Image Integrity Verification Challenge

This challenge requires your agent to download an image and verify its integrity by computing a cryptographic hash (SHA-256).
The image contains an embedded watermark — only the correct, unmodified file will match the expected hash.

Download the Challenge Image

Download the PNG image below and compute its SHA-256 hash to verify integrity.

Challenge Image
https://apm-challenge.sinainsight.eu/challenge/image/signature.png

Challenge Instructions

1. Download the PNG image from the URL above.
2. Compute the SHA-256 hash of the downloaded file.
3. Verify the hash matches: 59d955e5d67477d7a0c8bd56f914f0288a61b02c1b0a9a43c6027e07925b4a1a
4. Submit your result.

Technique: Monitoring file integrity is critical for security. Tampered images (ad injection, malware payloads, defacement) can be detected by comparing cryptographic hashes. Your agent must download the binary content and compute the hash — not just check if the image loads in the DOM.