Call Workflow
This diagram shows the call execution flow: starting with unrequest_preimage, passing through validation
(signature, nonce, mortality, fee payment), then pre-dispatch checks, followed by dispatch which emits events: Requested, Cleared and modifies storage: StatusFor, RequestStatusFor, and finally post-dispatch where ExtrinsicSuccess is emitted and fees are settled.
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Used by: validatorsdevelopers
The Big Picture
Allows preimage to be cleared.
Use Cases
- Release preimage after use
From Chain Metadata
Clear a previously made request for a preimage. NOTE: THIS MUST NOT BE CALLED ON `hash` MORE TIMES THAN `request_preimage`.
Input Parameters
| # | Name | Type | Description |
|---|---|---|---|
| 0 | hash | H256 | hash (H256) |
Permissions
Origin
Unknown
Required Role
Permission data inferred from metadata. May be incomplete.
Requirements
- Preimage is requested
Effects
Storage Modified
Postconditions
- Request removed
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 unrequest_preimage call
const hash = 0 as any /* H256 */;
const call = api.tx[stringCamelCase("Preimage")][stringCamelCase("unrequest_preimage")](
hash
);Runtime Info
- Pallet Index
- 14
- Call Index
- 3
- First Version
- v133
- Current Version
- v393