Putting Bitcoin on Plastic + Improving 0-conf for POS Transactions

An idea I’ve been thinking about for a while. If we put Bitcoin keys on EMV chips, we could integrate with existing POS payment systems all over the globe.

Plus, if only the keys are on the card, plus the ability to sign transactions, the customer would then give the signed transaction for the merchant to push to the blockchain – greatly reducing the risk of double-spends. Because the card is stupid, it would simply lack the ability to double-spend.