GOOD old-fashioned cash is to go down the electronic route, now that it is possible to stamp simple electronic circuits directly onto banknotes. Modern banknotes contain up to 50 anti-counterfeiting features, but adding electronic circuits programmed to confirm the note's authenticity is perhaps the ultimate deterrent, and would also help to simplify banknote tracking. Silicon-based electronic circuits are clearly too thick to be incorporated into thin and fragile banknotes, but semiconducting organic molecules might be a viable alternative.
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