What would it take to track dollars like bitcoins?

bitcoin.stackexchange.com / December 26, 2013 Watching an ATM from a massive US Bank accept a money deposit tends to make me wonder – what would it take to track dollars like bitcoins? Stated another way, what would a blockchain for fiat money appear like? When I deposit cash into this ATM, it scans each and every banknote. It makes use of Optical Character [...]
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What would it take to track dollars like bitcoins?