{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"How can blockchain be applied to electronic evidence preservation?","a":"Encryption technology: Blockchain technology assigns a timestamp to electronic evidence when it is generated, and verifies the integrity of  the data through the hash algorithm."}]}],"pr":"44d8a4986ac96686478f4922856723451f7afb5a46e8efb1fda262febc25ea8c"}