The findings suggest attackers could one day steal bitcoin mid-transaction, challenging assumptions that the threat is decades away. Google researchers say breaking Bitcoin and Ethereum’s cryptography may require fewer than 500,000 physical qubits and roughly 1,200–1,450 high-quality qubits for practical attacks, far below earlier estimates in the millions. The paper warns that real-time quantum attacks could hijack in-flight Bitcoin transactions in about nine minutes, potentially beating confi…
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