KR102009160B1 - Information trust engine system based on block-chain - Google Patents

Abstract

A blockchain-based information trust engine system is disclosed. According to an embodiment of the present invention, the blockchain-based information trust engine system comprises: a user application; a blockchain network composed of blockchain nodes which provide a blockchain-based information trust service that shares and trades reliability information while maintaining and managing information or human reliability information on the blockchain; and a decentralized application server which relays between the user application and the blockchain network. The reliability information may include information or human evaluation information, reputation information, and token information.

Description

Information trust engine system based on block-chain}

The present invention relates to blockchain technology.

Block-chain technology is the basis of cryptocurrency like 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 party can safely and effectively deliver the service (product) to me. Blockchain is a second Internet that can be exchanged for reliable value (assets), and is a new market-destructive 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 blockchain can be prevented at the infrastructure level. Existing Internet service issues 'One-way Trust', a trust of platform-centered service. For example, there is a possibility of personal information leakage and information forgery due to hacking of a central server, and a high relay fee and information manipulation possibility of platform operators. In addition, there is a serious gap in the quantity and quality of information held by each actor in the transaction, including platform operators, suppliers, and consumers (information asymmetry). Furthermore, the potential for surveillance and control of large platform operators is emerging. For example, there is a concern that big brothers such as Google and Facebook can take control of their personal information and use it commercially.

According to an embodiment, a blockchain-based information trust engine system that provides security and stability by providing reliability information on information or a person based on a blockchain is proposed.

The blockchain-based information trust engine system according to an embodiment of the present invention provides a blockchain-based information trust service for sharing and trading reliability information while maintaining and managing reliability information about a user application and information on a blockchain. It includes a blockchain network composed of chain nodes, and a distributed app server for relaying between a user application and a blockchain network. Here, the reliability information may include information or evaluation information about the person, reputation information and token information.

The blockchain node has multiple channels, including an evaluation channel, a reputation channel and a token channel, each channel being operated separately, sharing the evaluation information between the blockchain nodes connected through the evaluation channel, and between the blockchain nodes connected through the reputation channel. By sharing reputation information and sharing token information among blockchain nodes connected through a token channel, information between blockchain nodes can be shared through the same channel.

The blockchain node first checks the user's access authority through the access control smart contract, and if the user access authority is confirmed, the validity of the evaluation information, reputation information or token information for each evaluation, reputation or token smart contract is secondary. It verifies the access rights for each information by verifying the information. Once the information access rights are verified, evaluation, reputation or token smart contract can be executed.

The blockchain node includes an access control unit that controls user access to an evaluation, reputation or token smart contract through an access control smart contract, a smart contract control unit that manages and executes evaluation, reputation and token smart contracts respectively, and a smart contract. A transaction control unit that executes and manages an evaluation, reputation or token transaction through each smart contract executed by the control unit, a block generation unit which generates a block by collecting the final output of the smart contract from the transaction control unit, and a block agreement request of the block generation unit It may include a consensus control unit for agreeing the block according to.

The transaction controller may perform an evaluation by performing an evaluation transaction, perform a token issuance transaction as a reward for performing the evaluation, issue a token, and perform a reputation inquiry transaction using the issued token to inquire a reputation.

The access control unit, in the evaluation access control operation, generates a one-time shared password for the evaluation session and transmits the one-time shared password to the evaluator. Upon receiving the evaluation content signature and the one-time shared password from the evaluator, the access controller checks whether the one-time shared password is correct and evaluates the evaluator. The evaluator can be verified by checking the signature with the retrieved public key by querying the public key in the blockchain, and when the evaluator verification is performed, the evaluation smart contract interface can be called to the smart contract controller.

When the access control operation, the access control smart contract interface is called from the distributed app server according to the user's request, and the access control unit checks whether the reputation can be viewed on the blockchain through the access control smart contract interface, and multi-signs multiple users. It determines whether access is possible by checking whether it can be viewed through, and if the access is approved, the smart contract interface can be called to the smart contract controller.

