No problem... I just noticed that 3f9d89be1024c292c0cc832a41b25b458e834fe9037d7d3b758c54628eb380be is opt-in rbf... This is great . You can use electrum to bump the fee... Just right click on the pending transaction and chose "increase fee" .Don't enable the checkbox "finalise"!

The second transaction is using an output from the first transaction, so if you RBF the first transaction, the second one will most likely be cancelled and will probably have to be recreated.

A big thanks to HCP for helping me get trough the many requests... Couldn't do this without a little help from time to time  

It looks like this is the only question left open at the moment:

I'll create a double spending transaction for you... The only thing i wanted to ask: could you tell me which output value i can take the extra fee from? You're funding 1Nejxrk4Y9Q2eQ6YTd3hMi46uSnnN4Ghbn and 3AbZaaKj4ZVomw4YKTTpraqQYbaesByTpJ, i'll have to reduce one of these outputs to leave room for a bigger fee... It's up to you to pick witch one.

Once you tell me where to take the fee from, i'll create an unsigned transaction, since you moved to electrum, you *should* be able to sign said transaction with your electrum wallet and broadcast it afterwards. It's been a while since i last did this, so i hope it still works, but i don't think it'll be a big problem

Well....
As much as i'd like to say you shouldn't worry, i'd be lying...
IF the sender is an honest person, chances of things ending badly are small tough, and a swift reply to a support ticket is usually a good sign.

Basically: your unconfirmed transaction (and it's unconfirmed parents) are now sitting in the mempools of many nodes. However, the default node setting is to remove unconfirmed transactions from it's mempool after 3 days. If most of the network's nodes forgot about your transaction, the network will act like it never existed in the first place... If your transaction isn't in most of the mining nodes mempools anymore, chances of it confirming will drastically reduce (eventually to 0% chance).
This isn't a complete disaster... If you save the raw transactions, you can always rebroadcast them (if the sender is an honest person or company, they might even rebroadcast unconfirmed transactions themselfs).

The bigger problem lies in the fact that as long as the unconfirmed transaction chain doesn't end up in a block, there is always a possibility the sender re-uses the unspent output he used as an input for your transaction in a transaction with a higher fee. If he agressively broadcasts this second transaction, and it ends up in a block, your transaction will be "cancelled"... It becomes invalid the second the double spending transaction ends up in a block.

But, like racquemis already said: the fee is high(ish) enough for your transaction to end up in a block sooner or later, and if the sender is an honest company, chances of things going sour are slim... I'd still save the raw transactions from the chain tough, just in case i'd need to rebroadcast them. In order to do this, look up the transactions on my site: https://www.mocacinno.com/page/getraw

In order for you to fix your first transaction (9d9123565f2900f0ea3cd4e7aa6d16736243ac4728d285bec6441e4eb67e2a22), transaction 3f9d89be1024c292c0cc832a41b25b458e834fe9037d7d3b758c54628eb380be has to be confirmed first.

Can you give a bit of background information?
Did you create these transactions? Which wallet(s) did you use to send/receive? Which addresses are yours?

There are 2 working ones with an easy enduser gui.
tx: f78d950a689f8bd6835bbf50c987505f678751d520891c09411ce6d2d903033f
size: 225 bytes
https://pushtx.btc.com/ => $72
https://pool.viabtc.com/tools/txaccelerator/ (paid service at 0.01 BTC/kb) => 0.00225 BTC (= about $40)

Viabtc IS working, but heavily abused... Chances of succesfully pushing a tx are very slim


I've never used that tool, but the author is a verified member of the community, so that should be safe, yes


sorry, but it's almost impossible to help you without knowing the basic information, as specified in the very first post in this thread. It's obvious why the tx is stuck tough: it has a 5 sat/byte fee, while the optimal fee is 720 sat/byte

I don't think those pools will browse the forum looking for people the can give a quote.
It's pretty simple:
https://pool.viabtc.com/tools/txaccelerator/ => paid service costs 0.01 BTC per kb. In your case that's 1.113 * 0.01 = 0.0113 BTC (more info via link i posted)

OR

https://pushtx.btc.com/ => their gui tells me that at this moment, they'd ask $284.66 for an acceleration

OR

you can politely ask macbook-air or quickseller via PM how much they'd charge  to push your tx to the f2pool priority queue

https://bitcoinfees.earn.com/ estimates that at this point in time, it can take up to 143 blocks to have a 95% of getting your tx confirmed... However, if more tx's with higher fees get broadcasted, things might get worse for you.

