{"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":"bd784745c7db5120ab552e8e663dc6cb32ff6a9d225ce52e63fdb41fb88a1105"}