Cracking open a Bitcoin private key?
How far along is quantum computing?
Is Bitcoin really at risk?
My one-sentence impression of recent quantum supremacy stuff so far is that it is to real quantum computing what hydrogen bombs are to nuclear fusion. Proof that a phenomenon and the capability to extract power from it exist, but still far from directed use toward useful things.
— vitalik.eth (@VitalikButerin) October 24, 2019
What can be done?