CANNES — Wall Street's new plumbing is being built on Ethereum and this week its architects descended on the same French Riviera villas and red carpet venues that host the Cannes Film Festival in May.The Ethereum Community Conference, or EthCC, transformed the beachside town into a hub for crypto founders, developers, and the institutional giants now building atop the infrastructure. The crypto elite climbed the iconic steps of the Palais des Festivals — a cinematic landmark typically reserved f...