I recently sent some BTC from my Coinbase account to a Blockchain.info wallet, but the numbers I see are confusing. According to my Blockchain app, the transaction had a fee of .0001 BTC (for the miners, I get that). The BTC made it to my wallet, but the remaining .00120821 went somewhere else. Because of this, I wonder where did the .00120821 BTC get sent?
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possible duplicate of How does change work in a bitcoin transaction?– Murch ♦Commented Dec 21, 2015 at 22:27
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All I got from that was a generalization of "change."– user31364Commented Dec 21, 2015 at 22:37
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Sorry, actually, this one is probably a better match: Why are there two transaction outputs when sending to one address?– Murch ♦Commented Dec 21, 2015 at 22:42
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Hey @doffing81, I put in a redaction request on both the original question and original answer to make them the same as this latest edit in the edit history.– Murch ♦Commented May 13, 2020 at 15:23
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1 Answer
Unspent transaction output (UTXO) can only be spent in full, so if they don't match the amount you are trying to send exactly the rest will be sent back to yourself.
Therefore I assume that you had a single UTXO in your wallet. When it was spent, the remainder was sent to a change address in your own wallet.