How to Verify an Art Certificate of Authenticity
Quick Facts — Art COA
• A COA is a document; it proves nothing on its own — provenance chain does
• Trusted issuing bodies for street art: Pest Control (Banksy), artist studio COAs (Fairey, KAWS), OneCOA (NFC-linked digital), COA with gold holographic seal (Death NYC)
• Trusted bodies for signatures: Beckett Authentication Services (BAS), PSA, JSA
• Red flags: generic COA templates, seller-self-issued COAs, missing edition details, COAs not physically associated with the work
• Blockchain verification: emerging standard; Gauntlet Gallery uses TrueCOA for select works
What Is a Certificate of Authenticity?
A certificate of authenticity (COA) is a document that accompanies an artwork, attesting to its origin, authorship, and often its edition details. In theory, it is proof of authenticity. In practice, a COA is only as trustworthy as the body that issued it. Anyone can print a COA. The document itself proves nothing — the chain of custody and the reputation of the issuer are what matter.
Which Authentication Bodies Actually Matter
Banksy — Pest Control Only
Pest Control is Banksy's official authentication body. If a Banksy work does not have a Pest Control Certificate of Authenticity (PCOA), it has no authenticated value in the secondary market, regardless of any other documentation. Full stop. Pest Control PCOAs include a tear-away authentication card with a unique ID cross-referenced against Pest Control's database.
Gauntlet Gallery note: We do not list or source Banksy works without Pest Control authentication. No exceptions.
Shepard Fairey — Studio COA
OBEY Giant's studio issues COAs for Fairey's signed and numbered prints. These are printed documents with Fairey's signature (not a stamp), edition details, and the OBEY studio seal. Fairey also signs directly on prints in pencil, lower right. For unsigned prints, a studio COA is the primary document.
KAWS — Studio Documentation and OneCOA
KAWS works primarily through his studio. Limited editions from KAWSONE.com or KAWS's galleries come with studio documentation. In the secondary market, OneCOA provides NFC chip verification: a tamper-evident seal embedded in the work's packaging that links to a blockchain-verified ownership record. Gauntlet Gallery uses OneCOA for KAWS and BE@RBRICK figures.
Death NYC — Artist COA with Gold Holographic Seal
Death NYC's premium releases include a gold holographic seal COA signed and dated by the artist. Each COA references the specific edition title, date, and edition number. The gold seal is tamper-evident — removal destroys it. Without the seal and matching edition details, a Death NYC print should be valued as unsigned.
Signed Memorabilia — Beckett, PSA, JSA
For artworks bearing musician, athlete, or celebrity signatures alongside art: Beckett Authentication Services (BAS), Professional Sports Authenticator (PSA), and JSA (James Spence Authentication) are the recognized standards. Each provides a unique certification ID verifiable on their websites. Gauntlet Gallery uses these for applicable music memorabilia.
How to Spot a Fake or Worthless COA
| Red Flag | What It Means |
|---|---|
| COA signed only by the seller | Seller self-authenticated — worthless |
| Generic template with no issuing body listed | Printed in 5 minutes; no verification possible |
| Missing edition details (number, size, year) | Cannot cross-reference against known releases |
| COA not physically associated with the work | May have been separated from a different (or fake) piece |
| Banksy COA from any body other than Pest Control | Not recognized in the market — full stop |
| Holographic sticker that peels cleanly | Genuine tamper-evident seals destroy on removal |
Blockchain COAs: The Emerging Standard
Blockchain-based COAs link a physical artwork to an immutable on-chain record — a token that records provenance, ownership transfers, and authentication events. Platforms including TrueCOA (truecoa.com) issue NFT-linked certificates that buyers can verify directly on the Polygon blockchain. This creates a provenance chain that no paper document can replicate. Gauntlet Gallery uses TrueCOA for select works.
- What should a valid art certificate of authenticity include?
- A valid COA should include: artist name, title of work, year, medium, edition size and number (for prints), dimensions, issuing body name and contact, a unique ID or reference number that can be cross-referenced, and ideally a signature from the artist or an authorized representative of the authentication body.
- Can I trust a COA signed only by the gallery that sold the work?
- Gallery-issued COAs have limited value unless the gallery is the artist's primary representative or an established auction house. A gallery COA for a Banksy, for example, carries no weight — only Pest Control certifies Banksy's work. For street art, always verify the issuing body against the artist's official authentication channel.
- How do I verify a Pest Control COA for a Banksy?
- Pest Control PCOAs include a unique reference number. Contact Pest Control (via their official website) to verify that the reference number matches their records. Do not rely solely on the physical document — counterfeit PCOAs exist and have been documented in the market.
- What is OneCOA and how does it work?
- OneCOA is an NFC-based authentication system that embeds a chip in a tamper-evident seal attached to an artwork or its packaging. Scanning the chip with a smartphone verifies the piece against a blockchain record that includes original sale data, ownership history, and authentication details. It is increasingly used for KAWS figures and BE@RBRICK collectibles in the secondary market.
Every work at Gauntlet Gallery ships with appropriate authentication documentation for its category. Contact us with questions about a specific work's provenance.
