Definition
The coinbase transaction (not to be confused with the exchange Coinbase) is a special transaction that appears as the first entry in every Bitcoin block. Unlike regular transactions, it has no inputs from previous transactions. Instead, it creates new Bitcoin out of thin air as the block subsidy, plus collects all transaction fees from the block.
Miners can include arbitrary data in the coinbase transaction’s input field. Satoshi Nakamoto famously included a newspaper headline in the genesis block’s coinbase: a reference to bank bailouts. The extra nonce field in the coinbase is also used to expand the search space beyond the 32-bit header nonce.
In Simple Terms
The special first transaction in each block that creates new Bitcoin and pays the miner.
Coinbase Transaction is a term used in Bitcoin mining related to mining basics.
Also known as: Generation transaction.
The coinbase transaction (not to be confused with the exchange Coinbase) is a special transaction that appears as the first entry in every Bitcoin block. Unlike regular transactions, it has no inputs from previous transactions. Instead, it creates new Bitcoin out of thin air as the block subsidy, plus collects all transaction fees from the block.
Miners can include arbitrary data in the coinbase transaction’s input field. Satoshi Nakamoto famously included a newspaper headline in the genesis block’s coinbase: a reference to bank bailouts. The extra nonce field in the coinbase is also used to expand the search space beyond the 32-bit header nonce.
Understanding coinbase transaction is important for Bitcoin miners because it directly impacts mining operations, hardware selection, or profitability calculations. Whether you are a home miner running a Bitaxe or operating a larger ASIC setup, this concept helps inform better mining decisions.
Related terms: Block Reward, Block, Block Subsidy, Transaction Fees.