How can I securely transfer a large volume of data using blockchain while maintaining decentralization? For example, I want to retrieve data from BigQuery using PowerBI without revealing the data source (BigQuery) to the PowerBI user. Basically, I need a blockchain application that acts as an intermediary between the two platforms. What approaches or technologies should I consider to achieve this? or any guide..

I want to decentralize the data so that no one can trace the data source, based on a smart contract. I want to send data to the user securely (Blockchain & Data Engineering project)