Data is stored in the blockchain forever and can be retrieved using a transaction hash as an identifier. Datacoin is a platform that can be used by applications such as torrent trackers, encrypted messaging services,  and can be used to store other kinds of small data all censorship-free. Developers can store torrent files, certificates, computer programs, HTML pages and other kinds of meta information  in the Datacoin blockchain. Windows users can use a GUI wallet, Linux users should compile datacoind or Datacoin QT from source.