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Forgery Verification Methods for National Tax Certificates (국세증명)

English conversion and structuring of the provided corpus. All proper nouns include original script in parentheses.

1) Scope and Purpose

• Document focus: How to verify forgery/tampering of National Tax Certificates (국세증명) issued by the National Tax Service (국세청).
• Primary use cases:
  • Vendor or contractor onboarding
  • Grant/loan applications
  • Compliance and audit checks

2) Core Verification Steps (Recommended Order)

1. Confirm the issuance number on the certificate.
2. Validate the certificate through official systems:
   • Hometax (홈택스)
   • Mobile Hometax (모바일홈택스)
   • Government24 (정부24) for documents issued via Government24
3. Perform barcode-based cross-check:
   • 3-part segmented barcode (bottom area)
   • Audio-conversion QR barcode (top-right area)
4. Conduct visual anti-forgery checks:
   • Watermark (central round emblem and wave pattern)
   • Copy-protection microtext/pattern (left-bottom “National Tax Service” style text)
5. Archive evidence (screenshots of system results, barcode scans).

3) Security Features and How to Check

Feature (Original Script)	Location on Document	How to Check	What a Valid Result Looks Like	Notes
Issuance number (발급번호)	Top-left area	Enter on official verification page of Hometax (홈택스) / Mobile Hometax (모바일홈택스)	System returns certificate metadata (type, name, date)	Typically verifiable within a limited window (e.g., 90 days from issuance).
3-part segmented barcode (3단 분할 바코드)	Bottom horizontal band (three segments)	Scan with supported verification app	Decodes to integrity data linked to issuance	Low-quality copies may fail to scan. Prefer original or high-resolution print.
Audio-conversion QR barcode (음성변환 바코드)	Top-right area	Scan with MarkAny (마크애니) app or equivalent	App confirms original/authentic status	Some scanners require stable lighting; avoid screen glare.
Watermark (워터마크)	Center area (round NTS emblem with wave pattern)	Tilt under light; compare density and crisp edges	Clear emblem and consistent wave texture	Photocopies often blur/flatten watermark effects.
Copy-protection microtext/pattern (복사방지코드)	Left-bottom patterned area	Visual inspection or magnifier	Repeating “National Tax Service (국세청)” microtext/pattern	Copying/scanning degrades contrast and legibility.

4) Official Verification Channels

Channel (Original Script)	Access Path	Supported Document Types	Validation Window	Steps
Hometax (홈택스)	Web portal	National Tax Certificates (국세증명) issued via Hometax	Typically limited-time window (e.g., 90 days)	Go to Civil Certificates (민원증명) → Original Verification (원본 확인) → Enter issuance number and required fields.
Mobile Hometax (모바일홈택스)	Mobile app	Same as Hometax	Same as Hometax	Open app → Civil Certificates (민원증명) → Original Verification (원본 확인) → Input issuance number.
Government24 (정부24)	Web/mobile	Certificates issued through Government24	As guided by Government24	Open issued certificate details → Use built-in verification function.

5) Barcode and App Guidance

• Recommended app: MarkAny (마크애니).
• Usage notes:
  • Use the audio-conversion QR barcode (top-right) and/or the 3-part segmented barcode (bottom) for cross-verification.
  • Ensure good lighting; avoid reflective screens or low-DPI prints.
  • If a scan fails, retry with the original PDF print or request a reprint in higher quality.

6) On-Site Verification Checklist

• Check the issuance number format and position (top-left).
• Verify the issuance number on Hometax (홈택스) / Mobile Hometax (모바일홈택스).
• If issued via Government24 (정부24), verify using Government24’s function.
• Scan the 3-part segmented barcode (bottom band).
• Scan the audio-conversion QR barcode (top-right) using MarkAny (마크애니).
• Inspect the watermark (central emblem and wave pattern).
• Inspect the copy-protection microtext/pattern (left-bottom).
• Capture and store screenshots of verification outcomes.

7) Common Failure Modes and How to Respond

Symptom	Likely Cause	Response
Barcode scan fails repeatedly	Low-resolution copy, screen glare, or compression artifacts	Request the original PDF or a high-resolution print; scan again under proper lighting.
Issuance number not found	Expired validation window or altered number	Ask for a freshly reissued certificate; re-verify immediately.
Watermark looks flat	Photocopy/scan artifact	Treat as insufficient evidence; rely on issuance number and barcode verification.
Mismatch between system data and document	Possible tampering	Reject the document and request a new, directly issued certificate.

8) Evidence and Record-Keeping

• Save verification screenshots (portal confirmation pages, app results).
• Note the verification timestamp, verifier’s name, and method used (issuance number, barcode types).
• Retain a copy of the submitted certificate (prefer original PDF print) with a reference ID for audit trails.

9) Quick Decision Flow

1. Issuance number verification succeeds → proceed.
2. Barcode cross-check (3-part and/or audio QR) succeeds → accept.
3. Visual checks confirm watermark/microtext → finalize.
4. Any failure or mismatch → request reissuance and re-verify.

10) References to Systems and Apps

• National Tax Service (국세청)
• Hometax (홈택스)
• Mobile Hometax (모바일홈택스)
• Government24 (정부24)
• MarkAny (마크애니)

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