Coinbase - terminology

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The coinbase is the term used for the first transaction in a new bitcoin block. To be valid, a block must contain a single coinbase. The output of the coinbase transaction is used to pay the miner who created the block. Since the transaction is original to the block, the transaction input is termed the coinbase field and may be used freely by the miner.[1][2]

References

  1. What is the coinbase?. Stack Exchange Network.
  2. Coinbase, Coinbase Field. Bitcoin.org.