{"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":"c6869aca83c7bf53763d0fa342ea6a748f63c8169660f7ee1fd630f59dbf1772"}