OpenLink is like a transit box. The connection and verification between the blockchain and specific data in the real world are processed through this box. It provides reliable data sources for applications on the blockchain and ensures the normal operation of the blockchain. The function of the Oracle is to write external information into the blockchain and complete the data exchange between the blockchain and the real world. It allows the determined smart contract to respond to the uncertain external world. It is the only way for the smart contract to interact with the external data, and it is also the interface between the blockchain and the real world.

OpenLink has an online module, aggregation contract. Users can choose their own nodes and services. The aggregation contract will collect the data returned by the Oracle, aggregate the data, and calculate the final required results. The off chain architecture of OpenLink is the Oracle node network. These nodes respectively obtain the data under the chain and send it to the aggregation contract to get the final result. The following describes in detail how to aggregate multiple returned results into a single data. OpenLink's node software is open source, which includes standard blockchain interaction, scheduling and connecting common offline resources.