In January 2021, the Indian Health Ministry officially allowed Aadhaar-based authentication when creating a UHID for identification and authentication of beneficiaries for various health IT applications promoted by the Ministry. This enabled the Co-Win portal, which is used to book COVID-19 vaccination appointments, to accept Aadhaar for authentication. As per Clause 2a of Co-Win’s privacy policy, “If you choose to use Aadhaar for vaccination, you may also choose to get a Unique Health ID…