Are any bitcoins (or other coins) worth more than others based on their history? Eg is a silk road BTC worth more than a freshly mined BTC?
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The question makes no sense. "Bitcoins" do not retain identities as they move from address to address and mingle.
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There's an argument that bitcoins are not fungible due to their encoded tx histories. I'm curious if there's any empirical evidence of this
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He's saying there's no such thing as a "bitcoin", singular. It's continuous - if I send you 1 BTC, and you already have 1.5, you now have 2.5. You then spend .2....which "bitcoin" did you spend? Coins are not cardinal, therefore no history is possible per coin
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Yup. At best you can track balances at addresses. Here and I made one visualization based on blocks


