Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for verifying content distribution authority. In one aspect, a method includes receiving a request for broadcast content for a broadcast feed from a requestor. In response to the request, specifying verification content for inclusion in the broadcast feed, the verification content being scheduled for presentation at a specified time. The broadcast feed is monitored for presentation of the verification content at the specified time. In turn, a determination is made whether the verification content was presented by the broadcast feed at the specified time. In response to determining that the verification content was presented by the broadcast feed at the specified time, the requestor is verified as an entity having content distribution authority over the broadcast feed.