Ethereum Foundation’s Kohaku proposes post-quantum account protection for $0.07

Quantum computing is the boogeyman that blockchain security researchers have been warning about for years. The Ethereum Foundation just put a price tag on peace of mind: roughly seven cents per account.

The Foundation’s Kohaku project proposes deploying post-quantum protected accounts using the ERC-4337 smart account standard, no hard fork required. The cost to deploy one of these quantum-resistant account contracts on Ethereum’s Layer 1 testnet clocks in at approximately $0.07.

What Kohaku actually does

Today’s Ethereum accounts rely on elliptic curve cryptography to sign transactions. A sufficiently powerful quantum computer could theoretically crack those signatures, meaning someone with enough qubits could forge transactions and drain wallets.

Kohaku’s approach uses ERC-4337, the account abstraction standard, to swap in post-quantum signature schemes at the individual account level. Instead of waiting for the entire Ethereum network to agree on a massive protocol change, users can voluntarily upgrade their own accounts to quantum-resistant versions.

The key detail is that this is opt-in. Nobody is forced to migrate. Users who want to protect their holdings against future quantum threats can deploy a Kohaku-style smart account whenever they choose.

This matters because hard forks require network-wide consensus, extensive testing, and coordination across thousands of node operators. Kohaku sidesteps all of that by working within Ethereum’s existing infrastructure.

The team and the timeline

The Ethereum Foundation’s Post-Quantum Security team was formally established in January 2026, led by Thomas Coratger.

Justin Drake, one of Ethereum’s most prominent researchers, has identified post-quantum security as a top strategic priority. The team runs biweekly developer meetings and has established research incentives to attract talent to the problem.

Nico, a key contributor to Kohaku, has been the public face of the project’s recent demonstrations. The testnet deployment showing the $0.07 cost came from his work, providing the first concrete benchmark for what quantum protection might actually cost at the individual level.

Full protocol readiness for account abstraction utilizing post-quantum signatures is targeted for around 2029.

The project also integrates post-quantum features with existing privacy enhancements, suggesting the Foundation is incorporating quantum resistance into a broader security and privacy roadmap.

Why this matters for investors and the broader market

No major blockchain has completed a full post-quantum migration yet. Ethereum currently has an estimated 0.1% of its dormant funds sitting in quantum-vulnerable accounts.

For risk-averse holders, particularly institutions sitting on large Ethereum positions, Kohaku offers a way to protect assets without waiting for the entire network to upgrade.

The 2029 target for full protocol readiness creates a clear timeline for the market to price in. Traders and investors now have a roadmap, not just vague promises about future upgrades.