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announce-coldkey-swap

Announce (commit to) a coldkey swap; executable after the chain's delay.

Step one of the two-step coldkey migration: publishes only the BlakeTwo256 hash of new_coldkey_ss58 — committing to the new key without revealing it — and starts the chain's announcement delay. After the delay, run the swap_coldkey_announced intent to move EVERYTHING this coldkey owns (balance, stake, subnets) to the new key; check timing with the coldkey_swap_announcement read. The first announcement charges the key-swap cost (0.1 TAO, recycled); re-announcing after the chain's reannouncement delay is free. While an announcement is pending, the chain blocks every other signed extrinsic from this coldkey — only the swap-related calls and shielded (encrypted) submission go through — so the account is operationally locked for the full delay. Before announcing, be certain you control the new coldkey and have its mnemonic backed up. A pending announcement can be cancelled with clear_coldkey_swap_announcement, and the legitimate holder can freeze an unauthorized one with dispute_coldkey_swap.

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

Parameters

Parameter	Type	Required	Description
`new_coldkey_ss58`	string	yes	Coldkey that will take over everything this coldkey owns once the swap executes; only its hash is published now.

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 announce-coldkey-swap \
  --new-coldkey <ss58|name> --dry-run
btcli tx announce-coldkey-swap \
  --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.AnnounceColdkeySwap(new_coldkey_ss58="5F...")

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

On-chain implementation

SubtensorModule.announce_coldkey_swap — pallets/subtensor/src/macros/dispatches.rs#L1987:

#[pallet::call_index(125)]
#[pallet::weight(<T as crate::pallet::Config>::WeightInfo::announce_coldkey_swap())]
pub fn announce_coldkey_swap(
    origin: OriginFor<T>,
    new_coldkey_hash: T::Hash,
) -> DispatchResult {
    let who = ensure_signed(origin)?;
    let now = <frame_system::Pallet<T>>::block_number();

    if let Some((when, _)) = ColdkeySwapAnnouncements::<T>::get(who.clone()) {
        let reannouncement_delay = ColdkeySwapReannouncementDelay::<T>::get();
        let min_when = when.saturating_add(reannouncement_delay);
        ensure!(now >= min_when, Error::<T>::ColdkeySwapReannouncedTooEarly);
    } else {
        // Only charge the swap cost on the first announcement
        let swap_cost = Self::get_key_swap_cost();
        Self::charge_swap_cost(&who, swap_cost)?;
    }

    let delay = ColdkeySwapAnnouncementDelay::<T>::get();
    let when = now.saturating_add(delay);
    ColdkeySwapAnnouncements::<T>::insert(who.clone(), (when, new_coldkey_hash.clone()));

    Self::deposit_event(Event::ColdkeySwapAnnounced {
        who,
        new_coldkey_hash,
    });
    Ok(())
}

Delegates to get_key_swap_cost, charge_swap_cost.

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