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

  • Does not signal BIP125 replacability when sending transactions
    Does not allow 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
  • No replacements in transaction list
    Because no transaction replacement is possible, we could not test whether original or replacement sent transactions are shown after replacement

Usability

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Sending RBF Transaction - Transaction send default screen. No options for RBF here or in settings menus.
Sending RBF Transaction - Transaction send default screen. No options for RBF here or in settings menus.

Sending RBF Transaction - Transaction send screen with fee options expanded. No options for RBF. Toggle for fee priority.
Sending RBF Transaction - Transaction send screen with fee options expanded. No options for RBF. Toggle for fee priority.

Sending RBF Transaction - Transaction send confirmation prompt.
Sending RBF Transaction - Transaction send confirmation prompt.

Bumping RBF Enabled Transaction - No ability to bump transaction fee found. Note Transaction not sent with RBF enabled.
Bumping RBF Enabled Transaction - No ability to bump transaction fee found. Note Transaction not sent with RBF enabled.

Receiving RBF Transaction - No RBF flag on transaction list screen.
Receiving RBF Transaction - No RBF flag on transaction list screen.

Receiving RBF Transaction - No RBF flag on transaction details screen.
Receiving RBF Transaction - No RBF flag on transaction details screen.

Receiving Bumped RBF Transaction - On transaction list screen, original transaction shows normal, bumped transaction shows with “Failed” message.
Receiving Bumped RBF Transaction - On transaction list screen, original transaction shows normal, bumped transaction shows with “Failed” message.

Receiving RBF Transaction - Transaction list screen no longer shows original transaction after the bumped transaction confirms.
Receiving RBF Transaction - Transaction list screen no longer shows original transaction after the bumped transaction confirms.

Receiving RBF Transaction - Transaction details of the bumped, confirmed, transaction. No RBF flag or reference to original transaction.
Receiving RBF Transaction - Transaction details of the bumped, confirmed, transaction. No RBF flag or reference to original transaction.