For years, users looking to speed up their transactions on the Bitcoin blockchain have relied on a convenient optional feature that essentially says, “I might like to replace this transaction with a higher fee.”
But what started as a useful tool has become redundant and a small privacy issue, prompting some developers to discuss possible ways to get rid of it.
Let’s first take a look at so-called replace-by-fee (RBF) signaling, and then discuss the developers’ proposals.
Replacement signaling by tax (RBF)
Imagine you send a paper check in the mail, but the postal system is saturated and congested. To ensure your payment doesn’t get stuck, the check has a small check box that says, “I reserve the right to void this check and write a new one with a higher rush fee if it is delayed.” ยป (The higher fees, of course, incentivize the postal system to prioritize your transaction.)
Such functionality is called Replace-by-Fee (RBF) in the Bitcoin ecosystem. For years, when you sent bitcoin, your wallet would let you press a button, signaling to the network that you might want to increase fees to speed up your transaction later.
