Purnama, Suryari, Qurotul Aini, Untung Rahardja, Nuke Puji Lestari Santoso, and Shofiyul Millah. “Design of Educational Learning Management Cloud Process With Blockchain 4.0 Based E-Portfolio”. Journal of Education Technology 5, no. 4 (November 26, 2021): 628–635. Accessed May 1, 2024. https://ejournal.undiksha.ac.id/index.php/JET/article/view/40557.