The blockchain node includes an on-chain DB in which reliability information shared and shared between blockchain nodes sharing the same channel is stored, a block storage unit storing a block generated according to a transaction flow, and a smart for performing a transaction flow. It may include a smart contract storage that stores the contract.

The on-chain DB may store a public key hash value that hashes the public key instead of the user ID to ensure the anonymity of the trust information when storing the trust information.

The user application may include a web user application, a mobile user application, and an information wallet user application that separately stores and manages user keys for evaluation, reputation, and tokens.

The distributed app server manages the authority of the nodes participating in the blockchain network and manages separate channels into channels for evaluation, channels for reputation, and channels for tokens, so that the corresponding information between blockchain nodes through the same channel. Network management unit for sharing user information, an API unit for providing REST APIs to user applications upon request of user applications, and calling smart contract interfaces to blockchain nodes, and users who manage user membership through user key and access control management. The membership management unit may include a blockchain network common interface that provides a common interface for invoking smart contract interfaces to correspond to different blockchain network platforms.

The user membership management unit registers a user account (id / password) and maps the public key to the user account in a key pair (public key and private key) generated by the information wallet user application and stores it in the user membership blockchain. (id, public key, password), and when the user signs a private key to request a transaction, the user membership blockchain can verify the user's membership and signature, and if the user is unregistered, rejects the transaction and passes the registration.

The blockchain-based information trust engine system includes an on-chain DB that is located inside the blockchain, stores only hash values of personal data, and stores member information authorized to access the blockchain, and is located outside the blockchain. It may further include an off-chain DB for storing the required information.

According to the blockchain-based information trust engine system according to an embodiment, reliability information having objective, stability and security can be provided through the blockchain-based information trust engine.

The blockchain-based trust engine uses a technique for distributedly recording and storing reliability information on the blockchain to increase the reliability of internet information transactions. Accordingly, autonomous direct trading without platform operators is 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, the reliability information for determining the objective reliability of the product or service provider may be provided for the direct transaction.

This blockchain-based information trust engine can be applied to various Internet services (sharing economy, second-hand transactions, real estate transactions, etc.) that require trust as well as financial transactions. It can be applied to all industries for the new development to the trust economy, away from the experience economy based on the existing internet. In particular, by providing cheaper, safer and more reliable trust services, it is possible to create innovative services that do not exist, such as new Uber and new Airbnb. In addition, it is possible to contribute to fostering new industries and creating intelligent jobs by developing blockchain technology, which is a core platform of the 4th Industrial Revolution, free from the controversy of cryptocurrency that has bubble controversy and social problems such as Bitcoin.

1 is a diagram illustrating a concept of a blockchain based information trust engine according to an embodiment of the present invention;
2 is a block diagram of a blockchain-based information trust engine system according to an embodiment of the present invention;
3 illustrates an example of sharing information between nodes based on a channel according to an embodiment of the present invention;
4 is a diagram illustrating a configuration of a blockchain node according to an embodiment of the present invention;
5 is a diagram illustrating a token issuance and use flow according to an embodiment of the present invention;
6 is a diagram illustrating an example in which an information wallet is connected to a smart contract through a dAPP server according to one embodiment of the present invention;
7 is a block diagram of a blockchain-based information trust engine system for information membership management according to an embodiment of the present invention;
8 is a diagram illustrating a configuration of a DApp server according to an embodiment of the present invention;
9 is a view illustrating a membership management service according to an embodiment of the present invention;
10 is a view showing the configuration of an information wallet according to an embodiment of the present invention;
11 is a diagram illustrating an evaluation access control process according to an embodiment of the present invention;
12 illustrates a plate access control process according to an embodiment of the present invention;
13 illustrates a token access control process according to an embodiment of the present invention.

