Sia - Decentralized data storage
Decentralized data storage

Cryptography has unleashed the latent power of the Internet by enabling interactions between mutually-distrusting parties. Sia [sigh-uh] harnesses this power to create a trustless cloud storage marketplace, allowing buyers and sellers to transact directly. No intermediaries, no borders, no vendor lock-in, no spying, no throttling, no walled gardens; it's a return to the Internet we once knew. The future is making a comeback.


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Learn all about how Sia works, why it was created, and the non-profit foundation that maintains it.

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The Sia Foundation welcomes contributors from all over the world to come and build on Sia through our Grants program.

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Sia is a vibrant community of contributors building open source and commercial data storage software on the Sia network.


A next-generation Sia renter, developed by the Sia Foundation. Smart defaults and a highly extensible API.

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Screenshot of renterd

A next-generation Sia host, developed by the Sia Foundation. Built for performance and reliability.

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Screenshot of hostd

Sia is a thriving ecosystem of data storage enthusiasts, open source software, and commercial data storage platforms.


S3-compatible object storage powered by blockchain and the Sia network.

Learn more about Filebase

Private and decentralized cloud storage app with encrypted file sharing and media streaming support.

Learn more about Vup

File sharing site that uses the Sia network.

Learn more about PixelDrain

Decentralized CDN and file sharing platform for developers.

Learn more about Skynet

Customizable secure multi-cloud in France. End-to-end encryption. Very high availability. No commitment.

Learn more about Arzen
Completely Private

Sia encrypts and distributes your files across a decentralized network. Unlike traditional cloud storage providers, you truly own your data: no third party can access your files or prevent you from accessing them.

Highly Redundant

Sia distributes and stores redundant file segments on nodes across the globe, eliminating any single point of failure and achieving uptime and throughput that no centralized provider can compete with.

Far More Affordable

On average, Sia's decentralized cloud storage costs 90% less than incumbent cloud storage providers. Storing 1 TB of files on Sia costs about $1-2 per month, compared with $23 on Amazon S3 - bandwidth is also a magnitude cheaper.

Designed for integration

The Sia software exposes highly modular JSON-speaking endpoints. renterd can even scale horizontally: in stateless mode, it provides raw access to the Sia renter-host protocol, with no UI, no blockchain, and no disk I/O — perfect for massive renting operations.

R&D leader

The Sia storage network has been securely storing data since 2014. Sia has pioneered the use of many new technologies at scale, such as its use of state channels to process an estimated 20 billion micropayments per day.

Open Source

Sia's software is completely open source, with contributions from leading software engineers. Sia has a thriving community of developers and companies building innovative applications and businesses on top of Sia.