{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"What is the double-spending attack in a blockchain network?","a":"The Double-Spending Attack in blockchain networks is an attack that exploits the consensus mechanism of the blockchain network to conduct two payments with the same digital currency. The attacker creates a fork in the blockchain network, sends a transaction to different branches in turn, and waits for the transactions to be confirmed. Once the branch controlled by the attacker exceeds the original branch in length, they can cancel the original transaction and achieve double spending. This attack threatens the security and credibility of blockchain networks, so the blockchain community has been seeking effective defense measures."}]}]}