Provided are platforms, systems, and software for verifying a user-agent comprising: a software module configured to transmit a quiz to an unverified user-agent, the quiz comprising at least one user-agent verification question drawn from an inventory of user-agent verification questions; a software module configured to receive a response to the quiz, the response comprising a reported user-agent and a result for each question; and a software module configured to compare each result to a result expected from the reported user-agent to verify the reported user-agent. Also provided are methods of using the same.