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Comment by kjkjadksj | Hacker News Reader

Stuff like this should always have an analog failsafe like a printable ticket. I can’t be the only one who has a phone actually die out and about. Especially as this device gets a little old, battery drops maybe 1% every 2 min of screen on use. Even worse in crowded cell service situations like baseball games.

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Also a good fallback if your phone screen cracked 2 hours before. But I can imagine part of the challenge they are facing here are scalpers. TicketMaster app 'rotates' the actual ticket every 30 seconds. Can't rotate paper.

I'd think that having a 2nd factor like presenting ID that matches the ticket would be sufficient there though.

You don’t need the app itself to get the rotating tickets, the algorithm is pretty dumb and was reverse engineered back in 2024. https://news.ycombinator.com/item?id=40906148

You probably still need a device of some kind though.

Ticket counterfeiting is the core problem that they are trying to prevent. If there's a fallback method then that fallback method can be abused to forge tickets.

EDIT: I know complaining about downvotes is a downvotable offense itself, but I'm genuinely curious as to what is objectionable about this comment.

China's solution: your passport is your ticket. Not great for privacy, but persumably you also want to check that people banned from a stadium for their behaviour don't get in anyway.

It's very elegant.

The first time we traveled domestically in China I kept thinking that my wife had to be mistaken, there has to be some kind of confirmation we need to show in order to board. But nope, it literally is just show up with your ID.

Forgery isn't relevant.

He's a known individual, a season ticket holder. He's not some random dude showing up with a paper ticket.

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