A wearable device includes at least one sensor for obtaining a unique identifier from the wearer when the wearer and for transmitting the unique identifier to one or more computer processors for use in determining whether the wearer is a particular individual. The wearable device may also include a wireless communications device for transmitting a signal (e.g., to a remote computing device) that confirms the identity of the wearer as the particular individual. A remote computing device, or other device, or individual, may then, based at least in part on receiving the signal, grant wearer access to a computer program, computing system, and/or a particular physical space.