In case of an exchange to exchange (or online wallet) transaction, the only thing you can do is pay a miner to include your tx, wait it out, or contact the SENDING exchange and demand a sollution.

indeed... The only other option is to create a CPFP, a fourth transaction paying the fee of the 3 unconfirmed transactions AND the fourth transaction.
The basic idear is that a miner can only collect the fee of the fourth transaction IF he adds the 3 stuck parent transactions in the same block. In this case you'll end up paying everybody else's fee, but your transaction WILL get confirmed.

An alternative, political, idear is to put pressure on the exchange's support dept. They created this mess, let them fix it...

ViaBTC is real, they only have 100 free slots/hour tough, i no longer bother trying, chances of getting your tx pushed are astronomically small. In the OP's case, it's useless anyway, viabtc does not accept tx's with unconfirmed parents.

confirmtx: i've not seen any real evidence of this one working

That exe you linked to: no idear what it is, i don't open untrusted executables.

Since you are the receiver, there are 2 options for you:
1) contact the sender, request that he fixes his mess...
2) do a CPFP... A CPFP is basically using the unspent output from the unconfirmed transaction to generate a new transaction, this new transaction can only be included in a miner's block if he/she also includes the parent transaction. If the fee of the child is high enough to cover both the fee of the child AND the parent, some miners will actually mine both tx's and solve your problem.

If you go for option 2, i REALLY need to know your wallet software. It's not hard: which program on your pc did you use to generate an address you gave to the sender? OR, which website did you surf to to generate this address (altough, if you used an online wallet, the odds of me being able to help you are small).

first things first, a chain of unconfirmed transactions != double spending.

What you probably have read is that when your incoming transaction uses the outputs of an unconfirmed parent transaction, there is a risk the creator of the parent transaction double spends the input of the parent transaction, and every other transaction in the chain gets cancelled. This is true.
If you trust the person who is using unconfirmed unspent outputs to build new transactions, this does not HAVE to be a problem. However, it is true that your transaction can not be confirmed BEFORE all parent transactions of your transaction are confirmed (they can all be put in the same block tough, just not in an earlyer block).

there are several problems with this transaction
The biggest being that it's part of a chain of unconfirmed transactions. Your transaction can only end up in a block after all unconfirmed parents ended up in a block!

In your case, your transaction will only be confirmed AFTER:
761a296f4186acf06e7569253b89c835b0b8cb2321e0ad7d0a85893639dc65b4 and 6e517de18049302ff28544dace215dd1ac4df5dd185b69f6676c1095be97ca1b

The second problem is that altough you say your transaction has sufficient fees, it has not... https://bitcoinfees.earn.com/ recommands a fee of 730 sat/byte for a 95% chance of ending up in the next 3 blocks. Your tx AND the 2 parent tx's have a fee between 330 and 370 sat/byte... I know, in fiat terms that's a LOT of money, but it just isn't sufficient at this point in time.

That's a good idear... If you don't know anything about the parent transaction, it's indeed the problem of your ewallet, they should not use outputs of unconfirmed transactions to create new transactions.

I did wanted to point out that bitcoin is a global currency, it's not bound to boundries. In general, it's a bad idear to use online wallets, so i think you should seriously consider running a desktop wallet (electrum is my favorite). If you run your own desktop wallet, you can fix a lot of your own problems, while using an online wallet requires intervention from a central authority.

Ok, let's see... you are the sender... This means that it was your wallet software that used the output of an unconfirmed transaction to build a chain of unconfirmed transactions... That's defenatly not good.

Could you tell me if you're also the sender of the unconfirmed parent:
https://blockchain.info/tx/3a3bac0345baecda7409c09e14dc7023bbc75dc1e8ec9d13782211ce44f2aa03

There are 2 possibility's here:
1) you're also the sender of 3a3bac0345baecda7409c09e14dc7023bbc75dc1e8ec9d13782211ce44f2aa03. In this case, it's 100% up to you to solve this problem. If you want my advice, i really need to know which wallet you used.

2) you're not the sender of 3a3bac0345baecda7409c09e14dc7023bbc75dc1e8ec9d13782211ce44f2aa03, in this case, it might be a good idear to contact the sender, and ask him/her to fix his/her transaction...

You're sending from an online wallet to an online wallet... This severely limits the things you can do to speed everything up:
- since your tx had a "reasonable" fee, i submitted it to antpool, chances of this working are small
- you can keep rebroadcasting the transaction and wait it out
- you can pay for an acceleration at one of the following pools: viabtc.com, btc.com or f2pool.com

Good luck!


