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 5.11.1 on iOS

Tested on: 2019-04-11

Receive support

  • Does not allow receiving to P2SH-wrapped segwit
    Does not allow 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.
  • Default receiving address is P2PKH
    This service generates legacy P2PKH receiving addresses by default.

Send support

  • Does not allow sending to bech32 P2WPKH addresses
    Does not allow sending to bech32 P2WPKH native segwit addresses.
  • Does not allow sending to bech32 P2WSH addresses
    Does not allow sending to bech32 P2WSH native segwit addresses.
  • Not tested: Can bech32 addresses be used for change?
    We either didn’t test this or could not appropriately determine the results.

Usability

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Abra uses P2PKH addresses for receiving.
Abra uses P2PKH addresses for receiving.

Abra allows a bech32 address to be input and does not provide a warning. However, the review button was not enabled until a non-bech32 address was provided. The eventually sent transaction used exact change so change address format was not determined.
Abra allows a bech32 address to be input and does not provide a warning. However, the review button was not enabled until a non-bech32 address was provided. The eventually sent transaction used exact change so change address format was not determined.


When using the QR code scanner, an error about address format was shown when scanning a bech32 address.
When using the QR code scanner, an error about address format was shown when scanning a bech32 address.

When using a non bech32 address, the "Review" button is enabled. Button is disabled when using bech32 address format.
When using a non bech32 address, the “Review” button is enabled. Button is disabled when using bech32 address format.


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 5.4.0 on iOS

Tested on: 2018-12-06

Receiving support

  • No notification
    There are no incoming transaction notifications for this service.
  • 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. Unconfirmed transactions are probably 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.
  • Not tested: Does transaction list show whether sent transactions signal RBF?
    We were not able to test this because sending a BIP125 signaling transaction is not supported.
  • Not tested: Does transaction details page show whether received transaction signals RBF?
    We were not able to test this because sending a BIP125 signaling transaction is not supported.
  • 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 Transaction - Default send transaction screen.
Sending Transaction - Default send transaction screen.

Sending Transaction - Send transaction confirmation screen.
Sending Transaction - Send transaction confirmation screen.


Sending Transaction - Network fee notice details.
Sending Transaction - Network fee notice details.

Sending Transaction - Transaction list screen showing sent transaction. No RBF notice.
Sending Transaction - Transaction list screen showing sent transaction. No RBF notice.


Sending Transaction - Sent transaction details. No RBF notice. Note transaction sent without RBF flag. Transaction was not sent with RBF so no bumping available.
Sending Transaction - Sent transaction details. No RBF notice. Note transaction sent without RBF flag. Transaction was not sent with RBF so no bumping available.

Receiving Transaction Signaling RBF - Abra does not show unconfirmed transactions.
Receiving Transaction Signaling RBF - Abra does not show unconfirmed transactions.


Receiving Replacement Transaction - When the replacement transaction receives 1 confirmation it appears in wallet. No RBF notice.
Receiving Replacement Transaction - When the replacement transaction receives 1 confirmation it appears in wallet. No RBF notice.

Receiving Replacement Transaction - Transaction list screen. No RBF flag.
Receiving Replacement Transaction - Transaction list screen. No RBF flag.


Receiving Replacement Transaction - Replacement transaction details.
Receiving Replacement Transaction - Replacement transaction details.