Bitcoin Double Spender

Bitcoin Double Spender

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Malicious Fee

Malicious Fee

Normal Fee

Normal Fee

Note that double spending has a high likelyhood of failure, and the initial transaction may be confirmed. Help

Private Key

Address:

Send to Address

Change Address

Amount

0.00 Available

Malicious Transaction (broadcast first)

Double Spend Transaction (broadcast after goal achieved)

You must broadcast thing transaction before the malicious transaction is confirmed

Use at your own risk; only with addresses contain small balances that you are willing to lose. Suggest that you decode and check the transactions before broadcasting them.

Largely based on open source javascript provided by Coinb.in | Data sourced from Blockr.io | UI based on Bootstrap

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Double Spend Help

This tool allows you to generate two transactions using the same Bitcoins.

The first transaction will have a very low fee, and will only be accepted by a few nodes, but after some time it should make its way to the recipient.

The second transaction will have a generous fee and will be broadcast more easily to many nodes.

Publish the first transaction and wait for the recipient to receive the unconfirmed transaction. You can then broadcast the second transaction and it should reach miners first as long as the first transaction has not yet been confirmed.