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 T::Hash | hash: Cryptographic hash (32 bytes) |
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 { 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 unrequest_preimage call (typed, named args)
const hash = "0x0000000000000000000000000000000000000000000000000000000000000000";
const tx = api.tx.Preimage.unrequest_preimage({
hash,
});Runtime Info
- Pallet Index
- 14
- Call Index
- 3
- First Version
- v133
- Current Version
- v411