an offline stationing office mode is adopted for express enterprises, expenditure on the enterprises is large, express price information is not transparent, and selectionof people is not facilitated are solved. The problems that in the prior art, an intermediate service station is arranged in a community, goods of all express companies are sorted and distributed in aunified mode, the working efficiency is low, the rent cost is high, people cannot arrange their own time together, and express mailing is inconvenient are solved.
Owner:吴勇群

Method for preparing hydrophobic transparent vanadium dioxide thermochromic smart glass by electrospinning technology

The invention discloses a method for preparing hydrophobic transparent vanadium dioxide thermochromic smart glass by an electrospinning technology. The method comprises (1) adding vanadium dioxide nano-powder into a solvent, carrying out ultrasonic dispersion for 1 to 6 hours, then adding a polymer into the dispersion, and carrying out stirring until complete dissolution to obtain an electrospinning solution, (2) carrying out electrospinning through glass as a receiving substrate and an electrospinning solution obtained in the step (1) to obtain an electrospun composite fiber membrane, and (3)filling the electrospun composite fiber membrane obtained in the step (2) with a solvent and carrying out drying to obtain hydrophobic transparent vanadium dioxide thermochromic smart glass. Throughcombination of the solution filling method and an electrospinning method, the hydrophobic transparent vanadium dioxide thermochromic smart glass is obtained. The method is simple and effective, greatly broadens the application of the electrospinning material in optical materials, provides a new idea for the intelligent energy-saving window, solves the problem that the existing electrospun composite film is non-transparent and makes up for the defects that the electrospun material is not suitable for the field of optics.
Owner:GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI +1

Team bidding system and method

PendingCN112712326ASolving the inability to bid on complex projectsResolve opacityOffice automationCommerceThe InternetUser management
The invention provides a team bidding system and method, and relates to the technical field of the Internet, the team bidding system comprises a system server and a plurality of terminals in communication connection with the system server, and the system server is provided with a user management module, a service demand management module, a bidding document generation module, a project team management module and a project contract management module; team bidding software runs on the terminal and comprises a user registration and login module, a service demand acquisition module, a bidding document release module, a project team establishment module and a project contract signing module. Based on the Internet technology, personal service providers can perform team bidding by themselves.
Owner:上海闪时信息科技有限公司

Self-service express management method based on Internet of Things

The invention discloses a self-service express management method based on the Internet of Things, and the method comprises the following steps: A, a weighing device collecting the weight information of an object, triggering a scanning device, and the weighing device collecting the weight of the object and transmits the weight to a central processing unit; the size scanner automatically scanning size information and image information of an object and transmits the information to the central processing unit; automatically matching a system program in the central processing unit with the storagebox according to an existing container distribution method. By means of the method, the problems that in the prior art, an express enterprise adopts an offline stationing office mode, expenditure on the enterprise is large, express price information is not transparent, and selection of people is not facilitated can be solved. The problems that in the prior art, intermediate service stations are arranged in a community, the goods of all express companies are sorted and distributed in a unified mode, the working efficiency is low, the rent cost is high, and it is not beneficial for people to arrange the time of themselves together and send expresses conveniently are solved.
Owner:吴勇群

Non-motor vehicle garage management system and parking space system

The invention discloses a non-motor vehicle garage management system and a parking space system, and relates to the technical field of non-motor vehicle management. The system comprises a front-end user module, the front-end user module comprises a man-machine interaction end, and the front-end user module is in communication connection with a background system module; the background system module is in communication connection with the data server; the system also comprises a parking space system, the parking space system is internally provided with a scanning device, and the scanning device is in communication with the background system module; an access control system is further arranged, and the access control system is in communication connection with the background system module; the purposes of efficiently and accurately managing non-motor vehicles, avoiding disordered parking and remote management are achieved.
Owner:四川丁源信息科技有限公司

Blockchain-based distributed commodity data storage system, circulation and traceability method

The invention discloses a distributed commodity data storage system, circulation and traceability method based on blockchain, and relates to the field of data traceability; the system is deployed in a consortium chain manner, including multiple super nodes and multiple ordinary nodes; the invention solves the problem of It solves the problem of opaque transaction data in the current commodity production and circulation chains, and uses the non-tamperable characteristics of blockchain to reduce trust friction between enterprises and between enterprises and regulatory authorities; it solves the problem of high storage pressure on centralized traceability platforms To solve the problem, the detailed information of the production and circulation links are scattered and stored in the database of each enterprise node, and the hash code is used to ensure that these data will not be tampered with without authorization by the enterprise; it solves the problem of incomplete traceability data in the supply chain and difficulty in locating responsibility. Code as the core, combined with box code association, mobile payment and other means, records all information in the entire life cycle, quickly locates the responsible party when quality problems occur, and sends recall notices to relevant enterprises and consumers.
Owner:广州中科易德科技有限公司

Method and system for financing account receivable pool based on block chain, equipment and storage medium