Advantages and features of the present invention, and methods for achieving them will be apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but can be implemented in various forms. It is provided to fully convey the scope of the invention to those skilled in the art, and the present invention is defined only by the scope of the claims. Like reference numerals refer to like elements throughout.

In describing the embodiments of the present disclosure, when it is determined that a detailed description of a known function or configuration may unnecessarily obscure the subject matter of the present disclosure, the detailed description thereof will be omitted, and the following terms are used in the embodiments of the present disclosure. Terms are defined in consideration of the function of the may vary depending on the user or operator's intention or custom. Therefore, the definition should be made based on the contents throughout the specification.

Combinations of each block of the block diagrams and respective steps of the flowcharts may be performed by computer program instructions (execution engines), which may be executed by a processor of a general purpose computer, special purpose computer or other programmable data processing apparatus. As such, instructions executed through a processor of a computer or other programmable data processing apparatus create means for performing the functions described in each block of the block diagram or in each step of the flowchart.

These computer program instructions may also be stored in a computer usable or computer readable memory that can be directed to a computer or other programmable data processing device to implement functionality in a particular manner, and thus the computer usable or computer readable memory. The instructions stored therein may also produce an article of manufacture containing instruction means for performing the functions described in each block of the block diagram or in each step of the flowchart.

In addition, computer program instructions may be mounted on a computer or other programmable data processing device, such that a series of operating steps may be performed on the computer or other programmable data processing device to create a computer-implemented process that may be executed by the computer or other programmable data. Instructions for performing the data processing apparatus may also provide steps for executing the functions described in each block of the block diagram and in each step of the flowchart.

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

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, embodiments of the present invention illustrated in the following may be modified in many different forms, the scope of the present invention is not limited to the embodiments described in the following. Embodiments of the present invention are provided to more fully explain the present invention to those skilled 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 that can share and exchange valuable reliability information through objective and stable reliability management between trading entities. Reliability information includes evaluation information (evaluation), reputation information (reputation), token information (token) and the like for a predetermined information or a person. The information or person may be a reliability evaluation object, a reputation measurement object based on the evaluation, and an object that can be referred to. The information may be a product, a service, or the like. Services may include freelance sharing checks, recruitment, accommodation sharing, vehicle sharing, and real estate / used car sales. The person may be a curator, verifier, freelancer, arbiter, customer, or the like.

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

The blockchain-based trust engine according to an embodiment uses a technique of distributedly recording and storing reliability information in the blockchain in order to increase the reliability of internet information transactions. Accordingly, autonomous direct trading without platform operators is 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 for determining the objective reliability of the product or service provider for the direct transaction.

The blockchain-based trust engine provides a trust information service that can lead to a trust economy that is out of the cryptocurrency blockchain. In this case, blockchain technology, which is mostly concentrated in the financial and security fields, can be spread to various industries. For example, blockchain-based information trust engines can be applied to not only financial transactions but also Internet services that require trust. Internet services can be a sharing economy, second-hand deals, real estate deals, and so on. For example, in the sharing economy, reliability information of a freelancer, used trader's reliability information, and real estate transaction's reliability information may be provided, respectively. At this time, the reliability should be objective and have stability and security.

To ensure objectivity, stability, and security, the blockchain-based trust engine manages reliability information based on the blockchain, and provides the trust engine API by independently specifying the details of the trust engine. At this time, the reliability information is safely stored in the blockchain and the reliability information is managed by a smart contract. Smart contracts are the means by which contracts can be executed digitally. Contracts can be auto-implemented, traceable and irreversible without third party intervention.

It can be easily applied to various industries through the flexible open platform beyond the existing cryptocurrency-oriented blockchain. Most existing blockchain applied application service platforms were closed blockchain systems that can be applied only to specific fields. However, the blockchain-based trust engine according to an embodiment can easily develop a private platform service and apply a market quickly by applying specialized APIs (application programming interfaces) independently of the detailed functions of the trust engine. The blockchain-based information trust engine securely stores and provides verified product profile information and reliability information about people, and can be operated fairly by smart contracts.

