{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"The double-spending problem in blockchain is solved by implementing a consensus mechanism.","a":"The double-spending problem in blockchain is mainly solved by introducing consensus mechanisms, timestamps, and the UTXO model. In a decentralized peer-to-peer value transfer system such as Bitcoin, each transaction is broadcasted throughout the entire network, and numerous miners collectively confirm them. The  nodes that receive the transactions verify them, checking if they have been spent before, meaning they exist in the UTXO (Unspent Transaction Output) list. If the transaction output does not exist in the UTXO, the verification fails. Additionally, the concept of a timestamp is introduced in the Bitcoin network to prevent a UTXO from being double-spent."}]}],"pr":"b44c58b27af662580418c29ff8eb2708983279026f1c1d3ba362ac9d4c1532bb"}