KR20200044363A - Method for managing trust information based on block-chain - Google Patents

Abstract

Disclosed is a method for managing reliability information based on blockchain to increase security and safety. According to one embodiment of the present invention, the method for managing reliability information based on blockchain comprises the steps of: calculating reliability information; distributing, recording, and storing the calculated reliability information in blockchain; and managing the reliability information stored in the blockchain by a smart contract. The step of calculating the reliability information includes a step of calculating an evaluation score for a person to be evaluated and a step of calculating a reputation score for the person to be evaluated based on the calculated evaluation score.

Description

Method for managing trust information based on block-chain}

The present invention relates to blockchain technology.

Block-chain technology is the basis of cryptocurrency such as Bitcoin, and is an Internet trust infrastructure technology that can be applied to various industries that require trust such as public, logistics, and medical. Trust is the belief that the other person can safely and effectively deliver the service (product) to me. Blockchain is a second Internet that can exchange highly reliable values (assets), and is a market-destructive new technology that can create new Google, Naver, etc.

The existing Internet is vulnerable to security by responding to post-security methods for each cyber attack type, but the blockchain can be prevented in advance at the infrastructure level. Existing Internet services are experiencing the issue of “One-way Trust,” a trust of platform-oriented services. For example, there is a possibility of personal information leakage and forgery and alteration due to hacking of the central server, and there is a possibility of high relay fees and information manipulation by platform operators. In addition, there is a serious gap in the amount and quality of information held by each entity in the transaction, such as platform operators, suppliers, and consumers (information asymmetry problem). Furthermore, the possibility of monitoring and control of large platform operators is emerging. For example, there is a concern that big brothers such as Google and Facebook take control of personal information and use it commercially.

According to an embodiment of the present invention, a blockchain-based reliability information management method is proposed, which increases security and stability by managing information or reliability information for a person based on a blockchain, and objectively measures and manages reliability information.

The blockchain-based reliability information management method according to an embodiment includes calculating a reliability information, distributing and storing the calculated reliability information in a blockchain, and managing the reliability information stored in the blockchain by a smart contract. To do; Comprising, the step of calculating the reliability information includes the step of calculating an evaluation score for the evaluator, and calculating the reputation score for the evaluator based on the calculated evaluation score.

In the step of calculating the evaluation score, the evaluation score for the evaluator may be calculated by combining at least one of <evaluator evaluation value, customer satisfaction contracted with the evaluator, customer reliability, and service importance of the evaluator>.

The evaluation score may be e (f, i) = E _i × S _i × C _i × V _i . e (f, i) is the evaluation score for the i-th service of the evaluator f, E _i is the evaluation value of at least one evaluator, S _i is the satisfaction of at least one customer contracted with the evaluator f, C _i is the reliability of at least one customer, and V _i is the service importance of the evaluator f.

In the step of calculating the reputation score, based on the calculated evaluation score, among the <evaluation result value for the evaluator within the first period, the evaluation result value for the evaluator within the second period, and the evaluator's profile evaluation result value> It is possible to calculate the reputation score by combining at least one. The first period is more recent than the second period.

The plate score may be r (f) = α × (∑evaluation (f) / N) + β × r '(f) + γ × profile (f). r (f) is the reputation score for evaluator f, ∑evaluation (f) / N is the evaluation result value for evaluator f in the first period, and r '(f) is for evaluator f in the second period. Is the evaluation result value, profile (f) is the evaluation result value of the evaluator f, α, β, and γ are weights, and α + β + γ = 1. When the community activity of the evaluator f is the first time, the weight γ of the profile (f) may be 1.

The step of calculating the reliability information further includes calculating reliability prediction information that predicts the trust of the future evaluator as a reference value of the evaluator in consideration of time, wherein the reliability prediction information is <reputation score of the evaluator, It may include a reference value set by the evaluator, time>.

The step of calculating the reliability information further comprises calculating the reputation power of the group to which the evaluator belongs, and further reflecting the reputation and fidelity of the evaluator belonging to the group when calculating the reputation power. Based reliability information management method.

The blockchain-based reliability information management method further includes sharing the reliability information with other blockchain nodes, and the sharing of the reliability information includes sharing evaluation information between blockchain nodes connected through an evaluation channel and a reputation channel. It includes the step of sharing the reputation information between the blockchain nodes connected through, and the step of sharing the token information between the blockchain nodes connected through the token channel, and the evaluation channel, reputation channel, and token channel can be operated separately from each other. .

The blockchain-based reliability information management method according to another embodiment includes the steps of generating and evaluating an evaluation transaction by a user application by an evaluator who wants to evaluate the evaluator, and access control smart contract by the distributed app server receiving the evaluation transaction The step of invoking the access control smart contract to the node, the step of verifying the user access authority as the access control smart contract node verifies the user by executing the access control smart contract, and the access control smart contract node confirms the access right. When only the user calls the evaluation smart contract to the evaluation smart contract node, the evaluation smart contract node verifies the validity of the evaluation information, and the information access right is verified, and the evaluation smart contract node confirms the access right to the evaluation information. For evaluators by executing the evaluation smart contract And processing an evaluation transaction for calculating an evaluation score.

The step of confirming the user access right is to generate a one-time shared password for the evaluation session and transmit the one-time shared password to the evaluator, and when the evaluation content signature and the one-time shared password are received from the evaluator, confirm that the one-time shared password is correct and the evaluator It may include the step of inquiring the public key of the blockchain and verifying the evaluator by verifying the signature with the public key inquired, and calling the evaluation smart contract interface when the evaluator is verified.

In the step of confirming the access right to the information, the evaluation smart contract node can check forgery of the document by comparing the hash value of the user profile obtained from the off-chain DB by the distributed app server.

In the step of processing the evaluation transaction for calculating the evaluation score, the evaluation score may be calculated by combining at least one of <evaluator evaluation value, customer satisfaction contracted with the evaluator, customer reliability, and service importance of the evaluator>. .

In the block chain-based reliability information management method, according to the evaluation transaction processing of the evaluation smart contract node, the block generation node collects the final outputs of the smart contract from the evaluation smart contract node to generate a block, and the generated block is at least one block consensus node Broadcasting to the block consensus request step, and each block consensus node validates the block according to the block consensus request of the block generation node, and then sends the verification result, additionally connects the block to its blockchain, and connects it to the on-chain DB. The method may further include storing evaluation information.

The blockchain-based reliability information management method according to another embodiment includes a step in which a distributed app server calls an access control smart contract to an access control smart contract node, and the access control smart contract node executes the access control smart contract to enable the user. Verifying user access rights as verified, access control smart contract node calling the reputation smart contract to the reputation smart contract node only for users whose access rights are verified, and the reputation smart contract node executing the reputation smart contract And processing the reputation transaction to calculate the reputation score for the evaluator.

In the step of processing a reputation transaction for calculating a reputation score, at least one of <evaluation result value for the evaluator in the first period, evaluation result value for the evaluator in the second period, and the profile evaluation result value for the evaluator> The reputation score can be calculated by combining, and the first period is more recent than the second period based on the reputation calculation time.

