Call Workflow
This diagram shows the call execution flow: starting with unnote_preimage, passing through validation
(signature, nonce, mortality, fee payment), then pre-dispatch checks, followed by dispatch which emits events: Noted, Cleared and modifies storage: PreimageFor, StatusFor, and finally post-dispatch where ExtrinsicSuccess is emitted and fees are settled.
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Used by: validatorsdevelopers
The Big Picture
Returns deposit for unused preimage.
Use Cases
- Reclaim deposit
From Chain Metadata
Clear an unrequested preimage from the runtime storage. If `len` is provided, then it will be a much cheaper operation. `hash`: The hash of the preimage to be removed from the store. `len`: The length of the preimage of `hash`.
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 exists
- Not requested
- Caller is depositor
Effects
Storage Modified
Postconditions
- Preimage removed
- Deposit returned
Side Effects
- Emits Cleared
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 unnote_preimage call (typed, named args)
const hash = "0x0000000000000000000000000000000000000000000000000000000000000000";
const tx = api.tx.Preimage.unnote_preimage({
hash,
});Runtime Info
- Pallet Index
- 14
- Call Index
- 1
- First Version
- v133
- Current Version
- v411