## ZK-Rollup: The key for blockchain to "breathe" in the future?

Blockchain today is struggling with a major issue—slow speeds and high fees. You wait several minutes for a transaction to process, and then the gas fees bite into your wallet. This has caused many people to turn away. But zkrollup—a layer 2 technology—is changing this situation.

## How does ZK-Rollup work?

Instead of processing each transaction on the main blockchain, zkrollup aggregates hundreds of transactions into a single block off-chain and then sends it to the main network. This method reduces the amount of data that needs to be stored on the blockchain by up to 90%, making everything faster and cheaper.

The "zero-knowledge" part in zkrollup is key. It uses zero-knowledge proof (ZKP)—a cryptographic tool that allows you to prove that a transaction is valid **without revealing any details**. Imagine proving you know the password without actually stating it.

## Why is zkrollup important?

**Breathtaking speed:** Transactions are processed off-chain, thus significantly increasing overall throughput—from several hundred transactions per second to thousands.

**Transaction fees drop significantly:** Due to fewer data being recorded on the main blockchain, gas fees will be considerably lower, sometimes only 1% of the fees on the Ethereum mainnet.

**Enhanced security:** ZKP ensures the validity of all transactions without disclosing the details of each individual transaction. This better protects user privacy.

## The challenge is not small

ZK-rollup is not a perfect "miracle." Creating zero-knowledge proofs requires enormous computational power, resulting in very high development costs. Additionally, integrating zkrollup with existing smart contracts on Ethereum still has compatibility issues that need to be addressed.

## Conclusion

Although there are still challenges, zkrollup is gradually becoming the leading solution for the scalability issue of blockchain. Developers and the crypto community users are looking at it with hope—a technology that can make blockchain more practical and accessible.