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

• No unconfirmed transactions
  Neither the original nor replacement transactions are shown in the transaction list. Most likely unconfirmed transactions are not supported

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 send screen. No RBF options.

Sending RBF Transaction - Miner fee detail options

Sending RBF Transaction - Fee level dropdown options

Sending RBF Transaction - Dialog box for custom fee level

Bumping RBF Enabled Transaction - Transactions list

Bumping RBF Enabled Transaction - Transaction details of sent transaction. No bumping available. NOTE Transactions not sent with RBF enabled.

Bumping RBF Enabled Transaction - Transactions details screen of sent transaction with “Amount too low to spend” warning message. Learn more link goes here. Error message doesn’t make sense given a ~$7 transactions size. Note fee was 3 sat/byle.

Receiving RBF Transaction - Transaction list does not show any unconfirmed transactions.

Receiving RBF Transaction - Transaction details do not show that the transaction was RBF enabled.