The blockchain-based information trust engine can be operated based on an open source private blockchain network. At this time, as well as providing a variety of functions, it provides a differentiation of the performance aspect to easily apply to the actual market and increase product competitiveness. For example, it enhances authorized community security through multi-key access control management. Implement free and secure smart contracts between stakeholders for fair trade and provide unmodifiable credibility information for products and trading partners. In addition, it provides transparent transaction monitoring and blockchain community governance, reduces security solution costs due to prevention of hacking at the infrastructure level, and secures price competitiveness over existing platform providers. Hereinafter, a blockchain-based information trust engine having the aforementioned features will be described in detail with reference to the following drawings.

2 is a block diagram of a blockchain-based information trust engine system according to an exemplary embodiment.

Referring to FIG. 2, the blockchain-based information trust engine system 1 includes a user application 10, a decentralized app server (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 may include a web user application 10-1, a mobile user application 10-2, an information wallet 10-3, and the like.

The information wallet 10-3 manages user keys. At this time, a key for evaluation, a key for reputation and a key (multi-key) for tokens are all managed separately. Accordingly, access to information is different for evaluation, reputation, and tokens, thereby enabling secure access and exchange of information.

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

Blockchain nodes in a blockchain network share information by executing smart contracts through channels, which consist 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 share evaluation information by executing an evaluation smart contract through an evaluation channel. Blockchain nodes 3-5 (140-3, 140-4, 140-5) are reputation smart contract nodes that share reputation information by executing a reputation smart contract over the reputation channel. Blockchain nodes 5-7 (140-5,140-6,140-7) are token smart contract nodes that share token information by executing token smart contracts over token channels. Keys are separated for each piece of reliability information through the information wallet 10-3, and channels for sharing information are also used for each piece of information.

According to an embodiment of the present invention, before the blockchain node executes an evaluation, reputation, or token smart contract for each evaluation, evaluation, reputation, or token smart contract node, step 1: user access control step and step 2: access control step by information Is preceded. For example, an access control smart contract node first checks a user's access rights through an access control smart contract. When the user access authority is verified, the information access authority is secondly verified by validating the evaluation information, reputation information, or token information for each evaluation, reputation, or token smart contract node. Once the access to the information is confirmed, the evaluation, reputation or token smart contract will be executed. In access control of information, security can be increased by allowing access of a multi-signer requiring multiple approvers' signatures.

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

The blockchain platform according to an embodiment is operated based on a private block-chain. Private blockchains can access the blockchain only by authorized members, and use a consensus algorithm such as the PBFT algorithm for consensus, resulting in relatively short transaction time and high processing performance. . Authentication of members, encryption of information, and access control are possible. In this case, the consensus is a method in which the blockchain participating nodes generate a block which is a shared book and store the block if the consensus succeeds after validation.

The off-chain DB 16 is a DB located outside of the blockchain network 14, where off-chain stores information (e.g. profile information) or large amounts of data that are better stored outside the chain due to privacy. do.

3 illustrates an example of sharing information between nodes based on a channel according to an embodiment of the present invention.

Referring to FIG. 3, a blockchain network is composed of a plurality of organizations (eg, org1, org2 in FIG. 3) and a consensus leader node, and each organization is comprised of peer nodes and a CA. The consensus leader node ensures blockchain consistency and delivers guaranteed transactions to peer nodes on the network. The consensus leader node is also responsible for authenticating the identity and role of members in the supply chain. A Certificate Authority (CA) authenticates users who request transactions.

Peer nodes in each organization execute smart contracts, control access to ledger data, and guarantee transactions. In this case, the peer nodes may include 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, It includes a token smart contract node that uses a token channel to perform a token issue transaction. As the channels are separated and operated for each information, information security and stability are guaranteed.

