Ethereum Sets Glamsterdam Test Date, Flags Fake-Builder Risk

Glamsterdam is a planned Ethereum protocol upgrade that must pass public testnet trials before developers can assess its readiness for mainnet deployment. Testing on Sepolia gives client teams a controlled environment to examine compatibility and network stability. Yet the availability of free test tokens and the ease of creating false identities also leave the network exposed to malicious builders seeking to disrupt block production and delay the upgrade process.

Ethereum developers have scheduled the Glamsterdam trial on the Sepolia testnet for Oct. 6, while leaving the mainnet launch date undecided. They warned that attackers could use free test tokens and fake identities to slow or even stall the test chain. The threat does not put mainnet funds directly at risk, but it adds urgency to efforts by client developers to identify and exclude malicious builders before the upgrade advances.