{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"How can the fairness and security of program execution be ensured in a blockchain?","a":"Decentralization: Blockchain adopts a distributed network architecture, storing data on computers located all over the world (called nodes) rather than on a centralized server. This decentralized design makes the blockchain system less vulnerable to hacker attacks because attackers need to break into all  nodes simultaneously, which is virtually impossible."}]}],"pr":"425d2f2a1dba871ff41a58b3f4531c1d0a73b6cb143b6f8ae8dd538d6dd3d3b7"}