PrivCrowd: A Secure Blockchain‐Based Crowdsourcing Framework with Fine‐Grained Worker Selection

Abstract

Blockchain-based crowdsourcing systems can mitigate some known limitations of the centralized crowdsourcing platform, such as single point of failure and Sybil attacks. However, blockchain-based crowdsourcing systems still endure the issues of privacy and security. Participants’ sensitive information (e.g., identity, address, and expertise) have the risk of privacy disclosure. Sensitive crowdsourcing tasks such as location-based data collection and labeling images including faces also need privacy-preserving. Moreover, current work fails to balance the anonymity and public auditing of workers. In this paper, we present a secure blockchain-based crowdsourcing framework with fine-grained worker selection, named PrivCrowd which exploits a functional encryption scheme to protect the data privacy of tasks and to select workers by matching the attributes. In PrivCrowd, requesters and workers can achieve both exchange and evaluation fairness by calling smart contracts. Solutions collection also can be done in a secure, sound, and noninteractive way. Experiment results show the feasibility, usability, and efficiency of PrivCrowd.

A Blockchain-Based Crowdsourcing Loan Platform for Funding Higher Education in Developing Countries

“…The result of a comparison between our work and that of other systems, based on the measurements examined, is displayed in Table I. From Table I, it can be observed that integrity and concussion were not achieved in [23], [24] and [25], whereas our proposed system achieves all the metrics that were considered.…”

Integration of Blockchain and Digital Twins in the Smart Built Environment Adopting Disruptive Technologies—A Systematic Review

“…This concept has recently gained plenty of traction within the industry and is gradually becoming adapted to conventional industries such as real estate, artwork, and equities [42]. Tokenization can, for instance, provide a bedrock for monetizing the capacity of idle items on peer-to-peer networks to make the most of assets through blockchain-based crowdsourcing, which has been discussed as a promising approach to overcoming the deficiencies of traditional centralized crowdsourcing systems, such as Sybil attacks and single point of failure [43,44]. As a decentralized alternative to obtaining project funding, blockchain-based crowdsourcing offers advantages such as opening doors for talented individuals in economically underdeveloped countries, obviating the need for intermediaries, and codifying agreements with auditable terms to support fair contract executions [45,46].…”

ExCrowd: A Blockchain Framework for Exploration-Based Crowdsourcing

“…Figures 12 and 13 illustrate a comparison of the proposed system in terms of registration time and processing overhead with three existing ones, namely PrivCrowd: A Secure Blockchain-Based Crowdsourcing Framework with Fine-Grained Worker Selection [40], CrowdR-FBC: A Distributed Fog-Blockchains for Mobile Crowdsourcing Reputation Management [41] and An Incentive and Reputation Mechanism Based on Blockchain for Crowd Sensing Network [35]. For starters, the proposed system is analyzed for its typical registration times.…”