TrustGrid Pty announced a new use case for its platform to provide citizens with a secure digital vaccine passport that can be stored on their smartphone. TrustGrid? has been used for the last five years by the Australian state government to secure a digital driver’s license ecosystem. Designed using distributed ledger technology, TrustGrid is an opt-in system where citizens can authenticate their identity and vaccination status and receive a QR code to show as proof of vaccination.