Understanding UTXO Selection in Bitcoin Core

Been digging into how Bitcoin Core picks UTXOs for transactions. Can anyone break down what algorithm it uses to prioritize UTXOs? Trying to figure out how to save on fees and avoid dust outputs.

Check this out, it might help. The actual code for UTXO selection is in the repo. Look at the comments in the code, they pretty much explain everything you need to know.

You can enable coin control in the settings. It lets you pick which inputs to use when sending transactions. I prefer doing it myself. Also, consolidating small inputs can really save you cash on fees later.

I’m all for Bitcoin Core too, especially with the Coin Control feature. Just select the coins you wanna use. It’s crazy how some folks send transactions without this privacy is a must, and controlling UTXOs is key.

You don’t need Bitcoin Core just for coin control, other wallets like Electrum have it too. And sometimes the default UTXO selection isn’t the cheapest. Using coin control lets you send smaller, cheaper transactions.

Yo, Bitcoin Core is cool coz it handles change addresses smartly. If you send to a legacy address, your change address will also be legacy. Helps with privacy automatically.

Not the only one doing that. Mycelium has a Privacy Guard feature for change addresses. Armory also tries to match output types if set to Auto-change, tho it’s a bit different.

Coin control is a must now. If your wallet doesn’t have it by 2025, ditch it. Bitcoin Core isn’t special because of that. Its main feature is being a full node, validating everything yourself.

Yeah, Mycelium used to be my favorite on Android. I remember it supports multiple address scripts. Coinomi does too, but I’m not sure how it handles change addresses.

Kinda off topic, but Armory is still being developed, just really slowly. One dev is mainly keeping it going. Check out their GitHub for the latest updates.