Rahardja U, Hidayanto AN, Putra POH, Hardini M. Immutable Ubiquitous Digital Certificate Authentication Using Blockchain Protocol. JART [Internet]. 2021 Aug. 24 [cited 2024 May 2];19(4):308-21. Available from: https://jart.icat.unam.mx/index.php/jart/article/view/1046