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This question has probably been already answered somewhere else but I didn't find anything on the internet so I'm asking here.
I wonder how clients such as Geth query the blockchain to get specific information like a transaction or some address' balance. If you search by transaction hash you can get anything you're looking for in a couple of seconds, but how does the client actually fetch data from the blockchain? I know Ethereum is backed by LevelDB, but I still don't get how it is possible to skim through the entire blockchain is such little time.
Maybe I'm getting something wrong, thanks in advace!

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