Linkeye is a personal credit data platform built on the untampered and decentralized technology characteristics of blockchain. Its purpose is to reduce the credit reporting costs of various platforms and improve the platform's credit reporting accuracy by integrating and sharing credit information from various financial institutions such as P2P and cash loans, thereby achieving the goal of reducing bad debts and building a good operating environment.

Project Introduction

LinkEye is a set of independently developed credit sharing alliance chain solutions based on blockchain technology. Based in the Chinese, Southeast Asian and European markets, LinkEye shares a list of dishonest persons among alliance members through the in-depth integration of blockchain technology and credit economic model, and connects various credit data silos to form a real, reliable and wide-coverage credit database for the whole society, effectively promotes and improves the social credit system, and ultimately achieves equality for everyone before credit.

LinkEye team has rich experience in the credit industry and blockchain field. They can accurately find the core entry point of the credit reporting alliance, and design and develop the current efficient blockchain credit data sharing platform. Through blacklist mechanism (mask + signature), alliance member settlement mechanism, member credit mechanism, arbitration mechanism, information sharing mechanism, intelligent pricing mechanism, data security firewall mechanism, open network query interface, etc., ensure the efficient and orderly development of the alliance platform. At the same time, LinkEye has reached strategic cooperation with many first-tier Chinese credit platforms, open up and share the list of core dishonest persons, and will gradually carry out in-depth cooperation with other financial institutions in Southeast Asia, Europe and other regions to jointly build a credit reporting alliance for 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 of data centers selling fake data, tampering with or deleting data for profit reasons. The current data alliance model is generally that multiple small data centers are attached to a large data center, and small data centers and large data centers perform data exchange. In this mode, 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 trustworthy system that allows institutions or individuals who do not trust each other to interact with information and data without the coordination of authoritative central institutions. At the same time, blockchain realizes data immutability and deletion through technical means such as cryptography, distributed consistency protocol, consensus protocol, and point-to-point network communication.

LinkEye uses blockchain technology. Once the credit information is published on the chain, it will never be deleted and modified. At the same time, each data center can share data that is trusted by each other.

Deep Industry Insight

LinkEye team is composed of a group of professional financial personnel, with deep experience in the traditional financial industry, and is also a pioneer in the Internet finance industry that has developed in recent years. Therefore, it has a good understanding of the generation of credit data and its application in the mobile Internet society, and has a scientific and clear understanding of the operationality, implementation and development of the project.

Successful Experience

The LinkEye team has more than 3 years of project experience and has first-class risk control, operation, business, product and development capabilities. There are more than 1,000 third-party financial companies in cooperation, and have successfully operated payment platforms with monthly transaction volume of over 5 billion yuan, and successfully operated a credit platform with million-level users. They have very professional project capabilities in this field.

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

Resource Advantages

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 engaged in the credit field for many years. Combined with the concept and technical advantages of the LinkEye project itself, at the beginning of the project, it has established strategic cooperation with some first-line credit institutions in China and Southeast Asia. The initial data accumulation has reached one million, and the alliance database has continued to rapidly expand, which can reach tens of millions of data at the beginning of the project.

Technical Advantages

Most blockchain projects are public chains or alliance chains. The public chain is relatively mature, and through economic model stimulation, it has received maintenance from a large number of participants, and naturally has good community support. However, the performance is often poor, lacks permission management, and the information is completely disclosed. Alliance chains are more used in commercial alliance scenarios. Alliance chains often make certain compromises on decentralization and accessibility in architecture design in exchange for performance and security improvements.

LinkEye targets cross-regional credit reporting services, which are very complex, are required to consider multiple non-technical and technical indicators such as law, culture, geography, scalability, security, and stability. The core requirements include:

➢Geographical differences in laws, supervision and culture;
➢ Optimized governance mechanism for multi-center collaboration;
➢ Performance requirements such as throughput and latency;
➢Accessibility and accessibility;
➢Security and privacy;
➢ System adjustment and repair mechanism.

