{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"What is the data storage method of blockchain?","a":"The main ways of data storage in blockchain mainly include on-chain storage and node database storage. On-chain  storage refers to storing data on the blockchain, including block data and state data. Block data describes the records of each transaction that occurs on the blockchain, such as transfer records; state data records the current status of each account and smart contract, such as balance sheets. Node database storage refers to storing this data in the databases of blockchain nodes, which can be independent databases such as LevelDB, RocksDB, MySQL, etc., or embedded databases. Node databases store all the data in the blockchain network and provide specific data access."}]}],"pr":"3605789b7a5ad28d5278a5de7723f1a5f2e205ef5076570c7981da2ce54e4fa7"}