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Binaries can be found at our website.

Sia is a new decentralized cloud storage platform aimed at giving users control of their data. Data is split into hundreds of erasure coded pieces and encrypted locally, and then each piece is uploaded to a separate host. A blockchain is used to create cryptographic contracts ensuring that hosts will only get paid if they actually store the data. Out of hundreds of hosts, only a fraction are required to recover the original file.

Anybody can join the network as a host and get income from the storage they contribute. This openness allows Sia to build and take advantage of a global network of small datacenters. Combined with advanced algorithms for storing and retrieving data, Sia is poised to be a highly competitive cloud storage platform. More information about the technology can be found on our website and in the 'doc' folder of the repo.

Sia is currently in beta, and will be launching the currency on June 7th, 2015. Even though the currency is launching, the storage platform itself will remain in beta. Sia is ready for use with small sums of money and non-critical files, but until the network has a more proven track record we advise against relying on Sia as a sole means of storing important data.

This release comes with 2 binaries, siad and siac. siad is a background service, or "daemon," that runs the Sia protocol, and siac is a client that is used to interact with siad. Siad exposes an API on 'localhost:9980' which can be used to interact with the daemon. There is a front-end program called Sia-UI which can be used to interact with the daemon in a more user-friendly way. Documentation on the API can be found in doc/


siad and siac are run via command prompt. On Windows, you can just double- click siad.exe if you don't need to specify any command-line arguments. Otherwise, navigate to the sia folder and click File->Open command prompt. Then, start the siad service by entering siad and pressing Enter. The command prompt may appear to freeze; this means siad is waiting for requests. Windows users may see a warning from the Windows Firewall; be sure to check both boxes ("Private networks" and "Public networks") and click "Allow access." You can now run siac in a separate command prompt to interact with siad. From here, you can send money, mine blocks, upload and download files, and advertise yourself as a host.


  • The client does not appear to join the network.

    There should be at least one peer online for you to connect to, so if you cannot connect, you may be experiencing connection issues. Ensure that you are connected to the Internet. If you are confident that your connection is okay, contact us! Our server may be experiencing problems.

    You can also opt not to connect to join the network by passing the "-n" flag to siad.

  • I can't connect to more than 8 peers.

    Once Sia has connected to 8 peers, it will stop trying to form new connections, but it will still accept incoming connection requests (up to 128 total peers). However, if you are behind a firewall, you will not be able to accept incoming connections. You must configure your firewall to allow Sia connections by forwarding your ports. By default, Sia communicates on ports 9981 and 9982. The specific instructions for forwarding a port vary by router. For more information, consult this guide.

    In future versions, we will add support for UPnP, which may allow you to skip this step if your router supports it.

  • I mined a block, but I didn't receive any money.

    There is a 144-block confirmation delay before you will receive siacoins from mined blocks. If you still have not received the block reward after 144 blocks, it means your block did not made it into the blockchain.

  • siad complains about "locks held too long."

    This is debugging output, and should not occur during normal use. Please contact us if this happens.

If your issue is not addressed above, you can get in touch with us personally:


IRC: #siatalk on freenode (ping Taek)

Version Information

  • If you intend to host files, you must forward your host port, and you should do so before making your host announcement. The default host port is 9982.

Please tell us about any problems you run into, and any features you want! The advantage of being a beta user is that your feedback will have a large impact on what we do in the next few months. Thank you!

Version History

June 2015:

v0.3.3.3: Third stable currency patch.

  • Host announcements can be "forced"
  • Wallets can be merged
  • Unresponsive addresses are pruned from the node list

v0.3.3.2: Second stable currency patch.

  • Siafunds can be loaded and sent
  • Added block explorer
  • Patched two critical security vulnerabilities

v0.3.3.1: Hotfixed stable currency release.

  • Mining API sends headers instead of entire blocks
  • Slashed default hosting price

v0.3.3: Stable currency release.

  • Set release target
  • Added progress bars to uploads
  • Rigorous testing of consensus code

May 2015:

v0.3.2: Fourth open beta release.

  • Switched encryption from block cipher to stream cipher
  • Updates are now signed
  • Added API calls to support external miners

v0.3.1: Third open beta release.

  • Blocks are now stored on-disk in a database
  • Files can be shared via .sia files or ASCII-encoded data
  • RPCs are now multiplexed over one physical connection

March 2015:

v0.3.0: Second open beta release.

Jan 2015:

v0.2.0: First open beta release.

Dec 2014:

v0.1.0: Closed beta release.


Blockchain-based marketplace for file storage




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