{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"When do you need to use a persistent nonce in a blockchain?","a":"In blockchain, when ensuring the order and immutability of transactions, persistent nonces are required. In scenarios such as non-fungible token (NFT) transactions, voting systems, supply chain management, etc., to prevent double spending, fraud, and tampering, persistent nonces can ensure the  uniqueness and security of transaction data. Additionally, persistent nonces can also help achieve permission management and access control in blockchain networks. In summary, using persistent nonces in blockchain enhances system security and transparency."}]}],"pr":"eabc21ebd6c3e4f121fbb7bd6fd1f4515f49f92c89026cde3cd17bb4a53aa1b5"}