HALO is a decentralized Oracle machine solution that can provide a complete off chain data solution for any smart contract on the basic chain. It adopts a node ecosystem mechanism of quotation+dual role verification, where any user can become a quotation node through a low threshold pledge of HALO tokens and receive mining rewards. Institutional verification nodes audited by the HALO community and high threshold ordinary verification nodes can provide the ultimate security guarantee for the entire network in the verification and arbitration stages.This mechanism takes into account both decentralization characteristics and data attack resistance....