This previous week, simply over 100 Ethereum core contributors gathered above the Arctic Circle — in Longyearbyen, Svalbard — for the Soldøgn Interop: per week of intense work on the Glamsterdam community improve.
Soldøgn adopted final yr’s Berlinterop, however returned to the format utilized by Amphora 🏺, Edelweiss 🏔️, and Nyota ✨: a single-track week of targeted, multi-client progress towards a selected improve — on this case, hardening Glamsterdam.
By Friday, the group had delivered on its three core objectives: alignment on a post-Glamsterdam fuel restrict flooring of 200M, steady ePBS implementations working with exterior builders, and last EIP-8037 repricing numbers locked in. Significant progress was additionally made on Hegotá options like FOCIL and native account abstraction, in addition to a slew of different matters.
Why Svalbard?
Svalbard is without doubt one of the few locations on Earth the place anybody, no matter nationality, can reside and work with out a visa. It is also dwelling to the International Seed Vault and the Arctic World Archive, two cold-storage amenities tunneled into the permafrost exterior Longyearbyen. Between them they maintain backups of crops, books, movies, manuscripts, and supply code that humanity may want a thousand years from now, together with a snapshot of Ethereum’s supply code. Final however not least, from late April via August, the solar does not set in Svalbard. It has 24/7 uptime, identical to Ethereum, which core devs made probably the most of in the course of the week!
Harden Glamsterdam, Scale Ethereum
The week’s objective was to harden Glamsterdam implementations and derive a goal for a post-upgrade fuel restrict flooring. Elevating the fuel restrict safely is a multi-dimensional drawback and Glamsterdam tackles a number of of them: how blocks are constructed and proposed, how a lot headroom shopper implementations have below load, and the way state-creation prices scale alongside throughput.
In apply that meant ending the week with a steady multi-client Glamsterdam devnet working the newest ePBS, repricing and block entry checklist specs, together with benchmarking knowledge to anchor a reputable fuel restrict proposal.
More often than not was spent heads down writing code, typically till the early hours of the morning, punctuated by breakout periods to align on design selections and focus on longer-term roadmap objects.
Three EF groups offered infrastructure for the week: EthPandaOps shipped ethIQ and a panda MCP server to assist groups’ agentic workflows; Protocol Assist arrange soldogn.xyz as the one supply of reality for interop objectives, schedule, and notes; and the EF Digital Studio staff captured the week on movie. Anticipate the very first interop documentary 🔜!
ePBS
Past cleansing up the proposer/builder relationship, ePBS restructures slots by including deadlines for block building, payload reveal, and attestations. This makes express how a lot time might be allotted for execution, rising the top room we’ve to lift the fuel restrict.
Groups kicked off the week aiming for a 4 EL × 4 CL Glamsterdam devnet by Monday night. The primary makes an attempt surfaced sufficient points to push the goal to Tuesday, when a 4×3 configuration ran stably sufficient for stress testing to start.
From there, the remainder of the week was an ePBS hardening cycle: stress take a look at, expose edge circumstances, repair, repeat. A Tuesday-morning Builder API breakout considerably simplified the spec round validator registration, the bid/header/commitments stream, the belief mannequin for builder funds, and circuit-breaker habits. Mid-week debugging zeroed in on cross-client edge circumstances — notably round execution-request invalidation of beacon requests, the place a brand new take a look at suite revealed a spot throughout each shopper implementation. By Thursday morning, CL groups had been reporting steady ePBS whereas EL-side bid pathways had been nonetheless being debugged; these resolved via Thursday into Friday. Two questions stay genuinely contentious for ACD: whether or not a request signature ought to decide to the receiving builder, and hold a 1 ETH-staked-builder design resilient towards P2P Sybil-based liveness assaults.
By Friday, almost all shoppers had been working collectively on glamsterdam-devnet-2 with the exterior builders pipeline examined end-to-end!
