Did a Robot Write This? We Need Watermarks to Spot AI - The Washington Post

Aaronson, who was hired by OpenAI this year to tackle the provenance challenge, explained that words could be converted into a string of tokens, representing punctuation marks, letters or parts of words, making up about 100,000 tokens in total. The GPT system would then decide the arrangement of those tokens (reflecting the text itself) in such a way that they could be detected using a cryptographic key known only to OpenAI. "This won't make any detectable difference to the end user," Aaronson said.