1. A method to determine whether a monitored media content presentation corresponds to a reference content source, the method comprising: creating a track corresponding to the reference content source and representative of a history of signature matching results when a first site signature in a plurality of site signatures corresponding to the monitored media content presentation and a first reference signature in a plurality of reference signatures corresponding to the reference content source are determined to match at a particular time offset between the first site signature and the first reference signature according to a histogram representing a plurality of distances between the first site signature and the first reference signature corresponding to a respective plurality of time offsets between the first site signature and the first reference signature; and updating the track to indicate the track is one of still active when a subsequent second site signature in the plurality of site signatures matches a subsequent second reference signature in the plurality of reference signatures at the particular time offset corresponding to the track, or inactive when a number of subsequent site signatures in the plurality of site signatures fails to match at least one subsequent reference signature in the plurality of reference signatures at the particular time offset corresponding to the track.