I deposited 0.042105059 BTC from my bitcoin account (1KDcKTBTLWnLUED6yMA4Huj5CfzgKfuvJF) to Livecoin.net account. (1DaHJ3ewQ3XBDxTLFQ4U9E9C4z8w9uEvGW) about 5 days ago but it is still unconfirmed in blockcain. The transaction has 0/3 confirmations in blockchain and still pending. https://blockchain.info/tx/4e19db9b29df ... 756396858c I learned that it because of lower fee. How can cancel or double my coins. Could any miner here push my transaction for me.

  • Which wallet are you using? The bitcoin-core wallet has a couple of options to either zap mempool transactions or increase the fee on an existing transaction.
    – sipsorcery
    Nov 14, 2017 at 20:08
  • Bitcoin wallet from blockchain
    – nanapee
    Nov 14, 2017 at 20:18
  • How can i increase the fee on the existing transaction?
    – nanapee
    Nov 14, 2017 at 20:21
  • I'm not familiar with that wallet. On the Bitcoin core wallet you can right click a transaction and choose "Increase transaction fee". To do that the transaction must have had the "Replace by fee" checkbox ticked when it was created.
    – sipsorcery
    Nov 14, 2017 at 20:28
  • You mean you are familiar with Blockchain.info bitcoin wallet. please help me with how to double spend my bitcoin in blockchain.
    – nanapee
    Nov 14, 2017 at 20:34

1 Answer 1


1. You could try child-pays-for-parent.

Your unconfirmed transaction with the txid 4e19db9b29dffd508073dd5d67ad8096559e28ef92da0eeb28fe85756396858c has two ouputs. I guess 1CfSS3Q6UxCinGg82gzwm1M6LfaxUFUJh8 (value 0.05739491) is your change output... You can use that change output as an input for a new transaction where you pay a high fee. Miners will then be interested to mine that new transaction but they can only if they also mine the old one (txid above).

You may use 2x the recommended

2. Double-Spend (harder)

  • Use -zapwallettxes=1 as Bitcoin Core startup argument.
  • Use CoinControl (enable it via Bitcoin-Qt settings)
  • Select your "blocked" input (1KDcKTBTLWnLUED6yMA4Huj5CfzgKfuvJF from 7aa1366669c3c836d7bf7abbc9b934af62bf669a250b66ccd2d72197aeafee35 0.0995BTC) in CoinControl and do a new transaction
  • Please show me steps to go about the child-pays-for parent.I try the this process how to execute the double-spend operation that @FlyButterfly described: bitzuma.com/posts/how-to-clear- ... ansaction/ but the last process says "64: scriptsig-not-pushonly". what does it mean?
    – nanapee
    Nov 16, 2017 at 13:10
  • 1
    zapwallettxes has been removed Mar 1, 2021 at 8:14

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