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 }

What the provenance inspector simulates

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Read the explanation

This inspector uses procedural images and preset metadata to demonstrate watermark and provenance concepts. The spectral heatmap is simulated. Its confidence score is calculated from authored formulas, and its signature labels come from preset flags. It does not verify a real uploaded image or cryptographic signature. For a synthetic injected preset, set blur, crop, and noise to zero. Reducing JPEG quality from one hundred to fifty gives degradation equal to fifty times zero point four five, or twenty two point five. The confidence formula subtracts zero point seven two times degradation, moving from ninety four point two to seventy eight percent. The page calls a signal detected at fifty percent confidence or above. Its provenance panel separately reads validity and tamper flags from the selected preset. Compare the channels and export the report, but do not treat these simulated labels as proof of real authorship or authenticity.