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              <p>Current blockchain-based reputation solutions forcrowdsourcing fail to tackle the challenge of ensuring bothefficiency and privacy without compromising the scalability ofthe blockchain. Developing an effective, transparent, and privacy-preserving reputation model necessitates on-chain implementa-tion using smart contracts. However, managing task evaluationand reputation updates alongside crowdsourcing transactions on-chain substantially strains system scalability and performance.This paper introduces RollupTheCrowd, a novel blockchain-powered crowdsourcing framework that leverages zkRollups toenhance system scalability while protecting user privacy. Ourframework includes an effective and privacy-preserving repu-tation model that gauges workers’ trustworthiness by assessingtheir crowdsourcing interactions. To alleviate the load on ourblockchain, we employ an off-chain storage scheme, optimizingRollupTheCrowd’s performance. Utilizing smart contracts andzero-knowledge proofs, our Rollup layer achieves a significant20x reduction in gas consumption. To prove the feasibilityof the proposed framework, we developed a proof-of-conceptimplementation using cutting-edge tools. The experimental re-sults presented in this paper demonstrate the effectiveness andscalability of RollupTheCrowd, validating its potential for real-world application scenarios.</p>
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