EpiK Protocol envisions building a decentralized KG using blockchain technology with trustable storage, incentives, governance and financial capabilities; this creates a trusted, multi-party collaboration platform where all trusted contributors are rewarded fairly while preserving human knowledge at an affordable rate permanently, expanding the horizons of today's AI, and will usher in the era of cognitive intelligence.EpiK Protocol tapped on Filecoin's decentralized storage technology to achieve trusted storage. The underlying technology of Filecoin is IPFS protocol, a peer-to-peer network for storing and sharing data in a distributed system. The protocol organizes the distributed devices into a unified file system and processes all files into a Merkle Trie structure, forming a unique Root Hash. This prevents the storage of duplicate data blocks and the nodes will only need to synchronize with Root Hash for consistency. However, IPFS is lacking in an incentive mechanism and an anti-fraud mechanism. Improving on IPFS, Filecoin (i) designed Proof-of-Storage to incentivise its ecosystem and (ii) combined Zero-Knowledge Proof to design Proof-of-Replication (PoRep) and Proof-of-Spacetime (PoSt) to prevent frauds. Unlike traditional distributed databases such as Hadoop, Filecoin allows foreign parties to self-organize their idle machines into a unified distributed storage system, without having to trust each other. All parties are allowed to store and access data in a permissionless manner under consensus.Similar to how Ethereum is defining a decentralized computing framework, Filecoin is defining a decentralized storage framework. As a general storage framework which will encounter various storage application scenarios, Filecoin's Layer 1 network focuses on large file storage under extremely limited throughput.