Blockchain Based Data Sharing Key Technologies Research And System Implementation

With the development of Internet of Things,big data and artificial intelligence technology,the value of data has been paid more and more attention.This paper aims to establish a distributed data sharing system using blockchain technology,which makes data flow and aggregation as well as protect users' privacy and rights.This paper has done research on blockchain technology for data sharing scenarios and has completed the following work.1)Design and implement a blockchain-based decentralized data trading platform PDash,including a storage system compatible with any types of cloud storage,a smart contract for processing transaction logic and disputes,a wallet for managing data and encryption keys,a proxy network for content distribution,and a market for aggregation of data information Besides PDash supports real time stream data trading for IoT scenery Trading on PDash will not reveal any private information without any trusted third parties2)Develop a blockchain-based and proxy-assisted data transfer protocol OTP,and optimize it for IoT applications.Besides we apply OTP protocol to PDash data transaction3)Based on the existing public blockchain,we realize private transaction that only for specific group of node.We further design a new data trading mechanism based on private transaction which brings a higher level of privacy to PDash.