Coinbase Quantum Report Flags 7M Bitcoin Exposed by Address Reuse, Including Exchange Cold Wallets

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According to Coinbase's Independent Advisory Board on Quantum Computing and Blockchain, roughly 7 million bitcoin sit in addresses exposed to a future quantum attack, with much of that exposure found in active funds including cold wallets operated by known exchanges, the board said in a report published Thursday. About 1.7 million bitcoin occupy roughly 20,000 legacy pay-to-public-key (P2PK) addresses where the public key is fully visible onchain. The remaining 5 million bitcoin are at risk due to address reuse, where public keys have already been revealed, with most of those coins belonging to active users rather than lost wallets, according to the report citing quantum-security firm Project Eleven.
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