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Why is *double* SHA-256 hashing used in the block header?

Started by Bitcoin, Mar 13, 2022, 12:37 pm

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Bitcoin

Mar 13, 2022, 12:37 pm
Why is *double* SHA-256 hashing used in the block header?

Both the previous block's header hash and Merkle root hash use double SHA-256 hashing.


Why are two rounds used?


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