Key Takeaways
ZKsync is a Layer 2 scaling solution for Ethereum that uses zero-knowledge rollups (zk-rollups) to process transactions faster and at lower cost than the Ethereum mainnet.
ZKsync uses zero-knowledge proofs (ZKPs) to verify transaction batches, enabling faster settlement than optimistic rollups, which require a 7-day challenge window.
The ZK Stack allows developers to build independent blockchains (ZK Chains) that connect into a unified Elastic Network, sharing liquidity and interoperability without relying on external bridges.
Introduction
Scalability is one of the central challenges in blockchain development. As more users and applications compete for block space on Ethereum, transaction throughput falls and gas fees rise. ZKsync addresses this by processing transactions off the Ethereum mainnet and submitting compressed, verified proofs back to the chain, reducing both cost and confirmation time for users.
What Is ZKsync?
ZKsync is a Layer 2 scaling solution built on Ethereum. It uses zk-rollups to bundle multiple transactions together, process them off the Ethereum mainnet, and submit a single cryptographic proof of their validity back to the chain. The result is higher transaction throughput at significantly lower cost compared to transacting directly on Ethereum.
ZKsync was developed by Matter Labs. It currently operates two main environments: ZKsync Era, the main EVM-compatible rollup, and the ZK Stack, a modular framework for building custom blockchains.
How Does ZKsync Work?
Step 1: Aggregating transactions
ZKsync collects and bundles pending transactions into batches using zk-rollups. Rather than submitting each transaction individually to Ethereum, bundling them together reduces the per-transaction cost of mainnet interaction significantly.
Step 2: Generating zero-knowledge proofs
For each batch of transactions, ZKsync generates a zero-knowledge proof (ZKP). A ZKP is a cryptographic method of proving that a set of statements is true without revealing the underlying data. In this context, it verifies that all transactions in a batch are valid without re-executing each one individually on the mainnet.
Step 3: Submitting proofs to Ethereum
The generated ZKP is submitted to the Ethereum mainnet, where it is verified by a smart contract. Once the proof is accepted, the transactions are considered finalized and recorded on the Ethereum chain. This mechanism allows ZKsync to inherit the security properties of Ethereum while greatly increasing transaction capacity.
ZK Stack and the Elastic Network
Beyond the ZKsync Era, Matter Labs developed the ZK Stack: an open-source modular framework that allows developers and organizations to deploy their own independent blockchains, called ZK Chains, using the same zero-knowledge proof technology.
ZK Chains built with the ZK Stack can connect to each other through the Elastic Network, forming a system of interoperable chains that share liquidity and can communicate natively without relying on external bridges. By early 2026, more than 19 ZK Chains were live or in development. The institutional layer has seen notable adoption, with UBS testing tokenized gold, Deutsche Bank building on the infrastructure, and WonderFi (with 1.7 million users) launching its own ZK Chain.
ZKsync also leads the Layer 2 ecosystem in real-world asset (RWA) tokenization, with approximately $2.26 billion in represented RWA value by early 2026, placing it second only to the Ethereum mainnet among all networks.
The ZK Token
The ZK token is the native governance token of the ZKsync protocol. Holders can participate in governance by delegating their voting power to a ZKsync address (which can be their own or another community member's). The delegate votes on governance proposals using the voting weight assigned to that address.
Governance proposals are submitted through the ZkProtocolGovernor smart contract, with a minimum threshold of 21 million ZK tokens required to propose. Approved proposals go through a 3-day delay before a 7-day voting period opens. As of 2025-2026, governance is actively considering proposals that would link ZK token value directly to network fee accrual and staking rewards.
The ZK token was listed on Binance with the Seed Tag applied on June 17, 2024.
ZK Token Airdrop
In June 2024, ZKsync distributed 17.5% of the total ZK token supply through an airdrop to eligible wallets. Allocations were split between usage-based recipients (active ZKsync Era users who met on-chain activity criteria) and contribution-based recipients (developers, native project contributors, and on-chain communities).
The allocation formula used a time-weighted average balance methodology, with DeFi protocol positions weighted at 2x their nominal value. The airdrop was followed by a second distribution in early 2025 through the ZKsync Ignite program, which allocated 325 million ZK tokens to DeFi protocols including Uniswap, SyncSwap, and Aave to incentivize liquidity growth on ZKsync Era. The original claim window for the June 2024 airdrop is closed.
ZKsync Lite
ZKsync Lite, the original v1.0 rollup launched before ZKsync Era, is scheduled to permanently shut down on May 4, 2026. Approximately $33.9 million in bridged assets remain on the network; these funds are safe and can be claimed after the shutdown. Users still holding assets on ZKsync Lite should migrate to ZKsync Era before this date.
ZKsync vs. Optimistic Rollups
Security mechanism
Optimistic rollups such as Optimism and Arbitrum assume transactions are valid by default and rely on human validators to identify and report fraudulent transactions within a challenge window. ZKsync uses ZKPs to mathematically verify each batch of transactions, removing the reliance on human actors for security.
Settlement time
Optimistic rollups have a 7-day challenge period before transactions are fully finalized. ZKsync's use of ZKPs allows transactions to be finalized as soon as the proof is verified on Ethereum, without any challenge window. This results in faster withdrawal and settlement times.
Benefits of ZKsync
Scalability: By processing transactions off-chain in batches, ZKsync significantly increases the number of transactions Ethereum can support per second while reducing per-transaction gas fees.
Ethereum Virtual Machine (EVM) compatibility: ZKsync Era is EVM-compatible, meaning developers can deploy existing smart contracts on ZKsync Era with minimal modification. This reduces friction for DeFi protocols and other DApps migrating from the Ethereum mainnet.
Security through cryptography: ZKPs provide transaction finality based on mathematical proofs rather than social or economic incentives, which reduces the surface area for certain types of attacks compared to optimistic systems.
Ecosystem scale: By early 2026, ZKsync Era hosted 273+ active dApps, had processed 455 million transactions, and served nearly 10 million unique addresses. Its leadership in RWA tokenization and institutional adoption reflects growing demand for enterprise-grade Layer 2 infrastructure.
Is ZKsync Safe?
ZKsync inherits Ethereum's security by submitting zero-knowledge proofs to the mainnet for verification. Transactions are only finalized after their proof is accepted on Ethereum. As with any smart contract system, protocol-level bugs remain a risk. ZKsync's codebase has undergone formal verification by Nethermind, and the team patched a wstETH bridge vulnerability in early 2026 as part of ongoing security maintenance.
ZKsync vs. Optimism or Arbitrum
The primary difference is the proof mechanism. Optimism and Arbitrum are optimistic rollups that assume validity and rely on a 7-day challenge period for fraud detection. ZKsync generates cryptographic proofs for every batch of transactions, enabling near-instant finality without a challenge window.
Closing Thoughts
ZKsync represents a significant step forward in Ethereum scalability by combining the security of the mainnet with the efficiency of zero-knowledge rollups. Its ability to deliver faster settlement, lower costs, and cryptographic finality positions it as a compelling alternative to optimistic rollups, while the ZK Stack and Elastic Network expand its vision beyond a single Layer 2 into a broader ecosystem of interconnected chains.
Further Reading
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