4 is a diagram illustrating a 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 retrieval in the case of an evaluation transaction, reputation calculation, evaluation information storage and retrieval in the case of a reputation transaction, and stores and retrieves new token information in the case of a token transaction.

The blockchain engine 160 according to an embodiment includes an access controller 161, a smart contract controller 162, a transaction controller 163, a block generator 164, and a consensus controller 165. Each component described above may perform its function in different blockchain nodes according to the transaction flow. For example, the access control unit 161 in the access control smart contract node, the smart contract control unit 162 and the transaction control unit 163 in the evaluation smart contract node, reputation smart contract node or token smart contract node by information type, block The generation unit 164 may perform the function at the block generation node and the consensus control unit 165 at the block agreement node.

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

For example, 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 the evaluation access control operation. When the evaluation contents signature and the one-time shared secret are received from the evaluator, the evaluator verifies the validity of the one-time shared secret and checks the signature with the retrieved public key by checking the evaluator's public key on the blockchain. When the evaluator verification is made, the smart contract control unit 162 calls the evaluation smart contract interface. The evaluation access control process will be described later with reference to FIG.

As another example, the access control unit 161, upon the user's request, the access control smart contract interface is called from the dAPP server 12 according to the user's request, and the access control unit 161 confirms whether the reputation can be viewed on the blockchain through the access control smart contract interface. . In addition, the controller determines whether access is possible through multi-signatures, and if the access is approved, the smart contract controller 162 calls the flat smart contract interface. The plate access control process will be described later with reference to FIG.

The smart contract controller 162 manages and executes smart contracts for evaluation, reputation, and tokens, respectively. The smart contract control unit 162 according to an embodiment inquires the reputation information in the blockchain through the reputation smart contract interface by the call of the access control unit 161 during the reputation inquiry operation, the dAPP server 12 To provide.

The transaction control unit 163 performs and manages an evaluation, reputation or token transaction through each smart contract executed by the smart contract control unit 162. For example, an evaluation smart contract performs an evaluation calculation transaction, a reputation smart contract performs a reputation calculation transaction or a reputation inquiry transaction, and a token smart contract performs a token issue transaction. According to an embodiment, the transaction controller 163 performs an evaluation calculation through an evaluation calculation transaction, issues a token through a token issuance transaction as a reward for performing the evaluation, and uses the issued token to look up a reputation through a reputation inquiry transaction. do.

The block generator 164 generates a block by collecting the final smart contract output from the transaction controller 163. At this time, a new block in which transaction information newly generated for a specific period is recorded is generated. The smart contract final output may be <smart contract function signature, result value> in the case of an evaluation transaction. The result can be <readset, writeset>. Here, readset is <key, value> input value before transaction processing and writeset is <key, value> output value after transaction processing. The agreement controller 165 agrees a block according to a block agreement request of the block generator 164. Then, the block is delivered to all participating nodes, and the transaction result is transmitted to the dAPP server 12.

The block agreement of the block generation and negotiation controller 165 of the block generation unit 164 may be different according to a given consensus method. For example, in the case of the Delegated Proof of Stake (DPoS) method, a block generation node is selected based on the token quantity. In the case of PBFT (Practical Byzantine Fault Tolerance), a block generation node is selected by a reader selection algorithm. When the node that created the block becomes a client and requests consensus on the entire block, not the transaction number, the leader node confirms the block (block height, block contents (smart contract final output collection)) and passes it to another node. After verifying <readset, writeset> through -prepare, prepare, and commit steps, the node connects to its own blockchain and writes it to 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 that share the same channel. The block storage unit 172 stores a block generated according to the transaction flow. The smart contract storage unit 173 stores a smart contract for performing a transaction flow.

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

5 is a diagram illustrating a token issuance and use flow according to an embodiment of the present invention.

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

6 is a diagram illustrating an example in which an information wallet is connected to a smart contract through a dAPP server according to an embodiment of the present invention.

