Sia a blockchain-based file storage solution that encrypts files and stores them on a peer-to-peer network. It is open source, Their goal is to bring a greater degree of privacy to cloud file storage, while also making it faster and cheaper. Cloud storage solutions that currently dominate the market, such as Dropbox and Google Drive, offer limited privacy options. These centralized storage systems control all the files. Sia, along with Storj, Filecoin, and other blockchain storage companies are trying to address these privacy concerns.

Opacity uses the IOTA Tangle for a decentralized file storage solution. IOTA's infrastructure is used to host data. IOTA's platform is specifically designed to be used by IoT devices. Opacity hopes to leverage the benefit's of Tangle's decentralized network to store encrypted data on devices that will serve as nodes. The network is powered by the Ethereum-based OPQ token.