Google's quantum paper made headlines with that number. Here's what it means, what's actually at risk, and why 6.9 million bitcoin are more exposed than the rest. New research from Google's Quantum AI team suggests a future quantum computer could derive a bitcoin private key from a public key in about nine minutes, potentially allowing attackers to hijack transactions before they are confirmed. Roughly one-third of all bitcoin, including early coins and any held in addresses…
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