So, how does it work? After getting results back from SHL’s laboratory, users can upload them to Zults and share them with others through a web link, QR code, or via Bluetooth. The information is then held on slick digital Zults card, visually akin to a credit card, displaying your name, when you were tested, and for what infections. di Matto hopes it will eliminate the need for awkward — and unverifiable — screenshots.