Indiegogo Goes Where Few Companies Dare: Into Initial Coin OfferingsI.C.O.s have been big this year, but few established names have touched them. Indiegogo, the crowdfunding site, is looking to change that.Slava Rubin, one of Indiegogo’s founders, at the crowdfunding site’s offices in New York, Dec. 4, 2017 — Roger Kisby/The New York TimesBy Nathaniel Popper