New transaction accelerator on the market - mempool.space

[xixou]

-snip-

Thanks for your help but this is too complicated for me.

I use bitcoin core QT.

You can also (temporarily) set mempoolfullrbf=1 option to let your node accept replacement to transactions without opt-in rbf flag.
Sign the transaction LoyceV provided you (output checks out), then broadcast it to your node's mempool.

Follow these simple steps:

• Go to "Settings->Options...", click "Open Configuration File" and your 'bitcoin.conf' file should open with your text editor.
• In your config file, type: mempoolfullrbf=1 in a new line and save the changes, then close the text editor.
• Close Bitcoin Core, wait for it to properly close, then launch it again.
• Once running, Open Core's console in "Window->Console", make sure that the correct wallet is selected in the console's drop-down menu;
  In that console window, type the command: signrawtransactionwithwallet "unsigned_raw_transaction" to sign the (unsigned_raw_transaction) LoyceV's transaction above.
• Copy the resulting signed raw transaction hex and use the command: sendrawtransaction "signed_raw_transaction" to broadcast it to your node and relay it to your peers.

Once done, you may disable the 'fullrbf' setting if you do not want to use it.

Ok I used
# Accept transaction replace-by-fee without requiring replaceability
# signaling (default: 0)
mempoolfullrbf=1

close the tool and opened again, wen't in console, but got this error:

signrawtransactionwithwallet "42888c7b1540f8d5b9e074d15c2d86d7b03878adf6f173c7316f09910c2dabd9"

TX decode failed. Make sure the tx has at least one input. (code -22)

I selected the good wallet

[LoyceV]

signrawtransactionwithwallet "42888c7b1540f8d5b9e074d15c2d86d7b03878adf6f173c7316f09910c2dabd9"

That's the txid (transaction ID). You should use the raw transaction:

Code:

 signrawtransactionwithwallet "01000000010481a776ff31478b8b967e15a9e68f78f4cd06b156a5d12910f72d8885147e95020000001976a914367ca154148ceabbcfc3b6c6167f512bb4f9c23388acfdffffff01b88800000000000017a914e09aa133479cff513578a460c606ba504fd761a68700000000"

[xixou]

signrawtransactionwithwallet "42888c7b1540f8d5b9e074d15c2d86d7b03878adf6f173c7316f09910c2dabd9"

That's the txid (transaction ID). You should use the raw transaction:

Code:

 signrawtransactionwithwallet "01000000010481a776ff31478b8b967e15a9e68f78f4cd06b156a5d12910f72d8885147e95020000001976a914367ca154148ceabbcfc3b6c6167f512bb4f9c23388acfdffffff01b88800000000000017a914e09aa133479cff513578a460c606ba504fd761a68700000000"

Error: Please enter the wallet passphrase with walletpassphrase first.

ok I had to use walletpassphrase and the timeout value, it still ask it though.
It does not seems to pick both command in one line, what to do now?

[LoyceV]

It does not seems to pick both command in one line, what to do now?

First use the wallet passphrase with a timeout (say 600 seconds), then sign the transaction (on the next line).

[xixou]

It does not seems to pick both command in one line, what to do now?

First use the wallet passphrase with a timeout (say 600 seconds), then sign the transaction (on the next line).

ok, completed:
b30c00",
  "complete": true
}


ok so next step:
Copy the resulting signed raw transaction hex and use the command: sendrawtransaction "signed_raw_transaction" to broadcast it to your node and relay it to your peers.

ok done, what's next?

[LoyceV]

Copy the resulting signed raw transaction hex and use the command: sendrawtransaction "signed_raw_transaction" to broadcast it to your node and relay it to your peers.

ok done, what's next?

It's not showing up on mempool.space yet, so the broadcast didn't work. Try to broadcast the signed transaction through coinb.in.

[xixou]

Copy the resulting signed raw transaction hex and use the command: sendrawtransaction "signed_raw_transaction" to broadcast it to your node and relay it to your peers.

ok done, what's next?

