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This totally works as an approach! Brave does it for canvas data and a bunch of other web APIs as well. The "farbling" noise is deterministic per profile/origin combo to prevent being able to average it out across multiple page loads, but otherwise random.

https://brave.com/privacy-updates/4-fingerprinting-defenses-...

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This allows to run fingerprinting script on hundred of domains and filter out the noise though.

If you own hundreds of domains, you're welcome to try, but there's no good reason to. Fingerprinting scripts rely on a canvas being identical between sessions to identify that the same user is even there in the first place. If you can already single out one user's activity across a hundred domains, you don't need to fingerprint them any further.

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