The premise of the show is that amnesiac Jane Doe has been copiously covered with tattoos by one or conspirators and delivered into the hands of an FBI team. Each week the team "solves" the puzzle of a tattoo or combination of tattoos to find a clue that will lead them to some sort of criminal enterprise: Terrorists buying weapons, terrorists sneaking bombs into New York, cybercrimes, government conspiracies or the like.
We eventually learn that the tattoos were put on Jane by
the terrorist group Sandstorm, and Jane's adoptive mother, and that Jane volunteered to be tattooed and have her memory erased
But it's never explained where the knowledge behind some of the event-based tattoos comes from. Often a tattoo that is at least several months old is "solved" when it produces a number or phrase that ties into an event that's occurring in realtime, such as a series of scores from a college football team or a theft that's just occurred that day.
Initially I thought this strongly suggested that Jane was from the future, and that this was more of a sci-fi series, but her less exotic origins were eventually explained.
So has there ever been any explanation, in or outside of the narrative, how some of the tattoos seem to rely on foreknowledge of events?