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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The theory with quantum computing is that rather than have to calculate millions or billions of possible keys and check each one in turn to see if you've found the correct one, you simply point your quantum box at the task and it calculates all possibilities simultaneously. You then simply pick out the one that did the trick.
Not theory. There are production chips / computers at 50+ Qubits.
Notice the coincidence of Q with Qubits.