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Unlike the block hash, the block height is not a unique identifier. While a single block will always have a specific and invariant block height, the reverse is not true - the block height does not always identify a single block. Two or more blocks may have the same block height, competing for the same position in the blockchain. This scenario is dis‐ cussed in detail in the section on “Blockchain Forks” on page 204. The block height is also not a part of the block’s data structure; it is not stored within the block. Each node dynamically identifies a block’s position (height) in the blockchain when it is received from the bitcoin network. The block height may also be stored as metadata in an indexed database table for faster retrieval. A block’s block hash always identifies a single block uniquely. A block also always has a specific block height. However, it is not always the case that a specific block height can identify a single block. Rather, two or more blocks may compete for a single position in the block‐ chain. The Genesis Block The first block in the blockchain is called the genesis block and was created in 2009. It is the “common ancestor” of all the blocks in the blockchain, meaning that if you start at any block and follow the chain backwards in time, you will eventually arrive at the genesis block. Every node always starts with a blockchain of at least one block because the genesis block is statically encoded within the bitcoin client software, such that it cannot be altered. Every node always “knows” the genesis block’s hash and structure, the fixed time it was created and even the single transaction within. Thus, every node has the starting point for the blockchain, a secure “root” from which to build a trusted blockchain. See the statically encoded genesis block inside the Bitcoin Core client, in chainpar‐ ams.cpp: https://github.com/bitcoin/bitcoin/blob/ 3955c3940eff83518c186facfec6f50545b5aab5/src/chainparams.cpp#L123 The genesis block has the identifier hash 000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f. You can search for that block hash in any block explorer website, such as blockchain.info, and you will find a page describing the contents of this block, with a URL containing that hash: https://blockchain.info/block/ 000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f 166 | Chapter 7: The BlockchainPDF Image | Mastering Bitcoin
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