Each bitcoin transaction has an optional fee set by the party issuing the transaction. The miner, or mining pool, solving the block containing the new transacti

Each bitcoin transaction has an optional fee set by the party issuing the transaction. The miner, or mining pool, solving the block containing the new transaction is awarded the fee. At the moment bitcoin mining is all about solving blocks from newly created bitcoins. When they are gone, then bitcoin mining will be all about collecting transaction fees.