Each sample below is a stripped, re-encoded, cropped, or trimmed copy of the corpus photo trusted-photo.jpg, audio recording trusted-audio.m4a, or video clip trusted-video.mov, signed by Robert Angelo and listed in the Reconize registry. None of them carries Content Credentials. The first photo had its public hidden mark removed too; some of the others still carry it, because the public mark survives re-saving and resizing, so the extension may also report a hidden mark for them. The registry lookup does not use the mark. They are here so anyone can check that a stripped photo, audio clip, or video still leads back to who signed it.
How to test
With the browser extension (1.0.4 or later): hover a picture, click the Reconize chip, then Look it up. Without it: click Check → on any card below, or download a file and drop it on reconize.me/verify; the lookup runs on its own when there are no credentials. Either way only a fingerprint of the picture, sound, or video frames is sent, never the file.
Photos (rcz-fp-1 & rcz-kp-1)
Stripped with public tools
An outside researcher removed the Content Credentials and the public hidden mark from the signed photo, then shared a screenshot of it.
Expected: Names Robert Angelo (matched by the picture).
Download ·
Check →
Re-saved for social media
Shrunk to 1080 pixels and saved as a new JPEG, as most sites do. No credentials, no metadata.
Expected: Names Robert Angelo.
Download ·
Check →
Cropped off centre
About half of the picture kept, off centre.
Expected: Names Robert Angelo (keypoints).
Download ·
Check →
Squeezed and cropped
Squeezed to 75 percent of its width, then cropped.
Expected: Names Robert Angelo (keypoints, stretched fit).
Download ·
Check →
Screenshot in a window
The photo shown smaller inside a grey window, as a screenshot would capture it.
Expected: Names Robert Angelo.
Download ·
Check →
Mirrored
Flipped left to right.
Expected: Names Robert Angelo (mirrored keypoints).
Download ·
Check →
Rotated
Turned 90 degrees.
Expected: Names Robert Angelo (keypoints).
Download ·
Check →
Control: never signed
A generated picture nobody signed or listed.
Expected: No match.
Download ·
Check →
Audio & Video (rcz-afp-1 & rcz-vfp-1)
Re-encoded to 96 kbps MP3
The signed AAC file converted to a 96 kbps MP3 with all metadata and container atoms stripped.
Expected: Names Robert Angelo (matched by how it sounds, BER 0.061).
Download ·
Check →Trimmed & gain-shifted clip
First 1.5 seconds cut off, level lowered by 3 dB, and re-saved as a clean M4A with no credentials.
Expected: Names Robert Angelo (matched by how it sounds, BER 0.057).
Download ·
Check →360p social video re-encode
Shrunk from 1080x1920 MOV to 360x640 MP4 (CRF 30) with all QuickTime C2PA atoms stripped.
Expected: Names Robert Angelo (matched by sound & picture, BER 0.013).
Download ·
Check →Muted & trimmed video clip
Soundtrack removed completely, first 1.5 seconds trimmed, scaled to 540x960 MP4 with no metadata.
Expected: Names Robert Angelo (matched by video picture alone, BER 0.008).
Download ·
Check →
What this does not show
A match here comes from a Reconize record of what the signed picture looks like, not from anything left inside the copy. It says who listed a picture that looks the same, which is not proof of who made it. Heavy edits can still escape: shrinking the picture to a sixth of a larger frame or less, keeping only a small corner of the picture, or repainting it. The full list is under Known limits on the corpus page.
