Frankfurt Airport is using the IOTA DAG (Direct Acyclic Graph) to securely and privately verify the COVID-19 results of passengers.

COVID-19 is set to continue causing disruptions to our lives for the best part of this year, or potentially longer. Fortunately, technologies are emerging which are hastening the return to some form of normality.

Spending long periods under “stay-at-home” restrictions has many people craving for some extended time outside their four...