Presence and authentication for media measurement

A method, comprising:

• receiving, by one or more servers, an audio-based input detected by a microphone of a computing device remote from the one or more servers;
• generating, by a feature recognition engine of the one or more servers, an audio fingerprint based on the audio-based input;
• determining, by an authentication engine of the one or more servers, based on the audio fingerprint, a probability level that the audio-based input is from a registered user of the computing device having a profile stored on the one or more servers;
• receiving, by the authentication engine, input from a second computing device different from and associated with the computing device;
• increasing, by the authentication engine responsive to the input received from the second computing device different from and associated with the remote computing device, the probability level determined based on the audio fingerprint;
• identifying, by the authentication engine and responsive to the probability level increased by the input received from the second computing device and being above a predetermined threshold, an action identified within the audio-based input, the action corresponding to a request by the registered user to activate or control a feature of the computing device;
• selecting, by the authentication engine, a content item based on the action identified within the audio-based input and the profile of the registered user;
• and
• transmitting, from the one or more servers to the computing device, the content item to cause the computing device to present the content item via an output interface of the computing device.