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judymcconville@roadrunner.com 2017-05-02 10:54:28 -07:00
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@ -326,7 +326,7 @@ In a coinbase transaction, the first two fields are set to values that do not re
((("mining and consensus", "aggregating transactions into blocks", "coinbase data")))Coinbase transactions do not have an unlocking script (a.k.a., +scriptSig+) field. Instead, this field is replaced by coinbase data, which must be between 2 and 100 bytes. Except for the first few bytes, the rest of the coinbase data can be used by miners in any way they want; it is arbitrary data. ((("mining and consensus", "aggregating transactions into blocks", "coinbase data")))Coinbase transactions do not have an unlocking script (a.k.a., +scriptSig+) field. Instead, this field is replaced by coinbase data, which must be between 2 and 100 bytes. Except for the first few bytes, the rest of the coinbase data can be used by miners in any way they want; it is arbitrary data.
((("nonce values")))In the genesis block, for example, Satoshi Nakamoto added the text "The Times 03/Jan/2009 Chancellor on brink of second bailout for banks" in the coinbase data, using it as a proof of the date and to convey a message. Currently, miners use the coinbase data to include extra nonce values and strings identifying the mining pool. ((("nonce values")))((("blocks", "genesis block")))((("blockchain technology", "genesis block")))((("genesis block")))In the genesis block, for example, Satoshi Nakamoto added the text "The Times 03/Jan/2009 Chancellor on brink of second bailout for banks" in the coinbase data, using it as a proof of the date and to convey a message. Currently, miners use the coinbase data to include extra nonce values and strings identifying the mining pool.
The first few bytes of the coinbase used to be arbitrary, but that is no longer the case. As per Bitcoin Improvement Proposal 34 (BIP-34), version-2 blocks (blocks with the version field set to 2) must contain the block height index as a script "push" operation in the beginning of the coinbase field. The first few bytes of the coinbase used to be arbitrary, but that is no longer the case. As per Bitcoin Improvement Proposal 34 (BIP-34), version-2 blocks (blocks with the version field set to 2) must contain the block height index as a script "push" operation in the beginning of the coinbase field.