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?
No, real bitcoin does not have a unique identifier even at the unit level, unlike the FIAT we have. I call it here real bitcoin because there are fake bitcoins, i refer to ordinals, there they have a unique identifier from the inscription made, i don't really understand how that mechanism works, but that's what i read from the Investopedia article which discusses ordinals
[1].
[1]
https://www.investopedia.com/what-are-bitcoin-ordinals-7486436