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 3.1.8 on iOS

Tested on: 2019-07-24

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 P2WPKH
    This service generates P2SH-wrapped P2WPKH 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

Click on a thumbnail for a larger image or to play its video.

Green generates only P2SH wrapped segwit addresses.
Green generates only P2SH wrapped segwit addresses.

Green can send to all variants of bech32 addresses for v0.
Green can send to all variants of bech32 addresses for v0.


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 0.0.52 on iOS

Tested on: 2018-09-25

Receiving support

  • No notification
    There are no incoming transaction notifications for this service.
  • Received transaction labeled replaceable in list
    Visually indicates 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 labeled replaceable in list
    Visually indicates 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.
  • Shows replacement and original transactions
    Both the original transaction and replacement transactions are shown in the transaction list.

Usability

Click on a thumbnail for a larger image or to play its video.

Sending Transaction - Sending with transaction replacement is “ON” under Settings by default.
Sending Transaction - Sending with transaction replacement is “ON” under Settings by default.

Sending Transaction - Default Send transaction screen.
Sending Transaction - Default Send transaction screen.


Sending Transaction - Advanced details on send transaction screen.
Sending Transaction - Advanced details on send transaction screen.

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


Sending Transaction - Transaction list showing “bump fee” option for unconfirmed transaction.
Sending Transaction - Transaction list showing “bump fee” option for unconfirmed transaction.

Sending Transaction - Transaction details. RBF replaceable not flagged.
Sending Transaction - Transaction details. RBF replaceable not flagged.


Attempting Transaction Replacement - Bump fee context menu options.
Attempting Transaction Replacement - Bump fee context menu options.

Attempting Transaction Replacement - Bump transaction details confirmation. Notes “Previous fee:” field as well as language about bumping.
Attempting Transaction Replacement - Bump transaction details confirmation. Notes “Previous fee:” field as well as language about bumping.


Attempting Transaction Replacement - 2FA prompted for replacement transactions as well.
Attempting Transaction Replacement - 2FA prompted for replacement transactions as well.

Attempting Transaction Replacement - Transaction list with replacement transaction on top. Bump fee available again. Show replaced transaction button shows as well.
Attempting Transaction Replacement - Transaction list with replacement transaction on top. Bump fee available again. Show replaced transaction button shows as well.


Attempting Transaction Replacement - Transaction list with replacement transactions “show replaced” button clicked. NOTE while testing, I inadvertently bumped twice so 2 replacement transactions appear here.
Attempting Transaction Replacement - Transaction list with replacement transactions “show replaced” button clicked. NOTE while testing, I inadvertently bumped twice so 2 replacement transactions appear here.

Attempting Transaction Replacement - Original transaction as viewed from the “show replaced” list. “Double spend by txhash” field has “update” value.
Attempting Transaction Replacement - Original transaction as viewed from the “show replaced” list. “Double spend by txhash” field has “update” value.


Attempting Transaction Replacement - Replacement “bumped” transaction. “Double spend by txhash” field has “update” value.
Attempting Transaction Replacement - Replacement “bumped” transaction. “Double spend by txhash” field has “update” value.

Attempting Transaction Replacement - Subsequent bumping on the same transaction has a different “bump fee” context menu options. Also the context menu notes “fee already at 1-conf-estimate level”.
Attempting Transaction Replacement - Subsequent bumping on the same transaction has a different “bump fee” context menu options. Also the context menu notes “fee already at 1-conf-estimate level”.


Receiving Transaction Signaling RBF - Transaction List Screen. “Replaceable” noted.
Receiving Transaction Signaling RBF - Transaction List Screen. “Replaceable” noted.

Receiving Transaction Signaling RBF - Transaction details do not flag RBF (or unconfirmed).
Receiving Transaction Signaling RBF - Transaction details do not flag RBF (or unconfirmed).


Receiving Transaction Signaling RBF - Transaction details do not flag RBF (or unconfirmed).
Receiving Transaction Signaling RBF - Transaction details do not flag RBF (or unconfirmed).

Receiving Replacement Transaction - Transaction List Screen. Notes RBF(“replaceable”) transaction as well as double spend transaction. The replacement transaction also shows up as separate.
Receiving Replacement Transaction - Transaction List Screen. Notes RBF(“replaceable”) transaction as well as double spend transaction. The replacement transaction also shows up as separate.


Receiving Replacement Transaction - Transaction details for replacement transaction. No RBF note or double spend note. Does show “double spend by txhash” field which points to original transaction.
Receiving Replacement Transaction - Transaction details for replacement transaction. No RBF note or double spend note. Does show “double spend by txhash” field which points to original transaction.

Receiving Replacement Transaction - Transaction details for replacement transaction. No RBF note or double spend note. Does show “double spend by txhash” field which points to original transaction.
Receiving Replacement Transaction - Transaction details for replacement transaction. No RBF note or double spend note. Does show “double spend by txhash” field which points to original transaction.


Receiving Replacement Transaction - Transaction details for original transaction. No RBF note or double spend note. Does show “double spend by txhash” field which points to new replacement transaction.
Receiving Replacement Transaction - Transaction details for original transaction. No RBF note or double spend note. Does show “double spend by txhash” field which points to new replacement transaction.

Receiving Replacement Transaction - Transaction details for original transaction. No RBF note or double spend note. Does show “double spend by txhash” field which points to new replacement transaction.
Receiving Replacement Transaction - Transaction details for original transaction. No RBF note or double spend note. Does show “double spend by txhash” field which points to new replacement transaction.


Receiving Replacement Transaction - Transaction list after the replacement transaction confirms. “Original” transaction doesn’t appear.
Receiving Replacement Transaction - Transaction list after the replacement transaction confirms. “Original” transaction doesn’t appear.

Receiving Replacement Transaction - Transaction details for confirmed, replacement transaction. No note of double spend or RBF. “double spend by txhash” field disappears.
Receiving Replacement Transaction - Transaction details for confirmed, replacement transaction. No note of double spend or RBF. “double spend by txhash” field disappears.