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"Bitcoin transactions work by sending change back to yourself. For example if you have a wallet with a previous transaction of 1 bitcoin in it and want to send your friend half of that, your bitcoin client creates a new transaction with 2 destinations - 0.5 btc to your friend and 0.5 btc back to yourself. But there is no way to know for sure if a transaction has change in it or not. This website has an algorithm that tries to figure out which amounts are change, it does a decent job but it's still a guess."