Why Certificates of Authenticity Matter
A Certificate of Authenticity (COA) is the contemporaneous document in which the seller states what the work is, issued by the party in a position to know.
No general statute obliges a private sale of a unique work to carry one. Multiples are a different question, and a previous version of this guide over-corrected by denying it. Several US states impose written-disclosure duties on dealers selling prints, photographs, sculpture casts and other multiples — New York's Arts and Cultural Affairs Law article 15 and California Civil Code section 1740 and following are the two most often cited, and both attach above a stated dollar figure. The figures, the covered media and the required disclosures differ by state and are amended; check the current text of the statute where you sell, or ask your lawyer once. What remains true is that there is no single national threshold, so treat any unsourced figure with suspicion — including one repeated back to you by a search engine.
Three parties ask for a certificate anyway, whether or not a statute requires it: the buyer's insurer when the work is scheduled onto a policy, the auction specialist assessing a consignment years later, and the executor handling the work when it passes through an estate.
A properly issued COA:
- Protects the buyer's investment
- Supports insurance claims in case of damage or theft
- Establishes provenance for future resale
- Demonstrates gallery professionalism
The 9 Essential Elements
1. Artist Full Legal Name
Not just a signature — the artist's complete legal name as it appears on official records.
2. Title of the Work
The exact title, including "Untitled" if applicable. Avoid abbreviations.
3. Date of Creation
The year the work was completed. For works created over multiple years, use the range (e.g., 2024–2026).
4. Medium and Materials
A precise description: "Oil on Belgian linen" not just "oil painting." Include any unusual materials.
5. Dimensions
Height × Width × Depth in both inches and centimeters. Specify whether dimensions include the frame.
6. Edition Information
For prints and multiples: edition number (e.g., 3/25), plus AP (artist's proof) designation if applicable.
7. Unique Identifier
A catalog number, inventory code, or registration number that ties the COA to the specific work.
8. Artist or Authorized Signature
A hand signature or authorized representative's signature. Where a certificate is issued digitally rather than on paper, some issuers publish a cryptographic hash of the document so a recipient can prove the file has not been altered. Gilded Art Works does not do this — the certificates it generates carry a unique document number, not a hash — so treat it as a practice worth knowing about rather than as something this checklist claims for itself.
9. Date of Issue
The date the certificate was created, distinct from the date of the artwork itself.
3 Common Mistakes That Undermine Credibility
1. Vague medium descriptions. "Mixed media" tells the buyer nothing. Be specific: "Acrylic, oil pastel, and gold leaf on wood panel."
2. Missing dimensions. A COA without dimensions cannot be used for insurance purposes, which defeats one of its primary functions.
3. No unique identifier. Without a way to match the COA to the specific artwork, it has limited legal value.
Professional COA Standards
Gilded Art Works prints the artist, title, year, medium and dimensions for every work listed, the artwork image on the face of the certificate, a unique document number in the form GA-2026 followed by twelve hexadecimal characters, the date of issue, and one signature line for your authorized representative. Edition information goes in the medium field — write "Archival pigment print, edition 3 of 12" — because the artwork record carries no separate edition field, and anything you leave out of medium does not appear on the certificate. Generate a certificate of authenticity now — and pair it with a documented ownership chain; our guide to provenance record keeping covers how the two work together.