A Certificate of Authenticity (COA) is an official document or label that accompanies an artwork to verify that it is genuine and authentic. The certificate may include details such as the artist's name, title of the work, date of creation, media used, and a unique identification number. It also serves as a legal document and can be used for proof of ownership or to increase the artwork's value. COA�fs are issued by publishers, artists or galleries. https://www.gallerydirectart.com/