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@ -410,7 +410,7 @@ With all the other fields filled, the block header is now complete and the proce
=== Mining the Block
Now that a candidate block has been constructed by Jing's node, it is time for Jing's hardware mining rig to "mine" the block, to find a solution to the Proof-of-Work algorithm that makes the block valid. Throughout this book we have studied cryptographic hash functions as used in various aspects of the bitcoin system. The hash function SHA256 is the function used in bitcoin's mining process.
((("mining and consensus", "mining the block", id="MACmining10")))Now that a candidate block has been constructed by Jing's node, it is time for Jing's hardware mining rig to "mine" the block, to find a solution to the Proof-of-Work algorithm that makes the block valid. Throughout this book we have studied cryptographic hash functions as used in various aspects of the bitcoin system. The hash function SHA256 is the function used in bitcoin's mining process.
In the simplest terms, mining is the process of hashing the block header repeatedly, changing one parameter, until the resulting hash matches a specific target. The hash function's result cannot be determined in advance, nor can a pattern be created that will produce a specific hash value. This feature of hash functions means that the only way to produce a hash result matching a specific target is to try again and again, randomly modifying the input until the desired hash result appears by chance.
@ -709,7 +709,7 @@ which is less than the target:
Immediately, Jing's mining node transmits the block to all its peers. They receive, validate, and then propagate the new block. As the block ripples out across the network, each node adds it to its own copy of the blockchain, extending it to a new height of 277,316 blocks. As mining nodes receive and validate the block, they abandon their efforts to find a block at the same height and immediately start computing the next block in the chain, using Jing's block as the "parent". By building on top of Jing's newly discovered block, the other miners are essentially "voting" with their mining power and endorsing Jing's block and the chain which it extends.
In the next section, we'll look at the process each node uses to validate a block and select the longest chain, creating the consensus that forms the decentralized blockchain.
In the next section, we'll look at the process each node uses to validate a block and select the longest chain, creating the consensus that forms the decentralized blockchain.((("", startref="MACmining10")))
=== Validating a New Block