Bitcoin Forum

Dear all,

i tried to insert a transaction on 18 december on 23:00, but i failed with the transaction fees (put a 0 to much) giving 0.00001 fee for a 0.005 payment:

see here the TX:
https://blockchain.info/tx/fed906eff009ea743a9ba7d5f76a23b9b6803ed3bedc17589394bd392c1fdfb6

i used blockchain web access to insert the transaction and what is strange is that it seems it has been re-broadcasted on 2015-12-21 00:49:34 but i didn't accessed my wallet from last saturday 19/12 ...

Support can't give any help rather than "google for how to double spend ..."

thank you in advance
nimatek

I think what they meant by this was to go ahead and send out a transaction identical to the first one but with the proper fees this time.  Once the second transaction, the one with proper fees, is accepted the first transaction will get dropped as the double spend.

I tried using blockchain.info from web access, but if i insert the transaction once again it says insufficient funds and i can't proceed that way.

The problem is with your fees, default client with default settings only relay transactions with at least 0.00005BTC/kb fees.

Anyone with your raw TX(easily obtainable) can rebroadcast your transaction. Your receiver might be doing so. It would probably confirm eventually but it needs some time. If you really really really really need the Bitcoins ASAP, you can try doing a FSSRBF(First Seen Safe Replace By Fee) double spend.

This method basically allows the miner to assume that the first transaction it sees is legitimate. Hence, there's a few requirements:
1. The address of the outputs needs to be the same as the first transaction.
2. The value of the outputs must be equal to or more than the first transaction.outputs

If yes, you can export your private keys by going to import/export and export your unencrypted private key.
1. Go to coinb.in/#newTransaction to craft another transaction that fulfills the requirement. Since you need another input, make sure to increase the change and make the fees 0.0002BTC. Copy the unsigned text.
2. Go to https://coinb.in/#sign, paste in your private key and the unsigned raw TX in the respective fields.
3. Go to https://localbitcoinschain.com/tx/send and paste your signed raw TX to broadcast it.*

*Note: Not all nodes accept double spend TXes. You need to try those services here: https://en.bitcoin.it/wiki/Transaction_broadcasting. F2pool would definitely work but you need a referral code from the owner.

We have manually confirmed your tx in block 389591. Please consider paying more fee next time. Thanks.

I see it got 39 confirmation now, but saying the truth the fees are near 0 cent. This is awesome work from macbook-air