Can restoring a hash-based quantum wallet on two devices cause signing-key reuse?

Potentially, if the wallet scheme is stateful and both devices independently spend using the same one-time signing index. The exact risk depends on the design.

The answer

Potentially, if the wallet scheme is stateful and both devices independently spend using the same one-time signing index. The exact risk depends on the design.

What to do next

Follow the wallet developer's state synchronization and backup guidance rather than cloning a live signer casually.

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QRL — Quantum-resistant ledger and 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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