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RE: I got $5,000 Scammed Last Night - Problems with the Modern Banking System by Charlie Shrem
True story. A cool idea is a secured credit card, secured by Bitcoin or a credit card that its bills can be paid in Bitcoin.
The problem is this requires a bank to exercise credit powers. But it would be handy.
It would be cool if there was some way to invalidate crypto transactions using a premade revocation that generates after each transaction, that cancels the transaction and specifies a backup address.