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Publish Time:2019-02-20 09:28:44

Project name: Line Chain (XING) Locating Chain

Project website:

On-line price: 0.05CNY

Coin-punching time: 2019.2.21

Transaction time: 2019.2.22

Contract address: 0x0636baa 073246fe71c924ec6da1f13fa82a05dcc

Project Profile: The traditional way to prove location is to tell the server the location of an ID with a clear identity on the map directly (APP obtains data by using the API of the map service provider). The way to prove the location of the line chain is to let the nodes with random movement around verify coordinates, store the parameters in block chains, and then perform the actual business according to the intelligent contract, so that there is no data. Users who need to expose their ID have clear identity information. In short: the line chain hopes to replace self-map labeling with block chain consensus algorithm to prove where people are. From declaring where you are to collectively certifying where you are. At present, there is no visual mapping component for location proof of embedded block chain intelligent contracts, nor established standards for generating embedded location or spatial coordinates. Intelligent contracts can not add trigger conditions based on location agreement. Civil GPS signals are not encrypted and vulnerable to hijacking and fraud. It is not convincing to rely solely on declarative location confirmation. Moreover, GPS signals are vulnerable to occlusion by ground buildings, resulting in satellite lock-out, multi-path signal offset and other issues, while in large indoors, GPS positioning can not be relied on at all.

In this paper, we propose a solution: a block chain transaction is sent by a third party, and the spatial location data of the sender and the receiver are added to the transaction. The transaction will embed the data into the block and synchronize it to each node, so as to ensure the real and effective data, so it can be used in the calculation of intelligent contracts. In refining, the location data is pushed into the block chain by a third party, and the authenticity of the data is verified by consensus mechanism in advance. In order to adapt to complex spatial conditions, a hybrid positioning method with multiple mobile phone positioning methods is implemented to acquire data. Line chain will realize data state transmission between intelligent contracts and cross-links by building the most important embedded module - line predictor, and provide a variety of encryption proof methods represented by POL algorithm to build a trusted environment. Simply put, the line predictor is the state processor and compiler of spatial data, which realizes that the data state on the third-party chain can represent the data state outside the chain.