fraud-fake-chop

Detect forged corporate seals via image comparison and document integrity analysis.

2|Updated Jun 26, 2026
One-click install
npx skills add https://github.com/sxd007/investigation-ontology --skill fraud-fake-chop
Or copy as Structured Prompt for Agent
Please help me install this Agent Skill.
Skill: fraud-fake-chop
Source: https://github.com/sxd007/investigation-ontology/tree/main/skills/fraud-fake-chop
Command: npx skills add https://github.com/sxd007/investigation-ontology --skill fraud-fake-chop

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill requires opencv-python, PyMuPDF, scikit-image, Pillow, anthropic, numpy, and includes scripts (resource) and references (resource) components.

What problem does it solve?

This skill addresses the critical risk of document fraud by identifying whether a corporate seal is forged, stolen, or used without proper authorization, preventing financial and legal exposure.

Core Features & Use Cases

  • Seal Authenticity Analysis: Uses image processing to compare suspect seals against known authentic samples using SSIM, IoU, and pixel-level difference heatmaps.
  • Document Integrity Detection: Performs Error Level Analysis (ELA), PDF layer analysis, and noise consistency checks to detect Photoshop tampering or digital synthesis.
  • Use Case: When a suspicious contract is received, use this skill to verify if the seal matches the company's official record and to check for signs of digital manipulation, such as inconsistent noise patterns or suspicious PDF layer structures.

Quick Start

Use the fraud-fake-chop skill to analyze the suspect document 'contract_v2.pdf' against the official seal sample 'official_seal.png'.

Frequently Asked Questions about fraud-fake-chop

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I detect a forged corporate seal on a suspicious contract?

To detect a forged corporate seal, you can compare the suspect seal against an authentic sample using structural similarity, intersection-over-union, and pixel-level difference heatmaps to identify discrepancies. This skill automates that image comparison process to provide forensic evidence of seal tampering.

What is error level analysis for document integrity detection?

Error level analysis is a technique used for document integrity detection to identify digital tampering by analyzing inconsistent noise patterns or suspicious PDF layer structures. It helps detect Photoshop manipulation or digital synthesis within a received contract.

Can I use computer vision to verify document tampering in a PDF?

You can use computer vision to verify document tampering in a PDF by performing layer analysis and noise consistency checks. This approach detects digital synthesis and manipulation by examining the structural integrity of the document format.

What is the best way to compare a suspect seal against an official seal sample?

The best way to compare a suspect seal against an official seal sample is using automated image processing techniques like structural similarity index measurement and pixel-level difference heatmaps. This provides forensic-grade evidence support for unauthorized document signing investigations.

Does this seal verification skill support contract fraud investigations?

This skill supports contract fraud investigations by identifying stolen or misused corporate seals through automated image comparison. It provides forensic-grade evidence support by detecting unauthorized document signing and digital tampering.

What are the limitations of using image comparison for seal authenticity analysis?

Image comparison for seal authenticity analysis is limited by the quality of the provided seal samples and document images. Accurate verification requires clear authentic samples to effectively detect structural similarity discrepancies and noise inconsistencies.