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Topic: All about "stuck" transactions and what you can do to fix them (Read 140042 times)
Need help with this transaction, anybody who can accelerate it, drop your btc address and will pay $20 for the help.
3d63638bebb30c484e34975e2de2d6b015d4a68126ea48873da3bd3df09333ef
If you have control over any of the receiving addresses, you can do CPFP.3d63638bebb30c484e34975e2de2d6b015d4a68126ea48873da3bd3df09333ef
In CPFP (Child pays for parent), you spend the fund received in the unconfirmed transaction in a new transaction with high fee, so that miners include both transactions (the child and the parent) in the same block.
Take note that to do CPFP, you must spend the same coin you received in the unconfirmed transaction and you won't change anything with your unconfirmed transaction, if you spend other coins assosiated with the same address.
If you have control over any of the receiving addresses, but your wallet doesn't allow you to spend unconfirmed coins, you can import your wallet in electrum.
In electrum, you can simply click on your unconfirmed transaction and select "CPFP".
Electrum official website: electrum.org
Need help with this transaction, anybody who can accelerate it, drop your btc address and will pay $20 for the help.
3d63638bebb30c484e34975e2de2d6b015d4a68126ea48873da3bd3df09333ef
3d63638bebb30c484e34975e2de2d6b015d4a68126ea48873da3bd3df09333ef
-snip-
Question: is there a way i can make sure that my broadcast transaction in the mempool won't be replaced by anybody? (someone may have the same private key i have)Or is it still a race like you said?
Take note that there's no single Bitcoin mempool, each node has their own mempool.
Since each node has their own mempool, they have the control whether to accept the replacement to their mempool or not.
In a scenario when someone broadcast a replacement to your transaction with priority fee,
it's a matter of which one will propagate (to more nodes) to quickly reach a miners mempool that could get it included to the next block.
BTW, question like this deserves a new topic since it's not related to the topic,
If the main reason is you want to reach a certain user, you may use @username to mention them, most users respond to that.
-edit typo-
"Faulty" because even if most nodes wont accept a replacement of it by default, there's no stopping anyone to remove it from their mempool and accept the replacement instead.
It's a race on which one to reach the miners' (pool or solo) node to get included to the blockchain. It's also up to them which transaction to include to the block their mining.
If more of saying "it may not be replaced" than "it will not be replaced".
It was mainly used by centralized service to implement zero-fee deposits with low risk on their part
but since they are custodial, they are still in control of what their users can withdraw from their service in case the unconfirmed transaction is replaced.
In your case, you mustn't assume that it's safe.
And speaking of mempoolrbf option a.k.a. "full-rbf".
If a node enabled the option, it will accept replacements regardless if nSequence field of the transaction is 0xffffffff or 0xffffffff -1.
I've tested this before and I can say that it's now easy to replace an unconfirmed transaction without opt-in-rbf flag as long a you can broadcast the replacement to nodes that accept it.
(with the right conditions)
i think it makes a lot of sense here.
Question: is there a way i can make sure that my broadcast transaction in the mempool won't be replaced by anybody? (someone may have the same private key i have)
Or is it still a race like you said?
Thank you.
If I set nSequence to be 0xffffffff and broadcast that transaction. Will it be considered safe as nobody can double-spend it before it's getting into the block? Thank you.
That was the faulty assumption before "mempoolrbf" option is implemented."Faulty" because even if most nodes wont accept a replacement of it by default, there's no stopping anyone to remove it from their mempool and accept the replacement instead.
It's a race on which one to reach the miners' (pool or solo) node to get included to the blockchain. It's also up to them which transaction to include to the block their mining.
If more of saying "it may not be replaced" than "it will not be replaced".
It was mainly used by centralized service to implement zero-fee deposits with low risk on their part
but since they are custodial, they are still in control of what their users can withdraw from their service in case the unconfirmed transaction is replaced.
In your case, you mustn't assume that it's safe.
And speaking of mempoolrbf option a.k.a. "full-rbf".
If a node enabled the option, it will accept replacements regardless if nSequence field of the transaction is 0xffffffff or 0xffffffff -1.
