Instant Transaction Fraud: An Explanation

Instant Transaction Fraud: An Explanation

A few hours ago, a poster on the Bitcointalk forum announced that he was able to successfully reverse an unconfirmed transaction against the popular Bitcoin gambling site SatoshiDice. The attacker's strategy was simple. First, he sent a 0.25 BTC bet against SatoshiDice with no transaction fees, which he lost. Immediately after receiving the notification....


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