1. An online auction system comprising: a set of memory resources that store auction data; one or more processors that use the auction data to implement multiple auction forums for transacting a corresponding set of assets, wherein the one or more processors enable a registrant to participate in any of the multiple auction forums by: providing an entity type interface to prompt the registrant to declare an entity type of the registrant; determining a set of requirements for the registrant based at least in part on (i) a type designation provided by a user, and (ii) a geographic region of one or more assets that are being transacted by the multiple auction forums; providing a series of interfaces to the registrant that specify at least one of an action or response from the user for complying with one or more of requirements in the set of requirements.