Seals, Stamps and What They Certify

Seals are the oldest surviving authentication technology still in daily use, and they work the same way now as they always did. The impression asserts that a document issued from a particular office. Everything that follows from that assertion depends on whether the assertion can be checked, and on nothing else.

What a seal asserts

Official origin. This document came from this office, acting in its official capacity, rather than from a person who happens to work there and has access to the letterhead. That distinction is the whole content of the assertion.

Authority to issue. The office had the power to make a document of this kind at all, which is very often the fact that actually matters in a dispute about a permit, a license or a certificate somebody has produced.

Completeness, sometimes. A seal placed across a join or over a fold asserts that the pages traveled together, which is why removing a fastening damages the assertion.

Nothing about accuracy. The register behind the seal may contain an error made decades ago by somebody transcribing a name they had only ever heard spoken, and the sealed certificate reproduces that error perfectly faithfully.

Nothing about currency. A sealed certificate speaks as of the moment it was issued. Whether the underlying entry has since been amended, annotated or superseded is a separate question, and one the certificate cannot answer.

The three kinds of mark, and what each is for

Embossed impressions. A physical deformation of the paper. Difficult to reproduce photographically, which is why a photocopy of an embossed certificate loses the feature entirely.

Ink stamps. Easy to apply and easy to copy, so whatever value they carry lies in the wording, the register number and the accompanying signature rather than in the mark itself. Alone, an ink stamp establishes very little.

Printed security features. Watermarks, intaglio printing, microtext, fluorescent fibres and void pantographs, which move the assertion from the mark into the substrate.

Digital seals. A cryptographic signature over the document, verifiable against a published certificate. It is the only variety that can be checked without holding a known specimen for comparison, and the only one that survives being emailed.

Combinations are common. Most official documents now carry several of these features at once, and the strongest of them is usually the one hardest to see: a watermark, a fibre, or a line of microtext that only reveals itself under magnification.

Why sealed documents are self-authenticating

The rules name them. Domestic public documents under seal, and certified copies of public records, are admissible without a witness to establish what they are.

It is a rule of convenience. Requiring a custodian to travel and testify for every register entry offered in evidence would stop proceedings altogether, so the seal stands in for the witness who would otherwise have to be called.

It is rebuttable. Self-authentication removes the need for proof of authenticity; it does not prevent anybody proving that the document is a forgery.

It does not make contents admissible. The hearsay question is entirely separate, although public records happen to have their own exception as well, which is why the two rules are confused with each other so persistently.

Unsealed official documents need more. A signature plus a certification that the signer holds the office, which is the longer route.

Checking a seal that arrives from elsewhere

Compare against a known specimen. Many agencies publish images of their current seals, and several maintain lists of the specimens they have retired. A side-by-side comparison takes minutes and settles most questions on the spot.

Read the wording. Forged seals frequently carry an office name that does not exist, a misspelling nobody proofread, or a formula the real office abandoned years earlier. Reading the ring of text is quicker than any other check.

Check the register number. Where a certificate carries a serial or an entry number, the issuing office can usually confirm that the number matches the entry and that the particulars on the certificate match what the register holds.

Feel the paper. Embossing, intaglio printing and security substrate are all tactile, and the absence of any texture at all on a document that ought to have some is more informative than any amount of looking.

Ask the issuing office. The slowest and most reliable method, and the one that resolves questions about a document suspected of being forged.

Foreign seals, and why they need a chain

Recognition does not travel. No official here can reasonably be expected to know what a provincial registrar's seal in another country looks like, or to notice that the wording on it changed after an administrative reorganization.

So a chain is used instead. Each authority in turn certifies the signature and seal of the one below it, ending at an office the receiving country does recognize. Recognition is manufactured by the sequence rather than assumed.

The apostille shortens the chain. Set out in the apostille and the countries it covers, which replaces the whole sequence with one certificate.

Legalization is the longer route. Where no apostille is available, described in legalization where no apostille applies.

The chain proves origin only. Exactly as a domestic seal does, and for exactly the same reasons. A fully legalized certificate recording something untrue is a fully legalized certificate recording something untrue.

The reason seals persist in an age of databases is that they are a physical claim attached to a physical object, and physical claims are still the cheapest to make and the easiest to inspect. A digital signature is stronger and requires equipment; a raised impression requires a thumb.

That also explains why photocopies of sealed documents are so often refused. The copy discards the part of the document that was doing the authentication work, leaving a picture of a seal, which is exactly what a forger would produce.

For any document arriving from an unfamiliar office, the useful reflex is to treat the seal as an invitation. It names the office that claims to have issued the document, and that office can be asked whether it did.

None of the marks reach the contents. A sealed certificate recording a name spelled three different ways in three different registers is a sealed certificate recording an error, and the argument about which spelling is right happens entirely outside the ink.