{"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":"17154f5414dd3803743ad56ccf08c0fb455e23525d12749f9c8816273a45227b"}