If you're buying sports memorabilia, you've probably heard the term Certificate of Authenticity (COA) countless times. But what exactly does it mean, and how does it work?

A Certificate of Authenticity, often called a COA, is simply proof showing who authenticated an autograph or collectible. It tells collectors which authentication company examined or witnessed the signature so they can verify the item's authenticity.

Modern authentication has become far more secure than it was years ago, giving collectors greater confidence when buying autographed sports memorabilia.

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Paper COAs Are Mostly a Thing of the Past

Throughout the 1990s and even into the early 2000s, most certificates of authenticity were simply pieces of paper.

The problem?

Nothing physically connected that paper certificate to the signed item.

A paper COA could potentially be separated from one autograph and paired with another item. Because of this, paper certificates became much less reliable as the hobby grew.

Modern authentication companies solved this problem by attaching authentication directly to the collectible itself.

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How Certificate of Authenticity Verification Works

Nearly every major authentication company uses a tamper-evident hologram that's permanently attached directly to the signed item.

The hologram contains:

• A unique certification number
• Often a QR code
• Security features designed to prevent counterfeiting

When you scan the QR code—or manually enter the certification number on the authentication company's website—you'll be taken directly to that item's verification page.

Major authentication companies include:

• Beckett Authentication Services (BAS)
• James Spence Authentication (JSA)
• PSA/DNA Authentication

Their databases typically display information such as:

• Athlete's name
• Item type
• Authentication number
• Authentication status
• Witness information (if applicable)
• Date and location (for many witnessed signatures)

This makes verifying sports memorabilia easier and more secure than ever before.

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What Is a Letter of Authenticity (LOA)?

A Letter of Authenticity (LOA) is different from a standard Certificate of Authenticity.

Rather than simply attaching a hologram to the item, the authentication company provides a detailed document that includes:

• The authentication company's opinion
• The certification number
• A description of the item
• A photograph of the exact signed item

That photograph is extremely valuable because it permanently connects the autograph to the document.

If someone attempted to switch the certificate to another item, the photograph would immediately expose the mismatch.

LOAs are commonly issued after an item has been submitted to companies like:

• Beckett Authentication
• JSA Authentication
• PSA Authentication

for expert autograph examination.

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Why Modern COAs Are More Secure

Modern authentication systems provide multiple layers of protection.

Instead of relying on a paper document, collectors can verify:

• The physical hologram
• The certification number
• The authentication company's online database
• Often a QR code
• In many cases, witness information
• For LOAs, an exact photograph of the signed item

These improvements make modern authentication significantly more secure than the paper certificates commonly used decades ago.

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Does Every Authenticated Item Come With a Letter of Authenticity?

No.

Many witnessed autographs receive only a hologram and an online database entry.

A Letter of Authenticity is generally issued when an item has been submitted for an expert opinion rather than being witnessed during the signing event.

Both methods are legitimate forms of authentication, but an LOA provides additional documentation by including a photograph of the exact item.

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Why Authentication Matters

Authentication helps collectors:

• Buy with greater confidence
• Verify ownership history
• Reduce the risk of counterfeit autographs
• Improve resale confidence
• Support long-term collectible value

Whether you're collecting signed baseballs, jerseys, helmets, trading cards, photos, or tickets, authentication has become one of the most important parts of the modern sports memorabilia hobby.

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Final Thoughts

A Certificate of Authenticity (COA) is simply a way of identifying who authenticated a piece of sports memorabilia.

While paper COAs were once common, collectors now rely on secure holograms, QR codes, unique certification numbers, and online databases from trusted companies such as Beckett Authentication, JSA Authentication, and PSA Authentication.

For items authenticated after expert review rather than witnessed in person, a Letter of Authenticity (LOA) provides even greater confidence by including a photograph of the exact signed item.

Understanding how these systems work can help you buy, sell, and collect autographed sports memorabilia with confidence.

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Frequently Asked Questions

What is a Certificate of Authenticity (COA)?

A Certificate of Authenticity (COA) identifies the authentication company that verified a signed collectible and allows collectors to confirm its authenticity.

What does COA stand for?

COA stands for Certificate of Authenticity.

Are paper certificates of authenticity still used?

Paper-only COAs are largely obsolete. Most major authentication companies now use holograms, QR codes, and online verification systems that are attached directly to the item.

What companies authenticate sports memorabilia?

The three most recognized authentication companies are Beckett Authentication (BAS), JSA Authentication, and PSA Authentication (PSA/DNA).

How do I verify a certificate of authenticity?

Scan the QR code if one is present or enter the certification number on the authentication company's website to verify the autograph or collectible.

What is a Letter of Authenticity (LOA)?

A Letter of Authenticity (LOA) is a detailed authentication document that includes the certification number, item description, and often a photograph of the exact signed item.

Is a Letter of Authenticity better than a COA?

Not necessarily. Both serve important purposes. However, an LOA provides additional documentation because it includes a photograph of the authenticated item.

Can authenticated sports memorabilia still be faked?

Unfortunately, yes. Counterfeit holograms do exist. That's why you should verify the hologram, certification number, online database entry, and compare the autograph itself to known authentic examples whenever possible.

Do all authenticated items have QR codes?

Many modern authentication stickers include QR codes, but not every authentication company or every generation of holograms does.

Why is authentication important for sports memorabilia?

Authentication helps collectors verify authenticity, reduce fraud, increase buyer confidence, preserve resale value, and confidently build a collection of authentic sports memorabilia.