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Satoshi Nakamoto warned of quantum computer threat in 2010; what countermeasures did he outline?

Satoshi Nakamoto, known as Bitcoin’s creator, was reported to have warned in 2010 about threats posed by quantum computers and to have outlined concrete responses. CoinPost said interest has revived in his old BitcoinTalk forum posts. Nakamoto argued that if the threat advanced gradually, there would be time to move to stronger algorithms. He described a user-led migration using wallet and client updates and also discussed responses to a scenario in which SHA-256 is broken.