{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,29]],"date-time":"2026-05-29T18:15:04Z","timestamp":1780078504405,"version":"3.54.0"},"reference-count":130,"publisher":"MDPI AG","issue":"8","license":[{"start":{"date-parts":[[2018,8,6]],"date-time":"2018-08-06T00:00:00Z","timestamp":1533513600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>The Internet of Things (IoT) refers to the interconnection of smart devices to collect data and make intelligent decisions. However, a lack of intrinsic security measures makes IoT vulnerable to privacy and security threats. With its \u201csecurity by design,\u201d Blockchain (BC) can help in addressing major security requirements in IoT. BC capabilities like immutability, transparency, auditability, data encryption and operational resilience can help solve most architectural shortcomings of IoT. This article presents a comprehensive survey on BC and IoT integration. The objective of this paper is to analyze the current research trends on the usage of BC-related approaches and technologies in an IoT context. This paper presents the following novelties, with respect to related work: (i) it covers different application domains, organizing the available literature according to this categorization, (ii) it introduces two usage patterns, i.e., device manipulation and data management (open marketplace solution), and (iii) it reports on the development level of some of the presented solutions. We also analyze the main challenges faced by the research community in the smooth integration of BC and IoT, and point out the main open issues and future research directions. Last but not least, we also present a survey about novel uses of BC in the machine economy.<\/jats:p>","DOI":"10.3390\/s18082575","type":"journal-article","created":{"date-parts":[[2018,8,7]],"date-time":"2018-08-07T03:44:18Z","timestamp":1533613458000},"page":"2575","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":632,"title":["Blockchain and IoT Integration: A Systematic Survey"],"prefix":"10.3390","volume":"18","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-7312-6163","authenticated-orcid":false,"given":"Alfonso","family":"Panarello","sequence":"first","affiliation":[{"name":"Department of Engineering, Universita\u2019 degli Studi di Messina, Contrada di Dio, S. Agata, 98166 Messina, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7860-8572","authenticated-orcid":false,"given":"Nachiket","family":"Tapas","sequence":"additional","affiliation":[{"name":"Department of Engineering, Universita\u2019 degli Studi di Messina, Contrada di Dio, S. Agata, 98166 Messina, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1469-7860","authenticated-orcid":false,"given":"Giovanni","family":"Merlino","sequence":"additional","affiliation":[{"name":"Department of Engineering, Universita\u2019 degli Studi di Messina, Contrada di Dio, S. Agata, 98166 Messina, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6299-140X","authenticated-orcid":false,"given":"Francesco","family":"Longo","sequence":"additional","affiliation":[{"name":"Department of Engineering, Universita\u2019 degli Studi di Messina, Contrada di Dio, S. Agata, 98166 Messina, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0385-2711","authenticated-orcid":false,"given":"Antonio","family":"Puliafito","sequence":"additional","affiliation":[{"name":"Department of Engineering, Universita\u2019 degli Studi di Messina, Contrada di Dio, S. Agata, 98166 Messina, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2018,8,6]]},"reference":[{"key":"ref_1","unstructured":"Newsroom, G. (2018, March 30). Gartner Says Worldwide IoT Security Spending Will Reach $1.5 Billion in 2018. 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