In the step of processing the reputation transaction for calculating the reputation score, the weight α is assigned to the evaluation result value for the evaluator in the first period, the weight β is assigned to the evaluation result value for the evaluator in the second period, and The weight γ is assigned to the evaluator's profile evaluation result value, α + β + γ = 1, and when the community activity of the evaluator is the first time, the weight γ of the evaluator's profile evaluation result value may be 1.

The blockchain-based reliability information management method may further include calculating reliability prediction information that predicts trust for the future evaluator as a reference value of the evaluator in consideration of time, and the reliability prediction information is < Reputation score, reference value set by the evaluator, and time.

The blockchain-based reliability information management method may further include calculating the reputation power of the group to which the evaluator belongs, and reflecting the reputation and fidelity of the evaluator of the group when calculating the reputation power.

The block chain-based reliability information management method comprises the steps of a block generating node collecting smart contract final outputs from a reputable smart contract node to generate a block, and broadcasting the generated block to at least one block consensus node to request block consensus. Further, each block consensus node may verify the block according to the block consensus request of the block generation node, and then transmit the verification result, further connect the block to its own blockchain, and further store the reputation information in the on-chain DB. have.

Blockchain-based reliability information management method includes the steps of requesting a reputation query by generating a reputation transaction by a user application by a reputation queryer who wants to query the reputation of the evaluator, and controlling the access by the distributed app server receiving the reputation transaction The step of invoking the access control smart contract to the smart contract node, and verifying the user access authority as the access control smart contract node executes the access control smart contract to verify the user. The step of calling the reputation smart contract to the reputation smart contract node only for the identified user, and the step of inquiring the reputation information stored by the reputation smart contract node and transmitting the retrieved reputation information to the user application through the distributed app server. It can contain.

The step of checking the user access authority includes checking a user level of the reputation viewer to determine whether to control access, and when access control is confirmed, checking multi-signatures of multiple reputation managers and multiplying the evaluators and the reputation viewers. It may include the step of determining whether or not it is possible to check the signature.

The blockchain-based reliability information management method according to an embodiment may provide objective, reliability and security reliability information through a blockchain-based information trust engine.

Blockchain-based trust engines use technology to distribute and store reliability information on the blockchain to increase the reliability of Internet information transactions. As a result, autonomous direct transactions without platform operators are possible. In addition, it is possible to prevent fraudulent transactions in the Internet space and provide autonomous direct transaction services with little relay fees. In particular, reliability information capable of determining objective reliability of a product or service provider for direct transactions may be provided.

The blockchain-based reliability information management method according to an embodiment provides reliability measurement technology for reliability management of information or a person, and at this time, can provide objective reliability information so that anyone can trust.

1 is a diagram showing the concept of a blockchain-based information trust engine according to an embodiment of the present invention;
2 is a diagram showing the configuration of a blockchain-based information trust engine system according to an embodiment of the present invention;
3 is a diagram illustrating an example of sharing information between blockchain nodes based on a channel according to an embodiment of the present invention,
4 is a view showing the configuration of a blockchain node according to an embodiment of the present invention,
5 is a diagram illustrating a data flow consisting of an evaluation-token issuance-reputation inquiry transaction according to an embodiment of the present invention;
6 is a diagram illustrating a flow of a method for managing reliability information based on a blockchain according to an embodiment of the present invention,
7 is a diagram illustrating an evaluation transaction flow according to an embodiment of the present invention,
8 is a diagram illustrating a reputation calculation transaction flow according to an embodiment of the present invention,
9 is a view showing a reputation inquiry transaction flow according to an embodiment of the present invention,
10 is a diagram illustrating a token issuing transaction flow according to an embodiment of the present invention,
11 is a view showing the configuration of an information wallet according to an embodiment of the present invention,
12 is a view showing an evaluation access control process according to an embodiment of the present invention,
13 is a view showing a plate access control process according to an embodiment of the present invention,
14 is a view showing a token access control process according to an embodiment of the present invention,
15 is a view for explaining a membership management service according to an embodiment of the present invention,
16 is a diagram illustrating a reliability information measurement scenario according to an embodiment of the present invention.

Advantages and features of the present invention, and methods for achieving them will be clarified with reference to embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms, and only the embodiments allow the disclosure of the present invention to be complete, and common knowledge in the technical field to which the present invention pertains. It is provided to fully inform the holder of the scope of the invention, and the invention is only defined by the scope of the claims. The same reference numerals refer to the same components throughout the specification.

In the description of the embodiments of the present invention, when it is determined that a detailed description of known functions or configurations may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted, and terms to be described later in the embodiments of the present invention These terms are defined in consideration of the functions of the user, and may vary depending on the user's or operator's intention or customs. Therefore, the definition should be made based on the contents throughout this specification.

Combinations of each block in the accompanying block diagrams and steps of the flow charts may be performed by computer program instructions (execution engines), these computer program instructions being incorporated into a processor of a general purpose computer, special purpose computer, or other programmable data processing device. Since it can be mounted, its instructions, which are executed through a processor of a computer or other programmable data processing device, create a means to perform the functions described in each block of the block diagram or in each step of the flowchart.

These computer program instructions can also be stored in computer readable or computer readable memory that can be oriented to a computer or other programmable data processing device to implement a function in a particular way, so that computer readable or computer readable memory The instructions stored in it are also possible to produce an article of manufacture containing instructions means for performing the functions described in each block of the block diagram or in each step of the flowchart.

And since computer program instructions may be mounted on a computer or other programmable data processing device, a series of operation steps are performed on the computer or other programmable data processing device to create a process that is executed by the computer to generate a computer or other programmable It is also possible for instructions to perform the data processing apparatus to provide steps for executing the functions described in each block of the block diagram and each step of the flowchart.

In addition, each block or each step can represent a module, segment, or portion of code that includes one or more executable instructions for executing specified logical functions, and in some alternative embodiments referred to in blocks or steps It should be noted that it is possible for functions to occur out of sequence. For example, two blocks or steps shown in succession may in fact be performed substantially simultaneously, and it is also possible that the blocks or steps are performed in the reverse order of the corresponding function as necessary.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the embodiments of the present invention exemplified below may be modified in various other forms, and the scope of the present invention is not limited to the embodiments described below. Embodiments of the present invention are provided to more fully describe the present invention to those of ordinary skill in the art.

1 is a diagram illustrating the concept of a blockchain-based information trust engine according to an embodiment of the present invention.

Referring to FIG. 1, the blockchain-based information trust engine provides an information trust service capable of sharing and exchanging valuable reliability information through objective and stable reliability management between trading partners. Reliability information includes predetermined information or evaluation information for a person, reputation information, token information, and the like. The information or the person may be an object for evaluating reliability, an object for measuring reputation based on evaluation, and an object for viewing reputation. Information can be a product, a service, or the like. Services can be freelance sharing economy, recruitment, lodging sharing, vehicle sharing, real estate / used car sales services, etc. A person can be a curator, verifier, freelancer, arbitrator, or customer.

