I would recommend checking out a whole host privacy projects. Many are bunk, but some, particularly zero knowledge by default, are where it's at. Monero definitely has the largest market for privacy coins. People actually spend it, however it is not as private as people believe. It obfuscates data rather than encrypt it. 11current decoys, not much. Its going to be upped to 100 soon but even that is not much.
Definitely check out pirate chain and darkfi as well
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Although I agree with you about sender privacy being relatively weaker than it's other tech - this is not completely true, Ven
Amounts and receivers on Monero *are* encrypted and completely hidden. They're not merely obfuscated.
The only thing obfuscated is spenders. So the most you could theoretically know is someone spent Monero. Not *how much* or to *whom* it was sent. Also, minor thing but, current decoys are at 15+1 real. Meaning after one hop from a transaction the chance of randomly guessing a spender is already less than a percent (~0.4%)
I definitely am looking forward to full-chain membership proofs to address this, but it is not as dire as it is sometimes made to seem at this moment in time
Thank you for clarifying!
I think of this quote from Fluffy Pony
https://twitter.com/fluffypony/status/1052095452651376640
Mimble wimble, while it scales better, is not private at all, and zcashs implementation of optional zksnarks created vulnerabilities for the whole chain ,shielded and unshielded.
While people dont like the trusted setup procesa, it was well documented, and the implementation of Zksnarks by default on all transactions by pirate chain was ideal. Darkfi is inplementing halo2 trustless zk, with smart contracts and merge mining with monero randomX
I recommend checking out amir taaki's comments on various privacy coins, while he is fond of the monero community he is vocal about the need to improve its privacy