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> Can a watermark be traced back to me or my organization?

> No. The watermarking applies to Claude and its outputs. It doesn’t identify anything to do with individual users

But there's nothing stopping them from doing this in the future. In fact, couldn't they append the user's ID to the key in some manner?

1) That's a lot more entropy to gather, means sample size needs to be huge.

2) this also means check must be run against every user's ID in their database, 10^9 more expensive

That makes sense, though it sounds like it would still be feasibly cheap to only track a handful of users or organizations