{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"How do objects in a blockchain achieve persistence and immutability?","a":"Distributed  ledger: Blockchain adopts distributed ledger technology, storing data on multiple nodes, each with a complete copy of the ledger. This distributed characteristic ensures the security and reliability of the data, avoiding single points of failure."}]}],"pr":"6467018544d687a33797d2c5c5593902ef3c74d3f7b3de6069fe4101bf33e273"}