  Travel has been challenging recently since different nations have implemented
varied immigration and travel policies. For the time being, immigration
officials want proof of each person's immunity to the virus. A vaccine passport
serves as evidence that a person has tested negative for or is immune to a
particular virus. In terms of COVID-19, those who hold a vaccine passport will
be permitted entry into other nations as long as they can provide proof that
they have COVID-19 antibodies from prior infections or from full COVID-19
immunizations. To reduce time and effort spent managing data, the vaccination
passport system has been digitalized. The process of contact tracing may be
facilitated by digitization. The "Blockchain technology" system, which is
currently in use, has demonstrated its security and privacy in systems for data
exchange among bitcoin users. The Digital Vaccination Passport scheme can use
Blockchain technology. The end result would be a decentralized, traceable,
transparent, reliable, auditable, secure, and trustworthy solution based on the
Ethereum block-chain that would allow tracking of vaccines given and the
history of diseases.
