CN111260412A - Reward distribution method, device and medium of online question-answering platform based on block chain - Google Patents
Reward distribution method, device and medium of online question-answering platform based on block chain Download PDFInfo
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Abstract
The application discloses a reward distribution method, equipment and a method of an online question-answering platform based on a block chain, wherein a service node can receive answer data from an expert terminal, and the answer data corresponds to question data sent to the service node by a first user terminal; after receiving confirmation information generated by the user terminal aiming at the answer data, the service node sends prompt information to the user terminal so that the user terminal pays corresponding rewards to the service node according to the prompt information; the service node determines an award value corresponding to the answer data according to the award paid by the user terminal and based on a first award distribution intelligent contract arranged on the block chain; the service node adds the reward value corresponding to the answer data to the reward value of the reward account of the expert corresponding to the answer data; and writing the reward value corresponding to the answer data into the block chain for storage.
Description
Technical Field
The present application relates to the field of computer technologies, and in particular, to a reward distribution method, device, and medium for an online question-and-answer platform based on a blockchain.
Background
With the development of communication technology, more and more online question-answering platforms are generated. The user can submit own problems on the corresponding online question-answering platform, and the corresponding experts can reside in the platform and answer the problems proposed by the user, so that a solution can be provided for the problems proposed by the user.
After the expert provides a solution for solving the user's problem, if the user adopts the solution, the user can pay corresponding rewards (for example, commission) to the expert through the online questioning and answering platform, but in the prior art, the rewards issued by the online questioning and answering platform are not public and have low credibility, and related data can be tampered, thereby causing corresponding loss.
Disclosure of Invention
The embodiment of the specification provides a reward distribution method, device and medium for an online question-answering platform based on a block chain, and is used for solving the following technical problems in the prior art: when the online question and answer platform distributes the rewards, the credibility is low, and the related data can be falsified, thereby causing corresponding loss.
The embodiment of the specification adopts the following technical scheme:
a reward distribution method of an online questioning and answering platform based on a block chain is applied to a block chain network, the block chain network comprises at least one service node, the service node corresponds to an online questioning and answering platform service node, and the method comprises the following steps:
the service node receives answer data from an expert terminal, wherein the answer data corresponds to question data sent to the service node by a first user terminal;
after receiving the confirmation information generated by the user terminal aiming at the answer data, the service node sends prompt information to the user terminal so that the user terminal pays corresponding rewards to the service node according to the prompt information;
the service node determines an incentive value corresponding to the answer data according to the incentive paid by the user terminal and based on a first incentive distribution intelligent contract deployed on the block chain;
the service node adds the reward value corresponding to the answer data to the reward value of the reward account of the expert corresponding to the answer data; and
and writing the reward value corresponding to the answer data into the block chain for storage.
Optionally, the first reward distribution smart contract is specifically:
and determining the reward value corresponding to the answer data according to the reward paid by the first user terminal according to a preset share mechanism.
Optionally, the service node receives a viewing answer request message from a second user terminal;
the service node generates corresponding feedback information according to the question data in the answer viewing request message, so that the second user terminal can pay corresponding rewards to the service node according to the feedback information; wherein the feedback information comprises an award value paid by the second user terminal;
the service node determines the reward value of answer data corresponding to the question data according to the corresponding reward paid by the second user terminal and a second reward distribution intelligent contract deployed on the blockchain;
and adding the reward value of the answer data into the reward value of the reward account of the expert corresponding to the answer data.
Optionally, the second reward distribution intelligent contract specifically includes:
determining question data in the answer viewing request message and corresponding answer data;
determining a number of times the answer data is viewed;
and determining the reward value corresponding to the answer data according to the number of times the answer data is viewed and the corresponding reward paid by the second user terminal.
Optionally, the method further comprises: determining a reward value of an online question and answer platform according to the reward paid by the first user terminal based on a first reward distribution intelligent contract deployed on the blockchain;
and adding the reward value of the online question and answer platform into the reward value of a reward account corresponding to the online question and answer platform.
Optionally, the method further comprises: the service node receives a specified question request message from a third user terminal, wherein the specified question request message comprises: problem data, expert information;
and the service node sends prompt information to a terminal corresponding to the expert information according to the expert information, wherein the prompt information is used for prompting the expert that the expert has a problem and appoints the expert to answer.
Optionally, the method further comprises: and writing the problem data from the first user terminal into the block chain for storage.
