Arya Raditya Prawira Putra, Dendi, Yudha Purwanto, and Marisa Paryasto. “The IMPLEMENTATION OF BLOCKCHAIN AS COVID-19 TEST AND VACCINE CERTIFICATE STORAGE SYSTEM”. [CEPAT] Journal of Computer Engineering: Progress, Application and Technology 1, no. 02 (August 30, 2022): 7–15. Accessed August 3, 2025. https://journals.telkomuniversity.ac.id/cepat/article/view/5189.