BAL Optimizations
If ePBS is the consensus-layer aspect of the Glamsterdam scaling story, the execution layer counterpart has two dominant items: fuel repricings and Block-Degree Entry Lists. By giving shoppers sufficient details about a block’s learn/write arrange entrance, BALs allow parallel execution, batched I/O, and parallel state-root computation, all of which decide how huge a block shoppers can comfortably deal with.
The Soldøgn BAL observe ran by itself devnets, separate from the Glamsterdam ePBS chains, so optimization benchmarks weren’t entangled with consensus-layer stabilization work. Every optimization sat behind its personal function flag so the week’s measurement work may examine them in isolation fairly than as a single bundle. The BAL benchmark dashboard and leaderboard surfaced every shopper’s worst-case eventualities throughout the take a look at suite — by specializing in elevating the slowest paths first, groups may carry the fuel restrict flooring throughout the board, not only for the quickest implementation.
Fuel Repricings
Glamsterdam contains a variety of EL fuel repricings, calibrating prices to raised match useful resource utilization at larger throughput. EIP-8037, the state-creation fuel price improve, sits on the core: it raises the worth of writing new state so {that a} larger fuel restrict does not translate into unbounded state development.
Heading into Soldøgn, the 8037 spec carried dynamic per-state-byte pricing tied to the block fuel restrict, which made testing combinatorially painful (one fuzz matrix per fuel restrict band) and benchmarking almost intractable. Groups agreed early within the week to drop dynamic pricing in favor of a set cost_per_state_byte, with future repricing dealt with at fork boundaries fairly than inside a fork.
The accounting mannequin itself took a extra iterative path. The Monday breakout moved state-gas accounting from mid-execution to end-of-call-frame; a Tuesday follow-up closed out account creation prices, code deposit prices, and CREATE-transaction reverts; Wednesday surfaced reservoir refund/refill edge circumstances that pressured a rethink. The Thursday breakout reverted accounting to opcode degree, having concluded that the actual complexity sat within the reservoir mannequin, not within the accounting computation. By Friday the spec had stabilized on bal-devnet-6, with the BAL observe delivering the ultimate repricing numbers.
This entire arc highlights one of the vital necessary elements of interop: the flexibility to resolve complicated spec, implementation, testing, debugging, and design points in hours as a substitute of weeks. At their finest, interop weeks can compress a month of asynchronous progress into every day!
By Friday, the three threads converged on the headline quantity for the week: a reputable 200M post-Glamsterdam fuel restrict flooring. This important improve is feasible as a result of ePBS constructions the slot to provide execution extra time, BAL optimizations give shoppers the throughput headroom below that construction, and 8037 ensures the upper fuel restrict does not translate into runaway state development.
Different Glamsterdam Threads
Past ePBS, BALs and repricings, many of the remaining Glamsterdam scope was hashed out throughout breakout periods.
CL groups finalized selections on smaller Glamsterdam EIPs: EIP-8061 (exit/consolidation churn improve) was included in glamsterdam-devnet-1; EIP-8080 (exits through the consolidation queue) was declined for inclusion; EIP-8045 (slashed-validator obligation removing) was scoped right down to proposer duties throughout the look-ahead window solely; and EIP-7688 (SSZ steady containers) stays in Glamsterdam scope however is held out of glamsterdam-devnet-1 whereas the staff works via bounded gossip-message measurement for attestations below progressive lists.
A Wednesday-morning EL/CL sync structure breakout deferred EIP-8237 out of Glamsterdam in favor of preserving optionality for a longer-term “top-up sync” structure in a future fork. As a replacement, the room agreed to draft an EIP that normalizes forkchoiceUpdated / newPayload / getPayload sequencing, specifies a snap-sync initiation handshake, and tightens legitimate/invalid consistency between the engine API surfaces.
