{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"How does blockchain technology prevent the problem of double spending?","a":"Blockchain technology effectively prevents double-spending issues through decentralization, distributed ledgers, encryption algorithms, and consensus mechanisms. In a blockchain system, each node stores the complete transaction history, and the verification and confirmation of new transactions consume a large amount of computing resources. Therefore, to achieve double-spending in a blockchain system, an attacker needs to tamper with the ledgers of multiple nodes simultaneously and complete the confirmation under the condition of consuming a large amount of computing resources. This makes the cost of double-spending attacks extremely high, effectively preventing such issues from occurring. In addition, blockchain technology also adopts mechanisms such as timestamps  and transaction order to ensure the uniqueness of transactions."}]}],"pr":"e8ff6812533f7072a959e795be2410f965b79693ded3f47dcf839cab21ba8d10"}