Deep dive into AI text-watermarking and what EU's AI Act actually mandates about AI detectability. How it works: The SynthID paper from Demis and team in Nature is probably the best primer in the technology. Generally, most approaches involve sampling next tokens statistically differently with some random key while not distorting the semantics of the output. Detecting text watermarks can never be perfect. Longer passages are always easier to detect, only at ~400 tokens do you get a true…