This baseball has been personally hand-signed by corey seager with the inscription "2020 ws champs." it has been obtained under the auspices of the mlb authentication program and can be verified by its numbered hologram at mlb.com. it also comes with an individually numbered, tamper-evident hologram from fanatics authentic. 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.fanatics authentic presented by mounted memoriesincludes tamper-evident hologram to ensure authenticityofficially licensed this product is guaranteed authentic and includes a fanatics certificate of authenticity and an accompanying tamper-evident fanatics hologram.