Requires covered providers — entities that create generative AI systems with over 1,000,000 monthly users accessible in Washington for personal consumer use — to embed provenance data in AI-generated or materially altered video, image, or audio content, to the extent commercially and technically reasonable. Provenance data must be difficult to remove or tamper with; use of a commonly supported standard such as C2PA is deemed compliant. Separately, requires all Washington government agencies that deploy AI systems intended to interact with consumers to unconditionally disclose AI involvement before or at the time of interaction. Enforcement of the provenance chapter is exclusively through the attorney general under the Consumer Protection Act. The bill excludes video games, interactive commerce experiences, systems used solely for upscaling/noise reduction/compression, and business-to-business uses. Takes effect February 1, 2027.