{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"How do smart contracts in blockchain implement data storage and persistence?","a":"Smart contracts in blockchain achieve data storage and persistence by using Storage API. Storage API provides five related APIs for performing data operations such as insertion, deletion, modification, and query in blockchain smart contracts. These APIs include: GetContext and GetReadOnlyContext for obtaining the context in which the smart contract is running; Put for storing data in the  blockchain in dictionary format; Get for reading data in the blockchain by key; and Delete for deleting data in the blockchain by key. Through these APIs, smart contracts can achieve data storage and persistence, ensuring the security and traceability of data on the blockchain."}]}],"pr":"ef8ddbbda9d459b5aa5fb4b70ed6f9f4e56a22592efdb4ed0d64a05e282e19e3"}