PSA/DNA

PSA/DNA is the autograph authentication arm of Professional Sports Authenticator (PSA), a leading United States third-party authentication company established in 1991 and operating under Collectors Holdings, Inc. It is a premium-tier authenticator of signed sports memorabilia. For collectors, PSA means PSA/DNA here: the authentication of signed shirts and memorabilia, not the trading-card grading the wider PSA business is best known for.

How PSA/DNA authenticates

PSA/DNA launched in 1999 and authenticates a signature through a structured four-step examination, comparing it against known authentic exemplars and applying forensic analysis. For signed memorabilia it can also apply PSA/DNA's tamper-evident DNA-marker, an invisible synthetic marker that ties an item to its certification. There is no single named authenticator; PSA/DNA operates as a bureau, and its certification rests on that process rather than on one signer.

What you receive and how to verify it

Independent verification is the point: any PSA/DNA certificate can be confirmed by its number on PSA's own Certification Verification page, psacard.com/cert, without trusting Walkouts.

Where the number sits. A shirt authenticated by PSA/DNA carries a tamper-evident PSA/DNA sticker, and the certification number is printed on that sticker. Read it exactly as printed: it is a mix of letters and digits.

How to check it. Open psacard.com/cert, type the number into the form and submit. If PSA holds a certificate under that number, its record opens with the details of the item the certificate was issued for. Compare those details with the shirt and the signer in front of you.

What a match shows, and what it does not. A match shows that PSA/DNA issued a certificate under that number and tells you what it was issued for. On its own it does not show that the sticker and letter in your hands belong to the item described. PSA itself warns that a lookup does not remove the risk of counterfeits and that forgers can reuse numbers from public sources, so the sticker, the letter and the PSA record all need to agree with the shirt. If a number returns no record, enter it again once, then contact PSA customer care with photos of the shirt, the signature, the sticker and the letter, as PSA's own page asks.

How Walkouts records it. When Walkouts lists a PSA/DNA shirt, its certificate number is shown in the authentication details on the shirt's page, labelled "COA Nr.", with a button beside it that opens that number's record at PSA, so the check above is one click.

Why this matters for collectors

For a collector weighing a high-value signed piece, a PSA/DNA opinion is a bureau-scale, forensically-backed judgment a buyer can verify independently, the DNA-marker and the online certificate lookup together meaning the assurance does not rest on trust. Walkouts uses PSA/DNA as a premium authentication route for signed items, the kind of independent, checkable opinion that carries weight at the top of the market. PSA operates from Southern California and serves collectors worldwide.