AngelFingerprint: a traceable, interpretable, and white-box covert watermark for text-guided image editing

AngelFingerprint is a traceable, interpretable, and white-box covert watermark for text-guided image editing; it writes the CLIP text embedding of the editing prompt into the diffusion model weights via LoRA and recovers it from image pixels alone. It achieves 86% top-1 accuracy in 200-way prompt retrieval on the MagicBrush dataset, with prompt inversion at 20%.