Implied probability is the break-even chance this price pays for, margin included. It is not a vig-free or fair probability.
A confirmation is a re-read that found no change; it is never counted as movement. First observed is the earliest state CuratedBets recorded, not the book's first price.
First observed is the earliest state CuratedBets recorded for this exact wager — not the sportsbook's first price. Last changed is when price, line or availability last moved; last confirmed is when a sweep re-read it and found it unchanged. Final pregame appears only once kickoff has passed and is the last state we observed, with its lead time shown beside it.