A system for providing a remote service including selecting a reference item, selecting a specification of the reference item, evaluating the specification against alternatives to the reference item, determining interchangeability between the reference item and alternatives based on the evaluating of the specification in relation to the alternatives, where the determining of interchangeability is based on or includes determining at least one of quasi-fungibility and quasi-anti-fungibility. The method further including forming at least one set based on the determined interchangeability and providing a remote service based on or including at least one of the set and at least one member of the set.