Optionally, the reward comprises at least one of: bonus points and bonus.
Optionally, the method further comprises: and writing the reward value paid by the first user terminal into the block chain for storage.
A reward distribution device of an online questioning and answering platform based on a blockchain, the device being a service node of a blockchain network, the blockchain network comprising at least one service node, the service node corresponding to the online questioning and answering platform, the device comprising:
at least one processor; and the number of the first and second groups,
a memory communicatively coupled to the at least one processor; wherein the content of the first and second substances,
the memory stores instructions executable by the at least one processor to enable the at least one processor to:
receiving answer data from an expert terminal, wherein the answer data corresponds to question data sent to the service node by a first user terminal;
after receiving confirmation information generated by the user terminal aiming at the answer data, sending prompt information to the user terminal so that the user terminal pays corresponding rewards to the service node according to the prompt information;
determining an incentive value corresponding to the answer data according to the incentive paid by the user terminal and based on a first incentive distribution intelligent contract deployed on the blockchain;
adding the reward value corresponding to the answer data into the reward value of the reward account of the expert corresponding to the answer data; and
and writing the reward value corresponding to the answer data into the block chain for storage.
A non-transitory computer storage medium for reward distribution for a blockchain based online question-answering platform, storing computer-executable instructions configured to:
receiving answer data from an expert terminal, wherein the answer data corresponds to question data sent to the service node by a first user terminal;
after receiving confirmation information generated by the user terminal aiming at the answer data, sending prompt information to the user terminal so that the user terminal pays corresponding rewards to the service node according to the prompt information;
determining an incentive value corresponding to the answer data according to the incentive paid by the user terminal and based on a first incentive distribution intelligent contract deployed on the blockchain;
adding the reward value corresponding to the answer data into the reward value of the reward account of the expert corresponding to the answer data; and
and writing the reward value corresponding to the answer data into the block chain for storage.
The embodiment of the specification adopts at least one technical scheme which can achieve the following beneficial effects: the system can realize user question asking and expert answering, and can distribute rewards paid by the user to corresponding experts and platforms through intelligent contracts deployed on the blockchain, and the rewards are transparent and public in rules and are not easy to be tampered. And, write the assigned bonus value into the block chain, can prevent the data from being tampered, thus cause the corresponding loss.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
fig. 1 is a flowchart of a reward distribution method of an online question-answering platform based on a block chain according to an embodiment of the present specification;
fig. 2 is a schematic structural diagram of a reward distribution device of an online question-answering platform based on a block chain according to an embodiment of the present disclosure.
Detailed Description
In order to make the objects, technical solutions and advantages of the present disclosure more apparent, the technical solutions of the present disclosure will be clearly and completely described below with reference to the specific embodiments of the present disclosure and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by a person skilled in the art without making any inventive step based on the embodiments in the description belong to the protection scope of the present application.
The technical solutions provided by the embodiments of the present application are described in detail below with reference to the accompanying drawings.
The embodiment of the application provides a reward distribution method of an online question-answering platform based on a block chain. The block chain network can also comprise at least one user node and at least one expert node, wherein the user node corresponds to a user terminal, and the expert node corresponds to terminal equipment of an expert.
The Blockchain (Blockchain) is a novel application mode of computer technologies such as distributed data storage, point-to-point transmission, a consensus mechanism, an encryption algorithm and the like, and is essentially a decentralized database.
The blockchain network may refer to a blockchain platform built based on a blockchain framework, where the blockchain framework may be any blockchain framework capable of implementing corresponding functions of the embodiments of the present application, for example, bitcoin, etherhouse, Fabric, Corda, and the like. A blockchain platform may refer to a platform that stores a blockchain, e.g., may be a distributed system, etc. Of course, the blockchain platform may also directly represent the blockchain network itself, and is not limited herein.
Fig. 1 is a flowchart of a reward distribution method of an online question-answering platform based on a block chain according to an embodiment of the present specification. The method comprises the following steps:
and S101, the service node receives answer data from the expert terminal.
Wherein the answer data corresponds to question data sent by the first user terminal to the service node.
Before step S101, the first user terminal may send the question data to the service node, and the service node displays the question data to the expert through the corresponding online question-and-answer platform.
It should be noted that, the first user terminal refers to a terminal device used by a user, and the expert terminal refers to a terminal device used by an expert, for example: electronic devices with communication capabilities, such as smart phones and tablet computers. The user as referred to herein means a person who presents a question, and the specialist means a person who answers the question. Since the domain of the problem is different, one person can be an instant user and also an expert.
