Ethereum co-founder Vitalik Buterin announced a comprehensive protocol overhaul on July 5, calling it 'Lean Ethereum' - the third major iteration of the network. Writing on X, Buterin described the initiative as targeting quantum safety, privacy, cheaper data storage, and a potential EVM replacement. The announcement followed a meeting of Ethereum researchers held in Berlin in late June 2026, with the updated draft roadmap published at Strawmap.org outlining seven planned network upgrades through 2029. Buterin identified the upcoming hard fork Hegotá as almost certainly the last upgrade to predate the Lean Ethereum effort. The Ethereum Foundation has committed to making Ethereum (ETH) resistant to quantum computers by December 2029, treating the date as a fixed deadline rather than a research goal.
Ethereum developer Derek Chiang announced on September 7 a significant breakthrough in EIP-8141 implementation, describing it as a 'design breakthrough' in transaction processing. The innovation allows developers to express multiple transaction features as programmable contract calls instead of adding them separately to Ethereum's transaction envelope. The official draft specification defines Frame Transactions as sequences of contract calls, with different frames validating transactions, approving gas payments, or executing user operations. The proposal currently provides three modes: DEFAULT, VERIFY, and SENDER, with VERIFY frames checking required conditions and SENDER frames executing operations from transaction senders. Frames can be grouped into atomic batches where every operation succeeds together or the entire group reverts, providing enhanced transaction flexibility without requiring new envelope formats. Core developers moved EIP-8141 Frame Transactions from Considered for Inclusion to Scheduled for Inclusion during the August 27 All Core Developers Execution call, giving the proposal a formal place in the planned 2027 Hegotá upgrade.
The Ethereum Foundation's Protocol Cluster has set December 2029 as the deadline for making Ethereum's Layer 1 network resistant to quantum computer attacks. Fredrik Svantes, who leads protocol coordination at the Ethereum Foundation, stated that the cluster is 'aggressively targeting' a quantum-resistant L1 no later than December 2029. The commitment affects which proposals teams recommend for Hegotá and how they assess other protocol work. Planning for Q-day in 2030 is a deliberately aggressive assumption, according to the Foundation's priorities blog, with the cluster acknowledging it is front-running most credible forecasts. The Foundation will treat the deadline as non-negotiable at least until January 2027, when outside experts help reassess quantum progress. Roughly 65% of ETH already sits in quantum-vulnerable addresses, according to Project Eleven, highlighting the urgency of the transition.
The Ethereum Foundation published ratings for 62 Hegotá proposals after collecting 397 assessments from approximately 60 protocol specialists across nine teams. The Hegotá EIP Opinion Post and Tier List represents the Protocol Cluster's first shared tier list covering a single network upgrade. Execution client teams were asked to rank their preferred Hegotá proposals by September 10. The public roadmap currently places Hegotá in 2027, after the Glamsterdam upgrade planned for the fourth quarter of 2026. However, the Foundation framed Hegotá as the fork that decides whether the later post-quantum forks ship on time, with full resistance sitting five hard forks out. Hitting December 2029 would require an average of 7.2 months per fork, a pace the cluster itself calls aggressive. More than ten client teams already run weekly trials, making testing crucial for maintaining the aggressive schedule.
Core developers moved EIP-8141 Frame Transactions from Considered for Inclusion to Scheduled for Inclusion during the August 27 All Core Developers Execution call, giving the proposal a formal place in the planned 2027 Hegotá upgrade. The innovation addresses Ethereum's current requirement that transaction fees must be paid in ETH, allowing apps to pay Ethereum gas for users without requiring them to hold ETH directly. A payments application could therefore pay the ETH fee for a user or accept stablecoins from the user while handling the required ether payment itself, with validators continuing to receive fees through Ethereum's existing fee system. The proposal enables programmable validation that would give accounts more control over transaction verification, potentially allowing Ethereum accounts to replace current signature methods with quantum-resistant authentication without requiring asset transfers to new addresses. Frame Transactions carries that load as the must-ship execution-layer item, opening a path to new signature schemes without a hard fork for each one. EIP-8141 cannot be used on Ethereum mainnet today as its specification remains in draft status while developers continue implementation and testing work ahead of Hegotá's planned 2027 deployment.
Buterin identified changes to state data storage as 'probably the single most disruptive part' of the Lean Ethereum plan. The network currently holds all data, including token balances and smart contract logic, in a single format that is costly to maintain. The revised design would maintain the current system for complex applications while adding a cheaper storage tier for simpler ones. Buterin described a scenario where the cheaper tier could hold 50 times more data than the existing one by 2030, with most tokens, NFTs, and DeFi applications migrating voluntarily while complex systems like automated market makers remain on the current format. A token redesigned for the new tier could see transaction fees fall by more than 10 times without forcing any application to move. EIP-8141 cannot be used on Ethereum mainnet today as its specification remains in draft status while developers continue implementation and testing work ahead of Hegotá's planned 2027 deployment.
