The authenticity can be verified on Beckett Authentication Services website. This Autographed 3x5 Index Card has been Personally Signed by Donnie Wahlberg of New Kids On The Block. This item is 100% Authentic to include a hologram by Beckett Authentication Services. This item will come with an affixed Beckett Authentication Services (BAS) authentication sticker, which includes a scannable QR code to verify authenticity. Please note that Beckett no longer provides serial-numbered COA cards, and the attached BAS sticker will serve as the complete authentication for this item. The authenticity can be verified on Beckett Authentication Services website.