Transactions

pow-register

Direct submission with zero tip pays no transaction fee, burn or initial collateral purchase. Root is excluded. The proof binds the subnet, signing coldkey and hotkey; reused or stale challenge blocks are rejected. A full subnet applies ordinary pruning and immunity rules. Mine a fresh intent with client.mine_pow_registration and submit it promptly.

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

Parameters

Parameter	Type	Required	Description
`netuid`	integer	yes	Non-root subnet with PoW enabled.
`work_block`	integer	yes	Recent block used for the challenge.
`nonce`	integer	yes	Unsigned 64-bit solution nonce.
`work_hex`	string	yes	32-byte registration seal, encoded as hex.
`hotkey_ss58`	string	no	Hotkey receiving the UID.
`mining_workers`	integer	no	Workers when the CLI refreshes an expired proof.
`mining_timeout`	number	no	Seconds allowed for CLI proof refresh.
`mining_backend`	string	no	auto, gpu, or cpu mining.
`mining_device_ids`	array of integer	no	GPU device ids, or all discovered GPUs.

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 pow-register \
  --netuid <int> \
  --work-block <int> \
  --nonce <int> \
  --work-hex <value> --dry-run
btcli tx pow-register \
  --netuid <int> \
  --work-block <int> \
  --nonce <int> \
  --work-hex <value> -w my_coldkey

Python

import bittensor as bt
from bittensor.wallet import Wallet

wallet = Wallet(name="my_coldkey", hotkey="my_hotkey")
intent = bt.PowRegister(netuid=1, work_block=0, nonce=0, work_hex="...")

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("pow_register", {...}, wallet)

On-chain implementation

SubtensorModule.pow_register — pallets/subtensor/src/macros/dispatches.rs#L854:

#[pallet::call_index(152)]
#[pallet::weight((<T as crate::pallet::Config>::WeightInfo::pow_register(), Pays::No))]
pub fn pow_register(
    origin: OriginFor<T>,
    netuid: NetUid,
    work_block: u64,
    nonce: u64,
    work: [u8; 32],
    hotkey: T::AccountId,
) -> DispatchResult {
    Self::do_pow_register(origin, netuid, work_block, nonce, work, hotkey)
}

Delegates to do_pow_register.

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