Quantum Shadow Over Bitcoin: Coinbase Report Exposes Cold Wallet Vulnerabilities in Address-Reuse Era
A Coinbase-authored quantum computing risk report identifies exchange-operated cold wallets and millions of Bitcoin as cryptographically vulnerable due to the longstanding practice of address reuse. The report reveals that addresses which have already broadcast a transaction expose their public keys on-chain, providing future quantum computers a viable attack surface to derive private keys. This finding places institutional custodians at the center of a systemic risk conversation that the broader crypto industry can no longer defer.