These shorts were worn and personally hand-signed by Leonardo Santos. They are officially licensed by the UFC and come with a individually-numbered Certificate of Authenticity from Fanatics Authentic. The Certificate of Authenticity is signed by Senior Director Chad Hurley and a UFC equipment manager. To ensure authenticity, the item can be verified online using the Certificate of Authenticity's unique alpha-numeric code. This process helps to ensure that the products purchased are authentic and eliminates any possibility of duplication or fraud.