And S102, after receiving the confirmation information generated by the user terminal aiming at the answer data, the service node sends prompt information to the user terminal so that the user terminal pays corresponding rewards to the service node according to the prompt information.
Before step S102, the service node is required to display the answer data to the user who has made a question through the corresponding prior question-and-answer platform.
And sending confirmation information to the service node through the user terminal under the condition that the user adopts the answer data, wherein the confirmation information is generated according to the answer data.
And after receiving the confirmation information, the service node sends prompt information to the user terminal, wherein the prompt information comprises the reward value which needs to be paid by the user.
And the user terminal pays corresponding rewards to the service node according to the prompt information.
In some embodiments of the present application, the reward includes at least one of: bonus points and bonus. The bonus points may be purchased by the user or may be obtained by answering questions of other users. The reward points may also be redeemed for a corresponding amount.
In some embodiments of the present application, the service node may further write the reward value paid by the first user terminal into the blockchain for storage, so as to prevent data from being tampered. Moreover, under the condition that the blockchain network comprises the user nodes, the user node corresponding to the first user terminal can write the reward value paid by the first user terminal into the blockchain for storage, so that the mutual impoverishment can be avoided according to the reward value when disputes occur.
And S103, the service node determines the reward corresponding to the answer data according to the reward paid by the user terminal and based on the first reward distribution intelligent contract arranged on the block chain.
In some embodiments of the present application, the first reward distribution smart contract is specifically:
and determining the reward corresponding to the answer data according to the reward paid by the first user terminal according to a preset dividing mechanism.
For example, the default partitioning mechanism is: if the expert is 70%, if the reward paid by the first user terminal is 10 yuan, the reward value corresponding to the answer data is 7 yuan.
And S104, adding the reward value corresponding to the answer data into the reward value of the reward account of the expert corresponding to the answer data by the service node.
In some embodiments of the application, the reward value of the online question-answering platform may also be determined according to the reward paid by the first user terminal based on the first reward distribution intelligent contract deployed on the blockchain; and adding the reward value of the online question and answer platform into the reward value of a reward account corresponding to the online question and answer platform.
Through the scheme, the rewards paid by the user terminal can be distributed to corresponding experts and platforms based on intelligent contracts deployed on the blockchain.
And S105, the service node writes the reward value corresponding to the answer data into the block chain for storage.
The service node writes the reward value corresponding to the answer data into the block chain, so that the data can be prevented from being tampered, and the data can be relied when disputes occur.
In some embodiments of the present application, the problem data from the first user terminal may also be written to the blockchain for storage.
During the actual operation of the online question-and-answer platform, it may happen that a question that the user wants to ask has already been asked by other users, and corresponding answers also already exist. At this point, how to charge such users with the corresponding rewards. In some embodiments of the present application, a solution to the above problem is proposed, as follows:
the service node receives a viewing answer request message from the second user terminal.
And the service node generates corresponding feedback information according to the question data in the answer checking request message, so that the second user terminal can pay corresponding rewards to the service node according to the feedback information.
Wherein the feedback information comprises the reward value paid by the second user terminal.
And the service node determines the reward value of answer data corresponding to the question data according to the corresponding reward paid by the second user terminal and a second reward distribution intelligent contract deployed on the blockchain.
And adding the reward value of the answer data to the reward value of the reward account of the expert corresponding to the answer data.
Through the scheme, the corresponding reward can be charged for the user who views the published answer.
In some embodiments of the present application, the second reward distributes smart contracts, specifically:
and determining question data in the answer request message to be checked and corresponding answer data.
The number of times the answer data is viewed is determined.
And determining the reward value corresponding to the answer data according to the number of times the answer data is viewed and the corresponding reward paid by the second user terminal.
Through the scheme, the reward value corresponding to the answer data can be determined according to the number of times the answer data is viewed, for example, the reward value corresponding to the answer data can be properly reduced when the number of viewed times is larger, and the reward value corresponding to the platform is increased.
In addition, in the embodiment of the present application, the reward collected may also be appropriately adjusted according to the number of times the answer data is viewed, for example, the reward collected by the user is less when the number of times the answer data is viewed is greater, so as to encourage more users to adopt the answer data.
