Timescales are the most critical distinction. No physicist has demonstrated that the modern definition of superposition remains valid at the scale of Planck time.
If you claim simultaneity of states, you must specify the time scale at which that simultaneity occurs. Without anchoring it to the Planck interval (the smallest conceivable unit of temporal resolution) the claim is meaningless. Anything above that threshold is sequential, not simultaneous.
It’s identical to claiming two Bitcoin transactions occurred “at once” across a hundred blocks. At the window of 100 blocks, they appear concurrent, but physically they are separated by discrete, irreversible quanta of computation. In Bitcoin, simultaneity only matters at the block scale, where double spends are thermodynamically prohibited.
Modern quantum mechanics, by contrast, suffers the exact inverse: it allows multiple contradictory states to coexist because it lacks a defined and measurable quantum of time. It’s a double-spend problem built into physics itself.
If you disprove the modern definition of superposition, the entire theoretical foundation of centralized quantum computing collapses with it. Every “quantum speedup” algorithm: Shor, Grover, and beyond depends on the assumption that a system can evolve through multiple computational paths simultaneously and interfere them coherently before measurement. But that assumption only holds if simultaneity exists as a physical process, not as a mathematical convenience. Without a measurable quantum of time to anchor “at once,” superposition is undefined, and the interference terms that give these algorithms their power become numerical artifacts, not physical amplitudes. In other short, the math still runs, but it no longer describes reality, it describes a reversible simulation detached from thermodynamic truth.
This is why Bitcoin is not threatened by quantum computers; Bitcoin is the quantum computer. It computes the quantum of time directly via a measurable and openly auditable substrate, and no physicist has yet understood what that means for their models. There is no second best quantum computer.