{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"How does a blockchain database implement the destruction of database objects?","a":"Design a destructible data structure: In blockchain databases, in order to support data persistence and traceability, usually adopt a tamper-proof chain data structure. When designing this data structure, the destruction demand of objects needs to be considered, and a destruction identifier or pointer added to each data object."}]}],"pr":"89064d51ca54f63b791ae2c7a1da7e25c718fc7b201c8b4da1329f9572f4587e"}