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.
