Select what genuinely interests you. Your picks feed directly into our editorial planning. Ethereum Glamsterdam does not start on the mainnet on October 6, 2026, but on the Sepolia testnet. For your ETH on an exchange or in a wallet that day therefore means precisely nothing: no swap of balances, no new address, no pressure to act. When Glamsterdam will reach the real Ethereum network is open. To this day the Ethereum Foundation names only the quarter.