Blockchain-Based Privacy-Preserving Research Articles

Parking Management: A Blockchain-Based Privacy-Preserving System

In a smart city, smart parking systems generally strive to facilitate the renting of available private parking spaces to vehicle users (just like timesharing). Existing technologies can authenticate and manage parking spaces and vehicles, but they do not address the need to preserve users' privacy. This article presents the framework for a blockchainbased parking-management system designed to preserve the privacy of its users, without relying on a reliable third-party entity. The proposed system integrates BlockChainOpenSource (BCOS) and smart contract technology to share parking spaces.

BPTM: Blockchain-Based Privacy-Preserving Task Matching in Crowdsourcing

Task matching in crowdsourcing is designed to provide convenient task information retrieval and has been extensively explored. In general, the task matching process is required to be reliable and to meet privacy requirements. However, most existing privacy-preserving task matching solutions for crowdsourcing focus on privacy issues but ignore the reliability of the process. In this paper, we propose a blockchain-based task matching scheme for crowdsourcing with a secure and reliable matching. Instead of utilizing a centralized cloud server, we employ smart contracts, an emerging blockchain technology, to provide reliable and transparent matching. In this way, data confidentiality and identity anonymity are achieved effectively and efficiently. The extensive privacy analysis and performance evaluation show that our solution is secure and feasible.

A Blockchain-Based Privacy-Preserving Payment Mechanism for Vehicle-to-Grid Networks

As an integral part of V2G networks, EVs receive electricity from not only the grid but also other EVs and may frequently feed the power back to the grid. Payment records in V2G networks are useful for extracting user behaviors and facilitating decision-making for optimized power supply, scheduling, pricing, and consumption. Sharing payment and user information, however, raises serious privacy concerns in addition to the existing challenge of secure and reliable transaction processing. In this article, we propose a blockchain-based privacy preserving payment mechanism for V2G networks, which enables data sharing while securing sensitive user information. The mechanism introduces a registration and data maintenance process that is based on a blockchain technique, which ensures the anonymity of user payment data while enabling payment auditing by privileged users. Our design is implemented based on Hyperledger to carefully evaluate its feasibility and effectiveness.