{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"How does blockchain prevent the occurrence of double-spending?","a":"Blockchain prevents double-spending issues by introducing techniques such as timestamps, UTXO model, and consensus mechanisms. Firstly, during the transaction process, the blockchain system checks whether the transaction exists in the unspent transaction list (UTXO) to ensure that a transaction is not duplicated. Secondly, nodes in the blockchain network selectively record transactions based on timestamps and transaction orders, making subsequent transactions dependent on previous ones. Additionally, consensus mechanisms (such as proof  of work) require participants in the blockchain network to solve complex mathematical problems before creating new blocks, ensuring the security and tamper-proof nature of the blockchain. In conclusion,"}]}],"pr":"b65778643791f878aeccbf4d646a9590c94d0b70a954bbaed10954de31336bcd"}