It only pushes the top of the chain every X hours, just creating "safe points". Not all data is pushed to the blockchain of course, it will be too expensive to begin with
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I guess I don't understand. I thought the idea of a distributed ledger was everyone could confirm everything. Maybe my mistake is thinking distributed ledger and blockchain are the same thing?
It is practically the same thing, yes. But the use-case here is different - you don't need everyone to be able to confirm everything. You need to be sure that your data was not tampered with.