IonQ CEO predicts Q-Day will arrive in 2028, putting Bitcoin encryption in the crosshairs

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IonQ CEO Peter Chapman predicted that “Q-Day”—when quantum computers can break widely used cryptography—could arrive as early as 2028. The warning places Bitcoin’s elliptic-curve signatures, particularly exposed public keys, in the potential crosshairs, although current quantum systems cannot yet threaten the network. If the timeline proves credible, Bitcoin would need to adopt and deploy quantum-resistant signatures well before capable machines emerge.

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