Glamsterdam heads to testnets

EF blog: Glamsterdam testnet announcement

. Sepolia activates at epoch 353,024, slot 11,296,768 (October 6, 13:53:36 UTC); Hoodi and mainnet are undecided. The headliners are ePBS (EIP-7732) and block-level access lists (EIP-7928). On gas, EIP-8037 raises and separately meters the cost of creating state and EIP-8038 updates state access costs, alongside changes to intrinsic transaction gas (EIP-2780), calldata, access lists and block gas accounting without refunds (EIP-7778). The announcement warns that contracts relying on fixed gas stipends, hardcoded gas limits or remaining-gas assumptions may need changes, and links a repricing impact guide.

https://blog.ethereum.org/en/2026/09/17/glamsterdam-testnet-announcement 2026-09-17

EIP-8365: BLS withdrawal credential retirement

Was merged as a draft, proposing to retire the 0x00 withdrawal credential type.

https://github.com/ethereum/EIPs/pull/12097 2026-09-17

Faster blocks

barnabemonnot: after a month of outreach, Ethlabs ships a major piece on faster L1 blocks

20:21; binji: publishing an article that took a lot of work via the Ethlabs account, 16:51; Derek Chiang: the two did not handwave but made a careful case for quick slots (EIP-8198), 21:00.

https://x.com/barnabemonnot/status/2100575903461839032 2026-09-17

binji: publishing an article that took a lot of work via the Ethlabs account

Barnabemonnot: after a month of outreach, Ethlabs ships a major piece on faster L1 blocks, 20:21; binji: publishing an article that took a lot of work via the Ethlabs account, 16:51; Derek Chiang: the two did not handwave but made a careful case for quick slots (EIP-8198), 21:00.

https://x.com/binji_x/status/2100523127864275047 2026-09-17

Derek Chiang: the two did not handwave but made a careful case for quick slots (EIP-8198)

Barnabemonnot: after a month of outreach, Ethlabs ships a major piece on faster L1 blocks, 20:21; binji: publishing an article that took a lot of work via the Ethlabs account, 16:51; Derek Chiang: the two did not handwave but made a careful case for quick slots (EIP-8198), 21:00.

https://x.com/decentrek/status/2100585746340147342 2026-09-17

Julian Ma: fast confirmations can speed up L1-to-L2 deposits and ZK proofs can speed up L2-to-L1 withdrawals, but slot time is the smallest unit of time affecting everything

20:14.

https://x.com/_julianma/status/2100574109482557865 2026-09-17

ethresear.ch: EIP-8411, what segmented payload diffusion is made of

10:41 (cskiraly). Payload propagation is fast enough today largely because blocks are small and datacenter builders and high-bandwidth nodes carry it; EIP-8411 uses message segmentation so pieces pipeline through the network, and the only consensus change is a Merkle tree commitment in the bid.

https://ethresear.ch/t/eip-8411-what-segmented-payload-diffusion-is-made-of/26025 2026-09-17

Other updates

nero_eth: Glamsterdam is coming in hot, and the unlock for users will be huge

00:05.

https://x.com/nero_eth/status/2100269849784316158 2026-09-17

EIP-7928: align BAL retention with the history expiry window

.

https://github.com/ethereum/EIPs/pull/12347 2026-09-17

EFDevcon: Justin Drake will speak on post-quantum Ethereum at Devcon 8

21:25.

https://x.com/EFDevcon/status/2100591856941731945 2026-09-17

Community

Vitalik: it is increasingly common to say AI hacking dooms cybersecurity, and he disagrees, arguing cybersecurity is naturally defense-favoring

04:34.

https://x.com/VitalikButerin/status/2100337594722890145 2026-09-17

preston_vanloon: why launch a proof-of-authority L1 EVM chain when you could launch an L2 with Ethereum's security

08:20.

https://x.com/preston_vanloon/status/2100394331290874158 2026-09-17