What is a bitcoin double-spend transaction?

A bitcoin double-spend transaction is a bitcoin transaction which attempts to spend inputs (funds) which have already been spent in another transaction on the Bitcoin network.

A double-spend can be created accidentally by a user's wallet or engineered by an attacker. 

The Bitcoin network will only confirm one of the two transactions using the same imputs (the first), so all attempted double-spends are removed from the network rather than confirmed. 

Once the network has confirmed a transaction (6 confirmations), the transaction can be considered valid and irreversible. 

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