Are Ethereum L2 deposits automatically quantum-safe because they use smart contracts?

No. A rollup may depend on its own proofs, sequencer keys, bridge contracts and Ethereum account signatures.

The answer

No. A rollup may depend on its own proofs, sequencer keys, bridge contracts and Ethereum account signatures.

What to do next

Assess the full protocol stack, not only the bridge contract.

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Trezor hardware wallet

A current-generation hardware wallet for managing keys; it does not make Bitcoin or Ethereum quantum-resistant or resolve a future protocol migration.

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