Decentralized AI and Bittensor: The Grey Area Labs Guide

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Short answer (as of October 21, 2026): Decentralized AI is artificial intelligence that open networks of independent operators train, serve or pay for, instead of one company that owns the models and the data centers. Bittensor, a blockchain launched in January 2021, is built for this: it is divided into subnets, and in each one miners do one kind of AI work, such as serving models, renting out GPUs or training, while validators score that work. With every 12-second block, the chain mints new TAO and divides it among subnets by the moving-average price of each subnet’s own token, alpha, so a market, not a committee, decides where rewards go. This hub links every Grey Area Labs guide to the network.

Key takeaways

  • Every subnet slot is taken. The chain allows at most 128 subnets (Bittensor docs), and all 128 were registered on October 21, 2026, by the chain’s own count.
  • Issuance halves at set thresholds. The chain has minted 0.5 TAO per block since the first halving on December 15, 2025. By October 21, 2026, 11.64 million of the 21 million cap had been issued, and Taostats estimated the next halving for December 12, 2029 (Taostats).
  • The chain is not yet run by stakers. As of October 21, 2026, a permissioned set of authorities produces Bittensor’s blocks under Proof of Authority. A move to Nominated Proof of Stake is planned, with no fixed date (Bittensor docs).
  • Open training has a benchmark. Covenant-72B, a 72-billion-parameter model pre-trained by at least 70 independent peers over the internet on Subnet 3, was announced complete in March 2026. It beat Meta’s LLaMA-2-70B on two of seven tests and trailed it on five (arXiv 2603.08163).

Curated by Ryan Bethencourt, author of TAO: The Bittensor Story and the Rise of Decentralized Intelligence. Facts checked October 21, 2026.

On this page: Start here · The wider AI stack · Latest guides · The book · FAQ · Sources

Start here: six guides to Bittensor

New to Bittensor? Read these six in order.

  1. What is Bittensor? The Complete Guide to TAO, Subnets & Decentralized AI: the starting point, covering how miners, validators and the TAO token fit together and what Dynamic TAO and the Covenant-72B run changed.
  2. Bittensor Subnets Explained: How They Work and Which Subnets Lead (2026): what a subnet is, why the chain caps them at 128, and which subnets led on emission share and market value in October 2026.
  3. Dynamic TAO (dTAO) Explained: How Bittensor Emissions Work in 2026: how each block’s new TAO is split among subnets, and how that rule moved from alpha prices in February 2025 to staking flows in November 2025 to moving-average prices in June and July 2026.
  4. When Is the Next Bittensor Halving? TAO’s Halving Schedule vs Bitcoin: when the next halving is expected, why recycled TAO can move the date, and how issuance thresholds differ from Bitcoin’s block count.
  5. Covenant-72B: How 70 Strangers Trained a 72B AI Model Over the Internet: how independent GPU operators pre-trained a 72-billion-parameter model on Subnet 3, how it scored against LLaMA-2-70B, and why its builder left Bittensor in April 2026.
  6. Bittensor vs OpenAI: The Case for Decentralized AI: a short comparison of closed, company-run labs with Bittensor’s open network, on model quality and on who decides what AI can do.

Decentralized AI in the wider AI stack

Decentralized networks run open models, sell inference beside the big APIs and take on tasks from science. These guides cover that context.

Latest decentralized AI guides

New guides in our Decentralized AI category appear here as they publish, newest first.

The book behind this hub: TAO

Many guides on this page draw on TAO: The Bittensor Story and the Rise of Decentralized Intelligence, Ryan Bethencourt’s narrative history of Bittensor. It follows founders Jacob Steeves and Ala Shaabana from the network’s launch in January 2021 through the July 2024 attack on its software package and the Dynamic TAO upgrade of February 2025 to Covenant-72B and the April 2026 split. It is updated through October 2026 and licensed CC BY-SA 4.0, so you can quote it with credit.

Its final chapter puts the open question this way:

Whether this coordination would prove sufficient to matter, whether it would produce intelligence good enough, fast enough, and cheap enough to compete with centralized alternatives […] was the question that would define the next decade of Bittensor’s existence. The honest answer, once again, was that no one knew. The network was an experiment, and experiments can fail.

Excerpted from TAO: The Bittensor Story and the Rise of Decentralized Intelligence by Ryan Bethencourt, Chapter 17, licensed CC BY-SA 4.0.

Decentralized AI and Bittensor: FAQ

What is decentralized AI?