In the practical process of the online question-and-answer platform, some users want to specify corresponding experts to answer, so in some embodiments of the present application, the service node receives a specified question request message from a third user terminal, where the specified question request message includes: problem data, expert information. And the service node sends prompt information to the terminal corresponding to the expert information according to the expert information, wherein the prompt information is used for prompting the expert that the expert has a problem and appoints the expert to answer.
Through the scheme, the user can select the corresponding expert to provide answer data, and the online question-answering platform is more humanized.
Based on the scheme, the user can ask questions and solve expert answers, and the rewards paid by the user can be distributed to corresponding experts and platforms through intelligent contracts deployed on the blockchain, so that the rules are transparently disclosed, and the user cannot be easily tampered. And, write the assigned bonus value into the block chain, can prevent the data from being tampered, thus cause the corresponding loss.
Based on the same idea, some embodiments of the present application further provide a device and a non-volatile computer storage medium corresponding to the above method.
Fig. 2 is a schematic structural diagram of a reward distribution device of an online questioning and answering platform based on a blockchain according to an embodiment of the present disclosure, as shown in fig. 2, the device is a service node of a blockchain network, the blockchain network includes at least one service node, the service node corresponds to the online questioning and answering platform, and the device includes:
at least one processor; and the number of the first and second groups,
a memory communicatively coupled to the at least one processor; wherein the content of the first and second substances,
the memory stores instructions executable by the at least one processor to enable the at least one processor to:
receiving answer data from an expert terminal, wherein the answer data corresponds to question data sent to the service node by a first user terminal;
after receiving confirmation information generated by the user terminal aiming at the answer data, sending prompt information to the user terminal so that the user terminal pays corresponding rewards to the service node according to the prompt information;
determining an incentive value corresponding to the answer data according to the incentive paid by the user terminal and based on a first incentive distribution intelligent contract deployed on the blockchain;
adding the reward value corresponding to the answer data into the reward value of the reward account of the expert corresponding to the answer data; and
and writing the reward value corresponding to the answer data into the block chain for storage.
Some embodiments of the present application provide a non-transitory computer storage medium corresponding to reward distribution of a blockchain-based online question-answering platform of fig. 1, storing computer-executable instructions configured to:
receiving answer data from an expert terminal, wherein the answer data corresponds to question data sent to the service node by a first user terminal;
after receiving confirmation information generated by the user terminal aiming at the answer data, sending prompt information to the user terminal so that the user terminal pays corresponding rewards to the service node according to the prompt information;
determining an incentive value corresponding to the answer data according to the incentive paid by the user terminal and based on a first incentive distribution intelligent contract deployed on the blockchain;
adding the reward value corresponding to the answer data into the reward value of the reward account of the expert corresponding to the answer data; and
and writing the reward value corresponding to the answer data into the block chain for storage. The embodiments in the present application are described in a progressive manner, and the same and similar parts among the embodiments can be referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the device and media embodiments, the description is relatively simple as it is substantially similar to the method embodiments, and reference may be made to some descriptions of the method embodiments for relevant points.
The device and the medium provided by the embodiment of the application correspond to the method one to one, so the device and the medium also have the similar beneficial technical effects as the corresponding method, and the beneficial technical effects of the method are explained in detail above, so the beneficial technical effects of the device and the medium are not repeated herein.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In a typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
The memory may include forms of volatile memory in a computer readable medium, Random Access Memory (RAM) and/or non-volatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM). Memory is an example of a computer-readable medium.
Computer-readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, 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 disc read only memory (CD-ROM), Digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device. As defined herein, a computer readable medium does not include a transitory computer readable medium such as a modulated data signal and a carrier wave.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. 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 (10)
1. A reward distribution method of an online questioning and answering platform based on a block chain is characterized in that the method is applied to a block chain network, the block chain network comprises at least one service node, the service node corresponds to an online questioning and answering platform service node, and the method comprises the following steps:
the service node receives answer data from an expert terminal, wherein the answer data corresponds to question data sent to the service node by a first user terminal;
after receiving the confirmation information generated by the user terminal aiming at the answer data, the service node sends prompt information to the user terminal so that the user terminal pays corresponding rewards to the service node according to the prompt information;
the service node determines an incentive value corresponding to the answer data according to the incentive paid by the user terminal and based on a first incentive distribution intelligent contract deployed on the block chain;
the service node adds the reward value corresponding to the answer data to the reward value of the reward account of the expert corresponding to the answer data; and
and writing the reward value corresponding to the answer data into the block chain for storage.
