The quantum clock is ticking: it's Bitcoin's problem, not Ethereum's
The piece argues quantum computing poses a bigger near-term threat to bitcoin than Ethereum, and says Ethereum is moving faster on post-quantum defenses.
Intelligence analysis by GPT-5.4 Mini
Samir Tabar argues that recent research from Citi and Google Quantum AI shifts quantum risk from a distant worry to an urgent issue for bitcoin holders. His core claim is that bitcoin's conservative governance makes upgrades slow, while Ethereum has already started building a post-quantum path.
Bitcoin is like a safe with a lock that might be easier to crack someday, and changing that lock takes a long time. Ethereum is being built to swap locks more easily, so the article says it looks better prepared if that day comes.
Analysis
Bitcoin’s exposure
The article says bitcoin is more exposed to quantum attacks because its signature system reveals a public key when a transaction is broadcast, which could be attacked by a sufficiently advanced quantum computer. It cites a Citi research note from May 18, 2026 and a late-March paper from Google Quantum AI, Stanford University, and the Ethereum Foundation that reportedly lowered the estimated computing cost to break bitcoin’s cryptography. The piece also leans on Nic Carter’s earlier warnings that quantum computing is bitcoin’s biggest long-term cryptographic risk.
Governance is the bottleneck
The author’s main non-technical argument is that bitcoin can, in theory, upgrade, but in practice it moves slowly. SegWit and Taproot both took years to reach wide adoption, and the draft quantum proposals cited in the article, BIP-360 and BIP-361, are still early. The article argues that a base-layer move to post-quantum signatures would be unusually contentious for bitcoin, which makes delay itself part of the risk.
Ethereum’s different path
Ethereum is presented as having already moved into a structured migration. The article points to NIST post-quantum standards finalized in August 2024, the Pectra upgrade in May 2025, and EIP-7702 as a step toward account abstraction. It says Ethereum’s design lets users choose quantum-safe signatures voluntarily, with further protocol work planned in a 2026 Hegotá hard fork and a broader target around 2029.
Institutional angle
The piece closes by tying the issue to policy timelines: U.S. agencies have a 2026 transition deadline, the EU has a 2030 target for critical infrastructure, and the G7 has published a financial-sector roadmap. The author’s point is that treasury holders of bitcoin may eventually face pressure to treat quantum readiness as an operational requirement, not a speculative concern.
Key points
- Citi and Google Quantum AI are presented as evidence that quantum risk to digital assets is becoming more immediate.
- The article says bitcoin is more exposed because its public keys can be revealed onchain during spending.
- Bitcoin’s conservative governance may make a post-quantum upgrade slow and contentious.
- Ethereum is described as already building toward quantum resistance through account abstraction and planned protocol upgrades.
- The piece argues institutional holders may need to treat quantum readiness as part of treasury risk management.
If the article’s thesis holds, Ethereum’s early work on post-quantum signatures could make it look more adaptable to institutions that care about long-term custody risk. Bitcoin could still upgrade successfully, but only if the community moves faster than it has on past protocol changes.
If quantum progress accelerates before bitcoin finishes a migration, older wallets and exposed outputs could become a larger risk than holders expected. The article also warns that bitcoin’s slow governance could leave institutions stuck waiting while the threat becomes more concrete.
