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Cash
Not exactly what I asked for, but yes.
It's the only one. There is no way to send digital payments that is privacy focused.
Except for crypto, and then only if you put in a lot of effort to make it so.
Is this correct though, in terms of a confidentiality or non-repudiation guarantee? For a ledger system -- blockchain or not -- every unit can be traced back through the history, to one or more sources. Yes, multiple transactions can serve to obfuscate the sources, but the real source is within that subset of all possible sources. So unless obfuscation takes place by involving all possible addresses, there's still going to be some amount of knowledge revealed about the relationship of some source and some destination address.
But I think non-repudiation could be more damaging in a cryptocurrency context. Imagine a corrupt politician that takes a cash bribe. Unless the briber recorded the serial numbers, the politician can plausible repudiate any connection with the briber, because the cash could have come from anywhere else.
Whereas with cryptocurrency, if the briber's wallet address is ever revealed (eg. by hack, by change of heart, by blackmail, or by cryptographic collapse), then there's a line which can connect the briber to the politician. They cannot deny that it's possible to have received the bribe, which is a scandal unto itself. Probably not good enough to convict of a crime, but enough to do political damage.
Ultimately, I'm of the opinion that a ledger system still isn't as strong on confidentiality as cash, because cash records nothing at all, so there's nothing to accidentally reveal. To be clear, bribery is a stand-in for any sort of payment that would cause adverse effects if revealed. Other examples include secret child support, for a secret pregnancy, for a secret abortion, or anything else that people don't want to reveal to the world. The whole point of privacy, I maintain, is to have a choice on what other people get to know.
Monero is untraceable because it uses zero-knowledge proofs and ring signatures. The identity of neither party is known to the other, nor can the amount sent be seen by any outside party.
Monero
You'd be surprised how public your crypto transactions are
Edit: After looking more deeply into Monero, I gotta say, they are doing something that gets about as close as you can get. Good for them, and thanks for bringing this up.
"about as close as you can" = literally untraceable lol
Monero is legit. The technology is fucking impressive.
It's not literally untraceable (unless you mean figuritively literally) it's just effectively untraceable.
Also important to note that your transaction is essentially as private as you are, which assume that the user is taking precautions to not broadcast to the world what website they are going to and at what time and for what. So obviously the biggest flaw is still user behavior (using a sketchy exchange, using the same Monero wallet for multiple transactions, connecting your Monero wallet to another non-private wallet, and leaking metadata outside of the block chain are all things that can and do happen and make this not literally untraceable.
But yes, it gets about as close as you can.
https://www.trmlabs.com/resources/blog/the-rise-of-monero-traceability-challenges-and-research-review
Monero, the crypto, is untraceable. Any user error is unrelated to that.
You can use the same Monero wallet as many times as you want. I'm not sure where you got this idea that you can't use the same wallet more than once, but it's simply not true.
I honestly don't know what you are even talking about? There are no "non-private" Monero wallets. It's not possible. And how does one "leak metadata outside of the [Monero] blockchain"?
Interesting link. Hmm you know, let me look up who this "TRM Labs" company actually is...
Oh wait that's weird, they seem to be directly aligned with the goals of the Trump administration. Huh.
Just a coincidence that you used them as your source I'm sure. I'm certain you have other sources corroborating those claims and have no problem posting them here.
Heyheyhey, I'm not fighting with you here. You use Monero or not, I'm going to be sticking with cash and trade.
Not trying to fight, I was just struck by how wrong you were that's all.
I didn't even say that I use it.
If you use the same wallet for multiple transactions, you create a forensically-discocerable trail. It doesn't give any information in and of itself, but can be used to determine frequency of use, which can be used to trace you. This is, like very basic opsec, just in terms of what you should and shouldn't trust. That's what I'm saying here, and you're missing it because you want to defend a coin that you
?
Monero uses stealth addresses that cannot be linked back to a wallet. They are generated new with each transaction.
Here, read the answer here for a better explanation: https://monero.stackexchange.com/questions/13285/using-multiple-wallets-for-anonimity
I suggest you do some research before saying things with such certainty
Edit: here you know what I'll just paste it here:
The "cannot be decrypted easily" is this person hedging as it's literally never been done.