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 | Account for which announcement is being made |
| 1 | call_hash | H256 | 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
import { ApiPromise, WsProvider } from "@polkadot/api";
import { stringCamelCase } from "@polkadot/util";
const provider = new WsProvider("wss://entrypoint-finney.opentensor.ai:443");
const api = await ApiPromise.create({ provider });
// Build announce call
const real = 0 as any /* MultiAddress */;
const call_hash = 0 as any /* H256 */;
const call = api.tx[stringCamelCase("Proxy")][stringCamelCase("announce")](
real,
call_hash
);Runtime Info
- Pallet Index
- 16
- Call Index
- 6
- First Version
- v149
- Current Version
- v393