How Bitcoin Transaction Fees Work: Size, Fee Rates, and UTXO Model Explained

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Bitcoin transaction fees differ fundamentally from account-based blockchains because they are calculated using the UTXO model, where fees are based on transaction data size measured in virtual bytes rather than the amount transferred. The fee is determined implicitly by the difference between total input value and total output value, with leftover satoshis going to the miner. Developers building on Bitcoin must explicitly set a fee rate in sat/vB when constructing raw transactions. Best practices include dynamically querying mempool APIs for current fee estimates, implementing Replace-By-Fee signaling to allow fee bumping on stuck transactions, and avoiding dust outputs that fall below the network's minimum relay threshold.

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