Deposit transaction pending in mempool and CPFP - Revision history

SuddenWhipVapor: /* Fee-bumping a DPT */

2023-12-26T21:39:45Z

Fee-bumping a DPT

SuddenWhipVapor at 21:39, 26 December 2023

2023-12-26T21:39:14Z

SuddenWhipVapor at 21:06, 23 November 2023

2023-11-23T21:06:26Z

SuddenWhipVapor: SuddenWhipVapor moved page Deposit tx stuck in mempool and CPFP to Deposit transaction pending in mempool and CPFP: better format

2023-09-28T09:33:32Z

SuddenWhipVapor moved page Deposit tx stuck in mempool and CPFP to Deposit transaction pending in mempool and CPFP: better format

SuddenWhipVapor at 09:29, 28 September 2023

2023-09-28T09:29:09Z

SuddenWhipVapor: /* Final considerations */

2023-09-28T09:28:55Z

Final considerations

SuddenWhipVapor: /* What can be done to speed things up */

2023-09-28T09:27:38Z

What can be done to speed things up

SuddenWhipVapor: /* What can be done to speed things up */

2023-09-28T09:25:11Z

What can be done to speed things up

SuddenWhipVapor: /* What happens when fee is too low */

2023-09-28T09:24:19Z

What happens when fee is too low

SuddenWhipVapor: /* Basic fee considerations */

2023-09-28T09:23:00Z

Basic fee considerations

← Older revision		Revision as of 21:39, 26 December 2023
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	= Fee-bumping a DPT =		= Fee-bumping a DPT =

−	Same considerations apply to delayed payout transactions needed to start [[arbitration]], but in this case it ~~will~~ always be possible to [[Delayed_payout_transaction_pending_in_mempool_and_CPFP\|CPFP a DPT]].	+	Same considerations apply to delayed payout transactions needed to start [[arbitration]], but in this case it is always possible to [[Delayed_payout_transaction_pending_in_mempool_and_CPFP\|CPFP a DPT]].

← Older revision		Revision as of 21:39, 26 December 2023
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	[https://mempool.space mempool.space] has now the option to accelerate transactions that are in mempool: open the transaction detail page, and right next to the ETA field you will find an ''Accelerate'' button that will give you access to a paid service which will increase the fee of the transaction by paying miners off-band.		[https://mempool.space mempool.space] has now the option to accelerate transactions that are in mempool: open the transaction detail page, and right next to the ETA field you will find an ''Accelerate'' button that will give you access to a paid service which will increase the fee of the transaction by paying miners off-band.
		+
		+	= Fee-bumping a DPT =
		+
		+	Same considerations apply to delayed payout transactions needed to start [[arbitration]], but in this case it will always be possible to [[Delayed_payout_transaction_pending_in_mempool_and_CPFP\|CPFP a DPT]].

← Older revision		Revision as of 21:06, 23 November 2023
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	If you find yourself in one of the scenarios where you can apply the aforementioned strategy, remember you are responsible for your own funds, and expected to know what you are doing. It is unlikely to actually lose funds unless you send the UTXO to a wrong address, but you could waste the mining fees if you didn't choose a high enough fee for the CPFP, as then you would need to either RBF the CPFP (not covered in this article), or do an additional CPFP at a much higher cost.		If you find yourself in one of the scenarios where you can apply the aforementioned strategy, remember you are responsible for your own funds, and expected to know what you are doing. It is unlikely to actually lose funds unless you send the UTXO to a wrong address, but you could waste the mining fees if you didn't choose a high enough fee for the CPFP, as then you would need to either RBF the CPFP (not covered in this article), or do an additional CPFP at a much higher cost.
		+
		+	= External acceleration services =
		+
		+	[https://mempool.space mempool.space] has now the option to accelerate transactions that are in mempool: open the transaction detail page, and right next to the ETA field you will find an ''Accelerate'' button that will give you access to a paid service which will increase the fee of the transaction by paying miners off-band.

← Older revision		Revision as of 09:29, 28 September 2023
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−	~~=WORK IN PROGRESS=~~
−
	The following article is directed at users who have at least intermediate knowledge of Bitcoin, and the suggested technique is not officially supported, meaning that if you lose funds because of mistakes, you are the only accountable party.		The following article is directed at users who have at least intermediate knowledge of Bitcoin, and the suggested technique is not officially supported, meaning that if you lose funds because of mistakes, you are the only accountable party.

