{"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":"Timestamps: Each block in blockchain contains a timestamp indicating when the block was created. This timestamp  ensures that the order of blocks is consistent and prevents tampering with"}]}],"pr":"ea72a0885db4e84e6f6a8170a23e0e87e225ad99844cf105f4ab04863f1d89ab"}