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 - Default wallet send screen

Sending RBF Transaction - Send transaction, choose miner fees. No RBF options.

Bumping RBF Transaction - Transaction not sent with RBF signal. No bumping possible.

Receiving RBF Transaction - Email notification. No RBF warning.

Receiving RBF Transaction - Incoming RBF transaction in list. No label for RBF.

Receiving RBF Transaction - Incoming RBF transaction details. No RBF flag.

Receiving Bumped RBF Transaction - Incoming bumped transaction. Both transactions show. Balance credited twice.

Receiving Bumped RBF Transaction - Dashboard shows 2 incoming transaction. Balance includes both transactions.

Receiving Bumped RBF Transaction - Additional email notification for bumped transaction.

Receiving Bumped RBF Transaction - Even after bumped transaction has 100 confirms, original transaction stays pending.