Can reusing an old Bitcoin address increase future quantum risk?

Yes. Reusing an address after a spend may leave new funds tied to a public key already revealed on-chain.

The answer

Yes. Reusing an address after a spend may leave new funds tied to a public key already revealed on-chain.

What to do next

Generate fresh receive addresses and keep track of old key reuse.

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Sparrow Bitcoin desktop wallet

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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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