It's not showing up on mempool.space yet, so the broadcast didn't work. Try to broadcast the signed transaction through coinb.in.

Could you help me as well how to enter the data on coinb.in?

Thank you for your help so far.

[nc50lc]

ok done, what's next?

What's the result when you used sendrawtransaction command?
If it's success (txid) but not propagating, your peers may still have your old transaction and don't support "fullrbf" so they're rejecting it.
One solution is to use addnode command to connect to peers that is known to support fullrbf
like the ones listed here: petertodd.org/2023/why-you-should-run-mempoolfullrbf#full-rbf-peering

Another simple solution is to broadcast it to nodes that support it.
AFAIK, Blockstream supports fullrbf so try to broadcast the signed raw transaction there: blockstream.info/tx/push

You may also share the signed raw transaction so others can try to broadcast it to their node. (there's no difference in privacy since your original transaction is already known)
Use [code][/code] tags to preserve its formatting.

[xixou]

ok done, what's next?

What's the result when you used sendrawtransaction command?
If it's success (txid) but not propagating, your peers may still have your old transaction and don't support "fullrbf" so they're rejecting it.
One solution is to use addnode command to connect to peers that is known to support fullrbf
like the ones listed here: petertodd.org/2023/why-you-should-run-mempoolfullrbf#full-rbf-peering

Another simple solution is to broadcast it to nodes that support it.
AFAIK, Blockstream supports fullrbf so try to broadcast the signed raw transaction there: blockstream.info/tx/push

You may also share the signed raw transaction so others can try to broadcast it to their node. (there's no difference in privacy since your original transaction is already known)
Use [code][/code] tags to preserve its formatting.

ok I got this after putting the signed:

https://blockstream.info/tx/42888c7b1540f8d5b9e074d15c2d86d7b03878adf6f173c7316f09910c2dabd9

[LoyceV]

ok I got this after putting the signed:

That's the same transaction you posted in March. You didn't sign and broadcast a new one.

[nc50lc]

-snip-

ok I got this after putting the signed:

It should be the new signed raw transaction, the result of the signrawtransactionwithwallet command in your previous "ok, completed" reply.

If you haven't kept a copy of it: within 2 minutes after using; walletpassphrase "your_passphrase" 120
Use:

That's the txid (transaction ID). You should use the raw transaction:

Code:

 signrawtransactionwithwallet "01000000010481a776ff31478b8b967e15a9e68f78f4cd06b156a5d12910f72d8885147e95020000001976a914367ca154148ceabbcfc3b6c6167f512bb4f9c23388acfdffffff01b88800000000000017a914e09aa133479cff513578a460c606ba504fd761a68700000000"

Take note that LoyceV put the same output in that smaller transaction that could "replace" your old unconfirmed 1sat/vB transaction
Use that exact command in the code if you're still willing to send a smaller amount of 35,000sat to 3NAcXNafRsDDNqfzxMmd7qARswfob1e1xL.
If everything's fine, broadcast the result.

BTW, we've been derailing this topic about mempool.space's accelerator.
It's best to start a new topic in 'Bitcoin Technical Support' board where this fits and for better visibility.

[Pmalek]

Mempool Space now allows anyone to pay for and accelerate any transaction they want. You don't need to register an account and get whitelisted. There are a few customization options. From what I can see right now, there are three options where you can pay between 51k and 60k sats. When you choose how much you want to pay, you will see a QR code with an LN invoice. Of course, RBF and CPFP remain the better options than paying Mempool space for the acceleration.   

[LoyceV]

Mempool Space now allows anyone to pay for and accelerate any transaction they want. You don't need to register an account and get whitelisted. There are a few customization options. From what I can see right now, there are three options where you can pay between 51k and 60k sats. When you choose how much you want to pay, you will see a QR code with an LN invoice. Of course, RBF and CPFP remain the better options than paying Mempool space for the acceleration.

So that's why they never got back to confirming my account. It's a good service, but right now it looks a bit misleading:

Reducing expected confirmation time to within ~9 minutes
~
Your transaction will be prioritized by up to 39.0% of miners.

