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Nobel laureate says Bitcoin quantum threat more realistic than thought, calls for preparation

John M. Martinis, a Nobel Prize-winning physicist who led development of Google's quantum computers, has identified Bitcoin as an early realistic target for quantum attacks and urged pre-emptive action. He said a Google paper outlining a scenario in which a quantum computer could crack Bitcoin cryptography within minutes should not be dismissed as hypothetical. Martinis said cryptanalysis could become practical sooner than expected, while Bitcoin upgrades require time and community consensus.