Google’s quantum computing threatens Bitcoin and crypto, you say? Really great point. Much better to store your money in… *checks notes* decades-old bank backends powered by COBOL mainframes and secured by the exact same (or worse) cryptographic primitives.

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The difference is gated access tho. If the entire security under pinning the system, the hash rate + sha256, can be compromised by Shor's then it does pose a real threat because nothing can stop it.

In the case of fiat you just pull the Internet plug.

Bank kills their hard-line to the Internet until a clear picture emerges. I would assume post Saudi Aramco hack that most businesses have an evac plan in place to enable this and then with the core infrastructure air gapped they can just have humans serve as info couriers.