"In order to enable digital identity at scale, we will need to identify and leverage many entry points. Immunization service delivery presents a tremendous opportunity to provide children with a durable, portable and secure digital identity early in life, enabling access to a wider range of social services, while also improving access to the health interventions all children need and deserve."

https://medium.com/id2020/immunization-an-entry-point-for-digital-identity-ea37d9c3b77e