It doesn't really work like that. There are no individually recognizable "coins" that you could refer to. Instead, it's more like a digital ledger.

Imagine three people (A, B and C) note down on paper how many bitcoin they have. In the beginning, only A and B have 5 Bitcoin each (the miners). They write down "A has 5 BTC, B has 5 BTC, C has 0 BTC".

Now A sells his 5 Bitcoin to B. They write "A has 0 BTC, B has 10 BTC, C has 0 BTC".

Finally B sells 5 BTC to C. Does C now own the 5 BTC that originally came from A or B? You cannot know, as there's no way to differentiate between them.

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