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I indeed did not know about this. There seem to be some caveats:

https://anubis.techaro.lol/docs/admin/configuration/challeng...

I guess for the meta refresh challenge it's less "proof of work" and more "proof of patience".

The meta refresh challenge actually uses time as the proof! It makes sure you wait for at least 75% of the time the administrator configured and adds client side smear to ensure that browser temporal randomization doesn't trigger a false failure.

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