Linkeye is a personal credit data platform built on the basis of the immutable and decentralized technical characteristics of the blockchain. Reduce the cost of credit investigation on each platform and improve the accuracy of platform credit investigation, so as to achieve the purpose of reducing bad debts and building a good operating environment.

Project Introduction

LinkEye is a self-developed credit reporting and sharing alliance chain solution based on blockchain technology. Based on the Chinese, Southeast Asian and European markets, LinkEye shares the list of untrustworthy persons among the members of the alliance through the deep integration of blockchain technology and credit economic models, and connects the islands of credit reporting data to form a real, reliable and wide-ranging coverage of the whole society. Credit database, effectively promote and improve the social credit system, and finally realize the equality of everyone before credit.

The LinkEye team has rich experience in the credit industry and the blockchain field, can accurately find the core entry point of the credit alliance, designed and developed the current efficient blockchain credit data sharing platform, through the blacklist Mechanism (mask + signature), alliance member entry mechanism, member credit mechanism, arbitration mechanism, information sharing mechanism, intelligent pricing mechanism, data security firewall mechanism, open whole network query interface and other methods to ensure the efficient and orderly development of the alliance platform. At the same time, LinkEye has reached strategic cooperation with many first-line credit platforms in China to open and share the list of core dishonest persons. It will also carry out in-depth cooperation with other financial institutions in Southeast Asia, Europe and other regions to jointly build a credit alliance in the blockchain industry.

Project Highlights

Based on blockchain technology

Traditional data centers usually store data on a central node. This central node is completely controlled by the data center, and the data center can modify and delete these data at will. This creates the risk that the data center sells fake data, tampers with or deletes data for profit reasons. The current data alliance model is generally that multiple small data centers are attached to a large data center, and the small data center and the large data center perform data exchange. In this model, small data centers cannot trust each other, and all data is exchanged through large data centers. The end result is that large data centers take all the data for themselves.

Blockchain is a decentralized distributed data storage technology. Its core value is to create a safe and credible system that allows institutions or individuals who do not trust each other to exchange information and data with mutual trust without the coordination of an authoritative central organization. At the same time, through cryptography, distributed consensus protocol, consensus protocol, peer-to-peer network communication and other technical means, the blockchain realizes that the data cannot be tampered with and cannot be deleted.

LinkEye uses blockchain technology. Once the credit information is published on the chain, it can never be deleted or modified. At the same time, each data center can share data with mutual trust.

Deep insight into the industry

The LinkEye team is composed of a group of professional financial professionals who have profound experience in the traditional financial industry and are also pioneers in the Internet financial industry that has developed in recent years. They have a good understanding of the application, and have a scientific and clear understanding of the project's operability, implementation, and development.

Successful experience

LinkEye team has more than 3 years of project experience, with first-class risk control, operation, business, product and development capabilities. Cooperated with more than 1,000 third-party financial companies, successfully operated a payment platform with a monthly transaction volume of over 5 billion, and successfully operated a credit platform with millions of users. It has very professional project capabilities in this field.

The team has a wealth of experience. The team has the first batch of blockchain project participants and the first batch of Internet financial project participants. It has rich industry experience and has a deep understanding of the blockchain and credit reporting fields, and can accurately grasp the key points of the industry. Using blockchain to solve practical problems in the field of financial credit investigation, the team has unique accumulation.

Resource advantage

The core of establishing a blockchain-based credit reporting alliance is to expand the number of high-quality members and high-quality data of the alliance. The LinkEye team has been deeply involved in the credit field for many years. Combining the concept and technical advantages of the LinkEye project itself, at the beginning of the project , has established strategic cooperation with some first-line credit institutions in China and Southeast Asia, and the initial data accumulation has reached one million levels, and continues to rapidly expand the alliance database, which can reach tens of millions of data volumes at the initial stage of the project.

Technical advantages

Current blockchain projects are mostly public chains or alliance chains. The public chain is relatively mature, stimulated by the economic model, maintained by a large number of participants, and naturally has good community support. However, the performance is often poor, lack of authority management, and the information is completely disclosed. Consortium chains are more used in commercial alliance scenarios. Consortium chains often make certain compromises on decentralization and accessibility in terms of architecture design in exchange for performance and security improvements.

LinkEye's cross-regional credit investigation service is very complex, and multiple non-technical and technical indicators such as law, culture, region, scalability, security, and stability must be considered. The core requirements include:

➢Regional differences in law, regulation and culture;
➢Optimized governance mechanism for multi-center collaboration;
➢Performance requirements such as throughput and delay;
➢Accessibility and accessibility ;
➢Security and Privacy;
➢System adjustment and repair mechanism.

