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Grainmark — VRC-48M

Seal it when you shoot. Check any copy later.

Anchor known-source media, then check whether a later file still matches that seal after re-encode, crop, or transcode. New seals stay private until you publish them.

Studio · Privacy · llms.txt

🎥

Drop media here or click to upload

Video (MP4, AVI, MOV) or Image (JPG, PNG, WebP) — up to 200 MB

Extracting perceptual features...
⛓
Media Anchored
Your topological proof is ready.

View raw anchor data

1. Select or upload anchor

or upload anchor JSON

Drop anchor JSON file

2. Upload media to verify

🔍

Drop suspect media here

The copy you want to check against the anchor

Visual-only check. Audio and playback timing are not compared. A sidecar is an unsigned comparison template.

Re-extracting topological features...

Original

📄

Drop original media

The known-good source file

Suspect

🔍

Drop suspect media

The file you want to check

Analyzing both files...