Xue Manzi as a consultant to the new project, to focus on the data exchange platform XChain

Edit: pencil casen
With the fiery blockchain, many elites from the traditional academic community joined in. Recently, a group of PhD team with overseas backgrounds made a new blockchain project: a decentralized data trading platform called XChain. Let’s take a look at the project introduction (from the project team and the official website):n

XChain (http://www.xchainstudio.net/) The team focused on solving the problem of data value discovery and revaluation for offline SMEs, and is committed to creating a distributed data trading platform that enables the data information of such enterprises to be capitalized, And can be effective quickly and effectively for circulation.n

Sectors spotted by the team are as follows:n
1, SMEs hold almost half of the global data information, but are all data islands, valuable information can not be easily traded and circulated, a large number of digital assets can not be used.n
2. Large-scale enterprises located in a monopoly position in the industry are influencing all aspects of the world while bringing about huge profits by reasonably operating their own accumulated big data.n
3, Because of the scattered data, big data application and data analysis are severely hindered, and there is mutual distrust among different data sources, resulting in serious deviation of data analysis results.n
4, the traditional data exchange there is serious information asymmetry, data buyers and sellers on the quality of the data often have differences.n
5, the privacy of data in the traditional way of data transactions can not be protected, the privacy of citizens are often severely violated.n
6, due to the data storage and easy replication, resulting in the prevalence of illegal use and transaction data. At the same time, legitimate data providers often do not receive due benefits, which directly causes data providers to prefer “one-shot buying and selling”, which in turn raises data prices and affects the effective circulation of data.n
7, a single data provider of incomplete data types, the number of insufficient.n
8, the data transaction, the price is not transparent.n
9, data is too scattered, resulting in data buyers (users) In order to obtain useful data, often requires a lot of time and cost, inefficient.n

The solution provided by the team is:n
1, Through the blockchain technology, let the data trading process open, fair, just and smooth, so that both parties to data transactions more mutual trust.n
2, through the cryptography, privacy protection data.n
3, the use of data sandbox mechanism to solve the problem of insufficient or insufficient data types.n
4, SDEP data in the system price tag, data transactions become transparent, simple, greatly reducing data acquisition costs.n
5, Sandbox automatic data destruction mechanism to protect the data provider’s intellectual property rights, data providers should protect the continuing benefits.n
6, the use of data buyers (users) strict certification, data users for the illegal use of data to take responsibility, thereby protecting the data privacy section.n
7, provide a variety of specific services for open trusted data transactions, and open API, SDK and other components to support third-party features access platform. So that data transactions more convenient, fast, efficient, low-cost, and promote data flow.n
8, through the blockchain voting mechanism to ensure data quality.n
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(Related technical terms explained as follows)n
Blockchain and smart contracts:n
Blockchain and smart contract technologies ensure that all transaction information is open, transparent, tamper-proof and traceable, fully reflecting the status of data transactions, ensuring the execution of contracts and building trust.n
Data sandbox mechanism:n
SDEP system has two kinds of data matching mode. One is one-to-one (point-to-point) task, that is, SDEP sends a request to the seller according to the buyer’s task request. The seller’s data is desensitized and sent to the buyer.n
The other one is a one-to-many (point-to-many) task. In a one-to-many task, the data buyer finds N data sellers according to the data type required and sends a purchase request to the seller. Corresponding data from different sellers are desensitized After processing, it is sent to the sandbox created by the SDEP smart contract in another non-data seller node in the federation, and the buyer imports the algorithm to perform the collaboration operation. After the result is obtained, the result is fed back to the buyer, The mechanism, along with the original data in the sandbox, is destroyed together to ensure that the original data is safe.n
Therefore, through the data sandbox, can effectively solve the single seller data type is not complete, or the problem of insufficient data. More importantly, creating “out of the box” data isolation sandboxes ensures data security in multiple data source collaboration and protects the rights of data asset providers.n
“Data Sandbox” is one of the pioneering projects of XChain project, which can only be solved by smart contracts on the blockchain. Is the application of smart contracts in the data exchange industry innovationn

