Blocks hold batches of valid transactions that are hashed an... More height represents the number of blocks that were confirmed in the entire history of a particular A blockchain—the technology underlying bitcoin and other c... More network – from the genesis block (or block zero) until the most recent one. Unlike the genesis block, all other blocks contain a reference (hash) to the block that came immediately before it, and the block height is the number of each block in that sequence. So the block height of the genesis block is #0, and the block height of the first block mined is #1. The block height consists of the number of blocks mined (or validated) since the creation of a particular blockchain network.
Block height should not be compared directly between different blockchains, as their average block period and hash rates are different. However, a copy of a blockchain may be considered “out of sync” if the block height of the local copy differs from what the globally accepted block height is. Thus, block height is a useful stat to look at whether the copy of the given blockchain is up to date or not.