6:15 AM PT -- 10/26 Brady announced on Monday night he's sweetening the pot even further for the Bucs fan ... saying he's giving the dude a full bitcoin as part of the negotiation process.
TB12 revealed the deal to Peyton and Eli Manning on their "Monday Night Football" Manningcast, telling the brothers, "At the end of the day, I think he's still making out pretty well."
FYI -- one bitcoin is currently worth roughly $62,000 ... which still ain't $500k, but at least it's getting closer!