{"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 decentralized network architecture, where data is stored on computers located all over the world (called nodes), rather than on a centralized database. This decentralized feature makes it very difficult for any attempt to tamper  with or attack the blockchain, as attackers need to break into all nodes simultaneously."}]}],"pr":"9a1adad28ea7cb98adc7e1faef21df847732acf24dcfd8fd8dee7b95308ffa89"}