The Sharder Protocol is a blockchain-based cross-chain distributed storage protocol, which provides: a cost-effective storage space, reliable data storage, and transparent on-chain information. Eventually, all storage space, stored data, and digital assets will together form a free market. It could be deployed on all public chains, storage networks and personal nodes. Sharder Protocols initiative cross-chain architecture, watcher & prover roles, and the Sharder-UTXO & Sharder Keypair optimizes action functions, verifications, consensus, credential mechanisms, contribution quantification, encryption technology, data sharding, file systems, smart contracts, and etc. Network security, availability, and elasticity is greatly improved through Sharder Protocol.