Television transmissions are received at multiple locations across a large area. Advertisements may be identified, harvested and tagged from within in the television transmissions. The advertisements may be assigned identifiers; media plans may be determined. A datastructure of observed advertisement sequences may be created; the observed advertisement sequences may be determined to have a probability of being unique above a threshold. The smart TVs may render broadcast content and may report advertisement and/or content identifiers. Reported advertisement sequences may be determined and compared to the datastructure of observed advertisement sequences to identify and/or confirm content rendered by the smart TVs.