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myarbrough@oreilly.com 2014-11-19 09:41:32 -08:00
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@ -686,7 +686,7 @@ Note that the target difficulty is independent of the number of transactions or
((("consensus","mining blocks successfully")))As we saw earlier, Jing's node has constructed a candidate block and prepared it for mining. Jing has several hardware mining rigs with((("application-specific integrated circuits"))) application-specific integrated circuits, where hundreds of thousands of integrated circuits run the SHA256 algorithm in parallel at incredible speeds. These specialized machines are connected to his mining node over USB. Next, the mining node running on Jing's desktop transmits the block header to his mining hardware, which starts testing trillions of nonces per second.
Almost 11 minutes after starting to mine block 277,316, one of the hardware mining machines finds a solution and sends it back to the mining node. The nonce 4,215,469,401 when inserted into the block header produces a block hash of +0000000000000002a7bbd25a417c0374cc55261021e8a9ca74442b01284f0569+, which is less than the target of +0000000000000003A30C00000000000000000000000000000000000000000000+.
Almost 11 minutes after starting to mine block 277,316, one of the hardware mining machines finds a solution and sends it back to the mining node. When inserted into the block header, the nonce 4,215,469,401 produces a block hash of +0000000000000002a7bbd25a417c0374cc55261021e8a9ca74442b01284f0569+, which is less than the target of +0000000000000003A30C00000000000000000000000000000000000000000000+.
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 block chain, 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.