Transactions

set-min-collateral

Set the self-maintaining collateral floor for your hotkey on a subnet.

The collateral drain never releases the lock below the floor, and while the lock is under it, earned miner incentive is captured into the lock until the floor is met — so a miner tracking a validator-published collateral requirement does not need to keep re-locking drained funds. Raising the floor above the current lock does not require fresh capital: the shortfall fills from future incentive (use add_collateral to fund it immediately). Zero clears the floor and restores pure drain behavior.

Signer	Origin	Pallet	Wraps
`coldkey`	signed account (pallet role may apply)	SubtensorModule	`SubtensorModule.set_min_collateral`

Parameters

Parameter	Type	Required	Description
`netuid`	integer	yes	Subnet the floor applies to.
`min_alpha`	number \| `"all"`	yes	The floor, in the subnet's alpha. Zero clears it.
`hotkey_ss58`	string	no	Miner hotkey the floor applies to. Defaults to the wallet hotkey.

Address parameters (--hotkey, --coldkey, --dest, ...) accept a raw ss58 address, an address-book or proxy-book name, or a local wallet/hotkey name.

CLI

Preview with --dry-run (shows fee, effects, and policy result without submitting), then submit:

btcli tx set-min-collateral \
  --netuid <int> \
  --min-alpha <amount|all> --dry-run
btcli tx set-min-collateral \
  --netuid <int> \
  --min-alpha <amount|all> -w my_coldkey

Python

import bittensor as bt
from bittensor.wallet import Wallet

wallet = Wallet(name="my_coldkey", hotkey="my_hotkey")
intent = bt.SetMinCollateral(netuid=1, min_alpha=1.0)

sub = bt.Subtensor()
plan = sub.plan(intent, wallet)   # fee, effects, policy — no submission
result = sub.execute(intent, wallet)
if not result.success:
    print(result.error.code, result.error.remediation)

(bt.Subtensor is also the async client — async with bt.Subtensor() as client: — see The client.) Or build the intent by op name, as an agent would:

result = sub.execute_tool("set_min_collateral", {...}, wallet)

On-chain implementation

SubtensorModule.set_min_collateral — pallets/subtensor/src/macros/dispatches.rs#L2479:

#[pallet::call_index(145)]
#[pallet::weight(<T as crate::pallet::Config>::WeightInfo::set_min_collateral())]
pub fn set_min_collateral(
    origin: OriginFor<T>,
    netuid: NetUid,
    hotkey: T::AccountId,
    min_locked: AlphaBalance,
) -> DispatchResult {
    Self::do_set_min_collateral(origin, netuid, hotkey, min_locked)
}

Delegates to do_set_min_collateral.

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