chain · quantum risk

Is Polygon zkEVM (ETH) Quantum Proof?

Risk: high · Confidence: high · Reviewed: 2026-07-19

Verdict

Polygon zkEVM is not quantum-proof. It is a separate zkEVM deployment from Polygon PoS: classical EOAs plus prover/bridge keys.

Overview

Polygon zkEVM must not be confused with Polygon PoS. User signatures are still classical EVM; ZK validity does not equal PQC wallets.

Inventory bridges specifically labeled zkEVM.

Exposure summary: Distinct from Polygon PoS; separate bridges and EOAs. Signature surfaces: ECDSA-secp256k1 (EVM EOAs); zkEVM prover/bridge keys. Inventory holders, operators, and any bridge/issuer paths before treating ETH as quantum-ready. Educational only.

Cryptographic profile

Signatures: ECDSA-secp256k1 (EVM EOAs), zkEVM prover/bridge keys
Hash: Keccak-256
Public-key exposure: Distinct from Polygon PoS; separate bridges and EOAs.

What breaks

Classical signatures authorizing ETH value under Shor-class adversaries once public keys are known
Custodial hot wallets and exchange operational keys
Bridges, issuers, or operator sets outside ordinary user wallets
Sequencer / prover / upgrade keys on the L2 path

Mitigations

Inventory every key that can move ETH (self-custody, exchange, multisig, protocol roles)
Name the host chain and bridge path for every balance
Document operator/admin sets for L2s and apps
Track ecosystem PQC research; branding is not deployment
Use /assessment and claims methodology pages for program framing

FAQ

Same as /is-quantum-proof/polygon?

No—PoS vs zkEVM are different deployments and key graphs.

Related?

Polygon, Scroll, zkSync, Ethereum.

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