announce
Call v149 → current #6Announce an upcoming proxy call for time-delayed proxies.
View calls on chainCall Workflow
This diagram shows the call execution flow: starting with announce, passing through validation
(signature, nonce, mortality, fee payment), then pre-dispatch checks, followed by dispatch which emits events: Announced and modifies storage: Announcements, and finally post-dispatch where ExtrinsicSuccess is emitted and fees are settled.
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Used by: validatorsdeveloperswallets
The Big Picture
Time-delayed proxies must announce actions before executing.
Use Cases
- Pre-announce sensitive operations
- Enable veto period
From Chain Metadata
See [`Pallet::announce`].
Input Parameters
| # | Name | Type | Description |
|---|---|---|---|
| 0 | real | MultiAddress AccountIdLookupOf<T> | Account for which announcement is being made |
| 1 | call_hash | H256 CallHashOf<T> | Blake2-256 hash of the call to be executed later |
Permissions
Origin
Unknown
Required Role
Permission data inferred from metadata. May be incomplete.
Requirements
- Caller is a proxy with delay > 0
- MaxPending not exceeded
Effects
Events Emitted
Storage Modified
Postconditions
- Announcement stored
- Announced event emitted
Side Effects
- Announcement deposit reserved
Code Examples
// ----------------------------------------------------------------------
// HEADS UP: 1 arg below has a complex type with no usable default.
// Look for `undefined as any` and replace it with real value
// before running — the snippet compiles, but will fail at runtime as-is.
// ----------------------------------------------------------------------
import { createClient, Binary } from "polkadot-api";
import { getWsProvider } from "polkadot-api/ws";
import { sub } from "@polkadot-api/descriptors"; // generated by: npx papi add sub -w wss://entrypoint-finney.opentensor.ai:443
const client = createClient(getWsProvider("wss://entrypoint-finney.opentensor.ai:443"));
const api = client.getTypedApi(sub);
// Build announce call (typed, named args)
const real = undefined as any /* MultiAddress — replace with real value */;
const call_hash = "0x0000000000000000000000000000000000000000000000000000000000000000";
const tx = api.tx.Proxy.announce({
real,
call_hash,
});Runtime Info
- Pallet Index
- 16
- Call Index
- 6
- First Version
- v149
- Current Version
- v411