

Bitcoins aren’t really discrete individual units like that. Imagine you send me 0.1 bitcoin and my mom sends me 0.1 bitcoin and I then send 0.1 bitcoin to Alice (ignore transaction fees and such). It’s not really a meaningful question whether the sum Alice received was the fraction of a “coin” I received from you, from my mom or some specific mixture of both. The blockchain just records increases and decreases of a wallet’s balance.
Programming by hallucination