Glamsterdam lands on Hoodi at epoch 132,352 on October 26

Glamsterdam has a clock time, and it is not a mainnet clock. On October 16, 2026, the Ethereum Foundation Protocol Cluster scheduled the upgrade for the Hoodi testnet at epoch 132,352, slot 4,235,264 — October 26, 2026, at 17:42:48 UTC — and left Ethereum (ETH) mainnet marked TBD. The cell that matters is the empty mainnet row. The Foundation has not published a mainnet activation time.

The Hoodi instant is exact. The Foundation's activation table pairs epoch 132,352 with slot 4,235,264 and UNIX timestamp 1793036568. The slot is arithmetic, not a second estimate: 132,352 epochs times 32 slots is 4,235,264, and that timestamp converts to 17:42:48 UTC on October 26. The Hoodi network configuration carries the same pair, with GLOAS_FORK_EPOCH set to 132352 and a gas limit of 200,000,000 at that epoch. Sepolia already took Glamsterdam on October 6, 2026, at epoch 353,024, slot 11,296,768, 13:53:36 UTC. Hoodi's gas limit rises to 200 million at the same epoch, matching Sepolia. Mainnet on that table is still TBD for epoch, slot, UTC time and UNIX timestamp.

What Hoodi is actually turning on

Glamsterdam pairs the Amsterdam execution-layer upgrade with the Gloas consensus-layer upgrade. The two changes that alter block production are enshrined proposer-builder separation (ePBS) in EIP-7732 and block-level access lists (BALs) in EIP-7928. A proposer posts a builder's commitment, the builder reveals the execution payload later, and the protocol pays the proposer instead of trusted middleware. BALs list the accounts and storage a block touches, so clients can read state and validate in parallel. EIP-8037 raises the cost of creating state, EIP-8038 updates state-access costs, and the gas-limit schedule in EIP-8261 lifts Hoodi to 200 million gas. Exit and consolidation churn also increases.

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The earlier testnet announcement had left Hoodi and mainnet undecided, and it cast Glamsterdam as the fork after Fusaka on the Layer 1 (L1) scaling path. The October 16 post fills only the Hoodi row. It says the mainnet time will be announced once client teams decide, and it states: "This announcement covers Hoodi; it does not schedule a mainnet upgrade." Mainnet users, ETH holders and mainnet node operators are told to do nothing because of this note.

Who has a Hoodi build, and who does not

Hoodi operators do not get that pass. Before 17:42:48 UTC on October 26, 2026, a node needs an execution client and a consensus client whose release notes explicitly confirm this activation. The Foundation's client tables list Grandine 3.0.0-rc.1, Lighthouse v8.3.0, Lodestar 1.50.0, Nimbus 26.10.1, Prysm v7.3.0 and Teku 26.10.1. Grandine's tag is still a release candidate. Execution lists Besu 26.10.0, Ethrex 30.0.0, Erigon v3.8.0, Nethermind 2.2.0 and Reth v2.8.0. The go-ethereum row has neither a version nor a download, so there is no confirmed Geth build to move to. A node that does not support the new rules cannot follow the upgraded network after the slot. Tooling shows only commit-boost 0.12.0-rc1.

Dmitry Gusakov, head of engineering at Lido, wrote on the October 15 All Core Devs Consensus issue: "We still need to do a lot of testing with real builders on Hoodi." Hoodi stakers must update the beacon node and the validator client, review the new duties and set the gas limit they will target. Mainnet staking desks are in another queue. Nothing here turns a custody project such as BNY Mellon adding staking, with Galaxy running validators, into a Hoodi job on October 26.

Gas rules before any mainnet slot

Contracts that hard-code a gas stipend or leftover gas can mis-estimate once EIP-8037 and EIP-8038 are live. The Foundation wants that tested on Sepolia and on Hoodi, including issuers filing tokenised funds on Ethereum such as BlackRock's BSTBL and BRSRV filings. There is no mainnet epoch to accept. Higher exit churn will matter to operators watching how the ETH exit queue behaves, but on Hoodi it is only a testnet setting. This is also not a Layer 2 (L2) revenue story. Blast's wind-down says an L2 could not cover its costs. It does not say whether Hoodi can validate 200 million gas blocks with real builders. The multi-year redesign in the Lean Ethereum notes from Vitalik Buterin is a research horizon, not this slot.

What happens next does not require a mainnet date. Operators who skip the update fall off Hoodi at slot 4,235,264. Still open are a go-ethereum build, builder tooling past a release candidate, and whether real builders reveal payloads on time. Until a separate Foundation post names a mainnet slot, there is no mainnet date.

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