Based on the above problems, the current mature blockchain solutions cannot meet linkeye's business and technical needs, and a new set of solutions must be designed according to the needs of supporting business scenarios.

LinkEye proposed the concept of "region-oriented sovereign credit investigation alliance chain", which is essentially a alliance chain operating within a specific sovereign scope, which makes it easier to deal with problems from different legal frameworks and different regulatory policies easy. At the same time, the "Region-Oriented Sovereign Credit Alliance Chain" is not a partial, simple, and isolated scheme design. It is part of LinkEye's overall system and comprehensively conceived solution, together with "Achain-based cultural asset trading platform, and Corresponding Token and economic system", "LinkEye middleware" and "LinkEye cross-chain interaction protocol" together form a complete solution.

LinkEye sovereign alliance chain

LinkEye Sovereign Consortium Chain is a self-developed high-performance consortium chain solution. Its underlying technical framework is based on the norms and standards of the Hyperledger project, and a series of independent transformations and enhancements have been made for credit reporting application scenarios.

LinkEye consortium chain also adopts the digital certificate mechanism recommended by the industry to realize identity authentication and authority control. The CA node implements the PKI service, which can issue identity certificates in advance and send them to the corresponding member entities to control the entity's access to various resources in the network. At the same time, the LinkEye consortium chain can manage various data operation permissions through permission policies (policy), and solve the problem of "who is allowed to take a certain operation in a certain scenario".

The basic capability provided by the chaincode in Fabric is to read and write the state. The endorser simulates the execution of the transaction and returns the read-write set (read-writeset) as a result, and the committer performs MVCC verification on the sorted batch transactions. If a transaction performs a state write operation in the verification phase, the current version of all states in the corresponding read set must be consistent with the endorsement. Otherwise, the transaction will be marked as invalid. This is a compromise between usability and consistency. A typical effect is that for basic transfer operations, an account can only be operated once in the same block (whether it is transferred in or transferred out).

For the above problems, the LinkEye consortium chain supports multiple transfers to the same account in the same batch of transactions. On the side of the chaincode container, several new interfaces have been added for ChaincodeStubInterface, so that chaincode developers can flexibly use the above capabilities.

LinkEye alliance chain middleware

The existing underlying framework has problems such as transaction loss, general performance, irreparable failures, and low scalability, so it cannot be directly applied to the field of credit investigation. Based on the above problems, LinkEye proposes a middleware solution for the alliance chain.

Transaction lost

•Aiming at the situation that the queue is full, measures are taken to restrict the block chain from being written to TPS, and the transaction is first stored in the middleware.

Performance issues

The processing capacity of the current underlying framework is around 1000tps, but when the external request is much higher than the processing capacity, the system will not be able to respond in time, and unpredictable problems may occur. The LinkEye alliance chain middleware restricts the area through the token bucket algorithm The block chain is written to tps to improve system availability.

The design idea of ​​this algorithm comes from life: for example, fuses are installed in old-fashioned electric switches. Once someone uses super-high-power equipment, the fuse will be blown to protect each electrical appliance from being burned out by strong current.

Full bugfix

LinkEye's sovereign alliance chain is deployed in different regions. If a large-scale failure occurs in the regional network, all nodes at the bottom layer will be abnormal, and consensus cannot be formed, data will not be consistent, and even recovery will not be possible.

LinkEye consortium chain middleware will cache the requests of each node. When the network recovers, it will re-initiate the request to ensure that each node reaches a consensus and the data remains consistent.

Multi-chain access

The application needs to access the data of multiple chains, so the application needs to maintain the access information of multiple chains. LinkEye consortium chain middleware uniformly configures multi-chain access information such as: chainID, IP, port, etc. The application layer only needs to know the chainID.

Contract data fragmentation

Each node of the LinkEye Credit Information Alliance will maintain a large amount of data. When the data reaches a certain level, the read and write performance will decrease exponentially. LinkEye middleware partitions and fragments the stored data through the deployment of smart contracts: the same contract is deployed on multiple chains to partition the data, and the same contract modifies the label identification and is deployed on the same chain to fragment the data.

Then the data is queried and written through the contract routing, and the same contract is deployed on multiple chains, and the partition key is the primary key ID. Primary key ID% number of partitions -> chainID. Same as the contract single-chain deployment, the shard key is the primary key ID. Primary key ID% number of shards -> chaincodeseq (contract serial number).

Smart contract upgrade

The data structure of the contract storage has changed, and the existing amount cannot be processed compatible. If the contract storage structure changes and the stock data is incompatible, the transaction corresponding to the stock data will be retrieved from the LinkEye alliance chain middleware, executed first in the new contract, and then the new transaction will be received.

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