The invention discloses a method and system for financing an account receivable pool based on a block chain, equipment and a storage medium, and the method makes full use of a distributed account book technology, an asymmetric encryption technology, an intelligent contract technology, a Hash algorithm, a digital signature and identity authentication technology and the like in the block chain, so that the financing process of the account receivable pool is more convenient and reliable, certificates such as contracts and transaction receipts generated in each financing process can be stored on the chain, each item is unique and accurate, and the problems of virtual transactions, virtual prices and the like do not exist. Many items in the process can be directly and automatically completed through the smart contract of the block chain, the offline confirmation cost is reduced, the business efficiency is improved, a financing bank does not need to carry out account receivable collection after the financing money is issued, the corresponding smart contract can be automatically triggered when a default situation occurs, and the management risk of financing bank nodes is reduced.
Owner:HUNAN UNIV

Commodity manufacturing processing method and device and electronic equipment

The invention discloses a commodity manufacturing processing method and device, and electronic equipment. The commodity manufacturing processing method comprises the steps of obtaining a commodity manufacturing picture collected in a manufacturing process in a commodity manufacturing process; obtaining order information, wherein the order information carries commodity information; and matching thecommodity information with the commodity manufacturing picture, and determining an association relationship between the commodity and the order in the manufacturing process.
Owner:ALIBABA GRP HLDG LTD

Private data comparison method and system

The invention relates to a private data comparison method and system, and the system comprises a server comprising participants, and a blockchain node correspondingly deployed for each participant, wherein different blockchain nodes form a blockchain network; each blockchain node comprises an account book and an intelligent contract which are stored based on a blockchain; the server of each participant uplinks the first public key, the second vector and the comparison result into an account book corresponding to the blockchain by calling the intelligent contract corresponding to the blockchain node, and broadcasts hash values of uplink transactions to the servers of the other participants; or queries the first public key, the second vector and the comparison result on the account book query chain corresponding to the blockchain. Private data privacy of two comparison parties can be protected, the intermediate process and the comparison result can be inquired according to the uplink hash, and the process is more transparent.
Owner:北京链飞未来科技有限公司

Medicinal low-temperature-resistant toughening anti-gamma ray impact-resistant transparent polypropylene material and preparation method thereof

The invention discloses a medicinal low-temperature-resistant toughening anti-gamma ray impact-resistant transparent polypropylene material and a preparation method thereof. The medicinal low-temperature-resistant toughening anti-gamma ray impact-resistant transparent polypropylene material is prepared by completely mixing a base material, a flexibilizer, a gamma shielding auxiliary agent, a transparent nucleating agent, an antioxidant, a lubricant, a brightening agent and a molecular weight regulator according to the proportion, wherein homopolymerized polypropylene serves as the base material. An ethylene-octylene-propylene ternary random copolymer is adopted, so the medicinal low-temperature-resistant toughening anti-gamma ray impact-resistant transparent polypropylene material has excellent toughness and impact resistance and low-temperature resistance, is transparent, and fundamentally solves the problem that a medicinal polypropylene material is not transparent. A reactive type hindered amine stabilizing agent is grafted on a polypropylene molecular chain by a reaction extrusion method, so the gamma ray resistance is improved. After the medicinal polypropylene material prepared by the method is subjected to 25-kilojoule gamma irradiation, the yellowing index is less than 1; and then a moulding part is placed in a 70-DEG C baking oven for 8 weeks, the yellowing index is 3, the comprehensive mechanical property is reduced by 5 percent, and the transparency maintains over 90 percent.
Owner:苏州晋圣博高分子材料科技有限公司

Portable oil level detector and using method thereof

The invention discloses a portable oil level detector and a using method thereof, and relates to the field of electrical device maintenance. The portable oil level detector comprises an insulating shell, a positioning magnetic sheet, a pulse transmitting circuit, a pulse receiving circuit, a counter, an oscillating circuit, a liquid level alarm lamp, a control circuit and a power supply module. The portable oil level detector is adsorbed on the wall of an oil storage tank or a transformer oil tank through the positioning magnetic sheet, when liquid exists in the oil storage tank or the transformer oil tank, the liquid level alarm lamp flickers, otherwise, the liquid level alarm lamp is not turned on, so that the problem that the oil storage tank or the transformer oil tank is made of an iron plate and is not transparent, so that whether oil exists or not in the oil storage tank or the transformer oil tank cannot be accurately judged, and the maintenance work is not convenient, is solved. The internal oil level position can also be determined when the detector slowly moves on the wall of the oil storage tank or the transformer oil tank, and the liquid level alarm lamp flickers and is not lighted alternately, and the technical problem that the oil level position is difficult to judge is solved. The detector is small in size, is convenient and flexible, enables the overhaul operation efficiency to be improved.
Owner:GUANGXI POWER GRID CO LIUZHOU POWER SUPPLY BUREAU

Smart contract deployment, calling methods and devices

The invention discloses an intelligent contract deployment and calling method and device. The intelligent contract deployment method is executed by block chain nodes and comprises the steps of receiving a first transaction containing byte codes of an intelligent contract, wherein the intelligent contract is compiled and compiled in advance according to business logic, and the business logic comprises at least one basic operation on a table of a database; Sending the first transaction to a block chain network consensus to obtain a calling address corresponding to the smart contract; And sendingthe calling address to a client which submits the first transaction. According to the technical scheme provided by the embodiment of the invention, the intelligent contract is deployed to the blockchain network, so that the service logic is linked through the intelligent contract, and the problem that the service logic is opaque is well solved.
Owner:BEIJING ZHONGXIANG BIT TECH
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