Yeah, it's a pointless exercise. I hope the author is just trolling given that he is knowledgeable in the field.
reply> Here are three 64-character hex strings. Two are random. One is HMAC-SHA256(secret_key, "anthropic"). You don't have the key. Which one is the HMAC?
I think the point is probably to help convince people that the watermarking doesn’t perceptibly impact quality, which is a concern some people have (whether well founded or not).
reply"doesn’t perceptibly impact quality" no not perceptibly but it does.
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