Referring to FIG. 6, the information wallet 10-3 invokes a REST API to the dAPP server 12. The REST API of the dAPP server 12 performs blockchain network management, user (key) management, and access control management. At this time, management can be made for each evaluation, reputation, and token.

7 is a diagram illustrating a configuration of a blockchain based information trust engine system for managing information membership according to an embodiment of the present invention.

Referring to FIG. 7, the information wallet 10-3 requests token issuance, remittance, and balance inquiry in the case of a token transaction through a REST API, requests a user evaluation, an inquiry of evaluation contents in the case of an evaluation transaction, and a reputation transaction. In case of request for reputation calculation and evaluation. REST API can perform blockchain network management, user (key) management and access control management. At this time, management can be made for each evaluation, reputation, and token.

The dAPP server 12 provides a REST API to the information wallet 10-3 and calls the smart contract interface of the blockchain node 140. In this case, in order to correspond to various blockchain platforms, a common interface for invoking smart contract interfaces is defined. The description thereof will be described later with reference to FIG. 8.

The smart contract interface of the blockchain node 140 stores and retrieves new token information for token transactions, stores and retrieves evaluation information for evaluation transactions, and calculates reputation, stores and retrieves reputation information for reputation transactions. Perform

8 is a diagram illustrating a configuration of a DApp server according to an embodiment of the present invention.

Referring to FIG. 8, the dAPP server 12 may include an API unit 120, a user membership manager 122, a network manager 124, a blockchain network common interface 126, and a blockchain network platform-specific gateway 128. Include.

The API unit 120 provides a REST API to the user application according to a request of the user application and calls the smart contract interface to the blockchain node.

The user membership manager 122 manages user membership through user key and access control management. According to an embodiment, the user membership manager 122 sets up a user membership service. The membership service serves as a certificate issuer for blockchain nodes and user applications and is responsible for authenticating blockchain nodes and clients.

According to an embodiment, the user membership manager 122 registers a user account (id / password) and maps a public key to a user account in a key pair (public key and private key) generated in an information wallet. Stored in the membership blockchain (id, public key, password). When a user signs with a private key and requests a certificate, it enrolls a signed certificate. When a user requests a transaction including the user object information (private key, certificate (id, public key)), the user membership blockchain checks the user membership and signature, and if the user is unregistered, rejects the transaction and passes the registration. User membership blockchain can be managed in the on-chain DB for stability of the DB.

The network manager 124 manages the authority of the nodes participating in the blockchain network and manages separate channels into channels for evaluation, channels for reputation, and channels for tokens, so that the corresponding information between blockchain nodes can be controlled through the same channel. Share it.

The blockchain network common interface 126 provides a common interface for invoking smart contract interfaces to correspond to different blockchain network platforms 14. The blockchain network platform 14 includes a Hyperledger Fabric blockchain network, a Hyperledger Sawtooth blockchain network, an It-chain blockchain network, an EOS blockchain network, an Ethereum blockchain network (PoA), and the like. By abstracting the interface of the various blockchain network platforms 14 through the blockchain network common interface 126, even if a new blockchain platform is added, it is easy to respond.

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

Referring to FIG. 9, a membership includes an information membership 900, a user membership 910, and a node membership 920. Information membership is managed per information, including token membership 902, evaluation membership 904, and reputation membership 906. The user membership 910 registers a user account (id / password), maps the public key with the user account in a key pair (public key and private key) generated in the information wallet and stores the user key in the user membership blockchain ( id, public key, password). When a user signs with a private key and requests a certificate, it enrolls a signed certificate. When a user requests a transaction including the user object information (private key, certificate (id, public key)), the user membership blockchain checks the user membership and signature, and if the user is unregistered, rejects the transaction and passes the registration. User membership blockchain can be managed in the on-chain DB for stability of the DB. Node membership 920 may be managed independently of the other two memberships 900, 910.

10 is a diagram illustrating a configuration of an information wallet according to an embodiment of the present invention.

