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Every time I blip my metro card, I want a transparent dashboard where that metro card went. I am the only who knows my unique metro card id, so I type in my id and password (encryption) So if someone steals it, I know where the guy is using it, and I can also freeze it. This gives me the power to track my asset, and I can decide what to do with it.
Key is to separate the value from the card and be able to freeze the card. They are just starting to get around to the former here in NYC
baltsar replied:
Cool. I can freeze my metro card here in Stockholm as long as I am registering this card with the company running the metro (SL). Now they know where ever I go and who I am. Which is wrong if I am concerned with privacy