Neuron Registration

Neurons are server nodes in each subnet. To become a validator or miner on a subnet you must register a neuron.

Neuron Registration

To obtain a UID (unique slot number for a neuron) on a particular subnet you must register your hotkey. The cost of the slot is variable and can be found using the command line btcli subnets list. The recycle cost is the cost to register a neuron).

The burn cost decays smoothly each block, ensuring the price halves from the last registration cost every half life blocks. At each registration the burn cost is increased by a multiplier Burn Increase Multiplier (clamped between limits). It is possible to register multiple neurons per block

This allows the registration costs to be defined by natural market forces of demand. A historical chart is available on the subnet’s page on Taostats to see the current costs for each subnet:

All new miners & validators are placed into immunity for a preset amount of time. The immunity period can be adjusted per subnet. A miner with immunity cannot be de-registered.

Immunity period

To retrieve the immunity period (in blocks), you can use the Bittensor CLI to select a Subnet. The output includes the immunity_period. For subnet 1, it is 7200 blocks:

btcli sudo get
Enter netuid [0/1/2/3/4/5/6/7/8/9/10/11/12/13/14/15/16/17/18/19/20/21/22/23/24/25/26/27/28/29/30/31/32] (0): 1
Bittensor Version: Current 6.6.0/Latest 6.7.0
Please update to the latest version at your earliest convenience. Run the following command to upgrade:

python -m pip install --upgrade bittensor
  Subnet Hyperparameters - NETUID: 1 - finney
 HYPERPARAMETER            VALUE
 rho                       10
 kappa                     32767
 immunity_period           7200
 min_allowed_weights       8
 max_weight_limit          455
 tempo                     99
 min_difficulty            1000000000000000000
 max_difficulty            1000000000000000000
 weights_version           10000
 weights_rate_limit        100
 adjustment_interval       112
 activity_cutoff           5000
 registration_allowed      True
 target_regs_per_interval  2
 min_burn                  50000000
 max_burn                  100000000000
 bonds_moving_avg          900000
 max_regs_per_block        1
 serving_rate_limit        10
 max_validators            128

Recycling of Fees

Any tao spent on registration is converted into alpha and recycled - it is returned to the unissued supply (thus slowly lengthening the time until the next halvening). The tao recycled for registration is NOT returned to the miner upon de-registration and is considered part of the operational costs to be factored into the profitability calculations when mining.

Neuron De-registration

When a new miner/validator registers their hotkey, the neuron/node with the lowest emissions ranking in the subnet is de-registered.

Miners & validators that have immunity cannot be de-registered.

If your subnet is deregistered for a new subnet, all neurons are de-registered.