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.

YottaChain is developing a blockchain-based file storage solution with enhanced encryption capabilities. The company takes its name from the largest unit of measurement in the metric system. YottaChain aims to create a decentralized storage network that improves upon existing centralized storage systems, as well other blockchain projects working in the storage field such as Filecoin.

MaidSafe wants to create a decentralized file storage and computing solution. Unlike some of their competitors in the blockchain storage sector, they have a grander vision that is somewhat less focused.
MaidSafe is an acronym for: Massive Array of Internet Disks, Secure Access for Everyone. The company hopes to solve the privacy and redundancy issues of centralized cloud storage providers with the help of blockchain technology. They also want to create a marketplace for computing resources, such as processing power.
The SAFE (Secure Access for Everyone) network hopes to provide a secure and autonomous cloud storage and computing solution. Files are encrypted locally. The data is then broken up an distributed across the network.
MaidSafeCoin is a token for the SafeCoin currency. These tokens were released during MaidSAfe’s crowdsale in 2014 and will be swapped for Safecoin at a 1:1 ratio when SafeCoin is released. MaidSafeCoin is listed on the bitcoin blockchain.