I've tested this before and I can say that it's now easy to replace an unconfirmed transaction without opt-in-rbf flag as long a you can broadcast the replacement to nodes that accept it.
(with the right conditions)
-snip-
-snip-
OP must be referring to BIP125 (Opt-in Full RBF Signaling), a.k.a. "rbf" since nLocktime has nothing to do with transaction replacement.BIP-0125: Opt-in Full Replace-by-Fee Signaling
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If I set nSequence to be 0xffffffff and broadcast that transaction.
I think this is a regular transaction cause the nSequence is the UNIT_MAX. It ignores nlocktime[1] and RBF, so it cannot be double spent by you.[1] https://en.bitcoin.it/wiki/NLockTime
- Jay -
Thanks. But does it also mean that anybody else won't be able to double spend it even if they have the private key?
The response of the transaction, when you want to double-spend, is determined by the nSeqequence you use and if the nSequence is equal or less than UINT_MAX (0xffffffff) the nLockTime will automatically ignored which means the transaction will not be accepted into any block.
If I set nSequence to be 0xffffffff and broadcast that transaction.
I think this is a regular transaction cause the nSequence is the UNIT_MAX. It ignores nlocktime[1] and RBF, so it cannot be double spent by you.[1] https://en.bitcoin.it/wiki/NLockTime
- Jay -
Thanks. But does it also mean that anybody else won't be able to double spend it even if they have the private key?
If I set nSequence to be 0xffffffff and broadcast that transaction.
I think this is a regular transaction cause the nSequence is the UNIT_MAX. It ignores nlocktime[1] and RBF, so it cannot be double spent by you.[1] https://en.bitcoin.it/wiki/NLockTime
- Jay -
Hi Chow101,
If I set nSequence to be 0xffffffff and broadcast that transaction. Will it be considered safe as nobody can double-spend it before it's getting into the block? Thank you.
If I set nSequence to be 0xffffffff and broadcast that transaction. Will it be considered safe as nobody can double-spend it before it's getting into the block? Thank you.
Hi Chow101,
I have a question here regarding the stuck transaction. If I previously broadcast a transaction through my own node with a fee low enough that has not been confirmed for almost 10 months.
Will it always be there until it's confirmed? is there a rule that after some certain time that passed, an unconfirmed transaction will be dropped out?
The default mempool policy will drop a transaction if it has been in the mempool for more than 2 weeks.I have a question here regarding the stuck transaction. If I previously broadcast a transaction through my own node with a fee low enough that has not been confirmed for almost 10 months.
Will it always be there until it's confirmed? is there a rule that after some certain time that passed, an unconfirmed transaction will be dropped out?
However, this does not mean that the transaction is canceled or otherwise invalid. It can still be re-broadcast by anyone and therefore be accepted back into nodes' mempools after it has been kicked out. If you are using the Bitcoin Core wallet, it will attempt to rebroadcast any of its own unconfirmed transactions every 24 hours.
Hi Chow101,
I have a question here regarding the stuck transaction. If I previously broadcast a transaction through my own node with a fee low enough that has not been confirmed for almost 10 months.
Will it always be there until it's confirmed? is there a rule that after some certain time that passed, an unconfirmed transaction will be dropped out?
I have a question here regarding the stuck transaction. If I previously broadcast a transaction through my own node with a fee low enough that has not been confirmed for almost 10 months.
Will it always be there until it's confirmed? is there a rule that after some certain time that passed, an unconfirmed transaction will be dropped out?
Is it possible to tell your own node to forget the transaction, then connect to your node from electrum, for example, to resend it?
No.That wouldn't really do anything useful, and would be misleading. The user might think a transaction has been dropped and a new one propagated, but in actuality, only their own node knows about the new transaction and it has not been propagated to other nodes since you cannot force other nodes to drop a transaction.
Is it possible to tell your own node to forget the transaction, then connect to your node from electrum, for example, to resend it?
