What it is
Block height is a simple numerical identifier for each block in a blockchain, starting with 0 for the genesis block. Every subsequent block has a block height one greater than the block that precedes it. This number represents the total number of blocks that have been added to the chain since its inception, effectively measuring the length and progress of the blockchain.
Block height is a fundamental metric for tracking the state and progression of the Bitcoin network. Major network events, such as the bitcoin halving, are often specified by a particular block height rather than a date, as block production times can vary. For a reader, knowing the current block height helps understand the network's age and proximity to scheduled protocol changes or historical events.
Why it matters
Block height provides a precise, immutable timestamp for events on the blockchain. It is crucial for understanding the timing of protocol upgrades and halvings.
Reviewed under editorial standardsUpdated September 26, 2026Not investment advice