What is Bitcoin Core's "Coin Control Features"?
How do I use it, and what can I do with it?
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What is coin control? When you send bitcoins to someone else, the bitcoin client chooses kinda randomly which of your addresses will send the coins. With coin control you can exactly choose, which of your addresses will be the sending addresses. And even more specific which of your unspent outputs will be the sending inputs.
When making a payment, Bitcoin Core will automatically pick an input set to fund the transaction. The Coin Control feature allows the user to perform the input selection manually instead. Explicitly selecting the input set can boost privacy by preventing undesired address linkage and allows simple UTXO management tasks.