Ethereum Moves to Protect Staking from Quantum Threat

Ethereum has taken its first step towards protecting staking against the quantum threat by proposing to rebuild the contract used for validators who enter staking.

The proposal, submitted to the Ethereum Improvement Proposal (EIP) repository on Monday, aims to address a hidden restriction in the existing contract: it hardcodes the dimensions of BLS12-381, fixing public keys at 48 bytes and signature metadata at 96. Post-quantum schemes require a significantly larger space, which the current contract does not provide.

The new proposal would allow up to 8,192 bytes for both credential keys and metadata, requiring each deposit to declare its 'credential scheme.' The zero scheme means BLS. However, the proposal leaves defining what a post-quantum validator key actually looks like for future EIPs.