Ethereum researcher proposes $0.07 quantum-resistant account upgrade

The research focuses on SPHINCS-, an EVM-optimized family of stateless post-quantum signatures derived from SPHINCS+ and recent compact hash-based designs. By utilizing a Solidity verifier, the system allows wallets to perform quantum-resistant signature checks at a practical cost. One specific variant, C13, handles verification at approximately 127,000 gas with a 3,704-byte signature, supported by a formal proof through Verity.

This approach targets the vulnerability of current ECDSA signatures, which underpin both Bitcoin and Ethereum accounts and remain susceptible to potential future quantum computing attacks. By shifting the defense mechanism to the account level, individual wallets can adopt these protections immediately. This strategy aligns with broader Ethereum roadmap goals regarding security and privacy, complementing ongoing discussions by Vitalik Buterin on account abstraction.

While the design has undergone an initial review with Fable, further audits remain necessary before widespread implementation. The current proposal acknowledges technical constraints, including non-standard settings and signature count limitations, distinguishing these hash-based designs from NIST-aligned versions. Rather than replacing long-term protocol upgrades, this wallet-based route provides a pathway for high-value accounts to test defenses and secure assets without relying on future network-level changes.