AI Watermark & C2PA Provenance Inspector

Evidence & Stress Lab

Sample Preset Target

Gemini Imagen 3 sample embedding imperceptible multi-band spectral SynthID watermarks with signed ES256 C2PA cryptographic assertions.

Perturbation Stress Testing

Simulate real-world social media compression, filtering, and re-encoding attacks to measure SynthID retention.

JPEG Quality Loss 100%

Gaussian Blur 0.0 px

Crop & Downsample 0%

Gaussian Noise Injection 0%

Spectral Filter Band

2D Spectral Watermark Analysis (SynthID) SynthID: DETECTED

Spatial Image Domain 256x256

2D FFT/DCT Spectral Energy Frequency Log-Mag

Spectral SNR 18.6 dB

SynthID Confidence 94.2%

Harmonic Correlation 0.884

Watermark Robustness High Resilience

SynthID Mechanism: Modulates pseudorandom harmonic carrier patterns directly into intermediate 2D discrete cosine/Fourier transform frequency bands during diffusion model generation, surviving standard lossy crops and compression.

C2PA Cryptographic Manifest DAG SIGNATURE VALID

Manifest Assertion Inspect Node: claim_generator

{ "claim_generator": "Google Gemini 2.5 Pro Vision", "instance_id": "urn:uuid:84e67a03-7bf1-4d39-9d52-6b940026e681", "signing_time": "2026-08-14T17:24:17Z", "signing_algo": "ES256", "signature_valid": true }