Blockchain.info BS. Double spend. Please help.

[albert_mt]

I have a Blockchain.info account. I wanted to send 1.1489 BTC to a friend. I clicked on the send button in my Blockchain.info wallet, I paid 0.0001 mining fee. After 8.5 hours I have this message:

"Warning! this transaction is a double spend. You should be extremely careful when trusting any transactions to/from this sender."

Wtf? How can I double spend when I am sending from my blockchain info account?

The recipient never received the money, but 1.1489 BTC deducted from my Blockchain.info account balance. I am an average user, all I did clicked on the send button to send this 1.1489 BTC to a friend. This is BS. What on the earth I could do wrong that I have this double spend message? I sent the money from my  Blockchain.info wallet.

Could you help figure out what happened and how to fix this please? 1.1489 BTC is a big money for me to loose for nothing.

The transaction hash is

c5790eef1a8fc78a6eb80e96657ccca38f668cd6d2ebe3887ce452af121116d6

and I wanted to send to address

14ykGrJvaYNY9EQ5b1YLFsjwzYV6aFkpcZ

this my friend's BTC address where I waned to send the money.

Maybe this is why people don't want to use Bitcoin because such things happens, never mind the many scams on the exchanges.

[johoe]

Some of the inputs of your transactions are unconfirmed, that means the transactions paying you are not yet mined and there is also a double spent warning for them.  Also their inputs are still unconfirmed.  It may be a double spend somewhere along the chain.

I guess this is partly due to the ongoing stress test; the blocks are full and transactions are confirmed slowly.  Before the transactions that pay you are confirmed your transaction cannot be confirmed.  It may even be that the transaction paying you is never confirmed, in which case you have to make sure you get paid again and send a new transaction.

Update:  Looking closer, it seems that you have run the coins through a mixer.  One of the persons who mixed with you double spent their transaction:

https://blockchain.info/tx/ee7a8a57edb82d7941945f9f27a4c5f72c1d3b41a686c9b9d6341c1e5e2547ca

You have to wait until blockchain.info sorts out this mess and removes the unconfirmable transactions from its database.

[albert_mt]

Some of the inputs of your transactions are unconfirmed, that means the transactions paying you are not yet mined and there is also a double spent warning for them.  Also their inputs are still unconfirmed.  It may be a double spend somewhere along the chain.

I guess this is partly due to the ongoing stress test; the blocks are full and transactions are confirmed slowly.  Before the transactions that pay you are confirmed your transaction cannot be confirmed.  It may even be that the transaction paying you is never confirmed, in which case you have to make sure you get paid again and send a new transaction.

Update:  Looking closer, it seems that you have run the coins through a mixer.  One of the persons who mixed with you double spent their transaction:

https://blockchain.info/de/tx/ee7a8a57edb82d7941945f9f27a4c5f72c1d3b41a686c9b9d6341c1e5e2547ca

You have to wait until blockchain.info sorts out this mess and removes the unconfirmable transactions from its database.

thank you so much for helping out. I think that's what happened what you said. i clicked on the shared service without understanding the risks of that service. That is the mixing service of blockchain.info and it just didn't work. right now my money is gone and there is a double spending message.

at least Bitcoin works and Bitcoin is OK, the problem like always not with bitcoin but with the company who is milking money from bitcoin. this is good lesson fore everyone. Don't use the blockchain.info shared service, it is useless.

for the fairness, I will report here whether Blockchain.info has sorted out this problem or not. I contacted their customer service and asked to help me out, so far they haven't even answered.

[everaja]

Double spend are very rare as posted by " johoe" he told you that Mixer probably was the main cause behind the double spend.
sorry for your loss all i can give you is a suggestion on how to bypass this double spend , always use xapo wallets for receiving your Mixed coins and then transfer the coins from Xapo wallets to your Daily use Wallet like Blockchain ,  i am sure you wont experience double spend next time !!

[albert_mt]

Double spend are very rare as posted by " johoe" he told you that Mixer probably was the main cause behind the double spend.
sorry for your loss all i can give you is a suggestion on how to bypass this double spend , always use xapo wallets for receiving your Mixed coins and then transfer the coins from Xapo wallets to your Daily use Wallet like Blockchain ,  i am sure you wont experience double spend next time !!

thanks for the advice and helping out with this.

what a mess!!! sending 1.2 BTC using a company which raised 30 million dollar investment to provide a service, which service doesn't work. and average users like myself trust these BS third party services blockchain.info, xapo and the rest.

are you saying the money is gone and blockchain.info, the service provider won't be able to recover it?

