{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"What is the purpose of using protocol hashes in blockchains?","a":"Preventing double-spending attacks: In a blockchain network, miners  need to solve a complex mathematical problem."}]}],"pr":"bf09a6e3ab40a194bd1ed78054611749ca245e9b86fe5896d6ecfabad4f88791"}