Evaluation information is information that evaluates information or a person, and reputation information is information that measures reputation based on information or evaluation information about a person. Token information is issued as a reward for performing a certain transaction. For example, it is issued as a reward for performing an evaluation, and the issued token can be used for reputation review.

The blockchain-based trust engine according to an embodiment uses a technique of recording and storing distributed reliability information in a blockchain to increase the reliability of Internet information transactions. As a result, autonomous direct transactions without platform operators are possible. In addition, it is possible to prevent fraudulent transactions in the Internet space and provide autonomous direct transaction services with little relay fees. In particular, it provides reliability information that can determine objective reliability of a product or service provider for direct transactions.

The blockchain-based trust engine provides a trust information service that can go from a cryptocurrency blockchain to a trust economy. In this case, blockchain technology, which is mostly focused on the financial / security sector, can be spread to various industries. For example, blockchain-based information trust engines can be applied to Internet services that require trust as well as financial transactions. The Internet service can be a sharing economy, used transactions, real estate transactions, and the like. For example, in the case of a sharing economy, freelancer reliability information may be provided, in the case of a used transaction, reliability information of a used trader, and in a real estate transaction, reliability information of an intermediary may be provided. At this time, the reliability should be objective and have stability and security.

In order to ensure objective, stability and security, the blockchain-based trust engine manages reliability information based on the blockchain, and provides the trust engine API by independently specializing the detailed functions of the trust engine. At this time, the reliability information is safely stored on the blockchain and the reliability information is managed by a smart contract. Smart contracts are a means to digitally execute contract details. Automated execution of contracts without third-party intervention, tracking and reversal is not possible.

It can be easily applied to various industries through a flexible open platform, away from the use of existing cryptocurrency-oriented blockchain. Existing blockchain-applied application service platforms were mostly closed blockchain systems applicable only to specific fields. However, the blockchain-based trust engine according to an embodiment can easily develop a private platform service and quickly utilize the market by independently applying the detailed functions of the trust engine and applying an application programming interface (API) for each application field. Blockchain-based information trust engine securely stores and provides verified product profile information and trust information for people, and enables fair operation by smart contracts.

The blockchain-based information trust engine can be operated based on the open-source private blockchain network. At this time, it not only provides various functions, but also provides differentiation in terms of performance to easily apply to the actual market and increase product competitiveness. For example, we strengthen the security of the authorized community through multi-key access control management. Execute free and safe smart contracts between stakeholders for fair trade, and provide non-falsifiable reliability information of products and trade targets. Furthermore, it provides transparent transaction monitoring and blockchain community governance, and can reduce the cost of security solutions due to infrastructure-level hacking prevention and secure price competitiveness compared to existing platform operators. Hereinafter, the blockchain-based information trust engine having the above-mentioned features will be described in detail with reference to the drawings described below.

2 is a diagram showing the configuration of a blockchain-based information trust engine system according to an embodiment of the present invention.

Referring to FIG. 2, the blockchain-based information trust engine system 1 includes a user application 10, a decentralized app server (DApp server, hereinafter referred to as a 'DApp server') 12 and a blockchain network. (14), and may further include an off-chain DB (16).

The user application 10 is located at the user end, and may be a decentralized application that can implement a blockchain-based service through a smart contract. The user application 10 according to an embodiment includes a web user application 10-1, a mobile user application 10-2, and an information wallet 10-3.

The information wallet 10-3 manages user keys. At this time, keys for evaluation, keys for reputation, and keys for tokens (multi-key) are all managed separately. Accordingly, information access is different for each evaluation, reputation, and token, so it is possible to securely access and exchange information.

Blockchain network 14 is composed of a number of blockchain nodes. Blockchain-based information trust where each blockchain node stores information or trust information about people on the blockchain while providing information or human trust based on the blockchain and sharing and trading information based on trust through trust management The service is provided to the user application 10. Each blockchain node may be equipped with a blockchain-based information trust engine described above with reference to FIG. 1.

Blockchain nodes in the blockchain network execute smart contracts through channels to share information.The channel consists of multi-channels, including channels for evaluation, channels for reputation, and channels for tokens. , Each channel is separated. For example, blockchain nodes 1-3 (140-1,140-2,140-3) are evaluation smart contract nodes that execute evaluation smart contracts through an evaluation channel to store and share evaluation information. Blockchain nodes 3-5 (140-3,140-4,140-5) are reputation smart contract nodes that execute reputation smart contracts through reputation channels to store and share reputation information. Blockchain nodes 5-7 (140-5, 140-6, 140-7) are token smart contract nodes that store and share token information by executing token smart contracts through token channels. Through the information wallet 10-3, keys are separately used for each information of reliability information, and channels for information sharing are also used for each information.

According to an embodiment, prior to the evaluation, reputation, or token smart contract node execution of the evaluation, reputation, or token smart contract, the first step: the user access control step, and the second: the access control step for each information are preceded. For example, the access control smart contract node primarily checks the user's access authority through the access control smart contract. Then, when the user access right is confirmed, the access to the information is verified by verifying the validity of the evaluation information, reputation information, or token information for each evaluation, reputation, or token smart contract node. When the access right to information is confirmed, evaluation, reputation, or token smart contract is executed. In access control of information, security can be increased by allowing accessibility to be verified through multi-signatures, which require the signing of multiple approvers.

The dAPP server 12 relays between the user application 10 and the blockchain network 14. At this time, the rights of nodes participating in the blockchain network 14 are managed, and the channels for evaluation, channels for reputation, and channels for tokens are managed separately, and information is shared between blockchain nodes only through the same channel. Do it.

The blockchain platform according to an embodiment is operated on the basis of a private block-chain. Private blockchain is accessible only to authorized members and can access the blockchain.It uses a consensus algorithm such as the PBFT algorithm for consensus, so the transaction settlement time is relatively short and the processing performance is relatively high. . It is possible to authenticate members, encrypt information, and control access. At this time, the consensus is a method in which the blockchain participating nodes create a shared ledger block and store the block if the consensus succeeds after validation.

The off-chain DB 16 is a DB located outside the blockchain network 14, and in the off-chain, it is better to store information outside the chain (for example, profile information) or large data because of privacy. do.

3 is a diagram illustrating an example of sharing information between blockchain nodes based on a channel according to an embodiment of the present invention.

Referring to FIG. 3, the blockchain network is composed of a plurality of organizations (eg, org1, org2 in FIG. 3) and a consensus leader node, and each organization is composed of peer nodes and CAs. The consensus leader node ensures the consistency of the blockchain and delivers guaranteed transactions to peer nodes on the network. The consensus leader node also serves to authenticate the identities and roles of members in the supply chain. The Certificate Authority (CA) authenticates the user requesting the transaction.

Peer nodes in each organization execute smart contracts, control access to ledger data, and ensure transactions. At this time, the peer nodes are an access control smart contract node that controls access, an evaluation smart contract node that uses an evaluation channel to perform an evaluation transaction, a reputation smart contract node that uses a reputation channel to perform a reputation calculation transaction and a reputation inquiry transaction, And a token smart contract node that uses a token channel to perform a token issuance transaction. Channels are separated for each information to ensure information security and stability as information is shared.

