Sharder Protocol is a cross-chain distributed storage protocol. The name “Sharder” comes from the word of “shard” in computer science. Sharder client could be deployed on various public chains, storage networks, personal nodes, etc. Sharder Protocol defines multiple objects, action functions, check mechanism, consensus mechanism, contribution quantification, and authorization mechanism, etc., and designs data encryption, data sharding, multi-chain architecture, file system, smart contract, free market, security, availability, elasticity, etc.