Block height refers to the number of blocks that have been confirmed on a blockchain since the genesis block (block 0). It serves as a sequential identifier โ a block height of 800,000 means 800,000 blocks have been added to the chain.
Why Block Height Matters
Network Progress: Block height indicates how much history the blockchain has recorded.
Scheduled Events: Important protocol changes like Bitcoin halvings are triggered at specific block heights (e.g., the 2024 halving occurred at block 840,000).
Transaction Confirmation: When someone says a transaction has "6 confirmations," it means 6 new blocks have been added after the block containing that transaction.
Block Height vs Block Hash
While block height is a simple sequential number, the block hash is a unique cryptographic fingerprint. In rare cases of chain reorganization, two different blocks could temporarily exist at the same height, but they will always have different hashes.