1. A method for searching for metadata relating to media content, the method comprising: receiving, from a first computing device, a content signal; transforming the content signal into two or more different hash formats to derive digital watermark data embedded in the content signal, and using the digital watermark data to retrieve metadata for the content signal, wherein the two or more different hash formats correspond to different databases, and wherein the databases store hashes of content signals and corresponding identifying information; using the two or more different hash formats to determine identifying information from the corresponding databases; and based in part on the identifying information, retrieving metadata for the content signal.