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swap-coldkey-announced

Execute a previously announced coldkey swap (after the delay has passed).

Step two of the two-step migration: reveals the new coldkey and moves everything the signing coldkey owns — balance, stake, and subnet ownership — to it. Irreversible once included. The revealed key must hash to exactly what announce_coldkey_swap committed to, and the call fails if the announcement delay has not elapsed, no announcement exists, or the swap is frozen by a dispute. After it succeeds, the old coldkey is empty; all future operations sign with the new coldkey.

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

Parameters

Parameter	Type	Required	Description
`new_coldkey_ss58`	string	yes	Coldkey receiving everything; must match the previously announced hash exactly.

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 swap-coldkey-announced \
  --new-coldkey <ss58|name> --dry-run
btcli tx swap-coldkey-announced \
  --new-coldkey <ss58|name> -w my_coldkey

Python

import bittensor as bt
from bittensor.wallet import Wallet

wallet = Wallet(name="my_coldkey", hotkey="my_hotkey")
intent = bt.SwapColdkeyAnnounced(new_coldkey_ss58="5G...destination")

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

On-chain implementation

SubtensorModule.swap_coldkey_announced — pallets/subtensor/src/macros/dispatches.rs#L2406:

#[pallet::call_index(126)]
#[pallet::weight((Pallet::<T>::swap_coldkey_announced_declared_weight(), DispatchClass::Normal, Pays::Yes))]
pub fn swap_coldkey_announced(
    origin: OriginFor<T>,
    new_coldkey: T::AccountId,
) -> DispatchResultWithPostInfo {
    let who = ensure_signed(origin)?;

    // A swap refused by the announcement checks read one row; charge that plus
    // the benchmarked base, not the envelope of `MAX_COLDKEY_SWAP_POSITIONS`
    // stake transfers.
    let base = <T as crate::pallet::Config>::WeightInfo::swap_coldkey_announced();
    let precheck = base.saturating_add(T::DbWeight::get().reads(1));
    let (when, new_coldkey_hash) = ColdkeySwapAnnouncements::<T>::take(who.clone()).ok_or(
        Self::fail_with_weight(Error::<T>::ColdkeySwapAnnouncementNotFound, precheck),
    )?;

    ensure!(
        new_coldkey_hash == T::Hashing::hash_of(&new_coldkey),
        Self::fail_with_weight(Error::<T>::AnnouncedColdkeyHashDoesNotMatch, precheck)
    );

    let now = <frame_system::Pallet<T>>::block_number();
    ensure!(
        now >= when,
        Self::fail_with_weight(Error::<T>::ColdkeySwapTooEarly, precheck)
    );

    let work =
        Self::do_swap_coldkey_tracked(&who, &new_coldkey).map_err(|(done, error)| {
            Self::fail_with_weight(error, base.saturating_add(done))
        })?;

    Ok((
        Some(Self::swap_coldkey_announced_actual_weight(work)),
        Pays::Yes,
    )
        .into())
}

Delegates to fail_with_weight, do_swap_coldkey_tracked, swap_coldkey_announced_actual_weight.

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