A cross-chain distributed storage protocol based on blockchain 3.0. It could be deployed on all public chains, storage networks and personal nodes. With its initiative cross-chain architecture, watcher & proofer roles, Sharder-UTXO & Sharder Keypair, it optimizes the action functions, verification, consensus, and credential mechanisms, contribution quantification, encryption technology, data sharding, file system, smart contract, etc., and greatly improves the security, availability, elasticity of the network.