Meet Aspen Digital Token, a new asset-backed coin on Ethereum. : The owners of the St. Regis Aspen Resort in Aspen, Colo., have begun to sell real estate security tokens on a blockchain with help from Indiegogo, a crowdfunding site. “We think we have a once-in-a-lifetime opportunity to create a bench mark for what real estate tokenization looks like,” said Stephane De Baets, founder and president of Elevated Returns, owner of Aspen’s St. Regis and other hotel properties.