What is transaction fees?
Transaction fees are the bitcoin that users attach to transactions to have them mined. The miner of a block keeps all the fees in it.
How it works
Block space is limited, so transactions compete for it by fee rate, measured in satoshis per virtual byte. Miners fill their blocks with the best-paying transactions waiting in the mempool.
Why it matters
Fees are usually a small part of the block reward and occasionally a very large one. They are the part of mining revenue that does not halve.
Related terms
All terms: the Bitcoin mining glossary.
Mining Disrupt 2027 tickets and passesMining Disrupt 2027 agendaMining Disrupt 2027 FAQ
Three days. One floor. The whole industry.
March 22–24, 2027 · Irving Convention Center · Dallas
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