  Today's world is struggling with the COVID-19 pandemic, as one of the
greatest challenges of the 21st century. During the lockdown caused by this
disease, many financial losses have been inflicted on people and all
industries. One of the fastest ways to save these industries from the COVID-19
is to provide a reliable solution for people's health assessment. In this
article, blockchain technology is used to propose a model which provides and
validates the health certificates for people who travel or present in society.
For this purpose, we take advantage of blockchain features in protecting
people's privacy. Since a variety of antibody and human health proving tests
against the virus are developing, this study tries simultaneously to design an
integrated and secure system to meet the authenticity and accuracy of different
people's health certificates for the companies requiring these certifications.
In this system, on the one hand, there are qualified laboratories that are
responsible for performing standard testing and also providing results to the
system controller. Finally, people are considered as the end-user of the
system. To provide test information for the entities, the mechanism of KYC
tokens will be used based on the Stellar private blockchain network. In this
mechanism, the user will buy a certain amount of KYC tokens from the system
controller. These tokens are charged in the user's wallet, and the user can
send these tokens from his wallet to any destination company, to exchange the
encrypted health certificate information. Finally, considering the appropriate
platform provided by blockchain technology and the requirement of a reliable
and accurate solution for issuing health certificates during the Covid-19
pandemic or any other disease, this article offers a solution to meet the
requirements.
