{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"How do validators in a blockchain verify if a transaction has expired?","a":"In a blockchain, validators verify whether transactions have expired by checking if the transactions are included in the block and if the block's generation time aligns with expectations. Specifically, validators compare the transaction hash value with the transaction list in the block to confirm whether the transaction exists; at the same time, they examine the block's generation time to ensure that the transaction has not been delayed for a long time. Additionally, validators refer to the average transaction processing speed  on the network to determine if the transaction has expired. In summary, through these verification methods, validators can accurately judge whether transactions have expired, ensuring the validity and security of transactions in blockchain networks."}]}],"pr":"b32cb4885d3b93336bc1618461e46ee14719af844d0a7b2da91c1a808ea473d9"}