US Patent 10187754 Time and location-based user tracking and presence confirmation

A method may include obtaining a first indicator of a first location of a user at a first time; identifying the user at the first location at the first time; obtaining a second indicator of the first location of the user at the first time; confirming the first location of the user at the first time by comparing the first and second indicator; storing the first record; obtaining a first indicator of a second location of the user at a second time; identifying the user at a second location at the second time; storing a second record, the second record comprising the second indicator of the second location, a second indication of the second time, and a second indication of the identity of the user at the second location at the second time; and linking the first and second records to create an unalterable alibi of the user.