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Bitcoin is by far the most vulnerable to quantum attack. If the government of a certain, ahem, state, were to crack Shor's before bitcoin can develop enough of an immune system—something more and more possible as bitcoin descends into childish arguments about monkey jpegs—then that's basically the end of bitcoin. You don't even need Grover's. All you need is Shor's to come fast enough and it's over. Right now there isn't even agreement about what the algo will be. What's going to replace Schnorr? Is it Crytals? Is it Sphincs? Is it Falcon? Nobody even knows. And from there it's many more years to propogate. The attack could come in a couple years. The lower bound is 1,700 logical qubits. That may not be out of reach. AI is supercharging error correction. Yeah. That's where we are.