Polygon zkEVM
Polygon's ZK Rollup EVM-compatible chain offering Ethereum-level security with significantly lower transaction costs.
Polygon zkEVM — Polygon zkEVM is a zero-knowledge rollup that provides EVM-equivalent execution with validity proofs posted to Ethereum mainnet. Unlike Polygon PoS (a sidechain), zkEVM inherits Ethereum's security directly by generating cryptographic proofs that verify all transactions are valid. It offers lower costs than Ethereum with stronger security guarantees than sidechains.
What Is Polygon zkEVM?
Polygon zkEVM is a Type 2 zero-knowledge EVM rollup, meaning it can execute standard Ethereum bytecode while generating zero-knowledge proofs of correctness. Transactions execute on Polygon zkEVM, and a cryptographic proof is posted to Ethereum that mathematically guarantees all state transitions are valid — no challenge period required.
This approach combines the low cost of off-chain execution with the security of Ethereum's consensus, without the 7-day withdrawal delay of optimistic rollups.
zkEVM Technology
Generating ZK proofs for arbitrary EVM execution is one of the hardest problems in blockchain engineering. Polygon zkEVM uses a custom prover that converts EVM traces into arithmetic circuits and generates succinct proofs. These proofs are verified by a smart contract on Ethereum mainnet, confirming that thousands of transactions were executed correctly.
zkEVM vs Polygon PoS
Polygon PoS relies on its own validators and periodic checkpointing. Polygon zkEVM derives security directly from Ethereum via validity proofs. zkEVM has higher per-transaction costs than PoS but offers stronger security and faster finality to Ethereum. Both chains coexist in the Polygon ecosystem, serving different use cases.
Related Terms
Polygon PoS
Polygon's original Proof of Stake sidechain to Ethereum; rebranded to POL in 2024 as part of the Polygon 2.0 upgrade.
Read definition Chain-SpecificEthereum Mainnet
The primary Ethereum blockchain where all real-value transactions occur, as distinct from testnets like Sepolia or Goerli.
Read definition Chain-SpecificBase (L2)
Coinbase's Ethereum L2 built on the OP Stack, launched 2023; known for low fees and Coinbase ecosystem integration.
Read definition Chain-SpecificOP Stack
The open-source development framework from Optimism used to build Ethereum L2 blockchains; powers Base, Optimism, and others.
Read definitionFrequently Asked Questions
Common questions about Polygon zkEVM in cryptocurrency and DeFi.
Optimistic rollups (Arbitrum, Base) assume transactions are valid and allow a 7-day challenge period. zkEVM proves every transaction is valid using zero-knowledge proofs — no waiting period needed. The trade-off is that ZK proof generation is computationally expensive.
Nearly. As a Type 2 zkEVM, it supports most Ethereum opcodes and tooling. Some edge cases — such as certain precompiles and gas metering details — may differ slightly. Most Solidity contracts deploy without modification.
ZK proofs provide mathematical certainty that transactions are valid, enabling instant finality on L1 without a 7-day challenge period. This means faster withdrawals to Ethereum and stronger security guarantees.
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