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A comment on The tiny chip that powers Montreal subway tickets. Parent comment

Re:The tiny chip that powers Montreal subway tickets by jszymborski on Monday June 24, 2024 @12:08AM (#40772593)
My understanding is that the STM (runs the Métro) likes to keep fares on the actual paper tickets or rechargeable card, rather than in some central database.

The paper tickets can hold many fares, including unlimited evening fares or two day fares. I believe this would be hard to pull off with QR codes without having to keep track centrally.

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Re:The tiny chip that powers Montreal subway tickets by kevincox on Monday June 24, 2024 @06:54AM (#40774489)
Unlimited fares should be extra easy with a QR code. Just put a signed expiration date.

If course duplication is probably a bigger risk for these tickets as they case be simply locked to one use server side.

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