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Splitting a transaction and sending some of the coins back to the sender. Necessary for some currencies due to the design of the protocol.
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How to find the change / sender address given a txid?
In addition, never assume that a certain output is the change address. The user could be doing anything (like sending the rest to someone else). … The only ways to do this are:
Try to guess the change address. If there are two outputs you could use the one that isn't yours. …