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Google's Quantum AI team published research in March 2026 showing that Bitcoin's elliptic-curve cryptography could theoretically be broken with fewer than 500,000 physical qubits. Bitcoin Improvement Proposal 360 was merged into Bitcoin's code repository in February 2026, introducing quantum-resistant addresses via a pay-to-merkle-root scheme using the bc1z format. BIP-360 does not yet activate any consensus changes on the mainne…
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Up to 470 billion US dollars in Bitcoin could be attacked by quantum computers in the long term. Older bitcoin addresses would be affected in particular.