Supported document type
Detect tampered and deepfake Affidavit
An affidavit carries weight only because of the oath attached to it, so a forged one attacks the oath or the statement it covers. Either a jurat and notary block are fabricated so a statement nobody swore reads as sworn testimony, or a genuinely sworn affidavit has its numbered paragraphs edited after the deponent signed and the officer sealed it. Courts and administrative offices accept these at face value. TamperCheck examines the seal, the jurat, and every paragraph above them.
API slug: affidavit
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What a genuine affidavit contains
An affidavit opens with the deponent's full name, address, and the capacity in which they speak, then states facts in the first person across numbered paragraphs, closing with a statement of truth. Below that sits the jurat: sworn at a named place on a named date, before an officer whose signature, printed name, commission number, and commission expiry appear underneath. A seal or stamp overlaps that block. Each page carries the deponent's initials, and exhibits are referenced by letter and certified with their own endorsement.
The jurat is the hinge the rest hangs from. It records that a named officer watched a named person swear to the paragraphs above, at one place, on one date, which means the sworn date cannot precede an event described in the body and the commission number must belong to an officer whose commission had not expired that day. Initials on every page tie the sworn text to a page count, and every exhibit letter quoted in the paragraphs has to match an exhibit actually attached. A paragraph added later breaks at least one of those ties.
How affidavit forgeries are made
Paragraphs edited after swearing
The jurat, seal, and signature are all genuine, and a numbered paragraph above them has been rewritten or added. This is the version that appears in perjury applications, because the officer's block gives the altered text the standing of evidence. The edited paragraph usually breaks the spacing rhythm of the ones around it.
Fabricated jurat blocks
An unsworn statement is given a jurat copied from a real affidavit, complete with place, date, and officer details. Nobody was ever put on oath. The copied block tends to carry the resolution and background tone of the document it came from rather than the page it now closes.
Seal impressions taken from another affidavit
A notary or commissioner's stamp is lifted from a genuinely sworn document and placed over the new jurat. A real impression is laid down with the text already on the page and interacts with it. A pasted one sits on top as a clean layer with no ink interaction underneath.
Sworn date changes
The date of swearing is moved to bring an affidavit inside a filing window or limitation period, or to put the deponent in a place on a day that suits the case. One field changes, and it then contradicts the commission expiry, the exhibit endorsements, and any court filing stamp on the same bundle.
Invented commission and witness details
A commission number is made up, or borrowed from an officer who never saw the deponent. Numbers that do not follow the commissioning authority's format, or that sit alongside an expiry date inconsistent with the sworn date, are the usual tell on a document that otherwise reads correctly.
What TamperCheck checks on an affidavit
TamperCheck runs 200+ forensic checks across three layers and returns a risk score from 0 to 100 with plain-English findings tied to specific regions of the document. These three carry the most weight on this document class.
Embossed seal analysis
A physically embossed seal deforms the paper it sits on. A seal that was scanned and reprinted is flat, and the two separate cleanly under analysis even when they are hard to tell apart by eye.
Date and validity consistency
Issue, expiry, and period dates are checked against one another and against the file's own creation metadata, which catches backdating and validity extension.
Field-level forensics
Every text region is analysed in its own right rather than as part of one whole-page image. This catches the smoothed and feathered edits that whole-image Error Level Analysis misses entirely.
And many more checks
The three above are the layers that carry the most weight on an affidavit. Every upload runs the full suite of 200+ checks regardless of document class, spanning file structure and metadata, pixel-level forensics, font and text rendering, optical and print characteristics, provenance signals, AI-generation signatures, and many more checks.
Who verifies an affidavit, and why
Courts, law firms, and administrative offices accepting sworn evidence. In each case the document is being used to unlock money, access, or a legal status, which is exactly what makes it worth forging.
How to verify an affidavit in 4 steps
Check the fields against each other
Read deponent statement, notary stamp, and sworn date together rather than one at a time. Forgers typically change one value and leave the rest of the document describing the original.
Inspect the file metadata
Open the document properties and look at the producer, creation date, and modification date. A document produced by a consumer PDF editor, or created long after the date printed on its face, is worth a closer look.
Ask for a second document
Request a corroborating document from the same issuer or an adjacent period. Forgery effort concentrates on one file, so inconsistencies surface as soon as there are two to compare.
Run a forensic check
Manual review catches obvious edits but not field-level pixel manipulation or synthetic generation. TamperCheck runs 200+ forensic checks on an affidavit and returns a risk score from 0 to 100 within seconds, at $0.50 per document.
Frequently asked questions
How can you tell if an affidavit has been altered?
Compare the sworn paragraphs against the jurat that is supposed to cover them. An affidavit altered after swearing shows a paragraph whose line spacing, font rendering, or compression differs from the rest of the body, while the seal and signatures below remain untouched and genuine. Check too that the sworn date precedes nothing described in the text and falls inside the officer's commission period.
What makes an affidavit fraudulent?
An affidavit is fraudulent when the oath it claims did not happen or no longer covers what the document says. That is a fabricated jurat, a borrowed commission number, a stamp copied from another file, or body text changed after the deponent swore to it. False content sworn honestly is perjury rather than forgery, and needs evidence outside the document to establish.
How do I verify a notary or commissioner's stamp on a sworn statement?
Read the commission number and expiry date off the stamp and check them against the register kept by the commissioning authority, then confirm the officer was entitled to administer oaths in the place named in the jurat. Forensically, the test is whether the impression interacts with the text beneath it or sits over it as a separate layer.
Can a scanned affidavit be checked for tampering?
Yes. A scan is what most affidavits are submitted as, and it preserves the evidence that matters: per-region compression history, ink and noise characteristics, and whether the seal was impressed into the page or added to the image. Upload the scan and a verdict comes back with a risk score from 0 to 100 within seconds.
TamperCheck analyses affidavit uploads with a hybrid forensic and AI pipeline tuned for this document class. Upload endpoints accept PDF and common image formats; class is inferred automatically. See the API & MCP documentation for authentication, async jobs, and webhooks.