In an episode from the eighth season, My Sister, My Sitter, first aired on 2 March 1997, the show neatly presents Homer and Marge on a date outside the Crypto Barn, outside of which a slogan casually states, A place for codes.
While perhaps designed to be part of the neighborhoods less illustrious infrastructure, selling spy equipment in addition to these generic codes, its echoing of todays cryptocurrency outlets is uncanny.