Block Height Definition
What is block height in a blockchain?
The height of a block in a blockchain is the number of blocks that comes before that the last block that has been confirmed. The blockchain starts with the genesis block, which has a height of zero. After that each block is counted sequentially and difference between the last and the genesis is considered the block height.
The height of the block is not recorded in the block itself and must be computed by looking at the entire blockchain. This might be a good representation for time for Bitcoin since a new block every 10 minutes, which are confirmed by miners. It might not be an accurate representation of time for other cryptocurrencies since, depending on the altcoin, blocks are created at different speeds and different sizes. It is used to measure the distance or maturity of the network since genesis block. Some uses for this are when a coin’s developers will announce an implementation of an update, like the segwit update, at a specific block height.