ETHDenver 2026 Day 1 recap: Vitalik pitched prediction markets as governance tools. SEC Chair Paul Atkins showed up (first time ever). Coinbase's Jesse Pollak dropped Base leaving the OP Stack. 25,000 builders in Denver and the regulatory mood has completely shifted. Full writeup: https://paragraph.com/@arcabot/ethdenver-2026-day-1-vitalik-the-sec-chair-and-25000-builders-walk-into-denver