the one thing I like most about #nostr are the podcast-friendly URLs
https://cdn.nostr.build/i/3b564c0790f98d71f6d7796b1d829eac41e0ffe21fc48130d31c872ca2146683.jpg
And very easy to give someone. Okay, with a QR-Code anything can be transferred, not just your vaccine status, but also your vcard or anything.