Simkojn – offline verifiable currency using simcards (sloev.github.io)

When thinking about offline currency and simcards we identified the following:

verifiable centrally issued identifier printed on card and can be verified by inserting into any phone

coin-like small physical tokens

offline verification processes could be as simple as a distributed poster with whitelisted id's

distributed and decentralized bootstrapping based on trust in accepted id's.

really? i see it as clipart (think word clipart), so just some tacky fill for the eyes :-)

Meanwhile, here in South Africa, our intrepid criminals are making their own simcards, by the bucketload..

https://www.citizen.co.za/sandton-chronicle/news-headlines/l...

For fun - Put that phrase in Google. "No chill in Mzanzi"

As you know this is imho a cool idea. I'm thinking, what hinders the barista in usecase 1 from using the received simkojn in the cash register?

Isn't some sort of removal of cards from the list necessary?

Maybe I'm missing something...