![Crypto Terms Glossary: What is Block Header? Crypto Terms Glossary: What is Block Header?](/img/178/160/what-is-block-header-sm.webp)
A block header is a mechanism that is used to identify individual blocks that have been created within a blockchain network, with each block having its own individualized header to help keep track of changes in the protocol. Blocks are layered in sequential order beginning with the genesis block and each block header contains three sets of block metadata and other individualized components.