Hello everyone, in the world of Web3, there is a brutally counterintuitive truth — your assets are even more transparent than in traditional banks. As long as someone knows your wallet address, all your transaction records, asset balances, and even what chain games you have played will be exposed in this "dark forest."
For many years, on-chain privacy technology has been stuck in a "dead end": on one hand, the underlying cryptographic technology has yet to meet commercial standards; on the other hand, regulators, wearing colored glasses, view all privacy tools on the market as "infrastructure for hacker money laundering."
However, in the past year, the winds have changed. Technological breakthroughs have overcome bottlenecks, and a truly compliant and usable **'full-stack privacy technology architecture'** is quietly taking shape in the ecological gaps of Ethereum.
Today, we will deeply analyze this privacy moat that is about to reshape the infrastructure of Web3.
I. Shielded Pools: Compliant Public Mixers
Currently, the most mature privacy layer component in production is called **'Shielded Pools'**.
💡 【In Simple Terms】 Shielded Pools vs. Zero-Knowledge Proofs (ZKP): Imagine a gigantic 'public piggy bank'. Zhang San, Li Si, and Wang Wu all threw in 100 yuan (deposits). When Zhang San wants to withdraw money, he does not need to prove to the whole network 'I am Zhang San'. He only needs to submit a **'Zero-Knowledge Proof (ZKP)'** to the system — it's like an encrypted note that says: 'I swear by mathematical laws that I have indeed deposited 100 yuan in this jar, but I will never tell you who I am.' The verification node reads the note and confirms the mathematical logic is correct, and then allows the withdrawal. The flow of funds in and out is completely cut off at the boundary of this 'public piggy bank'.
The strength of privacy depends on 'the crowd'. If there are only 10 people in the pool, data analysis companies can easily guess who you are based on time differences; but if there are millions of deposits in the pool, such tracking becomes almost impossible mathematically. The Railgun protocol in the Ethereum ecosystem has safely processed transaction volumes of up to 4.5 billion dollars using this mechanism.
So, how do we address the regulatory scrutiny of 'Anti-Money Laundering (AML)'?
The latest technological evolution has introduced **'Privacy Pools Association Sets'**. The system maintains an audited 'clean funds whitelist'. When you withdraw money, you can use cryptographic proof that your money 'belongs to this clean whitelist set'** without exposing your specific identity. This perfectly achieves: auditable by regulators, and absolute privacy for the public.
II. The Holy Grail of Cryptography: Fully Homomorphic Encryption (FHE)
While shielded pools cut off the flow of funds, privacy can still be leaked when you execute complex smart contract operations on-chain. At this point, the ultimate holy grail of cryptography — Fully Homomorphic Encryption (FHE) — needs to be introduced.
💡 【In Simple Terms】 Fully Homomorphic Encryption (FHE): Imagine you need an accountant to help you calculate, but you don't want him to know how much money you actually have. So, you lock the financial data in an extremely sturdy black box and give it to him. The accountant wears a 'magic glove', directly reaches into the black box to feel around and operate the abacus, and comes up with the result. Then he hands the still-locked black box back to you. Throughout the process, the accountant completed his work, but he knows nothing about the numbers inside the box. In Web3, FHE allows smart contracts to directly compute 'data in encrypted state', and no validation nodes across the network can see the underlying real amounts.
At the end of last year, the well-known cryptography team Zama successfully deployed the first commercial-level FHE on Ethereum. They not only achieved the transfer of confidential stablecoins but even conducted a 'sealed-bid Dutch auction' — all bids were absolutely confidential, even the system administrator could not see them.
The Puzzle Assembly: The blind spot of FHE is that it can only hide 'transaction amounts (the money in the black box)', but it cannot hide 'who handed the black box to whom (transaction graph)'. Therefore, when FHE (hiding amounts) is combined with shielded pools (hiding trajectories), Web3 truly possesses a perfect privacy architecture.
III. The Deadly 'Opt-In' Dilemma
The technology is in place, so why isn't everyone using it? This touches on the biggest pain point in the privacy track: the **Opt-In** dilemma.
Currently, the default settings of mainstream public chains are 'fully transparent and naked'. If users want privacy, they must click a few more times to actively deposit money into shielded pools. However, this creates an extremely contradictory vicious cycle:
Because of the cumbersome operation, only a very small number of people (even including those with ulterior motives) will use it.
A very small number of people using it leads to a very small scale of 'public piggy banks (anonymous pools)'.
If the scale is too small, it fails to confuse the audience, resulting in weak privacy protection.
Weak privacy protection further discourages people from using it.
Why not enforce full anonymity across the network? The long-established privacy coin Monero is fully anonymous across the network. What was the outcome? Due to its inability to meet compliance requirements, it faced joint delisting from major global exchanges and was even directly banned by the EU's (Anti-Money Laundering regulations). The cost of 'forced privacy' is the complete loss of access for traditional institutional capital like Wall Street.
This explains why mainstream public chains like Ethereum would rather sacrifice a bit of privacy experience to maintain the bottom line of 'default transparency with optional privacy'.
IV. Ethereum's Ultimate Counterattack: The Kohaku Project Rewrites Default Rules
Faced with the deadlock of 'no one uses it without compulsion, but if compelled, it gets banned', the Ethereum Foundation proposed an extremely clever solution: instead of manipulating the public chain layer, play stealthily at the 'wallet layer'.
By the end of 2025, the Ethereum Foundation officially launched the Kohaku project. This super toolkit (SDK) for global wallet developers directly integrates three major privacy tools into the underlying logic of wallets:
Underlying Silent Shielding: Every ordinary transfer you make will automatically be shielded and sent through the Railgun protocol in the background, and you won't even feel the difference.
Personalized Accounts (Account Isolation): When you connect to different DApps (like Uniswap and Aave), Kohaku automatically generates different virtual accounts for you in the background. This completely cuts off the possibility of big data companies cross-tracking your real identity through multiple applications.
P2P Network Broadcasting: Bypass centralized node service providers and hide your physical IP address.
Web3 wallets built on Kohaku will no longer pop up asking you 'Do you need privacy?' but will make privacy a 'default factory setting' like breathing.
Conclusion and Outlook:
Can the Kohaku project completely end the 'naked running era' of Web3? It is still too early to draw conclusions. The launch of the toolkit does not equate to universal adoption; it requires follow-up from top wallet teams and needs to go through the painful period of accumulating funds in the underlying anonymous pools.
But we have already seen the clearest dawn: Indestructible cryptography (FHE) has been proven feasible, compliant whitelisting mechanisms (Privacy Pools) have gone live, and Ethereum, the world's largest developer ecosystem, is pushing to integrate privacy into wallets for every household.
In the second half of Web3, those who can protect users' privacy will win the next billion-level incremental market.
⚠️ 【Disclaimer】 The content of this article is only for the purpose of business model analysis and technical knowledge sharing; all data comes from the internet. It does not constitute any investment or operational advice, nor does it bear responsibility for the authenticity of the data. Please conduct independent research and make cautious decisions.
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