Ethereum developers have proposed a new post-quantum deposit contract (EIP-7685) to reduce reliance on the current BLS-based staking and boost security against future quantum threats.

The draft aims to enable flexible post-quantum cryptographic tools and upgrades as part of Ethereum’s broader consensus-layer updates.

A key feature would overhaul the validator deposit contract to be quantum-proof by allowing variable-length keys and credential metadata, enabling post-quantum credentials for staking.

The proposal remains in draft and under review, with final details expected later.

The draft would permanently halt new deposits using the current BLS signature scheme, signaling a future transition away from BLS.

Analysts note broader Ethereum expectations, including tokenization, AI, and price scenarios, though these are separate from the core protocol upgrade.

Context includes ongoing research on the quantum threat to blockchains and expert opinions, framing the challenge as more than a simple upgrade.

Uncertainty in cryptography for post-quantum transitions is highlighted, with debates on hash-based signatures and data-scale implications for Ethereum’s readiness by the 2030–2033 window.

The proposal does not specify the exact quantum-resistant signature scheme; selection would come in a subsequent EIP.

A major change is removing hardcoded BLS12-381 key/metadata sizes and allowing up to 8,192 bytes for keys and credentials, with each deposit indicating its credential scheme.

Details on the cryptographic scheme are deferred, requiring coordinated forks across consensus and execution layers for activation, and there are no deployment addresses or timestamps yet.

Market context shows ETH trading around the high $2,400s, with strong institutional demand exemplified by BlackRock’s ETH ETF inflow.