Project Eleven has released The Quantum Threat to Blockchains 2026 Report, an analytical framework for measuring progress toward a cryptographically relevant quantum computer (CRQC). The model places Q-Day, the point at which widespread quantum attacks on cryptographic keys become feasible, at a baseline of 2033, with optimistic and pessimistic scenarios at 2030 and 2042.
Overview
The report provides a comprehensive vulnerability analysis of the blockchain ecosystem, with recommendations for enterprises and protocols preparing for Q-Day. It outlines an approachable framework for understanding quantum computing and a model for estimating Q-Day, allowing users to generate their own forecasts as new information emerges.
What it does
The framework is built on published research from Google and other quantum leaders, and it provides a standardized measure of quantum progress. The report consists of two sections: the first explains how quantum computers work and presents a model for evaluating their progress, while the second provides a comprehensive vulnerability analysis of the blockchain ecosystem.
The report highlights that every major blockchain that relies on elliptic curve signatures faces the same underlying problem, but the engineering path forward is different for each one. Each protocol will have to redesign different parts of their stack to absorb post-quantum signatures. Recent resource estimates by Google and Oratomic have reduced the baseline for breaking RSA-2048 by multiple orders of magnitude, making it essential for protocols to start preparing for Q-Day now.
Tradeoffs
The transition to post-quantum cryptography will require significant changes to the existing infrastructure. Protocols will need to redesign their stacks to absorb post-quantum signatures, which will require significant investment and resources. However, the cost of not preparing for Q-Day could be much higher, as quantum attacks on cryptographic keys could compromise the security of the entire blockchain ecosystem.
In conclusion, The Quantum Threat to Blockchains 2026 Report provides a valuable framework for understanding the threat of quantum computing to blockchain security and preparing for the transition to post-quantum cryptography. As the quantum threat landscape continues to evolve, it is essential for protocols and enterprises to stay ahead of the curve and start preparing for Q-Day now. The report is available on the Project Eleven blog, and it provides a comprehensive guide for anyone looking to understand the quantum threat and prepare for the future.