I'm honestly not sure, but I was under the impression that bitcoin wasn't really anonymous. All transactions are publicly logged to prevent double spend, so you

I'm honestly not sure, but I was under the impression that bitcoin wasn't really anonymous. All transactions are publicly logged to prevent double spend, so you can trace a coin from the first time it was used. If you happen to know that an address maps to a specific someone, you can begin to create a pretty identifiable picture. See, eg: https://bitcointalk.org/index.php?topic=241.0 https://bitcointalk.org/index.php?topic=241.0