SUBMIT A PRSUBMIT AN ISSUElast edit: Dec 10, 2025

Announcements and Developments

This page tracks recent and upcoming changes to the Bittensor protocol and other major events in the Bittensor ecosystem.

December, 2025

Upcoming TAO halving

The first TAO halving event is approaching, which will reduce block rewards by 50%—0.5 TAO per block. This change means less liquidity will be injected each block into the subnet pools. For more information, see the TAO halving documentation.

You can track the halving schedule and countdown on the tao.app explorer, which provides real-time block data and the estimated time remaining until the reward reduction occurs.

Proxies

Status: Implemented

• What: Proxies allow one wallet to perform Bittensor operations on behalf of another, adding a security layer for valuable wallets.
• Key Features:
  • Keep high-value coldkeys in cold storage while using proxies for daily operations.
  • Constrain proxy permissions using ProxyType (e.g., staking-only, transfer-only).
  • Add time-lock delays with public announcements for high-risk actions.

For detailed information, see: Proxies Overview.

MEV Shield

Status: Implemented

MEV Shield encrypts transactions to protect them from maximal extractable value (MEV) attacks.

For detailed information, see: MEV Shield.

Bittensor SDK v10

Status: Released

A new major version of the Bittensor SDK has arrived!

See: Bittensor SDK v10 Migration guide.

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October, 2025

Root claim

Status: Implemented

• What: Root claim replaces the automatic selling of root-alpha dividends and allows users to either accumulate their alpha dividends or enable autosell to sell them off immediately.
• Key Features:
  • Taking no action means your root alpha is kept as Alpha tokens (the new default is Keep).
  • Auto-claims happen automatically and randomly—roughly once every two days per account. Your Keep/Swap setting will apply.
  • To swap your alpha to TAO, call the set_root_claim_type(Swap) extrinsic.
  • Manually claim accumulated alpha on specific subnets by calling the claim_root() extrinsic and providing the list of subnets.

Subnet UID trimming

Status: Implemented (Merged)

• What: UID trimming allows subnet owners to reduce the number of neuron UIDs registered on their subnet, compressing the remaining UIDs to maintain consecutive indexing.
• Key Features:
  • Now allows subnet owners to increase maximum UID count after previous trimming.
  • Removes the lowest-performing neurons based on emission scores.
  • Both temporally immune UIDs and owner-owned UIDs are protected from trimming.
  • After trimming, remaining UIDs are compressed to the left to maintain consecutive indexing

For detailed information, see: UID trimming.

Multiple Incentive Mechanisms Within Subnets

Status: Implemented (Merged)

• What: Multiple incentive mechanisms allow subnet owners to apportion emissions across different evaluation criteria, each running Yuma Consensus independently with separate bond pools
• Key Features:
  • Enables up to 2 incentive mechanisms (IDs 0,1) within each subnet for multi-task validation.
  • Fully backward-compatible with existing miners and validators via mechanism ID 0
  • Each mechanism has its own weight matrix and independent bond pools for consensus calculations
  • All validators participate in all mechanisms with identical stake weights
• Miners can automatically participate in any of the subnet's mechanisms when registering for a subnet
  • Emission distribution control: Subnet owners can set custom emission distributions using the sudo_set_subsubnet_emission_split extrinsic
  • Immediate mechanism number setting: No onset period - changes take effect immediately
  • Rate limiting: Subnet owners can set mechanism numbers once per 7200 blocks

For detailed information, see: Multiple Incentive Mechanisms Within Subnets

Hyperparameter Rate Limiting

Status: WIP

• What: Prevents subnet owners from changing hyperparameters too frequently
• Rules: Cannot change hyperparameters in last 10 blocks of a tempo
• Purpose: Prevent exploitation where subnet owners kick off root validators to take full incentives
• Implementation: Applies 7,200-block rate limit to prevent subnet owner exploitation

See Rate Limits in Bittensor.

Child Key Fee

A percentage fee will be deducted from emissions bound to validator hotkeys through a child hotkey relationship. This is designed to more highly incentivize validators who perform validation work, over child-key-only validators. It is being gradually rolled out to reduce surprise for the community and allow validators to adjust.

Status: Implemented (Merged)

• Plan:
  • Start at 1% (September 10)
  • 30-day delay
  • Increase by 1% per day for 17 days
  • Final rate: 18%

Changes to the Subnet Registration/Deregistration Process

Status: Ready for deployment on September 16, 2025

• Key Changes:

  • Subnet limit remains at 128 initially with no new registrations available immediately
  • Immunity period reduced from 6 months to 4 months from registration block
  • Network rate limit increased to 4 days between registrations
  • Initial lock cost set at 1,000 TAO with standard linear decay mechanism
  • First deregistrations available approximately September 23 (one week after deployment)

  See: Subnet Deregistration

Auto-Staking for Miners

Status: Implemented (Merged)

• What: Miners can automatically stake their mining income to a validator of their choice
• Implementation:
  • New extrinsics set_coldkey_auto_stake_hotkey and get_coldkey_auto_stake_hotkey
  • Set per coldkey, affects all miner hotkeys
  • No transaction fees required
  • Reduces sell pressure by allowing automatic delegation of mining rewards
  • Event emission system being added to distinguish mining vs staking rewards for proper accounting
  • Requires CLI support for configuration and management

Registration Fee Controls

Status: Deployed

• What: Subnet owners can configure neuron registration fees
• Implementation:
  • Subnet owners can configure neuron registration fees between 0.1 and 1 TAO