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Understanding what zk is - 9 Zero Knowledge projects will "explode" in 2025
In the context where personal data becomes a valuable resource, the question “zk là gì” is drawing increasing attention from the technology and finance communities. Zero Knowledge (ZK), or zero-knowledge proofs, is advanced cryptography technology that allows one party to prove to another that they know certain information without disclosing that information. It is an optimal solution to the problem of privacy protection on the Blockchain—a platform that is inherently transparent but vulnerable to information being compromised.
What Is Zero Knowledge (ZK)? A New Security Solution for Blockchain
When we ask “zk là gì,” we are talking about a unique encryption method that enables information to be authenticated without revealing the nature of that information. In other words, the prover can convince the verifier that they possess “knowledge” about something without disclosing what that specific “knowledge” is.
To make it easier to picture, imagine you have a password to open a secret door. You want to prove to others that you know this password without saying what it is. Zero Knowledge lets you do that—by carrying out a series of actions to prove your ability to open the door (that is, you have “knowledge” of the password) without revealing the password itself.
The three core properties of any valid ZK protocol include: (1) Completeness — if the information provided is correct, the verifier will always be convinced; (2) Soundness — if the information is incorrect, the verifier will almost never be convinced; (3) Zero-knowledge — the verifier will not obtain any other information besides knowing whether the prover has “knowledge.”
How ZK Technology Works — Example “Alibaba’s Cave”
To understand what zk is in practice, the classic example “Alibaba’s Cave” will help us:
Imagine a round cave with two entrances (A and B) and a secret door in the middle. The prover (P) knows the magic spell to open the door, while the verifier (V) wants P to prove that P truly knows the magic spell.
The process is as follows: V stands outside the cave. P enters from a random entrance (A or B). V asks P to come out from the other entrance. P uses the magic spell (if needed) and exits from the entrance V requests. Repeat the process many times.
If P truly knows the magic spell, P will always exit from the correct entrance. If P doesn’t know, the probability is only 50%. After many repetitions, V will believe that P knows the magic spell—without needing to know what it is.
ZK-SNARKs vs ZK-STARKs — Two Distinct Technology Branches
Today, there are two main types of Zero Knowledge Proofs widely applied in Blockchain:
ZK-SNARKs (Zero-Knowledge Succinct Non-Interactive Arguments of Knowledge) are non-interactive proofs. The prover only needs to send a single proof to the verifier. ZK-SNARKs have the advantage of small, efficient proof sizes and easy verification, but they require an initial “trusted setup.”
ZK-STARKs (Zero-Knowledge Scalable Transparent Arguments of Knowledge) are transparent proofs that do not require a “trusted setup.” ZK-STARKs have better scalability and greater transparency; however, they have larger proof sizes and require a more complex verification process.
Practical Applications of ZK in Blockchain and DeFi
ZK technology has broad application potential:
Privacy protection: Users can carry out transactions without revealing personal information or transaction details.
Scaling Blockchain capacity: ZK is used to build zk-Rollups, offloading the main network, increasing transaction processing speed, and reducing fees.
Identity verification: Allows verification of identity without disclosing sensitive information, ensuring safety and security.
Electronic voting: Creates secure, transparent, and tamper-resistant voting systems that prevent fraud.
Supply chain management: Tracks and verifies a product’s origin in a transparent way, ensuring authenticity.
Decentralized finance (DeFi): Creates secure DeFi protocols that enable financial activities without worrying about information security risks.
Top 9 Zero Knowledge projects that will lead the 2025 trend
1. Mina Protocol (MINA) — “Ultra-light” Blockchain
Description: Mina Protocol is a “lightweight” Blockchain with a fixed size, using ZK-SNARKs to compress the entire Blockchain history into a small, compact proof.
Market statistics (updated 29/03/2026):
Assessment: Has significant potential in building lightweight Blockchain applications—secure, with high scalability.
2. Zcash (ZEC) — Privacy pioneer
Description: Zcash is a privacy-focused cryptocurrency that uses ZK-SNARKs to make transactions anonymous.
Market statistics (updated 29/03/2026):
Assessment: A pioneer in applying ZK to cryptocurrencies, with a strong focus on privacy and transaction security.
3. Loopring (LRC) — Efficient DEX Layer-2
Description: Loopring is a decentralized layer-2 exchange protocol that uses ZK-Rollups to speed up transactions and reduce fees.
Market statistics (updated 29/03/2026):
Assessment: An effective scaling solution for DEX, delivering fast transaction experiences and cost savings.
4. Polygon (MATIC) — Versatile Layer-2 platform
Description: Polygon is a scaling solution for Ethereum, supporting multiple layer-2 technologies including ZK-Rollups.
Assessment: A diverse scaling platform that supports many layer-2 solutions, helping address Ethereum’s scaling challenge.
5. Immutable X (IMX) — NFT Layer-2 platform
Description: Immutable X is an NFT layer-2 platform that uses ZK-Rollups to provide free and instant NFT transactions.
Market statistics (updated 29/03/2026):
Assessment: A promising NFT platform that solves issues like high gas fees and slow transaction speeds.
6. dYdX (DYDX) — Decentralized derivatives exchange
Description: dYdX is a decentralized derivatives exchange that uses ZK-Rollups to provide leveraged trading at high speed.
Market statistics (updated 29/03/2026):
Assessment: A leading decentralized derivatives trading platform, leveraging ZK-Rollups to improve performance.
7. Scroll (SCR) — EVM-compatible ZK-Rollup
Description: Scroll is an EVM-compatible zk-Rollup, focusing on providing scalability for Ethereum.
Market statistics (updated 29/03/2026):
Assessment: A highly promising scaling solution, focused on EVM compatibility.
8. zkSync (ZK) — Flexible scalability platform
Description: zkSync is a scaling solution for Ethereum, using ZK-Rollups to increase speed and reduce transaction fees.
Market statistics (updated 29/03/2026):
Assessment: A flexible scalability platform supporting a wide range of DeFi applications.
9. StarkWare — Company developing ZK-STARKs technology
Description: StarkWare is the company behind ZK-STARKs technology, developing scaling solutions for Ethereum and other Blockchains.
Assessment: Plays an important role in developing and applying ZK-STARKs technology, helping drive the growth of the Blockchain ecosystem.
Summary: The Future of Zero Knowledge in the Blockchain Ecosystem
When exploring “zk là gì,” we realize this is a breakthrough technology with great potential for privacy protection, scaling, and improving performance for Blockchain. The development of Zero Knowledge projects such as Mina Protocol, Zcash, Loopring, Polygon, Immutable X, dYdX, Scroll, zkSync, and StarkWare is helping shape the future of the Blockchain ecosystem—moving toward a safer, more transparent, and more efficient digital world.
Investors should conduct thorough independent research before making any investment decision, because market data is always changing.