The quantum clock is ticking: it's Bitcoin's problem, not Ethereum's

§ 01 Executive Snapshot

• What: Citi analysts warn that Bitcoin faces significantly greater quantum risk than Ethereum due to its foundational cryptography.
• Who: Key players include Citi analysts, Google Quantum AI, Nic Carter, and Ethereum developers.
• Why it matters: The findings highlight critical governance and technological vulnerabilities in Bitcoin, impacting institutional investment strategies.

§ 02 Key Developments

• A recent report from Citi confirms that quantum computing could break Bitcoin's cryptography with a quantum computer operating at fewer than 500,000 qubits in approximately nine minutes.
• Nic Carter estimates that as many as 6.9 million BTC could be vulnerable to quantum attacks, including legacy wallets and Taproot outputs.
• Ethereum has a structured roadmap for quantum resistance that includes the Pectra upgrade and upcoming Hegotá hard fork, facilitating a proactive approach to quantum threats.

§ 03 Strategic Context

• Bitcoin's governance is conservative, making it slow to adapt to necessary upgrades, as illustrated by the lengthy adoption periods for SegWit and Taproot.
• Ethereum's architecture was designed to accommodate upgrades more fluidly, allowing for quicker adaptations to emerging risks like quantum computing.

§ 04 Strategic Implications

• Immediate market implications include potential shifts in institutional investment towards Ethereum as a more adaptive asset in light of quantum risks.
• Long-term implications could see Bitcoin's value and adoption challenged if governance fails to address quantum vulnerabilities effectively.

§ 05 Risks & Constraints

• Bitcoin's slow governance process could lead to a critical failure in responding to quantum threats, risking significant losses for institutional holders.
• The division among Bitcoin developers regarding the urgency of quantum upgrades presents a governance liability that could hinder timely responses.

§ 06 Watchlist / Forward Signals

• The upcoming Hegotá hard fork in Ethereum, planned for the second half of 2026, will be a key milestone in enhancing quantum resistance.
• Institutions will closely monitor the development of Bitcoin's quantum proposals (BIP-360 and BIP-361) to assess the urgency and effectiveness of response strategies.