The Ethereum ecosystem is taking an important step toward a post-quantum reality. A fresh EIP draft proposes an architectural overhaul of the deposit contract, which is currently tightly tied to BLS signatures on elliptic curves. The initiative aims to make the validator onboarding mechanism crypto-agnostic, paving the way for implementing algorithms resistant to quantum computer attacks without a painful restructuring of the entire infrastructure.
The Essence of the Proposal: Flexibility Instead of a Rigid Standard
The key idea is to abandon a monolithic structure in favor of an adaptive format. Public keys and associated metadata are proposed to be transmitted as variable-length fields, with the specific cryptographic scheme identified by a separate numeric code. The current BLS standard would be assigned identifier Scheme 0. This creates a foundation onto which any post-quantum algorithms can be "strung" in the future without changing the base protocols.
Moreover, the authors propose modernizing the way deposits are processed. Instead of the familiar Merkle tree, data is planned to be transmitted to the consensus layer via the EIP-7685 request execution mechanism. This will simplify interaction between layers and improve overall efficiency.
Special attention is paid to the smoothness of the transition. The draft provides for a phased deactivation of BLS: first, support for new deposits with the old scheme is retained for a transition period, and then fully deactivated. This allows the network to migrate without sharp jumps or downtime.
Monad: Quantum Protection at the Account Level
In parallel, developers of the EVM-compatible Monad protocol are advancing a similar concept, but at the level of user accounts. The initiative's authors, Kushal Babel and Yan Kamnish, propose separating the permanent wallet address from dynamic authentication data. In their model, the same address will be able to sequentially use different keys — from classical to post-quantum — as well as combine them into a multisignature.
The mechanism also includes flexible access recovery scenarios. For example, if the owner loses the primary key, two trusted parties will be able to jointly set a new one without changing the address. This solves one of the main problems of modern wallets, where losing a key means losing funds.
For now, this is merely a concept describing the overall architecture. The full technical specification is still ahead, but the authors guarantee that existing accounts will continue to work without changes. Meanwhile, the Ethereum Foundation has already proposed post-quantum account protection without a hard fork, indicating systematic work in this direction.
My analysis: These initiatives are not just insurance against a hypothetical threat. They are a strategic maneuver that strengthens trust in the network for decades to come. Flexibility in cryptography is not a luxury but a necessity for a protocol claiming the role of a global settlement layer. Implementing such mechanisms now will save the ecosystem from a chaotic migration of assets in the future, when quantum computing becomes a reality.