Officially licensed by Major League Baseball, each MLB artifact is authenticated under the auspices of the MLB Authentication Program and carries a uniquely numbered hologram that allows fans to verify their item at MLB.com. MLB Authenticators witness, log, and adhere holograms to each baseball that comes out of play. Thus the details of each baseball are linked to a unique hologram number in this online database. a tamper-evident hologram sticker is adhered to each artifact to ensure authenticity.