Ethereum has spent five years telling users to “go to Layer 2”. The Ethereum Interop Layer (EIL) is the moment it admits that sending people to a maze of rollups without a map was never going to scale.
Announced by the Ethereum Foundation on Tuesday, the Ethereum Interop Layer sits inside the wallet and treats the rollup ecosystem as one logical network. Instead of thinking in terms of Arbitrum, Optimism, Base or ZKsync, the user thinks in terms of “send”, “swap”, “mint”, and the wallet handles the rest.
Ethereum Interop Layer: wallets as routers
Today’s L2 experience is a mess of bridge UIs, chain selectors and half-remembered token locations. EIL’s answer is to turn the wallet into the routing layer.
With EIL, a user signs one transaction to move assets or interact with a dApp across any EVM-compatible L2. There is no explicit bridge step, no manual chain switching, and no hunting for the “right” gas token. The wallet decides how to route, execute and pay, then presents the result as a single action.
Crucially, the Ethereum Interop Layer is designed to be trustless rather than yet another relayer cartel. It leans on ERC-4337 account abstraction so that interop logic lives in verifiable smart contracts controlled by the user’s wallet, not by an off-chain service. The security model remains Ethereum’s: no new third-party keyholders, no special bridges, no custodial middlemen.
On the developer side, EIL aims to compress complexity. Because it is natively compatible with all EVM rollups, L2 teams don’t need bespoke integrations. A single SDK and the emerging ERC-5792 standard let builders target “Ethereum plus its rollups” as one environment. Externally owned accounts can delegate to EIL logic via EIP-7702, while ERC-4337 wallets can adopt it directly.
The EF’s own analogy is HTTP: early web users didn’t need to care which server they were hitting, as long as the browser spoke the right protocol. Here, L2s play the role of servers; EIL turns the wallet into the browser.
Quantum risk stops being hypothetical
The launch landed alongside a much darker note in Buenos Aires. In his Devconnect keynote, Vitalik Buterin put a date range on Ethereum’s quantum problem.
His argument: if fault-tolerant quantum computers arrive earlier than expected, the elliptic curve cryptography underpinning Ethereum and Bitcoin stops being safe. Shor’s algorithm turns exposed public keys into private keys, making dormant or poorly structured wallets trivial to drain. Buterin floated a non-trivial probability of viable attacks before 2030, and warned that migration to post-quantum signatures needs to begin years before “Q-Day” shows up in a lab.
That is not a prediction that quantum hardware will be ready on cue; it is a coordination problem. Wallet upgrades, protocol changes and user migrations all move slower than hardware. Ethereum’s “Splurge” roadmap already includes quantum resistance as a theme; the message in Buenos Aires was that it can’t remain background research forever.
Kohaku: privacy back at protocol altitude
If EIL is about stitching rollups back together, Kohaku is about turning privacy from an optional extra into something closer to a default.
Unveiled alongside the Ethereum Interop Layer work, Kohaku is an open-source framework aimed at giving wallets a clean way to shield transactions and state reads. It integrates with mainstream wallets, lets users move funds into privacy-preserving circuits (for example through Railgun-style proofs), and supports private queries against on-chain state using TEEs and, eventually, more sophisticated primitives like PIR.
The design goal is narrow data exposure: every party should see only what is needed for a transaction to settle and be verified. On top of that sit “privacy-aware” account abstraction features, unified control of public and private balances, key rotation that doesn’t leak graph structure, and zk-flavoured attestations such as zkPOAPs.
The code is live, but the roadmap stretches out to around Devcon 2026. In other words, Kohaku is not a product launch; it is an attempt to systematise a decade of privacy work into something wallets can actually ship.
Structurally, Ethereum is making a clear bet: push most experimentation to L2s and wallets, harden the base layer, and treat usability, privacy and quantum risk as real engineering problems.
Disclaimer:
This article is for informational purposes only and does not constitute financial, investment, legal, or tax advice.
