New research from Glassnode estimates that around 6.04 million Bitcoin — worth roughly $469 billion — may be vulnerable to future quantum computing attacks because their public keys are already exposed on-chain. The report says much of the risk comes from address reuse, with crypto exchanges alone holding about 1.66 million BTC in potentially unsafe wallets. The findings matter because advances in quantum computing could eventually threaten older Bitcoin security methods, increasing pressure on the industry to prepare stronger protections before the technology becomes practical.
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