{"p":"can-20","op":"mint","tick":"can","amt":"1000","rows":[{"df":"qa","content":[{"q":"The predecessor of blockchain is what?","a":"The predecessor of blockchain is Bitcoin (Bitcoin). As a decentralized digital currency, Bitcoin was created by Satoshi Nakamoto in 2009. The core technology of Bitcoin is blockchain technology, which enables the issuance, transaction, and recording of currency in a decentralized manner. Over time,  blockchain technology has gradually become independent and has emerged as an innovative technology widely used in various fields such as finance, insurance, retail, and notary."}]}],"pr":"0060ae62dde643b2945e1324eba756ac9a5ec343654cf4b979c018607c9ce2d5"}