Referring to FIG. 10, the information wallet 10-3 includes an app 100, a connection controller 102, an account storage controller 104, and a UTXO storage controller 106. The app 100 transmits a control command to the connection controller 102, the account storage controller 104, and the UTXO storage controller 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 usage-specific key pairs (public key, private key) such as token, evaluation, and reputation. UTXO information refers to transaction information that has not yet been consumed among token transaction records recorded in the blockchain, and may be replaced with other information that performs the same function.

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

4 and 11, the evaluation manager creates a new evaluation session and selects an evaluator (1100). The evaluator may be one selected by the evaluator as the evaluator. At this time, the access control unit 161 generates 1102 a one-time shared secret for the evaluation session, and transmits a one-time shared secret to the evaluators (1104). The one-time shared secret may be randomly generated for each evaluation session and destroyed after the evaluation session ends. The evaluator signs 1106 the evaluation contents with his evaluation private key, and transmits the evaluation contents signature and the one time shared password to the access control unit 161 (1108). The access control unit 161 confirms the one-time shared secret, and verifies the signature with the evaluator's public key (1110). The evaluator's public key can be retrieved from the user membership blockchain. The access control unit 161 may perform the function in the access control smart contract node.

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

2, 4, and 12, a reputation query user who wants to inquire a reputation of a specific evaluator requests a reputation inquiry of a specific evaluator through the user application 10 (1200). The dAPP server 12 then calls the access control smart contract to the access control unit 161 (1202). The access controller 161 confirms whether access control is performed using the user level (1204), and verifies whether the access control is possible through the multi-signature (1206). The user class may be (a group of assessors, a group of evaluators, a group of information buyers). When access control is confirmed 1204, multi-signature verifies availability (1206), for example, Step 1: Approver (2 of 3 reputation managers), Step 2: Simultaneous verification (multi-signature) signature of (evaluator, reputation requestor).

13 illustrates a token access control process according to an embodiment of the present invention.

2, 4, and 13, a user who wants to access a token signs a new token (UTXO) with a token private key through the user application 10 (1300). Then, the dAPP server 12 transmits the transaction signed by the token (UTXO) and the private key to the access control unit 161 (1302). The access control unit 161 inquires (1304) the token public key of the user in the user membership blockchain, and verifies the token (UTXO) signature with the user public key (1306). When the signature is verified, the smart contract controller 162 calls the token smart contract to execute the token smart contract (1308). The access control unit 161 may be an access control smart contract node, and the smart contract control unit 162 may be a token smart contract node.

So far, the present invention has been described with reference to the embodiments. Those skilled in the art will appreciate that the present invention can be implemented in a modified form without departing from the essential features of the present invention. Therefore, the disclosed embodiments should be considered in descriptive sense only and not for purposes of limitation. The scope of the present invention is shown in the claims rather than the foregoing description, and all differences within the scope will be construed as being included in the present invention.

Claims (14)

