Building hybrid blockchain/cloud applications

In this blog post, we describe a few applications of making internet-hosted data available inside an immutable public blockchain: placing BigQuery data available on-chain using a Chainlink oracle smart contract. To close the loop and allow bidirectional interoperation, we need to be not only making blockchain data programmatically available to cloud services, but also cloud services programmatically available on-chain to smart contracts. How we built it

At a high level, Ethereum Dapps (i.e. smart contract applications) request data from Chainlink, which in turn retrieves data from a web service built with Google App Engine and BigQuery.

Source: cloud.google.com