One night a year, the whole room writes a prediction about the year ahead and seals it. Twelve months later, on the next Predictions Night, every seal in the building opens at once — and we all find out who actually saw it coming. The ultimate Ledger entry: no edits, no hindsight, a full year of reality as the judge.
The desk opens the window once a year (and announces it on the Wire and by email). Until then, you can still seal a take on any individual story the moment it's developing — that seal opens when that story resolves. Sharpen up while you wait.
Memory is the enemy of honest scorekeeping — everyone "knew it all along." A sealed take can't be quietly upgraded or forgotten. It's the same mechanism the room uses on developing stories (the Toolkit explains it), pointed at the biggest clock there is: the year.