The “block height” is the number of blocks between the genesis block and the current block.

Blocks are where all Bitcoin transactions are stored and every 10 minutes a new block is created with new transactions added to previous ones.

For example, 10 minutes after the genesis block was created, a new block was added, which would result in a block height of 1.

If you were looking for a specific transaction in the Bitcoin blockchain, you would find it at a specific block height. As more blocks are added with more transactions, the blockchain grows longer and the block height increases over time.

The block height always reverts to the genesis block.