Topic: What is RBF in and how do you know that transaction doesn't use RBF? (Read 291 times)

It's just I haven't seen a non-RBF transaction with 4294967294 sequence, or I'm not searching hard enough.

Both 0xfffffffe and 0xffffffff disable RBF. 0xffffffff also disables nLocktime.
If you are decoding a transaction as you suggest, then sequence can't be 4294967295 or 4294967294.

In order to check whether a transaction is replaceable by fee or not, You can use blockstream explorer
If a transaction is RBF, Blockstream displays it at bottom of the page.

To make sure, you can decode that raw transaction and look for "sequence", if none is exactly "4294967295", it's replaceable.

......and how do we know an RBF transaction?

@tranthidung, just so you know, you might want to ease up on the "highlighting"... it doesn't play nicely with Dark Mode scripts

In Electrum, following those steps:
Tools > Preferences > Use Replace-by-Fees

ReplaceByFee is what I've actually been practicing but I don't really understand it the way you guys explain now. So, Many thanks

My transaction has been unconfirmed for a long time. What can I do?
Bitcoin transactions become “confirmed” when miners accept to write them in the Bitcoin blockchain. In general, the speed of confirmation depends on the fee you attach to your transaction; miners prioritize transactions that pay the highest fees.

Recent versions of Electrum use “dynamic fees” in order to make sure that the fee you pay with your transaction is adequate. This feature is enabled by default in recent versions of Electrum.

If you have made a transaction that is unconfirmed, you can:

Wait for a long time. Eventually, your transaction will either be confirmed or cancelled. This might take several days.

Increase the transaction fee. This is only possible for “replaceable” transactions. To create this type of transaction, you must have checked “Replaceable” on the send tab before sending the transaction. If you’re not seeing the “Replaceable” option on the send tab go to Tools menu > Preferences > Fees tab and set “Propose Replace-By-Fee” to “Always”. Transactions that are replaceable have the word “Replaceable” in the date column on the history tab. To increase the fee of a replaceable transaction right click on its entry on the history tab and choose “Increase Fee”. Set an appropriate fee and click on “OK”. A window will popup with the unsigned transaction. Click on “Sign” and then “Broadcast”.

Create a “Child Pays for Parent” transaction. A CPFP is a new transaction that pays a high fee in order to compensate for the small fee of its parent transaction. It can be done by the recipient of the funds, or by the sender, if the transaction has a change output. To create a CPFP transaction right click on the unconfirmed transaction on the history tab and choose “Child pays for parent”. Set an appropriate fee and click on “OK”. A window will popup with the unsigned transaction. Click on “Sign” and then “Broadcast”.

-snip- how do we know an RBF transaction?
Thanks.

Normally i'd suggest increase the transaction fee, but it's impossible since the transaction doesn't use RBF.