Replace-by-Fee (RBF)

An unconfirmed transaction can be replaced by another version of the same transaction that spends the same inputs. Most full nodes support this if the earlier transaction enables BIP125 signaling and the replacement transaction increases the amount of fee paid. In terms of block chain space used, this is the most efficient form of fee bumping.

Receiving support

• Notification does not note RBF
  Notification of incoming transaction does not note that the transaction is RBF signaling

• Received transaction not labeled replaceable in list
  Does not visually indicate that an incoming transaction has signaled RBF

• Received transaction not labeled replaceable in transaction details
  Does not visually indicate that a received transaction has signaled RBF when viewing the transaction details

• Shows replacement and original transactions
  Both the original transaction and replacement transactions are shown in the transaction list

Sending support

• Signals BIP125 replacability when sending transactions
  Allows sending of BIP125 opt-in-RBF transactions in the interface

• Sent transaction not labeled replaceable in list
  Does not visually indicate that an outgoing transaction has signaled RBF

• Sent transaction not labeled replaceable in transaction details
  Does not visually indicate that a sent transaction has signaled RBF when viewing the transaction details

• Not tested
  We either didn’t test this or could not appropriately determine the results

Usability

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Sending RBF Transaction - Default send transaction screen. No RBF options. Transaction is sent with RBF signaled.

Bumping RBF Transaction - Transaction details screen for a sent and unconfirmed transaction. Cannot get Send Faster button enabled even when funds to bump are available.

Bumping RBF Transaction - Notice of incoming transaction. No RBF flag.

Bumping RBF Transaction - Transaction list screen showing incoming RBF enabled transaction. No RBF flag.

Bumping RBF Transaction - Transaction details of incoming transaction. No RBF signaled. “Receive Faster” for CPFP.

Bumping RBF Transaction - More transaction details.

Bumping RBF Transaction - More transaction details. After a period of time the Receive Faster button was now enabled.

Bumping RBF Transaction - Transaction details showing Receive Faster options.

Receiving Bumped RBF Transaction - Receiving bumped transaction shows “Incoming” amount as the sum of the original and replacement transaction.

Receiving Bumped RBF Transaction - Both original and replacement transaction show in transaction list screen.

Receiving Bumped RBF Transaction - After replacement transaction confirms, the original is removed from the list.

Receiving Bumped RBF Transaction - Additional transaction details available once transaction was confirmed.