"Storj is, by far, the market leader for decentralized storage. It is also one of the oldest projects in the space. To date, Storj boasts a community of 20,000 users (uploaders) and 19,000 farmers (storage providers).
The project’s code is open source, so anyone could implement an instance of Storj. That said, Storj Labs, the private company behind Storj, has already built an impressive network. Users pay for access to that network.
The Storj architecture follows the standard model of sharding, encryption, and swarming described above to split and re-compile files."