The first statement is incompatible with the second statement.

I like that they're promoting LN instead of shitcoins for this.

[Pmalek]

It's a good service, but right now it looks a bit misleading:

Reducing expected confirmation time to within ~9 minutes
~
Your transaction will be prioritized by up to 39.0% of miners.

The first statement is incompatible with the second statement.

Yeah, they make it sound like it's very likely that your transaction will get into the next block but at the same time only about 4/10 miners would prioritize it and include it in their block. It doesn't sound right. Not to mention how the fees you pay don't affect when the next block will be found. Regardless of if you pay 1 or 1000 sat/vByte, you might still have to wait 40 mins for a new block to be mined.

I like that they're promoting LN instead of shitcoins for this.

LN makes the most sense for this. It's good that they don't request regular L1 BTC to make you wait for two transactions to confirm on-chain.

[SFR10]

From what I can see right now, there are three options where you can pay between 51k and 60k sats.

This applies to most transactions, but it's worth noting that apart from their standard fee of 50k sats ^{[roughly $30]} + extra fee based on the chosen target rate, they're also charging another 50k sats for larger transactions ^[screenshot].

It's a good service, but right now it looks a bit misleading:

Reducing expected confirmation time to within ~9 minutes
~
Your transaction will be prioritized by up to 39.0% of miners.

The first statement is incompatible with the second statement.

Yeah, they make it sound like it's very likely that your transaction will get into the next block but at the same time only about 4/10 miners would prioritize it and include it in their block.

I agree with both of you, but I expect that percentage will rise soon ^{[IIRC, their only partner used to be Foundry USA in the beginning, but they've managed to also partner with three more (MARA Pool, Spider Pool and SBI Crypto)]}.
^{- Looks like the next one is going to be "Ocean".}

[Pmalek]

Mempool Space has released some more information about their transaction acceleration feature. Besides paying over the Lightning Network, users can also pay with Google and Apple Pay and Cash App (depending on regions). Mempool Space has also released the names of their mining pool partners. Accelerated transactions will be pushed to Foundry, Mara, SBI Crypto, SpiderPool, and Ocean.

https://x.com/mempool/status/1817228273656500230

[xixou]

Interesting, after 5 months, I received an email from mempool telling I have access to their accelererator.
I was able to pay (google pay) their accelerator and finally got my transaction validated within 30 minutes.
Big lesson learned on this one.

[nc50lc]

Interesting, after 5 months, I received an email from mempool telling I have access to their accelererator.

Me, I've registered since November 29, 2023 and I just received the same email 3 days ago.
Seems like those who got early access are donators (or those who have contact) and everyone else are granted access only after when they officially released the service.

On a side note, you could've cut cost on the accelerator's payment if you managed to replace the transaction using the given instructions above.

[ABCbits]

Mempool Space has released some more information about their transaction acceleration feature. Besides paying over the Lightning Network, users can also pay with Google and Apple Pay and Cash App (depending on regions). Mempool Space has also released the names of their mining pool partners. Accelerated transactions will be pushed to Foundry, Mara, SBI Crypto, SpiderPool, and Ocean.

https://x.com/mempool/status/1817228273656500230

It's somewhat surprising they cooperate with Ocean, when that pool have low hashrate and only mined 6 blocks last month[1]. Although in terms of business, it's a shame they released it when average fee rate is currently below 5 sat/vB.

[1] https://ocean.xyz/dashboard

[Pmalek]

I was able to pay (google pay) their accelerator and finally got my transaction validated within 30 minutes.
Big lesson learned on this one.

Always have RBF enabled or use software that support RBF by default. If, for some reason, you are forced to send a transaction to some service without the RBF on, then make sure you pay a high enough fee to have the transaction confirm in a reasonable timeframe. If you don't want to check on the fees manually, use Mempool.Space's medium or high priority recommendations. It's too late now, but you paid for the acceleration much more than what you would have if you had followed the instructions that nc50lc and LoyceV provided.