4 is a diagram showing the configuration of a blockchain node according to an embodiment of the present invention.

2 and 4, the blockchain node 140 includes a smart contract interface 150, a blockchain engine 160, and a storage unit 170.

The smart contract interface 150 performs evaluation information storage and inquiry for an evaluation transaction, reputation calculation, evaluation information storage and inquiry for a reputation transaction, and new token information storage and inquiry for a token transaction.

The blockchain engine 160 according to an embodiment includes an access control unit 161, a smart contract control unit 162, a transaction control unit 163, a block generation unit 164, and a consensus control unit 165. Each of the above-described components can perform its function in different blockchain nodes according to the transaction flow. For example, the access control unit 161 is an access control smart contract node, and the smart contract control unit 162 and the transaction control unit 163 are evaluated by each information type in a smart contract node, a reputation smart contract node, or a token smart contract node. The generation unit 164 may perform the function at the block generation node and the consensus control unit 165 at the block consensus node.

The access control unit 161 controls user access to the evaluation, reputation, or token smart contract through the access control smart contract. The access control unit 161 according to an embodiment executes the access control smart contract to check the user access authority, and only the user whose access permission is confirmed calls the smart contract interface to the smart contract control unit 162.

For example, in the access control operation, the access control unit 161 generates a one-time shared secret for the evaluation session and transmits the one-time shared secret to the evaluator. In addition, when the evaluation content signature and the one-time shared secret are received from the evaluator, the verifier verifies that the one-time shared secret is correct, and the evaluator's public key is inquired from the blockchain to verify the signature with the inquired public key. When the evaluator verification is performed, the evaluation smart contract interface is called to the smart contract control unit 162. The evaluation access control process will be described later with reference to FIG. 12.

As another example, the access control unit 161, in the operation of the reputation access control, receives an access control smart contract interface from the dAPP server 12 according to a user request and checks whether it is possible to view the reputation in the blockchain through the access control smart contract interface. . Then, it is determined whether or not access is possible through multi-signature, and if access is authorized, a smart contract interface is called to the smart contract control unit 162. The reputation access control process will be described later with reference to FIG. 13.

The smart contract control unit 162 manages and executes smart contracts for each evaluation, reputation, and token, respectively. The transaction control unit 163 performs evaluation and reputation or token transactions through each smart contract executed by the smart contract control unit 162 and manages them. For example, an evaluation calculation transaction is performed through an evaluation smart contract, a reputation calculation transaction or reputation inquiry transaction is performed through a reputation smart contract, and a token issuance transaction is performed through a token smart contract. The transaction control unit 163 according to an embodiment performs an evaluation calculation through an evaluation calculation transaction and issues a token through a token issuance transaction as a reward for performing the evaluation, and uses the issued token to establish a reputation through a reputation inquiry transaction. Inquire.

The block generation unit 164 collects the final output of the smart contract from the transaction control unit 163 to generate a block. At this time, a new block in which newly generated transaction information is recorded for a specific period is generated. The final output of the smart contract may be <smart contract function signature, result value>. The result is <readset, writeset>. Here, readset is the <key, value> input value before transaction processing, and writeset is the <key, value> output value after transaction processing. The consensus control unit 165 agrees the block according to the block consensus request of the block generation unit 164. Then, the block is delivered to all participating nodes and the transaction result is delivered to the dAPP server 12.

The block generation of the block generation unit 164 and the block agreement of the consultation control unit 165 may be different according to a given consensus method. For example, in the case of a DPoS (Delegated Proof of Stake) method, a block generation node is selected by the token quantity. In the case of a PBFT (Practical Byzantine Fault Tolerance) method, a block generation node is selected using a leader selection algorithm. If the node that created the block becomes a client and requests consensus for the entire block, not the transaction number, the leader node confirms the block (block height, block contents (smart contract final output collection)) and delivers it to another node, pre After verifying <readset, writeset> through the steps of -prepare, prepare, and commit, the node connects to its own blockchain and records it in the on-chain DB 171.

The storage unit 170 according to an embodiment includes an on-chain DB 171, a block storage unit 172, and a smart contract storage unit 173.

The on-chain DB 171 stores reliability information that is replicated and shared between blockchain nodes sharing the same channel. The block storage unit 172 stores blocks generated according to the execution of a transaction flow. The smart contract storage unit 173 stores a smart contract for performing a transaction flow.

Depending on the type of transaction flow, information stored in the on-chain DB 171 may be as follows. For example, in the case of an evaluation transaction flow, information on <evaluator ID, evaluator ID, evaluator-profile-hash value, community ID, evaluation score, and current time> is stored in the on-chain DB 171. In the case of a reputation calculation transaction flow, the <user ID, community ID, reputation score, and current time> information is stored in the on-chain DB 171. In the case of a token-issuing transaction flow, on-chain DB 171 stores transaction information that has not been consumed among token transaction records recorded on the blockchain. As another example, in order to ensure the anonymity of the reliability information, when storing the evaluation information, reputation information, and token information in the on-chain DB 171 of the blockchain, hashing the public key instead of the ID. Only public key hash values can be stored.

5 is a diagram illustrating a data flow consisting of an evaluation-token issuance-reputation inquiry transaction according to an embodiment of the present invention.

Referring to FIG. 5, the evaluation smart contract node performs evaluation by performing the evaluation transaction 500. The token smart contract node issues a token issuance transaction 510 as a reward for performing evaluation to issue a token (520). The reputation smart contract node retrieves reputation by performing a reputation inquiry transaction using the issued token (530).

6 is a diagram illustrating a flow of a method for managing trust information based on a blockchain according to an embodiment of the present invention.

Referring to FIG. 6, the blockchain node calculates reliability information (600). Reliability information includes predetermined information or evaluation information for a person, reputation information, token information, and the like. The information or the person may be an object for evaluating reliability, an object for measuring reputation based on evaluation, and an object for viewing reputation. Information can be a product, a service, or the like.

The evaluation smart contract node according to an embodiment calculates an evaluation score for the evaluator in the reliability information calculation step 600. At this time, the evaluation smart contract node may calculate an evaluation score for the evaluator by combining at least one of <evaluator evaluation value, satisfaction of customer u contracted with the evaluator, customer reliability, and service importance of the evaluator>. For example, the evaluation score is e (f, i) = E _i × S _i × C _i × V _i . Here, e (f, i) is the evaluation score for the i-th service of the evaluator f, E _i is the evaluation value of at least one evaluator, S _i is the satisfaction of at least one customer contracted with the evaluator f , C _i is the reliability of at least one customer, and V _i is the service importance of the evaluator. To illustrate the subject for the sake of understanding, the evaluator is a freelancer, the service is the lecturer's lecture, the evaluator is the evaluation committee, and the customer u is a student taking a lecture. In the evaluation committee composed of multiple evaluators, the evaluator's evaluation value E _i may be an evaluator's evaluation average value (eg, a trimmed mean). When the number of customers u is large, the customer satisfaction S _i may be an average value of satisfaction of a plurality of customers (eg, trimmed mean). The service importance (V _i ) of the evaluator may be calculated based on the amount of money in the case of a transaction, and in the case of other matters based on the importance of the work.

