The gig poster problem, solved
Music discovery happens in places where typing is impossible: a dark venue, a flyer handed over at a show, a sticker on a lamp post, a merch table with a queue. A QR code is the only realistic way to convert those moments, and it's why they've become standard on posters and demo packaging.
Point it at your profile rather than one track. A release code is dead the week after the release; a profile code keeps sending people to whatever you've put out most recently, which is what you want on a sticker that might sit on a laptop for two years.
Print big and print dark. Posters are scanned from a few steps away, which means the code needs to be a decent fraction of the sheet — as a rough rule, about a tenth of the distance people will stand from it — and high-contrast, because venue lighting is rarely on your side.
Everything happens in your browser. The QR encoder is built into this page, so your username is never sent to a server, nothing is logged, and there's no daily limit. The code is static — the link lives in the pattern itself, with no redirect service in the middle that can expire, start charging or go down.