Ever since Jon Watts was given the director’s chair for Spider-Man: Homecoming, he’s had the rare privilege of knowing the complete history of the Marvel Cinematic Universe. No doubt, his contemporaries under the employ of Marvel Studios were also privy to the giant scroll cataloging the events within the MCU, starting from the beginning of time itself. The document, according to Watts’ interview with Entertainment Weekly, spans past the length of a conference table when fully unrolled.
It’s now known that one of the originators of the scroll was Spider-Man: Homecoming co-producer Eric Carroll. His initial job was to help create and support the timeline’s continuity within the MCU. Apparently, the document is kept so hush-hush that the actors themselves can’t take a peek at it.