# kill-pure-proxy (/docs/tx/kill-pure-proxy)

Must be signed *by the pure proxy itself* (i.e. dispatched through it with
`proxy_for=<pure proxy>`), and the parameters must reproduce the exact
creation: spawner, type, index, plus the block height and extrinsic index
of the `create_pure_proxy` call. Irreversible — any funds left in the
account become permanently inaccessible, so empty it first.

| Signer    | Origin                                 | Pallet | Wraps                                                         |
| --------- | -------------------------------------- | ------ | ------------------------------------------------------------- |
| `coldkey` | signed account (pallet role may apply) | Proxy  | [`Proxy.kill_pure`](/code/pallets/proxy/src/lib.rs#L382-L410) |

## Parameters [#parameters]

| Parameter      | Type    | Required | Description                                                 |
| -------------- | ------- | -------- | ----------------------------------------------------------- |
| `spawner_ss58` | string  | yes      | Account that originally created the pure proxy.             |
| `proxy_type`   | string  | no       | Type the pure proxy was created with (must match exactly).  |
| `index`        | integer | no       | Index the pure proxy was created with (must match exactly). |
| `height`       | integer | no       | Block number of the creating create\_pure\_proxy call.      |
| `ext_index`    | integer | no       | Extrinsic index of the creating call within that block.     |

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

## CLI [#cli]

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

```bash
btcli tx kill-pure-proxy \
  --spawner <ss58|name> --dry-run
btcli tx kill-pure-proxy \
  --spawner <ss58|name> -w my_coldkey
```

## Python [#python]

```python
import bittensor as bt
from bittensor.wallet import Wallet

wallet = Wallet(name="my_coldkey", hotkey="my_hotkey")
intent = bt.KillPureProxy(spawner_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](/docs/concepts/client).) Or build the intent by op name, as
an agent would:

```python
result = sub.execute_tool("kill_pure_proxy", {...}, wallet)
```

## On-chain implementation [#on-chain-implementation]

`Proxy.kill_pure` — [`pallets/proxy/src/lib.rs#L384`](/code/pallets/proxy/src/lib.rs#L382-L410):

```rust
#[pallet::call_index(5)]
#[pallet::weight(T::WeightInfo::kill_pure(T::MaxProxies::get()))]
pub fn kill_pure(
    origin: OriginFor<T>,
    spawner: AccountIdLookupOf<T>,
    proxy_type: T::ProxyType,
    index: u16,
    #[pallet::compact] height: BlockNumberFor<T>,
    #[pallet::compact] ext_index: u32,
) -> DispatchResult {
    let who = ensure_signed(origin)?;
    let spawner = T::Lookup::lookup(spawner)?;

    let when = (height, ext_index);
    let proxy = Self::pure_account(&spawner, &proxy_type, index, Some(when))?;
    ensure!(proxy == who, Error::<T>::NoPermission);

    let (_, deposit) = Proxies::<T>::take(&who);
    T::Currency::unreserve(&spawner, deposit);

    Self::deposit_event(Event::PureKilled {
        pure: who,
        spawner,
        proxy_type,
        disambiguation_index: index,
    });

    Ok(())
}
```

Delegates to [`pure_account`](/code/pallets/proxy/src/lib.rs#L907).

Every file is browsable under [/code](/code) exactly as built into the runtime, or as plain text under `/code/raw/<path>` (index: [`/code/index.json`](/code/index.json)).