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BIP 125 (Replace-by-Fee)
2,100 sats
Bitcoin Improvement Proposal (BIP) 125 introduces Replace-by-Fee (RBF) to Bitcoin. This soft fork enables users to replace an unconfirmed transaction with a similar transaction paying a larger fee. Some Bitcoin wallets, such as Electrum, now allow users to use RBF. When a transaction is broadcast, it pays a defined fee to the miner of that transaction. If the fee is too low, miners will defer mining that transaction in favor of other transactions which paid higher fees. In order to speed up a transaction’s confirmation, a user can take advantage of RBF to increase the fee of their transaction. Nodes following BIP 125 will accept the new transaction and remove the older version from their mempool. Before BIP 125, Bitcoin nodes would automatically reject a transaction which attempted to spend UTXOs already spent in a different transaction in their mempool. BIP 125 created a caveat to that rule. However, a transaction must opt into RBF in its first version to make RBF possible. This is done using the sequence, a previously unused field of a transaction input.
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