The Ethereum Foundation’s Kohaku project lead Nicolas Consigny revealed on June 13, 2026, that Ethereum accounts can now implement quantum-proof security for as little as $0.07 per transaction.
The proposal introduced by Nicolas Consigny utilizes a modified version of the SPHINCS+ signature standard, labeled SPHINCS-, which allows individual users to opt-in to post-quantum protections without waiting for a network-wide hard fork.
By leveraging the existing ERC-4337 account abstraction standard, the breakthrough significantly lowers the cost and technical barriers to securing digital assets against future quantum computing threats.
The research, shared by Nicolas Consigny via social media, marks a major milestone in the Ethereum Foundation’s accelerated roadmap to harden the network. While traditional Elliptic Curve Digital Signature Algorithm (ECDSA) signatures are currently secure, researchers like Giancarlo Lelli have already demonstrated that smaller elliptic-curve keys can be broken by quantum prototypes.
This development arrives as the Ethereum Foundation formally established its Post-Quantum Security team in January 2026, headed by Thomas Coratger, to address these looming cryptographic vulnerabilities.
The timing is critical because the window for a proactive defense is narrowing. In March 2026, Google Quantum AI published data estimating that 1,200 logical qubits could break the 256-bit encryption that currently protects most blockchain accounts. This constant pressure on cryptographic standards is why many Bitcoin signals indicate shifting market structure as institutional players look for long-term security guarantees against state-level computing power.
Lowering gas costs for quantum resistant Ethereum accounts
The core of the proposal is the optimization of “SPHINCS-,” a stateless hash-based signature scheme designed specifically for the Ethereum Virtual Machine (EVM). Nicolas Consigny noted that the C13 variant of this scheme can verify a signature for approximately 127,000 gas. At current network prices, this translates to the $0.07 figure, making it a viable option for high-value wallets that require immediate protection.
This cost is remarkably close to the standard 3,000 gas required for a traditional ECDSA signature, which typically costs around $0.10 depending on congestion. By making the cost of security almost negligible, the Ethereum Foundation aims to encourage early adoption. Users do not need to wait for a protocol-level change; they can simply upgrade their smart contract wallets to include post-quantum logic today.
The transition is supported by EIP-8141, a proposal that enables account abstraction and allows accounts to specify custom verification logic. This flexibility is essential as the industry prepares for more aggressive network upgrades. For instance, developers are already tracking how David Schwartz details XRP Ledger’s doomsday protocol as a separate approach to surviving catastrophic cryptographic failures.
Technical specifications of the SPHINCS- proposal
The SPHINCS- signature size for the C13 variant is approximately 3,704 bytes. While this is significantly larger than a standard signature, the EVM-optimized verifier ensures that the gas consumption remains manageable. The research also includes a formal proof written in Lean 4 through the Verity framework, providing high assurance that the implementation is mathematically sound.
Nicolas Consigny explained that SPHINCS- serves as a bridge toward “leanSPHINCS,” a future version meant to reduce costs even further through signature aggregation. This phased approach allows the community to gain experience with post-quantum signatures before they become the default standard. The entity Fable has already completed an initial review of the SPHINCS- design to ensure its robustness.
Strategic roadmap for Ethereum post-quantum security
Co-founder Vitalik Buterin has been vocal about the “Lean Ethereum” roadmap, which targets 2029 for full post-quantum integration. However, the SPHINCS- proposal provides an immediate “quantum panic button” for the most cautious users. This aligns with recent industry trends where major tech giants like Google have set internal 2029 deadlines for migrating their own systems to quantum-resistant standards.
The Ethereum Foundation’s strategy focuses on individual choice rather than forced migration. By enabling protection at the account level, the network avoids the risks associated with a rushed, mandatory hard fork. This cautious but steady progress is often contrasted with other ecosystems, such as when Scott Bessent rejects central bank digital currency or other centralized financial tools that may not have the same open-source scrutiny.
Beyond the individual wallets, the development of “leanSPHINCS” will be a cornerstone of Ethereum 3.0, expected to launch in 2027. Researchers like Justin Drake and Thomas Coratger are exploring how these stateless signatures can be bundled to keep the blockchain from bloating.
For now, the 7-cent solution offers a practical defense for those who believe the quantum threat is closer than the end of the decade.
Future iterations of the Hegotá hard fork may eventually bake these protections into the base layer. Until then, the work of Nicolas Consigny and the Kohaku team ensures that Ethereum users have the tools to stay one step ahead of the “Q-Day” scenario where traditional encryption fails.
The ability to switch signature schemes via smart contracts remains one of Ethereum’s most significant advantages in this technological arms race.