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

LinkEye proposed the concept of a "geographically oriented sovereign credit reporting alliance chain", which is essentially a alliance chain running within a specific sovereign scope, which makes it easier to deal with problems from different legal frameworks and different regulatory policies. At the same time, the "geographically oriented sovereign credit reporting alliance chain" is not a partial, simple and isolated solution design. It is part of the overall system and comprehensively conceived solution. Together with the "Achain-based cultural asset trading platform and corresponding tokens and economic systems", "LinkEye Middleware" and "LinkEye Cross-chain Interaction Protocol" form a complete solution.

LinkEye Sovereign Alliance Chain

LinkEye sovereign alliance chain is a set of independently developed high-performance alliance chain solutions. Its underlying technical framework relies on the specifications and standards of the Hyperledger project, and has carried out a series of independent transformations and enhancements for credit reporting application scenarios.

LinkEye Alliance Chain also uses the industry-recommended digital certificate mechanism to achieve identity authentication and permission control. The CA node implements PKI services, which can issue an identity certificate in advance and send it to the corresponding member entity to control the entity's access to various resources in the network. At the same time, the LinkEye alliance chain can manage various operation permissions of data through permission policies to solve the problem of "who is allowed to take a certain operation in a certain scenario".

The basic ability provided by chain code in Fabric is to read and write states. Endorser simulates the execution of transactions and returns read-writeset as the result. The committer performs MVCC verification of the sorted batch transactions. If a transaction performs a state write operation during the verification process, the current version of all states in the corresponding read set must be consistent with the endorsement execution. Otherwise, the transaction will be marked as illegal. This is a compromise to consistency in usability. A typical impact is that for basic transfer operations, an account can only be operated once in the same block (regardless of transfer in or out).

For the above issues, in order to support multiple transfers of the same account in the same batch of transactions. On the chaincode container side, several interfaces have been added to ChaincodeStubInterface, allowing chaincode developers to flexibly use the above capabilities.

LinkEye Alliance Chain Middleware

The existing underlying framework has problems such as transaction loss, average performance, irreparable failures, and low scalability, and cannot be directly applied to the credit reporting field. LinkEye proposes a alliance chain middleware solution based on the above problems.

Transaction lost

•In response to the situation where the queue is full, the measure of restricting the blockchain from writing to TPS, transactions first, and transactions first are stored in middleware.

Performance Issues

The current processing capacity of the underlying framework is around 1000tps, but when external requests are far higher than the processing capacity, the system will not be able to respond in time, and unpredictable problems may arise. LinkEye Alliance Chain Middleware restricts blockchain writing to tps through the token bucket algorithm to improve system availability.

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

Full fault repair

LinkEye sovereign alliance chain is deployed in different regions. If a large-scale failure occurs in this region network, resulting in abnormalities of all the underlying nodes, unable to form a consensus, unable to be consistent, and even unable to recover.

LinkEye Alliance Chain Middleware will cache requests from each node. After the network is restored, a new request will be initiated to ensure that each node reaches a consensus and the data remains consistent.

Multi-chain access

Application needs to access data from multiple chains, so the application needs to maintain access information from multiple chains. LinkEye alliance chain middleware uniformly configures access information for multiple chains such as chainID, IP, port, etc. The application layer only needs to know chainID.

Contract data sharding

Each node of the LinkEye Credit Information Alliance maintains massive amounts of data, and when the data reaches a certain level of magnitude, the read and write performance will be exponentially reduced. LinkEye middleware partitions and shards the stored data through smart contract deployment: the same contract is deployed on multiple chains to partition the data, and the same contract is modified to identify the label and deployed on the same chain to shard the data.

The data is then queried and written through contract routing, and the same contract is deployed in multiple chains, with the partition key as the primary key ID. Primary key ID % partition number -> chainID. Deployment of single-chain contracts, the shard key is the primary key ID. Primary key ID % shard number -> chaincodeseq (contract serial number).

Smart Contract Upgrade

The contract storage data structure changes, and the existing number cannot be processed compatible. If the contract storage structure changes and the existing data is incompatible, the transaction corresponding to the existing data will be re-extracted from the LinkEye Alliance Chain middleware, execute it first in the new contract, and then receive the new transaction.

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