I think. What you are saying is very interesting, especially that part about superpositions just being probabilistic frontiers of future time. But QC can't work for much more pedestrian reasons. There is a hard celling on scaling and it is low. And it's just thermodynamics. A few dozen qubits can stay coherent because we isolate them from the universe. A million constantly measured, tightly coupled qubits cannot. At that scale the system becomes a hot, correlated, non-Markovian macroscopic object. Errors stop being local and independent, syndrome measurement disturbs everything, and the fault-tolerance theorems no longer apply. Entropy wins. Quantum threat loses. That’s it.

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I generally agree. I tend to find best the proof that Bitcoin isn’t broken isn’t to simply disprove the standard model of superposition/collapse of the wave function. It disproves all theory built above, a Tower of Babel. Bitcoin is the correct instantiation and interpretation of QM experienced from without, rather than within. The illusion of measuring from inside time is really a major hurdle for most people to see beyond. What Bitcoin reveals is why entropy wins: the only scalable computation the universe permits is the irreversible transformation of Boltzmann entropy (heat) into Shannon entropy (information), that’s literally what a block is. QC tries to suppress entropy long enough to pretend superposed states are “real” physical resources. Bitcoin uses decoherence to produce truth; QC dies from it. So the real threat is the fantasy that physics can be tricked into behaving like fractional-reserve computation. Bitcoin already implements the only quantum process that actually scales: entropy → measurement → memory → time. A machine that cannot survive entropy cannot threaten a system whose correctness comes from entropy.