According to CoinDesk, technicians building blockchain-based self-sovereign identity (SSI) tools are collaborating to develop an "immunity passport" to help effectively prevent new crown viruses without compromising user privacy. propagation. More than 60 organizations in the SSI field are involved, including Evernym, Streetcred, esatus, TNO, Georgetown University, etc. The "passport" will be used as a personal certificate to show the user's various statuses, including having been successfully treated, tested positive for antibodies, or received vaccination, etc. These digital certificates will be issued by medical institutions, but controlled by users and in a peer-to-peer manner shared.