Scalability has been one of the most pressing challenges the Ethereum blockchain has faced. Network congestion and high transaction fees have limited mass adoption of this leading platform in smart contracts and decentralized applications. However, in the midst of these challenges, an innovative solution has emerged: zkSync. In this article, we will explore in detail what zkSync is, how it works, and why it has become a key piece in the evolution of Ethereum.
What is zkSync
zkSync, short for “Zero-Knowledge Synchronization,” is a blockchain scalability solution that uses Zero-Knowledge Proof (ZKPs) technology to enable faster and cheaper transactions on the Ethereum blockchain. Developed by Matter Labs, zkSync has become one of the most prominent solutions in the world of blockchain scalability.
How Zero Knowledge Proof works. Source: Medium.
How zkSync works
zkSync is based on a rollup approach, which is a technique that allows transactions or smart contracts to be executed outside the Ethereum main chain, thereby reducing congestion on the main network and improving efficiency. How zkSync works can be broken down into the following steps:
- Initial deposit: Users lock their assets on the Ethereum chain and receive zkERC20 tokens (zkSync compatible tokens) in return.
- Off-chain transactions: Transactions occur outside the main Ethereum chain, meaning operations are carried out quickly and cheaply.
- batch processing: Transactions are grouped and sent to the Ethereum main chain as a single transaction with ZKPs proofs, reducing network load.
- ZKP verification: Before confirming the transaction, zkSync verifies the validity of transactions and account balances using zero-knowledge proofs. This ensures security without revealing sensitive information.
- Status updates on the main chain: Once the validity of transactions is verified, the state of the Ethereum main chain is updated, reflecting the changes made in zkSync.
Differences between a normal layer and the zkSync security layer. Source: Research Gate.
zkSync Key Features
- Scalability: zkSync addresses one of Ethereum's most pressing problems by enabling greater scalability. With the ability to process thousands of transactions per second, zkSync significantly improves network performance.
- Safety: Thanks to zero-knowledge proofs, zkSync offers a high level of security. Transactions and balances are thoroughly verified without compromising user privacy.
- Efficiency: Transactions on zkSync are much cheaper compared to the main Ethereum chain. Users can enjoy lower transaction fees and a faster experience.
- Compatibility: zkSync supports zkERC20 tokens, meaning they can be used in existing decentralized applications (dApps) and smart contracts on Ethereum.
Applications attributable to Zero Knowledge Proof. Source: R3.
Pros and cons of zkSync
Below we list the series of advantages and disadvantages that we can see from the zkSync protocol:
| Pros | Cons |
| Scalability: zkSync solves the congestion problem on Ethereum, allowing for higher throughput and a higher number of transactions per second. | Adoption in progress: Despite its potential, zkSync is still in the process of adoption and expansion, which means its use could be limited compared to other scalability solutions. |
| Safety: The zero-knowledge technology used in zkSync ensures the security and privacy of transactions. | Initial deposit: To use zkSync, users must make an initial deposit in Ethereum, which may be a hurdle for some. |
| Efficiency: Lower transaction fees and faster transactions make zkSync attractive to users and application developers. | |
| Compatibility: Support for zkERC20 tokens makes it easy to integrate into the Ethereum ecosystem. |