h a l f b a k e r y
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What it says in the title.
Very small. Can be carried on a keyring. Smaller than an SD card. Numbers laser etched onto surface.
Needs an adapted physical reader (or a "full-size" carrier card, which are Baked) but uses the same software etc.
Also supports NF contactless payments.
||It would be very easy to lose. However, if you opted
instead for the micro-SIM format, you could have the
thing laminated onto one of your incisors, and make
payments simply by biting the reader.
||I would quite like this embedded in a ring, so you press your fist into the card reader.
||The problem would be getting a good connection to the pins for the duration of the transaction. The only viable solution I can see to this is to have the card reader shaped like a gargoyle whose teeth clamp down onto the ring when inserted and only release once the correct pin has been entered.
||Not a gargoyle: a lion's head, like the one in Rome,
where you put your hand in its mouth, and make a
statement, and, if you lie, it bites your hand off: "I
swear there is money in this account to cover the
transaction" "I solemnly attest I am the owner of this
vehicle" ... chomp. "Aieee! call a doctor!"