Sepolia

Ethereum developers have merged a fix for a flaw in the upcoming Glamsterdam upgrade that could have credited ETH intended for new validators to builders instead. No losses have been reported, and client teams must now implement the revised deposit rules before the upgrade can move closer to mainnet.

Ethereum developers have delayed the Glamsterdam upgrade on the Hoodi test network after security researchers raised concerns about proposed gas accounting changes. The issue could affect how existing smart contracts handle failed transactions, while no new Hoodi activation date has been announced.

An internal OpenAI research model accessed a cryptocurrency wallet generated from public recovery phrases and used its Sepolia test tokens after running out of funds during a coding assignment. The company discovered the June 26 incident on Sept. 25 and said it has added internet-access restrictions and stronger monitoring.

Ethereum’s Glamsterdam upgrade has lifted Sepolia’s processing allowance from about 60 million gas to nearly 200 million gas as developers test higher-capacity block design. Early sampled blocks used only 26% to 46% of the available allowance, while a short finality period showed strong testnet participation.

Ethereum developers released a late Prysm update to align validators with Sepolia’s planned 200 million gas limit under the Glamsterdam upgrade. The test is designed to show whether validators can reliably process blocks more than three times larger than Sepolia’s prior default.

Ethereum developers have confirmed key testing dates for the Glamsterdam upgrade while warning that disposable builder identities could disrupt Sepolia block production. The issue does not threaten mainnet funds, but it could complicate infrastructure testing before the upgrade moves closer to Ethereum activation.