Does using a hardware wallet hide my Ethereum public key from quantum analysis?

Not after the corresponding account has sent a signed Ethereum transaction; hardware storage and on-chain public-key exposure are different.

The answer

Not after the corresponding account has sent a signed Ethereum transaction; hardware storage and on-chain public-key exposure are different.

What to do next

Understand key-exposure history separately from physical key storage.

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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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