This one actually is part of a chain  of unconfirmed transaction... Each parent transaction in your chain has to be confirmed before your transaction will be confirmed.
I can give you some tips on what to do, but i'm still missing a lot of information i need in order to give you advice... Please read the very first post in this thread and decide wether or not you want to share this information or not.

That's pretty easy, you just submit it to one of the nodes that created a gui for this task.
As a matter of fact, Timelord2067 created a thread where he collects nodes that allow rebroadcasting transactions (it includes my node  )
https://bitcointalk.org/index.php?topic=1938621.0;topicseen

Since you used a reasonable fee of allmost 300 sat/byte, your transaction will eventually confirm if you keep rebroadcasting the raw transaction:

Since you're both the sender AND the receiver, you should be able to do a CPFP from the receiving wallet by right-clicking the stuck transaction and chosing "child pays for parent". If this menu is unavailable, it means you need to update your electrum wallet

I know i said i wouldn't push any more tx's to antpool, but since your fee is reasonable, you have a reasonable chance with antpool, so i made an exception and pushed it anyways...

A small piece of advice: go to the preferences and set your wallet to always opt-in RBF, that way your problem could have been solved cheaper and faster

It seems i have a huge backlog in writing replys... I'll be adding new replies to this post by editing it!

I wanted to extend a special thanks to both HCP and philipma1957 for helping me out, since the inflow both on the forum, in PM, my email, my twitter,... is more than i can possibly handle by myself.

During this anwering round, i won't be able to spoonfeed answers to anybody... I'll try to push you in the right direction, but you'll have to  do some of the grunt work yourself... I'm swamped with questions lately.

If, for some reason, i forgot to answer your question (check back in a couple of hours after i'm done editing), don't hesistate to re-ask

First Question
Since you are the receiver, that leaves you with a CPFP or paying a miner to confirm your transaction.
If it was a huge amount of BTC, i'd probably contact your exchange's support dept, and ask them to do a CPFP, but since the amount is relatively small, the best thing you can do right now is keep re-broadcasting the raw transaction:


Second Question

Since the receiver is an exchange, this pretty much rules out CPFP, the tx isn't opt-in RBF so that's out of the question to...
Multibit HD is no longer supported, if you move away from multibit HD to electrum (tutorial can be found here: https://multibit.org/blog/2017/07/26/multibit-shutdown.html), you SHOULD be able to follow my wizard on http://www.mocacinno.com/page/feechecker to create, sign and broadcast a transaction double spending the inputs of the unconfirmed transaction using electrum

Thirth Question


I think you *should* be able to get your hands on the private keys by using the offline sourcecode https://iancoleman.io/bip39/ and the correct derivation path. I don't really have time to look up the derivation path myself (answering tons of questions).

If you can't get it fixed, i do know btc.com, viabtc.com and f2pool accept such transactions for a big premium. the first two have a webpage selling their service, f2pool can be contacted on bitcointalk (macbook-air is the owner, and quickseller has push privileges)

Fourth Question

The problem here is that this tx is using inputs from an unconfirmed parent transaction (e0f15412adeef065b24b184ef0def8495ee78cb1bf9815f9abe21a57333ae3cf).
Your transaction can only be confirmed once it's parent is confirmed.
You could potentially do a CPFP, but you'll have to pay the fee for both your stuck transaction AND it's parent...
The total size of both tx's is 35502 bytes + 225 bytes + 225 bytes (for the CPFP tx) = 36 kb.
The optimal fee at tis point is 700 sat/byte.. So the CPFP tx should have a fee of 0.25 BTC, which is about $4300.. You basically got a bad deal here...

The other option is to contact the sender and force him to clean up his act... He used the outputs of an unconfirmed transaction as input for a new transaction, and that's not a cool thing to do!

Fifth Question


Hi Phil, sorry to see you leave the escrow business... You were one of the guys i actually looked up to. I always loved guessing the next diff jump on your threads
As for your transaction, it has a fee of almost 400 sat/byte... I'm pretty sure it'll be confirmed sooner or later, i did push it to antpool for you, since the fee is reasonable, this one *might* actually have a chance of getting into one of their blocks!

Sixth Question

I really don't know bither... If you want to know wether they rebroadcast or not, and if they do how to stop it, i would suggest reading/posting in their Ann thread: https://bitcointalk.org/index.php?topic=498382.0

doing a CPFP from electrum should be as easy as right clicking on the pending, incoming transaction in the transaction history tab. There *should* be an option "Child pays for parent", just follow their wizard and you *should* be OK... If the option isn't shown, make sure you run a recent version (i think they're up to 3.0.3 now, i don't know when this feature was introduced, but older versions might be lacking it).

