ContractDB: Secure and Efficient Integration of Large Legacy Data With Blockchain DApps

ContractDB is a framework that solves a major problem with blockchain DApps (decentralized applications, software running on blockchain networks): storing and querying large amounts of data is extremely expensive on-chain. The framework connects DApps to external verifiable databases (VDBs, databases that can prove their results are correct) using techniques like authenticated dictionaries (data structures that create proof of their contents) and a dispute mechanism to verify data and reduce costs.