Swedish start-up Dsruptive Subdermals has created a microchip that can be implanted into the skin and display the user's COVID-19 vaccination passport when scanned. When the grain-sized implant, measuring two millimetres by 16 millimetres, is scanned with a smartphone, one's COVID-19 vaccination details and test results can be viewed in the form of a PDF. The implant costs 100 euros.