The reputation smart contract node according to an embodiment calculates the reputation score for the evaluator based on the evaluation score calculated through the evaluation smart contract node in the reliability information calculation step 600. For example, the reputation score is calculated by combining at least one of the <evaluation result value for the evaluator in the first period, the evaluation result value for the evaluator in the second period, and the evaluator's profile evaluation result value>. The first period is recent, and the second period is past. For example, within one year from the time of reputation calculation, it is recent, and if one year has elapsed, it is the past.

The plate score according to an embodiment is r (f) = α × (∑evaluation (f) / N) + β × r '(f) + γ × profile (f). Here, r (f) is the reputation score for the evaluator (f), (∑evaluation (f) / N) is the evaluation result value for the recent evaluator f, and r '(f) is the past evaluator f. Is the evaluation result value, and profile (f) is the evaluation result value of the evaluator f. α, β, and γ are weights, and α + β + γ = 1. For example, the weight of the recent evaluation result value is 0.6 and the weight of the past evaluation result value is 0.4. When the community activity of the evaluator f is the first time, the weights α, β are 0, and γ is 1. This is because there is no experience in community activities.

The reputation smart contract node according to an embodiment calculates reliability prediction information in the reliability information calculation step 600. Reliability prediction information is information that predicts trust in the future evaluator based on the evaluator's threshold (trustor) in consideration of time (time_frame). For example, the reliability prediction information includes <reputation score of the evaluator, reference value set by the evaluator, time>. If this is expressed as an expression, t (trustor, trustee, community) = f (r (trustee), threshold (trustor), time_frame). The threshold value set by the evaluator (threshold (trustor)) is a value set by the evaluator, for example, if it exceeds 0.5, it is set as a good reputation.

The reputation smart contract node according to an embodiment calculates reputation power of the group under test in the reliability information calculation step 600. The reputation power of the group under evaluation refers to the reputation of the evaluators belonging to the group, and the reputation power may be calculated by reflecting the reputation and fidelity of the evaluators belonging to the group. For example, gt (fg) = f (sum (reputation (freelancer in group) × fidelity (trustee in group)) gt (fg) is the reputation power of the evaluator group, f (sum (reputation (freelancer in group) Is the sum of the reputations of the members of the group, and fidelity (trustee in group) is fidelity, which can be calculated based on the participation rate.

Subsequently, the blockchain node distributes and stores the calculated reliability information in the blockchain (610), and manages the reliability information stored in the blockchain by a smart contract (620).

Furthermore, blockchain nodes can share reliability information with other blockchain nodes. For example, share evaluation information between blockchain nodes connected through an evaluation channel, share reputation information between blockchain nodes connected through a reputation channel, and share token information between blockchain nodes connected through a token channel. At this time, the evaluation channel, reputation channel, and token channel are operated separately.

7 is a diagram illustrating an evaluation transaction flow according to an embodiment of the present invention.

Referring to FIG. 7, an evaluation is performed as the user application 10 generates an evaluation transaction and transmits it to the DApp server 12 by a trustor who wants to evaluate the trustee (700). When the DApp server 12 receives the evaluation transaction, it requests the user profile information from the off-chain DB 16 (702) and acquires it (704). Then, the DApp server 12 calls the access control smart contract to the access control smart contract node 70 (706). The access control smart contract node 70 may be randomly selected. To this end, the DApp server 12 obtains a list of working access control smart contract nodes and selects any access control smart contract node therefrom.

According to the access control smart contract call of the DApp server 12, the access control smart contract node 70 verifies the user access right by verifying the user by executing the access control smart contract (708). In accordance with an embodiment, the access control smart contract node 70 generates a one-time shared password for the evaluation session in the user access right confirmation step 708 and transmits the one-time shared password to the evaluator. When the evaluation contents signature and the one-time shared secret are received from the evaluator, the verifier verifies that the one-time shared secret is correct, and the evaluator's public key is inquired on the blockchain and the signed public key is verified to verify the evaluator. The access control smart contract node 70 calls the evaluation smart contract to the evaluation smart contract node 72 only for the user whose access permission is confirmed (710).

According to the evaluation smart contract call of the access control smart contract node 70, the evaluation smart contract node 72 verifies the validity of the evaluation information and checks the information access right (712). As an example of validating the evaluation information, there is a method in which the evaluation smart contract node 72 compares the user profile hash value obtained from the off-chain DB 16 by the DApp server 12 to check forgery of the document. When the access right to the evaluation information is confirmed, the evaluation smart contract node 72 executes the evaluation smart contract and processes the evaluation transaction for calculating the evaluation score. Then, the final output of the evaluation smart contract according to the processing result is transmitted to the block generating node 74 (714). The evaluation score may be calculated by combining at least one of <evaluator evaluation value, customer satisfaction contracted with the evaluator, customer reliability, and service importance of the evaluator>. The final output of the evaluation smart contract consists of <smart contract function signature, result value>, and the result value consists of <readset, writeset>. readset is the <key, value> input value before transaction processing, and wirteset is the <key, value> output value after transaction processing.

According to the evaluation transaction processing of the evaluation smart contract node 72, the block generation node 74 collects smart contract final outputs from the evaluation smart contract node 72 to generate (716) a block including the smart contract final outputs. , Broadcast the generated block to at least one block agreement node 76 to request a block agreement (718).

According to the block consensus request of the block generation node 74, after each block consensus node 76 consensus 720 through block verification, the verification result is generated by the DApp server 12 and the evaluation smart contract node 72 and block generation It transmits (722) to the node (74), further connects (724) the block to its own blockchain, and stores the evaluation information in the on-chain DB (726). If the agreement result is successful, the evaluation smart contract node 72 and the block generation node 74 additionally connect 724 blocks to their respective blockchains and store the evaluation information in the on-chain DB (726).

The block agreement of the block agreement node 76 may be different according to a given consensus scheme. For example, in the case of the Delegated Proof of Stake (DPoS) method, the block generation node 74 is selected by the token quantity. In the case of a PBFT (Practical Byzantine Fault Tolerance) method, a block generation node 74 is selected by a leader selection algorithm. When the block generation node 74 becomes a client and requests consensus for the entire block, not the transaction number, the leader node (using a separate selection algorithm) confirms the block (block height, block contents (smart contract final output collection)) To the other node, verify the <readset, writeset> through pre-prepare, prepare, and commit steps, connect to the node's own blockchain, and record the evaluation results in the on-chain DB 171. The evaluation results may be made of <evaluator ID, evaluator ID, evaluator-profile-hash value, community ID, evaluation score, evaluation time>. As another example, in order to ensure the anonymity of the reliability information, when storing the evaluation information in the on-chain DB 171 of the blockchain, only the public key hash value that hashing the public key instead of the ID can be stored. have.

8 is a diagram illustrating a reputation calculation transaction flow according to an embodiment of the present invention.

Referring to FIG. 8, the DApp server 12 calls the access control smart contract to the access control smart contract node 70 (800). The access control smart contract node 70 executes the access control smart contract to verify the user's access rights as the user is verified (802), and only the user whose access permission has been verified has a reputation smart contract with the reputation smart contract node 78. Call (804).

