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My understanding is that earlier votes are weighted more than later votes so as to incentivize people to scour news posts for good content. No?

I don’t remember reading that in the white paper.

Edit: I just re-read the applicable sections of the white paper and I do not see any mention of your expectation. I note the curation reward algorithm was finalized after the release of the white paper.

The current curation reward system is not detailed in the whitepaper, and the section on the website where it explains the math is nothing like the current implementation in the code.