Paying a transaction fee is optional. Miners can choose which transactions to process, and they are incentivised to prioritize those that pay higher fees. Because the size of mined blocks is capped by the network, miners choose transactions based on the fee paid relative to their storage size, not the absolute amount of money paid as a fee. Thus, fees are generally measured in satoshis per byte, or sat/b. The size of transactions is dependent on the number of inputs used to create the transaction, and the number of outputs

Transaction fees

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