This is the same problem as with “plausible deniability” idiot-bait: The real world does not work this way! In the real world, if an investigator gets a 90% probability, or even a 10% probability linking transactions, then that is what is called an “investigative lead” to be pursued and confirmed with other evidence. Or maybe just used in other ways, if someone who wants to get you just isn’t too picky about “proof”.
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Most Internet-armchair security “experts” have no fucking idea how detectives actually work. Evidence does NOT need to be “proof” to be very, very useful.
Wasabi Wallet does Payjoin! This is separate from, and additional to, their CoinJoin implementation.
JoinMarket also does Payjoin:
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That last point is important; and it applies to Payjoin, too. If a significant number of people were to use Payjoin and CoinSwap, Chainalysis would be sad because their heuristics would become generally unreliable. Mass-surveillance would be more difficult, and fungibility would be improved. It would not be perfect—far from it—but this is a huge step in the right direction!
I understand everything you are saying. It would be a good idea to have a good attorney too, who can muddle up all those 10% findings.
I've been watching CoinJoin when it was some thread titled "Taint me rich" or something.
On the one hand, if you're a target, you are a target, and there is little you can do about any other surveillance they set up on you or tracking or whatever. You're screwed no matter what, unless you "ghost" and just disappear completely. (or at least, your transactions just disappear, the easiest way is to just stop for right now.)
But if you're not yet a target, you can hide or blend with the crowd and never be singled out in the first place.
So ideally, all those payjoins, coinjoins, coinswaps ... as well as using multiple exchanges, preferably the decentralized ones, swapping from one coin to an alt and then back (if needed) or using that alt to do your transactions... you get the picture. (or you don't, which implies no one else does.)
What a lot of people forget, is that in the real world, there is "real" security... sometimes known as physical security. You get aware of this if you've served any amount of time in the police or military forces, or you just plain like your 2nd amendment (for those folks in the USA) and carry daily.
I come from a country (the Philippines) that does not have it as a right in our constitution, but more so a right as an individual that we have practiced to keep since many other nations have tried to invade or colonize us over the centuries. I just treat everything as NPE (non permissive environment).