Overview
A block header is the metadata of a block containing hashes, timestamps, and state roots that link blocks together. It is the compact summary of a block used for verification. Light nodes download headers without full transaction data.
How It Works
The header includes the previous block hash, the Merkle root of transactions, a timestamp, and other consensus fields. Nodes verify headers quickly and use them to confirm chain structure. This enables efficient light-client operation.
Why It Matters
Block headers enable lightweight verification and efficient chain synchronization. They are the backbone of blockchains and proof-of-inclusion. Understanding them helps explain how light nodes and explorers work.
Related Concepts
Block Headers relate to Blocks, Merkle Trees, and Light Nodes. They underpin transaction verification.