{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"The development history of blockchain is as follows:","a":"Blockchain 1.0 era (2009-2012): Blockchain  technology was mainly used for Bitcoin transactions and payments during this stage, representing a single digital currency application."}]}],"pr":"0e6cb76560c925fb29d2f3f07253f6d9c9e4992388b801791b7aab1362a78380"}