With the dust settling from the 'airdrop season' of top projects like zkSync and Starknet, zero-knowledge (ZK) technology has never ignited the community's fervor and controversy as it does today. Millions of users' wallet addresses have, for the first time, formed a tangible connection with this esoteric cryptographic technology. However, amidst the clamor surrounding valuation, trading volume, and airdrop rules, are we falling into a 'winner's myopia'? Are we locking ZK's imagination merely into a single dimension of 'making Ethereum faster and cheaper'?
While the market's focus is still on the fierce competition in the Layer 2 arena, a grander wave—the fusion of AI and Crypto—is quietly rising. ZK is the key technological bridge connecting these two super narratives. This article aims to penetrate the current haze of ZK-Rollups' popularity and present a core viewpoint: the ultimate battlefield of ZK technology is not to win the L2 war, but to build a trustworthy, permissionless digital reality that can defend individual sovereignty for the upcoming AI era.
(Photo from: @ayyyeandy)
ZK-Rollups: A great starting point, not an endpoint
Undoubtedly, ZK-Rollups are the most successful commercialization of zero-knowledge proof technology to date. They solve the scalability issue in the 'impossible triangle' that has troubled the blockchain world for years with an almost perfect cryptographic technique. By bundling hundreds or thousands of transactions off-chain (Layer 2), generating a concise validity proof, and then submitting it to the main chain (Layer 1) for verification, ZK-Rollups have increased Ethereum's transaction processing capacity by several orders of magnitude without sacrificing security.
From StarkWare's StarkNet to Matter Labs' zkSync, and Scroll and Polygon zkEVM, the technical competition among major teams is almost entirely centered around 'EVM compatibility' and 'transaction costs (Gas Fees)'. The market has responded enthusiastically, and capital has invested real money showing its preferences. This has created a prosperity, but also brought about a 'tunnel vision'—we seem to default to the idea that ZK's mission is to make on-chain transaction experiences faster and cheaper.
However, if we broaden our perspective, we will find that limiting ZK technology merely to the framework of scalability underestimates its revolutionary potential. Scalability is a necessary pathway, the infrastructure leading to the future; but it itself is not the future. It paves the way for us, but what truly captivates is the scenery that this road leads to.
Breaking out of the scalability siege: Three high-potential battlefields for ZK
When we no longer view ZK merely as a 'compression tool', its essence as a 'trust tool' comes to light. This reveals three fields that are urgently waiting to explode and are more in line with the spirit of Crypto fundamentalism:
1. Verifiable Computation: Reshaping the Trust Foundation of Data and Computation
Imagine a scenario: A complex machine learning model or a sophisticated financial risk model running on a cloud server, how does it prove to you that its computation process is accurate and has not been maliciously tampered with? In the traditional Web2 architecture, we can only choose to 'trust' the service provider.
ZK technology has completely changed the rules of the game. Through zero-knowledge proofs, the party executing the computational task can generate a proof that certifies it has executed the computation exactly as prescribed and has honestly returned the results. The verifier does not need to re-execute the entire time-consuming computation process; it just needs to verify this lightweight proof to establish mathematical-level trust in the results.
This is not just technical bravado. It will unlock decentralized physical infrastructure networks (DePIN), decentralized science (DeSci), and fairer digital advertising markets. For example, the field of ZKML (Zero-Knowledge Machine Learning) that Modulus Labs is exploring allows the inference process of AI models to be verified, assuring users that the AI-generated results they receive have not been censored or manipulated. Projects like RISC Zero build a universal ZK virtual machine (zkVM), enabling any type of computation to generate ZK proofs, opening the door to decentralized, verifiable cloud computing. When the computation process itself becomes trustworthy and verifiable, we no longer need to rely on centralized brands or institutions as trust intermediaries, making a truly peer-to-peer, permissionless computing market possible.
2. Decentralized Identity (DID) and On-chain Reputation: Build your Web3 native passport
In the current Web3 world, our 'identity' has been brutally simplified to a wallet address. This address records our assets and transaction history, but it cannot carry our complex social relationships, professional achievements, or credit scores.
ZK-DID allows users to selectively prove their attributes without revealing specific personal information. For example:
Proving to a DeFi protocol that your credit score is above a certain threshold to obtain better lending rates without exposing your entire asset status.
Proving you are a real, independent user in DAO governance voting without revealing your identity.
Proving to a gaming platform that you are over 18 years old without showing your ID number.
This ability of 'selective disclosure' is key to building a Web3 ecosystem that can protect user privacy while establishing complex social cooperation. This is not a fantasy; Polygon ID has already built a complete open-source framework for this, allowing developers to easily integrate ZK identity verification features. Projects like zkMe focus on providing decentralized KYC solutions, where users only need to verify once to anonymously prove their compliant identity across the entire Web3 world. Even large-scale social experiments like Worldcoin utilize ZK technology to ensure that users' 'personhood proof' is separated from their on-chain behavior, protecting individual privacy. It will give rise to a native on-chain reputation system, making our digital identity no longer just a cold address, but a rich, three-dimensional 'soul' of our own sovereignty.
3. True On-chain Privacy: From Transparency to 'Controllable Transparency'
The transparency of Ethereum is a double-edged sword. It guarantees the fairness and auditability of the system but also exposes all users' financial situations to the sunlight. Privacy coins (like Zcash) have long demonstrated the power of ZK in transaction privacy, but their ecosystem is relatively isolated.
The future trend is to seamlessly integrate privacy features into mainstream smart contract platforms in either 'optional' or 'default' forms. Imagine enterprises conducting confidential supply chain financial settlements on-chain; DAO organizations distributing salaries anonymously; individual users making private asset transfers.
In this arena, Aztec Network is a pioneer, aiming to bring a native privacy layer to Ethereum by constructing an encrypted ZK-Rollup, allowing users to conduct confidential transactions in familiar DeFi applications. Additionally, Layer 1 public chains like Aleo are designed for privacy from the ground up, aiming to create a smart contract platform that is private by default. This requires us to shift our mindset from pursuing 'complete transparency' to pursuing 'controllable transparency'—that is, data is private by default, but owners can grant view permissions to specific parties (such as auditing institutions) as needed, generating corresponding ZK proofs to confirm compliance. This is the most profound transformation of ZK technology in finance and even social governance.
The success of ZK-Rollups is a tremendous victory for ZK technology on the level of 'instrumental rationality'. It efficiently addresses the industry's most pressing pain points. However, the vast ocean of Crypto ultimately needs to return to the exploration of 'value rationality'—what kind of world do we want to build with these powerful tools?
I firmly believe that the ultimate mission of ZK technology is to grant individuals unprecedented digital sovereignty. It enables us to participate in the digital economy without sacrificing privacy, to verify the authenticity of the information we rely on, and to build a trust internet that is not defined by centralized giants, but rather secured by mathematics and consensus.
Therefore, when we evaluate a ZK project next time, perhaps we can ask higher-dimensional questions: Beyond making transactions faster and cheaper, does it make our digital world more trustworthy? Does it give us greater control over our identity and data? Is it contributing to a future that is fairer and more protective of individuals?
Betting on ZK is not just betting on a technology, but also on a future. And that future is far grander than the TPS and Gas fees we are discussing today.