• Beckett - https://www.beckett-authentication.com/
• Fanatics - https://www.fanaticsauthentic.com/verify-authenticity/x-391716+z-95228376-3107284990
• GAI - https://www.globalauthentics.com/certcheck/main.asp
• GFA - http://gfaauthentication.com/certcheck
• JSA - https://www.spenceloa.com/verify-authenticity
• Leaf Authentics - https://leaftradingcards.com/leaf-authentics-memorabilia/
• MLB - https://www.mlb.com/official-information/authentication
• Mounted Memories - https://www.mountedmemoriesauthentic.com/FanaticsAuthenticate.aspx
• Prova - https://prova1.provagroup.com:9443/provaserver/legit/lookup
• PSA/DNA - https://www.psacard.com/cert/
• Radtke - https://www.radtkesports.com/authentication
• Sports Mix - https://www.thesportsmix.com/authentication.php
• Steiner - https://www.steinersports.com/authenticity/x-23346787+z-9573063-2225939671
• TriStar - http://www.tristarauthentic.com/
• Upper Deck - http://sports.upperdeck.com/memorabilia/hologram_lookup.aspx?visited=1

Certificate Authority Website Info Links: 

• A.P.E. - http://athleticpromotionalevents.com/about.htm
• AAC - https://www.allamericanclassics.org/
• AIV - https://ai-verified.com/
• Anderson Americana - https://www.andersonauthentics.com/pages/about-us
• Athlon - https://shop.athlonsports.com/
• Authentic American Collectibles - http://www.aaasportsmemorabilia.com/authentication-process/
• Authenticated Ink - http://authenticatedsignedink.com/
• Denver Autographs - https://www.denverautographs.com/about-us/
• Famous Ink - https://www.famousink.com/authenticity
• Gameday Sports - https://gamedaysportsmemorabilia.com/authenticity-guarantee/
• Great North Road America - https://www.bobbyorr.com/
• GTSM - http://gtsportsmarketing.com/
• MAB - https://mab-celebrity.com/about-us
• Mill Creek Sports - http://www.millcreeksports.com/authentication/
• Panini Authentic - https://www.paniniamerica.net/
• RR Auction - https://www.rrauction.com/RR-Auction-Authentication
• Stan Lee Collectibles - https://shop.therealstanlee.com/