← Older revision		Revision as of 09:28, 28 September 2023
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	= Final considerations =		= Final considerations =

−	If you find yourself in one of the scenarios where you can apply the aforementioned strategy, remember you are responsible for your own funds, and expected to know what you are doing. It is unlikely to actually lose funds unless you send the UTXO to a wrong address, but you could waste the mining fees if you didn't choose a high enough fee for the CPFP, as then you would need to either RBF the CPFP (not covered in ~~here~~), or do an additional CPFP ~~with~~ much higher ~~costs~~.	+	If you find yourself in one of the scenarios where you can apply the aforementioned strategy, remember you are responsible for your own funds, and expected to know what you are doing. It is unlikely to actually lose funds unless you send the UTXO to a wrong address, but you could waste the mining fees if you didn't choose a high enough fee for the CPFP, as then you would need to either RBF the CPFP (not covered in this article), or do an additional CPFP at a much higher cost.

← Older revision	Revision as of 09:33, 28 September 2023
(No difference)

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 The trader who needs to do this is the one who used a low fee in the external wallet while funding Bisq.
-When the CPFP transaction is published, you will notice that the effective fee rate of the deposit tx is increased, and if you chose a high enough fee for the child transaction, it should be confirmed in the next few blocks.
+When the CPFP transaction is published, you will notice that the effective fee rate of the deposit tx was increased, and if you chose a high enough fee for the child transaction, it should be confirmed in the next few blocks.
 = Inapplicable cases =

@@ Line 21: / Line 21: @@
 = What can be done to speed things up =
-A common strategy to accelerate a Bitcoin transaction is called Child Pays For Parent (CPFP), and consists of spending one of the outputs (child) of an unconfirmed transaction (parent) at a high fee, so those miners who want to collect said high fee, will necessarily have to confirm both child and parent transactions (and that's why child pays for parent).
+A common strategy to accelerate a Bitcoin transaction is called Child Pays For Parent (CPFP), and consists of spending one of the outputs (child) of an unconfirmed transaction (parent) at a high fee, so those miners who want to collect said high fee, will necessarily have to confirm both child and parent transactions in the same block (and that's why child pays for parent).
 Calculating the fee you need to pay for the child, so the parent fee is bumped to the desired value, requires knowing the total size of all involved transactions, and absolute fees that are already on the table, but for practicality, let us say that if you want to double the effective fee rate of the parent, you need to use a fee that is 3 to 4 times more than the parent's original fee, and increasing this even more will further speed up the confirmation.

@@ Line 17: / Line 17: @@
 Bitcoin transactions can either be confirmed, or not, so the deposit transaction will be pending in mempool until one of two outcomes occurs:
 * it is finally included in a block (trade will start normally, even with a large delay)
-* it will be purged out of mempool (no solid expiration time on this, but if it happens both traders will need to do an [[Resyncing SPV file|SPV resync]] to let Bisq acknowledge the deposit tx never took place)
+* it will be purged out of mempool by all nodes on the network (no solid expiration time on this, but if it happens both traders will need to do an [[Resyncing SPV file|SPV resync]] to let Bisq acknowledge the deposit tx never took place)
 = What can be done to speed things up =

@@ Line 8: / Line 8: @@
 A trade on Bisq can only start after the deposit transaction has been mined into a block (one confirmation is enough), so the application will choose the optimal miner fee based on how mempool is busy at the moment the taker accepts the maker's offer. There are two different edge cases which Bisq is not able to account for, and that will delay the first confirmation, if not prevent it entirely from happening:
-* sudden spikes of transactions in mempool (think when central exchanges decide to flood the blockchain with consolidation txs, or a new hype like inscriptions takes off)
+* sudden spikes of transactions in mempool (think about a bull run, or central exchanges flooding the blockchain with consolidation txs, or a new hype like inscriptions)
 * traders funding Bisq wallet at a fee which is too low to be confirmed in current mempool, and then using the unconfirmed utxo to fund the deposit tx (this will cause a Child Pays For Parent -more on this below- on the original funding tx and possible unconfirmed precursors, that will decrease the effective fee rate of the actual deposit transaction)