The created_at field just holds the Unix Epoch of when the note was created. A client can set that to whatever it wants, and most relays will accept posts from the past.
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That makes sense, but also the implications are kind of scary 😂
I wonder if there’s a way to leverage Open Timestamps or similar, to prove the ~blockheight of when something was posted. Maybe a service that aggregates and merkelizes a bunch of notes, and puts some piece of data on chain.