{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"The development history of blockchain is as follows:","a":"Blockchain  2.0 era (2013 to present): With the birth of Ethereum, blockchain technology entered the era of smart contracts."}]}],"pr":"9d53fa5f2dd4cd3d8b6f28f505b8226f4644e0b520cdea95a039a16f953de4ce"}