arxivcs.CRcs.AI2026-07-20
ChainMark: Model-Free LLM Watermarking with Closed-Form Calibration
Regulatory regimes such as the EU AI Act mandate machine-readable marking of synthetic text, but existing watermark detectors rely on the generating LM and on heuristic thresholds with no closed-form calibration. We introduce ChainMark, an active watermark that partitions the voc…