User application;
A blockchain network composed of blockchain nodes that provide a blockchain-based information trust service for sharing and trading reliability information while maintaining and managing information or reliability information on a blockchain; And
A distributed app server for relaying between a user application and a blockchain network; Including,
Blockchain nodes
Accessing information by information using different keys and channels by using multiple channels having separate channels for sharing information for each information constituting reliability information and multiple keys having separated keys for access for each information And sharing are different,
Distributed app servers
Network management unit that manages the authority of nodes participating in the blockchain network and manages separate channels into channels for evaluation, channels for reputation, and channels for tokens, so that corresponding information can be shared between blockchain nodes through the same channel. ;
An API unit for providing a REST API to the user application according to a request of the user application and calling a smart contract interface to the blockchain node;
A user membership manager that manages user membership through user key and access control management; And
A blockchain network common interface that provides a common interface for invoking smart contract interfaces to correspond to different blockchain network platforms;
Blockchain based information trust engine system comprising a. The method of claim 1, wherein the reliability information is
A blockchain-based information trust engine system comprising information or reputation information, reputation information, and token information. The node of claim 1 wherein the blockchain node is
It has multi channel including evaluation channel, reputation channel and token channel, and each channel is operated separately.
By sharing evaluation information among 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, Block-based trust engine system, characterized by sharing information between blockchain nodes. The node of claim 1 wherein the blockchain node is
First, check the access rights of users through the access control smart contract,
When the user's access authority is confirmed, the access authority by information is verified by secondly validating the evaluation information, reputation information or token information by evaluation, reputation or token smart contract.
Block chain based information trust engine system, characterized in that if the information access authority is confirmed, the evaluation, reputation or token smart contract is executed. delete delete User application;
A blockchain network composed of blockchain nodes that provide a blockchain-based information trust service for sharing and trading reliability information while maintaining and managing information or reliability information on a blockchain; And
A distributed app server for relaying between a user application and a blockchain network; Including,
Blockchain nodes
Accessing information by information using different keys and channels by using multiple channels having separate channels for sharing information for each information constituting reliability information and multiple keys having separated keys for access for each information And sharing are different,
In the evaluation information access control operation, a one-time shared password is generated for the evaluation session and a one-time shared password is sent to the evaluator.When the evaluation information signature and the one-time shared password are received from the evaluator, the one-time shared password is checked and the evaluator's public key The blockchain-based information trust engine system of claim 1, wherein the blockchain-based information trust engine system calls the evaluation smart contract interface when the evaluator is verified. User application;
A blockchain network composed of blockchain nodes that provide a blockchain-based information trust service for sharing and trading reliability information while maintaining and managing information or reliability information on a blockchain; And
A distributed app server for relaying between a user application and a blockchain network; Including,
Blockchain nodes
Accessing information by information using different keys and channels by using multiple channels having separate channels for sharing information for each information constituting reliability information and multiple keys having separated keys for access for each information And sharing are different,
During the reputation information access control operation, the access control smart contract interface is called from the distributed app server according to the user's request, and the access control smart contract interface is checked to see if the reputation can be viewed on the blockchain, and the multi-signature of the multiple users A blockchain-based information trust engine system that checks whether or not access is possible by checking the availability, and calls a reputation smart contract interface when the access is approved. The node of claim 1 wherein the blockchain node is
An on-chain DB in which reliability information shared and shared between blockchain nodes sharing the same channel is stored;
A block storage unit storing a block generated according to the transaction flow; And
Smart contract storage unit for storing a smart contract for performing a transaction flow;
Blockchain based information trust engine system comprising a. The method of claim 9, wherein the on-chain DB
And a public key hash value hashing the public key instead of the user ID to ensure the anonymity of the reliability information when storing the reliability information. The method of claim 1, wherein the user application
A web user application;
Mobile user applications; And
An information wallet user application for separately storing and managing user keys for evaluation, reputation, and tokens, respectively;
Blockchain based information trust engine system comprising a. delete The method of claim 1, wherein the user membership management unit
Register a user account (id / password) and map the public key to the user account in the key pair (public key and private key) generated by the information wallet user application and store it in the user membership blockchain (id, public key) , password),
If a user signs a transaction by signing with a private key, the user membership blockchain checks the user membership and signature, and if the user is unregistered, rejects the transaction and passes if the registration is successful. User application;
A blockchain network composed of blockchain nodes that provide a blockchain-based information trust service for sharing and trading reliability information while maintaining and managing information or reliability information on a blockchain;
A distributed app server for relaying between a user application and a blockchain network;
An on-chain DB located inside the blockchain and storing only hash values of personal data and storing member information permitted to access the blockchain; And
An off-chain DB located outside the blockchain and storing information requiring privacy; Including;
Blockchain nodes
Accessing information by information using different keys and channels by using multiple channels having separate channels for sharing information for each information constituting reliability information and multiple keys having separated keys for access for each information And a blockchain based information trust engine system, wherein sharing is different.

Images