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However, blockchain\u2010based crowdsourcing systems still endure the issues of privacy and security. Participants\u2019 sensitive information (e.g., identity, address, and expertise) have the risk of privacy disclosure. Sensitive crowdsourcing tasks such as location\u2010based data collection and labeling images including faces also need privacy\u2010preserving. Moreover, current work fails to balance the anonymity and public auditing of workers. In this paper, we present a secure blockchain\u2010based crowdsourcing framework with fine\u2010grained worker selection, named <jats:italic>PrivCrowd<\/jats:italic> which exploits a functional encryption scheme to protect the data privacy of tasks and to select workers by matching the attributes. In <jats:italic>PrivCrowd<\/jats:italic>, 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 <jats:italic>PrivCrowd<\/jats:italic>.<\/jats:p>","DOI":"10.1155\/2021\/3758782","type":"journal-article","created":{"date-parts":[[2021,8,1]],"date-time":"2021-08-01T12:20:09Z","timestamp":1627820409000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["PrivCrowd: A Secure Blockchain\u2010Based Crowdsourcing Framework with Fine\u2010Grained Worker Selection"],"prefix":"10.1155","volume":"2021","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3059-1900","authenticated-orcid":false,"given":"Qiliang","family":"Yang","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8099-9704","authenticated-orcid":false,"given":"Tao","family":"Wang","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8465-5332","authenticated-orcid":false,"given":"Wenbo","family":"Zhang","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0419-1209","authenticated-orcid":false,"given":"Bo","family":"Yang","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0667-077X","authenticated-orcid":false,"given":"Yong","family":"Yu","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1815-0328","authenticated-orcid":false,"given":"Haiyu","family":"Li","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0538-5988","authenticated-orcid":false,"given":"Jingyi","family":"Wang","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Zirui","family":"Qiao","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2021,8]]},"reference":[{"volume-title":"The Rise of Crowdsourcing","year":"2006","author":"Howe J.","key":"e_1_2_12_1_2"},{"key":"e_1_2_12_2_2","doi-asserted-by":"publisher","DOI":"10.1109\/TCC.2018.2799219"},{"key":"e_1_2_12_3_2","doi-asserted-by":"publisher","DOI":"10.1109\/tsc.2017.2773604"},{"key":"e_1_2_12_4_2","doi-asserted-by":"crossref","unstructured":"ZhangS. 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