Decentralized AI is artificial intelligence that open networks of independent operators train, serve or pay for, rather than a single company. Many people contribute GPUs, models or data, and a public protocol measures the work and pays for it, usually in a token. Bittensor is one such network. Others have trained models over the internet too: the Covenant-72B paper of March 2026 compares its run with INTELLECT-1 and Psyche Consilience, which admitted only approved participants.

What is a Bittensor subnet?

A subnet is a competing market inside Bittensor, identified by a number. Its owner defines a task and how to score it; miners do the work, such as serving models, renting out GPUs or training; validators score the miners; and the chain pays them in the subnet’s own token, alpha, which trades against TAO in an on-chain pool. The chain allows at most 128 subnets, and all 128 slots were taken on October 21, 2026. When the limit is reached, a new subnet replaces the non-immune subnet with the lowest moving-average price.

How do subnets earn TAO?

By market price, not by vote. Each block, the chain divides its new TAO among subnets in proportion to the moving-average price of each subnet’s alpha token. It cuts the share of subnets that withhold miner rewards by directing them to the owner’s own hotkeys, and an emission gate shrinks the shares of subnets that fall well below the 32nd-largest share. The TAO goes into the subnet’s pool, and participants are paid in alpha: under the default split, 18 percent to the owner, 41 percent to miners and 41 percent to validators and their stakers. These are the rules in Bittensor’s documentation on October 21, 2026.

How is TAO issued, and when is the next halving?

New TAO is minted with every 12-second block, toward a hard cap of 21 million. Halvings are set by the amount issued, not by block count: the reward halves when issuance reaches 10.5 million, then 15.75 million, and so on. The first halving took effect on December 15, 2025, cutting the reward from 1 TAO to 0.5 TAO per block, about 3,600 TAO a day. On October 21, 2026, 11.64 million TAO had been issued, and Taostats estimated the next halving for December 12, 2029. Recycled TAO, including transaction fees and some registration burns, is subtracted from the count, which pushes halvings later.

Is Bittensor decentralized?

Partly. Taking part in subnets is open: anyone who pays a subnet’s registration cost can mine, and validator permits go to the hotkeys with the most stake. The chain itself is not: as of October 21, 2026, Bittensor’s documentation says a permissioned set of authorities produces and finalizes blocks under Proof of Authority, and that the set is changed through privileged on-chain administration. The docs plan a move to Nominated Proof of Stake and call the timing “a planning estimate, not a fixed activation date.” Governance is disputed: when Covenant AI left Bittensor in April 2026, its founder, Sam Dare, called the network’s governance “decentralization theatre,” according to The Block.

See also AI & Technology, for models and AI in science, and Privacy and Zero-Knowledge Cryptography, for Zcash and zero-knowledge proofs.

Sources

  1. Bittensor documentation: “The network”, “Emissions”, “Chain consensus” and “Running a subnet”, read October 21, 2026. The network; Emissions; Chain consensus; Running a subnet
  2. Subtensor chain state read through the public mainnet and archive endpoints listed in Bittensor’s documentation on October 21, 2026: subnet limit, registered networks (128 subnets plus the root network), total issuance, and the timestamps of blocks 7,103,975 and 7,103,976 (the first halving).
  3. Taostats, Tokenomics (block reward and next halving estimate), read October 21, 2026. taostats.io
  4. Lidin et al., “Covenant-72B: Pre-Training a 72B LLM with Trustless Peers Over-the-Internet,” arXiv 2603.08163, March 9, 2026 (v2 March 10, 2026). arxiv.org
  5. The Block, Covenant AI exits Bittensor, April 9, 2026. theblock.co
  6. NOVA (Subnet 68) repository, Metanova Labs, read October 21, 2026. github.com

About the author

Ryan Bethencourt is an author, biotech investor and founder who writes about decentralized systems and applied frontier technologies. He is the author of The Decentralized Revolution Series: ZERO (Zcash and zero-knowledge privacy), TAO (Bittensor and decentralized AI), LIGHT (Solana), PUNKS (NFTs and crypto art) and DOGE (memecoins). He co-founded IndieBio, the world’s largest seed-stage biotech accelerator, co-founded and led Wild Earth as CEO, and has backed 180+ early-stage biotech, food-tech and longevity companies. He studied molecular genetics at Warwick and bioscience enterprise at Cambridge and MIT. He writes Accelerated on Substack and publishes at Grey Area Labs.

Disclosure: Ryan holds TAO. Nothing here is financial advice.

More about Ryan Bethencourt · All books in The Decentralized Revolution Series

Published October 21, 2026.

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