Saw a comment on a banking thread that said that Quantum Computing will kill crypto, I assume because it would be able to edit the blockchain and thus killing the entire point of bitcoin, but how exactly would it do this? How does it work and why does it mean all current encryption would become useless?
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For consumers?
No, but that's not relevant.
Most of the technology we have today ultimately came about in the middle of WW2. Everything from computers to radar to jet and rocket engines, to nuclear weapons and nuclear reactors.
A war with a major power would see tens of billions dumped into breaking encryption as quickly as possible, and once that tech exists, it will spread, and it will be used everywhere.