According to the reputation smart contract call, the reputation smart contract node 78 executes the reputation smart contract to process a reputation transaction that calculates a reputation score for the evaluator (806). The reputation score may be calculated by combining at least one of the <evaluation result value for the recent evaluator, the past evaluation result value, and the evaluator profile evaluation result value>. At this time, a weight α may be assigned to an evaluation result value for the recent evaluator, a weight β may be assigned to an evaluation result value for the past evaluator, and a weight γ may be assigned to the evaluator's profile evaluation result value. α + β + γ = 1, and when the evaluator's community activity is the first time, the weight γ of the evaluator's profile evaluation result value is 1.

Furthermore, the reputation smart contract node 78 can calculate reliability prediction information. Reliability prediction information is information that predicts trust in the future evaluator based on the evaluator's threshold (trustor) in consideration of time (time_frame). For example, the reliability prediction information includes <reputation score of the evaluator, reference value set by the evaluator, time>. If this is expressed as an expression, t (trustor, trustee, community) = f (r (trustee), threshold (trustor), time_frame). The threshold value set by the evaluator (threshold (trustor)) is a value set by the evaluator, for example, if it exceeds 0.5, it is set as a good reputation.

Furthermore, the reputation smart contract node 78 may calculate reputation power of the group to which the evaluator belongs. For example, gt (fg) = f (sum (reputation (freelancer in group) × fidelity (trustee in group)) gt (fg) is the reputation power of the evaluator group, f (sum (reputation (freelancer in group) Is the sum of the reputations of the members of the group, and fidelity (trustee in group) is fidelity, which can be calculated based on the participation rate.

Subsequently, the reputation smart contract node 78 executes the reputation smart contract to process the reputation transaction and transmits the final output of the reputation smart contract to the block generation node 74 (808). The final output of the reputation smart contract consists of <smart contract function signature, result value>, and the result value consists of <readset, writeset>. readset is the <key, value> input value before transaction processing, and wirteset is the <key, value> output value after transaction processing.

According to the reputation transaction processing of the reputation smart contract node 78, the block generation node 74 collects smart contract final outputs from the reputation smart contract node 78 to generate a block containing the smart contract final outputs (810). , Broadcast the generated block to at least one block agreement node 76 to request a block agreement (812).

According to the block consensus request of the block generation node 74, each block consensus node 76 agrees (814) through block verification, and then transmits the verification result to the reputation smart contract node 78 and the block generation node 74 (816), the block is additionally connected to its own blockchain (818) and the reputation information is stored in the on-chain DB (820). If the agreement result is successful, the reputation smart contract node 78 and the block generation node 74 additionally connect 818 blocks to their respective blockchains and store reputation information in the on-chain DB (820). Reputation information stored in the on-chain DB may consist of <evaluator ID, evaluator ID, community ID, reputation score, reputation time>. As another example, in order to ensure the anonymity of the reliability information, when storing the reputation information in the on-chain DB 171 of the blockchain, only the public key hash value that hashing the public key instead of the ID can be stored. have.

9 is a diagram illustrating a reputation inquiry transaction flow according to an embodiment of the present invention.

Referring to FIG. 9, the user application 10 generates a reputation transaction by the reputation queryer who wants to query the reputation of the evaluator, and requests the reputation of the DApp server 12 (900). The DApp server 12 receives a reputation transaction from the user application 10 and calls the access control smart contract to the access control smart contract node 70 (902). The access control smart contract node 70 executes the access control smart contract to verify the user access right as the reputation query is verified. For example, the access control smart contract node 70 checks the access level by checking the user level of the reputation queryer (904), and when access control is confirmed, the multi-signature verification and evaluator of multiple reputation managers It is determined whether or not the inquiry is possible through the multi-signature verification of the reputation queryer (906). The user rating may be (evaluator group, evaluator group, information buyer group). Multi-signature verification For example, the processes of the first step: the approver (two out of three reputation managers) and the second step: (the evaluator, the reputation requester) are simultaneously verified (multi-signature).

The access control smart contract node 70 calls the reputation smart contract to the reputation smart contract node 78 only for the user whose access permission is confirmed (908). Then, the reputation smart contract node 78 inquires 910 the reputation information stored in the on-chain DB and transmits the retrieved reputation information to the user application 10 through the DApp server 12 (912, 914). Blockchain information inquiry is not recorded on the blockchain, so there is no need for the process of block creation and consensus.

10 is a diagram illustrating a token issuing transaction flow according to an embodiment of the present invention.

Referring to FIG. 10, a token issuance request is requested as the user application 10 generates a token issuance transaction by the user and transmits it to the DApp server 12 (1000). The DApp server 12 calls the access control smart contract to the access control smart contract node 70 (1002). The access control smart contract node 70 may be randomly selected. To this end, the DApp server 12 obtains a list of working access control smart contract nodes and selects any access control smart contract node therefrom.

According to the access control smart contract call of the DApp server 12, the access control smart contract node 70 executes the access control smart contract to check whether the user is a token issuer (1004). If the user is confirmed to be a token issuer, the token smart contract is called to the token smart contract node 79 (1006).

Upon the token smart contract call of the access control smart contract node 70, the token smart contract node 79 executes the token smart contract to generate a new token (for example, UTXO) as it processes the token issuing transaction ( 1008). Subsequently, the token smart contract node 79 transmits the final output of the token smart contract to the block generation node 74 (1010). The final output of the token smart contract consists of <smart contract function signature, result value>, and the result value consists of <readset, writeset>. readset is the <key, value> input value before transaction processing, and wirteset is the <key, value> output value after transaction processing.

According to the token issuance transaction processing of the token smart contract node 79, the block generation node 74 collects smart contract final outputs from the token smart contract node 79 to generate a block including the smart contract final outputs (1012). Then, the generated block is broadcast to at least one block agreement node 76 to request a block agreement (1014).

According to the block consensus request of the block generation node 74, after each block consensus node 76 consensus 1016 through block verification, the verification result is generated by the DApp server 12 and the token smart contract node 79 and block generation It transmits (1018) to the node (74), additionally connects (1020) blocks to its own blockchain, and stores token information (UTXO) in the on-chain DB (726). If the consensus result is successful, the evaluation smart contract node 72 and the block generation node 74 additionally connect 724 blocks to their respective blockchains and store token information (e.g., UTXO) in the on-chain DB. (1022).

11 is a diagram showing the configuration of an information wallet according to an embodiment of the present invention.

Referring to FIG. 11, the information wallet 10-3 includes an app 100, a connection control unit 102, an account storage control unit 104, and a UTXO storage control unit 106. The app 100 transmits control commands to the connection control unit 102, the account storage control unit 104, and the UTXO storage control unit 106. The account storage control unit 104 stores the key value in the key DB 108, and the UTXO storage control unit 106 stores UTXO (Unspent Transaction Output) information in the UTXO storage unit 109. The key value may include a key pair (public key, private key) for each purpose such as token, evaluation, and reputation. UTXO information means transaction information that has not yet been consumed among token transaction records recorded on the blockchain, and may be replaced with other information that performs the same function.

