# Detect tampered and deepfake Host Accommodation Form > A host accommodation form is not a letter, it is an official form. The host completes it at a town hall or police station, proves their own identity and income, and signs in front of an official who legalises the signature and applies the authority's stamp. Germany issues it as a Verpflichtungserklärung, Spain as a carta de invitación, the Netherlands as a garantstelling. Forging one means forging a government form and its legalisation block, and TamperCheck examines both halves. **Canonical URL:** https://tampercheck.ai/documents-support/host_accommodation_form **API document class:** `host_accommodation_form` --- ## What a genuine host accommodation form contains The form is pre-printed by the issuing authority and carries its own serial or reference number. The host enters full name, date of birth, nationality, address and identity document number; the visitor is entered with name, date of birth, passport number and nationality; and the relationship between them is declared. Separate sections cover lodging and financial liability, because a host may offer one without the other, and the liability declaration spells out the obligations accepted, including repatriation costs and any recourse to public funds. A spouse or co-tenant often has to sign as well. What separates this form from an invitation letter is that the signature is witnessed. The host signs at the counter, the official confirms their identity and their means, and the authority applies a stamp, a legalisation note and frequently an embossed or dry seal, with a date and a validity window of a few months. Each of those elements constrains the others: the legalisation date cannot precede the form's issue date, the validity window has to contain the travel dates, and the address declared has to be the address the visitor gives everywhere else. ## How host accommodation form forgeries are made ### Blank forms completed away from the counter A genuine blank form is obtained or scanned, filled in at home, and the legalisation block faked. The printed form is real, which carries it past a glance, but the entries are laser or inkjet text where a counter-completed form would carry handwriting, a wet stamp and a fee receipt. ### Embossed seal flattened into print A dry seal deforms the paper and shows as relief with no ink at all. Copied, it becomes a printed grey pattern of uniform depth with the paper underneath undisturbed. This is the single element a scanner cannot carry across, and it is checked directly on this document class. ### Validity window extended The legalisation date or the declaration's expiry is altered so a form issued for an earlier trip covers a later one. The authority's reference number still belongs to the original issue, and the new date usually contradicts the counter stamp or the fee receipt printed beside it. ### Visitor identity swapped The host and the legalisation are genuine and the visitor block is replaced, so a declaration made for one relative is sold to another. Passport number and name change while every other field, the signatures included, stays exactly as it was signed at the counter. ### Second signature added Where a spouse or co-tenant must countersign, the missing signature is drawn or copied from elsewhere in the file. Two signatures made at the same counter share ink behaviour and pen pressure, and a signature pasted in afterwards matches neither the other signature nor the paper. ### Forms rebuilt as PDFs The whole form is reconstructed from a scan of a real one, correct to the millimetre. Text then sits too squarely inside the field boxes, because a form completed on a counter typewriter or by hand never aligns that perfectly with its own printed rules. ## What TamperCheck checks on a host accommodation form 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. ### Signature forgery analysis Signature regions are assessed for ink consistency and for how the stroke sits on the page, which distinguishes a genuine pen stroke from a pasted image of one. ### 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. ### And many more checks The three above are the layers that carry the most weight on a host accommodation form. 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 a host accommodation form, and why Consulates verifying private lodging and sponsorship declarations. 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 a host accommodation form in 4 steps 1. **Check the fields against each other.** Read host details and address, stay dates, and legalised signature together rather than one at a time. Forgers typically change one value and leave the rest of the document describing the original. 2. **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. 3. **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. 4. **Run a forensic check.** Manual review catches obvious edits but not field-level pixel manipulation or synthetic generation. TamperCheck runs 200+ forensic checks on a host accommodation form and returns a risk score from 0 to 100 in about a minute, at $0.50 per document. ## Frequently asked questions ### How do consulates verify a host accommodation form? They check it with the authority that issued it. The form carries a serial or reference number from the municipality or police station that legalised the host's signature, and that office can confirm the entry, the date and the host's identity. The consulate also confirms the validity window still covers the travel dates and that the host's means were assessed at the counter. ### Can a sponsorship form be forged for a visa? Yes, and the usual method is not to draw a form from scratch but to complete a genuine blank one and fake the legalisation. The printed form is then authentic while the stamp, the official's signature and the embossed seal are copies. Those are exactly the elements that behave differently on the substrate, which is where a forensic examination concentrates. ### What is the difference between an invitation letter and a host accommodation form? An invitation letter is written by the host; a host accommodation form is issued by an authority and signed in front of an official who verifies the host's identity and income. Germany's Verpflichtungserklärung, Spain's carta de invitación and the Dutch garantstelling are forms of the second kind, and they carry legal liability that a private letter does not. ### Can an embossed seal be checked in a scan? Yes, up to a point. A genuine dry seal deforms the paper, so it appears as relief with directional shading and no ink, and that texture survives a reasonable scan. A copied seal arrives as flat tone sitting on the surface of the page. TamperCheck includes an embossed seal check for this document class and reports what it finds against the region it examined. ## Related document types - Invitation Letter: https://tampercheck.ai/documents-support/invitation_letter - Sponsor Letter: https://tampercheck.ai/documents-support/sponsor_letter - Travel Itinerary: https://tampercheck.ai/documents-support/travel_itinerary - Travel Agency Booking: https://tampercheck.ai/documents-support/travel_agency_booking - Accommodation Booking: https://tampercheck.ai/documents-support/accommodation_booking - Boarding Pass: https://tampercheck.ai/documents-support/boarding_pass --- Try TamperCheck now: https://tampercheck.ai/dashboard · Docs: https://tampercheck.ai/docs · Pricing: https://tampercheck.ai/pricing