Hardening was a continuing theme of the week. A Thursday session coated fork-choice compliance testing frameworks, the Diamond repo of reproducible CL edge-case eventualities, and buildoor, PandaOps’s external-builder testing software, demoed mid-session to a protracted stream of assault eventualities attendees advised on the spot.
Past Glamsterdam
A number of breakouts seemed towards Hegotá and the forks that comply with.
A intentionally proposal-agnostic session on native Account Abstraction kicked issues off, working via the necessities and constraints any future design should fulfill. Function-set objectives like various signature schemes, aggregation, batching, restoration, fuel sponsorship, versatile nonces, and keystore wallets sat alongside laborious constraints round public-mempool compatibility, statelessness, and L2 DoS resistance.
A Thursday FOCIL breakout targeted on implementation updates: early prototypes had been already practical, with multi-client interop and a devoted FOCIL devnet because the rapid subsequent steps. Two notable design selections had been additionally made: disabling FOCIL throughout 2-epoch non-finality (mirroring proposer-boost circuit-breaker habits), and adopting an index-based bookmark method for compatibility with body transactions / EIP-7702.
Additional out, a long-running ETH P2P observe sketched a QUIC-based substitute for libp2p with privacy-by-default and slot-aware integration, alongside an erasure-coded broadcast prototype that simulated ~6× quicker propagation than GossipSub on 2.4 MB payloads. The CL observe additionally surfaced robust sentiment towards ultimately deprecating consolidations fully — declaring a last fork that helps them, then forcing exit-then-redeposit afterwards — because the cleaner long-term reply to validator-set state development.
ACD Course of
On Wednesday afternoon, Nixo and Ansgar, the 2 ACDE co-leads, ran a session to gather enter from core contributors in regards to the ACD course of. The session revisited the headliner assemble, debated the professionals and cons of getting a strawmap, and formalized EIP SFI standards. The room broadly wished to maintain headliners however loosen the EIP-vs-theme rigidity, accepting “theme + candidate EIP” as a viable sample. The straw map’s per-fork yr assignments previous 2026 had been flagged as overcanonicalized and more likely to be softened. A brand new four-point SFI definition was put ahead, with ACDT signaling readiness and ACDE/ACDC retaining the ultimate name. A brand new prioritization-ordering course of — produced after CFI selections and mirrored within the meta-EIP — will exchange SFI’s outdated position of driving devnet inclusion, beginning with Hegotá.
On the call-coordination aspect, Alex Stokes introduced he might be taking a three-month sabbatical beginning subsequent week, with Pari overlaying ACDC moderation within the interim and Barnabas filling in for ACDT. All advised: Nixo and Ansgar chair ACDE, Pari is interim on ACDC, and Mario, Barnabas, and Danceratopz rotate ACDT moderation.
All the things Else
Along with all the above, groups used the in-person time to make progress on every little thing from higher take a look at harnesses (compressing Hive suggestions loops from hours to minutes), to engine-API plumbing enhancements (gossip dedup, batched calls, and light-client-driven head discovery), to laborious tradeoffs round shopper variety, and plenty of different matters. The complete checklist of session notes is obtainable at soldogn.xyz.
Subsequent Steps
From right here, groups head dwelling to take what was prototyped in the course of the week and make it production-ready. Anticipate the subsequent a number of weeks to be heads-down on hardening shopper implementations towards the brand new specs, finalizing take a look at protection, and turning Soldøgn’s draft PRs into merged code.
As at all times, the ultimate selections for values such because the 200M fuel restrict goal and last repricing numbers might be made and shared publicly on AllCoreDevs calls. Anticipate these to be the most important matters of the subsequent week!
Thanks very a lot to everybody who got here all the way in which as much as 78°N and made this week successful! Particular shout out to EthPandaOps for whipping the group into form day by day, and to everybody who labored below the midnight solar to verify we hit our each day objectives — together with the Ethrex crew, becoming a member of us for his or her first interop. It was an extremely productive week, and fortunately we’ll have a full quick movie to recollect it by ☀️
