This game-used base was personally hand-signed by Gary Sanchez on August 26, 2018 vs. the Minnesota Twins with the inscription "1ST WALKOFF HR 4/26/18." It was obtained under the auspices of the Major League Baseball Authentication Program and can be verified by its numbered hologram at MLB.com. It also comes with a hologram from Fanatics Authentic and a certificate of authenticity. To ensure authenticity, the hologram can be reviewed online. This process helps to ensure that the product purchased is authentic and eliminates any possibility of duplication or fraud.