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myarbrough@oreilly.com 2014-11-05 10:34:58 -08:00
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@ -51,7 +51,7 @@ The block header consists of three sets of block metadata. First, there is a ref
The nonce, difficulty target, and timestamp are used in the mining process and will be discussed in more detail in <<mining>>.
[[block_hash]]
=== Block Identifiers—Block Header Hash and Block Height
=== Block Identifiers: Block Header Hash and Block Height
The primary identifier of a block is its cryptographic hash, a digital fingerprint, made by hashing the block header twice through the SHA256 algorithm. The resulting 32-byte hash, is called the _block hash_ but is more accurately the _block header hash_, because only the block header is used to compute it. For example, the block hash of the first bitcoin block ever created is +000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f+. The block hash identifies a block uniquely and unambiguously and can be independently derived by any node by simply hashing the block header.