I know that Bitcoin accounts are public private keys combination.

Is it the same with the currency? Is one Bitcoin a combination of public pvt key? Or is it a token?

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A bitcoin, as defined in the whitepaper, is a chain of digital signatures. "To own 1 bitcoin" is by definition equivalent to the following: "in the history of transactions, as defined by the heaviest blockchain branch originating from the genesis block, there exist unspent transaction outputs that sum up to 1 bitcoin such that you have the private key(s) required to spend them".

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