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Comment by jagger27

3 months ago

The Railcard website you linked is pretty clear.

> For those aged 16-25, save 1/3 off rail fares for days out, seeing family and friends and even festivals!

> For those aged 60 and over, save 1/3 off rail fares for days out, holidays, seeing family and friends, and theatre trips!

So, provide proof of age via ID and get a discount. It's very common on public transit for the young and elderly to get a discount.

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jagger27

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incompatible  3 months ago

and the 26-30 Railcard, and the Children aged 5 to 15, and the for those aged 16 or 17, it just seems weird to have all these age-restricted options for exactly the same product (a seat on a train.)

  • jagger27  3 months ago

    Call it woke or socialism, but perhaps it's within a society's interest to make travel affordable for people who don't necessarily have access to other modes of transit. It's the difference between equality and equity.

    • incompatible  3 months ago

      I'm not sure that age is the biggest factor in wealth inequality. I could be wrong, but there are plenty of rich kids and poor middle aged.

trollbridge  3 months ago

Proper ZK off of that would be it would simply provide which of those age ranges you're in, not your actual date of birth.

  • hedora  3 months ago

    Yeah, but what if the company has 36,500 age based discount tiers (or has heard of binary search)?

    I don’t see how revealing the result of a less than comparison can be considered zero knowledge, but then I also don’t understand the difference between Google exchanging actionable confidential facts about you for money and them selling your personal information, so what do I know?

    • trollbridge  3 months ago

      Well, a compromise would be to simply provide the user's age in years, as opposed to their date of birth. Effectively a 365-day resolution instead of 1-day.

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