Ethereum schedules Glamsterdam test for Oct 6, developers warn of potential block builder attacks

Ethereum plans to launch the Glamsterdam upgrade test on the Sepolia testnet on October 6. Developers have warned that attackers could disrupt the process by using free testnet ETH and temporary block builder identities to win auctions at high prices while refusing to submit transaction payloads. While this risk does not affect mainnet funds, it could hinder upgrade validation. Glamsterdam aims to increase the block gas limit to approximately 200 million, with no mainnet launch date set yet.