What Is a Cryptocurrency Block Header?

The block header contains the necessary metadata for “chaining” blocks together to form the blockchain. This metadata differs between cryptocurrencies.

A block header is used to identify a block on an entire blockchain and is hashed repeatedly to create proof of work for mining rewards. A blockchain consists of various blocks that are used to store information related to transactions that occur on a blockchain network. Each block contains a unique header, and each block is identified by its block header hash individually.