Ethereum researchers submitted a draft proposal on Aug. 24 to replace the network’s validator deposit contract. The goal: a contract that can accept quantum-resistant signature schemes. It is the first concrete step toward retiring the BLS cryptography that secures roughly 35 million staked ether.
The pull request, filed as #12235 on the ethereum/EIPs repository, would introduce a new deposit contract that accepts variable-length public keys, signatures and credential metadata. A scheme identifier would distinguish between cryptographic systems. Scheme 0 preserves the existing BLS format for backward compatibility, while higher-numbered schemes could carry post-quantum alternatives the proposal deliberately does not select.
In practice, the contract would let validators deposit using new key types without a second contract deployment for each scheme change. That is a structural change. The contract on its own would not make Ethereum quantum-resistant. A separate consensus-layer modification would still need to define how validators verify, aggregate and process signatures under each new scheme before any post-quantum algorithm could secure the network.
The design relies on EIP-7685, the general request system between Ethereum’s execution and consensus layers, to carry deposit requests. That framework already supports EIP-6110 for validator deposits, EIP-7002 for execution-layer-triggered withdrawals and EIP-7251 for validator consolidations. Routing post-quantum deposits through the same channel avoids the legacy Merkle-tree mechanism the current contract uses.
Migration is staged. The new contract would deploy with BLS deposits enabled, then allow additional schemes to be registered later. A subsequent protocol decision could permanently disable new Scheme 0 deposits, an irreversible “BLS retirement mode” once activated. Existing BLS validators would not automatically disappear when the switch flips; separate rules would govern their exits, credential changes and migration.
An editor suggested assigning the proposal EIP-8394, though that number had not appeared on the canonical EIP website as a published standard at press time. The pull request carried draft and core-proposal labels and awaited editor consensus, formal review and automated checks. Three authors are named on the draft: Kevaundray Wedderburn, Tom Wambsgans and Thomas Coratger. Wedderburn said the subject had been raised during an All Core Developers Execution meeting, according to crypto.news.
No target fork, testnet activation or mainnet deadline was announced. The proposal is a draft, not an accepted EIP.
Ethereum’s broader roadmap treats quantum resistance as a long-term priority, with planned changes extending beyond validator signatures to KZG commitments and ECDSA account keys. The deposit contract addresses only the staking surface; a full post-quantum transition would also need to cover data commitments, zero-knowledge systems and externally owned accounts.
The contract is post-quantum-ready. The network is not yet.
