21MERIDIAN 2140
23 / 104HDR

Block header

An 80-byte structure miners hash to commit to a block, its predecessor and transaction set.

An 80-byte structure miners hash to commit to a block, its predecessor and transaction set.

An 80-byte structure miners hash to commit to a block, its predecessor and transaction set. This coordinate is placed in the wider system through its protocol, economic and historical relationships.

Understanding Block header helps distinguish a verifiable Bitcoin mechanism or historical record from slogans, products and market narratives.

01

Linked to related atlas coordinates

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Grounded in a source record

03

Explains function and trade-offs

04

Part of the open Bitcoin knowledge graph

DOC · 001Bitcoin Developer Reference — Block HeadersDocumentation
Reviewed 25 July 2026Source-first · No investment advice