12 is a diagram illustrating an evaluation access control process according to an embodiment of the present invention.

7 and 12, the evaluation manager creates a new evaluation session and selects an evaluator (1200). The evaluator may be a member selected by the evaluation manager as an evaluation member. The access control smart contract node 70 generates a one-time shared secret for the evaluation session (1202) and transmits a one-time shared secret to the evaluators (1204). The one-time shared secret may be randomly generated for each evaluation session, and is destroyed after the evaluation session ends. The evaluator signs the evaluation contents with the evaluation private key (1206), and transmits the evaluation contents signature and the one-time shared secret to the access control smart contract node 70 (1208). The access control smart contract node 70 verifies the one-time shared secret and verifies the signature with the evaluator's public key (1210). The evaluator's public key can be retrieved from the user membership blockchain.

13 is a diagram illustrating a reputation access control process according to an embodiment of the present invention.

9 and 13, a reputation queryer who wants to query a reputation of a specific evaluator requests a reputation inquiry of a specific evaluator through the user application 10 (1300). Then, the dAPP server 12 calls the access control smart contract to the access control smart contract node 70 (1302). The access control smart contract node 70 checks whether access is controlled using the user class (1304), and verifies whether it is possible to search through multi-signature (1306). The user rating may be (evaluator group, evaluator group, information buyer group). When access control is confirmed (1304), whether or not it is possible to check through multi-signature (1306), for example, Step 1: Approver (two of three reputation managers), Step 2: (The evaluator and the requester of reputation) go through the process of simultaneously verifying the signature (multi-signature).

14 is a diagram illustrating a token access control process according to an embodiment of the present invention.

10 and 14, a user who wants to access a token signs a new token (UTXO) with a token private key through the user application 10 (1400). Then, the dAPP server 12 transmits the transaction signed with the token (UTXO) and the private key to the access control smart contract node 70 (1402). The access control smart contract node 70 inquires (1404) the token public key of the user in the user membership blockchain and verifies the token (UTXO) signature with the user public key (1406). When the signature is verified, the access control smart contract node 70 calls the token smart contract to the token smart contract node 79 to execute the token smart contract (1408).

15 is a diagram illustrating a membership management service according to an embodiment of the present invention.

15, membership includes information membership 1500, user membership 1510, and node membership 1520. Information membership is managed by information, including token membership 1502, evaluation membership 1504, and reputation membership 1506. The user membership 1510 registers a user account (id / password) and maps the public key from the key pair (public key, private key) generated in the information wallet to the user account to block the user membership Store it in the chain (id, public key, password). When a user signs with a private key and requests a certificate, a signed certificate is issued. When a user requests a transaction including user object information (private key, certificate (id, public key)), the user membership blockchain checks the user membership and signature, and if not registered, rejects the transaction and passes if registered. In the future, in order to ensure the anonymity of the reliability information, when storing the reliability information (evaluation, reputation, token) information in the blockchain, the public key is hashed and stored instead of the evaluator's ID. User membership blockchain can be managed in on-chain DB for DB stability. The node membership 1520 may be managed independently of the other two memberships 1500 and 1510.

16 is a diagram illustrating a reliability information measurement scenario according to an embodiment of the present invention.

Referring to FIG. 16, the blockchain node calculates an evaluation score for the evaluator f using the formula e (f, i) = E _i × S _i × C _i × V _i . Here, e (f, i) (Evaluation) 1606 is the evaluation score for the i-th service of the evaluator f, E _i (Committee) 1610 is the evaluator's evaluation value, S _i (Satisfaction) (1612) ) Is the satisfaction of at least one customer contracted with the evaluator f, C _i (Credence) 1614 is the reliability of the customer, and V _i (Value) 1616 is the service importance of the evaluator f. Referring to FIG. 16, when the evaluation value of each evaluator is E1 to E5 (1620-1 to 1620-5) for the freelancer 1600 that is the evaluator, E _i (Committee) 1610 Is the average of E1 to E5 (1620-1 to 1620-5). The customer reliability C _i (Credence) 1614 and the service importance (V _i ) (Value) 1616 of the evaluator f were arbitrarily set to 1.

e (f, i) (Evaluation) 1606 represents E _i (Committee) 1610, S _i (Satisfaction) 1612, C _i (Credence) 1614 and V _i (Value) 1616 respectively This is the multiplication operation (e (f, i) = E _i × S _i × C _i × V _i ). e (f, i) (Evaluation) 1606 is calculated for each freelance (Work) 1608 of the freelance (1600).

Reputation 1604 for freelance 1600 is a value obtained by averaging e (f, i) (Evaluation) 1606 for each work 1608. The Trust Criteria 1602 for the Freelance 1600 is a value obtained by adding different weights to the recent career reputation and the past career reputation 1604. For example, in the case of freelancer jhlee, a weight of 0.6 is assigned to a reputation score of 2018 (0.49 (1604)), and a weight of 0.4 is assigned to a reputation score of 0.51 (1604) in 2017. Trust Criteria) 1602 is 0.50.

The reputation power of the evaluator group (BeerGraph) 1622 is calculated by reflecting the reputation and fidelity of the evaluators belonging to the same group. For example, if the freelancers jhlee and jwlee are in the same group, and the fidelity of jhlee is 0.2 and the fidelity of jwlee is 0.1, the reputation power of the group under test (BeerGraph) 1622 is (0.50x0.2) + (0.37x0.1) ) = 0.14. Fidelity can be calculated based on the participation rate.

So far, the present invention has been focused on the embodiments. Those skilled in the art to which the present invention pertains will understand that the present invention can be implemented in a modified form without departing from the essential characteristics of the present invention. Therefore, the disclosed embodiments should be considered in terms of explanation, not limitation. The scope of the present invention is shown in the claims rather than the foregoing description, and all differences within the equivalent range should be interpreted as being included in the present invention.

Claims (22)