2. The method of claim 1, wherein the first reward distribution smart contract is specifically:
and determining the reward value corresponding to the answer data according to the reward paid by the first user terminal according to a preset share mechanism.
3. The method of claim 1, further comprising:
the service node receives a viewing answer request message from a second user terminal;
the service node generates corresponding feedback information according to the question data in the answer viewing request message, so that the second user terminal can pay corresponding rewards to the service node according to the feedback information; wherein the feedback information comprises an award value paid by the second user terminal;
the service node determines the reward value of answer data corresponding to the question data according to the corresponding reward paid by the second user terminal and a second reward distribution intelligent contract deployed on the blockchain;
and adding the reward value of the answer data into the reward value of the reward account of the expert corresponding to the answer data.
4. A method according to claim 3, wherein the second reward distributes smart contracts, in particular:
determining question data in the answer viewing request message and corresponding answer data;
determining a number of times the answer data is viewed;
and determining the reward value corresponding to the answer data according to the number of times the answer data is viewed and the corresponding reward paid by the second user terminal.
5. The method of claim 1, further comprising:
determining a reward value of an online question and answer platform according to the reward paid by the first user terminal based on a first reward distribution intelligent contract deployed on the blockchain;
and adding the reward value of the online question and answer platform into the reward value of a reward account corresponding to the online question and answer platform.
6. The method of claim 1, further comprising:
the service node receives a specified question request message from a third user terminal, wherein the specified question request message comprises: problem data, expert information;
and the service node sends prompt information to a terminal corresponding to the expert information according to the expert information, wherein the prompt information is used for prompting the expert that the expert has a problem and appoints the expert to answer.
7. The method of claim 1, wherein the reward comprises at least one of: bonus points and bonus.
8. The method of claim 1, further comprising:
and writing the reward value paid by the first user terminal into the block chain for storage.
9. A reward distribution device of an online question-answering platform based on a block chain is characterized in that the device is a service node of a block chain network, the block chain network comprises at least one service node, and the service node corresponds to the online question-answering platform, and the device comprises:
at least one processor; and the number of the first and second groups,
a memory communicatively coupled to the at least one processor; wherein the content of the first and second substances,
the memory stores instructions executable by the at least one processor to enable the at least one processor to:
receiving answer data from an expert terminal, wherein the answer data corresponds to question data sent to the service node by a first user terminal;
after receiving confirmation information generated by the user terminal aiming at the answer data, sending prompt information to the user terminal so that the user terminal pays corresponding rewards to the service node according to the prompt information;
determining an incentive value corresponding to the answer data according to the incentive paid by the user terminal and based on a first incentive distribution intelligent contract deployed on the blockchain;
adding the reward value corresponding to the answer data into the reward value of the reward account of the expert corresponding to the answer data; and
and writing the reward value corresponding to the answer data into the block chain for storage.
10. A non-transitory computer storage medium for reward distribution for a blockchain based online question-answering platform, storing computer-executable instructions configured to:
receiving answer data from an expert terminal, wherein the answer data corresponds to question data sent to a service node by a first user terminal;
after receiving confirmation information generated by the user terminal aiming at the answer data, sending prompt information to the user terminal so that the user terminal pays corresponding rewards to the service node according to the prompt information;
determining an incentive value corresponding to the answer data according to the incentive paid by the user terminal and based on a first incentive distribution intelligent contract deployed on the blockchain;
adding the reward value corresponding to the answer data into the reward value of the reward account of the expert corresponding to the answer data; and
and writing the reward value corresponding to the answer data into the block chain for storage.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111915349A (en) * | 2020-07-08 | 2020-11-10 | 广州汇才创智科技有限公司 | Cross-platform integral using system and method based on block chain |
| CN113743997A (en) * | 2021-09-18 | 2021-12-03 | 中国银行股份有限公司 | Online movement task execution method and device |
| CN114511357A (en) * | 2022-02-15 | 2022-05-17 | 北京大学 | Problem solution excitation method and device based on block chain |
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2020
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111915349A (en) * | 2020-07-08 | 2020-11-10 | 广州汇才创智科技有限公司 | Cross-platform integral using system and method based on block chain |
| CN113743997A (en) * | 2021-09-18 | 2021-12-03 | 中国银行股份有限公司 | Online movement task execution method and device |
| CN114511357A (en) * | 2022-02-15 | 2022-05-17 | 北京大学 | Problem solution excitation method and device based on block chain |
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