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Show HN: Temporary QR code to validate physical presence (valid for 5 seconds)
- punnerud 2y agoYou should open on a PC/Mac and scan with your phone. Intended as a prototype to validate that you are physically on a spot when scanning.
- 1oooqooq 2y agoSo i can send one person with a live video call app, and then N person can validate physical presence? :)
- komlan 2y agoThis is the fundamental weakness of every self-check-in system. QR codes are just information, and information can already be transmitted instantly and faked (GPS, etc.) if needed. If you care about reliability, there's no way around scanning the codes yourself (instead of making attendees scan), so you can be sure that each scan maps to an actual attendee, and you're not getting 30 scans from 10 people actually present. I guess self-check-in became popular in zoom calls during the covid area, but people that need reliability instantly prefer the alternative, when available. Shameless self-plug: this is precisely why my Google Forms/Sheets check-in plugin is named "Qr code ticket per attendee" [1], because the unique ID per person is what makes it more reliable than self-check-in. Yes, people can still send friends, but most of the time, you don't care, and it's too much of a hassle for the attendee. People sometimes worry that check-in won't be quick, but QR code reading is very fast [2], and you're only limited by how quick people move. [1] https://qr-code-ticket.com https://qr-code-ticket.com [2] https://www.youtube.com/watch?v=-fkgCX3H7so https://www.youtube.com/watch?v=-fkgCX3H7so