Blockchain in Healthcare: A Decentralized Platform for Digital Health Passport of COVID-19 Based on Vaccination and Immunity Certificates[J] HEALTHCARE 2022(10) Razzaq, Abdul Mohsan, Syed Agha Hassnain Ghayyur, Shahbaz Ahmed Khan Al-Kahtani, Nouf Alkahtani, Hend Khalid Mostafa, Samih M.
