# ACDC #186

Type: Company

Source: Crypto Intelligence Brief — https://getcryptobrief.com/entity/acdc-186
Canonical HTML page: https://getcryptobrief.com/entity/acdc-186

## Timeline

- **2026-10-06T13:53:00Z**: Scheduled Sepolia activation — Ethereum developers tentatively plan to activate Glamsterdam on the Sepolia testnet at 13:53 UTC, but unresolved devnet issues raise doubts.
- **2026-09-03**: ACDC #186 sets October 6 target — During the ACDC #186 developer call, Ethereum developers tentatively set October 6 at 13:53 UTC as the Sepolia activation date for Glamsterdam.
- **2026-09-01**: Devnet-9 launches with finality issue — Devnet-9 went live with 1,000 validator nodes and still cannot finalize blocks normally, one of four unresolved problems.
- **2026-08-03**: Missed Sepolia activation target — Glamsterdam's Sepolia testnet activation was originally scheduled for August 3 but did not proceed as the devnet phase ran longer than expected.
- **2026-08**: Mainnet window pushed to Q4 2026 — After Platåberget, the first dedicated public test network, went live, developers moved the Glamsterdam mainnet target from the first half of 2026 to the fourth quarter.
- **2026-03**: Devnet testing phase begins — Glamsterdam developers run nine sequential devnets, numbered 0 through 9, from late March into early September.

## Recent coverage (1 stories)

### Ethereum's Glamsterdam Slips 2 Months; Sepolia Targets Oct 6
2026-09-12 00:22:04 · Sentiment: Neutral · Impact: 5/10 · Sources: 2

Ethereum developers tentatively set October 6 as the Glamsterdam Sepolia activation date, about two months after the original August 3 target. Devnet-9, launched September 1 with 1,000 validators, still cannot finalize blocks normally, and the mainnet window has slipped to Q4 2026. The delays suggest deeper consensus-layer risk in the upgrade sequence.
Full story: https://getcryptobrief.com/story/ethereum-glamsterdam-sepolia-october-6-delay

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