Services for authenticating items using item related data; Services for registering ownership of items; Services for capturing stolen and counterfeited items related data; Services for listing and managing inventory of items; Services for tracking and reporting item related activities; Services for authenticating items within commercial transactions; Services for certifying authenticity of items; Services for validating registration of items; Services for controlling listing of items on electronic market databases using item related authentication data; Data processing services, namely, compilation of information into a computer database to authenticate items and to control listing of items on electronic market databases