An online auction system includes a set of memory resources that store auction data and one or more processors. The one or more processors implement multiple auction forums for transacting a corresponding set of assets. The one or more processors enable a registrant to participate in any of the multiple auction forums by providing the registrant with multiple interfaces to prompt the user for input or action. In some embodiments, the one or more processors provide an entity type interface to prompt the registrant to declare an entity type of the registrant. The one or more processors operate to determine a set of requirements for the registrant based at least in part on (i) a type designation provided by the user, and (ii) a geographic region of one or more assets that are being transacted by the multiple auction forums.