Tools and techniques facilitating transactions in real estate and other notes are described. Nonperforming notes and subperforming notes, for example, are described and managed in consistent ways despite differing origins. A single point of contact can be specified for each seller to avoid confusion and miscommunication. Investor performance and other behavior can be tracked and reported in an online marketplace. Investors can be automatically or partially automatically prequalified as a condition of participation in some or all aspects of the online marketplace. Bids can be automatically ranked according to how well they match a seller's criteria, and notes can be automatically ranked according to how well they match a buyer's criteria. Encryption, authentication and other security measures can be used throughout the system and its activities to maintain confidentiality of the information that is provided by sellers, by buyers, or by modules of the system.