The oracle problem refers to inefficiencies in bringing external data into isolated blockchain systems. On-chain network protocols are unable to obtain external data by default. Isolation makes blockchains very secure and reliable, but it also makes obtaining and sharing outside data used by smart contracts difficult. Data oracles exist to deliver dependable off-chain data to internal, on-chain environments. The “oracle problem” occurs when a blockchain network is unable to receive this data in order to function properly.