January 28, 2024, 03:17:44 AM
@achow101
You made a mistake with the hyperlink under the The difference between the types of RBF transactions heading. The code isn't right, and it currently shows as [urlhttps://github.com/bitcoin/bips/blob/master/bip-0125.mediawiki]BIP 125[/url]. Please add "=" in the appropriate place to make it a proper hyperlink: BIP 125
You made a mistake with the hyperlink under the The difference between the types of RBF transactions heading. The code isn't right, and it currently shows as [urlhttps://github.com/bitcoin/bips/blob/master/bip-0125.mediawiki]BIP 125[/url]. Please add "=" in the appropriate place to make it a proper hyperlink: BIP 125
December 19, 2023, 07:17:21 PM
This content still holds true for a older version of Electrum wallet and it might be needed by Users of older versions of Electrum.
However, the new Version now supports an Automatic RBF inclusion for every transaction made so there's always a chance to replace or simply Bump transaction fee if the need arises for all Electrum Wallet Users
Updated to say that opt in RBF is always on.However, the new Version now supports an Automatic RBF inclusion for every transaction made so there's always a chance to replace or simply Bump transaction fee if the need arises for all Electrum Wallet Users
Can my name please be removed from the OP? I have not been able to help with stuck transactions for years and still receive messages asking for help
Done. Updated that section in general to point to the services rather than to specific people. 
December 19, 2023, 02:51:14 PM
Electrum
To create a transaction that can be replaceable, go to Tools > Preferences and check the box "Enable Replace-By-Fee". Then when you want to send some Bitcoin, next to the Fee slider is a box labeled "Replaceable". Check that box so that while the transaction is still unconfirmed you can replace the transaction with one that pays a higher fee.
To increase the fee of a transaction that uses Opt-In RBF, right click the transaction in the history list and choose the "Increase Fee" option.
To create a transaction that can be replaceable, go to Tools > Preferences and check the box "Enable Replace-By-Fee". Then when you want to send some Bitcoin, next to the Fee slider is a box labeled "Replaceable". Check that box so that while the transaction is still unconfirmed you can replace the transaction with one that pays a higher fee.
To increase the fee of a transaction that uses Opt-In RBF, right click the transaction in the history list and choose the "Increase Fee" option.
This content still holds true for a older version of Electrum wallet and it might be needed by Users of older versions of Electrum.
However, the new Version now supports an Automatic RBF inclusion for every transaction made so there's always a chance to replace or simply Bump transaction fee if the need arises for all Electrum Wallet Users
Can my name please be removed from the OP? I have not been able to help with stuck transactions for years and still receive messages asking for help
I'm so sorry, I have been promoting you for years as the person who has some access to f2pool and can accelerate bitcoin transactions 
I couldn't imagine if my marketing was so successful. December 19, 2023, 02:25:36 PM
Can my name please be removed from the OP? I have not been able to help with stuck transactions for years and still receive messages asking for help
December 18, 2023, 02:55:19 PM
Electrum
To create a transaction that can be replaceable, go to Tools > Preferences and check the box "Enable Replace-By-Fee". Then when you want to send some Bitcoin, next to the Fee slider is a box labeled "Replaceable". Check that box so that while the transaction is still unconfirmed you can replace the transaction with one that pays a higher fee.
To increase the fee of a transaction that uses Opt-In RBF, right click the transaction in the history list and choose the "Increase Fee" option.
To create a transaction that can be replaceable, go to Tools > Preferences and check the box "Enable Replace-By-Fee". Then when you want to send some Bitcoin, next to the Fee slider is a box labeled "Replaceable". Check that box so that while the transaction is still unconfirmed you can replace the transaction with one that pays a higher fee.
To increase the fee of a transaction that uses Opt-In RBF, right click the transaction in the history list and choose the "Increase Fee" option.
This content still holds true for a older version of Electrum wallet and it might be needed by Users of older versions of Electrum.
However, the new Version now supports an Automatic RBF inclusion for every transaction made so there's always a chance to replace or simply Bump transaction fee if the need arises for all Electrum Wallet Users
December 14, 2017, 02:06:56 PM
This is not the place to ask for people to tip you for using a free accelerator service or to ask about accelerating transactions. Use a thread if you have a problem with that. All posts asking for help and offering the same accelerator service will be deleted.
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