Mastercard, in partnership with GAVI West Africa, is developing COVI-PASS, a health passport for persons who have been vaccinated against COVID-19. The organisations had previously partnered in providing children's vaccination programmes in West Africa, where Truststamp's evergreen hash technology was employed to uniquely identify children. According to a Mastercard release, the hash is a token ID which keeps details of children without revealing their personal details. Mintpress reports that the health passport is already being implemented in 15 African countries.