Seattle-based Mpire, which provides online advertising verification and optimization technology, said yesterday that it has signed three ad network partners. According to Mpire, it added Digital Broadcasting Group (DBG) Video Network, a digital video network, Dedicated Media, a display ad network, and XA.net, a ad serving firm, as partners. The firm said all three will use its AdXpose campaign verification, optimization, and brand protection product. Financial details of the partnerships were not disclosed. Mpire is backed by Draper Fisher Jurvetson and Ignition Partners.