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

The chain derives a new address from the signer, `proxy_type`, `index`,
and the creation block. Nobody holds its private key — the spawner controls
it purely through the proxy relationship, which makes it useful as a
disposable or role-scoped account (e.g. a Staking-only treasury). Record the
creation block and extrinsic index (shown in the result): `kill_pure_proxy`
needs them to close the account later. Losing the spawner key means losing
the pure proxy and anything it holds.

| Signer    | Origin                                 | Pallet | Wraps                                                           |
| --------- | -------------------------------------- | ------ | --------------------------------------------------------------- |
| `coldkey` | signed account (pallet role may apply) | Proxy  | [`Proxy.create_pure`](/code/pallets/proxy/src/lib.rs#L330-L364) |

## Parameters [#parameters]

| Parameter    | Type    | Required | Description                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
| ------------ | ------- | -------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `proxy_type` | string  | no       | Scope of calls the delegation covers. One of: Any, Owner, NonCritical, NonTransfer, Senate, NonFungible, Triumvirate, Governance, Staking, Registration, Transfer, SmallTransfer, RootWeights, ChildKeys, SudoUncheckedSetCode, SwapHotkey, SubnetLeaseBeneficiary, RootClaim. Triumvirate, Senate, Governance, and RootWeights are deprecated on the current runtime: they deny all calls, so a proxy of those types can dispatch nothing. Prefer the narrowest type that covers your use; Any can do everything the account can, including transfers. |
| `delay`      | integer | no       | Announcement delay in blocks: the delegate must announce each call and wait this long before executing it, giving you time to veto. 0 executes immediately.                                                                                                                                                                                                                                                                                                                                                                                             |
| `index`      | integer | no       | Disambiguator so one signer can create several pure proxies in one block; also part of the derived address. Keep 0 unless batching.                                                                                                                                                                                                                                                                                                                                                                                                                     |

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 create-pure-proxy --dry-run
btcli tx create-pure-proxy -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.CreatePureProxy()

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("create_pure_proxy", {...}, wallet)
```

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

`Proxy.create_pure` — [`pallets/proxy/src/lib.rs#L332`](/code/pallets/proxy/src/lib.rs#L330-L364):

```rust
#[pallet::call_index(4)]
#[pallet::weight(T::WeightInfo::create_pure(T::MaxProxies::get()))]
pub fn create_pure(
    origin: OriginFor<T>,
    proxy_type: T::ProxyType,
    delay: BlockNumberFor<T>,
    index: u16,
) -> DispatchResult {
    let who = ensure_signed(origin)?;

    let pure = Self::pure_account(&who, &proxy_type, index, None)?;
    ensure!(!Proxies::<T>::contains_key(&pure), Error::<T>::Duplicate);

    let proxy_def = ProxyDefinition {
        delegate: who.clone(),
        proxy_type: proxy_type.clone(),
        delay,
    };
    let bounded_proxies: BoundedVec<_, T::MaxProxies> = vec![proxy_def]
        .try_into()
        .map_err(|_| Error::<T>::TooMany)?;

    let deposit = T::ProxyDepositBase::get().saturating_add(T::ProxyDepositFactor::get());
    T::Currency::reserve(&who, deposit)?;

    Proxies::<T>::insert(&pure, (bounded_proxies, deposit));
    Self::deposit_event(Event::PureCreated {
        pure,
        who,
        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)).