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Olympus has three possible types of users: Data Subjects, Data Processors and Data Controllers and a fourth participant, Supervisor Authority, that, despite not being an explicit role, can perform all verifications that GDPR mandates. We conclude that it is possible to create a system that overcomes the major challenges of storing personal data in a blockchain (Right to be Forgotten and Right to Rectification), while maintaining its desirable characteristics (auditability, verifiability, tamper resistance, distributed\u2014remove single points of failure) and complying with GDPR.<\/jats:p>","DOI":"10.1007\/s10207-023-00782-z","type":"journal-article","created":{"date-parts":[[2023,11,17]],"date-time":"2023-11-17T19:02:53Z","timestamp":1700247773000},"page":"1021-1036","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":11,"title":["Olympus: a GDPR compliant blockchain system"],"prefix":"10.1007","volume":"23","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0760-6270","authenticated-orcid":false,"given":"Ricardo Martins","family":"Gon\u00e7alves","sequence":"first","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0489-4465","authenticated-orcid":false,"given":"Miguel Mira","family":"da Silva","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2701-5248","authenticated-orcid":false,"given":"Paulo Rupino","family":"da Cunha","sequence":"additional","affiliation":[]}],"member":"297","published-online":{"date-parts":[[2023,11,17]]},"reference":[{"key":"782_CR1","doi-asserted-by":"publisher","unstructured":"Vasylkovskyi, V., Guerreiro, S., Sequeira, J.S.: Blockrobot: increasing privacy in human robot interaction by using blockchain. 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