@MyHero 2 April 2021 more from that month

NEWS : South Korea to issue blockchain-protected digital 'vaccine passports "Prime Minister Chung Sye-kyun said a mobile app, which will allow international travellers to show digital proof of vaccination and adding the app uses blockchain technology to prevent counterfeit." Link : https://www.reuters.com/article/us-health-coronavirus-southkorea-idUSKBN2BO43W