{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"How to use system calls to return the remaining computing units in the blockchain?","a":"Understand the principles of the blockchain system: A blockchain is a decentralized distributed database that ensures data security and consistency through encryption algorithms and consensus mechanisms. Computing units (also known as  nodes) are the basic components of the blockchain network, responsible for validating transactions, creating new blocks, and spreading information."}]}],"pr":"d205e1a92034b08f5c72d6e9ef1a2599c8fc2037ef43a81ddc7f72768c5ede12"}