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General TradingB
Block Header
A block header is the metadata portion of a block on a blockchain, containing critical information needed to identify and validate the block. Key fields include the hash of the previous block, a timestamp, the Merkle root of all transactions in the block, the nonce used in mining, and the difficulty target. The block header is what miners hash repeatedly when attempting to find a valid proof of work, and it serves as the unique fingerprint of each block.
Example
“Miners repeatedly hash the block header with different nonce values until they find one that produces a hash below the network's difficulty target.”