In order to protect the legacy of Ilija Bašičević Bosilj and Dimitrije Bašičević Mangelos, Ilija & Mangelos Foundation issues the certificate of authenticity for their art works.

Certificate of Authenticity contains an image and a precise description of art work, creation year, size, technique, identification number and certificate number. The president of the Foundation signs a certificate and verifies it with the seal of the Foundation.

Authenticity of the work is guaranteed by direct inheritors of the two artists, dr Vojin Bašičević and dr Ivana Bašičević Antić, who examine each painting, serigraphy or graphic.