Roadmap
See what we’re working on, why it matters, and what’s next. Updated quarterly.
Sia’s v2 Hardfork Starts June 6, 2025
The network is undergoing a multistage hardfork—Sia v2— starting on June 6, 2025 to radically improve performance, scalability, and functionality.
All users must upgrade to Sia v2 to continue sending Siacoins, storing data, and providing storage. This includes exchanges, miners, and token holders. The process will finalize on July 4, 2025 — so get yourself updated in time!
What we’re working on
Last updated: June 5, 2025Support HTLC Atomic Swaps
Completed: Q2 2025
Change Sia’s current unlock conditions to a more composable spend policy format to better support DeFI.
Objectives
Improve Renter-Host Protocol Efficiency
Completion: Q2 2025
RHP4 is the next iteration of the renter-host communication layer. It removes inefficiencies in previous protocols and focuses on providing low-latency access to stored data, improving parallelism, and reducing protocol overhead.
Objectives
Contractless Uploads
Completion: Q2 2025
In addition to being more efficient, RHP4 separates the concept of uploading data and storing data in a contract. This allows for uploads without requiring a contract, allowing for parallel uploads and outsourcing of contract management and data repairs to third parties.
Objectives
Explicit Contract Renewals
Completion: Q2 2025
V2 contracts will allow for unlocking unused host and renter funds immediately upon renewal and for the funding of a contract and by rolling over existing funds from the renewed contract. This results in much more efficient use of both renter and host funds.
Objectives
Browser Based Access
Estimated Completion: Q3 2025
Using WebTransport, Sia will allow direct access to hosts within browsers, eliminating the need for intermediaries or additional software downloads. This feature enables users to seamlessly retrieve data stored on Sia.
Objectives
Improve Decentralization of Projects Built on Sia
Estimated Completion: Q3 2025
By leveraging the latest SDK and RHP4 architecture, applications on Sia can directly interact with the storage network, bypassing centralized infrastructure. This shift eliminates reliance on central bottlenecks, reduces latency and significantly improves decentralization. Application developers no longer need to worry about their infrastructure bottlenecking their users.
Objectives
Simplify Onboarding For Users
Estimated Completion: Q3 2025
Users must be able to use Sia without setting up complex software or acquiring Siacoins. They should be able to start interacting with Sia right after signing up for a free account.
Objectives
Simplify Onboarding for Developers
Estimated Completion: Q3 2025
Sia's current development process involves navigating intricate software infrastructure, blockchain syncing, obtaining Siacoin, and setting up reverse proxies. To streamline this for developers, we will introduce a free service and SDK to empower developers to quickly begin building on Sia, eliminating initial hurdles.
Objectives
Reduce Blockchain Storage Requirements
Estimated Completion: Q4 2025
A complete overhaul of Sia’s core consensus; transitioning from a large UTXO database to a compact UTreeXO accumulator. With UTreeXO, the entire history only takes up a couple of megabytes on disk. Perfect for low-resource devices.
Objectives
Reduce Sync Time
Estimated Completion: Q4 2025
With the transition to UTreeXO, nodes can securely synchronize using a few checkpoints rather than validating every block in the chain. Blocks can be validated and checked in parallel rather than serially. That allows for fresh nodes to get started almost instantaneously and finish syncing in the background rather than having to sync the whole chain before getting started.