From the Whitepaper: Timestamps prove that the data must have existed at the time"

From the Whitepaper: Timestamps prove that the data must have existed at the time"

The whitepaper says exactly this: "The timestamp proves that the data must have existed at the time, obviously, in order to get into the hash. Each timestamp includes the previous timestamp in its hash, forming a chain, with each additional timestamp reinforcing the ones before it."

It seems to me that you could put any time you want in the timestamp. Is it the next sentence about "reinforcing" that is key to his meaning?

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