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Ethereum's Glamsterdam upgrade set for Sepolia testnet launch on October 6, with warnings of potential testnet attacks.

Protocol Fundamentals
18 Sep 2026
Blockonomi
View Source
Neutral
Ethereum's Glamsterdam upgrade set for Sepolia testnet launch on October 6, with warnings of potential testnet attacks.

Ethereum developers have scheduled the Glamsterdam upgrade to activate on the Sepolia testnet on October 6, following a developer consensus call. This upgrade includes the Enshrined Proposer-Builder Separation (ePBS) feature, which separates block building from validation but raises concerns about potential disruptions from fake builders using cheap test ether to win block auctions and withhold payloads. Developers must release Sepolia-ready software by September 29, leaving only a week for review before the testnet launch. The mainnet activation is still planned for the fourth quarter of 2026, with further testing on the Hoodi testnet expected after Sepolia's performance is assessed.

Ethereum's upcoming Glamsterdam testnet launch is noted alongside a strong market breadth on Pluang, where 47 of 50 major cryptocurrencies rose as of Sep 18, 2026 15:41 WIB. Among notable movers, AAVE gained 9.44% to Rp2.394.884 with 86% buy orders, AXS rose 9.04% to Rp17.813 despite 94% sell orders, and SUSHI increased 9.02% to Rp4.221 with 83% sell orders. This snapshot provides a view of market activity concurrent with Ethereum's testnet developments.

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