Calculating reliability information; And
Distributed recording and storing the calculated reliability information in the blockchain; And
Managing the reliability information stored in the blockchain by a smart contract; It includes,
The step of calculating the reliability information,
Calculating an evaluation score for the evaluator; And
Calculating a reputation score for the evaluator based on the calculated evaluation score;
Blockchain based reliability information management method comprising a. The method of claim 1, wherein calculating the evaluation score
Blockchain-based reliability information management characterized by calculating the evaluation score for the evaluator by combining at least one of <evaluator's evaluation value, customer satisfaction contracted with the evaluator, customer reliability, and service importance of the evaluator> Way. The evaluation score of claim 2,
e (f, i) = E _i × S _i × C _i × V _i ,
e (f, i) is the evaluation score for the i-th service of the evaluator f, E _i is the evaluation value of at least one evaluator, S _i is the satisfaction of at least one customer contracted with the evaluator f, C _i is the reliability of at least one customer, V _i is a blockchain-based reliability information management method, characterized in that the service importance of the evaluator f. The method of claim 1, wherein the step of calculating the reputation score
Based on the calculated evaluation score, a reputation score is obtained by combining at least one of the <evaluation result value for the evaluator within the first period, the evaluation result value for the evaluator within the second period, and the evaluator's profile evaluation result value>. Calculate,
The first period is more recent than the second period Blockchain-based reliability information management method. The reputation score of claim 4,
r (f) = α × (∑evaluation (f) / N) + β × r '(f) + γ × profile (f),
r (f) is the reputation score for the subject f,
∑evaluation (f) / N is the evaluation result value for evaluator f within the first period,
r '(f) is the evaluation result value for the subject f in the second period,
profile (f) is the value of the evaluation result of the evaluator f,
Blockchain-based reliability information management method, characterized in that α, β, and γ are weights, and α + β + γ = 1. The method of claim 5,
Blockchain-based reliability information management method characterized in that the weight of the profile (f) is 1 when the community activity of the evaluator f is the first time. The method of claim 1, wherein calculating the reliability information
Calculating reliability prediction information predicting confidence in the future evaluator as a reference value of the evaluator in consideration of time; Further comprising,
The reliability prediction information includes a <reputation score of the evaluator, a reference value set by the evaluator, and time>. The method of claim 1, wherein calculating the reliability information
Calculating the reputation power of the group to which the evaluator belongs; And
Reflecting the reputation and fidelity of the evaluator belonging to the group when calculating the reputation power;
Blockchain based reliability information management method further comprising a. The method of claim 1, wherein the blockchain-based reliability information management method is
Sharing reliability information with other blockchain nodes; Further comprising,
The step of sharing the reliability information
Sharing evaluation information between blockchain nodes connected through an evaluation channel;
Sharing reputation information between blockchain nodes connected through a reputation channel; And
Sharing token information between blockchain nodes connected through a token channel; It includes,
The evaluation channel, reputation channel and token channel are operated separately from each other. A user application generating and evaluating an evaluation transaction by the evaluator who wants to evaluate the evaluator;
A distributed app server receiving an evaluation transaction and calling the access control smart contract to the access control smart contract node;
Confirming a user access right as the access control smart contract node verifies the user by executing the access control smart contract;
An access control smart contract node calling the evaluation smart contract to the evaluation smart contract node only for the user for whom the access right has been confirmed, and the evaluation smart contract node verifies the validity of the evaluation information to check the information access right; And
An evaluation smart contract node processing an evaluation transaction for calculating an evaluation score for the evaluator by executing the evaluation smart contract when the access right to the evaluation information is confirmed;
Blockchain based reliability information management method comprising a. The method of claim 10, wherein the step of confirming the user access right is
Generating a one-time shared secret for the evaluation session and transmitting the one-time shared secret to the evaluator;
Receiving an evaluation content signature and a one-time shared password from the evaluator, verifying that the one-time shared secret is correct, inquiring the evaluator's public key on the blockchain, and verifying the evaluator by verifying the signature with the viewed public key; And
When the evaluator is verified, calling the evaluation smart contract interface;
Blockchain based reliability information management method comprising a. The method of claim 10, wherein the step of confirming the right to access the information is
A method of managing trust information based on a blockchain, wherein the evaluation smart contract node compares a user profile hash value obtained from an off-chain DB by a distributed app server and checks forgery of documents. The method of claim 10, wherein the step of processing an evaluation transaction for calculating an evaluation score is
A blockchain-based reliability information management method characterized by calculating an evaluation score by combining at least one of <evaluator evaluation value, customer satisfaction contracted with the evaluator, customer reliability, and service importance of the evaluator>. The method of claim 10, wherein the blockchain-based reliability information management method is
According to the evaluation transaction processing of the evaluation smart contract node, the block generation node collects the smart contract final outputs from the evaluation smart contract node to generate a block, and broadcasts the generated block to at least one block consensus node to request block consensus step; And
After each block agreement node verifies the block according to the block agreement request of the block creation node, transmits a verification result, additionally connects a block to its own blockchain, and stores evaluation information in an on-chain DB;
Blockchain based reliability information management method further comprising a. A distributed app server calling the access control smart contract to the access control smart contract node;
Confirming a user access right as the access control smart contract node verifies the user by executing the access control smart contract;
The access control smart contract node calling the reputation smart contract to the reputation smart contract node only for the user whose access authority is confirmed; And
A reputation smart contract node executing a reputation smart contract to process a reputation transaction for calculating a reputation score for the evaluator;
Blockchain based reliability information management method comprising a. 16. The method of claim 15, wherein the step of processing a reputation transaction for calculating a reputation score is
The reputation score is calculated by combining at least one of the <evaluation result value for the evaluator within the first period, the evaluation result value for the evaluator within the second period, and the evaluator's profile evaluation result value>,
Blockchain-based reliability information management method characterized in that the first period is more recent than the second period based on the reputation calculation time. 17. The method of claim 16, wherein the step of processing a reputation transaction for calculating a reputation score is
The weight α is assigned to the evaluation result value for the evaluator within the first period,
The weight β is assigned to the evaluation result value for the evaluator within the second period,
The weight γ is assigned to the evaluator's profile evaluation result value,
Blockchain-based reliability information management method, characterized in that α + β + γ = 1, and when the evaluator's community activity is the first time, the weight of the evaluator's profile evaluation result value is 1. The method of claim 15, wherein the blockchain-based reliability information management method is
Calculating reliability prediction information predicting confidence in the future evaluator as a reference value of the evaluator in consideration of time; Further comprising,
The reliability prediction information includes a <reputation score of the evaluator, a reference value set by the evaluator, and time>. The method of claim 15, wherein the blockchain-based reliability information management method is
Calculating the reputation power of the group to which the evaluator belongs; And
Reflecting the reputation and fidelity of the evaluator belonging to the group when calculating the reputation power;
Blockchain based reliability information management method further comprising a. The method of claim 15, wherein the blockchain-based reliability information management method is
A block generating node collecting the smart contract final outputs from the reputable smart contract node to generate a block and broadcasting the generated block to at least one block consensus node to request block consensus; And
After each block agreement node verifies the block according to the block agreement request of the block generation node, transmits a verification result, additionally connects the block to its own blockchain, and stores reputation information in the on-chain DB;
Blockchain based reliability information management method further comprising a. The method of claim 15, wherein the blockchain-based reliability information management method is
Requesting a reputation inquiry by a user application generating a reputation transaction by a reputation queryer who wishes to query the reputation of the evaluator;
A distributed app server receiving a reputation transaction and calling the access control smart contract to the access control smart contract node;
Confirming a user access right as the access control smart contract node verifies the user by executing the access control smart contract;
The access control smart contract node calling the reputation smart contract to the reputation smart contract node only for the user whose access authority is confirmed; And
A step of retrieving the pre-stored reputation information by the reputation smart contract node and transmitting the retrieved reputation information to a user application through a distributed app server;
Blockchain based reliability information management method further comprising a. The method of claim 21, wherein the step of confirming the user access right
Confirming access control by checking a user level of the reputation searcher; And
Determining whether access is possible by checking multi-signatures of a plurality of reputation managers and checking multi-signatures of the evaluator and the reputation searcher when access control is confirmed;
Blockchain based reliability information management method comprising a.

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