You cannot create an event today, and put it's hash into a block from yesterday.

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In your note you said the inverse, adding the block hash as a tag. And I can actually create an event today, with yesterday's date, adding a yesterday's block hash.

That's why the note is also open time stamped, proving the note must have been created BEFORE the block that includes the OTS.

Ok, now I understand the "time window" logic. I was thinking about the usefulness of the block hash alone.