Nostr Web Client

In the video, 2 utxos were combined into 4 utxos. If I send all 4 together, won't that reveal common ownership and the coinjoin was for nothing? Or does it still make sense because there were so many different inputs to the coinjoin that it's still difficult to determine where they came from even if sent together afterwards? Trying to understand that

Kruw 2y ago

Sending all 4 UTXOs together is the least private way to spend them since that would give a clue indicating the total amount you registered for that round, but it would not be fully effective since there are many input combinations that add up to that amount. Spending the private UTXOs individually or remixing them before sending your entire balance is the best way to handle them.

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Discussion

Toshi 2y ago

OK. Thank you. That's the way I understand it. But then consolidating 2 UTXOs in a coinjoin and getting 4 back isn't really consolidation, is it? The point of consolidation is to have fewer UTXOs after than before, because I want to save on fees when fees are high. No?

Kruw 2y ago

You can consolidate more than 2 inputs in each coinjoin round (up to 30 in BTCPay Server's implementation), but yes, you will receive multiple outputs to hide the amount.

Toshi 2y ago

Ah okay. That makes more sense. If I have 10 UTXOs I could consolidate them and then maybe get 5 out of it. Got it