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duplicate word (typo)

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Andreas M. Antonopoulos 2017-02-18 11:12:38 +07:00 committed by GitHub
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@ -722,7 +722,7 @@ When a node receives a new block, it will validate the block by checking it agai
* The block header hash is less than the target (enforces the proof of work)
* The block timestamp is less than two hours in the future (allowing for time errors)
* The block size is within acceptable limits
* The first transaction (and only the first) is a coinbase coinbase transaction
* The first transaction (and only the first) is a coinbase transaction
* All transactions within the block are valid using the transaction checklist discussed in <<tx_verification>>
The independent validation of each new block by every node on the network ensures that the miners cannot cheat. In previous sections we saw how the miners get to write a transaction that awards them the new bitcoin created within the block and claim the transaction fees. Why don't miners write themselves a transaction for a thousand bitcoin instead of the correct reward? Because every node validates blocks according to the same rules. An invalid coinbase transaction would make the entire block invalid, which would result in the block being rejected and, therefore, that transaction would never become part of the ledger. The miners have to construct a perfect block, based on the shared rules that all nodes follow, and mine it with a correct solution to the proof of work. To do so, they expend a lot of electricity in mining, and if they cheat, all the electricity and effort is wasted. This is why independent validation is a key component of decentralized consensus.