Coinbase Warns Bitcoin Must Address Quantum Computing Threat to Dormant Coins

Coinbase's quantum advisory council warns that Bitcoin must prepare for the threat from quantum computers, which could break its cryptography and put an estimated 7 million BTC at risk. The report sparks a debate over whether to burn or protect unmigrated dormant coins, highlighting Bitcoin's slow governance in contrast to Ethereum's proactive quantum-resistance roadmap, which is already being implemented.

Quantum computing cryptographic vulnerability

• ▪A sufficiently advanced quantum computer could theoretically derive a Bitcoin private key from its public key in about nine minutes.
• ▪Investor Tim Draper argued that banks are more at risk from quantum computing than Bitcoin due to "harvest now, decrypt later" vulnerabilities.
• ▪A March 2026 paper by Google Quantum AI, Stanford, and the Ethereum Foundation found computing resources to break Bitcoin's cryptography are 20 times lower than previously estimated.
• ▪Approximately 7 million Bitcoin are considered vulnerable to future quantum attacks due to exposed public keys from address reuse.
• ▪Bitcoin's vulnerability is its ECDSA signature algorithm, while its SHA-256 mining algorithm is considered effectively secure for decades.

Bitcoin governance upgrade paralysis

• ▪Nic Carter, co-founder of Coin Metrics, accused Bitcoin developers of "sleepwalking towards collapse" regarding the quantum threat.
• ▪Bitcoin's conservative, consensus-driven governance makes upgrades slow, with SegWit and Taproot each taking over 7 years for widespread adoption.
• ▪The central governance debate is what to do with coins in dormant or abandoned addresses that are never migrated to quantum-safe cryptography.
• ▪Proposed solutions for unmigrated coins include burning them, doing nothing to preserve property rights, or implementing compromises like the "Hourglass Proposal."

Ethereum post-quantum infrastructure

• ▪Ethereum's Pectra upgrade in May 2025 and the upcoming Hegotá hard fork are steps in its quantum-resistance plan.
• ▪Ethereum's architecture allows individual accounts to voluntarily adopt quantum-safe signatures, avoiding a single contentious network-wide hard fork.
• ▪The Ethereum Foundation has a structured roadmap for quantum resistance, targeting completion of core post-quantum infrastructure by approximately 2029.

Corporate treasury quantum risk

• ▪Nic Carter estimates a quantum computer could meaningfully break elliptic curve cryptography as early as 2028.
• ▪Coinbase's quantum advisory council released a report urging blockchain developers to begin planning for post-quantum migration.
• ▪A May 18, 2026, Citi research note warned that quantum computing advances have shortened the timeline for practical attacks on digital assets.
• ▪U.S. federal agencies faced an April 2026 deadline to submit post-quantum cryptography transition plans under National Security Memorandum 10.

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