Ethereum proposes post-quantum deposit contract for 37M staked ETH

Ethereum researchers proposed a post-quantum validator deposit contract on Aug. 26, targeting leanXMSS migration to secure 37 million staked ETH.

"Feedback on EIP-7251, 8282, and 7002 is awaited to determine the final plan," kevaundray, the developer who filed the proposal as EIP-8394, said in GitHub comments.

The draft replaces the current fixed-size BLS deposit format with variable-length public keys and metadata, assigning the existing BLS standard identifier "Scheme 0." Data would reach the consensus layer via execution requests through EIP-7685, replacing the Merkle tree mechanism. The contract includes an irreversible BLS exit mode, letting future forks permanently retire BLS deposits through system calls.

The Ethereum Foundation has formed a dedicated post-quantum security team targeting full protection by around 2029. The proposal does not immediately activate new credential schemes but lays groundwork to avoid emergency hard forks if quantum breakthroughs occur. Validators relying on current BLS signatures face migration costs, while the network gains long-term consensus security.

Monad and Kohaku Follow Suit

The proposal is part of a broader push across Ethereum's ecosystem. In June, Nicolas Consigny, Kohaku project leader at the Ethereum Foundation, introduced a concept for post-quantum account protection without a hard fork. The Kohaku approach and EIP-8394 together address both the validator layer and user accounts.

EVM-compatible protocol Monad has proposed a similar model at the account level. Initiative authors Kushal Babel and Jan Camenisch aim to separate the permanent wallet address from the data users use to verify control over it, allowing accounts to change keys without changing addresses. This would let accounts upgrade to quantum-resistant schemes without mass token transfers.

Draft Faces Consensus and Testing

The EIP-8394 proposal remains in draft stage and requires consensus, testing, and client support before any network upgrade. The full transition to quantum-resistant cryptography will also require changes beyond validator deposits, including account signatures. The proposal is designed to be forward-compatible, capable of carrying larger or different post-quantum credentials as the ecosystem evolves.

The migration from classical cryptography to post-quantum cryptography is a technological substitution that will unfold over multiple forks. The new deposit contract enables credential scheme scalability, allowing the network to smoothly retire BLS in future upgrades. For validators, the transition means adapting to new signature schemes, while for the broader ecosystem, it strengthens long-term consensus security against quantum computing threats.

This article is for informational purposes only and does not constitute investment advice.