A vaccine passport could be the next innovation to emerge during COVID-19's reign. A group of companies including Microsoft, Oracle, insurer Cigna Corp and Mayo Clinic have formed a coalition named Vaccination Credential Initiative. It will provide a digital wallet to store encrypted and verifiable vaccination details. This week, Canadian PM Justin Trudeau told a Reuters Next Conference he's against making a vaccine passport compulsory. The EU is debating it. But if people can use it to travel, shop and entertain freely they may embrace it. Governments may adopt it, in a bid to get their economy back on track. Privacy is the main sticking point.