Quote from: o_e_l_e_o on October 19, 2023, 12:21:38 PM

Am I the only one who uses coin control as the default option? Whenever I want to make a payment, I start by selecting the UTXOs I wish to spend. There are lots of reasons you should do this over automatic selection. Privacy is the biggest one, as has been discussed already. I want to spend specific UTXOs for specific things, and I definitely don't want my wallet automatically consolidating UTXOs I don't want spent together.

Coin control has same limitations depending on the user profile.
I use multiple wallets, the one I'm doing only deposits has no problem with it as I spend the entire output, makes no difference if I want to play around with $200 for a few bets on some Ascot festival or F1 circuit and I deposit $217, on that wallet I can safely control the coins perfectly.

But on my other messy wallet I use to buy cheap small things and pay vps and vpn subs, I end up with so many and so tiny outputs they are unusable, I batched them last week and 3 or 4 of them would have been a loss over 5sat/b Cheesy

That aside I don't understand the privacy thing in this so-called conjoin.
Outputs a1,a2,a3,a4 which are let's suppose known are being consolidated into b1 2b b3, calling b1 a decoy...
How is that different from sending a1,a2,a3,a4 to c1 and then splitting that for payments?

If we assume ax are known everyone can see the trail of the coins, there is no privacy whatsoever, you could have just sent each output a1>b1, a2>b2 and then consolidated those it would have set the same level of privacy, which is approximately zero.

Quote from: Kruw on October 19, 2023, 06:49:55 PM

Isn't coin control obsolete thanks to advancements in coinjoin technology? When I make a transaction, there's no labels necessary because any coins being spent are completely isolated from other transactions I did.

However they aren't at all in your example, there is a simple one tx link between them!

Quote from: Kruw on October 12, 2023, 12:23:48 PM

You are wrong, a mixer is a trusted third party, they do not provide you privacy. The instances of mixers stealing their users confirm this fact, with the end result of having their users' transaction history given to government agencies: https://bitcoinmagazine.com/technical/how-authorities-found-bitfinex-bitcoin

Mixers are not offering some complete secrecy, they are used to break the links, if you're not stupid enough to, quoting from your article:

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Lichtenstein would often open up accounts on bitcoin exchanges with fictitious identities. In one specific case, he allegedly opened eight accounts on a single exchange (Poloniex, according to Ergo), which at first were seemingly unrelated and not trivially linkable. However, all of those accounts shared multiple characteristics that, according to the complaint, gave the couple’s identity away.
First, all of the Poloniex accounts used the same email provider based in India and had “similarly styled” email addresses

The complaint also alleges that Lichtenstein joined multiple bitcoin withdrawals together from different Poloniex accounts into a single Bitcoin wallet cluster, after which he deposited into an account at a bitcoin exchange (Coinbase, according to Ergo), for which he had previously provided know-your-customer (KYC) information

However, the article also mentions:

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There is also no record of using mixing services by the couple, which can’t erase past activity, but can provide good forward-looking privacy if done correctly.

Which is exactly the opposite of your claim!