4 million BTC (about 25% of all Bitcoins) are potentially at risk from a quantum attack. The mentioned stash is valued over 40 billion USD. The stories about bitcoin being at risk of being obliterated by quantum computing have been going around for a long time now. But they were especially enforced by Google’s recent announcement of its supercomputer achieving quantum supremacy. Naturally, many started wondering whether or not quantum computing truly represents a danger
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