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Multi-source data collaborative computingn
This technology is the core technology in the sandbox mechanism described above.n
The sandbox mechanism provides a “one-to-many” solution to data supply and demand mode, which solves the problem of insufficient data type and insufficient data amount of a single data provider. However, how data from different sources work together, how to consolidate data from these different sources, and how to avoid information leakage between data providers. “Multi-source data collaborative computing” provides a unique algorithm.n
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XID generalized data encryption technologyn
The traditional data transaction is the biggest problem of data security and privacy protection, XID generalized encryption technology for these two issues provide a solution.n
XID generalization principle draws on a common electronic identity (eid) technology, that is, the data is converted to the corresponding hash value, base64 encoding plus version number, user ID and reserved bits and other information. The logo has irreversible characteristics, and different users of the same data XID generalization results are different, even if the data loss will not cause information leakage.n
First, the data vendors de-sensitize their own data through XID generalization and convert it into encrypted data for trading. After the data buyer desensitizes the data to be verified for XID generalization and then according to the data in the order, the seller gives the token Information, convert their own XIDs into identifiable XIDs for the data vendors, and initiate authentication requests to the data vendors. If the data vendors find the matching data, they will return authentication success information, otherwise they will return authentication failure information.n

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“Sample = overall” mechanismn
“Sample = Overall” is the inevitable result of the data sandbox mechanism and also a key link in improving data analysis.n
Traditional data analysis is based on sample estimates, the result of which is limited by the accuracy of the data samples. Through the sandbox mechanism, the SDEP platform allows data analysts to obtain more comprehensive data. From then on, the sample analysis is transformed into full data analysis, which leads to more scientific and accurate conclusions.n
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Data Trading Process Analysisn
A complete transaction process based on blockchain includes the following: Data purchase direction When the data seller requests data, it first verifies the request information, including verifying whether the buyer is an authenticated user, whether the request parameter is valid, and after the authentication is passed, requesting information Will be sent to the data seller; Subsequently, the data seller receives the request and prepares the data and caches the data in the database. The data seller then triggers the smart contract creation transaction and returns the transaction data to the data buyer After the data will trigger the smart contract to complete the transaction, thus, the data to complete a complete circulation.n
See the figure below:n
The above process, in addition to the green part into the chain, the other nothing compared with the traditional data trading system, technically simpler.n
It is important to note that all data transactions are settled in local currency.n

SDEP system is divided into four major modules, namely: basic components, data transaction module, data processing module and external service module.n
The basic components cover the functions of platform management, status monitoring and security protection, and provide support for the stable operation of the entire platform.n
Data Trading related modules include basic user and product information, data quality assessment, transaction process management, data distribution and other transaction aids, covering the main flow of data transactions.n
The blockchain platform of the data processing module is mainly responsible for the transaction accounting and transaction settlement. The big data platform is mainly responsible for the coordination computation of multi-source data and the execution of data quality assessment.n
(The general online exchange is composed of these four modules)n
The following is the official website to provide the project team description:n
1. XCT to solve the problem of asset information data, which is in addition to blockchain technology, more importantly, mathematical modeling. Shawn Lee, chief scientist at XCT, is a visiting scholar at the University of California, Berkeley / Lawrence Berkeley National Laboratory and a Ph.D. in Physics from Tsinghua University’s Institute for Advanced Study. He is an expert in numerical methods and mathematical modeling. b) Its chief technology officer is a former comment system architect for the public. He previously worked as an algorithm research and development engineer for the advertising department of Baidu, and has extensive experience in large-scale distributed system design, big data analysis and processing and mathematical modelingn
2. Investors, consultants strong lineup, strong correlation. Well-known investor Xue Manzi lead vote and as a consultant, former Thunder technical partner, Li Jinbo also as a technical adviser.n
Project website: http://www.xchainstudio.net/n
Official sole community manager: blockchainstudion
Follow-up project development, we will continue to focus.n

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