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Uppercase “B”, lowercase “b”, or “BTC”. Which one is it already?

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Uppercase “B” is for Bitcoin (proper noun) – the payment network technology in its entirety.

Lowercase “b” is for bitcoin(s) (common noun) – the currency unit(s) traded over the Bitcoin network.

“BTC” is the abbreviation for the bitcoin currency. An analogy is USD, for United States dollar.