Right before Roger was executed, he introduced to the world this great treasure may very well be claimed by anyone who could get to it, thereby starting up the Great Age of Pirates.
Immediately after many years of speculations and uncertainties, the treasure's existence was confirmed by Whitebeard with his final breath. He pointed out that "a grand fight will engulf all casino the earth" and "the whole world will be shaken to its core" when the 1 Piece is identified.[6]