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Sia is a decentralized cloud storage platform that utilizes blockchain technology. It allows users to rent storage space from each other, ensuring security and affordability. The platform emphasizes privacy, as the data is encrypted and distributed across a decentralized network.
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renterd, hostd, and walletd received precision enhancements, OpenAPI specification additions for better developer integration, and UI refinements 2. The Sia Storage App, in internal alpha, showed progress in syncing and onboarding, with future focus on photo library sync 2.Biggest Stories of 2025
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V2 — The Final Cut network upgrade completed, concluding the V1 era with deprecated field removal, a difficulty adjustment bug fix, and preparations for parallel and instant syncing. (December 2, 2025) 4
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The State of Sia, November 2025 reported the Grants Committee recess from December 9th until January 14th, a new policy requiring grant-funded software to be released under an OSI-compliant license effective November 28th, and the completion of major grant projects including S5 Gateway/TypeScript Client and Cypherock X1 hardware wallet integration. (November 2025) 5
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Sia hostd v2.5.1 released, fixing a V2 contract renewal issue for contracts with capacity greater than size, addressing integrity checks using cache, and preventing overwriting an existing revision with an older one. (November 12, 2025) 6
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The State of Sia, October 2025 detailed progress toward the December V2 upgrade, including reducing client size from 80 GB to 200 MB and full chain sync time from 12 hours to one hour. (October 2025) 2
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V2 — The Final Cut network upgrade announced and scheduled for block 552,100, estimated for the first week of December 2025, requiring all active nodes to upgrade to maintain consensus. (October 10, 2025) 1
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The State of Sia, September 2025 highlighted the release of a new Grants Development Guide, engineering insights gathered at RustConf 2025 for the new Sia SDK and mobile app, and the completion of the grant-funded Luogo privacy-focused location-sharing app. (October 10, 2025) 3
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Sia hostd v2.4.1 released, updating a core dependency from v0.17.4 to v0.17.5 and the coreutils dependency from v0.18.2 to v0.18.4. (September 5, 2025) 7
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The State of Sia, August 2025 reported that the Growth Team attended DEF CON 33,
renterd v2.6.0improved contract management robustness, andhostd v2.4.0retired support for legacy RHP2/RHP3 protocols. (September 23, 2025) 8 -
The State of Sia, July 2025 marked the successful completion of the v2 Hardfork on July 3rd, establishing a more efficient decentralized storage foundation, alongside stability and performance enhancements across
renterd,hostd, andwalletd. (August 21, 2025) 9 -
Sia rebranded as part of the v2 hardfork activation, introducing a new logo and messaging emphasizing user control over data through decentralized infrastructure. (June 6, 2025) 10
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The Sia v2 hard fork was successfully completed. (June 6, 2025) 11
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Final reminder issued for the v2 hard fork activation, requiring nodes running
hostd,renterd, orwalletdto update to v2.2.0, v2.2.1, and v2.9.0 respectively, and hosts to open TCP and UDP port 9984 to support RHP4. (June 5, 2025) 12 -
The Sia Foundation provided an update outlining action required by June 6, 2025, including that all Sia terminal app users of
hostd,renterd, andwalletdmust upgrade to the latest versions, and that the Ledger app would stop working on that date. (June 2, 2025) 13 -
"From Genesis to Adoption" retrospective published, tracing Sia's evolution from its 2013 inception by David Vorick and Luke Champine, through its 2015 launch and 2018 ASIC mining disputes, to its preparation for the v2 hardfork incorporating Utreexo technology and the introduction of indexd. (May 21, 2025) 14
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The Sia Foundation announced that all exchanges must upgrade from
siadtowalletdto track and manage deposits before the V2 hardfork at block height 526,000, scheduled for June 6, 2025. (April 15, 2025) 15 -
The State of Sia, February 2025 reported the release of
renterd v2.0.0with full RHP4 protocol support,walletd v2.0.0enhancing security and usability, and new grants including SAI, a Python framework for AI-powered interactions with Sia'swalletd. (March 19, 2025) 16 -
The State of Sia, January 2025 detailed significant development progress across
renterd,hostd, andwalletd, with the V2 hardfork's "Allow Height" phase set for June 6, 2025, and "Require Height" for July 6, 2025. (February 25, 2025) 17 -
"Your Personal Sia Cloud" published, describing the Sia Foundation as a 501(c)(3) non-profit launched in early 2021, uniquely sustained by a protocol-enforced community donation of a small portion of newly mined Siacoin rather than venture capital or advertising. (January 9, 2025) 18
About & Links
About & Links
Sia is a decentralized cloud storage platform that utilizes blockchain technology. It allows users to rent storage space from each other, ensuring security and affordability. The platform emphasizes privacy, as the data is encrypted and distributed across a decentralized network.
Siacoin Founders
Siacoin Profile
Siacoin Profile
Siacoin was launched in 2014 with the Sia blockchain by Boston-based Nebulous, Inc. The Sia network is now developed by the non-profit Sia Foundation. The Sia Foundation is focused on developing the Sia blockchain and ecosystem. The foundation is funded by a perpetual Siacoin subsidy, which was added to the Sia blockchain by a successful hard fork (i.e., software update) adopted by a majority of the network's users in February 2021. All code, research, educational resources, and other offerings from the foundation are available to the public free of charge and through open-source licenses.
Sia connects “hosts” that have underutilized hard-drive capacity with “renters” in search of data storage. The aim is to provide peer-hosted storage of files, without the need for a single centralized entity to control the data. Files of individual users are broken up and spread across a number of hosts. These hosts need to provide proof of file storage on a regular basis in order to receive payment and not be penalized. Payment is in the form of Siacoin and penalties involve the host losing Siacoin collateral that was posted by the host. The proofs are available on the Sia blockchain for verification by miners, who also receive payment in the form of Siacoin for their verification work. Sia generates revenue from fees on all storage contracts. This is done through the existence of so-called Siafunds. When a contract is created, 3.9% of the contract fund is removed and distributed to the holders of Siafunds. Nebulous started off holding 88%, with the remainder held by early backers of Sia. Siafunds can be transferred to other addresses but are not used as payments on the platform.
In December 2024, the Sia Foundation published a milestone update detailing major improvements across the Sia ecosystem, with the primary focus on the upcoming v2 hardfork scheduled for mid-2025.
In February 2025, the Sia Foundation announced several major core releases and new grant initiatives ahead of the v2 hardfork. renterd v2.0.0 launched full v2 support, including an API refactor and complete RHP4 integration for stable, efficient renter-host interactions.
In June 2025, the Sia v2 hardfork went live, coinciding with the network's 10-year anniversary.
In September 2025, The Foundation unveiled a new Grants Development Guide, designed to streamline technical reviews and help grantees better meet milestone expectations.