Babbitt reported on the 8th, November 8th, 2019 World Blockchain Conference·Wuzhen officially opened at Wuzhen Internet International Convention and Exhibition Center. In the afternoon's "Technology Unbounded: Blockchain Underlying Infrastructure" sub-forum, Chainlink founder and CEO Sergey Nazarov said that smart contracts have connectivity issues, and smart contracts cannot autonomously acquire data and resources outside the blockchain. More than % of smart contract applications need to be connected to the outside of the blockchain. Smart Contract 1.0 is a smart contractual agreement, Smart Contract 2.0 (pass-certified) is a scriptable smart contract, and Smart Contract 3.0 (all other dapps) is a fully integrated smart contract. He also pointed out that Chainlink hopes to expand the definition of smart contracts while implementing smart contracts and related events. The smart contract extends from the transfer token to a logic that defines the state of the event. The relationship between the state change logic and related events creates a completely new technology, the oracle that connects external events with smart contracts. .