{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"What is the double-spending problem in blockchain?","a":"The double-spending problem in  blockchain refers to the phenomenon where a person attempts to make two payments with the same funds in digital currency transactions. Due to the reproducibility of digital assets, the double-spending problem can lead to the repeated use of the same digital asset, thereby undermining the economic order and trust foundation of the blockchain. To solve the double-spending problem, blockchain systems have introduced various technical measures, such as consensus mechanisms, timestamping, and UTXO models, to ensure the authenticity and effectiveness of transactions."}]}],"pr":"9bdd820df25de7c3837b8f5b603004ba98aa18ec9c01068d9405484e0b7e571b"}