Segwit | Replace-by-Fee

Segwit Addresses

What are segwit addresses? Transactions that spend bitcoins secured by segregated witness (segwit) use less block weight than equivalent non-segwit (legacy) transactions, allowing segwit transactions to pay less total fee to achieve the same feerate as legacy transactions.

Tested: version 3.1.3 on iOS

Tested on: 2019-08-19

Receive support

  • Allows receiving to P2SH-wrapped segwit
    Allows the generation of P2SH-wrapped (either P2WPKH or P2WSH) segwit receiving addresses.
  • Does not allow receiving to bech32 segwit addresses
    Does not allow the generation of bech32 native (either P2WPKH or P2WSH) segwit receiving addresses.
  • Not tested: Can bech32m transaction outputs be received?
    We either didn’t test this or could not appropriately determine the results.
  • Default receiving address is P2SH-wrapped P2WSH
    This service generates P2SH-wrapped P2WSH segwit receiving addresses by default.

Send support

  • Allows sending to bech32 P2WPKH addresses
    Allows sending to bech32 P2WPKH native segwit addresses.
  • Allows sending to bech32 P2WSH addresses
    Allows sending to bech32 P2WSH native segwit addresses.
  • Not tested: Can transaction outputs be sent to bech32m addresses?
    We either didn’t test this or could not appropriately determine the results.
  • Does not create bech32 change addresses
    When sending, does not generate bech32 (either P2WPKH or P2WSH) segwit change addresses.

Usability

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Coino only receives to P2SH-wrapped P2WSH addresses.
Coino only receives to P2SH-wrapped P2WSH addresses.

Conio allows sending to any segwit v0 bech32 address.
Conio allows sending to any segwit v0 bech32 address.


Replace-by-Fee (RBF)

What is 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.

Tested: version 2.5.6 on iOS

Tested on: 2018-10-31

Receiving support

  • Notification does not note RBF
    Notification of incoming transaction does not note that the transaction signals RBF.
  • 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 transaction(s) are shown in the transaction list.

Sending support

  • Signals BIP125 replaceability 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: Are replacement and original sent transactions displayed?
    We were not able to test this because sending a BIP125 signaling transaction is not supported.

Usability

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Sending RBF Transaction - Default send transaction screen. No RBF options. Transaction is sent with RBF signaled.
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 - 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 - 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 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 - Transaction details of incoming transaction. No RBF signaled. “Receive Faster” for CPFP.

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

Bumping RBF Transaction - Transaction details showing Receive Faster options.
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 - 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 - 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 - After replacement transaction confirms, the original is removed from the list.

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