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A comment on The tiny chip that powers Montreal subway tickets. Parent comment
Some of those downsides are positives (immutable, easily copied) others aren’t accurate, for example here’s the Mumbai metro in 2023 with qr entry gates https://youtube.com/shorts/TxbEgEzY9J8?si=s3gE-7_xbCbDoQ1d
Or that a 100% available central ledger is needed (it’s not).
That Qr code systems are in use today in some of the busiest locations would probably be the most succinct counterpoint though.
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Some of those downsides are positives (immutable, easily copied) others aren’t accurate, for example here’s the Mumbai metro in 2023 with qr entry gates https://youtube.com/shorts/TxbEgEzY9J8?si=s3gE-7_xbCbDoQ1d
Or that a 100% available central ledger is needed (it’s not).
That Qr code systems are in use today in some of the busiest locations would probably be the most succinct counterpoint though.