Ethereum researchers propose quantum-resistant staking scheme, plan to restructure validator deposit contract.

Ethereum researchers have released an early draft proposing to restructure the validator deposit contract to support varying key lengths and multiple cryptographic signature schemes, laying the groundwork for future adoption of post-quantum signatures. The existing contract hardcodes BLS key sizes, meaning even if developers identify new post-quantum schemes, the network cannot currently integrate them directly. The draft will tag each deposit with the cryptographic system used, assigning tag 0 to BLS and reserving all other tags for future schemes. If approved, new signature schemes can be integrated alongside BLS; Ethereum could later vote to permanently stop accepting new BLS deposits, though validators already staking with BLS keys will not exit immediately. The draft currently uses a temporary identifier, with maintainers suggesting it be designated EIP-8394. As of Wednesday, roughly 42.4 million ETH is staked on Ethereum, valued at approximately $104 billion, all secured by BLS validator keys. In March this year, Google Quantum AI outlined 5 potential quantum attack vectors targeting Ethereum, impacting over $100 billion in assets across wallets, staking, smart contracts, and Layer 2 networks. The Ethereum Foundation currently plans to complete core protocol-level adjustments related to this by around 2029.