[favdesu]

are you saying the money is gone and blockchain.info, the service provider won't be able to recover it?

no, you have to wait until the chain runs some cleanup. your service provider won't be able to do anything, what mixer did you use?

[johoe]

are you saying the money is gone and blockchain.info, the service provider won't be able to recover it?

It depends on what happened and how the mixing service is implemented.  Possibilities and outcomes:

• All mixing transactions are reverted and you can simply spend your original unmixed coins again,
• Some mixing transactions were confirmed; part or all of the money is sitting in the mixer address.  Then there are three possibilities
  
  • The private keys for the mixer addresses were added to your wallet.  Then you are still able to spend the money.
  • The private keys are stored at the service provider.  Then the service provider can recover the money that is stuck and send it back.
  • The private keys were never stored at all  .  Then the money is lost and you can only hope that you get reimbursed.

I hope it is not the last one.  This would be a bad implementation of the mixer as this incident demonstrates. 

[albert_mt]

are you saying the money is gone and blockchain.info, the service provider won't be able to recover it?

It depends on what happened and how the mixing service is implemented.  Possibilities and outcomes:

• All mixing transactions are reverted and you can simply spend your original unmixed coins again,
• Some mixing transactions were confirmed; part or all of the money is sitting in the mixer address.  Then there are three possibilities
  
  • The private keys for the mixer addresses were added to your wallet.  Then you are still able to spend the money.
  • The private keys are stored at the service provider.  Then the service provider can recover the money that is stuck and send it back.
  • The private keys were never stored at all  .  Then the money is lost and you can only hope that you get reimbursed.

I hope it is not the last one.  This would be a bad implementation of the mixer as this incident demonstrates. 

the whole transaction amount is returned to me by blockchain.info so fortunately it was not the last option. Thank you very much for helping out in this stressful situation   

since blockchain.ino acted upon reporting the problem and resolved it in satisfactory manner, I have to say that their service is not a BS, I am sorry for saying that blockchain.info's service is useless.

still, i will stay away from such services because if the case is the option 3 and private keys were never stored than the money will be gone.

[Vaccomondus]

Some of the inputs of your transactions are unconfirmed, that means the transactions paying you are not yet mined and there is also a double spent warning for them.  Also their inputs are still unconfirmed.  It may be a double spend somewhere along the chain.

I guess this is partly due to the ongoing stress test; the blocks are full and transactions are confirmed slowly.  Before the transactions that pay you are confirmed your transaction cannot be confirmed.  It may even be that the transaction paying you is never confirmed, in which case you have to make sure you get paid again and send a new transaction.

Update:  Looking closer, it seems that you have run the coins through a mixer.  One of the persons who mixed with you double spent their transaction:

https://blockchain.info/de/tx/ee7a8a57edb82d7941945f9f27a4c5f72c1d3b41a686c9b9d6341c1e5e2547ca

You have to wait until blockchain.info sorts out this mess and removes the unconfirmable transactions from its database.

hey nice analysis, how did you found all those info only with the tx? especially that the coin are mixed, i want to know please

[johoe]

hey nice analysis, how did you found all those info only with the tx? especially that the coin are mixed, i want to know please

Since the unconfirmed and double-spend transactions are removed by now, it is no longer possible to see this.   I opened the transaction in Blockchain.info.  If advanced mode is enabled it showed me the unconfirmed input with a small red U.  I clicked on the corresponding links to get to the parent transaction.

The parent transaction was a transaction with many inputs and many outputs.  It's parent transactions had a similar shape.  The coin values were more or less random.  The transaction was originally sent by Blockchain (usually the origin IP is not accurate at all but if it says they sent it, it should be accurate).  All these point very clearly showed that it used the Blockchain.info mixing service.  Here is an example for how such a transaction looks like: edd0626aab907e4eb41cd132f457ebc0411458f0532b5233681692b03c2e81d9

I followed the chain of unconfirmed inputs simply by clicking on the input with the U.  Until I got to a transaction, where all inputs were confirmed.  This was the transaction that was double-spent by the transaction I posted.  Again Blockchain.info provided the link to this transaction and this is what I posted.

IIRC, the double-spend was sent about 20 minutes after the initial mixing transaction and it has a much higher fee  (0.01 instead of 0.0005).

[kaykawa]

If you are using any wallet other than Bitcoin Core 0.10.x or 0.9.5, then you should not trust incoming transactions until they have ~30 confirmations