Siacoin (SC)
Unlock Schedule
Siacoin (SC) Token Unlock & Vesting Schedule
The unlock chart above provides a clear visual overview of the Siacoin (SC) token release schedule, showing when and how tokens enter circulation across investor, team, treasury, and community allocations. Understanding these tokenomics dynamics is critical for evaluating potential supply pressure, inflation impact, and market liquidity over time — key factors that can influence SC price performance.
Each color segment in the chart corresponds to a specific allocation group described in the Allocations section below. Underlying assumptions and data models used to reconstruct this schedule are explained in detail under Assumptions, while broader utility insights and token use cases are covered in Tokenomics & Utility.
Tokenomics & Utility
Monetary policy
SC has no fixed maximum supply. New coins are minted as block rewards to incentivize miners and secure the chain. The block reward began at 300,000 SC and decreases by 1 SC per block until it reaches a permanent floor of 30,000 SC at height 270,000; thereafter, issuance continues at 30,000 SC per block. This schedule produces high early inflation that falls markedly over time. SC amounts are represented in “hastings,” a base unit where 1 SC equals 10^24 hastings. (docs.sia.tech)
In February 2021, a community‑approved hard fork created the Sia Foundation and adjusted the supply schedule slightly. The Foundation receives an on‑chain subsidy—materialized as an output of 131.4 million SC every 4,380 blocks—plus a one‑time initial allocation of roughly 1.5768 billion SC to fund development. This changed the inflation path temporarily for about a year before returning near its pre‑fork trajectory. (sia.tech)
Utility in the protocol
SC is used to:
- Fund file contracts and pay hosts for storage and bandwidth.
- Post host collateral that is returned only upon valid storage proofs.
- Pay miner fees and block rewards.
- Disburse the Foundation subsidy. (sia.tech)
Sia also has a separate, fixed‑supply revenue‑sharing token called Siafunds (SF). There are 10,000 Siafunds in total. When storage contracts finalize, 3.9% of certain contract funds (such as renter storage and bandwidth payments and host collateral) are set aside and distributed pro rata to Siafund holders. Siafunds are treated as securities in the United States and are typically traded OTC rather than on mainstream exchanges. (docs.sia.tech)
Assumptions
- Supply is uncapped; we model historical issuance plus forward emissions through 2035-12-31.
SC has no maximum cap; issuance via PoW continues indefinitely at 30,000 SC per block (plus Foundation subsidy after 2021-02-03). A finite horizon is required to produce concrete token totals for charting.
- Monthly emission approximated using 4,380 blocks per month.
Sia targets 10-minute blocks (~144/day). Foundation payouts are defined as 131.4M SC every 4,380 blocks; we map this to monthly linear unlocks for visualization.
- End date for the initial decaying-reward period set to 2020-07-01.
Docs indicate the 30,000 SC floor was reached ‘by about July 2020’. Exact day varies with realized block times; using July 1 provides a reasonable anchor without affecting the known cumulative 44.55B SC for the period.
- Genesis date is 2015-06-06; developers mined early blocks but there was no premine allocation outside normal PoW.
Official materials and early statements note first ~100 blocks mined by developers pre-release as standard PoW rewards, not a separate genesis/TGE allocation.
- 1. https://docs.sia.tech/legacy/get-started-with-sia/siacoin-total-supply
- 2. https://docs.sia.tech/get-started-with-sia/learn-about-siacoins
- 3. https://sia.tech/learn/hardforks
- 4. https://docs.sia.tech/legacy/forks/navigating-the-2021-sia-hardfork
- 5. https://sia.tech/blog/from-genesis-to-adoption-the-past-present-and-future-of-sia
- 6. https://docs.sia.tech/miscellaneous/siacoin-total-supply
- 7. https://sia.tech/learn/siacoins