If you can't get CPFP to work, and you need some extra help, i'd like you to find out if you can use your seed words to restore your bither wallet in electrum. If you can, i can walk you trough doublespending (it might also be possible with bither, i just don't know, nor have the time to really dig into it).

Thanks for the tip, it is greatly appreciated

Seventh Question


Well, the main problem is that you are using unknown (to me) independant online wallets... You're basically stuck with the feature set they provide (or with their support dept) UNLESS you can export the private keys of either wallet... Would it be possible to find out which feature sets are offered by the sending/receiving wallet, and if you can export private keys from either one?

Eight Question


Your fee is sufficient to get a confirmation sooner or later, but defenatly not high enough to have a decent chance of getting confirmed right away...
The fee for a 95% chance of getting into the next 3 blocks is 700 sat/byte at the time of writing!

Nineth Question

No problem, could you share witch wallet you used to create the transaction, and which wallet was receiving?

Tenth Question

I did this because i could... I used to be able to help about anyone who had a problem in the past.. However, nowadays, a lot of the tools i used to use are heavily abused by people cheaping out on fees. It has come to the point where i'm happy when i'm able to help just 1 or 2 people a day.

I'm not affiliated with bitcoin cash, nor with any of the pools i used to use. When i send somebody to a pool, i don't get a cut. I must admit i sometimes send people to my own site for more information, and i do get some ad revenue from that (about 0.005 BTC/year, i estimated)

that's all pretty basic stuff... it looks to me like you did not include the quotes i specified in my example?
Also, if bitcoin core is located in C:\Program Files (x86)\Bitcoin instead of C:\Program Files\Bitcoin, you'll need to adapt the example to the correct path.

I googled this link for you, it's a basic tutorial on how to use the command prompt: http://www.cs.princeton.edu/courses/archive/spr05/cos126/cmd-prompt.html

An other option would be to use windows explorer, navigate to the folder containing bitcoin-qt.exe, right click, make a shortcut, edit the shortcut and add the startup parameter in the shortcut-edit-gui

Q1: What's happening?
A1: IF you want a 95% chance of getting into the next 3 blocks, you need to pay a fee of 480 sat/byte. If your transaction is using the output of an unconfirmed parent transaction, it cannot be added to a block BEFORE the parent is added to a block either.

Let's look at your transactions
b55a68e7f9a4f336469068d9dacf4457aa0f72e2db4605dd2aedf87456d50b24 => fee of 10 sat/byte, and using an unconfirmed parent!
20f341efceae193b7eb79e6c990735a4b7659d41536c1dc187324ccf40a53ea4 => fee of 44 sat/byte
d8b5b81a6295c4ba2291549096bbd0b0c7aafa2cca833e6506f701fdf39160ca => fee of 57 sat/byte
b55a68e7f9a4f336469068d9dacf4457aa0f72e2db4605dd2aedf87456d50b24 => fee of 10 sat/byte, and using an unconfirmed parent!
c7b475c3e3284af39aebe3172a3d1d21daada8aa708c6d802310a165ab8b39d4 => fee of 677 sat/byte, but using an unconfirmed parent with a fee of 10 sat/byte!

In short, a miner choses the transactions with the highest fee/byte of transaction data to fill the blocks he's working on. The transactions you created are not appealing to him/her, the odds of these transactions ending up in a block without any intervention are very, very slim (but they do exist tough!)

Q2: what should you do?
A2: first of all, switch to a decent wallet... I have never used bither HD wallet, nor bitpie... But if they didn't even warn you about the fee, nor the fact you were using unconfirmed transaction's outputs to create new transactions, they don't sound like good wallets to me.
As for your problem with the stuck transactions, there are 4 possible sollutions:
1) waiting it out.. Just make sure bither isn't rebroadcasting your transaction and wait for a couple of days (and possibly repair or rescan your wallet)
2) use the output of the unconfirmed transaction to create a new transaction with a fee that is high enough to cover both the initial transaction and the new transaction (CPFP)
3) double spend the unspent output that was used as input for the hanging transaction
4) pay a miner to include your tx in the block he/she is currently working on. viaBTC, btc.com and f2pool are known to help people out if they pay enough (do expect to pay a big premium on top of the "best" fee)

Is the path correct?
cd to open the prompt
type

type

Post the output in a post and let me see what you got