Newbie question. AFAIK, each US banknote has a unique serial number. Is the same true for bitcoin? Does each bitcoin have a unique identifier, regardless who owns it? Does each satoshi have a unique identifier?
the main reason why serial number is encoded in most fiat and not just the US dollar is to prevent production of counterfeit money. Since it's a printable currency that people can attempt to manipulate and create something of such kind, the serial number to the best of the knowledge serves as a means of differentiating real government printed money from one that's possibly coming from a wrong source.
Bitcoin is not printed. It's a digital currency which means that you only have it in figures. If I have 0.5
BTC, I can only see it equivalent in dollar and nothing more. They isn't a need for a serial number because you can't create your own Bitcoin just from nowhere. I might not be totally correct but to the best of my knowledge, Bitcoin doesn't have a unique identifier.