{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T01:49:45Z","timestamp":1760147385947,"version":"build-2065373602"},"reference-count":31,"publisher":"MDPI AG","issue":"2","license":[{"start":{"date-parts":[[2023,1,30]],"date-time":"2023-01-30T00:00:00Z","timestamp":1675036800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Information"],"abstract":"<jats:p>The Internet of Medical Things (IoMT) uses wireless networks to help patients to communicate with healthcare professionals. Therefore, IoMT devices suffer from a lack of security controls, just like many Internet of Things (IoT) gadgets. Thus, in this paper, we develop a system that uses a blockchain to secure medical data for each transaction between physicians and patients. This system also helps the physician to send the treatment to the blockchain. The blockchain creates a new block for the treatment and connects it with the previous block. This system also helps patients to access their treatment through the blockchain. SHA-256 is used to hash the new block using some information about the last block. We modify SHA-256 using the LZ4 algorithm to compress data. We also prevent a new block hash code starting with a specific number of zeros, which made the proposed system give a time complexity better than all related work. In this paper, we also develop a party-authentication technique that ensures the two parties of the transaction. The proposed system makes a transaction with O(n) time complexity. Thus, our system takes 1 s to create a block for the transaction. We also make a green computing algorithm comparison between our proposed system and the blockchain version. This comparison proves that our proposed method consumes less energy to create a new block. This paper proves that our method performs better than all previous blockchain versions.<\/jats:p>","DOI":"10.3390\/info14020080","type":"journal-article","created":{"date-parts":[[2023,1,31]],"date-time":"2023-01-31T02:04:52Z","timestamp":1675130692000},"page":"80","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Secure Medical Blockchain Model"],"prefix":"10.3390","volume":"14","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-3622-2740","authenticated-orcid":false,"given":"Ibrahim Shawky","family":"Farahat","sequence":"first","affiliation":[{"name":"Faculty of Computers and Information, Mansoura University, Mansoura 35516, Egypt"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Waleed","family":"Aladrousy","sequence":"additional","affiliation":[{"name":"Faculty of Computers and Information, Mansoura University, Mansoura 35516, Egypt"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6347-8368","authenticated-orcid":false,"given":"Mohamed","family":"Elhoseny","sequence":"additional","affiliation":[{"name":"Faculty of Computers and Information, Mansoura University, Mansoura 35516, Egypt"},{"name":"College of Computing and Informatics, University of Sharjah, Sharjah 272722, United Arab Emirates"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Samir","family":"Elmougy","sequence":"additional","affiliation":[{"name":"Faculty of Computers and Information, Mansoura University, Mansoura 35516, Egypt"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ahmed Elsaid","family":"Tolba","sequence":"additional","affiliation":[{"name":"Faculty of Computers and Information, Mansoura University, Mansoura 35516, Egypt"},{"name":"The Higher Institute of Engineering and Automotive Technology and Energy, New Heliopolis 11829, Egypt"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2023,1,30]]},"reference":[{"key":"ref_1","unstructured":"Lopes, A.R., Dias, A.S., and S\u00e1-Moura, B. 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