One embodiment of the present invention provides a system that uses digital signatures in a novel configuration to perform validations to facilitate a trade. Each pixel element includes a first substrate, a second substrate and an optical filter portion. The reports include common data that is common to the multiple reports. The present invention is also related with use of the antibodies for therapeutical and diagnostic purposes. In one exemplary embodiment, the method may comprise running one or more diagnostic tests on a residential gateway using a module of the residential gateway, storing a diagnostic test result, analyzing the diagnostic test result, and performing one or more corrective actions in response to the diagnostic test result.