Race Attack

In a sentence

The attacker broadcast two conflicting transactions in a race attack.

• The attacker broadcast two conflicting transactions in a race attack.
• A merchant that accepts an unconfirmed payment is more exposed to a race attack.
• The attacker hoped the network would confirm the transaction returning funds to his own wallet.
• Waiting for block confirmations reduces the risk posed by race attacks.
• The payment processor delayed delivery while checking for conflicting transactions.