All I need to assert is there will never be any radically superior technology that is accessible to the NSA long before it is accessible to commercial bitcoin miners, and I think that's plausible. The NSA doesn't innovate in semiconductor fabrication, Intel and TSMC do. The only way the NSA could plausibly gain a significant hash rate advantage over commercial bitcoin miners is by breaking SHA-256, which has nothing to do with hardware.
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All I need to assert is there will never be any radically superior technology that is accessible to the NSA long before it is accessible to commercial bitcoin miners, and I think that's plausible. The NSA doesn't innovate in semiconductor fabrication, Intel and TSMC do. The only way the NSA could plausibly gain a significant hash rate advantage over commercial bitcoin miners is by breaking SHA-256, which has nothing to do with hardware.