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I know that it's possible to sort through the blockchain history for your bitcoins, however it is difficult to trace back your coins to when they were originally mined due to bitcoin mixers. Is it possible to create a tool that will give a complete history of your coins? More specifically, is it conceivable that at some point regulators may distinguish between "dirty" and "clean" bitcoins, where "dirty" bitcoins are anything that have passed through a wallet of a known criminal? Even with bitcoin mixers?