The global governments and developers are exploring how certificates and passports could help to reopen economies by identifying those protected against COVID-19.
Here, on the other hand, Bahrain's 'BeAware' app displays a green shield alongside an official certificate detailing the person's name, date of birth, nationality and which vaccine was received.
Users must have received two doses of a vaccine, separated by 21 days, and then wait for two weeks for antibodies to develop, the statement said.
"Authorities can verify its validity by scanning a QR code linking to the national vaccine register," it said. Denmark has said it would launch an initial version of a coronavirus vaccination passport by the end of February.
Sweden also plans to launch a vaccine passport by summer, assuming there is an international standard in place for the document by then, the government said two weeks ago.
Bahrain, a small island state with a population of around 1.5 million, offers citizens and residents free of charge the Pfizer/BioNTech vaccine, one manufactured by Chinese state-backed pharmaceutical giant Sinopharm, the Oxford-AstraZeneca Covid-19 vaccine and Russia's Sputnik V vaccine.
