{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"How to solve the double-spending problem in a blockchain network?","a":"Introduction of timestamps: In order to prevent a UTXO (Unspent Transaction Output) from being double-spent, the concept of timestamps was introduced in the Bitcoin network. During each transaction, the system compares  the current timestamp with previous timestamps to ensure that only one transaction occurs within a certain period."}]}],"pr":"cd9bf89d67639df24180b33565428c6fc99067a1c7def9f575d00f32f78408c4"}