Sia primary sources — 2026-05-09

Classification takeaway

Sia is best cataloged as decentralized storage-contract infrastructure rather than as a generic permanent storage or decentralized cloud label. The key reusable mechanism is the renter-host file contract: hosts set prices and post collateral, renters choose among competing hosts, and payout depends on proving continued data possession onchain during the proof window. The v2 stack matters because it keeps that contract model while moving coordination into lighter, more modular software.

Primary sources reviewed

1. Main site — https://sia.tech/

   • Best short framing for Sia’s current self-description as decentralized cloud storage.
   • Useful for confirming that the project still presents itself as a user-facing storage network rather than as a pure infrastructure library.

2. Docs landing page — https://docs.sia.tech/

   • Strong concise source for the project’s core framing: no central access point, no gatekeepers, privacy/security emphasis, and open-source stewardship.
   • Helpful as the current operational entry point.

3. About Providing Storage on Sia — https://docs.sia.tech/provide-storage/about-hosting-on-sia

   • Most important current mechanism page.
   • Explains file contracts, host-set pricing, host collateral, storage proofs, proof windows, payout timing, renter-side host scoring, and the 3.9% Siafund fee.
   • This page makes clear that Sia’s real mechanism is a competitive contract market with collateralized service guarantees.

4. Provide Storage landing page — https://sia.tech/provide-storage

   • Useful for showing the present-day host onboarding flow built around hostd, blockchain sync, Siacoin funding, configuration, and contract acceptance.
   • Confirms the modern software surface exposed to operators.

5. From Genesis to Adoption: The Past, Present, and Future of Sia — https://sia.tech/blog/from-genesis-to-adoption-the-past-present-and-future-of-sia

   • Most useful historical and governance source reviewed in this pass.
   • Confirms the original whitepaper URL, the storage-contract origin story, the shift away from the original proof-of-storage-consensus path, the nonprofit Sia Foundation stewardship model, and the move toward hostd, renterd, and indexd.

6. Sia v2: A Fork in the Road — https://sia.tech/blog/sia-v2-a-fork-in-the-road

   • Best source for the current protocol evolution.
   • Especially important for Utreexo, RHP4, prepaid accounts, browser-native QUIC access, contract-management decoupling, and the modular renterd / hostd / walletd stack.

7. Official GitHub org — https://github.com/SiaFoundation

   • Useful for confirming an active official code surface and the Foundation-centered stewardship model referenced in the docs.

Whitepaper / technical-doc status

• The original Sia whitepaper is still linked from the official Sia materials and has been saved locally as sia-whitepaper.pdf.
• For current reasoning, the hosting docs and v2 materials are more analytically useful than the original paper alone because they show where practical authority and operational complexity sit today.

Why it stays in the active corpus

• It is a canonical comparison class for storage systems where trust sits in bilateral or marketplace-style contracts rather than in one protocol-run durability allocator.
• It sharpens the distinction between IPFS-style retrieval/routing layers, Filecoin-style storage-power systems, and host-market systems where proof windows, collateral, and renter-side host scoring drive outcomes.
• It is especially useful because the v2 stack shows how a mature storage protocol can modularize coordination and UX without discarding its underlying contract-and-proof mechanism.