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A Block Header is used to identify a particular block on an entire Blockchain and is hashed repeatedly to create Proof of Work (PoW) for [dido:public:ra:xapend:xapend.a_glossary:m:mining]] rewards. A blockchain consists of a series of various blocks that are used to store information related to transactions that occur on a blockchain network. Each of the blocks contains a unique header, and each such block is identified by its block header hash individually.

Source: https://www.investopedia.com/terms/b/block-header-cryptocurrency.asp