Storage solutions with Midnight - handling off-chain data with privacy

Blockchain storage is a premium resource. While storing data directly on the ledger ensures immutability, it is often prohibitive for large files and can compromise user privacy if sensitive information is leaked. On the Midnight network, storing large files directly on-chain is impractical and expensive. This is where off-chain storage comes in. You store your data off-chain, then store the proof of that data on-chain. In this guide, you will learn how to integrate off-chain storage solutions like IPFS (InterPlanetary File System) or Arweave with Midnight smart contracts. You will build a document management system that encrypts files before upload, stores them off-chain, and uses Midnight's shielded state to manage access and verify data integrity. By the end of this guide, you will: Understand the strategic trade-off between on-chain and off-chain storage and when to use both. Learn how to use content hashes and cryptographic commitments to verify data integrity. Encrypt sensitive d