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In the go-ethereum code, I see functions use both the number and block hash to locate a block.

Why is that? Isn't block hash enough?

An example function: https://github.com/ethereum/go-ethereum/blob/eea3ae42a3d9bcbd33474c0e482754c5196a469f/core/block_validator.go#L53

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    I'm not a geth dev, hope a real one provides the solution, but I'm guessing they do it so lookup is more efficient, if I know it's bock 5 with hash 0x321a I don't need to look for that hash in every block, I just go to the 5th one and check hashes – Enrique Alcazar Nov 20 '18 at 13:31

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